summaryrefslogtreecommitdiff
path: root/arch/alpha/kernel/sys_sio.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/alpha/kernel/sys_sio.c')
-rw-r--r--arch/alpha/kernel/sys_sio.c438
1 files changed, 438 insertions, 0 deletions
diff --git a/arch/alpha/kernel/sys_sio.c b/arch/alpha/kernel/sys_sio.c
new file mode 100644
index 00000000000..47df48a6ddb
--- /dev/null
+++ b/arch/alpha/kernel/sys_sio.c
@@ -0,0 +1,438 @@
+/*
+ * 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 <asm/tlbflush.h>
+
+#include "proto.h"
+#include "irq_impl.h"
+#include "pci_impl.h"
+#include "machvec_impl.h"
+
+#if defined(ALPHA_RESTORE_SRM_SETUP)
+/* Save LCA configuration data as the console had it set up. */
+struct
+{
+ unsigned int orig_route_tab; /* for SAVE/RESTORE */
+} saved_config __attribute((common));
+#endif
+
+
+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)
+{
+#if defined(ALPHA_RESTORE_SRM_SETUP)
+ /* First, read and save the original setting. */
+ pci_bus_read_config_dword(pci_isa_hose->bus, PCI_DEVFN(7, 0), 0x60,
+ &saved_config.orig_route_tab);
+ printk("%s: PIRQ original 0x%x new 0x%x\n", __FUNCTION__,
+ saved_config.orig_route_tab, alpha_mv.sys.sio.route_tab);
+#endif
+
+ /* Now override with desired setting. */
+ pci_bus_write_config_dword(pci_isa_hose->bus, 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 = NULL;
+
+ /* Iterate through the devices, collecting IRQ levels. */
+ while ((dev = pci_find_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
+ 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 disable\n");
+ 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 memory\n");
+ config |= 0xc0;
+ outb(0x0b, 0x3ce); outb(config, 0x3cf); /* write PR1 */
+ }
+ outb(0x0f, 0x3ce); outb(orig, 0x3cf); /* (re)lock PR0-4 */
+}
+
+void
+sio_kill_arch(int mode)
+{
+#if defined(ALPHA_RESTORE_SRM_SETUP)
+ /* Since we cannot read the PCI DMA Window CSRs, we
+ * cannot restore them here.
+ *
+ * However, we CAN read the PIRQ route register, so restore it
+ * now...
+ */
+ pci_bus_write_config_dword(pci_isa_hose->bus, PCI_DEVFN(7, 0), 0x60,
+ saved_config.orig_route_tab);
+#endif
+}
+
+
+/*
+ * 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,
+ .machine_check = lca_machine_check,
+ .max_isa_dma_address = ALPHA_MAX_ISA_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 = sio_kill_arch,
+ .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,
+ .machine_check = apecs_machine_check,
+ .max_isa_dma_address = ALPHA_MAX_ISA_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,
+ .kill_arch = sio_kill_arch,
+ .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,
+ .machine_check = lca_machine_check,
+ .max_isa_dma_address = ALPHA_MAX_ISA_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,
+ .kill_arch = sio_kill_arch,
+ .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,
+ .machine_check = lca_machine_check,
+ .max_isa_dma_address = ALPHA_MAX_ISA_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,
+ .kill_arch = sio_kill_arch,
+ .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,
+ .machine_check = apecs_machine_check,
+ .max_isa_dma_address = ALPHA_XL_MAX_ISA_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,
+ .kill_arch = sio_kill_arch,
+ .pci_map_irq = noname_map_irq,
+ .pci_swizzle = common_swizzle,
+
+ .sys = { .sio = {
+ .route_tab = 0x0b0a090f,
+ }}
+};
+ALIAS_MV(xl)
+#endif