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-rw-r--r--arch/alpha/kernel/sys_wildfire.c341
1 files changed, 341 insertions, 0 deletions
diff --git a/arch/alpha/kernel/sys_wildfire.c b/arch/alpha/kernel/sys_wildfire.c
new file mode 100644
index 000000000..3cee05443
--- /dev/null
+++ b/arch/alpha/kernel/sys_wildfire.c
@@ -0,0 +1,341 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * linux/arch/alpha/kernel/sys_wildfire.c
+ *
+ * Wildfire support.
+ *
+ * Copyright (C) 2000 Andrea Arcangeli <andrea@suse.de> SuSE
+ */
+
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/mm.h>
+#include <linux/sched.h>
+#include <linux/pci.h>
+#include <linux/init.h>
+#include <linux/bitops.h>
+
+#include <asm/ptrace.h>
+#include <asm/dma.h>
+#include <asm/irq.h>
+#include <asm/mmu_context.h>
+#include <asm/io.h>
+#include <asm/core_wildfire.h>
+#include <asm/hwrpb.h>
+#include <asm/tlbflush.h>
+
+#include "proto.h"
+#include "irq_impl.h"
+#include "pci_impl.h"
+#include "machvec_impl.h"
+
+static unsigned long cached_irq_mask[WILDFIRE_NR_IRQS/(sizeof(long)*8)];
+
+DEFINE_SPINLOCK(wildfire_irq_lock);
+
+static int doing_init_irq_hw = 0;
+
+static void
+wildfire_update_irq_hw(unsigned int irq)
+{
+ int qbbno = (irq >> 8) & (WILDFIRE_MAX_QBB - 1);
+ int pcano = (irq >> 6) & (WILDFIRE_PCA_PER_QBB - 1);
+ wildfire_pca *pca;
+ volatile unsigned long * enable0;
+
+ if (!WILDFIRE_PCA_EXISTS(qbbno, pcano)) {
+ if (!doing_init_irq_hw) {
+ printk(KERN_ERR "wildfire_update_irq_hw:"
+ " got irq %d for non-existent PCA %d"
+ " on QBB %d.\n",
+ irq, pcano, qbbno);
+ }
+ return;
+ }
+
+ pca = WILDFIRE_pca(qbbno, pcano);
+ enable0 = (unsigned long *) &pca->pca_int[0].enable; /* ??? */
+
+ *enable0 = cached_irq_mask[qbbno * WILDFIRE_PCA_PER_QBB + pcano];
+ mb();
+ *enable0;
+}
+
+static void __init
+wildfire_init_irq_hw(void)
+{
+#if 0
+ register wildfire_pca * pca = WILDFIRE_pca(0, 0);
+ volatile unsigned long * enable0, * enable1, * enable2, *enable3;
+ volatile unsigned long * target0, * target1, * target2, *target3;
+
+ enable0 = (unsigned long *) &pca->pca_int[0].enable;
+ enable1 = (unsigned long *) &pca->pca_int[1].enable;
+ enable2 = (unsigned long *) &pca->pca_int[2].enable;
+ enable3 = (unsigned long *) &pca->pca_int[3].enable;
+
+ target0 = (unsigned long *) &pca->pca_int[0].target;
+ target1 = (unsigned long *) &pca->pca_int[1].target;
+ target2 = (unsigned long *) &pca->pca_int[2].target;
+ target3 = (unsigned long *) &pca->pca_int[3].target;
+
+ *enable0 = *enable1 = *enable2 = *enable3 = 0;
+
+ *target0 = (1UL<<8) | WILDFIRE_QBB(0);
+ *target1 = *target2 = *target3 = 0;
+
+ mb();
+
+ *enable0; *enable1; *enable2; *enable3;
+ *target0; *target1; *target2; *target3;
+
+#else
+ int i;
+
+ doing_init_irq_hw = 1;
+
+ /* Need to update only once for every possible PCA. */
+ for (i = 0; i < WILDFIRE_NR_IRQS; i+=WILDFIRE_IRQ_PER_PCA)
+ wildfire_update_irq_hw(i);
+
+ doing_init_irq_hw = 0;
+#endif
+}
+
+static void
+wildfire_enable_irq(struct irq_data *d)
+{
+ unsigned int irq = d->irq;
+
+ if (irq < 16)
+ i8259a_enable_irq(d);
+
+ spin_lock(&wildfire_irq_lock);
+ set_bit(irq, &cached_irq_mask);
+ wildfire_update_irq_hw(irq);
+ spin_unlock(&wildfire_irq_lock);
+}
+
+static void
+wildfire_disable_irq(struct irq_data *d)
+{
+ unsigned int irq = d->irq;
+
+ if (irq < 16)
+ i8259a_disable_irq(d);
+
+ spin_lock(&wildfire_irq_lock);
+ clear_bit(irq, &cached_irq_mask);
+ wildfire_update_irq_hw(irq);
+ spin_unlock(&wildfire_irq_lock);
+}
+
+static void
+wildfire_mask_and_ack_irq(struct irq_data *d)
+{
+ unsigned int irq = d->irq;
+
+ if (irq < 16)
+ i8259a_mask_and_ack_irq(d);
+
+ spin_lock(&wildfire_irq_lock);
+ clear_bit(irq, &cached_irq_mask);
+ wildfire_update_irq_hw(irq);
+ spin_unlock(&wildfire_irq_lock);
+}
+
+static struct irq_chip wildfire_irq_type = {
+ .name = "WILDFIRE",
+ .irq_unmask = wildfire_enable_irq,
+ .irq_mask = wildfire_disable_irq,
+ .irq_mask_ack = wildfire_mask_and_ack_irq,
+};
+
+static void __init
+wildfire_init_irq_per_pca(int qbbno, int pcano)
+{
+ int i, irq_bias;
+
+ irq_bias = qbbno * (WILDFIRE_PCA_PER_QBB * WILDFIRE_IRQ_PER_PCA)
+ + pcano * WILDFIRE_IRQ_PER_PCA;
+
+#if 0
+ unsigned long io_bias;
+
+ /* Only need the following for first PCI bus per PCA. */
+ io_bias = WILDFIRE_IO(qbbno, pcano<<1) - WILDFIRE_IO_BIAS;
+
+ outb(0, DMA1_RESET_REG + io_bias);
+ outb(0, DMA2_RESET_REG + io_bias);
+ outb(DMA_MODE_CASCADE, DMA2_MODE_REG + io_bias);
+ outb(0, DMA2_MASK_REG + io_bias);
+#endif
+
+#if 0
+ /* ??? Not sure how to do this, yet... */
+ init_i8259a_irqs(); /* ??? */
+#endif
+
+ for (i = 0; i < 16; ++i) {
+ if (i == 2)
+ continue;
+ irq_set_chip_and_handler(i + irq_bias, &wildfire_irq_type,
+ handle_level_irq);
+ irq_set_status_flags(i + irq_bias, IRQ_LEVEL);
+ }
+
+ irq_set_chip_and_handler(36 + irq_bias, &wildfire_irq_type,
+ handle_level_irq);
+ irq_set_status_flags(36 + irq_bias, IRQ_LEVEL);
+ for (i = 40; i < 64; ++i) {
+ irq_set_chip_and_handler(i + irq_bias, &wildfire_irq_type,
+ handle_level_irq);
+ irq_set_status_flags(i + irq_bias, IRQ_LEVEL);
+ }
+
+ if (request_irq(32 + irq_bias, no_action, 0, "isa_enable", NULL))
+ pr_err("Failed to register isa_enable interrupt\n");
+}
+
+static void __init
+wildfire_init_irq(void)
+{
+ int qbbno, pcano;
+
+#if 1
+ wildfire_init_irq_hw();
+ init_i8259a_irqs();
+#endif
+
+ for (qbbno = 0; qbbno < WILDFIRE_MAX_QBB; qbbno++) {
+ if (WILDFIRE_QBB_EXISTS(qbbno)) {
+ for (pcano = 0; pcano < WILDFIRE_PCA_PER_QBB; pcano++) {
+ if (WILDFIRE_PCA_EXISTS(qbbno, pcano)) {
+ wildfire_init_irq_per_pca(qbbno, pcano);
+ }
+ }
+ }
+ }
+}
+
+static void
+wildfire_device_interrupt(unsigned long vector)
+{
+ int irq;
+
+ irq = (vector - 0x800) >> 4;
+
+ /*
+ * bits 10-8: source QBB ID
+ * bits 7-6: PCA
+ * bits 5-0: irq in PCA
+ */
+
+ handle_irq(irq);
+ return;
+}
+
+/*
+ * PCI Fixup configuration.
+ *
+ * Summary per PCA (2 PCI or HIPPI buses):
+ *
+ * Bit Meaning
+ * 0-15 ISA
+ *
+ *32 ISA summary
+ *33 SMI
+ *34 NMI
+ *36 builtin QLogic SCSI (or slot 0 if no IO module)
+ *40 Interrupt Line A from slot 2 PCI0
+ *41 Interrupt Line B from slot 2 PCI0
+ *42 Interrupt Line C from slot 2 PCI0
+ *43 Interrupt Line D from slot 2 PCI0
+ *44 Interrupt Line A from slot 3 PCI0
+ *45 Interrupt Line B from slot 3 PCI0
+ *46 Interrupt Line C from slot 3 PCI0
+ *47 Interrupt Line D from slot 3 PCI0
+ *
+ *48 Interrupt Line A from slot 4 PCI1
+ *49 Interrupt Line B from slot 4 PCI1
+ *50 Interrupt Line C from slot 4 PCI1
+ *51 Interrupt Line D from slot 4 PCI1
+ *52 Interrupt Line A from slot 5 PCI1
+ *53 Interrupt Line B from slot 5 PCI1
+ *54 Interrupt Line C from slot 5 PCI1
+ *55 Interrupt Line D from slot 5 PCI1
+ *56 Interrupt Line A from slot 6 PCI1
+ *57 Interrupt Line B from slot 6 PCI1
+ *58 Interrupt Line C from slot 6 PCI1
+ *50 Interrupt Line D from slot 6 PCI1
+ *60 Interrupt Line A from slot 7 PCI1
+ *61 Interrupt Line B from slot 7 PCI1
+ *62 Interrupt Line C from slot 7 PCI1
+ *63 Interrupt Line D from slot 7 PCI1
+ *
+ *
+ * IdSel
+ * 0 Cypress Bridge I/O (ISA summary interrupt)
+ * 1 64 bit PCI 0 option slot 1 (SCSI QLogic builtin)
+ * 2 64 bit PCI 0 option slot 2
+ * 3 64 bit PCI 0 option slot 3
+ * 4 64 bit PCI 1 option slot 4
+ * 5 64 bit PCI 1 option slot 5
+ * 6 64 bit PCI 1 option slot 6
+ * 7 64 bit PCI 1 option slot 7
+ */
+
+static int
+wildfire_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
+{
+ static char irq_tab[8][5] = {
+ /*INT INTA INTB INTC INTD */
+ { -1, -1, -1, -1, -1}, /* IdSel 0 ISA Bridge */
+ { 36, 36, 36+1, 36+2, 36+3}, /* IdSel 1 SCSI builtin */
+ { 40, 40, 40+1, 40+2, 40+3}, /* IdSel 2 PCI 0 slot 2 */
+ { 44, 44, 44+1, 44+2, 44+3}, /* IdSel 3 PCI 0 slot 3 */
+ { 48, 48, 48+1, 48+2, 48+3}, /* IdSel 4 PCI 1 slot 4 */
+ { 52, 52, 52+1, 52+2, 52+3}, /* IdSel 5 PCI 1 slot 5 */
+ { 56, 56, 56+1, 56+2, 56+3}, /* IdSel 6 PCI 1 slot 6 */
+ { 60, 60, 60+1, 60+2, 60+3}, /* IdSel 7 PCI 1 slot 7 */
+ };
+ long min_idsel = 0, max_idsel = 7, irqs_per_slot = 5;
+
+ struct pci_controller *hose = dev->sysdata;
+ int irq = COMMON_TABLE_LOOKUP;
+
+ if (irq > 0) {
+ int qbbno = hose->index >> 3;
+ int pcano = (hose->index >> 1) & 3;
+ irq += (qbbno << 8) + (pcano << 6);
+ }
+ return irq;
+}
+
+
+/*
+ * The System Vectors
+ */
+
+struct alpha_machine_vector wildfire_mv __initmv = {
+ .vector_name = "WILDFIRE",
+ DO_EV6_MMU,
+ DO_DEFAULT_RTC,
+ DO_WILDFIRE_IO,
+ .machine_check = wildfire_machine_check,
+ .max_isa_dma_address = ALPHA_MAX_ISA_DMA_ADDRESS,
+ .min_io_address = DEFAULT_IO_BASE,
+ .min_mem_address = DEFAULT_MEM_BASE,
+
+ .nr_irqs = WILDFIRE_NR_IRQS,
+ .device_interrupt = wildfire_device_interrupt,
+
+ .init_arch = wildfire_init_arch,
+ .init_irq = wildfire_init_irq,
+ .init_rtc = common_init_rtc,
+ .init_pci = common_init_pci,
+ .kill_arch = wildfire_kill_arch,
+ .pci_map_irq = wildfire_map_irq,
+ .pci_swizzle = common_swizzle,
+};
+ALIAS_MV(wildfire)
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-08 19:26:51 +0000