sys_cabriolet.c
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上传日期:2013-02-24
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- /*
- * linux/arch/alpha/kernel/sys_cabriolet.c
- *
- * Copyright (C) 1995 David A Rusling
- * Copyright (C) 1996 Jay A Estabrook
- * Copyright (C) 1998, 1999, 2000 Richard Henderson
- *
- * Code supporting the Cabriolet (AlphaPC64), EB66+, and EB164,
- * PC164 and LX164.
- */
- #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 <asm/ptrace.h>
- #include <asm/system.h>
- #include <asm/dma.h>
- #include <asm/irq.h>
- #include <asm/bitops.h>
- #include <asm/mmu_context.h>
- #include <asm/io.h>
- #include <asm/pgtable.h>
- #include <asm/core_apecs.h>
- #include <asm/core_cia.h>
- #include <asm/core_lca.h>
- #include "proto.h"
- #include "irq_impl.h"
- #include "pci_impl.h"
- #include "machvec_impl.h"
- /* Note mask bit is true for DISABLED irqs. */
- static unsigned long cached_irq_mask = ~0UL;
- static inline void
- cabriolet_update_irq_hw(unsigned int irq, unsigned long mask)
- {
- int ofs = (irq - 16) / 8;
- outb(mask >> (16 + ofs * 8), 0x804 + ofs);
- }
- static inline void
- cabriolet_enable_irq(unsigned int irq)
- {
- cabriolet_update_irq_hw(irq, cached_irq_mask &= ~(1UL << irq));
- }
- static void
- cabriolet_disable_irq(unsigned int irq)
- {
- cabriolet_update_irq_hw(irq, cached_irq_mask |= 1UL << irq);
- }
- static unsigned int
- cabriolet_startup_irq(unsigned int irq)
- {
- cabriolet_enable_irq(irq);
- return 0; /* never anything pending */
- }
- static void
- cabriolet_end_irq(unsigned int irq)
- {
- if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
- cabriolet_enable_irq(irq);
- }
- static struct hw_interrupt_type cabriolet_irq_type = {
- typename: "CABRIOLET",
- startup: cabriolet_startup_irq,
- shutdown: cabriolet_disable_irq,
- enable: cabriolet_enable_irq,
- disable: cabriolet_disable_irq,
- ack: cabriolet_disable_irq,
- end: cabriolet_end_irq,
- };
- static void
- cabriolet_device_interrupt(unsigned long v, struct pt_regs *r)
- {
- unsigned long pld;
- unsigned int i;
- /* Read the interrupt summary registers */
- pld = inb(0x804) | (inb(0x805) << 8) | (inb(0x806) << 16);
- /*
- * Now for every possible bit set, work through them and call
- * the appropriate interrupt handler.
- */
- while (pld) {
- i = ffz(~pld);
- pld &= pld - 1; /* clear least bit set */
- if (i == 4) {
- isa_device_interrupt(v, r);
- } else {
- handle_irq(16 + i, r);
- }
- }
- }
- static void __init
- common_init_irq(void (*srm_dev_int)(unsigned long v, struct pt_regs *r))
- {
- init_i8259a_irqs();
- if (alpha_using_srm) {
- alpha_mv.device_interrupt = srm_dev_int;
- init_srm_irqs(35, 0);
- }
- else {
- long i;
- outb(0xff, 0x804);
- outb(0xff, 0x805);
- outb(0xff, 0x806);
- for (i = 16; i < 35; ++i) {
- irq_desc[i].status = IRQ_DISABLED | IRQ_LEVEL;
- irq_desc[i].handler = &cabriolet_irq_type;
- }
- }
- common_init_isa_dma();
- setup_irq(16+4, &isa_cascade_irqaction);
- }
- static void __init
- cabriolet_init_irq(void)
- {
- common_init_irq(srm_device_interrupt);
- }
- #if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_PC164)
- /* In theory, the PC164 has the same interrupt hardware as the other
- Cabriolet based systems. However, something got screwed up late
- in the development cycle which broke the interrupt masking hardware.
- Repeat, it is not possible to mask and ack interrupts. At all.
- In an attempt to work around this, while processing interrupts,
- we do not allow the IPL to drop below what it is currently. This
- prevents the possibility of recursion.
- ??? Another option might be to force all PCI devices to use edge
- triggered rather than level triggered interrupts. That might be
- too invasive though. */
- static void
- pc164_srm_device_interrupt(unsigned long v, struct pt_regs *r)
- {
- __min_ipl = getipl();
- srm_device_interrupt(v, r);
- __min_ipl = 0;
- }
- static void
- pc164_device_interrupt(unsigned long v, struct pt_regs *r)
- {
- __min_ipl = getipl();
- cabriolet_device_interrupt(v, r);
- __min_ipl = 0;
- }
- static void __init
- pc164_init_irq(void)
- {
- common_init_irq(pc164_srm_device_interrupt);
- }
- #endif
- /*
- * The EB66+ is very similar to the EB66 except that it does not have
- * the on-board NCR and Tulip chips. In the code below, I have used
- * slot number to refer to the id select line and *not* the slot
- * number used in the EB66+ documentation. However, in the table,
- * I've given the slot number, the id select line and the Jxx number
- * that's printed on the board. The interrupt pins from the PCI slots
- * are wired into 3 interrupt summary registers at 0x804, 0x805 and
- * 0x806 ISA.
- *
- * In the table, -1 means don't assign an IRQ number. This is usually
- * because it is the Saturn IO (SIO) PCI/ISA Bridge Chip.
- */
- static inline int __init
- eb66p_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
- {
- static char irq_tab[5][5] __initdata = {
- /*INT INTA INTB INTC INTD */
- {16+0, 16+0, 16+5, 16+9, 16+13}, /* IdSel 6, slot 0, J25 */
- {16+1, 16+1, 16+6, 16+10, 16+14}, /* IdSel 7, slot 1, J26 */
- { -1, -1, -1, -1, -1}, /* IdSel 8, SIO */
- {16+2, 16+2, 16+7, 16+11, 16+15}, /* IdSel 9, slot 2, J27 */
- {16+3, 16+3, 16+8, 16+12, 16+6} /* IdSel 10, slot 3, J28 */
- };
- const long min_idsel = 6, max_idsel = 10, irqs_per_slot = 5;
- return COMMON_TABLE_LOOKUP;
- }
- /*
- * The AlphaPC64 is very similar to the EB66+ except that its slots
- * are numbered differently. In the code below, I have used slot
- * number to refer to the id select line and *not* the slot number
- * used in the AlphaPC64 documentation. However, in the table, I've
- * given the slot number, the id select line and the Jxx number that's
- * printed on the board. The interrupt pins from the PCI slots are
- * wired into 3 interrupt summary registers at 0x804, 0x805 and 0x806
- * ISA.
- *
- * In the table, -1 means don't assign an IRQ number. This is usually
- * because it is the Saturn IO (SIO) PCI/ISA Bridge Chip.
- */
- static inline int __init
- cabriolet_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
- {
- static char irq_tab[5][5] __initdata = {
- /*INT INTA INTB INTC INTD */
- { 16+2, 16+2, 16+7, 16+11, 16+15}, /* IdSel 5, slot 2, J21 */
- { 16+0, 16+0, 16+5, 16+9, 16+13}, /* IdSel 6, slot 0, J19 */
- { 16+1, 16+1, 16+6, 16+10, 16+14}, /* IdSel 7, slot 1, J20 */
- { -1, -1, -1, -1, -1}, /* IdSel 8, SIO */
- { 16+3, 16+3, 16+8, 16+12, 16+16} /* IdSel 9, slot 3, J22 */
- };
- const long min_idsel = 5, max_idsel = 9, irqs_per_slot = 5;
- return COMMON_TABLE_LOOKUP;
- }
- static inline void __init
- cabriolet_init_pci(void)
- {
- common_init_pci();
- ns87312_enable_ide(0x398);
- }
- static inline void __init
- cia_cab_init_pci(void)
- {
- cia_init_pci();
- ns87312_enable_ide(0x398);
- }
- /*
- * The PC164 and LX164 have 19 PCI interrupts, four from each of the four
- * PCI slots, the SIO, PCI/IDE, and USB.
- *
- * Each of the interrupts can be individually masked. This is
- * accomplished by setting the appropriate bit in the mask register.
- * A bit is set by writing a "1" to the desired position in the mask
- * register and cleared by writing a "0". There are 3 mask registers
- * located at ISA address 804h, 805h and 806h.
- *
- * An I/O read at ISA address 804h, 805h, 806h will return the
- * state of the 11 PCI interrupts and not the state of the MASKED
- * interrupts.
- *
- * Note: A write to I/O 804h, 805h, and 806h the mask register will be
- * updated.
- *
- *
- * ISA DATA<7:0>
- * ISA +--------------------------------------------------------------+
- * ADDRESS | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
- * +==============================================================+
- * 0x804 | INTB0 | USB | IDE | SIO | INTA3 |INTA2 | INTA1 | INTA0 |
- * +--------------------------------------------------------------+
- * 0x805 | INTD0 | INTC3 | INTC2 | INTC1 | INTC0 |INTB3 | INTB2 | INTB1 |
- * +--------------------------------------------------------------+
- * 0x806 | Rsrv | Rsrv | Rsrv | Rsrv | Rsrv |INTD3 | INTD2 | INTD1 |
- * +--------------------------------------------------------------+
- * * Rsrv = reserved bits
- * Note: The mask register is write-only.
- *
- * IdSel
- * 5 32 bit PCI option slot 2
- * 6 64 bit PCI option slot 0
- * 7 64 bit PCI option slot 1
- * 8 Saturn I/O
- * 9 32 bit PCI option slot 3
- * 10 USB
- * 11 IDE
- *
- */
- static inline int __init
- alphapc164_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
- {
- static char irq_tab[7][5] __initdata = {
- /*INT INTA INTB INTC INTD */
- { 16+2, 16+2, 16+9, 16+13, 16+17}, /* IdSel 5, slot 2, J20 */
- { 16+0, 16+0, 16+7, 16+11, 16+15}, /* IdSel 6, slot 0, J29 */
- { 16+1, 16+1, 16+8, 16+12, 16+16}, /* IdSel 7, slot 1, J26 */
- { -1, -1, -1, -1, -1}, /* IdSel 8, SIO */
- { 16+3, 16+3, 16+10, 16+14, 16+18}, /* IdSel 9, slot 3, J19 */
- { 16+6, 16+6, 16+6, 16+6, 16+6}, /* IdSel 10, USB */
- { 16+5, 16+5, 16+5, 16+5, 16+5} /* IdSel 11, IDE */
- };
- const long min_idsel = 5, max_idsel = 11, irqs_per_slot = 5;
- return COMMON_TABLE_LOOKUP;
- }
- static inline void __init
- alphapc164_init_pci(void)
- {
- cia_init_pci();
- SMC93x_Init();
- }
- /*
- * The System Vector
- */
- #if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_CABRIOLET)
- struct alpha_machine_vector cabriolet_mv __initmv = {
- vector_name: "Cabriolet",
- 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: 35,
- device_interrupt: cabriolet_device_interrupt,
- init_arch: apecs_init_arch,
- init_irq: cabriolet_init_irq,
- init_rtc: common_init_rtc,
- init_pci: cabriolet_init_pci,
- kill_arch: NULL,
- pci_map_irq: cabriolet_map_irq,
- pci_swizzle: common_swizzle,
- };
- #ifndef CONFIG_ALPHA_EB64P
- ALIAS_MV(cabriolet)
- #endif
- #endif
- #if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_EB164)
- struct alpha_machine_vector eb164_mv __initmv = {
- vector_name: "EB164",
- DO_EV5_MMU,
- DO_DEFAULT_RTC,
- DO_CIA_IO,
- DO_CIA_BUS,
- machine_check: cia_machine_check,
- max_dma_address: ALPHA_MAX_DMA_ADDRESS,
- min_io_address: DEFAULT_IO_BASE,
- min_mem_address: CIA_DEFAULT_MEM_BASE,
- nr_irqs: 35,
- device_interrupt: cabriolet_device_interrupt,
- init_arch: cia_init_arch,
- init_irq: cabriolet_init_irq,
- init_rtc: common_init_rtc,
- init_pci: cia_cab_init_pci,
- pci_map_irq: cabriolet_map_irq,
- pci_swizzle: common_swizzle,
- };
- ALIAS_MV(eb164)
- #endif
- #if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_EB66P)
- struct alpha_machine_vector eb66p_mv __initmv = {
- vector_name: "EB66+",
- 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: 35,
- device_interrupt: cabriolet_device_interrupt,
- init_arch: lca_init_arch,
- init_irq: cabriolet_init_irq,
- init_rtc: common_init_rtc,
- init_pci: cabriolet_init_pci,
- pci_map_irq: eb66p_map_irq,
- pci_swizzle: common_swizzle,
- };
- ALIAS_MV(eb66p)
- #endif
- #if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_LX164)
- struct alpha_machine_vector lx164_mv __initmv = {
- vector_name: "LX164",
- DO_EV5_MMU,
- DO_DEFAULT_RTC,
- DO_PYXIS_IO,
- DO_CIA_BUS,
- machine_check: cia_machine_check,
- max_dma_address: ALPHA_MAX_DMA_ADDRESS,
- min_io_address: DEFAULT_IO_BASE,
- min_mem_address: DEFAULT_MEM_BASE,
- pci_dac_offset: PYXIS_DAC_OFFSET,
- nr_irqs: 35,
- device_interrupt: cabriolet_device_interrupt,
- init_arch: pyxis_init_arch,
- init_irq: cabriolet_init_irq,
- init_rtc: common_init_rtc,
- init_pci: alphapc164_init_pci,
- pci_map_irq: alphapc164_map_irq,
- pci_swizzle: common_swizzle,
- };
- ALIAS_MV(lx164)
- #endif
- #if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_PC164)
- struct alpha_machine_vector pc164_mv __initmv = {
- vector_name: "PC164",
- DO_EV5_MMU,
- DO_DEFAULT_RTC,
- DO_CIA_IO,
- DO_CIA_BUS,
- machine_check: cia_machine_check,
- max_dma_address: ALPHA_MAX_DMA_ADDRESS,
- min_io_address: DEFAULT_IO_BASE,
- min_mem_address: CIA_DEFAULT_MEM_BASE,
- nr_irqs: 35,
- device_interrupt: pc164_device_interrupt,
- init_arch: cia_init_arch,
- init_irq: pc164_init_irq,
- init_rtc: common_init_rtc,
- init_pci: alphapc164_init_pci,
- pci_map_irq: alphapc164_map_irq,
- pci_swizzle: common_swizzle,
- };
- ALIAS_MV(pc164)
- #endif