Finn Thain | 6fe07aa | 2008-04-25 10:06:05 -0500 | [diff] [blame] | 1 | /* mac_esp.c: ESP front-end for Macintosh Quadra systems. |
| 2 | * |
| 3 | * Adapted from jazz_esp.c and the old mac_esp.c. |
| 4 | * |
| 5 | * The pseudo DMA algorithm is based on the one used in NetBSD. |
| 6 | * See sys/arch/mac68k/obio/esp.c for some background information. |
| 7 | * |
| 8 | * Copyright (C) 2007-2008 Finn Thain |
| 9 | */ |
| 10 | |
| 11 | #include <linux/kernel.h> |
| 12 | #include <linux/types.h> |
| 13 | #include <linux/module.h> |
| 14 | #include <linux/init.h> |
| 15 | #include <linux/interrupt.h> |
| 16 | #include <linux/platform_device.h> |
| 17 | #include <linux/dma-mapping.h> |
| 18 | #include <linux/scatterlist.h> |
| 19 | #include <linux/delay.h> |
| 20 | #include <linux/io.h> |
| 21 | #include <linux/nubus.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 22 | #include <linux/slab.h> |
Finn Thain | 6fe07aa | 2008-04-25 10:06:05 -0500 | [diff] [blame] | 23 | |
| 24 | #include <asm/irq.h> |
| 25 | #include <asm/dma.h> |
Finn Thain | 6fe07aa | 2008-04-25 10:06:05 -0500 | [diff] [blame] | 26 | #include <asm/macints.h> |
| 27 | #include <asm/macintosh.h> |
Finn Thain | 30c0527 | 2011-10-24 01:11:14 +1100 | [diff] [blame] | 28 | #include <asm/mac_via.h> |
Finn Thain | 6fe07aa | 2008-04-25 10:06:05 -0500 | [diff] [blame] | 29 | |
| 30 | #include <scsi/scsi_host.h> |
| 31 | |
| 32 | #include "esp_scsi.h" |
| 33 | |
| 34 | #define DRV_MODULE_NAME "mac_esp" |
| 35 | #define PFX DRV_MODULE_NAME ": " |
| 36 | #define DRV_VERSION "1.000" |
| 37 | #define DRV_MODULE_RELDATE "Sept 15, 2007" |
| 38 | |
| 39 | #define MAC_ESP_IO_BASE 0x50F00000 |
| 40 | #define MAC_ESP_REGS_QUADRA (MAC_ESP_IO_BASE + 0x10000) |
| 41 | #define MAC_ESP_REGS_QUADRA2 (MAC_ESP_IO_BASE + 0xF000) |
| 42 | #define MAC_ESP_REGS_QUADRA3 (MAC_ESP_IO_BASE + 0x18000) |
| 43 | #define MAC_ESP_REGS_SPACING 0x402 |
| 44 | #define MAC_ESP_PDMA_REG 0xF9800024 |
| 45 | #define MAC_ESP_PDMA_REG_SPACING 0x4 |
| 46 | #define MAC_ESP_PDMA_IO_OFFSET 0x100 |
| 47 | |
| 48 | #define esp_read8(REG) mac_esp_read8(esp, REG) |
| 49 | #define esp_write8(VAL, REG) mac_esp_write8(esp, VAL, REG) |
| 50 | |
| 51 | struct mac_esp_priv { |
| 52 | struct esp *esp; |
| 53 | void __iomem *pdma_regs; |
| 54 | void __iomem *pdma_io; |
| 55 | int error; |
| 56 | }; |
Finn Thain | da24465 | 2008-11-17 21:37:45 +0100 | [diff] [blame] | 57 | static struct esp *esp_chips[2]; |
Finn Thain | 6fe07aa | 2008-04-25 10:06:05 -0500 | [diff] [blame] | 58 | |
| 59 | #define MAC_ESP_GET_PRIV(esp) ((struct mac_esp_priv *) \ |
| 60 | platform_get_drvdata((struct platform_device *) \ |
| 61 | (esp->dev))) |
| 62 | |
| 63 | static inline void mac_esp_write8(struct esp *esp, u8 val, unsigned long reg) |
| 64 | { |
| 65 | nubus_writeb(val, esp->regs + reg * 16); |
| 66 | } |
| 67 | |
| 68 | static inline u8 mac_esp_read8(struct esp *esp, unsigned long reg) |
| 69 | { |
| 70 | return nubus_readb(esp->regs + reg * 16); |
| 71 | } |
| 72 | |
| 73 | /* For pseudo DMA and PIO we need the virtual address |
| 74 | * so this address mapping is the identity mapping. |
| 75 | */ |
| 76 | |
| 77 | static dma_addr_t mac_esp_map_single(struct esp *esp, void *buf, |
| 78 | size_t sz, int dir) |
| 79 | { |
| 80 | return (dma_addr_t)buf; |
| 81 | } |
| 82 | |
| 83 | static int mac_esp_map_sg(struct esp *esp, struct scatterlist *sg, |
| 84 | int num_sg, int dir) |
| 85 | { |
| 86 | int i; |
| 87 | |
| 88 | for (i = 0; i < num_sg; i++) |
| 89 | sg[i].dma_address = (u32)sg_virt(&sg[i]); |
| 90 | return num_sg; |
| 91 | } |
| 92 | |
| 93 | static void mac_esp_unmap_single(struct esp *esp, dma_addr_t addr, |
| 94 | size_t sz, int dir) |
| 95 | { |
| 96 | /* Nothing to do. */ |
| 97 | } |
| 98 | |
| 99 | static void mac_esp_unmap_sg(struct esp *esp, struct scatterlist *sg, |
| 100 | int num_sg, int dir) |
| 101 | { |
| 102 | /* Nothing to do. */ |
| 103 | } |
| 104 | |
| 105 | static void mac_esp_reset_dma(struct esp *esp) |
| 106 | { |
| 107 | /* Nothing to do. */ |
| 108 | } |
| 109 | |
| 110 | static void mac_esp_dma_drain(struct esp *esp) |
| 111 | { |
| 112 | /* Nothing to do. */ |
| 113 | } |
| 114 | |
| 115 | static void mac_esp_dma_invalidate(struct esp *esp) |
| 116 | { |
| 117 | /* Nothing to do. */ |
| 118 | } |
| 119 | |
| 120 | static int mac_esp_dma_error(struct esp *esp) |
| 121 | { |
| 122 | return MAC_ESP_GET_PRIV(esp)->error; |
| 123 | } |
| 124 | |
| 125 | static inline int mac_esp_wait_for_empty_fifo(struct esp *esp) |
| 126 | { |
| 127 | struct mac_esp_priv *mep = MAC_ESP_GET_PRIV(esp); |
| 128 | int i = 500000; |
| 129 | |
| 130 | do { |
| 131 | if (!(esp_read8(ESP_FFLAGS) & ESP_FF_FBYTES)) |
| 132 | return 0; |
| 133 | |
| 134 | if (esp_read8(ESP_STATUS) & ESP_STAT_INTR) |
| 135 | return 1; |
| 136 | |
| 137 | udelay(2); |
| 138 | } while (--i); |
| 139 | |
| 140 | printk(KERN_ERR PFX "FIFO is not empty (sreg %02x)\n", |
| 141 | esp_read8(ESP_STATUS)); |
| 142 | mep->error = 1; |
| 143 | return 1; |
| 144 | } |
| 145 | |
| 146 | static inline int mac_esp_wait_for_dreq(struct esp *esp) |
| 147 | { |
| 148 | struct mac_esp_priv *mep = MAC_ESP_GET_PRIV(esp); |
| 149 | int i = 500000; |
| 150 | |
| 151 | do { |
| 152 | if (mep->pdma_regs == NULL) { |
Finn Thain | 30c0527 | 2011-10-24 01:11:14 +1100 | [diff] [blame] | 153 | if (via2_scsi_drq_pending()) |
Finn Thain | 6fe07aa | 2008-04-25 10:06:05 -0500 | [diff] [blame] | 154 | return 0; |
| 155 | } else { |
| 156 | if (nubus_readl(mep->pdma_regs) & 0x200) |
| 157 | return 0; |
| 158 | } |
| 159 | |
| 160 | if (esp_read8(ESP_STATUS) & ESP_STAT_INTR) |
| 161 | return 1; |
| 162 | |
| 163 | udelay(2); |
| 164 | } while (--i); |
| 165 | |
| 166 | printk(KERN_ERR PFX "PDMA timeout (sreg %02x)\n", |
| 167 | esp_read8(ESP_STATUS)); |
| 168 | mep->error = 1; |
| 169 | return 1; |
| 170 | } |
| 171 | |
| 172 | #define MAC_ESP_PDMA_LOOP(operands) \ |
| 173 | asm volatile ( \ |
Finn Thain | 09e13e9 | 2008-11-17 21:37:07 +0100 | [diff] [blame] | 174 | " tstw %1 \n" \ |
Finn Thain | 6fe07aa | 2008-04-25 10:06:05 -0500 | [diff] [blame] | 175 | " jbeq 20f \n" \ |
| 176 | "1: movew " operands " \n" \ |
| 177 | "2: movew " operands " \n" \ |
| 178 | "3: movew " operands " \n" \ |
| 179 | "4: movew " operands " \n" \ |
| 180 | "5: movew " operands " \n" \ |
| 181 | "6: movew " operands " \n" \ |
| 182 | "7: movew " operands " \n" \ |
| 183 | "8: movew " operands " \n" \ |
| 184 | "9: movew " operands " \n" \ |
| 185 | "10: movew " operands " \n" \ |
| 186 | "11: movew " operands " \n" \ |
| 187 | "12: movew " operands " \n" \ |
| 188 | "13: movew " operands " \n" \ |
| 189 | "14: movew " operands " \n" \ |
| 190 | "15: movew " operands " \n" \ |
| 191 | "16: movew " operands " \n" \ |
Finn Thain | 09e13e9 | 2008-11-17 21:37:07 +0100 | [diff] [blame] | 192 | " subqw #1,%1 \n" \ |
Finn Thain | 6fe07aa | 2008-04-25 10:06:05 -0500 | [diff] [blame] | 193 | " jbne 1b \n" \ |
Finn Thain | 09e13e9 | 2008-11-17 21:37:07 +0100 | [diff] [blame] | 194 | "20: tstw %2 \n" \ |
Finn Thain | 6fe07aa | 2008-04-25 10:06:05 -0500 | [diff] [blame] | 195 | " jbeq 30f \n" \ |
| 196 | "21: movew " operands " \n" \ |
Finn Thain | 09e13e9 | 2008-11-17 21:37:07 +0100 | [diff] [blame] | 197 | " subqw #1,%2 \n" \ |
Finn Thain | 6fe07aa | 2008-04-25 10:06:05 -0500 | [diff] [blame] | 198 | " jbne 21b \n" \ |
Finn Thain | 09e13e9 | 2008-11-17 21:37:07 +0100 | [diff] [blame] | 199 | "30: tstw %3 \n" \ |
Finn Thain | 6fe07aa | 2008-04-25 10:06:05 -0500 | [diff] [blame] | 200 | " jbeq 40f \n" \ |
| 201 | "31: moveb " operands " \n" \ |
| 202 | "32: nop \n" \ |
| 203 | "40: \n" \ |
| 204 | " \n" \ |
| 205 | " .section __ex_table,\"a\" \n" \ |
| 206 | " .align 4 \n" \ |
| 207 | " .long 1b,40b \n" \ |
| 208 | " .long 2b,40b \n" \ |
| 209 | " .long 3b,40b \n" \ |
| 210 | " .long 4b,40b \n" \ |
| 211 | " .long 5b,40b \n" \ |
| 212 | " .long 6b,40b \n" \ |
| 213 | " .long 7b,40b \n" \ |
| 214 | " .long 8b,40b \n" \ |
| 215 | " .long 9b,40b \n" \ |
| 216 | " .long 10b,40b \n" \ |
| 217 | " .long 11b,40b \n" \ |
| 218 | " .long 12b,40b \n" \ |
| 219 | " .long 13b,40b \n" \ |
| 220 | " .long 14b,40b \n" \ |
| 221 | " .long 15b,40b \n" \ |
| 222 | " .long 16b,40b \n" \ |
| 223 | " .long 21b,40b \n" \ |
| 224 | " .long 31b,40b \n" \ |
| 225 | " .long 32b,40b \n" \ |
| 226 | " .previous \n" \ |
Finn Thain | 09e13e9 | 2008-11-17 21:37:07 +0100 | [diff] [blame] | 227 | : "+a" (addr), "+r" (count32), "+r" (count2) \ |
| 228 | : "g" (count1), "a" (mep->pdma_io)) |
Finn Thain | 6fe07aa | 2008-04-25 10:06:05 -0500 | [diff] [blame] | 229 | |
| 230 | static void mac_esp_send_pdma_cmd(struct esp *esp, u32 addr, u32 esp_count, |
| 231 | u32 dma_count, int write, u8 cmd) |
| 232 | { |
| 233 | struct mac_esp_priv *mep = MAC_ESP_GET_PRIV(esp); |
Finn Thain | 6fe07aa | 2008-04-25 10:06:05 -0500 | [diff] [blame] | 234 | |
| 235 | mep->error = 0; |
| 236 | |
| 237 | if (!write) |
| 238 | scsi_esp_cmd(esp, ESP_CMD_FLUSH); |
| 239 | |
| 240 | esp_write8((esp_count >> 0) & 0xFF, ESP_TCLOW); |
| 241 | esp_write8((esp_count >> 8) & 0xFF, ESP_TCMED); |
| 242 | |
| 243 | scsi_esp_cmd(esp, cmd); |
| 244 | |
| 245 | do { |
| 246 | unsigned int count32 = esp_count >> 5; |
| 247 | unsigned int count2 = (esp_count & 0x1F) >> 1; |
Finn Thain | 09e13e9 | 2008-11-17 21:37:07 +0100 | [diff] [blame] | 248 | unsigned int count1 = esp_count & 1; |
Finn Thain | 6fe07aa | 2008-04-25 10:06:05 -0500 | [diff] [blame] | 249 | unsigned int start_addr = addr; |
| 250 | |
| 251 | if (mac_esp_wait_for_dreq(esp)) |
| 252 | break; |
| 253 | |
| 254 | if (write) { |
Finn Thain | 09e13e9 | 2008-11-17 21:37:07 +0100 | [diff] [blame] | 255 | MAC_ESP_PDMA_LOOP("%4@,%0@+"); |
Finn Thain | 6fe07aa | 2008-04-25 10:06:05 -0500 | [diff] [blame] | 256 | |
| 257 | esp_count -= addr - start_addr; |
| 258 | } else { |
| 259 | unsigned int n; |
| 260 | |
Finn Thain | 09e13e9 | 2008-11-17 21:37:07 +0100 | [diff] [blame] | 261 | MAC_ESP_PDMA_LOOP("%0@+,%4@"); |
Finn Thain | 6fe07aa | 2008-04-25 10:06:05 -0500 | [diff] [blame] | 262 | |
| 263 | if (mac_esp_wait_for_empty_fifo(esp)) |
| 264 | break; |
| 265 | |
| 266 | n = (esp_read8(ESP_TCMED) << 8) + esp_read8(ESP_TCLOW); |
| 267 | addr = start_addr + esp_count - n; |
| 268 | esp_count = n; |
| 269 | } |
| 270 | } while (esp_count); |
Finn Thain | 6fe07aa | 2008-04-25 10:06:05 -0500 | [diff] [blame] | 271 | } |
| 272 | |
| 273 | /* |
| 274 | * Programmed IO routines follow. |
| 275 | */ |
| 276 | |
Finn Thain | 02507a8 | 2009-12-05 12:30:42 +1100 | [diff] [blame] | 277 | static inline unsigned int mac_esp_wait_for_fifo(struct esp *esp) |
Finn Thain | 6fe07aa | 2008-04-25 10:06:05 -0500 | [diff] [blame] | 278 | { |
| 279 | int i = 500000; |
| 280 | |
| 281 | do { |
Finn Thain | 02507a8 | 2009-12-05 12:30:42 +1100 | [diff] [blame] | 282 | unsigned int fbytes = esp_read8(ESP_FFLAGS) & ESP_FF_FBYTES; |
| 283 | |
| 284 | if (fbytes) |
| 285 | return fbytes; |
Finn Thain | 6fe07aa | 2008-04-25 10:06:05 -0500 | [diff] [blame] | 286 | |
| 287 | udelay(2); |
| 288 | } while (--i); |
| 289 | |
| 290 | printk(KERN_ERR PFX "FIFO is empty (sreg %02x)\n", |
| 291 | esp_read8(ESP_STATUS)); |
Finn Thain | 02507a8 | 2009-12-05 12:30:42 +1100 | [diff] [blame] | 292 | return 0; |
Finn Thain | 6fe07aa | 2008-04-25 10:06:05 -0500 | [diff] [blame] | 293 | } |
| 294 | |
| 295 | static inline int mac_esp_wait_for_intr(struct esp *esp) |
| 296 | { |
Finn Thain | 02507a8 | 2009-12-05 12:30:42 +1100 | [diff] [blame] | 297 | struct mac_esp_priv *mep = MAC_ESP_GET_PRIV(esp); |
Finn Thain | 6fe07aa | 2008-04-25 10:06:05 -0500 | [diff] [blame] | 298 | int i = 500000; |
| 299 | |
| 300 | do { |
| 301 | esp->sreg = esp_read8(ESP_STATUS); |
| 302 | if (esp->sreg & ESP_STAT_INTR) |
| 303 | return 0; |
| 304 | |
| 305 | udelay(2); |
| 306 | } while (--i); |
| 307 | |
| 308 | printk(KERN_ERR PFX "IRQ timeout (sreg %02x)\n", esp->sreg); |
Finn Thain | 02507a8 | 2009-12-05 12:30:42 +1100 | [diff] [blame] | 309 | mep->error = 1; |
Finn Thain | 6fe07aa | 2008-04-25 10:06:05 -0500 | [diff] [blame] | 310 | return 1; |
| 311 | } |
| 312 | |
| 313 | #define MAC_ESP_PIO_LOOP(operands, reg1) \ |
| 314 | asm volatile ( \ |
| 315 | "1: moveb " operands " \n" \ |
| 316 | " subqw #1,%1 \n" \ |
| 317 | " jbne 1b \n" \ |
| 318 | : "+a" (addr), "+r" (reg1) \ |
| 319 | : "a" (fifo)) |
| 320 | |
| 321 | #define MAC_ESP_PIO_FILL(operands, reg1) \ |
| 322 | asm volatile ( \ |
| 323 | " moveb " operands " \n" \ |
| 324 | " moveb " operands " \n" \ |
| 325 | " moveb " operands " \n" \ |
| 326 | " moveb " operands " \n" \ |
| 327 | " moveb " operands " \n" \ |
| 328 | " moveb " operands " \n" \ |
| 329 | " moveb " operands " \n" \ |
| 330 | " moveb " operands " \n" \ |
| 331 | " moveb " operands " \n" \ |
| 332 | " moveb " operands " \n" \ |
| 333 | " moveb " operands " \n" \ |
| 334 | " moveb " operands " \n" \ |
| 335 | " moveb " operands " \n" \ |
| 336 | " moveb " operands " \n" \ |
| 337 | " moveb " operands " \n" \ |
| 338 | " moveb " operands " \n" \ |
| 339 | " subqw #8,%1 \n" \ |
| 340 | " subqw #8,%1 \n" \ |
| 341 | : "+a" (addr), "+r" (reg1) \ |
| 342 | : "a" (fifo)) |
| 343 | |
| 344 | #define MAC_ESP_FIFO_SIZE 16 |
| 345 | |
| 346 | static void mac_esp_send_pio_cmd(struct esp *esp, u32 addr, u32 esp_count, |
| 347 | u32 dma_count, int write, u8 cmd) |
| 348 | { |
Finn Thain | 6fe07aa | 2008-04-25 10:06:05 -0500 | [diff] [blame] | 349 | struct mac_esp_priv *mep = MAC_ESP_GET_PRIV(esp); |
| 350 | u8 *fifo = esp->regs + ESP_FDATA * 16; |
| 351 | |
Finn Thain | 6fe07aa | 2008-04-25 10:06:05 -0500 | [diff] [blame] | 352 | cmd &= ~ESP_CMD_DMA; |
| 353 | mep->error = 0; |
| 354 | |
| 355 | if (write) { |
| 356 | scsi_esp_cmd(esp, cmd); |
| 357 | |
Finn Thain | 02507a8 | 2009-12-05 12:30:42 +1100 | [diff] [blame] | 358 | while (1) { |
| 359 | unsigned int n; |
| 360 | |
| 361 | n = mac_esp_wait_for_fifo(esp); |
| 362 | if (!n) |
| 363 | break; |
| 364 | |
| 365 | if (n > esp_count) |
| 366 | n = esp_count; |
| 367 | esp_count -= n; |
| 368 | |
| 369 | MAC_ESP_PIO_LOOP("%2@,%0@+", n); |
| 370 | |
| 371 | if (!esp_count) |
| 372 | break; |
| 373 | |
| 374 | if (mac_esp_wait_for_intr(esp)) |
| 375 | break; |
| 376 | |
| 377 | if (((esp->sreg & ESP_STAT_PMASK) != ESP_DIP) && |
| 378 | ((esp->sreg & ESP_STAT_PMASK) != ESP_MIP)) |
| 379 | break; |
| 380 | |
| 381 | esp->ireg = esp_read8(ESP_INTRPT); |
| 382 | if ((esp->ireg & (ESP_INTR_DC | ESP_INTR_BSERV)) != |
| 383 | ESP_INTR_BSERV) |
| 384 | break; |
| 385 | |
| 386 | scsi_esp_cmd(esp, ESP_CMD_TI); |
Finn Thain | 6fe07aa | 2008-04-25 10:06:05 -0500 | [diff] [blame] | 387 | } |
| 388 | } else { |
| 389 | scsi_esp_cmd(esp, ESP_CMD_FLUSH); |
| 390 | |
| 391 | if (esp_count >= MAC_ESP_FIFO_SIZE) |
| 392 | MAC_ESP_PIO_FILL("%0@+,%2@", esp_count); |
| 393 | else |
| 394 | MAC_ESP_PIO_LOOP("%0@+,%2@", esp_count); |
| 395 | |
| 396 | scsi_esp_cmd(esp, cmd); |
Finn Thain | 6fe07aa | 2008-04-25 10:06:05 -0500 | [diff] [blame] | 397 | |
Finn Thain | 02507a8 | 2009-12-05 12:30:42 +1100 | [diff] [blame] | 398 | while (esp_count) { |
| 399 | unsigned int n; |
Finn Thain | 6fe07aa | 2008-04-25 10:06:05 -0500 | [diff] [blame] | 400 | |
Finn Thain | 02507a8 | 2009-12-05 12:30:42 +1100 | [diff] [blame] | 401 | if (mac_esp_wait_for_intr(esp)) |
Finn Thain | 6fe07aa | 2008-04-25 10:06:05 -0500 | [diff] [blame] | 402 | break; |
| 403 | |
Finn Thain | 02507a8 | 2009-12-05 12:30:42 +1100 | [diff] [blame] | 404 | if (((esp->sreg & ESP_STAT_PMASK) != ESP_DOP) && |
| 405 | ((esp->sreg & ESP_STAT_PMASK) != ESP_MOP)) |
| 406 | break; |
Finn Thain | 6fe07aa | 2008-04-25 10:06:05 -0500 | [diff] [blame] | 407 | |
Finn Thain | 6fe07aa | 2008-04-25 10:06:05 -0500 | [diff] [blame] | 408 | esp->ireg = esp_read8(ESP_INTRPT); |
Finn Thain | 02507a8 | 2009-12-05 12:30:42 +1100 | [diff] [blame] | 409 | if ((esp->ireg & (ESP_INTR_DC | ESP_INTR_BSERV)) != |
| 410 | ESP_INTR_BSERV) |
Finn Thain | 6fe07aa | 2008-04-25 10:06:05 -0500 | [diff] [blame] | 411 | break; |
| 412 | |
Finn Thain | 02507a8 | 2009-12-05 12:30:42 +1100 | [diff] [blame] | 413 | n = MAC_ESP_FIFO_SIZE - |
| 414 | (esp_read8(ESP_FFLAGS) & ESP_FF_FBYTES); |
Finn Thain | 6fe07aa | 2008-04-25 10:06:05 -0500 | [diff] [blame] | 415 | if (n > esp_count) |
| 416 | n = esp_count; |
| 417 | |
| 418 | if (n == MAC_ESP_FIFO_SIZE) { |
| 419 | MAC_ESP_PIO_FILL("%0@+,%2@", esp_count); |
| 420 | } else { |
| 421 | esp_count -= n; |
| 422 | MAC_ESP_PIO_LOOP("%0@+,%2@", n); |
| 423 | } |
| 424 | |
| 425 | scsi_esp_cmd(esp, ESP_CMD_TI); |
| 426 | } |
| 427 | } |
Finn Thain | 6fe07aa | 2008-04-25 10:06:05 -0500 | [diff] [blame] | 428 | } |
| 429 | |
| 430 | static int mac_esp_irq_pending(struct esp *esp) |
| 431 | { |
| 432 | if (esp_read8(ESP_STATUS) & ESP_STAT_INTR) |
| 433 | return 1; |
| 434 | return 0; |
| 435 | } |
| 436 | |
| 437 | static u32 mac_esp_dma_length_limit(struct esp *esp, u32 dma_addr, u32 dma_len) |
| 438 | { |
| 439 | return dma_len > 0xFFFF ? 0xFFFF : dma_len; |
| 440 | } |
| 441 | |
Finn Thain | da24465 | 2008-11-17 21:37:45 +0100 | [diff] [blame] | 442 | static irqreturn_t mac_scsi_esp_intr(int irq, void *dev_id) |
| 443 | { |
| 444 | int got_intr; |
| 445 | |
| 446 | /* |
| 447 | * This is an edge triggered IRQ, so we have to be careful to |
| 448 | * avoid missing a transition when it is shared by two ESP devices. |
| 449 | */ |
| 450 | |
| 451 | do { |
| 452 | got_intr = 0; |
| 453 | if (esp_chips[0] && |
| 454 | (mac_esp_read8(esp_chips[0], ESP_STATUS) & ESP_STAT_INTR)) { |
| 455 | (void)scsi_esp_intr(irq, esp_chips[0]); |
| 456 | got_intr = 1; |
| 457 | } |
| 458 | if (esp_chips[1] && |
| 459 | (mac_esp_read8(esp_chips[1], ESP_STATUS) & ESP_STAT_INTR)) { |
| 460 | (void)scsi_esp_intr(irq, esp_chips[1]); |
| 461 | got_intr = 1; |
| 462 | } |
| 463 | } while (got_intr); |
| 464 | |
| 465 | return IRQ_HANDLED; |
| 466 | } |
| 467 | |
Finn Thain | 6fe07aa | 2008-04-25 10:06:05 -0500 | [diff] [blame] | 468 | static struct esp_driver_ops mac_esp_ops = { |
| 469 | .esp_write8 = mac_esp_write8, |
| 470 | .esp_read8 = mac_esp_read8, |
| 471 | .map_single = mac_esp_map_single, |
| 472 | .map_sg = mac_esp_map_sg, |
| 473 | .unmap_single = mac_esp_unmap_single, |
| 474 | .unmap_sg = mac_esp_unmap_sg, |
| 475 | .irq_pending = mac_esp_irq_pending, |
| 476 | .dma_length_limit = mac_esp_dma_length_limit, |
| 477 | .reset_dma = mac_esp_reset_dma, |
| 478 | .dma_drain = mac_esp_dma_drain, |
| 479 | .dma_invalidate = mac_esp_dma_invalidate, |
| 480 | .send_dma_cmd = mac_esp_send_pdma_cmd, |
| 481 | .dma_error = mac_esp_dma_error, |
| 482 | }; |
| 483 | |
| 484 | static int __devinit esp_mac_probe(struct platform_device *dev) |
| 485 | { |
| 486 | struct scsi_host_template *tpnt = &scsi_esp_template; |
| 487 | struct Scsi_Host *host; |
| 488 | struct esp *esp; |
| 489 | int err; |
Finn Thain | 6fe07aa | 2008-04-25 10:06:05 -0500 | [diff] [blame] | 490 | struct mac_esp_priv *mep; |
| 491 | |
| 492 | if (!MACH_IS_MAC) |
| 493 | return -ENODEV; |
| 494 | |
Finn Thain | cff75f1 | 2009-11-04 00:41:35 +1100 | [diff] [blame] | 495 | if (dev->id > 1) |
Finn Thain | 6fe07aa | 2008-04-25 10:06:05 -0500 | [diff] [blame] | 496 | return -ENODEV; |
| 497 | |
| 498 | host = scsi_host_alloc(tpnt, sizeof(struct esp)); |
| 499 | |
| 500 | err = -ENOMEM; |
| 501 | if (!host) |
| 502 | goto fail; |
| 503 | |
| 504 | host->max_id = 8; |
| 505 | host->use_clustering = DISABLE_CLUSTERING; |
| 506 | esp = shost_priv(host); |
| 507 | |
| 508 | esp->host = host; |
| 509 | esp->dev = dev; |
| 510 | |
| 511 | esp->command_block = kzalloc(16, GFP_KERNEL); |
| 512 | if (!esp->command_block) |
| 513 | goto fail_unlink; |
| 514 | esp->command_block_dma = (dma_addr_t)esp->command_block; |
| 515 | |
| 516 | esp->scsi_id = 7; |
| 517 | host->this_id = esp->scsi_id; |
| 518 | esp->scsi_id_mask = 1 << esp->scsi_id; |
| 519 | |
| 520 | mep = kzalloc(sizeof(struct mac_esp_priv), GFP_KERNEL); |
| 521 | if (!mep) |
| 522 | goto fail_free_command_block; |
| 523 | mep->esp = esp; |
| 524 | platform_set_drvdata(dev, mep); |
| 525 | |
| 526 | switch (macintosh_config->scsi_type) { |
| 527 | case MAC_SCSI_QUADRA: |
| 528 | esp->cfreq = 16500000; |
| 529 | esp->regs = (void __iomem *)MAC_ESP_REGS_QUADRA; |
| 530 | mep->pdma_io = esp->regs + MAC_ESP_PDMA_IO_OFFSET; |
| 531 | mep->pdma_regs = NULL; |
| 532 | break; |
| 533 | case MAC_SCSI_QUADRA2: |
| 534 | esp->cfreq = 25000000; |
| 535 | esp->regs = (void __iomem *)(MAC_ESP_REGS_QUADRA2 + |
| 536 | dev->id * MAC_ESP_REGS_SPACING); |
| 537 | mep->pdma_io = esp->regs + MAC_ESP_PDMA_IO_OFFSET; |
| 538 | mep->pdma_regs = (void __iomem *)(MAC_ESP_PDMA_REG + |
| 539 | dev->id * MAC_ESP_PDMA_REG_SPACING); |
| 540 | nubus_writel(0x1d1, mep->pdma_regs); |
| 541 | break; |
| 542 | case MAC_SCSI_QUADRA3: |
| 543 | /* These quadras have a real DMA controller (the PSC) but we |
| 544 | * don't know how to drive it so we must use PIO instead. |
| 545 | */ |
| 546 | esp->cfreq = 25000000; |
| 547 | esp->regs = (void __iomem *)MAC_ESP_REGS_QUADRA3; |
| 548 | mep->pdma_io = NULL; |
| 549 | mep->pdma_regs = NULL; |
| 550 | break; |
| 551 | } |
| 552 | |
| 553 | esp->ops = &mac_esp_ops; |
| 554 | if (mep->pdma_io == NULL) { |
| 555 | printk(KERN_INFO PFX "using PIO for controller %d\n", dev->id); |
| 556 | esp_write8(0, ESP_TCLOW); |
| 557 | esp_write8(0, ESP_TCMED); |
| 558 | esp->flags = ESP_FLAG_DISABLE_SYNC; |
| 559 | mac_esp_ops.send_dma_cmd = mac_esp_send_pio_cmd; |
| 560 | } else { |
| 561 | printk(KERN_INFO PFX "using PDMA for controller %d\n", dev->id); |
| 562 | } |
| 563 | |
| 564 | host->irq = IRQ_MAC_SCSI; |
Finn Thain | da24465 | 2008-11-17 21:37:45 +0100 | [diff] [blame] | 565 | esp_chips[dev->id] = esp; |
| 566 | mb(); |
| 567 | if (esp_chips[!dev->id] == NULL) { |
| 568 | err = request_irq(host->irq, mac_scsi_esp_intr, 0, |
| 569 | "Mac ESP", NULL); |
| 570 | if (err < 0) { |
| 571 | esp_chips[dev->id] = NULL; |
| 572 | goto fail_free_priv; |
| 573 | } |
| 574 | } |
Finn Thain | 6fe07aa | 2008-04-25 10:06:05 -0500 | [diff] [blame] | 575 | |
| 576 | err = scsi_esp_register(esp, &dev->dev); |
| 577 | if (err) |
| 578 | goto fail_free_irq; |
| 579 | |
| 580 | return 0; |
| 581 | |
| 582 | fail_free_irq: |
Finn Thain | da24465 | 2008-11-17 21:37:45 +0100 | [diff] [blame] | 583 | if (esp_chips[!dev->id] == NULL) |
| 584 | free_irq(host->irq, esp); |
Finn Thain | 6fe07aa | 2008-04-25 10:06:05 -0500 | [diff] [blame] | 585 | fail_free_priv: |
| 586 | kfree(mep); |
| 587 | fail_free_command_block: |
| 588 | kfree(esp->command_block); |
| 589 | fail_unlink: |
| 590 | scsi_host_put(host); |
| 591 | fail: |
| 592 | return err; |
| 593 | } |
| 594 | |
| 595 | static int __devexit esp_mac_remove(struct platform_device *dev) |
| 596 | { |
| 597 | struct mac_esp_priv *mep = platform_get_drvdata(dev); |
| 598 | struct esp *esp = mep->esp; |
| 599 | unsigned int irq = esp->host->irq; |
| 600 | |
| 601 | scsi_esp_unregister(esp); |
| 602 | |
Finn Thain | da24465 | 2008-11-17 21:37:45 +0100 | [diff] [blame] | 603 | esp_chips[dev->id] = NULL; |
| 604 | if (!(esp_chips[0] || esp_chips[1])) |
| 605 | free_irq(irq, NULL); |
Finn Thain | 6fe07aa | 2008-04-25 10:06:05 -0500 | [diff] [blame] | 606 | |
| 607 | kfree(mep); |
| 608 | |
| 609 | kfree(esp->command_block); |
| 610 | |
| 611 | scsi_host_put(esp->host); |
| 612 | |
| 613 | return 0; |
| 614 | } |
| 615 | |
| 616 | static struct platform_driver esp_mac_driver = { |
| 617 | .probe = esp_mac_probe, |
| 618 | .remove = __devexit_p(esp_mac_remove), |
| 619 | .driver = { |
Finn Thain | cff75f1 | 2009-11-04 00:41:35 +1100 | [diff] [blame] | 620 | .name = DRV_MODULE_NAME, |
| 621 | .owner = THIS_MODULE, |
Finn Thain | 6fe07aa | 2008-04-25 10:06:05 -0500 | [diff] [blame] | 622 | }, |
| 623 | }; |
| 624 | |
| 625 | static int __init mac_esp_init(void) |
| 626 | { |
Finn Thain | cff75f1 | 2009-11-04 00:41:35 +1100 | [diff] [blame] | 627 | return platform_driver_register(&esp_mac_driver); |
Finn Thain | 6fe07aa | 2008-04-25 10:06:05 -0500 | [diff] [blame] | 628 | } |
| 629 | |
| 630 | static void __exit mac_esp_exit(void) |
| 631 | { |
| 632 | platform_driver_unregister(&esp_mac_driver); |
Finn Thain | 6fe07aa | 2008-04-25 10:06:05 -0500 | [diff] [blame] | 633 | } |
| 634 | |
| 635 | MODULE_DESCRIPTION("Mac ESP SCSI driver"); |
| 636 | MODULE_AUTHOR("Finn Thain <fthain@telegraphics.com.au>"); |
Al Viro | 839cd31 | 2008-05-21 06:32:11 +0100 | [diff] [blame] | 637 | MODULE_LICENSE("GPL v2"); |
Finn Thain | 6fe07aa | 2008-04-25 10:06:05 -0500 | [diff] [blame] | 638 | MODULE_VERSION(DRV_VERSION); |
Finn Thain | cff75f1 | 2009-11-04 00:41:35 +1100 | [diff] [blame] | 639 | MODULE_ALIAS("platform:" DRV_MODULE_NAME); |
Finn Thain | 6fe07aa | 2008-04-25 10:06:05 -0500 | [diff] [blame] | 640 | |
| 641 | module_init(mac_esp_init); |
| 642 | module_exit(mac_esp_exit); |