diff options
Diffstat (limited to 'arch/alpha/kernel/sys_sable.c')
| -rw-r--r-- | arch/alpha/kernel/sys_sable.c | 635 |
1 files changed, 635 insertions, 0 deletions
diff --git a/arch/alpha/kernel/sys_sable.c b/arch/alpha/kernel/sys_sable.c new file mode 100644 index 0000000000..930005b2f6 --- /dev/null +++ b/arch/alpha/kernel/sys_sable.c @@ -0,0 +1,635 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * linux/arch/alpha/kernel/sys_sable.c + * + * Copyright (C) 1995 David A Rusling + * Copyright (C) 1996 Jay A Estabrook + * Copyright (C) 1998, 1999 Richard Henderson + * + * Code supporting the Sable, Sable-Gamma, and Lynx systems. + */ + +#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 <asm/ptrace.h> +#include <asm/dma.h> +#include <asm/irq.h> +#include <asm/mmu_context.h> +#include <asm/io.h> +#include <asm/core_t2.h> +#include <asm/tlbflush.h> + +#include "proto.h" +#include "irq_impl.h" +#include "pci_impl.h" +#include "machvec_impl.h" + +DEFINE_SPINLOCK(sable_lynx_irq_lock); + +typedef struct irq_swizzle_struct +{ + char irq_to_mask[64]; + char mask_to_irq[64]; + + /* Note mask bit is true for DISABLED irqs. */ + unsigned long shadow_mask; + + void (*update_irq_hw)(unsigned long bit, unsigned long mask); + void (*ack_irq_hw)(unsigned long bit); + +} irq_swizzle_t; + +static irq_swizzle_t *sable_lynx_irq_swizzle; + +static void sable_lynx_init_irq(int nr_of_irqs); + +#if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_SABLE) + +/***********************************************************************/ +/* + * For SABLE, which is really baroque, we manage 40 IRQ's, but the + * hardware really only supports 24, not via normal ISA PIC, + * but cascaded custom 8259's, etc. + * 0-7 (char at 536) + * 8-15 (char at 53a) + * 16-23 (char at 53c) + * + * Summary Registers (536/53a/53c): + * + * Bit Meaning Kernel IRQ + *------------------------------------------ + * 0 PCI slot 0 34 + * 1 NCR810 (builtin) 33 + * 2 TULIP (builtin) 32 + * 3 mouse 12 + * 4 PCI slot 1 35 + * 5 PCI slot 2 36 + * 6 keyboard 1 + * 7 floppy 6 + * 8 COM2 3 + * 9 parallel port 7 + *10 EISA irq 3 - + *11 EISA irq 4 - + *12 EISA irq 5 5 + *13 EISA irq 6 - + *14 EISA irq 7 - + *15 COM1 4 + *16 EISA irq 9 9 + *17 EISA irq 10 10 + *18 EISA irq 11 11 + *19 EISA irq 12 - + *20 EISA irq 13 - + *21 EISA irq 14 14 + *22 NC 15 + *23 IIC - + */ + +static void +sable_update_irq_hw(unsigned long bit, unsigned long mask) +{ + int port = 0x537; + + if (bit >= 16) { + port = 0x53d; + mask >>= 16; + } else if (bit >= 8) { + port = 0x53b; + mask >>= 8; + } + + outb(mask, port); +} + +static void +sable_ack_irq_hw(unsigned long bit) +{ + int port, val1, val2; + + if (bit >= 16) { + port = 0x53c; + val1 = 0xE0 | (bit - 16); + val2 = 0xE0 | 4; + } else if (bit >= 8) { + port = 0x53a; + val1 = 0xE0 | (bit - 8); + val2 = 0xE0 | 3; + } else { + port = 0x536; + val1 = 0xE0 | (bit - 0); + val2 = 0xE0 | 1; + } + + outb(val1, port); /* ack the slave */ + outb(val2, 0x534); /* ack the master */ +} + +static irq_swizzle_t sable_irq_swizzle = { + { + -1, 6, -1, 8, 15, 12, 7, 9, /* pseudo PIC 0-7 */ + -1, 16, 17, 18, 3, -1, 21, 22, /* pseudo PIC 8-15 */ + -1, -1, -1, -1, -1, -1, -1, -1, /* pseudo EISA 0-7 */ + -1, -1, -1, -1, -1, -1, -1, -1, /* pseudo EISA 8-15 */ + 2, 1, 0, 4, 5, -1, -1, -1, /* pseudo PCI */ + -1, -1, -1, -1, -1, -1, -1, -1, /* */ + -1, -1, -1, -1, -1, -1, -1, -1, /* */ + -1, -1, -1, -1, -1, -1, -1, -1 /* */ + }, + { + 34, 33, 32, 12, 35, 36, 1, 6, /* mask 0-7 */ + 3, 7, -1, -1, 5, -1, -1, 4, /* mask 8-15 */ + 9, 10, 11, -1, -1, 14, 15, -1, /* mask 16-23 */ + -1, -1, -1, -1, -1, -1, -1, -1, /* */ + -1, -1, -1, -1, -1, -1, -1, -1, /* */ + -1, -1, -1, -1, -1, -1, -1, -1, /* */ + -1, -1, -1, -1, -1, -1, -1, -1, /* */ + -1, -1, -1, -1, -1, -1, -1, -1 /* */ + }, + -1, + sable_update_irq_hw, + sable_ack_irq_hw +}; + +static void __init +sable_init_irq(void) +{ + outb(-1, 0x537); /* slave 0 */ + outb(-1, 0x53b); /* slave 1 */ + outb(-1, 0x53d); /* slave 2 */ + outb(0x44, 0x535); /* enable cascades in master */ + + sable_lynx_irq_swizzle = &sable_irq_swizzle; + sable_lynx_init_irq(40); +} + +/* + * PCI Fixup configuration for ALPHA SABLE (2100). + * + * The device to slot mapping looks like: + * + * Slot Device + * 0 TULIP + * 1 SCSI + * 2 PCI-EISA bridge + * 3 none + * 4 none + * 5 none + * 6 PCI on board slot 0 + * 7 PCI on board slot 1 + * 8 PCI on board slot 2 + * + * + * This two layered interrupt approach means that we allocate IRQ 16 and + * above for PCI interrupts. The IRQ relates to which bit the interrupt + * comes in on. This makes interrupt processing much easier. + */ +/* + * NOTE: the IRQ assignments below are arbitrary, but need to be consistent + * with the values in the irq swizzling tables above. + */ + +static int +sable_map_irq(const struct pci_dev *dev, u8 slot, u8 pin) +{ + static char irq_tab[9][5] = { + /*INT INTA INTB INTC INTD */ + { 32+0, 32+0, 32+0, 32+0, 32+0}, /* IdSel 0, TULIP */ + { 32+1, 32+1, 32+1, 32+1, 32+1}, /* IdSel 1, SCSI */ + { -1, -1, -1, -1, -1}, /* IdSel 2, SIO */ + { -1, -1, -1, -1, -1}, /* IdSel 3, none */ + { -1, -1, -1, -1, -1}, /* IdSel 4, none */ + { -1, -1, -1, -1, -1}, /* IdSel 5, none */ + { 32+2, 32+2, 32+2, 32+2, 32+2}, /* IdSel 6, slot 0 */ + { 32+3, 32+3, 32+3, 32+3, 32+3}, /* IdSel 7, slot 1 */ + { 32+4, 32+4, 32+4, 32+4, 32+4} /* IdSel 8, slot 2 */ + }; + long min_idsel = 0, max_idsel = 8, irqs_per_slot = 5; + return COMMON_TABLE_LOOKUP; +} +#endif /* defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_SABLE) */ + +#if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_LYNX) + +/***********************************************************************/ +/* LYNX hardware specifics + */ +/* + * For LYNX, which is also baroque, we manage 64 IRQs, via a custom IC. + * + * Bit Meaning Kernel IRQ + *------------------------------------------ + * 0 + * 1 + * 2 + * 3 mouse 12 + * 4 + * 5 + * 6 keyboard 1 + * 7 floppy 6 + * 8 COM2 3 + * 9 parallel port 7 + *10 EISA irq 3 - + *11 EISA irq 4 - + *12 EISA irq 5 5 + *13 EISA irq 6 - + *14 EISA irq 7 - + *15 COM1 4 + *16 EISA irq 9 9 + *17 EISA irq 10 10 + *18 EISA irq 11 11 + *19 EISA irq 12 - + *20 + *21 EISA irq 14 14 + *22 EISA irq 15 15 + *23 IIC - + *24 VGA (builtin) - + *25 + *26 + *27 + *28 NCR810 (builtin) 28 + *29 + *30 + *31 + *32 PCI 0 slot 4 A primary bus 32 + *33 PCI 0 slot 4 B primary bus 33 + *34 PCI 0 slot 4 C primary bus 34 + *35 PCI 0 slot 4 D primary bus + *36 PCI 0 slot 5 A primary bus + *37 PCI 0 slot 5 B primary bus + *38 PCI 0 slot 5 C primary bus + *39 PCI 0 slot 5 D primary bus + *40 PCI 0 slot 6 A primary bus + *41 PCI 0 slot 6 B primary bus + *42 PCI 0 slot 6 C primary bus + *43 PCI 0 slot 6 D primary bus + *44 PCI 0 slot 7 A primary bus + *45 PCI 0 slot 7 B primary bus + *46 PCI 0 slot 7 C primary bus + *47 PCI 0 slot 7 D primary bus + *48 PCI 0 slot 0 A secondary bus + *49 PCI 0 slot 0 B secondary bus + *50 PCI 0 slot 0 C secondary bus + *51 PCI 0 slot 0 D secondary bus + *52 PCI 0 slot 1 A secondary bus + *53 PCI 0 slot 1 B secondary bus + *54 PCI 0 slot 1 C secondary bus + *55 PCI 0 slot 1 D secondary bus + *56 PCI 0 slot 2 A secondary bus + *57 PCI 0 slot 2 B secondary bus + *58 PCI 0 slot 2 C secondary bus + *59 PCI 0 slot 2 D secondary bus + *60 PCI 0 slot 3 A secondary bus + *61 PCI 0 slot 3 B secondary bus + *62 PCI 0 slot 3 C secondary bus + *63 PCI 0 slot 3 D secondary bus + */ + +static void +lynx_update_irq_hw(unsigned long bit, unsigned long mask) +{ + /* + * Write the AIR register on the T3/T4 with the + * address of the IC mask register (offset 0x40) + */ + *(vulp)T2_AIR = 0x40; + mb(); + *(vulp)T2_AIR; /* re-read to force write */ + mb(); + *(vulp)T2_DIR = mask; + mb(); + mb(); +} + +static void +lynx_ack_irq_hw(unsigned long bit) +{ + *(vulp)T2_VAR = (u_long) bit; + mb(); + mb(); +} + +static irq_swizzle_t lynx_irq_swizzle = { + { /* irq_to_mask */ + -1, 6, -1, 8, 15, 12, 7, 9, /* pseudo PIC 0-7 */ + -1, 16, 17, 18, 3, -1, 21, 22, /* pseudo PIC 8-15 */ + -1, -1, -1, -1, -1, -1, -1, -1, /* pseudo */ + -1, -1, -1, -1, 28, -1, -1, -1, /* pseudo */ + 32, 33, 34, 35, 36, 37, 38, 39, /* mask 32-39 */ + 40, 41, 42, 43, 44, 45, 46, 47, /* mask 40-47 */ + 48, 49, 50, 51, 52, 53, 54, 55, /* mask 48-55 */ + 56, 57, 58, 59, 60, 61, 62, 63 /* mask 56-63 */ + }, + { /* mask_to_irq */ + -1, -1, -1, 12, -1, -1, 1, 6, /* mask 0-7 */ + 3, 7, -1, -1, 5, -1, -1, 4, /* mask 8-15 */ + 9, 10, 11, -1, -1, 14, 15, -1, /* mask 16-23 */ + -1, -1, -1, -1, 28, -1, -1, -1, /* mask 24-31 */ + 32, 33, 34, 35, 36, 37, 38, 39, /* mask 32-39 */ + 40, 41, 42, 43, 44, 45, 46, 47, /* mask 40-47 */ + 48, 49, 50, 51, 52, 53, 54, 55, /* mask 48-55 */ + 56, 57, 58, 59, 60, 61, 62, 63 /* mask 56-63 */ + }, + -1, + lynx_update_irq_hw, + lynx_ack_irq_hw +}; + +static void __init +lynx_init_irq(void) +{ + sable_lynx_irq_swizzle = &lynx_irq_swizzle; + sable_lynx_init_irq(64); +} + +/* + * PCI Fixup configuration for ALPHA LYNX (2100A) + * + * The device to slot mapping looks like: + * + * Slot Device + * 0 none + * 1 none + * 2 PCI-EISA bridge + * 3 PCI-PCI bridge + * 4 NCR 810 (Demi-Lynx only) + * 5 none + * 6 PCI on board slot 4 + * 7 PCI on board slot 5 + * 8 PCI on board slot 6 + * 9 PCI on board slot 7 + * + * And behind the PPB we have: + * + * 11 PCI on board slot 0 + * 12 PCI on board slot 1 + * 13 PCI on board slot 2 + * 14 PCI on board slot 3 + */ +/* + * NOTE: the IRQ assignments below are arbitrary, but need to be consistent + * with the values in the irq swizzling tables above. + */ + +static int +lynx_map_irq(const struct pci_dev *dev, u8 slot, u8 pin) +{ + static char irq_tab[19][5] = { + /*INT INTA INTB INTC INTD */ + { -1, -1, -1, -1, -1}, /* IdSel 13, PCEB */ + { -1, -1, -1, -1, -1}, /* IdSel 14, PPB */ + { 28, 28, 28, 28, 28}, /* IdSel 15, NCR demi */ + { -1, -1, -1, -1, -1}, /* IdSel 16, none */ + { 32, 32, 33, 34, 35}, /* IdSel 17, slot 4 */ + { 36, 36, 37, 38, 39}, /* IdSel 18, slot 5 */ + { 40, 40, 41, 42, 43}, /* IdSel 19, slot 6 */ + { 44, 44, 45, 46, 47}, /* IdSel 20, slot 7 */ + { -1, -1, -1, -1, -1}, /* IdSel 22, none */ + /* The following are actually behind the PPB. */ + { -1, -1, -1, -1, -1}, /* IdSel 16 none */ + { 28, 28, 28, 28, 28}, /* IdSel 17 NCR lynx */ + { -1, -1, -1, -1, -1}, /* IdSel 18 none */ + { -1, -1, -1, -1, -1}, /* IdSel 19 none */ + { -1, -1, -1, -1, -1}, /* IdSel 20 none */ + { -1, -1, -1, -1, -1}, /* IdSel 21 none */ + { 48, 48, 49, 50, 51}, /* IdSel 22 slot 0 */ + { 52, 52, 53, 54, 55}, /* IdSel 23 slot 1 */ + { 56, 56, 57, 58, 59}, /* IdSel 24 slot 2 */ + { 60, 60, 61, 62, 63} /* IdSel 25 slot 3 */ + }; + const long min_idsel = 2, max_idsel = 20, irqs_per_slot = 5; + return COMMON_TABLE_LOOKUP; +} + +static u8 +lynx_swizzle(struct pci_dev *dev, u8 *pinp) +{ + int slot, pin = *pinp; + + if (dev->bus->number == 0) { + slot = PCI_SLOT(dev->devfn); + } + /* Check for the built-in bridge */ + else if (PCI_SLOT(dev->bus->self->devfn) == 3) { + slot = PCI_SLOT(dev->devfn) + 11; + } + else + { + /* Must be a card-based bridge. */ + do { + if (PCI_SLOT(dev->bus->self->devfn) == 3) { + slot = PCI_SLOT(dev->devfn) + 11; + break; + } + pin = pci_swizzle_interrupt_pin(dev, pin); + + /* Move up the chain of bridges. */ + dev = dev->bus->self; + /* Slot of the next bridge. */ + slot = PCI_SLOT(dev->devfn); + } while (dev->bus->self); + } + *pinp = pin; + return slot; +} + +#endif /* defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_LYNX) */ + +/***********************************************************************/ +/* GENERIC irq routines */ + +static inline void +sable_lynx_enable_irq(struct irq_data *d) +{ + unsigned long bit, mask; + + bit = sable_lynx_irq_swizzle->irq_to_mask[d->irq]; + spin_lock(&sable_lynx_irq_lock); + mask = sable_lynx_irq_swizzle->shadow_mask &= ~(1UL << bit); + sable_lynx_irq_swizzle->update_irq_hw(bit, mask); + spin_unlock(&sable_lynx_irq_lock); +#if 0 + printk("%s: mask 0x%lx bit 0x%lx irq 0x%x\n", + __func__, mask, bit, irq); +#endif +} + +static void +sable_lynx_disable_irq(struct irq_data *d) +{ + unsigned long bit, mask; + + bit = sable_lynx_irq_swizzle->irq_to_mask[d->irq]; + spin_lock(&sable_lynx_irq_lock); + mask = sable_lynx_irq_swizzle->shadow_mask |= 1UL << bit; + sable_lynx_irq_swizzle->update_irq_hw(bit, mask); + spin_unlock(&sable_lynx_irq_lock); +#if 0 + printk("%s: mask 0x%lx bit 0x%lx irq 0x%x\n", + __func__, mask, bit, irq); +#endif +} + +static void +sable_lynx_mask_and_ack_irq(struct irq_data *d) +{ + unsigned long bit, mask; + + bit = sable_lynx_irq_swizzle->irq_to_mask[d->irq]; + spin_lock(&sable_lynx_irq_lock); + mask = sable_lynx_irq_swizzle->shadow_mask |= 1UL << bit; + sable_lynx_irq_swizzle->update_irq_hw(bit, mask); + sable_lynx_irq_swizzle->ack_irq_hw(bit); + spin_unlock(&sable_lynx_irq_lock); +} + +static struct irq_chip sable_lynx_irq_type = { + .name = "SABLE/LYNX", + .irq_unmask = sable_lynx_enable_irq, + .irq_mask = sable_lynx_disable_irq, + .irq_mask_ack = sable_lynx_mask_and_ack_irq, +}; + +static void +sable_lynx_srm_device_interrupt(unsigned long vector) +{ + /* Note that the vector reported by the SRM PALcode corresponds + to the interrupt mask bits, but we have to manage via the + so-called legacy IRQs for many common devices. */ + + int bit, irq; + + bit = (vector - 0x800) >> 4; + irq = sable_lynx_irq_swizzle->mask_to_irq[bit]; +#if 0 + printk("%s: vector 0x%lx bit 0x%x irq 0x%x\n", + __func__, vector, bit, irq); +#endif + handle_irq(irq); +} + +static void __init +sable_lynx_init_irq(int nr_of_irqs) +{ + long i; + + for (i = 0; i < nr_of_irqs; ++i) { + irq_set_chip_and_handler(i, &sable_lynx_irq_type, + handle_level_irq); + irq_set_status_flags(i, IRQ_LEVEL); + } + + common_init_isa_dma(); +} + +static void __init +sable_lynx_init_pci(void) +{ + common_init_pci(); +} + +/*****************************************************************/ +/* + * The System Vectors + * + * In order that T2_HAE_ADDRESS should be a constant, we play + * these games with GAMMA_BIAS. + */ + +#if defined(CONFIG_ALPHA_GENERIC) || \ + (defined(CONFIG_ALPHA_SABLE) && !defined(CONFIG_ALPHA_GAMMA)) +#undef GAMMA_BIAS +#define GAMMA_BIAS 0 +struct alpha_machine_vector sable_mv __initmv = { + .vector_name = "Sable", + DO_EV4_MMU, + DO_DEFAULT_RTC, + DO_T2_IO, + .machine_check = t2_machine_check, + .max_isa_dma_address = ALPHA_SABLE_MAX_ISA_DMA_ADDRESS, + .min_io_address = EISA_DEFAULT_IO_BASE, + .min_mem_address = T2_DEFAULT_MEM_BASE, + + .nr_irqs = 40, + .device_interrupt = sable_lynx_srm_device_interrupt, + + .init_arch = t2_init_arch, + .init_irq = sable_init_irq, + .init_rtc = common_init_rtc, + .init_pci = sable_lynx_init_pci, + .kill_arch = t2_kill_arch, + .pci_map_irq = sable_map_irq, + .pci_swizzle = common_swizzle, + + .sys = { .t2 = { + .gamma_bias = 0 + } } +}; +ALIAS_MV(sable) +#endif /* GENERIC || (SABLE && !GAMMA) */ + +#if defined(CONFIG_ALPHA_GENERIC) || \ + (defined(CONFIG_ALPHA_SABLE) && defined(CONFIG_ALPHA_GAMMA)) +#undef GAMMA_BIAS +#define GAMMA_BIAS _GAMMA_BIAS +struct alpha_machine_vector sable_gamma_mv __initmv = { + .vector_name = "Sable-Gamma", + DO_EV5_MMU, + DO_DEFAULT_RTC, + DO_T2_IO, + .machine_check = t2_machine_check, + .max_isa_dma_address = ALPHA_SABLE_MAX_ISA_DMA_ADDRESS, + .min_io_address = EISA_DEFAULT_IO_BASE, + .min_mem_address = T2_DEFAULT_MEM_BASE, + + .nr_irqs = 40, + .device_interrupt = sable_lynx_srm_device_interrupt, + + .init_arch = t2_init_arch, + .init_irq = sable_init_irq, + .init_rtc = common_init_rtc, + .init_pci = sable_lynx_init_pci, + .kill_arch = t2_kill_arch, + .pci_map_irq = sable_map_irq, + .pci_swizzle = common_swizzle, + + .sys = { .t2 = { + .gamma_bias = _GAMMA_BIAS + } } +}; +ALIAS_MV(sable_gamma) +#endif /* GENERIC || (SABLE && GAMMA) */ + +#if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_LYNX) +#undef GAMMA_BIAS +#define GAMMA_BIAS _GAMMA_BIAS +struct alpha_machine_vector lynx_mv __initmv = { + .vector_name = "Lynx", + DO_EV4_MMU, + DO_DEFAULT_RTC, + DO_T2_IO, + .machine_check = t2_machine_check, + .max_isa_dma_address = ALPHA_SABLE_MAX_ISA_DMA_ADDRESS, + .min_io_address = EISA_DEFAULT_IO_BASE, + .min_mem_address = T2_DEFAULT_MEM_BASE, + + .nr_irqs = 64, + .device_interrupt = sable_lynx_srm_device_interrupt, + + .init_arch = t2_init_arch, + .init_irq = lynx_init_irq, + .init_rtc = common_init_rtc, + .init_pci = sable_lynx_init_pci, + .kill_arch = t2_kill_arch, + .pci_map_irq = lynx_map_irq, + .pci_swizzle = lynx_swizzle, + + .sys = { .t2 = { + .gamma_bias = _GAMMA_BIAS + } } +}; +ALIAS_MV(lynx) +#endif /* GENERIC || LYNX */ |