Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Basic EISA bus support for the SGI Indigo-2. |
| 3 | * |
| 4 | * (C) 2002 Pascal Dameme <netinet@freesurf.fr> |
| 5 | * and Marc Zyngier <mzyngier@freesurf.fr> |
| 6 | * |
| 7 | * This code is released under both the GPL version 2 and BSD |
| 8 | * licenses. Either license may be used. |
| 9 | * |
| 10 | * This code offers a very basic support for this EISA bus present in |
| 11 | * the SGI Indigo-2. It currently only supports PIO (forget about DMA |
| 12 | * for the time being). This is enough for a low-end ethernet card, |
| 13 | * but forget about your favorite SCSI card... |
| 14 | * |
| 15 | * TODO : |
| 16 | * - Fix bugs... |
| 17 | * - Add ISA support |
| 18 | * - Add DMA (yeah, right...). |
| 19 | * - Fix more bugs. |
| 20 | */ |
| 21 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | #include <linux/eisa.h> |
| 23 | #include <linux/types.h> |
| 24 | #include <linux/init.h> |
| 25 | #include <linux/irq.h> |
| 26 | #include <linux/kernel_stat.h> |
| 27 | #include <linux/signal.h> |
| 28 | #include <linux/sched.h> |
| 29 | #include <linux/interrupt.h> |
| 30 | #include <linux/delay.h> |
Thiemo Seufer | 37c8c64 | 2005-08-31 15:55:16 +0000 | [diff] [blame] | 31 | #include <asm/io.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | #include <asm/irq.h> |
| 33 | #include <asm/mipsregs.h> |
| 34 | #include <asm/addrspace.h> |
| 35 | #include <asm/processor.h> |
| 36 | #include <asm/sgi/ioc.h> |
| 37 | #include <asm/sgi/mc.h> |
| 38 | #include <asm/sgi/ip22.h> |
| 39 | |
Thiemo Seufer | 37c8c64 | 2005-08-31 15:55:16 +0000 | [diff] [blame] | 40 | /* I2 has four EISA slots. */ |
| 41 | #define IP22_EISA_MAX_SLOTS 4 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | #define EISA_MAX_IRQ 16 |
| 43 | |
Thiemo Seufer | 37c8c64 | 2005-08-31 15:55:16 +0000 | [diff] [blame] | 44 | #define EIU_MODE_REG 0x0001ffc0 |
| 45 | #define EIU_STAT_REG 0x0001ffc4 |
| 46 | #define EIU_PREMPT_REG 0x0001ffc8 |
| 47 | #define EIU_QUIET_REG 0x0001ffcc |
| 48 | #define EIU_INTRPT_ACK 0x00010004 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | |
Thiemo Seufer | 37c8c64 | 2005-08-31 15:55:16 +0000 | [diff] [blame] | 50 | static char __init *decode_eisa_sig(unsigned long addr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | { |
Thiemo Seufer | 37c8c64 | 2005-08-31 15:55:16 +0000 | [diff] [blame] | 52 | static char sig_str[EISA_SIG_LEN]; |
| 53 | u8 sig[4]; |
| 54 | u16 rev; |
| 55 | int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | |
Thiemo Seufer | 37c8c64 | 2005-08-31 15:55:16 +0000 | [diff] [blame] | 57 | for (i = 0; i < 4; i++) { |
| 58 | sig[i] = inb (addr + i); |
| 59 | |
| 60 | if (!i && (sig[0] & 0x80)) |
| 61 | return NULL; |
| 62 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | |
| 64 | sig_str[0] = ((sig[0] >> 2) & 0x1f) + ('A' - 1); |
| 65 | sig_str[1] = (((sig[0] & 3) << 3) | (sig[1] >> 5)) + ('A' - 1); |
| 66 | sig_str[2] = (sig[1] & 0x1f) + ('A' - 1); |
| 67 | rev = (sig[2] << 8) | sig[3]; |
| 68 | sprintf(sig_str + 3, "%04X", rev); |
| 69 | |
| 70 | return sig_str; |
| 71 | } |
| 72 | |
Ralf Baechle | 937a801 | 2006-10-07 19:44:33 +0100 | [diff] [blame] | 73 | static irqreturn_t ip22_eisa_intr(int irq, void *dev_id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | { |
| 75 | u8 eisa_irq; |
| 76 | u8 dma1, dma2; |
| 77 | |
Thiemo Seufer | 37c8c64 | 2005-08-31 15:55:16 +0000 | [diff] [blame] | 78 | eisa_irq = inb(EIU_INTRPT_ACK); |
| 79 | dma1 = inb(EISA_DMA1_STATUS); |
| 80 | dma2 = inb(EISA_DMA2_STATUS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | |
Thiemo Seufer | 37c8c64 | 2005-08-31 15:55:16 +0000 | [diff] [blame] | 82 | if (eisa_irq < EISA_MAX_IRQ) { |
Ralf Baechle | 937a801 | 2006-10-07 19:44:33 +0100 | [diff] [blame] | 83 | do_IRQ(eisa_irq); |
Thiemo Seufer | 37c8c64 | 2005-08-31 15:55:16 +0000 | [diff] [blame] | 84 | return IRQ_HANDLED; |
| 85 | } |
| 86 | |
| 87 | /* Oops, Bad Stuff Happened... */ |
| 88 | printk(KERN_ERR "eisa_irq %d out of bound\n", eisa_irq); |
| 89 | |
| 90 | outb(0x20, EISA_INT2_CTRL); |
| 91 | outb(0x20, EISA_INT1_CTRL); |
Ralf Baechle | 937a801 | 2006-10-07 19:44:33 +0100 | [diff] [blame] | 92 | |
Thiemo Seufer | 37c8c64 | 2005-08-31 15:55:16 +0000 | [diff] [blame] | 93 | return IRQ_NONE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | } |
| 95 | |
| 96 | static void enable_eisa1_irq(unsigned int irq) |
| 97 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | u8 mask; |
| 99 | |
Thiemo Seufer | 37c8c64 | 2005-08-31 15:55:16 +0000 | [diff] [blame] | 100 | mask = inb(EISA_INT1_MASK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 101 | mask &= ~((u8) (1 << irq)); |
Thiemo Seufer | 37c8c64 | 2005-08-31 15:55:16 +0000 | [diff] [blame] | 102 | outb(mask, EISA_INT1_MASK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | } |
| 104 | |
| 105 | static unsigned int startup_eisa1_irq(unsigned int irq) |
| 106 | { |
| 107 | u8 edge; |
| 108 | |
| 109 | /* Only use edge interrupts for EISA */ |
| 110 | |
Thiemo Seufer | 37c8c64 | 2005-08-31 15:55:16 +0000 | [diff] [blame] | 111 | edge = inb(EISA_INT1_EDGE_LEVEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | edge &= ~((u8) (1 << irq)); |
Thiemo Seufer | 37c8c64 | 2005-08-31 15:55:16 +0000 | [diff] [blame] | 113 | outb(edge, EISA_INT1_EDGE_LEVEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | |
| 115 | enable_eisa1_irq(irq); |
| 116 | return 0; |
| 117 | } |
| 118 | |
| 119 | static void disable_eisa1_irq(unsigned int irq) |
| 120 | { |
| 121 | u8 mask; |
| 122 | |
Thiemo Seufer | 37c8c64 | 2005-08-31 15:55:16 +0000 | [diff] [blame] | 123 | mask = inb(EISA_INT1_MASK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | mask |= ((u8) (1 << irq)); |
Thiemo Seufer | 37c8c64 | 2005-08-31 15:55:16 +0000 | [diff] [blame] | 125 | outb(mask, EISA_INT1_MASK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | } |
| 127 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 128 | static void mask_and_ack_eisa1_irq(unsigned int irq) |
| 129 | { |
| 130 | disable_eisa1_irq(irq); |
| 131 | |
Thiemo Seufer | 37c8c64 | 2005-08-31 15:55:16 +0000 | [diff] [blame] | 132 | outb(0x20, EISA_INT1_CTRL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | } |
| 134 | |
| 135 | static void end_eisa1_irq(unsigned int irq) |
| 136 | { |
| 137 | if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS))) |
| 138 | enable_eisa1_irq(irq); |
| 139 | } |
| 140 | |
Ralf Baechle | 94dee17 | 2006-07-02 14:41:42 +0100 | [diff] [blame] | 141 | static struct irq_chip ip22_eisa1_irq_type = { |
Atsushi Nemoto | 70d21cd | 2007-01-15 00:07:25 +0900 | [diff] [blame^] | 142 | .name = "IP22 EISA", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | .startup = startup_eisa1_irq, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | .ack = mask_and_ack_eisa1_irq, |
Atsushi Nemoto | 1603b5a | 2006-11-02 02:08:36 +0900 | [diff] [blame] | 145 | .mask = disable_eisa1_irq, |
| 146 | .mask_ack = mask_and_ack_eisa1_irq, |
| 147 | .unmask = enable_eisa1_irq, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | .end = end_eisa1_irq, |
| 149 | }; |
| 150 | |
| 151 | static void enable_eisa2_irq(unsigned int irq) |
| 152 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | u8 mask; |
| 154 | |
Thiemo Seufer | 37c8c64 | 2005-08-31 15:55:16 +0000 | [diff] [blame] | 155 | mask = inb(EISA_INT2_MASK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | mask &= ~((u8) (1 << (irq - 8))); |
Thiemo Seufer | 37c8c64 | 2005-08-31 15:55:16 +0000 | [diff] [blame] | 157 | outb(mask, EISA_INT2_MASK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 158 | } |
| 159 | |
| 160 | static unsigned int startup_eisa2_irq(unsigned int irq) |
| 161 | { |
| 162 | u8 edge; |
| 163 | |
| 164 | /* Only use edge interrupts for EISA */ |
| 165 | |
Thiemo Seufer | 37c8c64 | 2005-08-31 15:55:16 +0000 | [diff] [blame] | 166 | edge = inb(EISA_INT2_EDGE_LEVEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | edge &= ~((u8) (1 << (irq - 8))); |
Thiemo Seufer | 37c8c64 | 2005-08-31 15:55:16 +0000 | [diff] [blame] | 168 | outb(edge, EISA_INT2_EDGE_LEVEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 169 | |
| 170 | enable_eisa2_irq(irq); |
| 171 | return 0; |
| 172 | } |
| 173 | |
| 174 | static void disable_eisa2_irq(unsigned int irq) |
| 175 | { |
| 176 | u8 mask; |
| 177 | |
Thiemo Seufer | 37c8c64 | 2005-08-31 15:55:16 +0000 | [diff] [blame] | 178 | mask = inb(EISA_INT2_MASK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | mask |= ((u8) (1 << (irq - 8))); |
Thiemo Seufer | 37c8c64 | 2005-08-31 15:55:16 +0000 | [diff] [blame] | 180 | outb(mask, EISA_INT2_MASK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | } |
| 182 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | static void mask_and_ack_eisa2_irq(unsigned int irq) |
| 184 | { |
| 185 | disable_eisa2_irq(irq); |
| 186 | |
Thiemo Seufer | 37c8c64 | 2005-08-31 15:55:16 +0000 | [diff] [blame] | 187 | outb(0x20, EISA_INT2_CTRL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 188 | } |
| 189 | |
| 190 | static void end_eisa2_irq(unsigned int irq) |
| 191 | { |
| 192 | if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS))) |
| 193 | enable_eisa2_irq(irq); |
| 194 | } |
| 195 | |
Ralf Baechle | 94dee17 | 2006-07-02 14:41:42 +0100 | [diff] [blame] | 196 | static struct irq_chip ip22_eisa2_irq_type = { |
Atsushi Nemoto | 70d21cd | 2007-01-15 00:07:25 +0900 | [diff] [blame^] | 197 | .name = "IP22 EISA", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 198 | .startup = startup_eisa2_irq, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | .ack = mask_and_ack_eisa2_irq, |
Atsushi Nemoto | 1603b5a | 2006-11-02 02:08:36 +0900 | [diff] [blame] | 200 | .mask = disable_eisa2_irq, |
| 201 | .mask_ack = mask_and_ack_eisa2_irq, |
| 202 | .unmask = enable_eisa2_irq, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | .end = end_eisa2_irq, |
| 204 | }; |
| 205 | |
| 206 | static struct irqaction eisa_action = { |
| 207 | .handler = ip22_eisa_intr, |
| 208 | .name = "EISA", |
| 209 | }; |
| 210 | |
| 211 | static struct irqaction cascade_action = { |
| 212 | .handler = no_action, |
| 213 | .name = "EISA cascade", |
| 214 | }; |
| 215 | |
| 216 | int __init ip22_eisa_init(void) |
| 217 | { |
| 218 | int i, c; |
| 219 | char *str; |
Ralf Baechle | 42a3b4f | 2005-09-03 15:56:17 -0700 | [diff] [blame] | 220 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | if (!(sgimc->systemid & SGIMC_SYSID_EPRESENT)) { |
| 222 | printk(KERN_INFO "EISA: bus not present.\n"); |
| 223 | return 1; |
| 224 | } |
| 225 | |
| 226 | printk(KERN_INFO "EISA: Probing bus...\n"); |
Thiemo Seufer | 37c8c64 | 2005-08-31 15:55:16 +0000 | [diff] [blame] | 227 | for (c = 0, i = 1; i <= IP22_EISA_MAX_SLOTS; i++) { |
| 228 | if ((str = decode_eisa_sig(0x1000 * i + EISA_VENDOR_ID_OFFSET))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 229 | printk(KERN_INFO "EISA: slot %d : %s detected.\n", |
| 230 | i, str); |
| 231 | c++; |
| 232 | } |
| 233 | } |
| 234 | printk(KERN_INFO "EISA: Detected %d card%s.\n", c, c < 2 ? "" : "s"); |
| 235 | #ifdef CONFIG_ISA |
| 236 | printk(KERN_INFO "ISA support compiled in.\n"); |
| 237 | #endif |
| 238 | |
| 239 | /* Warning : BlackMagicAhead(tm). |
| 240 | Please wave your favorite dead chicken over the busses */ |
| 241 | |
| 242 | /* First say hello to the EIU */ |
Thiemo Seufer | 37c8c64 | 2005-08-31 15:55:16 +0000 | [diff] [blame] | 243 | outl(0x0000FFFF, EIU_PREMPT_REG); |
| 244 | outl(1, EIU_QUIET_REG); |
| 245 | outl(0x40f3c07F, EIU_MODE_REG); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 246 | |
| 247 | /* Now be nice to the EISA chipset */ |
Thiemo Seufer | 37c8c64 | 2005-08-31 15:55:16 +0000 | [diff] [blame] | 248 | outb(1, EISA_EXT_NMI_RESET_CTRL); |
| 249 | udelay(50); /* Wait long enough for the dust to settle */ |
| 250 | outb(0, EISA_EXT_NMI_RESET_CTRL); |
| 251 | outb(0x11, EISA_INT1_CTRL); |
| 252 | outb(0x11, EISA_INT2_CTRL); |
| 253 | outb(0, EISA_INT1_MASK); |
| 254 | outb(8, EISA_INT2_MASK); |
| 255 | outb(4, EISA_INT1_MASK); |
| 256 | outb(2, EISA_INT2_MASK); |
| 257 | outb(1, EISA_INT1_MASK); |
| 258 | outb(1, EISA_INT2_MASK); |
| 259 | outb(0xfb, EISA_INT1_MASK); |
| 260 | outb(0xff, EISA_INT2_MASK); |
| 261 | outb(0, EISA_DMA2_WRITE_SINGLE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 262 | |
| 263 | for (i = SGINT_EISA; i < (SGINT_EISA + EISA_MAX_IRQ); i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 264 | if (i < (SGINT_EISA + 8)) |
Atsushi Nemoto | 1603b5a | 2006-11-02 02:08:36 +0900 | [diff] [blame] | 265 | set_irq_chip(i, &ip22_eisa1_irq_type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 266 | else |
Atsushi Nemoto | 1603b5a | 2006-11-02 02:08:36 +0900 | [diff] [blame] | 267 | set_irq_chip(i, &ip22_eisa2_irq_type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 268 | } |
| 269 | |
| 270 | /* Cannot use request_irq because of kmalloc not being ready at such |
| 271 | * an early stage. Yes, I've been bitten... */ |
| 272 | setup_irq(SGI_EISA_IRQ, &eisa_action); |
| 273 | setup_irq(SGINT_EISA + 2, &cascade_action); |
| 274 | |
| 275 | EISA_bus = 1; |
| 276 | return 0; |
| 277 | } |