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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /arch/alpha/kernel/sys_jensen.c
Initial import
Diffstat (limited to 'arch/alpha/kernel/sys_jensen.c')
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diff --git a/arch/alpha/kernel/sys_jensen.c b/arch/alpha/kernel/sys_jensen.c
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+/*
+ * linux/arch/alpha/kernel/sys_jensen.c
+ *
+ * Copyright (C) 1995 Linus Torvalds
+ * Copyright (C) 1998, 1999 Richard Henderson
+ *
+ * Code supporting the Jensen.
+ */
+
+#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>
+
+#define __EXTERN_INLINE inline
+#include <asm/io.h>
+#include <asm/jensen.h>
+#undef __EXTERN_INLINE
+
+#include <asm/dma.h>
+#include <asm/irq.h>
+#include <asm/mmu_context.h>
+#include <asm/pgtable.h>
+#include <asm/tlbflush.h>
+
+#include "proto.h"
+#include "irq_impl.h"
+#include "pci_impl.h"
+#include "machvec_impl.h"
+
+
+/*
+ * Jensen is special: the vector is 0x8X0 for EISA interrupt X, and
+ * 0x9X0 for the local motherboard interrupts.
+ *
+ * Note especially that those local interrupts CANNOT be masked,
+ * which causes much of the pain below...
+ *
+ * 0x660 - NMI
+ *
+ * 0x800 - IRQ0 interval timer (not used, as we use the RTC timer)
+ * 0x810 - IRQ1 line printer (duh..)
+ * 0x860 - IRQ6 floppy disk
+ *
+ * 0x900 - COM1
+ * 0x920 - COM2
+ * 0x980 - keyboard
+ * 0x990 - mouse
+ *
+ * PCI-based systems are more sane: they don't have the local
+ * interrupts at all, and have only normal PCI interrupts from
+ * devices. Happily it's easy enough to do a sane mapping from the
+ * Jensen.
+ *
+ * Note that this means that we may have to do a hardware
+ * "local_op" to a different interrupt than we report to the rest of the
+ * world.
+ */
+
+static void
+jensen_local_enable(struct irq_data *d)
+{
+ /* the parport is really hw IRQ 1, silly Jensen. */
+ if (d->irq == 7)
+ i8259a_enable_irq(d);
+}
+
+static void
+jensen_local_disable(struct irq_data *d)
+{
+ /* the parport is really hw IRQ 1, silly Jensen. */
+ if (d->irq == 7)
+ i8259a_disable_irq(d);
+}
+
+static void
+jensen_local_mask_ack(struct irq_data *d)
+{
+ /* the parport is really hw IRQ 1, silly Jensen. */
+ if (d->irq == 7)
+ i8259a_mask_and_ack_irq(d);
+}
+
+static struct irq_chip jensen_local_irq_type = {
+ .name = "LOCAL",
+ .irq_unmask = jensen_local_enable,
+ .irq_mask = jensen_local_disable,
+ .irq_mask_ack = jensen_local_mask_ack,
+};
+
+static void
+jensen_device_interrupt(unsigned long vector)
+{
+ int irq;
+
+ switch (vector) {
+ case 0x660:
+ printk("Whee.. NMI received. Probable hardware error\n");
+ printk("61=%02x, 461=%02x\n", inb(0x61), inb(0x461));
+ return;
+
+ /* local device interrupts: */
+ case 0x900: irq = 4; break; /* com1 -> irq 4 */
+ case 0x920: irq = 3; break; /* com2 -> irq 3 */
+ case 0x980: irq = 1; break; /* kbd -> irq 1 */
+ case 0x990: irq = 9; break; /* mouse -> irq 9 */
+
+ default:
+ if (vector > 0x900) {
+ printk("Unknown local interrupt %lx\n", vector);
+ return;
+ }
+
+ irq = (vector - 0x800) >> 4;
+ if (irq == 1)
+ irq = 7;
+ break;
+ }
+
+ /* If there is no handler yet... */
+ if (!irq_has_action(irq)) {
+ /* If it is a local interrupt that cannot be masked... */
+ if (vector >= 0x900)
+ {
+ /* Clear keyboard/mouse state */
+ inb(0x64);
+ inb(0x60);
+ /* Reset serial ports */
+ inb(0x3fa);
+ inb(0x2fa);
+ outb(0x0c, 0x3fc);
+ outb(0x0c, 0x2fc);
+ /* Clear NMI */
+ outb(0,0x61);
+ outb(0,0x461);
+ }
+ }
+
+#if 0
+ /* A useful bit of code to find out if an interrupt is going wild. */
+ {
+ static unsigned int last_msg = 0, last_cc = 0;
+ static int last_irq = -1, count = 0;
+ unsigned int cc;
+
+ __asm __volatile("rpcc %0" : "=r"(cc));
+ ++count;
+#define JENSEN_CYCLES_PER_SEC (150000000)
+ if (cc - last_msg > ((JENSEN_CYCLES_PER_SEC) * 3) ||
+ irq != last_irq) {
+ printk(KERN_CRIT " irq %d count %d cc %u @ %lx\n",
+ irq, count, cc-last_cc, get_irq_regs()->pc);
+ count = 0;
+ last_msg = cc;
+ last_irq = irq;
+ }
+ last_cc = cc;
+ }
+#endif
+
+ handle_irq(irq);
+}
+
+static void __init
+jensen_init_irq(void)
+{
+ init_i8259a_irqs();
+
+ irq_set_chip_and_handler(1, &jensen_local_irq_type, handle_level_irq);
+ irq_set_chip_and_handler(4, &jensen_local_irq_type, handle_level_irq);
+ irq_set_chip_and_handler(3, &jensen_local_irq_type, handle_level_irq);
+ irq_set_chip_and_handler(7, &jensen_local_irq_type, handle_level_irq);
+ irq_set_chip_and_handler(9, &jensen_local_irq_type, handle_level_irq);
+
+ common_init_isa_dma();
+}
+
+static void __init
+jensen_init_arch(void)
+{
+ struct pci_controller *hose;
+#ifdef CONFIG_PCI
+ static struct pci_dev fake_isa_bridge = { .dma_mask = 0xffffffffUL, };
+
+ isa_bridge = &fake_isa_bridge;
+#endif
+
+ /* Create a hose so that we can report i/o base addresses to
+ userland. */
+
+ pci_isa_hose = hose = alloc_pci_controller();
+ hose->io_space = &ioport_resource;
+ hose->mem_space = &iomem_resource;
+ hose->index = 0;
+
+ hose->sparse_mem_base = EISA_MEM - IDENT_ADDR;
+ hose->dense_mem_base = 0;
+ hose->sparse_io_base = EISA_IO - IDENT_ADDR;
+ hose->dense_io_base = 0;
+
+ hose->sg_isa = hose->sg_pci = NULL;
+ __direct_map_base = 0;
+ __direct_map_size = 0xffffffff;
+}
+
+static void
+jensen_machine_check(unsigned long vector, unsigned long la)
+{
+ printk(KERN_CRIT "Machine check\n");
+}
+
+/*
+ * The System Vector
+ */
+
+struct alpha_machine_vector jensen_mv __initmv = {
+ .vector_name = "Jensen",
+ DO_EV4_MMU,
+ IO_LITE(JENSEN,jensen),
+ .machine_check = jensen_machine_check,
+ .max_isa_dma_address = ALPHA_MAX_ISA_DMA_ADDRESS,
+ .rtc_port = 0x170,
+
+ .nr_irqs = 16,
+ .device_interrupt = jensen_device_interrupt,
+
+ .init_arch = jensen_init_arch,
+ .init_irq = jensen_init_irq,
+ .init_rtc = common_init_rtc,
+ .init_pci = NULL,
+ .kill_arch = NULL,
+};
+ALIAS_MV(jensen)