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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
commitace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch)
treeb2d64bc10158fdd5497876388cd68142ca374ed3 /arch/mips/dec
parentInitial commit. (diff)
downloadlinux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz
linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/mips/dec')
-rw-r--r--arch/mips/dec/Makefile10
-rw-r--r--arch/mips/dec/Platform7
-rw-r--r--arch/mips/dec/ecc-berr.c274
-rw-r--r--arch/mips/dec/int-handler.S311
-rw-r--r--arch/mips/dec/ioasic-irq.c112
-rw-r--r--arch/mips/dec/kn01-berr.c196
-rw-r--r--arch/mips/dec/kn02-irq.c75
-rw-r--r--arch/mips/dec/kn02xa-berr.c135
-rw-r--r--arch/mips/dec/platform.c40
-rw-r--r--arch/mips/dec/prom/Makefile9
-rw-r--r--arch/mips/dec/prom/cmdline.c40
-rw-r--r--arch/mips/dec/prom/console.c41
-rw-r--r--arch/mips/dec/prom/dectypes.h15
-rw-r--r--arch/mips/dec/prom/identify.c187
-rw-r--r--arch/mips/dec/prom/init.c137
-rw-r--r--arch/mips/dec/prom/locore.S30
-rw-r--r--arch/mips/dec/prom/memory.c117
-rw-r--r--arch/mips/dec/reset.c41
-rw-r--r--arch/mips/dec/setup.c784
-rw-r--r--arch/mips/dec/tc.c95
-rw-r--r--arch/mips/dec/time.c172
-rw-r--r--arch/mips/dec/wbflush.c92
22 files changed, 2920 insertions, 0 deletions
diff --git a/arch/mips/dec/Makefile b/arch/mips/dec/Makefile
new file mode 100644
index 0000000000..c9f62f1da3
--- /dev/null
+++ b/arch/mips/dec/Makefile
@@ -0,0 +1,10 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Makefile for the DECstation family specific parts of the kernel
+#
+
+obj-y := ecc-berr.o int-handler.o ioasic-irq.o kn01-berr.o \
+ kn02-irq.o kn02xa-berr.o platform.o reset.o setup.o time.o
+
+obj-$(CONFIG_TC) += tc.o
+obj-$(CONFIG_CPU_HAS_WB) += wbflush.o
diff --git a/arch/mips/dec/Platform b/arch/mips/dec/Platform
new file mode 100644
index 0000000000..c82391e832
--- /dev/null
+++ b/arch/mips/dec/Platform
@@ -0,0 +1,7 @@
+#
+# DECstation family
+#
+cflags-$(CONFIG_MACH_DECSTATION) += \
+ -I$(srctree)/arch/mips/include/asm/mach-dec
+libs-$(CONFIG_MACH_DECSTATION) += arch/mips/dec/prom/
+load-$(CONFIG_MACH_DECSTATION) += 0xffffffff80040000
diff --git a/arch/mips/dec/ecc-berr.c b/arch/mips/dec/ecc-berr.c
new file mode 100644
index 0000000000..1eb356fdd8
--- /dev/null
+++ b/arch/mips/dec/ecc-berr.c
@@ -0,0 +1,274 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Bus error event handling code for systems equipped with ECC
+ * handling logic, i.e. DECstation/DECsystem 5000/200 (KN02),
+ * 5000/240 (KN03), 5000/260 (KN05) and DECsystem 5900 (KN03),
+ * 5900/260 (KN05) systems.
+ *
+ * Copyright (c) 2003, 2005 Maciej W. Rozycki
+ */
+
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/types.h>
+
+#include <asm/addrspace.h>
+#include <asm/bootinfo.h>
+#include <asm/cpu.h>
+#include <asm/cpu-type.h>
+#include <asm/irq_regs.h>
+#include <asm/processor.h>
+#include <asm/ptrace.h>
+#include <asm/traps.h>
+
+#include <asm/dec/ecc.h>
+#include <asm/dec/kn02.h>
+#include <asm/dec/kn03.h>
+#include <asm/dec/kn05.h>
+
+static volatile u32 *kn0x_erraddr;
+static volatile u32 *kn0x_chksyn;
+
+static inline void dec_ecc_be_ack(void)
+{
+ *kn0x_erraddr = 0; /* any write clears the IRQ */
+ iob();
+}
+
+static int dec_ecc_be_backend(struct pt_regs *regs, int is_fixup, int invoker)
+{
+ static const char excstr[] = "exception";
+ static const char intstr[] = "interrupt";
+ static const char cpustr[] = "CPU";
+ static const char dmastr[] = "DMA";
+ static const char readstr[] = "read";
+ static const char mreadstr[] = "memory read";
+ static const char writestr[] = "write";
+ static const char mwritstr[] = "partial memory write";
+ static const char timestr[] = "timeout";
+ static const char overstr[] = "overrun";
+ static const char eccstr[] = "ECC error";
+
+ const char *kind, *agent, *cycle, *event;
+ const char *status = "", *xbit = "", *fmt = "";
+ unsigned long address;
+ u16 syn = 0, sngl;
+
+ int i = 0;
+
+ u32 erraddr = *kn0x_erraddr;
+ u32 chksyn = *kn0x_chksyn;
+ int action = MIPS_BE_FATAL;
+
+ /* For non-ECC ack ASAP, so that any subsequent errors get caught. */
+ if ((erraddr & (KN0X_EAR_VALID | KN0X_EAR_ECCERR)) == KN0X_EAR_VALID)
+ dec_ecc_be_ack();
+
+ kind = invoker ? intstr : excstr;
+
+ if (!(erraddr & KN0X_EAR_VALID)) {
+ /* No idea what happened. */
+ printk(KERN_ALERT "Unidentified bus error %s\n", kind);
+ return action;
+ }
+
+ agent = (erraddr & KN0X_EAR_CPU) ? cpustr : dmastr;
+
+ if (erraddr & KN0X_EAR_ECCERR) {
+ /* An ECC error on a CPU or DMA transaction. */
+ cycle = (erraddr & KN0X_EAR_WRITE) ? mwritstr : mreadstr;
+ event = eccstr;
+ } else {
+ /* A CPU timeout or a DMA overrun. */
+ cycle = (erraddr & KN0X_EAR_WRITE) ? writestr : readstr;
+ event = (erraddr & KN0X_EAR_CPU) ? timestr : overstr;
+ }
+
+ address = erraddr & KN0X_EAR_ADDRESS;
+ /* For ECC errors on reads adjust for MT pipelining. */
+ if ((erraddr & (KN0X_EAR_WRITE | KN0X_EAR_ECCERR)) == KN0X_EAR_ECCERR)
+ address = (address & ~0xfffLL) | ((address - 5) & 0xfffLL);
+ address <<= 2;
+
+ /* Only CPU errors are fixable. */
+ if (erraddr & KN0X_EAR_CPU && is_fixup)
+ action = MIPS_BE_FIXUP;
+
+ if (erraddr & KN0X_EAR_ECCERR) {
+ static const u8 data_sbit[32] = {
+ 0x4f, 0x4a, 0x52, 0x54, 0x57, 0x58, 0x5b, 0x5d,
+ 0x23, 0x25, 0x26, 0x29, 0x2a, 0x2c, 0x31, 0x34,
+ 0x0e, 0x0b, 0x13, 0x15, 0x16, 0x19, 0x1a, 0x1c,
+ 0x62, 0x64, 0x67, 0x68, 0x6b, 0x6d, 0x70, 0x75,
+ };
+ static const u8 data_mbit[25] = {
+ 0x07, 0x0d, 0x1f,
+ 0x2f, 0x32, 0x37, 0x38, 0x3b, 0x3d, 0x3e,
+ 0x43, 0x45, 0x46, 0x49, 0x4c, 0x51, 0x5e,
+ 0x61, 0x6e, 0x73, 0x76, 0x79, 0x7a, 0x7c, 0x7f,
+ };
+ static const char sbestr[] = "corrected single";
+ static const char dbestr[] = "uncorrectable double";
+ static const char mbestr[] = "uncorrectable multiple";
+
+ if (!(address & 0x4))
+ syn = chksyn; /* Low bank. */
+ else
+ syn = chksyn >> 16; /* High bank. */
+
+ if (!(syn & KN0X_ESR_VLDLO)) {
+ /* Ack now, no rewrite will happen. */
+ dec_ecc_be_ack();
+
+ fmt = KERN_ALERT "%s" "invalid\n";
+ } else {
+ sngl = syn & KN0X_ESR_SNGLO;
+ syn &= KN0X_ESR_SYNLO;
+
+ /*
+ * Multibit errors may be tagged incorrectly;
+ * check the syndrome explicitly.
+ */
+ for (i = 0; i < 25; i++)
+ if (syn == data_mbit[i])
+ break;
+
+ if (i < 25) {
+ status = mbestr;
+ } else if (!sngl) {
+ status = dbestr;
+ } else {
+ volatile u32 *ptr =
+ (void *)CKSEG1ADDR(address);
+
+ *ptr = *ptr; /* Rewrite. */
+ iob();
+
+ status = sbestr;
+ action = MIPS_BE_DISCARD;
+ }
+
+ /* Ack now, now we've rewritten (or not). */
+ dec_ecc_be_ack();
+
+ if (syn && syn == (syn & -syn)) {
+ if (syn == 0x01) {
+ fmt = KERN_ALERT "%s"
+ "%#04x -- %s bit error "
+ "at check bit C%s\n";
+ xbit = "X";
+ } else {
+ fmt = KERN_ALERT "%s"
+ "%#04x -- %s bit error "
+ "at check bit C%s%u\n";
+ }
+ i = syn >> 2;
+ } else {
+ for (i = 0; i < 32; i++)
+ if (syn == data_sbit[i])
+ break;
+ if (i < 32)
+ fmt = KERN_ALERT "%s"
+ "%#04x -- %s bit error "
+ "at data bit D%s%u\n";
+ else
+ fmt = KERN_ALERT "%s"
+ "%#04x -- %s bit error\n";
+ }
+ }
+ }
+
+ if (action != MIPS_BE_FIXUP)
+ printk(KERN_ALERT "Bus error %s: %s %s %s at %#010lx\n",
+ kind, agent, cycle, event, address);
+
+ if (action != MIPS_BE_FIXUP && erraddr & KN0X_EAR_ECCERR)
+ printk(fmt, " ECC syndrome ", syn, status, xbit, i);
+
+ return action;
+}
+
+int dec_ecc_be_handler(struct pt_regs *regs, int is_fixup)
+{
+ return dec_ecc_be_backend(regs, is_fixup, 0);
+}
+
+irqreturn_t dec_ecc_be_interrupt(int irq, void *dev_id)
+{
+ struct pt_regs *regs = get_irq_regs();
+
+ int action = dec_ecc_be_backend(regs, 0, 1);
+
+ if (action == MIPS_BE_DISCARD)
+ return IRQ_HANDLED;
+
+ /*
+ * FIXME: Find the affected processes and kill them, otherwise
+ * we must die.
+ *
+ * The interrupt is asynchronously delivered thus EPC and RA
+ * may be irrelevant, but are printed for a reference.
+ */
+ printk(KERN_ALERT "Fatal bus interrupt, epc == %08lx, ra == %08lx\n",
+ regs->cp0_epc, regs->regs[31]);
+ die("Unrecoverable bus error", regs);
+}
+
+
+/*
+ * Initialization differs a bit between KN02 and KN03/KN05, so we
+ * need two variants. Once set up, all systems can be handled the
+ * same way.
+ */
+static inline void dec_kn02_be_init(void)
+{
+ volatile u32 *csr = (void *)CKSEG1ADDR(KN02_SLOT_BASE + KN02_CSR);
+
+ kn0x_erraddr = (void *)CKSEG1ADDR(KN02_SLOT_BASE + KN02_ERRADDR);
+ kn0x_chksyn = (void *)CKSEG1ADDR(KN02_SLOT_BASE + KN02_CHKSYN);
+
+ /* Preset write-only bits of the Control Register cache. */
+ cached_kn02_csr = *csr | KN02_CSR_LEDS;
+
+ /* Set normal ECC detection and generation. */
+ cached_kn02_csr &= ~(KN02_CSR_DIAGCHK | KN02_CSR_DIAGGEN);
+ /* Enable ECC correction. */
+ cached_kn02_csr |= KN02_CSR_CORRECT;
+ *csr = cached_kn02_csr;
+ iob();
+}
+
+static inline void dec_kn03_be_init(void)
+{
+ volatile u32 *mcr = (void *)CKSEG1ADDR(KN03_SLOT_BASE + IOASIC_MCR);
+ volatile u32 *mbcs = (void *)CKSEG1ADDR(KN4K_SLOT_BASE + KN4K_MB_CSR);
+
+ kn0x_erraddr = (void *)CKSEG1ADDR(KN03_SLOT_BASE + IOASIC_ERRADDR);
+ kn0x_chksyn = (void *)CKSEG1ADDR(KN03_SLOT_BASE + IOASIC_CHKSYN);
+
+ /*
+ * Set normal ECC detection and generation, enable ECC correction.
+ * For KN05 we also need to make sure EE (?) is enabled in the MB.
+ * Otherwise DBE/IBE exceptions would be masked but bus error
+ * interrupts would still arrive, resulting in an inevitable crash
+ * if get_dbe() triggers one.
+ */
+ *mcr = (*mcr & ~(KN03_MCR_DIAGCHK | KN03_MCR_DIAGGEN)) |
+ KN03_MCR_CORRECT;
+ if (current_cpu_type() == CPU_R4400SC)
+ *mbcs |= KN4K_MB_CSR_EE;
+ fast_iob();
+}
+
+void __init dec_ecc_be_init(void)
+{
+ if (mips_machtype == MACH_DS5000_200)
+ dec_kn02_be_init();
+ else
+ dec_kn03_be_init();
+
+ /* Clear any leftover errors from the firmware. */
+ dec_ecc_be_ack();
+}
diff --git a/arch/mips/dec/int-handler.S b/arch/mips/dec/int-handler.S
new file mode 100644
index 0000000000..011d1d6788
--- /dev/null
+++ b/arch/mips/dec/int-handler.S
@@ -0,0 +1,311 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 1995, 1996, 1997 Paul M. Antoine and Harald Koerfgen
+ * Copyright (C) 2000, 2001, 2002, 2003, 2005 Maciej W. Rozycki
+ *
+ * Written by Ralf Baechle and Andreas Busse, modified for DECstation
+ * support by Paul Antoine and Harald Koerfgen.
+ *
+ * completely rewritten:
+ * Copyright (C) 1998 Harald Koerfgen
+ *
+ * Rewritten extensively for controller-driven IRQ support
+ * by Maciej W. Rozycki.
+ */
+
+#include <asm/addrspace.h>
+#include <asm/asm.h>
+#include <asm/mipsregs.h>
+#include <asm/regdef.h>
+#include <asm/stackframe.h>
+
+#include <asm/dec/interrupts.h>
+#include <asm/dec/ioasic_addrs.h>
+#include <asm/dec/ioasic_ints.h>
+#include <asm/dec/kn01.h>
+#include <asm/dec/kn02.h>
+#include <asm/dec/kn02xa.h>
+#include <asm/dec/kn03.h>
+
+#define KN02_CSR_BASE CKSEG1ADDR(KN02_SLOT_BASE + KN02_CSR)
+#define KN02XA_IOASIC_BASE CKSEG1ADDR(KN02XA_SLOT_BASE + IOASIC_IOCTL)
+#define KN03_IOASIC_BASE CKSEG1ADDR(KN03_SLOT_BASE + IOASIC_IOCTL)
+
+ .text
+ .set noreorder
+/*
+ * plat_irq_dispatch: Interrupt handler for DECstations
+ *
+ * We follow the model in the Indy interrupt code by David Miller, where he
+ * says: a lot of complication here is taken away because:
+ *
+ * 1) We handle one interrupt and return, sitting in a loop
+ * and moving across all the pending IRQ bits in the cause
+ * register is _NOT_ the answer, the common case is one
+ * pending IRQ so optimize in that direction.
+ *
+ * 2) We need not check against bits in the status register
+ * IRQ mask, that would make this routine slow as hell.
+ *
+ * 3) Linux only thinks in terms of all IRQs on or all IRQs
+ * off, nothing in between like BSD spl() brain-damage.
+ *
+ * Furthermore, the IRQs on the DECstations look basically (barring
+ * software IRQs which we don't use at all) like...
+ *
+ * DS2100/3100's, aka kn01, aka Pmax:
+ *
+ * MIPS IRQ Source
+ * -------- ------
+ * 0 Software (ignored)
+ * 1 Software (ignored)
+ * 2 SCSI
+ * 3 Lance Ethernet
+ * 4 DZ11 serial
+ * 5 RTC
+ * 6 Memory Controller & Video
+ * 7 FPU
+ *
+ * DS5000/200, aka kn02, aka 3max:
+ *
+ * MIPS IRQ Source
+ * -------- ------
+ * 0 Software (ignored)
+ * 1 Software (ignored)
+ * 2 TurboChannel
+ * 3 RTC
+ * 4 Reserved
+ * 5 Memory Controller
+ * 6 Reserved
+ * 7 FPU
+ *
+ * DS5000/1xx's, aka kn02ba, aka 3min:
+ *
+ * MIPS IRQ Source
+ * -------- ------
+ * 0 Software (ignored)
+ * 1 Software (ignored)
+ * 2 TurboChannel Slot 0
+ * 3 TurboChannel Slot 1
+ * 4 TurboChannel Slot 2
+ * 5 TurboChannel Slot 3 (ASIC)
+ * 6 Halt button
+ * 7 FPU/R4k timer
+ *
+ * DS5000/2x's, aka kn02ca, aka maxine:
+ *
+ * MIPS IRQ Source
+ * -------- ------
+ * 0 Software (ignored)
+ * 1 Software (ignored)
+ * 2 Periodic Interrupt (100usec)
+ * 3 RTC
+ * 4 I/O write timeout
+ * 5 TurboChannel (ASIC)
+ * 6 Halt Keycode from Access.Bus keyboard (CTRL-ALT-ENTER)
+ * 7 FPU/R4k timer
+ *
+ * DS5000/2xx's, aka kn03, aka 3maxplus:
+ *
+ * MIPS IRQ Source
+ * -------- ------
+ * 0 Software (ignored)
+ * 1 Software (ignored)
+ * 2 System Board (ASIC)
+ * 3 RTC
+ * 4 Reserved
+ * 5 Memory
+ * 6 Halt Button
+ * 7 FPU/R4k timer
+ *
+ * We handle the IRQ according to _our_ priority (see setup.c),
+ * then we just return. If multiple IRQs are pending then we will
+ * just take another exception, big deal.
+ */
+ .align 5
+ NESTED(plat_irq_dispatch, PT_SIZE, ra)
+ .set noreorder
+
+ /*
+ * Get pending Interrupts
+ */
+ mfc0 t0,CP0_CAUSE # get pending interrupts
+ mfc0 t1,CP0_STATUS
+#if defined(CONFIG_32BIT) && defined(CONFIG_MIPS_FP_SUPPORT)
+ lw t2,cpu_fpu_mask
+#endif
+ andi t0,ST0_IM # CAUSE.CE may be non-zero!
+ and t0,t1 # isolate allowed ones
+
+ beqz t0,spurious
+
+#if defined(CONFIG_32BIT) && defined(CONFIG_MIPS_FP_SUPPORT)
+ and t2,t0
+ bnez t2,fpu # handle FPU immediately
+#endif
+
+ /*
+ * Find irq with highest priority
+ */
+ # open coded PTR_LA t1, cpu_mask_nr_tbl
+#if defined(CONFIG_32BIT) || defined(KBUILD_64BIT_SYM32)
+ # open coded la t1, cpu_mask_nr_tbl
+ lui t1, %hi(cpu_mask_nr_tbl)
+ addiu t1, %lo(cpu_mask_nr_tbl)
+#else
+#error GCC `-msym32' option required for 64-bit DECstation builds
+#endif
+1: lw t2,(t1)
+ nop
+ and t2,t0
+ beqz t2,1b
+ addu t1,2*PTRSIZE # delay slot
+
+ /*
+ * Do the low-level stuff
+ */
+ lw a0,(-PTRSIZE)(t1)
+ nop
+ bgez a0,handle_it # irq_nr >= 0?
+ # irq_nr < 0: it is an address
+ nop
+ jr a0
+ # a trick to save a branch:
+ lui t2,(KN03_IOASIC_BASE>>16)&0xffff
+ # upper part of IOASIC Address
+
+/*
+ * Handle "IRQ Controller" Interrupts
+ * Masked Interrupts are still visible and have to be masked "by hand".
+ */
+ FEXPORT(kn02_io_int) # 3max
+ lui t0,(KN02_CSR_BASE>>16)&0xffff
+ # get interrupt status and mask
+ lw t0,(t0)
+ nop
+ andi t1,t0,KN02_IRQ_ALL
+ b 1f
+ srl t0,16 # shift interrupt mask
+
+ FEXPORT(kn02xa_io_int) # 3min/maxine
+ lui t2,(KN02XA_IOASIC_BASE>>16)&0xffff
+ # upper part of IOASIC Address
+
+ FEXPORT(kn03_io_int) # 3max+ (t2 loaded earlier)
+ lw t0,IO_REG_SIR(t2) # get status: IOASIC sir
+ lw t1,IO_REG_SIMR(t2) # get mask: IOASIC simr
+ nop
+
+1: and t0,t1 # mask out allowed ones
+
+ beqz t0,spurious
+
+ /*
+ * Find irq with highest priority
+ */
+ # open coded PTR_LA t1,asic_mask_nr_tbl
+#if defined(CONFIG_32BIT) || defined(KBUILD_64BIT_SYM32)
+ # open coded la t1, asic_mask_nr_tbl
+ lui t1, %hi(asic_mask_nr_tbl)
+ addiu t1, %lo(asic_mask_nr_tbl)
+#else
+#error GCC `-msym32' option required for 64-bit DECstation builds
+#endif
+2: lw t2,(t1)
+ nop
+ and t2,t0
+ beq zero,t2,2b
+ addu t1,2*PTRSIZE # delay slot
+
+ /*
+ * Do the low-level stuff
+ */
+ lw a0,%lo(-PTRSIZE)(t1)
+ nop
+ bgez a0,handle_it # irq_nr >= 0?
+ # irq_nr < 0: it is an address
+ nop
+ jr a0
+ nop # delay slot
+
+/*
+ * Dispatch low-priority interrupts. We reconsider all status
+ * bits again, which looks like a lose, but it makes the code
+ * simple and O(log n), so it gets compensated.
+ */
+ FEXPORT(cpu_all_int) # HALT, timers, software junk
+ li a0,DEC_CPU_IRQ_BASE
+ srl t0,CAUSEB_IP
+ li t1,CAUSEF_IP>>CAUSEB_IP # mask
+ b 1f
+ li t2,4 # nr of bits / 2
+
+ FEXPORT(kn02_all_int) # impossible ?
+ li a0,KN02_IRQ_BASE
+ li t1,KN02_IRQ_ALL # mask
+ b 1f
+ li t2,4 # nr of bits / 2
+
+ FEXPORT(asic_all_int) # various I/O ASIC junk
+ li a0,IO_IRQ_BASE
+ li t1,IO_IRQ_ALL # mask
+ b 1f
+ li t2,8 # nr of bits / 2
+
+/*
+ * Dispatch DMA interrupts -- O(log n).
+ */
+ FEXPORT(asic_dma_int) # I/O ASIC DMA events
+ li a0,IO_IRQ_BASE+IO_INR_DMA
+ srl t0,IO_INR_DMA
+ li t1,IO_IRQ_DMA>>IO_INR_DMA # mask
+ li t2,8 # nr of bits / 2
+
+ /*
+ * Find irq with highest priority.
+ * Highest irq number takes precedence.
+ */
+1: srlv t3,t1,t2
+2: xor t1,t3
+ and t3,t0,t1
+ beqz t3,3f
+ nop
+ move t0,t3
+ addu a0,t2
+3: srl t2,1
+ bnez t2,2b
+ srlv t3,t1,t2
+
+handle_it:
+ j dec_irq_dispatch
+ nop
+
+#if defined(CONFIG_32BIT) && defined(CONFIG_MIPS_FP_SUPPORT)
+fpu:
+ lw t0,fpu_kstat_irq
+ nop
+ lw t1,(t0)
+ nop
+ addu t1,1
+ j handle_fpe_int
+ sw t1,(t0)
+#endif
+
+spurious:
+ j spurious_interrupt
+ nop
+ END(plat_irq_dispatch)
+
+/*
+ * Generic unimplemented interrupt routines -- cpu_mask_nr_tbl
+ * and asic_mask_nr_tbl are initialized to point all interrupts here.
+ * The tables are then filled in by machine-specific initialisation
+ * in dec_setup().
+ */
+ FEXPORT(dec_intr_unimplemented)
+ move a1,t0 # cheats way of printing an arg!
+ ASM_PANIC("Unimplemented cpu interrupt! CP0_CAUSE: 0x%08x");
+
+ FEXPORT(asic_intr_unimplemented)
+ move a1,t0 # cheats way of printing an arg!
+ ASM_PANIC("Unimplemented asic interrupt! ASIC ISR: 0x%08x");
diff --git a/arch/mips/dec/ioasic-irq.c b/arch/mips/dec/ioasic-irq.c
new file mode 100644
index 0000000000..971f7b4675
--- /dev/null
+++ b/arch/mips/dec/ioasic-irq.c
@@ -0,0 +1,112 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * DEC I/O ASIC interrupts.
+ *
+ * Copyright (c) 2002, 2003, 2013 Maciej W. Rozycki
+ */
+
+#include <linux/init.h>
+#include <linux/irq.h>
+#include <linux/types.h>
+
+#include <asm/dec/ioasic.h>
+#include <asm/dec/ioasic_addrs.h>
+#include <asm/dec/ioasic_ints.h>
+
+static int ioasic_irq_base;
+
+static void unmask_ioasic_irq(struct irq_data *d)
+{
+ u32 simr;
+
+ simr = ioasic_read(IO_REG_SIMR);
+ simr |= (1 << (d->irq - ioasic_irq_base));
+ ioasic_write(IO_REG_SIMR, simr);
+}
+
+static void mask_ioasic_irq(struct irq_data *d)
+{
+ u32 simr;
+
+ simr = ioasic_read(IO_REG_SIMR);
+ simr &= ~(1 << (d->irq - ioasic_irq_base));
+ ioasic_write(IO_REG_SIMR, simr);
+}
+
+static void ack_ioasic_irq(struct irq_data *d)
+{
+ mask_ioasic_irq(d);
+ fast_iob();
+}
+
+static struct irq_chip ioasic_irq_type = {
+ .name = "IO-ASIC",
+ .irq_ack = ack_ioasic_irq,
+ .irq_mask = mask_ioasic_irq,
+ .irq_mask_ack = ack_ioasic_irq,
+ .irq_unmask = unmask_ioasic_irq,
+};
+
+static void clear_ioasic_dma_irq(struct irq_data *d)
+{
+ u32 sir;
+
+ sir = ~(1 << (d->irq - ioasic_irq_base));
+ ioasic_write(IO_REG_SIR, sir);
+ fast_iob();
+}
+
+static struct irq_chip ioasic_dma_irq_type = {
+ .name = "IO-ASIC-DMA",
+ .irq_ack = clear_ioasic_dma_irq,
+ .irq_mask = mask_ioasic_irq,
+ .irq_unmask = unmask_ioasic_irq,
+ .irq_eoi = clear_ioasic_dma_irq,
+};
+
+/*
+ * I/O ASIC implements two kinds of DMA interrupts, informational and
+ * error interrupts.
+ *
+ * The former do not stop DMA and should be cleared as soon as possible
+ * so that if they retrigger before the handler has completed, usually as
+ * a side effect of actions taken by the handler, then they are reissued.
+ * These use the `handle_edge_irq' handler that clears the request right
+ * away.
+ *
+ * The latter stop DMA and do not resume it until the interrupt has been
+ * cleared. This cannot be done until after a corrective action has been
+ * taken and this also means they will not retrigger. Therefore they use
+ * the `handle_fasteoi_irq' handler that only clears the request on the
+ * way out. Because MIPS processor interrupt inputs, one of which the I/O
+ * ASIC is cascaded to, are level-triggered it is recommended that error
+ * DMA interrupt action handlers are registered with the IRQF_ONESHOT flag
+ * set so that they are run with the interrupt line masked.
+ *
+ * This mask has `1' bits in the positions of informational interrupts.
+ */
+#define IO_IRQ_DMA_INFO \
+ (IO_IRQ_MASK(IO_INR_SCC0A_RXDMA) | \
+ IO_IRQ_MASK(IO_INR_SCC1A_RXDMA) | \
+ IO_IRQ_MASK(IO_INR_ISDN_TXDMA) | \
+ IO_IRQ_MASK(IO_INR_ISDN_RXDMA) | \
+ IO_IRQ_MASK(IO_INR_ASC_DMA))
+
+void __init init_ioasic_irqs(int base)
+{
+ int i;
+
+ /* Mask interrupts. */
+ ioasic_write(IO_REG_SIMR, 0);
+ fast_iob();
+
+ for (i = base; i < base + IO_INR_DMA; i++)
+ irq_set_chip_and_handler(i, &ioasic_irq_type,
+ handle_level_irq);
+ for (; i < base + IO_IRQ_LINES; i++)
+ irq_set_chip_and_handler(i, &ioasic_dma_irq_type,
+ 1 << (i - base) & IO_IRQ_DMA_INFO ?
+ handle_edge_irq : handle_fasteoi_irq);
+
+ ioasic_irq_base = base;
+}
diff --git a/arch/mips/dec/kn01-berr.c b/arch/mips/dec/kn01-berr.c
new file mode 100644
index 0000000000..76efed7bc9
--- /dev/null
+++ b/arch/mips/dec/kn01-berr.c
@@ -0,0 +1,196 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Bus error event handling code for DECstation/DECsystem 3100
+ * and 2100 (KN01) systems equipped with parity error detection
+ * logic.
+ *
+ * Copyright (c) 2005 Maciej W. Rozycki
+ */
+
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/spinlock.h>
+#include <linux/types.h>
+
+#include <asm/inst.h>
+#include <asm/irq_regs.h>
+#include <asm/mipsregs.h>
+#include <asm/page.h>
+#include <asm/ptrace.h>
+#include <asm/traps.h>
+#include <linux/uaccess.h>
+
+#include <asm/dec/kn01.h>
+
+
+/* CP0 hazard avoidance. */
+#define BARRIER \
+ __asm__ __volatile__( \
+ ".set push\n\t" \
+ ".set noreorder\n\t" \
+ "nop\n\t" \
+ ".set pop\n\t")
+
+/*
+ * Bits 7:0 of the Control Register are write-only -- the
+ * corresponding bits of the Status Register have a different
+ * meaning. Hence we use a cache. It speeds up things a bit
+ * as well.
+ *
+ * There is no default value -- it has to be initialized.
+ */
+u16 cached_kn01_csr;
+static DEFINE_RAW_SPINLOCK(kn01_lock);
+
+
+static inline void dec_kn01_be_ack(void)
+{
+ volatile u16 *csr = (void *)CKSEG1ADDR(KN01_SLOT_BASE + KN01_CSR);
+ unsigned long flags;
+
+ raw_spin_lock_irqsave(&kn01_lock, flags);
+
+ *csr = cached_kn01_csr | KN01_CSR_MEMERR; /* Clear bus IRQ. */
+ iob();
+
+ raw_spin_unlock_irqrestore(&kn01_lock, flags);
+}
+
+static int dec_kn01_be_backend(struct pt_regs *regs, int is_fixup, int invoker)
+{
+ volatile u32 *kn01_erraddr = (void *)CKSEG1ADDR(KN01_SLOT_BASE +
+ KN01_ERRADDR);
+
+ static const char excstr[] = "exception";
+ static const char intstr[] = "interrupt";
+ static const char cpustr[] = "CPU";
+ static const char mreadstr[] = "memory read";
+ static const char readstr[] = "read";
+ static const char writestr[] = "write";
+ static const char timestr[] = "timeout";
+ static const char paritystr[] = "parity error";
+
+ int data = regs->cp0_cause & 4;
+ unsigned int __user *pc = (unsigned int __user *)regs->cp0_epc +
+ ((regs->cp0_cause & CAUSEF_BD) != 0);
+ union mips_instruction insn;
+ unsigned long entrylo, offset;
+ long asid, entryhi, vaddr;
+
+ const char *kind, *agent, *cycle, *event;
+ unsigned long address;
+
+ u32 erraddr = *kn01_erraddr;
+ int action = MIPS_BE_FATAL;
+
+ /* Ack ASAP, so that any subsequent errors get caught. */
+ dec_kn01_be_ack();
+
+ kind = invoker ? intstr : excstr;
+
+ agent = cpustr;
+
+ if (invoker)
+ address = erraddr;
+ else {
+ /* Bloody hardware doesn't record the address for reads... */
+ if (data) {
+ /* This never faults. */
+ __get_user(insn.word, pc);
+ vaddr = regs->regs[insn.i_format.rs] +
+ insn.i_format.simmediate;
+ } else
+ vaddr = (long)pc;
+ if (KSEGX(vaddr) == CKSEG0 || KSEGX(vaddr) == CKSEG1)
+ address = CPHYSADDR(vaddr);
+ else {
+ /* Peek at what physical address the CPU used. */
+ asid = read_c0_entryhi();
+ entryhi = asid & (PAGE_SIZE - 1);
+ entryhi |= vaddr & ~(PAGE_SIZE - 1);
+ write_c0_entryhi(entryhi);
+ BARRIER;
+ tlb_probe();
+ /* No need to check for presence. */
+ tlb_read();
+ entrylo = read_c0_entrylo0();
+ write_c0_entryhi(asid);
+ offset = vaddr & (PAGE_SIZE - 1);
+ address = (entrylo & ~(PAGE_SIZE - 1)) | offset;
+ }
+ }
+
+ /* Treat low 256MB as memory, high -- as I/O. */
+ if (address < 0x10000000) {
+ cycle = mreadstr;
+ event = paritystr;
+ } else {
+ cycle = invoker ? writestr : readstr;
+ event = timestr;
+ }
+
+ if (is_fixup)
+ action = MIPS_BE_FIXUP;
+
+ if (action != MIPS_BE_FIXUP)
+ printk(KERN_ALERT "Bus error %s: %s %s %s at %#010lx\n",
+ kind, agent, cycle, event, address);
+
+ return action;
+}
+
+int dec_kn01_be_handler(struct pt_regs *regs, int is_fixup)
+{
+ return dec_kn01_be_backend(regs, is_fixup, 0);
+}
+
+irqreturn_t dec_kn01_be_interrupt(int irq, void *dev_id)
+{
+ volatile u16 *csr = (void *)CKSEG1ADDR(KN01_SLOT_BASE + KN01_CSR);
+ struct pt_regs *regs = get_irq_regs();
+ int action;
+
+ if (!(*csr & KN01_CSR_MEMERR))
+ return IRQ_NONE; /* Must have been video. */
+
+ action = dec_kn01_be_backend(regs, 0, 1);
+
+ if (action == MIPS_BE_DISCARD)
+ return IRQ_HANDLED;
+
+ /*
+ * FIXME: Find the affected processes and kill them, otherwise
+ * we must die.
+ *
+ * The interrupt is asynchronously delivered thus EPC and RA
+ * may be irrelevant, but are printed for a reference.
+ */
+ printk(KERN_ALERT "Fatal bus interrupt, epc == %08lx, ra == %08lx\n",
+ regs->cp0_epc, regs->regs[31]);
+ die("Unrecoverable bus error", regs);
+}
+
+
+void __init dec_kn01_be_init(void)
+{
+ volatile u16 *csr = (void *)CKSEG1ADDR(KN01_SLOT_BASE + KN01_CSR);
+ unsigned long flags;
+
+ raw_spin_lock_irqsave(&kn01_lock, flags);
+
+ /* Preset write-only bits of the Control Register cache. */
+ cached_kn01_csr = *csr;
+ cached_kn01_csr &= KN01_CSR_STATUS | KN01_CSR_PARDIS | KN01_CSR_TXDIS;
+ cached_kn01_csr |= KN01_CSR_LEDS;
+
+ /* Enable parity error detection. */
+ cached_kn01_csr &= ~KN01_CSR_PARDIS;
+ *csr = cached_kn01_csr;
+ iob();
+
+ raw_spin_unlock_irqrestore(&kn01_lock, flags);
+
+ /* Clear any leftover errors from the firmware. */
+ dec_kn01_be_ack();
+}
diff --git a/arch/mips/dec/kn02-irq.c b/arch/mips/dec/kn02-irq.c
new file mode 100644
index 0000000000..7e18de5743
--- /dev/null
+++ b/arch/mips/dec/kn02-irq.c
@@ -0,0 +1,75 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * DECstation 5000/200 (KN02) Control and Status Register
+ * interrupts.
+ *
+ * Copyright (c) 2002, 2003, 2005 Maciej W. Rozycki
+ */
+
+#include <linux/init.h>
+#include <linux/irq.h>
+#include <linux/types.h>
+
+#include <asm/dec/kn02.h>
+
+
+/*
+ * Bits 7:0 of the Control Register are write-only -- the
+ * corresponding bits of the Status Register have a different
+ * meaning. Hence we use a cache. It speeds up things a bit
+ * as well.
+ *
+ * There is no default value -- it has to be initialized.
+ */
+u32 cached_kn02_csr;
+
+static int kn02_irq_base;
+
+static void unmask_kn02_irq(struct irq_data *d)
+{
+ volatile u32 *csr = (volatile u32 *)CKSEG1ADDR(KN02_SLOT_BASE +
+ KN02_CSR);
+
+ cached_kn02_csr |= (1 << (d->irq - kn02_irq_base + 16));
+ *csr = cached_kn02_csr;
+}
+
+static void mask_kn02_irq(struct irq_data *d)
+{
+ volatile u32 *csr = (volatile u32 *)CKSEG1ADDR(KN02_SLOT_BASE +
+ KN02_CSR);
+
+ cached_kn02_csr &= ~(1 << (d->irq - kn02_irq_base + 16));
+ *csr = cached_kn02_csr;
+}
+
+static void ack_kn02_irq(struct irq_data *d)
+{
+ mask_kn02_irq(d);
+ iob();
+}
+
+static struct irq_chip kn02_irq_type = {
+ .name = "KN02-CSR",
+ .irq_ack = ack_kn02_irq,
+ .irq_mask = mask_kn02_irq,
+ .irq_mask_ack = ack_kn02_irq,
+ .irq_unmask = unmask_kn02_irq,
+};
+
+void __init init_kn02_irqs(int base)
+{
+ volatile u32 *csr = (volatile u32 *)CKSEG1ADDR(KN02_SLOT_BASE +
+ KN02_CSR);
+ int i;
+
+ /* Mask interrupts. */
+ cached_kn02_csr &= ~KN02_CSR_IOINTEN;
+ *csr = cached_kn02_csr;
+ iob();
+
+ for (i = base; i < base + KN02_IRQ_LINES; i++)
+ irq_set_chip_and_handler(i, &kn02_irq_type, handle_level_irq);
+
+ kn02_irq_base = base;
+}
diff --git a/arch/mips/dec/kn02xa-berr.c b/arch/mips/dec/kn02xa-berr.c
new file mode 100644
index 0000000000..9699fc4e6e
--- /dev/null
+++ b/arch/mips/dec/kn02xa-berr.c
@@ -0,0 +1,135 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Bus error event handling code for 5000-series systems equipped
+ * with parity error detection logic, i.e. DECstation/DECsystem
+ * 5000/120, /125, /133 (KN02-BA), 5000/150 (KN04-BA) and Personal
+ * DECstation/DECsystem 5000/20, /25, /33 (KN02-CA), 5000/50
+ * (KN04-CA) systems.
+ *
+ * Copyright (c) 2005 Maciej W. Rozycki
+ */
+
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+
+#include <asm/addrspace.h>
+#include <asm/cpu-type.h>
+#include <asm/irq_regs.h>
+#include <asm/ptrace.h>
+#include <asm/traps.h>
+
+#include <asm/dec/kn02ca.h>
+#include <asm/dec/kn02xa.h>
+#include <asm/dec/kn05.h>
+
+static inline void dec_kn02xa_be_ack(void)
+{
+ volatile u32 *mer = (void *)CKSEG1ADDR(KN02XA_MER);
+ volatile u32 *mem_intr = (void *)CKSEG1ADDR(KN02XA_MEM_INTR);
+
+ *mer = KN02CA_MER_INTR; /* Clear errors; keep the ARC IRQ. */
+ *mem_intr = 0; /* Any write clears the bus IRQ. */
+ iob();
+}
+
+static int dec_kn02xa_be_backend(struct pt_regs *regs, int is_fixup,
+ int invoker)
+{
+ volatile u32 *kn02xa_mer = (void *)CKSEG1ADDR(KN02XA_MER);
+ volatile u32 *kn02xa_ear = (void *)CKSEG1ADDR(KN02XA_EAR);
+
+ static const char excstr[] = "exception";
+ static const char intstr[] = "interrupt";
+ static const char cpustr[] = "CPU";
+ static const char mreadstr[] = "memory read";
+ static const char readstr[] = "read";
+ static const char writestr[] = "write";
+ static const char timestr[] = "timeout";
+ static const char paritystr[] = "parity error";
+ static const char lanestat[][4] = { " OK", "BAD" };
+
+ const char *kind, *agent, *cycle, *event;
+ unsigned long address;
+
+ u32 mer = *kn02xa_mer;
+ u32 ear = *kn02xa_ear;
+ int action = MIPS_BE_FATAL;
+
+ /* Ack ASAP, so that any subsequent errors get caught. */
+ dec_kn02xa_be_ack();
+
+ kind = invoker ? intstr : excstr;
+
+ /* No DMA errors? */
+ agent = cpustr;
+
+ address = ear & KN02XA_EAR_ADDRESS;
+
+ /* Low 256MB is decoded as memory, high -- as TC. */
+ if (address < 0x10000000) {
+ cycle = mreadstr;
+ event = paritystr;
+ } else {
+ cycle = invoker ? writestr : readstr;
+ event = timestr;
+ }
+
+ if (is_fixup)
+ action = MIPS_BE_FIXUP;
+
+ if (action != MIPS_BE_FIXUP)
+ printk(KERN_ALERT "Bus error %s: %s %s %s at %#010lx\n",
+ kind, agent, cycle, event, address);
+
+ if (action != MIPS_BE_FIXUP && address < 0x10000000)
+ printk(KERN_ALERT " Byte lane status %#3x -- "
+ "#3: %s, #2: %s, #1: %s, #0: %s\n",
+ (mer & KN02XA_MER_BYTERR) >> 8,
+ lanestat[(mer & KN02XA_MER_BYTERR_3) != 0],
+ lanestat[(mer & KN02XA_MER_BYTERR_2) != 0],
+ lanestat[(mer & KN02XA_MER_BYTERR_1) != 0],
+ lanestat[(mer & KN02XA_MER_BYTERR_0) != 0]);
+
+ return action;
+}
+
+int dec_kn02xa_be_handler(struct pt_regs *regs, int is_fixup)
+{
+ return dec_kn02xa_be_backend(regs, is_fixup, 0);
+}
+
+irqreturn_t dec_kn02xa_be_interrupt(int irq, void *dev_id)
+{
+ struct pt_regs *regs = get_irq_regs();
+ int action = dec_kn02xa_be_backend(regs, 0, 1);
+
+ if (action == MIPS_BE_DISCARD)
+ return IRQ_HANDLED;
+
+ /*
+ * FIXME: Find the affected processes and kill them, otherwise
+ * we must die.
+ *
+ * The interrupt is asynchronously delivered thus EPC and RA
+ * may be irrelevant, but are printed for a reference.
+ */
+ printk(KERN_ALERT "Fatal bus interrupt, epc == %08lx, ra == %08lx\n",
+ regs->cp0_epc, regs->regs[31]);
+ die("Unrecoverable bus error", regs);
+}
+
+
+void __init dec_kn02xa_be_init(void)
+{
+ volatile u32 *mbcs = (void *)CKSEG1ADDR(KN4K_SLOT_BASE + KN4K_MB_CSR);
+
+ /* For KN04 we need to make sure EE (?) is enabled in the MB. */
+ if (current_cpu_type() == CPU_R4000SC)
+ *mbcs |= KN4K_MB_CSR_EE;
+ fast_iob();
+
+ /* Clear any leftover errors from the firmware. */
+ dec_kn02xa_be_ack();
+}
diff --git a/arch/mips/dec/platform.c b/arch/mips/dec/platform.c
new file mode 100644
index 0000000000..c4fcb8c58e
--- /dev/null
+++ b/arch/mips/dec/platform.c
@@ -0,0 +1,40 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * DEC platform devices.
+ *
+ * Copyright (c) 2014 Maciej W. Rozycki
+ */
+
+#include <linux/ioport.h>
+#include <linux/kernel.h>
+#include <linux/mc146818rtc.h>
+#include <linux/platform_device.h>
+
+static struct resource dec_rtc_resources[] = {
+ {
+ .name = "rtc",
+ .flags = IORESOURCE_MEM,
+ },
+};
+
+static struct cmos_rtc_board_info dec_rtc_info = {
+ .flags = CMOS_RTC_FLAGS_NOFREQ,
+ .address_space = 64,
+};
+
+static struct platform_device dec_rtc_device = {
+ .name = "rtc_cmos",
+ .id = PLATFORM_DEVID_NONE,
+ .dev.platform_data = &dec_rtc_info,
+ .resource = dec_rtc_resources,
+ .num_resources = ARRAY_SIZE(dec_rtc_resources),
+};
+
+static int __init dec_add_devices(void)
+{
+ dec_rtc_resources[0].start = RTC_PORT(0);
+ dec_rtc_resources[0].end = RTC_PORT(0) + dec_kn_slot_size - 1;
+ return platform_device_register(&dec_rtc_device);
+}
+
+device_initcall(dec_add_devices);
diff --git a/arch/mips/dec/prom/Makefile b/arch/mips/dec/prom/Makefile
new file mode 100644
index 0000000000..2bad875512
--- /dev/null
+++ b/arch/mips/dec/prom/Makefile
@@ -0,0 +1,9 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Makefile for the DECstation prom monitor library routines
+# under Linux.
+#
+
+lib-y += init.o memory.o cmdline.o identify.o console.o
+
+lib-$(CONFIG_CPU_R3000) += locore.o
diff --git a/arch/mips/dec/prom/cmdline.c b/arch/mips/dec/prom/cmdline.c
new file mode 100644
index 0000000000..3ed63280ae
--- /dev/null
+++ b/arch/mips/dec/prom/cmdline.c
@@ -0,0 +1,40 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * cmdline.c: read the command line passed to us by the PROM.
+ *
+ * Copyright (C) 1998 Harald Koerfgen
+ * Copyright (C) 2002, 2004 Maciej W. Rozycki
+ */
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/types.h>
+
+#include <asm/bootinfo.h>
+#include <asm/dec/prom.h>
+
+#undef PROM_DEBUG
+
+void __init prom_init_cmdline(s32 argc, s32 *argv, u32 magic)
+{
+ char *arg;
+ int start_arg, i;
+
+ /*
+ * collect args and prepare cmd_line
+ */
+ if (!prom_is_rex(magic))
+ start_arg = 1;
+ else
+ start_arg = 2;
+ for (i = start_arg; i < argc; i++) {
+ arg = (void *)(long)(argv[i]);
+ strcat(arcs_cmdline, arg);
+ if (i < (argc - 1))
+ strcat(arcs_cmdline, " ");
+ }
+
+#ifdef PROM_DEBUG
+ printk("arcs_cmdline: %s\n", &(arcs_cmdline[0]));
+#endif
+}
diff --git a/arch/mips/dec/prom/console.c b/arch/mips/dec/prom/console.c
new file mode 100644
index 0000000000..31a8441d84
--- /dev/null
+++ b/arch/mips/dec/prom/console.c
@@ -0,0 +1,41 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * DECstation PROM-based early console support.
+ *
+ * Copyright (C) 2004, 2007 Maciej W. Rozycki
+ */
+#include <linux/console.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+
+#include <asm/dec/prom.h>
+
+static void __init prom_console_write(struct console *con, const char *s,
+ unsigned int c)
+{
+ char buf[81];
+ unsigned int chunk = sizeof(buf) - 1;
+
+ while (c > 0) {
+ if (chunk > c)
+ chunk = c;
+ memcpy(buf, s, chunk);
+ buf[chunk] = '\0';
+ prom_printf("%s", buf);
+ s += chunk;
+ c -= chunk;
+ }
+}
+
+static struct console promcons __initdata = {
+ .name = "prom",
+ .write = prom_console_write,
+ .flags = CON_BOOT | CON_PRINTBUFFER,
+ .index = -1,
+};
+
+void __init register_prom_console(void)
+{
+ register_console(&promcons);
+}
diff --git a/arch/mips/dec/prom/dectypes.h b/arch/mips/dec/prom/dectypes.h
new file mode 100644
index 0000000000..9fcbcc7cdb
--- /dev/null
+++ b/arch/mips/dec/prom/dectypes.h
@@ -0,0 +1,15 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef DECTYPES
+#define DECTYPES
+
+#define DS2100_3100 1 /* DS2100/3100 Pmax */
+#define DS5000_200 2 /* DS5000/200 3max */
+#define DS5000_1XX 3 /* DS5000/1xx kmin */
+#define DS5000_2X0 4 /* DS5000/2x0 3max+ */
+#define DS5800 5 /* DS5800 Isis */
+#define DS5400 6 /* DS5400 MIPSfair */
+#define DS5000_XX 7 /* DS5000/xx maxine */
+#define DS5500 11 /* DS5500 MIPSfair-2 */
+#define DS5100 12 /* DS5100 MIPSmate */
+
+#endif
diff --git a/arch/mips/dec/prom/identify.c b/arch/mips/dec/prom/identify.c
new file mode 100644
index 0000000000..80cd14cd1a
--- /dev/null
+++ b/arch/mips/dec/prom/identify.c
@@ -0,0 +1,187 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * identify.c: machine identification code.
+ *
+ * Copyright (C) 1998 Harald Koerfgen and Paul M. Antoine
+ * Copyright (C) 2002, 2003, 2004, 2005 Maciej W. Rozycki
+ */
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/mc146818rtc.h>
+#include <linux/export.h>
+#include <linux/string.h>
+#include <linux/types.h>
+
+#include <asm/bootinfo.h>
+
+#include <asm/dec/ioasic.h>
+#include <asm/dec/ioasic_addrs.h>
+#include <asm/dec/kn01.h>
+#include <asm/dec/kn02.h>
+#include <asm/dec/kn02ba.h>
+#include <asm/dec/kn02ca.h>
+#include <asm/dec/kn03.h>
+#include <asm/dec/kn230.h>
+#include <asm/dec/prom.h>
+#include <asm/dec/system.h>
+
+#include "dectypes.h"
+
+static const char *dec_system_strings[] = {
+ [MACH_DSUNKNOWN] "unknown DECstation",
+ [MACH_DS23100] "DECstation 2100/3100",
+ [MACH_DS5100] "DECsystem 5100",
+ [MACH_DS5000_200] "DECstation 5000/200",
+ [MACH_DS5000_1XX] "DECstation 5000/1xx",
+ [MACH_DS5000_XX] "Personal DECstation 5000/xx",
+ [MACH_DS5000_2X0] "DECstation 5000/2x0",
+ [MACH_DS5400] "DECsystem 5400",
+ [MACH_DS5500] "DECsystem 5500",
+ [MACH_DS5800] "DECsystem 5800",
+ [MACH_DS5900] "DECsystem 5900",
+};
+
+const char *get_system_type(void)
+{
+#define STR_BUF_LEN 64
+ static char system[STR_BUF_LEN];
+ static int called = 0;
+
+ if (called == 0) {
+ called = 1;
+ snprintf(system, STR_BUF_LEN, "Digital %s",
+ dec_system_strings[mips_machtype]);
+ }
+
+ return system;
+}
+
+
+/*
+ * Setup essential system-specific memory addresses. We need them
+ * early. Semantically the functions belong to prom/init.c, but they
+ * are compact enough we want them inlined. --macro
+ */
+volatile u8 *dec_rtc_base;
+
+EXPORT_SYMBOL(dec_rtc_base);
+
+static inline void prom_init_kn01(void)
+{
+ dec_kn_slot_base = KN01_SLOT_BASE;
+ dec_kn_slot_size = KN01_SLOT_SIZE;
+
+ dec_rtc_base = (void *)CKSEG1ADDR(dec_kn_slot_base + KN01_RTC);
+}
+
+static inline void prom_init_kn230(void)
+{
+ dec_kn_slot_base = KN01_SLOT_BASE;
+ dec_kn_slot_size = KN01_SLOT_SIZE;
+
+ dec_rtc_base = (void *)CKSEG1ADDR(dec_kn_slot_base + KN01_RTC);
+}
+
+static inline void prom_init_kn02(void)
+{
+ dec_kn_slot_base = KN02_SLOT_BASE;
+ dec_kn_slot_size = KN02_SLOT_SIZE;
+ dec_tc_bus = 1;
+
+ dec_rtc_base = (void *)CKSEG1ADDR(dec_kn_slot_base + KN02_RTC);
+}
+
+static inline void prom_init_kn02xa(void)
+{
+ dec_kn_slot_base = KN02XA_SLOT_BASE;
+ dec_kn_slot_size = IOASIC_SLOT_SIZE;
+ dec_tc_bus = 1;
+
+ ioasic_base = (void *)CKSEG1ADDR(dec_kn_slot_base + IOASIC_IOCTL);
+ dec_rtc_base = (void *)CKSEG1ADDR(dec_kn_slot_base + IOASIC_TOY);
+}
+
+static inline void prom_init_kn03(void)
+{
+ dec_kn_slot_base = KN03_SLOT_BASE;
+ dec_kn_slot_size = IOASIC_SLOT_SIZE;
+ dec_tc_bus = 1;
+
+ ioasic_base = (void *)CKSEG1ADDR(dec_kn_slot_base + IOASIC_IOCTL);
+ dec_rtc_base = (void *)CKSEG1ADDR(dec_kn_slot_base + IOASIC_TOY);
+}
+
+
+void __init prom_identify_arch(u32 magic)
+{
+ unsigned char dec_cpunum, dec_firmrev, dec_etc, dec_systype;
+ u32 dec_sysid;
+
+ if (!prom_is_rex(magic)) {
+ dec_sysid = simple_strtoul(prom_getenv("systype"),
+ (char **)0, 0);
+ } else {
+ dec_sysid = rex_getsysid();
+ if (dec_sysid == 0) {
+ printk("Zero sysid returned from PROM! "
+ "Assuming a PMAX-like machine.\n");
+ dec_sysid = 1;
+ }
+ }
+
+ dec_cpunum = (dec_sysid & 0xff000000) >> 24;
+ dec_systype = (dec_sysid & 0xff0000) >> 16;
+ dec_firmrev = (dec_sysid & 0xff00) >> 8;
+ dec_etc = dec_sysid & 0xff;
+
+ /*
+ * FIXME: This may not be an exhaustive list of DECStations/Servers!
+ * Put all model-specific initialisation calls here.
+ */
+ switch (dec_systype) {
+ case DS2100_3100:
+ mips_machtype = MACH_DS23100;
+ prom_init_kn01();
+ break;
+ case DS5100: /* DS5100 MIPSMATE */
+ mips_machtype = MACH_DS5100;
+ prom_init_kn230();
+ break;
+ case DS5000_200: /* DS5000 3max */
+ mips_machtype = MACH_DS5000_200;
+ prom_init_kn02();
+ break;
+ case DS5000_1XX: /* DS5000/100 3min */
+ mips_machtype = MACH_DS5000_1XX;
+ prom_init_kn02xa();
+ break;
+ case DS5000_2X0: /* DS5000/240 3max+ or DS5900 bigmax */
+ mips_machtype = MACH_DS5000_2X0;
+ prom_init_kn03();
+ if (!(ioasic_read(IO_REG_SIR) & KN03_IO_INR_3MAXP))
+ mips_machtype = MACH_DS5900;
+ break;
+ case DS5000_XX: /* Personal DS5000/xx maxine */
+ mips_machtype = MACH_DS5000_XX;
+ prom_init_kn02xa();
+ break;
+ case DS5800: /* DS5800 Isis */
+ mips_machtype = MACH_DS5800;
+ break;
+ case DS5400: /* DS5400 MIPSfair */
+ mips_machtype = MACH_DS5400;
+ break;
+ case DS5500: /* DS5500 MIPSfair-2 */
+ mips_machtype = MACH_DS5500;
+ break;
+ default:
+ mips_machtype = MACH_DSUNKNOWN;
+ break;
+ }
+
+ if (mips_machtype == MACH_DSUNKNOWN)
+ printk("This is an %s, id is %x\n",
+ dec_system_strings[mips_machtype], dec_systype);
+ else
+ printk("This is a %s\n", dec_system_strings[mips_machtype]);
+}
diff --git a/arch/mips/dec/prom/init.c b/arch/mips/dec/prom/init.c
new file mode 100644
index 0000000000..cb12eb211a
--- /dev/null
+++ b/arch/mips/dec/prom/init.c
@@ -0,0 +1,137 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * init.c: PROM library initialisation code.
+ *
+ * Copyright (C) 1998 Harald Koerfgen
+ * Copyright (C) 2002, 2004 Maciej W. Rozycki
+ */
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/linkage.h>
+#include <linux/smp.h>
+#include <linux/string.h>
+#include <linux/types.h>
+
+#include <asm/bootinfo.h>
+#include <asm/cpu.h>
+#include <asm/cpu-type.h>
+#include <asm/processor.h>
+
+#include <asm/dec/prom.h>
+
+
+int (*__rex_bootinit)(void);
+int (*__rex_bootread)(void);
+int (*__rex_getbitmap)(memmap *);
+unsigned long *(*__rex_slot_address)(int);
+void *(*__rex_gettcinfo)(void);
+int (*__rex_getsysid)(void);
+void (*__rex_clear_cache)(void);
+
+int (*__prom_getchar)(void);
+char *(*__prom_getenv)(char *);
+int (*__prom_printf)(char *, ...);
+
+int (*__pmax_open)(char*, int);
+int (*__pmax_lseek)(int, long, int);
+int (*__pmax_read)(int, void *, int);
+int (*__pmax_close)(int);
+
+
+/*
+ * Detect which PROM the DECSTATION has, and set the callback vectors
+ * appropriately.
+ */
+void __init which_prom(s32 magic, s32 *prom_vec)
+{
+ /*
+ * No sign of the REX PROM's magic number means we assume a non-REX
+ * machine (i.e. we're on a DS2100/3100, DS5100 or DS5000/2xx)
+ */
+ if (prom_is_rex(magic)) {
+ /*
+ * Set up prom abstraction structure with REX entry points.
+ */
+ __rex_bootinit =
+ (void *)(long)*(prom_vec + REX_PROM_BOOTINIT);
+ __rex_bootread =
+ (void *)(long)*(prom_vec + REX_PROM_BOOTREAD);
+ __rex_getbitmap =
+ (void *)(long)*(prom_vec + REX_PROM_GETBITMAP);
+ __prom_getchar =
+ (void *)(long)*(prom_vec + REX_PROM_GETCHAR);
+ __prom_getenv =
+ (void *)(long)*(prom_vec + REX_PROM_GETENV);
+ __rex_getsysid =
+ (void *)(long)*(prom_vec + REX_PROM_GETSYSID);
+ __rex_gettcinfo =
+ (void *)(long)*(prom_vec + REX_PROM_GETTCINFO);
+ __prom_printf =
+ (void *)(long)*(prom_vec + REX_PROM_PRINTF);
+ __rex_slot_address =
+ (void *)(long)*(prom_vec + REX_PROM_SLOTADDR);
+ __rex_clear_cache =
+ (void *)(long)*(prom_vec + REX_PROM_CLEARCACHE);
+ } else {
+ /*
+ * Set up prom abstraction structure with non-REX entry points.
+ */
+ __prom_getchar = (void *)PMAX_PROM_GETCHAR;
+ __prom_getenv = (void *)PMAX_PROM_GETENV;
+ __prom_printf = (void *)PMAX_PROM_PRINTF;
+ __pmax_open = (void *)PMAX_PROM_OPEN;
+ __pmax_lseek = (void *)PMAX_PROM_LSEEK;
+ __pmax_read = (void *)PMAX_PROM_READ;
+ __pmax_close = (void *)PMAX_PROM_CLOSE;
+ }
+}
+
+void __init prom_init(void)
+{
+ extern void dec_machine_halt(void);
+ static const char cpu_msg[] __initconst =
+ "Sorry, this kernel is compiled for a wrong CPU type!\n";
+ s32 argc = fw_arg0;
+ s32 *argv = (void *)fw_arg1;
+ u32 magic = fw_arg2;
+ s32 *prom_vec = (void *)fw_arg3;
+
+ /*
+ * Determine which PROM we have
+ * (and therefore which machine we're on!)
+ */
+ which_prom(magic, prom_vec);
+
+ if (prom_is_rex(magic))
+ rex_clear_cache();
+
+ /* Register the early console. */
+ register_prom_console();
+
+ /* Were we compiled with the right CPU option? */
+#if defined(CONFIG_CPU_R3000)
+ if ((current_cpu_type() == CPU_R4000SC) ||
+ (current_cpu_type() == CPU_R4400SC)) {
+ static const char r4k_msg[] __initconst =
+ "Please recompile with \"CONFIG_CPU_R4X00 = y\".\n";
+ printk(cpu_msg);
+ printk(r4k_msg);
+ dec_machine_halt();
+ }
+#endif
+
+#if defined(CONFIG_CPU_R4X00)
+ if ((current_cpu_type() == CPU_R3000) ||
+ (current_cpu_type() == CPU_R3000A)) {
+ static const char r3k_msg[] __initconst =
+ "Please recompile with \"CONFIG_CPU_R3000 = y\".\n";
+ printk(cpu_msg);
+ printk(r3k_msg);
+ dec_machine_halt();
+ }
+#endif
+
+ prom_meminit(magic);
+ prom_identify_arch(magic);
+ prom_init_cmdline(argc, argv, magic);
+}
diff --git a/arch/mips/dec/prom/locore.S b/arch/mips/dec/prom/locore.S
new file mode 100644
index 0000000000..0eb8fab62a
--- /dev/null
+++ b/arch/mips/dec/prom/locore.S
@@ -0,0 +1,30 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * locore.S
+ */
+#include <asm/asm.h>
+#include <asm/regdef.h>
+#include <asm/mipsregs.h>
+
+ .text
+
+/*
+ * Simple general exception handling routine. This one is used for the
+ * Memory sizing routine for pmax machines. HK
+ */
+
+NESTED(genexcept_early, 0, sp)
+ .set noat
+ .set noreorder
+
+ mfc0 k0, CP0_STATUS
+ la k1, mem_err
+
+ sw k0, 0(k1)
+
+ mfc0 k0, CP0_EPC
+ nop
+ addiu k0, 4 # skip the causing instruction
+ jr k0
+ rfe
+END(genexcept_early)
diff --git a/arch/mips/dec/prom/memory.c b/arch/mips/dec/prom/memory.c
new file mode 100644
index 0000000000..44490c30d6
--- /dev/null
+++ b/arch/mips/dec/prom/memory.c
@@ -0,0 +1,117 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * memory.c: memory initialisation code.
+ *
+ * Copyright (C) 1998 Harald Koerfgen, Frieder Streffer and Paul M. Antoine
+ * Copyright (C) 2000, 2002 Maciej W. Rozycki
+ */
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/memblock.h>
+#include <linux/types.h>
+
+#include <asm/addrspace.h>
+#include <asm/dec/machtype.h>
+#include <asm/dec/prom.h>
+#include <asm/page.h>
+#include <asm/sections.h>
+
+
+volatile unsigned long mem_err; /* So we know an error occurred */
+
+/*
+ * Probe memory in 4MB chunks, waiting for an error to tell us we've fallen
+ * off the end of real memory. Only suitable for the 2100/3100's (PMAX).
+ */
+
+#define CHUNK_SIZE 0x400000
+
+static __init void pmax_setup_memory_region(void)
+{
+ volatile unsigned char *memory_page, dummy;
+ char old_handler[0x80];
+ extern char genexcept_early;
+
+ /* Install exception handler */
+ memcpy(&old_handler, (void *)(CKSEG0 + 0x80), 0x80);
+ memcpy((void *)(CKSEG0 + 0x80), &genexcept_early, 0x80);
+
+ /* read unmapped and uncached (KSEG1)
+ * DECstations have at least 4MB RAM
+ * Assume less than 480MB of RAM, as this is max for 5000/2xx
+ * FIXME this should be replaced by the first free page!
+ */
+ for (memory_page = (unsigned char *)CKSEG1 + CHUNK_SIZE;
+ mem_err == 0 && memory_page < (unsigned char *)CKSEG1 + 0x1e00000;
+ memory_page += CHUNK_SIZE) {
+ dummy = *memory_page;
+ }
+ memcpy((void *)(CKSEG0 + 0x80), &old_handler, 0x80);
+
+ memblock_add(0, (unsigned long)memory_page - CKSEG1 - CHUNK_SIZE);
+}
+
+/*
+ * Use the REX prom calls to get hold of the memory bitmap, and thence
+ * determine memory size.
+ */
+static __init void rex_setup_memory_region(void)
+{
+ int i, bitmap_size;
+ unsigned long mem_start = 0, mem_size = 0;
+ memmap *bm;
+
+ /* some free 64k */
+ bm = (memmap *)CKSEG0ADDR(0x28000);
+
+ bitmap_size = rex_getbitmap(bm);
+
+ for (i = 0; i < bitmap_size; i++) {
+ /* FIXME: very simplistically only add full sets of pages */
+ if (bm->bitmap[i] == 0xff)
+ mem_size += (8 * bm->pagesize);
+ else if (!mem_size)
+ mem_start += (8 * bm->pagesize);
+ else {
+ memblock_add(mem_start, mem_size);
+ mem_start += mem_size + (8 * bm->pagesize);
+ mem_size = 0;
+ }
+ }
+ if (mem_size)
+ memblock_add(mem_start, mem_size);
+}
+
+void __init prom_meminit(u32 magic)
+{
+ if (!prom_is_rex(magic))
+ pmax_setup_memory_region();
+ else
+ rex_setup_memory_region();
+}
+
+void __init prom_free_prom_memory(void)
+{
+ unsigned long end;
+
+ /*
+ * Free everything below the kernel itself but leave
+ * the first page reserved for the exception handlers.
+ */
+
+#if IS_ENABLED(CONFIG_DECLANCE)
+ /*
+ * Leave 128 KB reserved for Lance memory for
+ * IOASIC DECstations.
+ *
+ * XXX: save this address for use in dec_lance.c?
+ */
+ if (IOASIC)
+ end = __pa(&_text) - 0x00020000;
+ else
+#endif
+ end = __pa(&_text);
+
+ free_init_pages("unused PROM memory", PAGE_SIZE, end);
+}
diff --git a/arch/mips/dec/reset.c b/arch/mips/dec/reset.c
new file mode 100644
index 0000000000..3df01f1da3
--- /dev/null
+++ b/arch/mips/dec/reset.c
@@ -0,0 +1,41 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Reset a DECstation machine.
+ *
+ * Copyright (C) 199x the Anonymous
+ * Copyright (C) 2001, 2002, 2003 Maciej W. Rozycki
+ */
+#include <linux/interrupt.h>
+#include <linux/linkage.h>
+
+#include <asm/addrspace.h>
+
+typedef void __noreturn (* noret_func_t)(void);
+
+static inline void __noreturn back_to_prom(void)
+{
+ noret_func_t func = (void *)CKSEG1ADDR(0x1fc00000);
+
+ func();
+}
+
+void __noreturn dec_machine_restart(char *command)
+{
+ back_to_prom();
+}
+
+void __noreturn dec_machine_halt(void)
+{
+ back_to_prom();
+}
+
+void __noreturn dec_machine_power_off(void)
+{
+ /* DECstations don't have a software power switch */
+ back_to_prom();
+}
+
+irqreturn_t dec_intr_halt(int irq, void *dev_id)
+{
+ dec_machine_halt();
+}
diff --git a/arch/mips/dec/setup.c b/arch/mips/dec/setup.c
new file mode 100644
index 0000000000..6c3704f51d
--- /dev/null
+++ b/arch/mips/dec/setup.c
@@ -0,0 +1,784 @@
+/*
+ * System-specific setup, especially interrupts.
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 1998 Harald Koerfgen
+ * Copyright (C) 2000, 2001, 2002, 2003, 2005, 2020 Maciej W. Rozycki
+ */
+#include <linux/console.h>
+#include <linux/export.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+#include <linux/irq.h>
+#include <linux/irqnr.h>
+#include <linux/memblock.h>
+#include <linux/param.h>
+#include <linux/percpu-defs.h>
+#include <linux/sched.h>
+#include <linux/spinlock.h>
+#include <linux/types.h>
+#include <linux/pm.h>
+
+#include <asm/addrspace.h>
+#include <asm/bootinfo.h>
+#include <asm/cpu.h>
+#include <asm/cpu-features.h>
+#include <asm/cpu-type.h>
+#include <asm/irq.h>
+#include <asm/irq_cpu.h>
+#include <asm/mipsregs.h>
+#include <asm/page.h>
+#include <asm/reboot.h>
+#include <asm/sections.h>
+#include <asm/time.h>
+#include <asm/traps.h>
+#include <asm/wbflush.h>
+
+#include <asm/dec/interrupts.h>
+#include <asm/dec/ioasic.h>
+#include <asm/dec/ioasic_addrs.h>
+#include <asm/dec/ioasic_ints.h>
+#include <asm/dec/kn01.h>
+#include <asm/dec/kn02.h>
+#include <asm/dec/kn02ba.h>
+#include <asm/dec/kn02ca.h>
+#include <asm/dec/kn03.h>
+#include <asm/dec/kn230.h>
+#include <asm/dec/system.h>
+
+
+extern void dec_machine_restart(char *command);
+extern void dec_machine_halt(void);
+extern void dec_machine_power_off(void);
+extern irqreturn_t dec_intr_halt(int irq, void *dev_id);
+
+unsigned long dec_kn_slot_base, dec_kn_slot_size;
+
+EXPORT_SYMBOL(dec_kn_slot_base);
+EXPORT_SYMBOL(dec_kn_slot_size);
+
+int dec_tc_bus;
+
+DEFINE_SPINLOCK(ioasic_ssr_lock);
+EXPORT_SYMBOL(ioasic_ssr_lock);
+
+volatile u32 *ioasic_base;
+
+EXPORT_SYMBOL(ioasic_base);
+
+/*
+ * IRQ routing and priority tables. Priorities are set as follows:
+ *
+ * KN01 KN230 KN02 KN02-BA KN02-CA KN03
+ *
+ * MEMORY CPU CPU CPU ASIC CPU CPU
+ * RTC CPU CPU CPU ASIC CPU CPU
+ * DMA - - - ASIC ASIC ASIC
+ * SERIAL0 CPU CPU CSR ASIC ASIC ASIC
+ * SERIAL1 - - - ASIC - ASIC
+ * SCSI CPU CPU CSR ASIC ASIC ASIC
+ * ETHERNET CPU * CSR ASIC ASIC ASIC
+ * other - - - ASIC - -
+ * TC2 - - CSR CPU ASIC ASIC
+ * TC1 - - CSR CPU ASIC ASIC
+ * TC0 - - CSR CPU ASIC ASIC
+ * other - CPU - CPU ASIC ASIC
+ * other - - - - CPU CPU
+ *
+ * * -- shared with SCSI
+ */
+
+int dec_interrupt[DEC_NR_INTS] = {
+ [0 ... DEC_NR_INTS - 1] = -1
+};
+
+EXPORT_SYMBOL(dec_interrupt);
+
+int_ptr cpu_mask_nr_tbl[DEC_MAX_CPU_INTS][2] = {
+ { { .i = ~0 }, { .p = dec_intr_unimplemented } },
+};
+int_ptr asic_mask_nr_tbl[DEC_MAX_ASIC_INTS][2] = {
+ { { .i = ~0 }, { .p = asic_intr_unimplemented } },
+};
+int cpu_fpu_mask = DEC_CPU_IRQ_MASK(DEC_CPU_INR_FPU);
+int *fpu_kstat_irq;
+
+static irq_handler_t busirq_handler;
+static unsigned int busirq_flags = IRQF_NO_THREAD;
+
+/*
+ * Bus error (DBE/IBE exceptions and bus interrupts) handling setup.
+ */
+static void __init dec_be_init(void)
+{
+ switch (mips_machtype) {
+ case MACH_DS23100: /* DS2100/DS3100 Pmin/Pmax */
+ mips_set_be_handler(dec_kn01_be_handler);
+ busirq_handler = dec_kn01_be_interrupt;
+ busirq_flags |= IRQF_SHARED;
+ dec_kn01_be_init();
+ break;
+ case MACH_DS5000_1XX: /* DS5000/1xx 3min */
+ case MACH_DS5000_XX: /* DS5000/xx Maxine */
+ mips_set_be_handler(dec_kn02xa_be_handler);
+ busirq_handler = dec_kn02xa_be_interrupt;
+ dec_kn02xa_be_init();
+ break;
+ case MACH_DS5000_200: /* DS5000/200 3max */
+ case MACH_DS5000_2X0: /* DS5000/240 3max+ */
+ case MACH_DS5900: /* DS5900 bigmax */
+ mips_set_be_handler(dec_ecc_be_handler);
+ busirq_handler = dec_ecc_be_interrupt;
+ dec_ecc_be_init();
+ break;
+ }
+}
+
+void __init plat_mem_setup(void)
+{
+ board_be_init = dec_be_init;
+
+ wbflush_setup();
+
+ _machine_restart = dec_machine_restart;
+ _machine_halt = dec_machine_halt;
+ pm_power_off = dec_machine_power_off;
+
+ ioport_resource.start = ~0UL;
+ ioport_resource.end = 0UL;
+
+ /* Stay away from the firmware working memory area for now. */
+ memblock_reserve(PHYS_OFFSET, __pa_symbol(&_text) - PHYS_OFFSET);
+}
+
+/*
+ * Machine-specific initialisation for KN01, aka DS2100 (aka Pmin)
+ * or DS3100 (aka Pmax).
+ */
+static int kn01_interrupt[DEC_NR_INTS] __initdata = {
+ [DEC_IRQ_CASCADE] = -1,
+ [DEC_IRQ_AB_RECV] = -1,
+ [DEC_IRQ_AB_XMIT] = -1,
+ [DEC_IRQ_DZ11] = DEC_CPU_IRQ_NR(KN01_CPU_INR_DZ11),
+ [DEC_IRQ_ASC] = -1,
+ [DEC_IRQ_FLOPPY] = -1,
+ [DEC_IRQ_FPU] = DEC_CPU_IRQ_NR(DEC_CPU_INR_FPU),
+ [DEC_IRQ_HALT] = -1,
+ [DEC_IRQ_ISDN] = -1,
+ [DEC_IRQ_LANCE] = DEC_CPU_IRQ_NR(KN01_CPU_INR_LANCE),
+ [DEC_IRQ_BUS] = DEC_CPU_IRQ_NR(KN01_CPU_INR_BUS),
+ [DEC_IRQ_PSU] = -1,
+ [DEC_IRQ_RTC] = DEC_CPU_IRQ_NR(KN01_CPU_INR_RTC),
+ [DEC_IRQ_SCC0] = -1,
+ [DEC_IRQ_SCC1] = -1,
+ [DEC_IRQ_SII] = DEC_CPU_IRQ_NR(KN01_CPU_INR_SII),
+ [DEC_IRQ_TC0] = -1,
+ [DEC_IRQ_TC1] = -1,
+ [DEC_IRQ_TC2] = -1,
+ [DEC_IRQ_TIMER] = -1,
+ [DEC_IRQ_VIDEO] = DEC_CPU_IRQ_NR(KN01_CPU_INR_VIDEO),
+ [DEC_IRQ_ASC_MERR] = -1,
+ [DEC_IRQ_ASC_ERR] = -1,
+ [DEC_IRQ_ASC_DMA] = -1,
+ [DEC_IRQ_FLOPPY_ERR] = -1,
+ [DEC_IRQ_ISDN_ERR] = -1,
+ [DEC_IRQ_ISDN_RXDMA] = -1,
+ [DEC_IRQ_ISDN_TXDMA] = -1,
+ [DEC_IRQ_LANCE_MERR] = -1,
+ [DEC_IRQ_SCC0A_RXERR] = -1,
+ [DEC_IRQ_SCC0A_RXDMA] = -1,
+ [DEC_IRQ_SCC0A_TXERR] = -1,
+ [DEC_IRQ_SCC0A_TXDMA] = -1,
+ [DEC_IRQ_AB_RXERR] = -1,
+ [DEC_IRQ_AB_RXDMA] = -1,
+ [DEC_IRQ_AB_TXERR] = -1,
+ [DEC_IRQ_AB_TXDMA] = -1,
+ [DEC_IRQ_SCC1A_RXERR] = -1,
+ [DEC_IRQ_SCC1A_RXDMA] = -1,
+ [DEC_IRQ_SCC1A_TXERR] = -1,
+ [DEC_IRQ_SCC1A_TXDMA] = -1,
+};
+
+static int_ptr kn01_cpu_mask_nr_tbl[][2] __initdata = {
+ { { .i = DEC_CPU_IRQ_MASK(KN01_CPU_INR_BUS) },
+ { .i = DEC_CPU_IRQ_NR(KN01_CPU_INR_BUS) } },
+ { { .i = DEC_CPU_IRQ_MASK(KN01_CPU_INR_RTC) },
+ { .i = DEC_CPU_IRQ_NR(KN01_CPU_INR_RTC) } },
+ { { .i = DEC_CPU_IRQ_MASK(KN01_CPU_INR_DZ11) },
+ { .i = DEC_CPU_IRQ_NR(KN01_CPU_INR_DZ11) } },
+ { { .i = DEC_CPU_IRQ_MASK(KN01_CPU_INR_SII) },
+ { .i = DEC_CPU_IRQ_NR(KN01_CPU_INR_SII) } },
+ { { .i = DEC_CPU_IRQ_MASK(KN01_CPU_INR_LANCE) },
+ { .i = DEC_CPU_IRQ_NR(KN01_CPU_INR_LANCE) } },
+ { { .i = DEC_CPU_IRQ_ALL },
+ { .p = cpu_all_int } },
+};
+
+static void __init dec_init_kn01(void)
+{
+ /* IRQ routing. */
+ memcpy(&dec_interrupt, &kn01_interrupt,
+ sizeof(kn01_interrupt));
+
+ /* CPU IRQ priorities. */
+ memcpy(&cpu_mask_nr_tbl, &kn01_cpu_mask_nr_tbl,
+ sizeof(kn01_cpu_mask_nr_tbl));
+
+ mips_cpu_irq_init();
+
+} /* dec_init_kn01 */
+
+
+/*
+ * Machine-specific initialisation for KN230, aka DS5100, aka MIPSmate.
+ */
+static int kn230_interrupt[DEC_NR_INTS] __initdata = {
+ [DEC_IRQ_CASCADE] = -1,
+ [DEC_IRQ_AB_RECV] = -1,
+ [DEC_IRQ_AB_XMIT] = -1,
+ [DEC_IRQ_DZ11] = DEC_CPU_IRQ_NR(KN230_CPU_INR_DZ11),
+ [DEC_IRQ_ASC] = -1,
+ [DEC_IRQ_FLOPPY] = -1,
+ [DEC_IRQ_FPU] = DEC_CPU_IRQ_NR(DEC_CPU_INR_FPU),
+ [DEC_IRQ_HALT] = DEC_CPU_IRQ_NR(KN230_CPU_INR_HALT),
+ [DEC_IRQ_ISDN] = -1,
+ [DEC_IRQ_LANCE] = DEC_CPU_IRQ_NR(KN230_CPU_INR_LANCE),
+ [DEC_IRQ_BUS] = DEC_CPU_IRQ_NR(KN230_CPU_INR_BUS),
+ [DEC_IRQ_PSU] = -1,
+ [DEC_IRQ_RTC] = DEC_CPU_IRQ_NR(KN230_CPU_INR_RTC),
+ [DEC_IRQ_SCC0] = -1,
+ [DEC_IRQ_SCC1] = -1,
+ [DEC_IRQ_SII] = DEC_CPU_IRQ_NR(KN230_CPU_INR_SII),
+ [DEC_IRQ_TC0] = -1,
+ [DEC_IRQ_TC1] = -1,
+ [DEC_IRQ_TC2] = -1,
+ [DEC_IRQ_TIMER] = -1,
+ [DEC_IRQ_VIDEO] = -1,
+ [DEC_IRQ_ASC_MERR] = -1,
+ [DEC_IRQ_ASC_ERR] = -1,
+ [DEC_IRQ_ASC_DMA] = -1,
+ [DEC_IRQ_FLOPPY_ERR] = -1,
+ [DEC_IRQ_ISDN_ERR] = -1,
+ [DEC_IRQ_ISDN_RXDMA] = -1,
+ [DEC_IRQ_ISDN_TXDMA] = -1,
+ [DEC_IRQ_LANCE_MERR] = -1,
+ [DEC_IRQ_SCC0A_RXERR] = -1,
+ [DEC_IRQ_SCC0A_RXDMA] = -1,
+ [DEC_IRQ_SCC0A_TXERR] = -1,
+ [DEC_IRQ_SCC0A_TXDMA] = -1,
+ [DEC_IRQ_AB_RXERR] = -1,
+ [DEC_IRQ_AB_RXDMA] = -1,
+ [DEC_IRQ_AB_TXERR] = -1,
+ [DEC_IRQ_AB_TXDMA] = -1,
+ [DEC_IRQ_SCC1A_RXERR] = -1,
+ [DEC_IRQ_SCC1A_RXDMA] = -1,
+ [DEC_IRQ_SCC1A_TXERR] = -1,
+ [DEC_IRQ_SCC1A_TXDMA] = -1,
+};
+
+static int_ptr kn230_cpu_mask_nr_tbl[][2] __initdata = {
+ { { .i = DEC_CPU_IRQ_MASK(KN230_CPU_INR_BUS) },
+ { .i = DEC_CPU_IRQ_NR(KN230_CPU_INR_BUS) } },
+ { { .i = DEC_CPU_IRQ_MASK(KN230_CPU_INR_RTC) },
+ { .i = DEC_CPU_IRQ_NR(KN230_CPU_INR_RTC) } },
+ { { .i = DEC_CPU_IRQ_MASK(KN230_CPU_INR_DZ11) },
+ { .i = DEC_CPU_IRQ_NR(KN230_CPU_INR_DZ11) } },
+ { { .i = DEC_CPU_IRQ_MASK(KN230_CPU_INR_SII) },
+ { .i = DEC_CPU_IRQ_NR(KN230_CPU_INR_SII) } },
+ { { .i = DEC_CPU_IRQ_ALL },
+ { .p = cpu_all_int } },
+};
+
+static void __init dec_init_kn230(void)
+{
+ /* IRQ routing. */
+ memcpy(&dec_interrupt, &kn230_interrupt,
+ sizeof(kn230_interrupt));
+
+ /* CPU IRQ priorities. */
+ memcpy(&cpu_mask_nr_tbl, &kn230_cpu_mask_nr_tbl,
+ sizeof(kn230_cpu_mask_nr_tbl));
+
+ mips_cpu_irq_init();
+
+} /* dec_init_kn230 */
+
+
+/*
+ * Machine-specific initialisation for KN02, aka DS5000/200, aka 3max.
+ */
+static int kn02_interrupt[DEC_NR_INTS] __initdata = {
+ [DEC_IRQ_CASCADE] = DEC_CPU_IRQ_NR(KN02_CPU_INR_CASCADE),
+ [DEC_IRQ_AB_RECV] = -1,
+ [DEC_IRQ_AB_XMIT] = -1,
+ [DEC_IRQ_DZ11] = KN02_IRQ_NR(KN02_CSR_INR_DZ11),
+ [DEC_IRQ_ASC] = KN02_IRQ_NR(KN02_CSR_INR_ASC),
+ [DEC_IRQ_FLOPPY] = -1,
+ [DEC_IRQ_FPU] = DEC_CPU_IRQ_NR(DEC_CPU_INR_FPU),
+ [DEC_IRQ_HALT] = -1,
+ [DEC_IRQ_ISDN] = -1,
+ [DEC_IRQ_LANCE] = KN02_IRQ_NR(KN02_CSR_INR_LANCE),
+ [DEC_IRQ_BUS] = DEC_CPU_IRQ_NR(KN02_CPU_INR_BUS),
+ [DEC_IRQ_PSU] = -1,
+ [DEC_IRQ_RTC] = DEC_CPU_IRQ_NR(KN02_CPU_INR_RTC),
+ [DEC_IRQ_SCC0] = -1,
+ [DEC_IRQ_SCC1] = -1,
+ [DEC_IRQ_SII] = -1,
+ [DEC_IRQ_TC0] = KN02_IRQ_NR(KN02_CSR_INR_TC0),
+ [DEC_IRQ_TC1] = KN02_IRQ_NR(KN02_CSR_INR_TC1),
+ [DEC_IRQ_TC2] = KN02_IRQ_NR(KN02_CSR_INR_TC2),
+ [DEC_IRQ_TIMER] = -1,
+ [DEC_IRQ_VIDEO] = -1,
+ [DEC_IRQ_ASC_MERR] = -1,
+ [DEC_IRQ_ASC_ERR] = -1,
+ [DEC_IRQ_ASC_DMA] = -1,
+ [DEC_IRQ_FLOPPY_ERR] = -1,
+ [DEC_IRQ_ISDN_ERR] = -1,
+ [DEC_IRQ_ISDN_RXDMA] = -1,
+ [DEC_IRQ_ISDN_TXDMA] = -1,
+ [DEC_IRQ_LANCE_MERR] = -1,
+ [DEC_IRQ_SCC0A_RXERR] = -1,
+ [DEC_IRQ_SCC0A_RXDMA] = -1,
+ [DEC_IRQ_SCC0A_TXERR] = -1,
+ [DEC_IRQ_SCC0A_TXDMA] = -1,
+ [DEC_IRQ_AB_RXERR] = -1,
+ [DEC_IRQ_AB_RXDMA] = -1,
+ [DEC_IRQ_AB_TXERR] = -1,
+ [DEC_IRQ_AB_TXDMA] = -1,
+ [DEC_IRQ_SCC1A_RXERR] = -1,
+ [DEC_IRQ_SCC1A_RXDMA] = -1,
+ [DEC_IRQ_SCC1A_TXERR] = -1,
+ [DEC_IRQ_SCC1A_TXDMA] = -1,
+};
+
+static int_ptr kn02_cpu_mask_nr_tbl[][2] __initdata = {
+ { { .i = DEC_CPU_IRQ_MASK(KN02_CPU_INR_BUS) },
+ { .i = DEC_CPU_IRQ_NR(KN02_CPU_INR_BUS) } },
+ { { .i = DEC_CPU_IRQ_MASK(KN02_CPU_INR_RTC) },
+ { .i = DEC_CPU_IRQ_NR(KN02_CPU_INR_RTC) } },
+ { { .i = DEC_CPU_IRQ_MASK(KN02_CPU_INR_CASCADE) },
+ { .p = kn02_io_int } },
+ { { .i = DEC_CPU_IRQ_ALL },
+ { .p = cpu_all_int } },
+};
+
+static int_ptr kn02_asic_mask_nr_tbl[][2] __initdata = {
+ { { .i = KN02_IRQ_MASK(KN02_CSR_INR_DZ11) },
+ { .i = KN02_IRQ_NR(KN02_CSR_INR_DZ11) } },
+ { { .i = KN02_IRQ_MASK(KN02_CSR_INR_ASC) },
+ { .i = KN02_IRQ_NR(KN02_CSR_INR_ASC) } },
+ { { .i = KN02_IRQ_MASK(KN02_CSR_INR_LANCE) },
+ { .i = KN02_IRQ_NR(KN02_CSR_INR_LANCE) } },
+ { { .i = KN02_IRQ_MASK(KN02_CSR_INR_TC2) },
+ { .i = KN02_IRQ_NR(KN02_CSR_INR_TC2) } },
+ { { .i = KN02_IRQ_MASK(KN02_CSR_INR_TC1) },
+ { .i = KN02_IRQ_NR(KN02_CSR_INR_TC1) } },
+ { { .i = KN02_IRQ_MASK(KN02_CSR_INR_TC0) },
+ { .i = KN02_IRQ_NR(KN02_CSR_INR_TC0) } },
+ { { .i = KN02_IRQ_ALL },
+ { .p = kn02_all_int } },
+};
+
+static void __init dec_init_kn02(void)
+{
+ /* IRQ routing. */
+ memcpy(&dec_interrupt, &kn02_interrupt,
+ sizeof(kn02_interrupt));
+
+ /* CPU IRQ priorities. */
+ memcpy(&cpu_mask_nr_tbl, &kn02_cpu_mask_nr_tbl,
+ sizeof(kn02_cpu_mask_nr_tbl));
+
+ /* KN02 CSR IRQ priorities. */
+ memcpy(&asic_mask_nr_tbl, &kn02_asic_mask_nr_tbl,
+ sizeof(kn02_asic_mask_nr_tbl));
+
+ mips_cpu_irq_init();
+ init_kn02_irqs(KN02_IRQ_BASE);
+
+} /* dec_init_kn02 */
+
+
+/*
+ * Machine-specific initialisation for KN02-BA, aka DS5000/1xx
+ * (xx = 20, 25, 33), aka 3min. Also applies to KN04(-BA), aka
+ * DS5000/150, aka 4min.
+ */
+static int kn02ba_interrupt[DEC_NR_INTS] __initdata = {
+ [DEC_IRQ_CASCADE] = DEC_CPU_IRQ_NR(KN02BA_CPU_INR_CASCADE),
+ [DEC_IRQ_AB_RECV] = -1,
+ [DEC_IRQ_AB_XMIT] = -1,
+ [DEC_IRQ_DZ11] = -1,
+ [DEC_IRQ_ASC] = IO_IRQ_NR(KN02BA_IO_INR_ASC),
+ [DEC_IRQ_FLOPPY] = -1,
+ [DEC_IRQ_FPU] = DEC_CPU_IRQ_NR(DEC_CPU_INR_FPU),
+ [DEC_IRQ_HALT] = DEC_CPU_IRQ_NR(KN02BA_CPU_INR_HALT),
+ [DEC_IRQ_ISDN] = -1,
+ [DEC_IRQ_LANCE] = IO_IRQ_NR(KN02BA_IO_INR_LANCE),
+ [DEC_IRQ_BUS] = IO_IRQ_NR(KN02BA_IO_INR_BUS),
+ [DEC_IRQ_PSU] = IO_IRQ_NR(KN02BA_IO_INR_PSU),
+ [DEC_IRQ_RTC] = IO_IRQ_NR(KN02BA_IO_INR_RTC),
+ [DEC_IRQ_SCC0] = IO_IRQ_NR(KN02BA_IO_INR_SCC0),
+ [DEC_IRQ_SCC1] = IO_IRQ_NR(KN02BA_IO_INR_SCC1),
+ [DEC_IRQ_SII] = -1,
+ [DEC_IRQ_TC0] = DEC_CPU_IRQ_NR(KN02BA_CPU_INR_TC0),
+ [DEC_IRQ_TC1] = DEC_CPU_IRQ_NR(KN02BA_CPU_INR_TC1),
+ [DEC_IRQ_TC2] = DEC_CPU_IRQ_NR(KN02BA_CPU_INR_TC2),
+ [DEC_IRQ_TIMER] = -1,
+ [DEC_IRQ_VIDEO] = -1,
+ [DEC_IRQ_ASC_MERR] = IO_IRQ_NR(IO_INR_ASC_MERR),
+ [DEC_IRQ_ASC_ERR] = IO_IRQ_NR(IO_INR_ASC_ERR),
+ [DEC_IRQ_ASC_DMA] = IO_IRQ_NR(IO_INR_ASC_DMA),
+ [DEC_IRQ_FLOPPY_ERR] = -1,
+ [DEC_IRQ_ISDN_ERR] = -1,
+ [DEC_IRQ_ISDN_RXDMA] = -1,
+ [DEC_IRQ_ISDN_TXDMA] = -1,
+ [DEC_IRQ_LANCE_MERR] = IO_IRQ_NR(IO_INR_LANCE_MERR),
+ [DEC_IRQ_SCC0A_RXERR] = IO_IRQ_NR(IO_INR_SCC0A_RXERR),
+ [DEC_IRQ_SCC0A_RXDMA] = IO_IRQ_NR(IO_INR_SCC0A_RXDMA),
+ [DEC_IRQ_SCC0A_TXERR] = IO_IRQ_NR(IO_INR_SCC0A_TXERR),
+ [DEC_IRQ_SCC0A_TXDMA] = IO_IRQ_NR(IO_INR_SCC0A_TXDMA),
+ [DEC_IRQ_AB_RXERR] = -1,
+ [DEC_IRQ_AB_RXDMA] = -1,
+ [DEC_IRQ_AB_TXERR] = -1,
+ [DEC_IRQ_AB_TXDMA] = -1,
+ [DEC_IRQ_SCC1A_RXERR] = IO_IRQ_NR(IO_INR_SCC1A_RXERR),
+ [DEC_IRQ_SCC1A_RXDMA] = IO_IRQ_NR(IO_INR_SCC1A_RXDMA),
+ [DEC_IRQ_SCC1A_TXERR] = IO_IRQ_NR(IO_INR_SCC1A_TXERR),
+ [DEC_IRQ_SCC1A_TXDMA] = IO_IRQ_NR(IO_INR_SCC1A_TXDMA),
+};
+
+static int_ptr kn02ba_cpu_mask_nr_tbl[][2] __initdata = {
+ { { .i = DEC_CPU_IRQ_MASK(KN02BA_CPU_INR_CASCADE) },
+ { .p = kn02xa_io_int } },
+ { { .i = DEC_CPU_IRQ_MASK(KN02BA_CPU_INR_TC2) },
+ { .i = DEC_CPU_IRQ_NR(KN02BA_CPU_INR_TC2) } },
+ { { .i = DEC_CPU_IRQ_MASK(KN02BA_CPU_INR_TC1) },
+ { .i = DEC_CPU_IRQ_NR(KN02BA_CPU_INR_TC1) } },
+ { { .i = DEC_CPU_IRQ_MASK(KN02BA_CPU_INR_TC0) },
+ { .i = DEC_CPU_IRQ_NR(KN02BA_CPU_INR_TC0) } },
+ { { .i = DEC_CPU_IRQ_ALL },
+ { .p = cpu_all_int } },
+};
+
+static int_ptr kn02ba_asic_mask_nr_tbl[][2] __initdata = {
+ { { .i = IO_IRQ_MASK(KN02BA_IO_INR_BUS) },
+ { .i = IO_IRQ_NR(KN02BA_IO_INR_BUS) } },
+ { { .i = IO_IRQ_MASK(KN02BA_IO_INR_RTC) },
+ { .i = IO_IRQ_NR(KN02BA_IO_INR_RTC) } },
+ { { .i = IO_IRQ_DMA },
+ { .p = asic_dma_int } },
+ { { .i = IO_IRQ_MASK(KN02BA_IO_INR_SCC0) },
+ { .i = IO_IRQ_NR(KN02BA_IO_INR_SCC0) } },
+ { { .i = IO_IRQ_MASK(KN02BA_IO_INR_SCC1) },
+ { .i = IO_IRQ_NR(KN02BA_IO_INR_SCC1) } },
+ { { .i = IO_IRQ_MASK(KN02BA_IO_INR_ASC) },
+ { .i = IO_IRQ_NR(KN02BA_IO_INR_ASC) } },
+ { { .i = IO_IRQ_MASK(KN02BA_IO_INR_LANCE) },
+ { .i = IO_IRQ_NR(KN02BA_IO_INR_LANCE) } },
+ { { .i = IO_IRQ_ALL },
+ { .p = asic_all_int } },
+};
+
+static void __init dec_init_kn02ba(void)
+{
+ /* IRQ routing. */
+ memcpy(&dec_interrupt, &kn02ba_interrupt,
+ sizeof(kn02ba_interrupt));
+
+ /* CPU IRQ priorities. */
+ memcpy(&cpu_mask_nr_tbl, &kn02ba_cpu_mask_nr_tbl,
+ sizeof(kn02ba_cpu_mask_nr_tbl));
+
+ /* I/O ASIC IRQ priorities. */
+ memcpy(&asic_mask_nr_tbl, &kn02ba_asic_mask_nr_tbl,
+ sizeof(kn02ba_asic_mask_nr_tbl));
+
+ mips_cpu_irq_init();
+ init_ioasic_irqs(IO_IRQ_BASE);
+
+} /* dec_init_kn02ba */
+
+
+/*
+ * Machine-specific initialisation for KN02-CA, aka DS5000/xx,
+ * (xx = 20, 25, 33), aka MAXine. Also applies to KN04(-CA), aka
+ * DS5000/50, aka 4MAXine.
+ */
+static int kn02ca_interrupt[DEC_NR_INTS] __initdata = {
+ [DEC_IRQ_CASCADE] = DEC_CPU_IRQ_NR(KN02CA_CPU_INR_CASCADE),
+ [DEC_IRQ_AB_RECV] = IO_IRQ_NR(KN02CA_IO_INR_AB_RECV),
+ [DEC_IRQ_AB_XMIT] = IO_IRQ_NR(KN02CA_IO_INR_AB_XMIT),
+ [DEC_IRQ_DZ11] = -1,
+ [DEC_IRQ_ASC] = IO_IRQ_NR(KN02CA_IO_INR_ASC),
+ [DEC_IRQ_FLOPPY] = IO_IRQ_NR(KN02CA_IO_INR_FLOPPY),
+ [DEC_IRQ_FPU] = DEC_CPU_IRQ_NR(DEC_CPU_INR_FPU),
+ [DEC_IRQ_HALT] = DEC_CPU_IRQ_NR(KN02CA_CPU_INR_HALT),
+ [DEC_IRQ_ISDN] = IO_IRQ_NR(KN02CA_IO_INR_ISDN),
+ [DEC_IRQ_LANCE] = IO_IRQ_NR(KN02CA_IO_INR_LANCE),
+ [DEC_IRQ_BUS] = DEC_CPU_IRQ_NR(KN02CA_CPU_INR_BUS),
+ [DEC_IRQ_PSU] = -1,
+ [DEC_IRQ_RTC] = DEC_CPU_IRQ_NR(KN02CA_CPU_INR_RTC),
+ [DEC_IRQ_SCC0] = IO_IRQ_NR(KN02CA_IO_INR_SCC0),
+ [DEC_IRQ_SCC1] = -1,
+ [DEC_IRQ_SII] = -1,
+ [DEC_IRQ_TC0] = IO_IRQ_NR(KN02CA_IO_INR_TC0),
+ [DEC_IRQ_TC1] = IO_IRQ_NR(KN02CA_IO_INR_TC1),
+ [DEC_IRQ_TC2] = -1,
+ [DEC_IRQ_TIMER] = DEC_CPU_IRQ_NR(KN02CA_CPU_INR_TIMER),
+ [DEC_IRQ_VIDEO] = IO_IRQ_NR(KN02CA_IO_INR_VIDEO),
+ [DEC_IRQ_ASC_MERR] = IO_IRQ_NR(IO_INR_ASC_MERR),
+ [DEC_IRQ_ASC_ERR] = IO_IRQ_NR(IO_INR_ASC_ERR),
+ [DEC_IRQ_ASC_DMA] = IO_IRQ_NR(IO_INR_ASC_DMA),
+ [DEC_IRQ_FLOPPY_ERR] = IO_IRQ_NR(IO_INR_FLOPPY_ERR),
+ [DEC_IRQ_ISDN_ERR] = IO_IRQ_NR(IO_INR_ISDN_ERR),
+ [DEC_IRQ_ISDN_RXDMA] = IO_IRQ_NR(IO_INR_ISDN_RXDMA),
+ [DEC_IRQ_ISDN_TXDMA] = IO_IRQ_NR(IO_INR_ISDN_TXDMA),
+ [DEC_IRQ_LANCE_MERR] = IO_IRQ_NR(IO_INR_LANCE_MERR),
+ [DEC_IRQ_SCC0A_RXERR] = IO_IRQ_NR(IO_INR_SCC0A_RXERR),
+ [DEC_IRQ_SCC0A_RXDMA] = IO_IRQ_NR(IO_INR_SCC0A_RXDMA),
+ [DEC_IRQ_SCC0A_TXERR] = IO_IRQ_NR(IO_INR_SCC0A_TXERR),
+ [DEC_IRQ_SCC0A_TXDMA] = IO_IRQ_NR(IO_INR_SCC0A_TXDMA),
+ [DEC_IRQ_AB_RXERR] = IO_IRQ_NR(IO_INR_AB_RXERR),
+ [DEC_IRQ_AB_RXDMA] = IO_IRQ_NR(IO_INR_AB_RXDMA),
+ [DEC_IRQ_AB_TXERR] = IO_IRQ_NR(IO_INR_AB_TXERR),
+ [DEC_IRQ_AB_TXDMA] = IO_IRQ_NR(IO_INR_AB_TXDMA),
+ [DEC_IRQ_SCC1A_RXERR] = -1,
+ [DEC_IRQ_SCC1A_RXDMA] = -1,
+ [DEC_IRQ_SCC1A_TXERR] = -1,
+ [DEC_IRQ_SCC1A_TXDMA] = -1,
+};
+
+static int_ptr kn02ca_cpu_mask_nr_tbl[][2] __initdata = {
+ { { .i = DEC_CPU_IRQ_MASK(KN02CA_CPU_INR_BUS) },
+ { .i = DEC_CPU_IRQ_NR(KN02CA_CPU_INR_BUS) } },
+ { { .i = DEC_CPU_IRQ_MASK(KN02CA_CPU_INR_RTC) },
+ { .i = DEC_CPU_IRQ_NR(KN02CA_CPU_INR_RTC) } },
+ { { .i = DEC_CPU_IRQ_MASK(KN02CA_CPU_INR_CASCADE) },
+ { .p = kn02xa_io_int } },
+ { { .i = DEC_CPU_IRQ_ALL },
+ { .p = cpu_all_int } },
+};
+
+static int_ptr kn02ca_asic_mask_nr_tbl[][2] __initdata = {
+ { { .i = IO_IRQ_DMA },
+ { .p = asic_dma_int } },
+ { { .i = IO_IRQ_MASK(KN02CA_IO_INR_SCC0) },
+ { .i = IO_IRQ_NR(KN02CA_IO_INR_SCC0) } },
+ { { .i = IO_IRQ_MASK(KN02CA_IO_INR_ASC) },
+ { .i = IO_IRQ_NR(KN02CA_IO_INR_ASC) } },
+ { { .i = IO_IRQ_MASK(KN02CA_IO_INR_LANCE) },
+ { .i = IO_IRQ_NR(KN02CA_IO_INR_LANCE) } },
+ { { .i = IO_IRQ_MASK(KN02CA_IO_INR_TC1) },
+ { .i = IO_IRQ_NR(KN02CA_IO_INR_TC1) } },
+ { { .i = IO_IRQ_MASK(KN02CA_IO_INR_TC0) },
+ { .i = IO_IRQ_NR(KN02CA_IO_INR_TC0) } },
+ { { .i = IO_IRQ_ALL },
+ { .p = asic_all_int } },
+};
+
+static void __init dec_init_kn02ca(void)
+{
+ /* IRQ routing. */
+ memcpy(&dec_interrupt, &kn02ca_interrupt,
+ sizeof(kn02ca_interrupt));
+
+ /* CPU IRQ priorities. */
+ memcpy(&cpu_mask_nr_tbl, &kn02ca_cpu_mask_nr_tbl,
+ sizeof(kn02ca_cpu_mask_nr_tbl));
+
+ /* I/O ASIC IRQ priorities. */
+ memcpy(&asic_mask_nr_tbl, &kn02ca_asic_mask_nr_tbl,
+ sizeof(kn02ca_asic_mask_nr_tbl));
+
+ mips_cpu_irq_init();
+ init_ioasic_irqs(IO_IRQ_BASE);
+
+} /* dec_init_kn02ca */
+
+
+/*
+ * Machine-specific initialisation for KN03, aka DS5000/240,
+ * aka 3max+ and DS5900, aka BIGmax. Also applies to KN05, aka
+ * DS5000/260, aka 4max+ and DS5900/260.
+ */
+static int kn03_interrupt[DEC_NR_INTS] __initdata = {
+ [DEC_IRQ_CASCADE] = DEC_CPU_IRQ_NR(KN03_CPU_INR_CASCADE),
+ [DEC_IRQ_AB_RECV] = -1,
+ [DEC_IRQ_AB_XMIT] = -1,
+ [DEC_IRQ_DZ11] = -1,
+ [DEC_IRQ_ASC] = IO_IRQ_NR(KN03_IO_INR_ASC),
+ [DEC_IRQ_FLOPPY] = -1,
+ [DEC_IRQ_FPU] = DEC_CPU_IRQ_NR(DEC_CPU_INR_FPU),
+ [DEC_IRQ_HALT] = DEC_CPU_IRQ_NR(KN03_CPU_INR_HALT),
+ [DEC_IRQ_ISDN] = -1,
+ [DEC_IRQ_LANCE] = IO_IRQ_NR(KN03_IO_INR_LANCE),
+ [DEC_IRQ_BUS] = DEC_CPU_IRQ_NR(KN03_CPU_INR_BUS),
+ [DEC_IRQ_PSU] = IO_IRQ_NR(KN03_IO_INR_PSU),
+ [DEC_IRQ_RTC] = DEC_CPU_IRQ_NR(KN03_CPU_INR_RTC),
+ [DEC_IRQ_SCC0] = IO_IRQ_NR(KN03_IO_INR_SCC0),
+ [DEC_IRQ_SCC1] = IO_IRQ_NR(KN03_IO_INR_SCC1),
+ [DEC_IRQ_SII] = -1,
+ [DEC_IRQ_TC0] = IO_IRQ_NR(KN03_IO_INR_TC0),
+ [DEC_IRQ_TC1] = IO_IRQ_NR(KN03_IO_INR_TC1),
+ [DEC_IRQ_TC2] = IO_IRQ_NR(KN03_IO_INR_TC2),
+ [DEC_IRQ_TIMER] = -1,
+ [DEC_IRQ_VIDEO] = -1,
+ [DEC_IRQ_ASC_MERR] = IO_IRQ_NR(IO_INR_ASC_MERR),
+ [DEC_IRQ_ASC_ERR] = IO_IRQ_NR(IO_INR_ASC_ERR),
+ [DEC_IRQ_ASC_DMA] = IO_IRQ_NR(IO_INR_ASC_DMA),
+ [DEC_IRQ_FLOPPY_ERR] = -1,
+ [DEC_IRQ_ISDN_ERR] = -1,
+ [DEC_IRQ_ISDN_RXDMA] = -1,
+ [DEC_IRQ_ISDN_TXDMA] = -1,
+ [DEC_IRQ_LANCE_MERR] = IO_IRQ_NR(IO_INR_LANCE_MERR),
+ [DEC_IRQ_SCC0A_RXERR] = IO_IRQ_NR(IO_INR_SCC0A_RXERR),
+ [DEC_IRQ_SCC0A_RXDMA] = IO_IRQ_NR(IO_INR_SCC0A_RXDMA),
+ [DEC_IRQ_SCC0A_TXERR] = IO_IRQ_NR(IO_INR_SCC0A_TXERR),
+ [DEC_IRQ_SCC0A_TXDMA] = IO_IRQ_NR(IO_INR_SCC0A_TXDMA),
+ [DEC_IRQ_AB_RXERR] = -1,
+ [DEC_IRQ_AB_RXDMA] = -1,
+ [DEC_IRQ_AB_TXERR] = -1,
+ [DEC_IRQ_AB_TXDMA] = -1,
+ [DEC_IRQ_SCC1A_RXERR] = IO_IRQ_NR(IO_INR_SCC1A_RXERR),
+ [DEC_IRQ_SCC1A_RXDMA] = IO_IRQ_NR(IO_INR_SCC1A_RXDMA),
+ [DEC_IRQ_SCC1A_TXERR] = IO_IRQ_NR(IO_INR_SCC1A_TXERR),
+ [DEC_IRQ_SCC1A_TXDMA] = IO_IRQ_NR(IO_INR_SCC1A_TXDMA),
+};
+
+static int_ptr kn03_cpu_mask_nr_tbl[][2] __initdata = {
+ { { .i = DEC_CPU_IRQ_MASK(KN03_CPU_INR_BUS) },
+ { .i = DEC_CPU_IRQ_NR(KN03_CPU_INR_BUS) } },
+ { { .i = DEC_CPU_IRQ_MASK(KN03_CPU_INR_RTC) },
+ { .i = DEC_CPU_IRQ_NR(KN03_CPU_INR_RTC) } },
+ { { .i = DEC_CPU_IRQ_MASK(KN03_CPU_INR_CASCADE) },
+ { .p = kn03_io_int } },
+ { { .i = DEC_CPU_IRQ_ALL },
+ { .p = cpu_all_int } },
+};
+
+static int_ptr kn03_asic_mask_nr_tbl[][2] __initdata = {
+ { { .i = IO_IRQ_DMA },
+ { .p = asic_dma_int } },
+ { { .i = IO_IRQ_MASK(KN03_IO_INR_SCC0) },
+ { .i = IO_IRQ_NR(KN03_IO_INR_SCC0) } },
+ { { .i = IO_IRQ_MASK(KN03_IO_INR_SCC1) },
+ { .i = IO_IRQ_NR(KN03_IO_INR_SCC1) } },
+ { { .i = IO_IRQ_MASK(KN03_IO_INR_ASC) },
+ { .i = IO_IRQ_NR(KN03_IO_INR_ASC) } },
+ { { .i = IO_IRQ_MASK(KN03_IO_INR_LANCE) },
+ { .i = IO_IRQ_NR(KN03_IO_INR_LANCE) } },
+ { { .i = IO_IRQ_MASK(KN03_IO_INR_TC2) },
+ { .i = IO_IRQ_NR(KN03_IO_INR_TC2) } },
+ { { .i = IO_IRQ_MASK(KN03_IO_INR_TC1) },
+ { .i = IO_IRQ_NR(KN03_IO_INR_TC1) } },
+ { { .i = IO_IRQ_MASK(KN03_IO_INR_TC0) },
+ { .i = IO_IRQ_NR(KN03_IO_INR_TC0) } },
+ { { .i = IO_IRQ_ALL },
+ { .p = asic_all_int } },
+};
+
+static void __init dec_init_kn03(void)
+{
+ /* IRQ routing. */
+ memcpy(&dec_interrupt, &kn03_interrupt,
+ sizeof(kn03_interrupt));
+
+ /* CPU IRQ priorities. */
+ memcpy(&cpu_mask_nr_tbl, &kn03_cpu_mask_nr_tbl,
+ sizeof(kn03_cpu_mask_nr_tbl));
+
+ /* I/O ASIC IRQ priorities. */
+ memcpy(&asic_mask_nr_tbl, &kn03_asic_mask_nr_tbl,
+ sizeof(kn03_asic_mask_nr_tbl));
+
+ mips_cpu_irq_init();
+ init_ioasic_irqs(IO_IRQ_BASE);
+
+} /* dec_init_kn03 */
+
+
+void __init arch_init_irq(void)
+{
+ switch (mips_machtype) {
+ case MACH_DS23100: /* DS2100/DS3100 Pmin/Pmax */
+ dec_init_kn01();
+ break;
+ case MACH_DS5100: /* DS5100 MIPSmate */
+ dec_init_kn230();
+ break;
+ case MACH_DS5000_200: /* DS5000/200 3max */
+ dec_init_kn02();
+ break;
+ case MACH_DS5000_1XX: /* DS5000/1xx 3min */
+ dec_init_kn02ba();
+ break;
+ case MACH_DS5000_2X0: /* DS5000/240 3max+ */
+ case MACH_DS5900: /* DS5900 bigmax */
+ dec_init_kn03();
+ break;
+ case MACH_DS5000_XX: /* Personal DS5000/xx */
+ dec_init_kn02ca();
+ break;
+ case MACH_DS5800: /* DS5800 Isis */
+ panic("Don't know how to set this up!");
+ break;
+ case MACH_DS5400: /* DS5400 MIPSfair */
+ panic("Don't know how to set this up!");
+ break;
+ case MACH_DS5500: /* DS5500 MIPSfair-2 */
+ panic("Don't know how to set this up!");
+ break;
+ }
+
+ /* Free the FPU interrupt if the exception is present. */
+ if (!cpu_has_nofpuex) {
+ cpu_fpu_mask = 0;
+ dec_interrupt[DEC_IRQ_FPU] = -1;
+ }
+ /* Free the halt interrupt unused on R4k systems. */
+ if (current_cpu_type() == CPU_R4000SC ||
+ current_cpu_type() == CPU_R4400SC)
+ dec_interrupt[DEC_IRQ_HALT] = -1;
+
+ /* Register board interrupts: FPU and cascade. */
+ if (IS_ENABLED(CONFIG_MIPS_FP_SUPPORT) &&
+ dec_interrupt[DEC_IRQ_FPU] >= 0 && cpu_has_fpu) {
+ struct irq_desc *desc_fpu;
+ int irq_fpu;
+
+ irq_fpu = dec_interrupt[DEC_IRQ_FPU];
+ if (request_irq(irq_fpu, no_action, IRQF_NO_THREAD, "fpu",
+ NULL))
+ pr_err("Failed to register fpu interrupt\n");
+ desc_fpu = irq_to_desc(irq_fpu);
+ fpu_kstat_irq = this_cpu_ptr(desc_fpu->kstat_irqs);
+ }
+ if (dec_interrupt[DEC_IRQ_CASCADE] >= 0) {
+ if (request_irq(dec_interrupt[DEC_IRQ_CASCADE], no_action,
+ IRQF_NO_THREAD, "cascade", NULL))
+ pr_err("Failed to register cascade interrupt\n");
+ }
+ /* Register the bus error interrupt. */
+ if (dec_interrupt[DEC_IRQ_BUS] >= 0 && busirq_handler) {
+ if (request_irq(dec_interrupt[DEC_IRQ_BUS], busirq_handler,
+ busirq_flags, "bus error", busirq_handler))
+ pr_err("Failed to register bus error interrupt\n");
+ }
+ /* Register the HALT interrupt. */
+ if (dec_interrupt[DEC_IRQ_HALT] >= 0) {
+ if (request_irq(dec_interrupt[DEC_IRQ_HALT], dec_intr_halt,
+ IRQF_NO_THREAD, "halt", NULL))
+ pr_err("Failed to register halt interrupt\n");
+ }
+}
+
+asmlinkage unsigned int dec_irq_dispatch(unsigned int irq)
+{
+ do_IRQ(irq);
+ return 0;
+}
diff --git a/arch/mips/dec/tc.c b/arch/mips/dec/tc.c
new file mode 100644
index 0000000000..dba5839766
--- /dev/null
+++ b/arch/mips/dec/tc.c
@@ -0,0 +1,95 @@
+/*
+ * TURBOchannel architecture calls.
+ *
+ * Copyright (c) Harald Koerfgen, 1998
+ * Copyright (c) 2001, 2003, 2005, 2006 Maciej W. Rozycki
+ * Copyright (c) 2005 James Simmons
+ *
+ * This file is subject to the terms and conditions of the GNU
+ * General Public License. See the file "COPYING" in the main
+ * directory of this archive for more details.
+ */
+#include <linux/compiler.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/string.h>
+#include <linux/tc.h>
+#include <linux/types.h>
+
+#include <asm/addrspace.h>
+#include <asm/bootinfo.h>
+#include <asm/paccess.h>
+
+#include <asm/dec/interrupts.h>
+#include <asm/dec/prom.h>
+#include <asm/dec/system.h>
+
+/*
+ * Protected read byte from TURBOchannel slot space.
+ */
+int tc_preadb(u8 *valp, void __iomem *addr)
+{
+ return get_dbe(*valp, (u8 *)addr);
+}
+
+/*
+ * Get TURBOchannel bus information as specified by the spec, plus
+ * the slot space base address and the number of slots.
+ */
+int __init tc_bus_get_info(struct tc_bus *tbus)
+{
+ if (!dec_tc_bus)
+ return -ENXIO;
+
+ memcpy(&tbus->info, rex_gettcinfo(), sizeof(tbus->info));
+ tbus->slot_base = CPHYSADDR((long)rex_slot_address(0));
+
+ switch (mips_machtype) {
+ case MACH_DS5000_200:
+ tbus->num_tcslots = 7;
+ break;
+ case MACH_DS5000_2X0:
+ case MACH_DS5900:
+ tbus->ext_slot_base = 0x20000000;
+ tbus->ext_slot_size = 0x20000000;
+ fallthrough;
+ case MACH_DS5000_1XX:
+ tbus->num_tcslots = 3;
+ break;
+ case MACH_DS5000_XX:
+ tbus->num_tcslots = 2;
+ default:
+ break;
+ }
+ return 0;
+}
+
+/*
+ * Get the IRQ for the specified slot.
+ */
+void __init tc_device_get_irq(struct tc_dev *tdev)
+{
+ switch (tdev->slot) {
+ case 0:
+ tdev->interrupt = dec_interrupt[DEC_IRQ_TC0];
+ break;
+ case 1:
+ tdev->interrupt = dec_interrupt[DEC_IRQ_TC1];
+ break;
+ case 2:
+ tdev->interrupt = dec_interrupt[DEC_IRQ_TC2];
+ break;
+ /*
+ * Yuck! DS5000/200 onboard devices
+ */
+ case 5:
+ tdev->interrupt = dec_interrupt[DEC_IRQ_TC5];
+ break;
+ case 6:
+ tdev->interrupt = dec_interrupt[DEC_IRQ_TC6];
+ break;
+ default:
+ tdev->interrupt = -1;
+ break;
+ }
+}
diff --git a/arch/mips/dec/time.c b/arch/mips/dec/time.c
new file mode 100644
index 0000000000..c38686f89a
--- /dev/null
+++ b/arch/mips/dec/time.c
@@ -0,0 +1,172 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 1991, 1992, 1995 Linus Torvalds
+ * Copyright (C) 2000, 2003 Maciej W. Rozycki
+ *
+ * This file contains the time handling details for PC-style clocks as
+ * found in some MIPS systems.
+ *
+ */
+#include <linux/bcd.h>
+#include <linux/init.h>
+#include <linux/mc146818rtc.h>
+#include <linux/param.h>
+
+#include <asm/cpu-features.h>
+#include <asm/ds1287.h>
+#include <asm/time.h>
+#include <asm/dec/interrupts.h>
+#include <asm/dec/ioasic.h>
+#include <asm/dec/machtype.h>
+
+void read_persistent_clock64(struct timespec64 *ts)
+{
+ unsigned int year, mon, day, hour, min, sec, real_year;
+ unsigned long flags;
+
+ spin_lock_irqsave(&rtc_lock, flags);
+
+ do {
+ sec = CMOS_READ(RTC_SECONDS);
+ min = CMOS_READ(RTC_MINUTES);
+ hour = CMOS_READ(RTC_HOURS);
+ day = CMOS_READ(RTC_DAY_OF_MONTH);
+ mon = CMOS_READ(RTC_MONTH);
+ year = CMOS_READ(RTC_YEAR);
+ /*
+ * The PROM will reset the year to either '72 or '73.
+ * Therefore we store the real year separately, in one
+ * of unused BBU RAM locations.
+ */
+ real_year = CMOS_READ(RTC_DEC_YEAR);
+ } while (sec != CMOS_READ(RTC_SECONDS));
+
+ spin_unlock_irqrestore(&rtc_lock, flags);
+
+ if (!(CMOS_READ(RTC_CONTROL) & RTC_DM_BINARY) || RTC_ALWAYS_BCD) {
+ sec = bcd2bin(sec);
+ min = bcd2bin(min);
+ hour = bcd2bin(hour);
+ day = bcd2bin(day);
+ mon = bcd2bin(mon);
+ year = bcd2bin(year);
+ }
+
+ year += real_year - 72 + 2000;
+
+ ts->tv_sec = mktime64(year, mon, day, hour, min, sec);
+ ts->tv_nsec = 0;
+}
+
+/*
+ * In order to set the CMOS clock precisely, update_persistent_clock64 has to
+ * be called 500 ms after the second nowtime has started, because when
+ * nowtime is written into the registers of the CMOS clock, it will
+ * jump to the next second precisely 500 ms later. Check the Dallas
+ * DS1287 data sheet for details.
+ */
+int update_persistent_clock64(struct timespec64 now)
+{
+ time64_t nowtime = now.tv_sec;
+ int retval = 0;
+ int real_seconds, real_minutes, cmos_minutes;
+ unsigned char save_control, save_freq_select;
+
+ /* irq are locally disabled here */
+ spin_lock(&rtc_lock);
+ /* tell the clock it's being set */
+ save_control = CMOS_READ(RTC_CONTROL);
+ CMOS_WRITE((save_control | RTC_SET), RTC_CONTROL);
+
+ /* stop and reset prescaler */
+ save_freq_select = CMOS_READ(RTC_FREQ_SELECT);
+ CMOS_WRITE((save_freq_select | RTC_DIV_RESET2), RTC_FREQ_SELECT);
+
+ cmos_minutes = CMOS_READ(RTC_MINUTES);
+ if (!(save_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD)
+ cmos_minutes = bcd2bin(cmos_minutes);
+
+ /*
+ * since we're only adjusting minutes and seconds,
+ * don't interfere with hour overflow. This avoids
+ * messing with unknown time zones but requires your
+ * RTC not to be off by more than 15 minutes
+ */
+ real_minutes = div_s64_rem(nowtime, 60, &real_seconds);
+ if (((abs(real_minutes - cmos_minutes) + 15) / 30) & 1)
+ real_minutes += 30; /* correct for half hour time zone */
+ real_minutes %= 60;
+
+ if (abs(real_minutes - cmos_minutes) < 30) {
+ if (!(save_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD) {
+ real_seconds = bin2bcd(real_seconds);
+ real_minutes = bin2bcd(real_minutes);
+ }
+ CMOS_WRITE(real_seconds, RTC_SECONDS);
+ CMOS_WRITE(real_minutes, RTC_MINUTES);
+ } else {
+ printk_once(KERN_NOTICE
+ "set_rtc_mmss: can't update from %d to %d\n",
+ cmos_minutes, real_minutes);
+ retval = -1;
+ }
+
+ /* The following flags have to be released exactly in this order,
+ * otherwise the DS1287 will not reset the oscillator and will not
+ * update precisely 500 ms later. You won't find this mentioned
+ * in the Dallas Semiconductor data sheets, but who believes data
+ * sheets anyway ... -- Markus Kuhn
+ */
+ CMOS_WRITE(save_control, RTC_CONTROL);
+ CMOS_WRITE(save_freq_select, RTC_FREQ_SELECT);
+ spin_unlock(&rtc_lock);
+
+ return retval;
+}
+
+void __init plat_time_init(void)
+{
+ int ioasic_clock = 0;
+ u32 start, end;
+ int i = HZ / 8;
+
+ /* Set up the rate of periodic DS1287 interrupts. */
+ ds1287_set_base_clock(HZ);
+
+ /* On some I/O ASIC systems we have the I/O ASIC's counter. */
+ if (IOASIC)
+ ioasic_clock = dec_ioasic_clocksource_init() == 0;
+ if (cpu_has_counter) {
+ ds1287_timer_state();
+ while (!ds1287_timer_state())
+ ;
+
+ start = read_c0_count();
+
+ while (i--)
+ while (!ds1287_timer_state())
+ ;
+
+ end = read_c0_count();
+
+ mips_hpt_frequency = (end - start) * 8;
+ printk(KERN_INFO "MIPS counter frequency %dHz\n",
+ mips_hpt_frequency);
+
+ /*
+ * All R4k DECstations suffer from the CP0 Count erratum,
+ * so we can't use the timer as a clock source, and a clock
+ * event both at a time. An accurate wall clock is more
+ * important than a high-precision interval timer so only
+ * use the timer as a clock source, and not a clock event
+ * if there's no I/O ASIC counter available to serve as a
+ * clock source.
+ */
+ if (!ioasic_clock) {
+ init_r4k_clocksource();
+ mips_hpt_frequency = 0;
+ }
+ }
+
+ ds1287_clockevent_init(dec_interrupt[DEC_IRQ_RTC]);
+}
diff --git a/arch/mips/dec/wbflush.c b/arch/mips/dec/wbflush.c
new file mode 100644
index 0000000000..dad64d1789
--- /dev/null
+++ b/arch/mips/dec/wbflush.c
@@ -0,0 +1,92 @@
+/*
+ * Setup the right wbflush routine for the different DECstations.
+ *
+ * Created with information from:
+ * DECstation 3100 Desktop Workstation Functional Specification
+ * DECstation 5000/200 KN02 System Module Functional Specification
+ * mipsel-linux-objdump --disassemble vmunix | grep "wbflush" :-)
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 1998 Harald Koerfgen
+ * Copyright (C) 2002 Maciej W. Rozycki
+ */
+
+#include <linux/export.h>
+#include <linux/init.h>
+
+#include <asm/bootinfo.h>
+#include <asm/wbflush.h>
+#include <asm/barrier.h>
+
+static void wbflush_kn01(void);
+static void wbflush_kn210(void);
+static void wbflush_mips(void);
+
+void (*__wbflush) (void);
+
+void __init wbflush_setup(void)
+{
+ switch (mips_machtype) {
+ case MACH_DS23100:
+ case MACH_DS5000_200: /* DS5000 3max */
+ __wbflush = wbflush_kn01;
+ break;
+ case MACH_DS5100: /* DS5100 MIPSMATE */
+ __wbflush = wbflush_kn210;
+ break;
+ case MACH_DS5000_1XX: /* DS5000/100 3min */
+ case MACH_DS5000_XX: /* Personal DS5000/2x */
+ case MACH_DS5000_2X0: /* DS5000/240 3max+ */
+ case MACH_DS5900: /* DS5900 bigmax */
+ default:
+ __wbflush = wbflush_mips;
+ break;
+ }
+}
+
+/*
+ * For the DS3100 and DS5000/200 the R2020/R3220 writeback buffer functions
+ * as part of Coprocessor 0.
+ */
+static void wbflush_kn01(void)
+{
+ asm(".set\tpush\n\t"
+ ".set\tnoreorder\n\t"
+ "1:\tbc0f\t1b\n\t"
+ "nop\n\t"
+ ".set\tpop");
+}
+
+/*
+ * For the DS5100 the writeback buffer seems to be a part of Coprocessor 3.
+ * But CP3 has to enabled first.
+ */
+static void wbflush_kn210(void)
+{
+ asm(".set\tpush\n\t"
+ ".set\tnoreorder\n\t"
+ "mfc0\t$2,$12\n\t"
+ "lui\t$3,0x8000\n\t"
+ "or\t$3,$2,$3\n\t"
+ "mtc0\t$3,$12\n\t"
+ "nop\n"
+ "1:\tbc3f\t1b\n\t"
+ "nop\n\t"
+ "mtc0\t$2,$12\n\t"
+ "nop\n\t"
+ ".set\tpop"
+ : : : "$2", "$3");
+}
+
+/*
+ * I/O ASIC systems use a standard writeback buffer that gets flushed
+ * upon an uncached read.
+ */
+static void wbflush_mips(void)
+{
+ __fast_iob();
+}
+EXPORT_SYMBOL(__wbflush);
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-27 09:18:16 +0000