Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/arch/alpha/kernel/sys_jensen.c |
| 3 | * |
| 4 | * Copyright (C) 1995 Linus Torvalds |
| 5 | * Copyright (C) 1998, 1999 Richard Henderson |
| 6 | * |
| 7 | * Code supporting the Jensen. |
| 8 | */ |
| 9 | |
| 10 | #include <linux/kernel.h> |
| 11 | #include <linux/types.h> |
| 12 | #include <linux/mm.h> |
| 13 | #include <linux/sched.h> |
| 14 | #include <linux/pci.h> |
| 15 | #include <linux/init.h> |
| 16 | |
| 17 | #include <asm/ptrace.h> |
| 18 | #include <asm/system.h> |
| 19 | |
| 20 | #define __EXTERN_INLINE inline |
| 21 | #include <asm/io.h> |
| 22 | #include <asm/jensen.h> |
| 23 | #undef __EXTERN_INLINE |
| 24 | |
| 25 | #include <asm/dma.h> |
| 26 | #include <asm/irq.h> |
| 27 | #include <asm/mmu_context.h> |
| 28 | #include <asm/pgtable.h> |
| 29 | #include <asm/tlbflush.h> |
| 30 | |
| 31 | #include "proto.h" |
| 32 | #include "irq_impl.h" |
| 33 | #include "pci_impl.h" |
| 34 | #include "machvec_impl.h" |
| 35 | |
| 36 | |
| 37 | /* |
| 38 | * Jensen is special: the vector is 0x8X0 for EISA interrupt X, and |
| 39 | * 0x9X0 for the local motherboard interrupts. |
| 40 | * |
| 41 | * Note especially that those local interrupts CANNOT be masked, |
| 42 | * which causes much of the pain below... |
| 43 | * |
| 44 | * 0x660 - NMI |
| 45 | * |
| 46 | * 0x800 - IRQ0 interval timer (not used, as we use the RTC timer) |
| 47 | * 0x810 - IRQ1 line printer (duh..) |
| 48 | * 0x860 - IRQ6 floppy disk |
| 49 | * |
| 50 | * 0x900 - COM1 |
| 51 | * 0x920 - COM2 |
| 52 | * 0x980 - keyboard |
| 53 | * 0x990 - mouse |
| 54 | * |
| 55 | * PCI-based systems are more sane: they don't have the local |
| 56 | * interrupts at all, and have only normal PCI interrupts from |
| 57 | * devices. Happily it's easy enough to do a sane mapping from the |
| 58 | * Jensen. |
| 59 | * |
| 60 | * Note that this means that we may have to do a hardware |
| 61 | * "local_op" to a different interrupt than we report to the rest of the |
| 62 | * world. |
| 63 | */ |
| 64 | |
| 65 | static unsigned int |
| 66 | jensen_local_startup(unsigned int irq) |
| 67 | { |
| 68 | /* the parport is really hw IRQ 1, silly Jensen. */ |
| 69 | if (irq == 7) |
| 70 | i8259a_startup_irq(1); |
| 71 | else |
| 72 | /* |
| 73 | * For all true local interrupts, set the flag that prevents |
| 74 | * the IPL from being dropped during handler processing. |
| 75 | */ |
| 76 | if (irq_desc[irq].action) |
Thomas Gleixner | d18eced | 2006-07-01 19:29:11 -0700 | [diff] [blame] | 77 | irq_desc[irq].action->flags |= IRQF_DISABLED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | return 0; |
| 79 | } |
| 80 | |
| 81 | static void |
| 82 | jensen_local_shutdown(unsigned int irq) |
| 83 | { |
| 84 | /* the parport is really hw IRQ 1, silly Jensen. */ |
| 85 | if (irq == 7) |
| 86 | i8259a_disable_irq(1); |
| 87 | } |
| 88 | |
| 89 | static void |
| 90 | jensen_local_enable(unsigned int irq) |
| 91 | { |
| 92 | /* the parport is really hw IRQ 1, silly Jensen. */ |
| 93 | if (irq == 7) |
| 94 | i8259a_enable_irq(1); |
| 95 | } |
| 96 | |
| 97 | static void |
| 98 | jensen_local_disable(unsigned int irq) |
| 99 | { |
| 100 | /* the parport is really hw IRQ 1, silly Jensen. */ |
| 101 | if (irq == 7) |
| 102 | i8259a_disable_irq(1); |
| 103 | } |
| 104 | |
| 105 | static void |
| 106 | jensen_local_ack(unsigned int irq) |
| 107 | { |
| 108 | /* the parport is really hw IRQ 1, silly Jensen. */ |
| 109 | if (irq == 7) |
| 110 | i8259a_mask_and_ack_irq(1); |
| 111 | } |
| 112 | |
| 113 | static void |
| 114 | jensen_local_end(unsigned int irq) |
| 115 | { |
| 116 | /* the parport is really hw IRQ 1, silly Jensen. */ |
| 117 | if (irq == 7) |
| 118 | i8259a_end_irq(1); |
| 119 | } |
| 120 | |
| 121 | static struct hw_interrupt_type jensen_local_irq_type = { |
| 122 | .typename = "LOCAL", |
| 123 | .startup = jensen_local_startup, |
| 124 | .shutdown = jensen_local_shutdown, |
| 125 | .enable = jensen_local_enable, |
| 126 | .disable = jensen_local_disable, |
| 127 | .ack = jensen_local_ack, |
| 128 | .end = jensen_local_end, |
| 129 | }; |
| 130 | |
| 131 | static void |
Al Viro | 7ca56053 | 2006-10-08 14:36:08 +0100 | [diff] [blame] | 132 | jensen_device_interrupt(unsigned long vector) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | { |
| 134 | int irq; |
| 135 | |
| 136 | switch (vector) { |
| 137 | case 0x660: |
| 138 | printk("Whee.. NMI received. Probable hardware error\n"); |
| 139 | printk("61=%02x, 461=%02x\n", inb(0x61), inb(0x461)); |
| 140 | return; |
| 141 | |
| 142 | /* local device interrupts: */ |
| 143 | case 0x900: irq = 4; break; /* com1 -> irq 4 */ |
| 144 | case 0x920: irq = 3; break; /* com2 -> irq 3 */ |
| 145 | case 0x980: irq = 1; break; /* kbd -> irq 1 */ |
| 146 | case 0x990: irq = 9; break; /* mouse -> irq 9 */ |
| 147 | |
| 148 | default: |
| 149 | if (vector > 0x900) { |
| 150 | printk("Unknown local interrupt %lx\n", vector); |
| 151 | return; |
| 152 | } |
| 153 | |
| 154 | irq = (vector - 0x800) >> 4; |
| 155 | if (irq == 1) |
| 156 | irq = 7; |
| 157 | break; |
| 158 | } |
| 159 | |
| 160 | /* If there is no handler yet... */ |
| 161 | if (irq_desc[irq].action == NULL) { |
| 162 | /* If it is a local interrupt that cannot be masked... */ |
| 163 | if (vector >= 0x900) |
| 164 | { |
| 165 | /* Clear keyboard/mouse state */ |
| 166 | inb(0x64); |
| 167 | inb(0x60); |
| 168 | /* Reset serial ports */ |
| 169 | inb(0x3fa); |
| 170 | inb(0x2fa); |
| 171 | outb(0x0c, 0x3fc); |
| 172 | outb(0x0c, 0x2fc); |
| 173 | /* Clear NMI */ |
| 174 | outb(0,0x61); |
| 175 | outb(0,0x461); |
| 176 | } |
| 177 | } |
| 178 | |
| 179 | #if 0 |
| 180 | /* A useful bit of code to find out if an interrupt is going wild. */ |
| 181 | { |
| 182 | static unsigned int last_msg = 0, last_cc = 0; |
| 183 | static int last_irq = -1, count = 0; |
| 184 | unsigned int cc; |
| 185 | |
| 186 | __asm __volatile("rpcc %0" : "=r"(cc)); |
| 187 | ++count; |
| 188 | #define JENSEN_CYCLES_PER_SEC (150000000) |
| 189 | if (cc - last_msg > ((JENSEN_CYCLES_PER_SEC) * 3) || |
| 190 | irq != last_irq) { |
| 191 | printk(KERN_CRIT " irq %d count %d cc %u @ %lx\n", |
Al Viro | 7ca56053 | 2006-10-08 14:36:08 +0100 | [diff] [blame] | 192 | irq, count, cc-last_cc, get_irq_regs()->pc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | count = 0; |
| 194 | last_msg = cc; |
| 195 | last_irq = irq; |
| 196 | } |
| 197 | last_cc = cc; |
| 198 | } |
| 199 | #endif |
| 200 | |
Al Viro | 3dbb8c6 | 2006-10-08 14:37:32 +0100 | [diff] [blame] | 201 | handle_irq(irq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | } |
| 203 | |
| 204 | static void __init |
| 205 | jensen_init_irq(void) |
| 206 | { |
| 207 | init_i8259a_irqs(); |
| 208 | |
Ingo Molnar | d1bef4e | 2006-06-29 02:24:36 -0700 | [diff] [blame] | 209 | irq_desc[1].chip = &jensen_local_irq_type; |
| 210 | irq_desc[4].chip = &jensen_local_irq_type; |
| 211 | irq_desc[3].chip = &jensen_local_irq_type; |
| 212 | irq_desc[7].chip = &jensen_local_irq_type; |
| 213 | irq_desc[9].chip = &jensen_local_irq_type; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | |
| 215 | common_init_isa_dma(); |
| 216 | } |
| 217 | |
| 218 | static void __init |
| 219 | jensen_init_arch(void) |
| 220 | { |
| 221 | struct pci_controller *hose; |
| 222 | #ifdef CONFIG_PCI |
| 223 | static struct pci_dev fake_isa_bridge = { .dma_mask = 0xffffffffUL, }; |
| 224 | |
| 225 | isa_bridge = &fake_isa_bridge; |
| 226 | #endif |
| 227 | |
| 228 | /* Create a hose so that we can report i/o base addresses to |
| 229 | userland. */ |
| 230 | |
| 231 | pci_isa_hose = hose = alloc_pci_controller(); |
| 232 | hose->io_space = &ioport_resource; |
| 233 | hose->mem_space = &iomem_resource; |
| 234 | hose->index = 0; |
| 235 | |
| 236 | hose->sparse_mem_base = EISA_MEM - IDENT_ADDR; |
| 237 | hose->dense_mem_base = 0; |
| 238 | hose->sparse_io_base = EISA_IO - IDENT_ADDR; |
| 239 | hose->dense_io_base = 0; |
| 240 | |
| 241 | hose->sg_isa = hose->sg_pci = NULL; |
| 242 | __direct_map_base = 0; |
| 243 | __direct_map_size = 0xffffffff; |
| 244 | } |
| 245 | |
| 246 | static void |
Randy Dunlap | 5f0e3da | 2009-03-31 15:23:36 -0700 | [diff] [blame] | 247 | jensen_machine_check(unsigned long vector, unsigned long la) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 248 | { |
| 249 | printk(KERN_CRIT "Machine check\n"); |
| 250 | } |
| 251 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | /* |
| 253 | * The System Vector |
| 254 | */ |
| 255 | |
| 256 | struct alpha_machine_vector jensen_mv __initmv = { |
| 257 | .vector_name = "Jensen", |
| 258 | DO_EV4_MMU, |
| 259 | IO_LITE(JENSEN,jensen), |
| 260 | .machine_check = jensen_machine_check, |
| 261 | .max_isa_dma_address = ALPHA_MAX_ISA_DMA_ADDRESS, |
| 262 | .rtc_port = 0x170, |
Ivan Kokshaysky | 5f7dc5d | 2009-01-15 13:51:19 -0800 | [diff] [blame] | 263 | .rtc_get_time = common_get_rtc_time, |
| 264 | .rtc_set_time = common_set_rtc_time, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | |
| 266 | .nr_irqs = 16, |
| 267 | .device_interrupt = jensen_device_interrupt, |
| 268 | |
| 269 | .init_arch = jensen_init_arch, |
| 270 | .init_irq = jensen_init_irq, |
| 271 | .init_rtc = common_init_rtc, |
| 272 | .init_pci = NULL, |
| 273 | .kill_arch = NULL, |
| 274 | }; |
| 275 | ALIAS_MV(jensen) |