sys_sio.c
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上传日期:2013-04-10
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- /*
- * linux/arch/alpha/kernel/sys_sio.c
- *
- * Copyright (C) 1995 David A Rusling
- * Copyright (C) 1996 Jay A Estabrook
- * Copyright (C) 1998, 1999 Richard Henderson
- *
- * Code for all boards that route the PCI interrupts through the SIO
- * PCI/ISA bridge. This includes Noname (AXPpci33), Multia (UDB),
- * Kenetics's Platform 2000, Avanti (AlphaStation), XL, and AlphaBook1.
- */
- #include <linux/config.h>
- #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/tty.h>
- #include <asm/compiler.h>
- #include <asm/ptrace.h>
- #include <asm/system.h>
- #include <asm/dma.h>
- #include <asm/irq.h>
- #include <asm/mmu_context.h>
- #include <asm/io.h>
- #include <asm/pgtable.h>
- #include <asm/core_apecs.h>
- #include <asm/core_lca.h>
- #include "proto.h"
- #include "irq_impl.h"
- #include "pci_impl.h"
- #include "machvec_impl.h"
- static void __init
- sio_init_irq(void)
- {
- if (alpha_using_srm)
- alpha_mv.device_interrupt = srm_device_interrupt;
- init_i8259a_irqs();
- common_init_isa_dma();
- }
- static inline void __init
- alphabook1_init_arch(void)
- {
- /* The AlphaBook1 has LCD video fixed at 800x600,
- 37 rows and 100 cols. */
- screen_info.orig_y = 37;
- screen_info.orig_video_cols = 100;
- screen_info.orig_video_lines = 37;
- lca_init_arch();
- }
- /*
- * sio_route_tab selects irq routing in PCI/ISA bridge so that:
- * PIRQ0 -> irq 15
- * PIRQ1 -> irq 9
- * PIRQ2 -> irq 10
- * PIRQ3 -> irq 11
- *
- * This probably ought to be configurable via MILO. For
- * example, sound boards seem to like using IRQ 9.
- *
- * This is NOT how we should do it. PIRQ0-X should have
- * their own IRQ's, the way intel uses the IO-APIC irq's.
- */
- static void __init
- sio_pci_route(void)
- {
- pcibios_write_config_dword(0, PCI_DEVFN(7, 0), 0x60,
- alpha_mv.sys.sio.route_tab);
- }
- static unsigned int __init
- sio_collect_irq_levels(void)
- {
- unsigned int level_bits = 0;
- struct pci_dev *dev;
- /* Iterate through the devices, collecting IRQ levels. */
- pci_for_each_dev(dev) {
- if ((dev->class >> 16 == PCI_BASE_CLASS_BRIDGE) &&
- (dev->class >> 8 != PCI_CLASS_BRIDGE_PCMCIA))
- continue;
- if (dev->irq)
- level_bits |= (1 << dev->irq);
- }
- return level_bits;
- }
- static void __init
- sio_fixup_irq_levels(unsigned int level_bits)
- {
- unsigned int old_level_bits;
- /*
- * Now, make all PCI interrupts level sensitive. Notice:
- * these registers must be accessed byte-wise. inw()/outw()
- * don't work.
- *
- * Make sure to turn off any level bits set for IRQs 9,10,11,15,
- * so that the only bits getting set are for devices actually found.
- * Note that we do preserve the remainder of the bits, which we hope
- * will be set correctly by ARC/SRM.
- *
- * Note: we at least preserve any level-set bits on AlphaBook1
- */
- old_level_bits = inb(0x4d0) | (inb(0x4d1) << 8);
- level_bits |= (old_level_bits & 0x71ff);
- outb((level_bits >> 0) & 0xff, 0x4d0);
- outb((level_bits >> 8) & 0xff, 0x4d1);
- }
- static inline int __init
- noname_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
- {
- /*
- * The Noname board has 5 PCI slots with each of the 4
- * interrupt pins routed to different pins on the PCI/ISA
- * bridge (PIRQ0-PIRQ3). The table below is based on
- * information available at:
- *
- * http://ftp.digital.com/pub/DEC/axppci/ref_interrupts.txt
- *
- * I have no information on the Avanti interrupt routing, but
- * the routing seems to be identical to the Noname except
- * that the Avanti has an additional slot whose routing I'm
- * unsure of.
- *
- * pirq_tab[0] is a fake entry to deal with old PCI boards
- * that have the interrupt pin number hardwired to 0 (meaning
- * that they use the default INTA line, if they are interrupt
- * driven at all).
- */
- static char irq_tab[][5] __initdata = {
- /*INT A B C D */
- { 3, 3, 3, 3, 3}, /* idsel 6 (53c810) */
- {-1, -1, -1, -1, -1}, /* idsel 7 (SIO: PCI/ISA bridge) */
- { 2, 2, -1, -1, -1}, /* idsel 8 (Hack: slot closest ISA) */
- {-1, -1, -1, -1, -1}, /* idsel 9 (unused) */
- {-1, -1, -1, -1, -1}, /* idsel 10 (unused) */
- { 0, 0, 2, 1, 0}, /* idsel 11 KN25_PCI_SLOT0 */
- { 1, 1, 0, 2, 1}, /* idsel 12 KN25_PCI_SLOT1 */
- { 2, 2, 1, 0, 2}, /* idsel 13 KN25_PCI_SLOT2 */
- { 0, 0, 0, 0, 0}, /* idsel 14 AS255 TULIP */
- };
- const long min_idsel = 6, max_idsel = 14, irqs_per_slot = 5;
- int irq = COMMON_TABLE_LOOKUP, tmp;
- tmp = __kernel_extbl(alpha_mv.sys.sio.route_tab, irq);
- return irq >= 0 ? tmp : -1;
- }
- static inline int __init
- p2k_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
- {
- static char irq_tab[][5] __initdata = {
- /*INT A B C D */
- { 0, 0, -1, -1, -1}, /* idsel 6 (53c810) */
- {-1, -1, -1, -1, -1}, /* idsel 7 (SIO: PCI/ISA bridge) */
- { 1, 1, 2, 3, 0}, /* idsel 8 (slot A) */
- { 2, 2, 3, 0, 1}, /* idsel 9 (slot B) */
- {-1, -1, -1, -1, -1}, /* idsel 10 (unused) */
- {-1, -1, -1, -1, -1}, /* idsel 11 (unused) */
- { 3, 3, -1, -1, -1}, /* idsel 12 (CMD0646) */
- };
- const long min_idsel = 6, max_idsel = 12, irqs_per_slot = 5;
- int irq = COMMON_TABLE_LOOKUP, tmp;
- tmp = __kernel_extbl(alpha_mv.sys.sio.route_tab, irq);
- return irq >= 0 ? tmp : -1;
- }
- static inline void __init
- noname_init_pci(void)
- {
- common_init_pci();
- sio_pci_route();
- sio_fixup_irq_levels(sio_collect_irq_levels());
- ns87312_enable_ide(0x26e);
- }
- static inline void __init
- alphabook1_init_pci(void)
- {
- struct pci_dev *dev;
- unsigned char orig, config;
- common_init_pci();
- sio_pci_route();
- /*
- * On the AlphaBook1, the PCMCIA chip (Cirrus 6729)
- * is sensitive to PCI bus bursts, so we must DISABLE
- * burst mode for the NCR 8xx SCSI... :-(
- *
- * Note that the NCR810 SCSI driver must preserve the
- * setting of the bit in order for this to work. At the
- * moment (2.0.29), ncr53c8xx.c does NOT do this, but
- * 53c7,8xx.c DOES.
- */
- dev = NULL;
- while ((dev = pci_find_device(PCI_VENDOR_ID_NCR, PCI_ANY_ID, dev))) {
- if (dev->device == PCI_DEVICE_ID_NCR_53C810
- || dev->device == PCI_DEVICE_ID_NCR_53C815
- || dev->device == PCI_DEVICE_ID_NCR_53C820
- || dev->device == PCI_DEVICE_ID_NCR_53C825) {
- unsigned long io_port;
- unsigned char ctest4;
- io_port = dev->resource[0].start;
- ctest4 = inb(io_port+0x21);
- if (!(ctest4 & 0x80)) {
- printk("AlphaBook1 NCR init: setting"
- " burst disablen");
- outb(ctest4 | 0x80, io_port+0x21);
- }
- }
- }
- /* Do not set *ANY* level triggers for AlphaBook1. */
- sio_fixup_irq_levels(0);
- /* Make sure that register PR1 indicates 1Mb mem */
- outb(0x0f, 0x3ce); orig = inb(0x3cf); /* read PR5 */
- outb(0x0f, 0x3ce); outb(0x05, 0x3cf); /* unlock PR0-4 */
- outb(0x0b, 0x3ce); config = inb(0x3cf); /* read PR1 */
- if ((config & 0xc0) != 0xc0) {
- printk("AlphaBook1 VGA init: setting 1Mb memoryn");
- config |= 0xc0;
- outb(0x0b, 0x3ce); outb(config, 0x3cf); /* write PR1 */
- }
- outb(0x0f, 0x3ce); outb(orig, 0x3cf); /* (re)lock PR0-4 */
- }
- /*
- * The System Vectors
- */
- #if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_BOOK1)
- struct alpha_machine_vector alphabook1_mv __initmv = {
- vector_name: "AlphaBook1",
- DO_EV4_MMU,
- DO_DEFAULT_RTC,
- DO_LCA_IO,
- DO_LCA_BUS,
- machine_check: lca_machine_check,
- max_dma_address: ALPHA_MAX_DMA_ADDRESS,
- min_io_address: DEFAULT_IO_BASE,
- min_mem_address: APECS_AND_LCA_DEFAULT_MEM_BASE,
- nr_irqs: 16,
- device_interrupt: isa_device_interrupt,
- init_arch: alphabook1_init_arch,
- init_irq: sio_init_irq,
- init_rtc: common_init_rtc,
- init_pci: alphabook1_init_pci,
- kill_arch: NULL,
- pci_map_irq: noname_map_irq,
- pci_swizzle: common_swizzle,
- sys: { sio: {
- /* NCR810 SCSI is 14, PCMCIA controller is 15. */
- route_tab: 0x0e0f0a0a,
- }}
- };
- ALIAS_MV(alphabook1)
- #endif
- #if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_AVANTI)
- struct alpha_machine_vector avanti_mv __initmv = {
- vector_name: "Avanti",
- DO_EV4_MMU,
- DO_DEFAULT_RTC,
- DO_APECS_IO,
- DO_APECS_BUS,
- machine_check: apecs_machine_check,
- max_dma_address: ALPHA_MAX_DMA_ADDRESS,
- min_io_address: DEFAULT_IO_BASE,
- min_mem_address: APECS_AND_LCA_DEFAULT_MEM_BASE,
- nr_irqs: 16,
- device_interrupt: isa_device_interrupt,
- init_arch: apecs_init_arch,
- init_irq: sio_init_irq,
- init_rtc: common_init_rtc,
- init_pci: noname_init_pci,
- pci_map_irq: noname_map_irq,
- pci_swizzle: common_swizzle,
- sys: { sio: {
- route_tab: 0x0b0a0e0f,
- }}
- };
- ALIAS_MV(avanti)
- #endif
- #if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_NONAME)
- struct alpha_machine_vector noname_mv __initmv = {
- vector_name: "Noname",
- DO_EV4_MMU,
- DO_DEFAULT_RTC,
- DO_LCA_IO,
- DO_LCA_BUS,
- machine_check: lca_machine_check,
- max_dma_address: ALPHA_MAX_DMA_ADDRESS,
- min_io_address: DEFAULT_IO_BASE,
- min_mem_address: APECS_AND_LCA_DEFAULT_MEM_BASE,
- nr_irqs: 16,
- device_interrupt: srm_device_interrupt,
- init_arch: lca_init_arch,
- init_irq: sio_init_irq,
- init_rtc: common_init_rtc,
- init_pci: noname_init_pci,
- pci_map_irq: noname_map_irq,
- pci_swizzle: common_swizzle,
- sys: { sio: {
- /* For UDB, the only available PCI slot must not map to IRQ 9,
- since that's the builtin MSS sound chip. That PCI slot
- will map to PIRQ1 (for INTA at least), so we give it IRQ 15
- instead.
- Unfortunately we have to do this for NONAME as well, since
- they are co-indicated when the platform type "Noname" is
- selected... :-( */
- route_tab: 0x0b0a0f0d,
- }}
- };
- ALIAS_MV(noname)
- #endif
- #if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_P2K)
- struct alpha_machine_vector p2k_mv __initmv = {
- vector_name: "Platform2000",
- DO_EV4_MMU,
- DO_DEFAULT_RTC,
- DO_LCA_IO,
- DO_LCA_BUS,
- machine_check: lca_machine_check,
- max_dma_address: ALPHA_MAX_DMA_ADDRESS,
- min_io_address: DEFAULT_IO_BASE,
- min_mem_address: APECS_AND_LCA_DEFAULT_MEM_BASE,
- nr_irqs: 16,
- device_interrupt: srm_device_interrupt,
- init_arch: lca_init_arch,
- init_irq: sio_init_irq,
- init_rtc: common_init_rtc,
- init_pci: noname_init_pci,
- pci_map_irq: p2k_map_irq,
- pci_swizzle: common_swizzle,
- sys: { sio: {
- route_tab: 0x0b0a090f,
- }}
- };
- ALIAS_MV(p2k)
- #endif
- #if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_XL)
- struct alpha_machine_vector xl_mv __initmv = {
- vector_name: "XL",
- DO_EV4_MMU,
- DO_DEFAULT_RTC,
- DO_APECS_IO,
- BUS(apecs),
- machine_check: apecs_machine_check,
- max_dma_address: ALPHA_XL_MAX_DMA_ADDRESS,
- min_io_address: DEFAULT_IO_BASE,
- min_mem_address: XL_DEFAULT_MEM_BASE,
- nr_irqs: 16,
- device_interrupt: isa_device_interrupt,
- init_arch: apecs_init_arch,
- init_irq: sio_init_irq,
- init_rtc: common_init_rtc,
- init_pci: noname_init_pci,
- pci_map_irq: noname_map_irq,
- pci_swizzle: common_swizzle,
- sys: { sio: {
- route_tab: 0x0b0a090f,
- }}
- };
- ALIAS_MV(xl)
- #endif