Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * NCR 5380 defines |
| 3 | * |
| 4 | * Copyright 1993, Drew Eckhardt |
| 5 | * Visionary Computing |
| 6 | * (Unix consulting and custom programming) |
| 7 | * drew@colorado.edu |
| 8 | * +1 (303) 666-5836 |
| 9 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 10 | * For more information, please consult |
| 11 | * |
| 12 | * NCR 5380 Family |
| 13 | * SCSI Protocol Controller |
| 14 | * Databook |
| 15 | * NCR Microelectronics |
| 16 | * 1635 Aeroplaza Drive |
| 17 | * Colorado Springs, CO 80916 |
| 18 | * 1+ (719) 578-3400 |
| 19 | * 1+ (800) 334-5454 |
| 20 | */ |
| 21 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | #ifndef NCR5380_H |
| 23 | #define NCR5380_H |
| 24 | |
| 25 | #include <linux/interrupt.h> |
Boaz Harrosh | 28424d3 | 2007-09-10 22:37:45 +0300 | [diff] [blame] | 26 | #include <scsi/scsi_eh.h> |
Boaz Harrosh | 28424d3 | 2007-09-10 22:37:45 +0300 | [diff] [blame] | 27 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | #define NDEBUG_ARBITRATION 0x1 |
| 29 | #define NDEBUG_AUTOSENSE 0x2 |
| 30 | #define NDEBUG_DMA 0x4 |
| 31 | #define NDEBUG_HANDSHAKE 0x8 |
| 32 | #define NDEBUG_INFORMATION 0x10 |
| 33 | #define NDEBUG_INIT 0x20 |
| 34 | #define NDEBUG_INTR 0x40 |
| 35 | #define NDEBUG_LINKED 0x80 |
| 36 | #define NDEBUG_MAIN 0x100 |
| 37 | #define NDEBUG_NO_DATAOUT 0x200 |
| 38 | #define NDEBUG_NO_WRITE 0x400 |
| 39 | #define NDEBUG_PIO 0x800 |
| 40 | #define NDEBUG_PSEUDO_DMA 0x1000 |
| 41 | #define NDEBUG_QUEUES 0x2000 |
| 42 | #define NDEBUG_RESELECTION 0x4000 |
| 43 | #define NDEBUG_SELECTION 0x8000 |
| 44 | #define NDEBUG_USLEEP 0x10000 |
| 45 | #define NDEBUG_LAST_BYTE_SENT 0x20000 |
| 46 | #define NDEBUG_RESTART_SELECT 0x40000 |
| 47 | #define NDEBUG_EXTENDED 0x80000 |
| 48 | #define NDEBUG_C400_PREAD 0x100000 |
| 49 | #define NDEBUG_C400_PWRITE 0x200000 |
| 50 | #define NDEBUG_LISTS 0x400000 |
Finn Thain | 9829e52 | 2014-03-18 11:42:21 +1100 | [diff] [blame] | 51 | #define NDEBUG_ABORT 0x800000 |
| 52 | #define NDEBUG_TAGS 0x1000000 |
| 53 | #define NDEBUG_MERGING 0x2000000 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | |
| 55 | #define NDEBUG_ANY 0xFFFFFFFFUL |
| 56 | |
| 57 | /* |
| 58 | * The contents of the OUTPUT DATA register are asserted on the bus when |
| 59 | * either arbitration is occurring or the phase-indicating signals ( |
| 60 | * IO, CD, MSG) in the TARGET COMMAND register and the ASSERT DATA |
| 61 | * bit in the INITIATOR COMMAND register is set. |
| 62 | */ |
| 63 | |
| 64 | #define OUTPUT_DATA_REG 0 /* wo DATA lines on SCSI bus */ |
| 65 | #define CURRENT_SCSI_DATA_REG 0 /* ro same */ |
| 66 | |
| 67 | #define INITIATOR_COMMAND_REG 1 /* rw */ |
| 68 | #define ICR_ASSERT_RST 0x80 /* rw Set to assert RST */ |
| 69 | #define ICR_ARBITRATION_PROGRESS 0x40 /* ro Indicates arbitration complete */ |
| 70 | #define ICR_TRI_STATE 0x40 /* wo Set to tri-state drivers */ |
| 71 | #define ICR_ARBITRATION_LOST 0x20 /* ro Indicates arbitration lost */ |
| 72 | #define ICR_DIFF_ENABLE 0x20 /* wo Set to enable diff. drivers */ |
| 73 | #define ICR_ASSERT_ACK 0x10 /* rw ini Set to assert ACK */ |
| 74 | #define ICR_ASSERT_BSY 0x08 /* rw Set to assert BSY */ |
| 75 | #define ICR_ASSERT_SEL 0x04 /* rw Set to assert SEL */ |
| 76 | #define ICR_ASSERT_ATN 0x02 /* rw Set to assert ATN */ |
| 77 | #define ICR_ASSERT_DATA 0x01 /* rw SCSI_DATA_REG is asserted */ |
| 78 | |
| 79 | #ifdef DIFFERENTIAL |
| 80 | #define ICR_BASE ICR_DIFF_ENABLE |
| 81 | #else |
| 82 | #define ICR_BASE 0 |
| 83 | #endif |
| 84 | |
| 85 | #define MODE_REG 2 |
| 86 | /* |
| 87 | * Note : BLOCK_DMA code will keep DRQ asserted for the duration of the |
| 88 | * transfer, causing the chip to hog the bus. You probably don't want |
| 89 | * this. |
| 90 | */ |
| 91 | #define MR_BLOCK_DMA_MODE 0x80 /* rw block mode DMA */ |
| 92 | #define MR_TARGET 0x40 /* rw target mode */ |
| 93 | #define MR_ENABLE_PAR_CHECK 0x20 /* rw enable parity checking */ |
| 94 | #define MR_ENABLE_PAR_INTR 0x10 /* rw enable bad parity interrupt */ |
| 95 | #define MR_ENABLE_EOP_INTR 0x08 /* rw enable eop interrupt */ |
| 96 | #define MR_MONITOR_BSY 0x04 /* rw enable int on unexpected bsy fail */ |
| 97 | #define MR_DMA_MODE 0x02 /* rw DMA / pseudo DMA mode */ |
| 98 | #define MR_ARBITRATE 0x01 /* rw start arbitration */ |
| 99 | |
| 100 | #ifdef PARITY |
| 101 | #define MR_BASE MR_ENABLE_PAR_CHECK |
| 102 | #else |
| 103 | #define MR_BASE 0 |
| 104 | #endif |
| 105 | |
| 106 | #define TARGET_COMMAND_REG 3 |
| 107 | #define TCR_LAST_BYTE_SENT 0x80 /* ro DMA done */ |
| 108 | #define TCR_ASSERT_REQ 0x08 /* tgt rw assert REQ */ |
| 109 | #define TCR_ASSERT_MSG 0x04 /* tgt rw assert MSG */ |
| 110 | #define TCR_ASSERT_CD 0x02 /* tgt rw assert CD */ |
| 111 | #define TCR_ASSERT_IO 0x01 /* tgt rw assert IO */ |
| 112 | |
| 113 | #define STATUS_REG 4 /* ro */ |
| 114 | /* |
| 115 | * Note : a set bit indicates an active signal, driven by us or another |
| 116 | * device. |
| 117 | */ |
| 118 | #define SR_RST 0x80 |
| 119 | #define SR_BSY 0x40 |
| 120 | #define SR_REQ 0x20 |
| 121 | #define SR_MSG 0x10 |
| 122 | #define SR_CD 0x08 |
| 123 | #define SR_IO 0x04 |
| 124 | #define SR_SEL 0x02 |
| 125 | #define SR_DBP 0x01 |
| 126 | |
| 127 | /* |
| 128 | * Setting a bit in this register will cause an interrupt to be generated when |
| 129 | * BSY is false and SEL true and this bit is asserted on the bus. |
| 130 | */ |
| 131 | #define SELECT_ENABLE_REG 4 /* wo */ |
| 132 | |
| 133 | #define BUS_AND_STATUS_REG 5 /* ro */ |
| 134 | #define BASR_END_DMA_TRANSFER 0x80 /* ro set on end of transfer */ |
| 135 | #define BASR_DRQ 0x40 /* ro mirror of DRQ pin */ |
| 136 | #define BASR_PARITY_ERROR 0x20 /* ro parity error detected */ |
| 137 | #define BASR_IRQ 0x10 /* ro mirror of IRQ pin */ |
| 138 | #define BASR_PHASE_MATCH 0x08 /* ro Set when MSG CD IO match TCR */ |
| 139 | #define BASR_BUSY_ERROR 0x04 /* ro Unexpected change to inactive state */ |
| 140 | #define BASR_ATN 0x02 /* ro BUS status */ |
| 141 | #define BASR_ACK 0x01 /* ro BUS status */ |
| 142 | |
| 143 | /* Write any value to this register to start a DMA send */ |
| 144 | #define START_DMA_SEND_REG 5 /* wo */ |
| 145 | |
| 146 | /* |
| 147 | * Used in DMA transfer mode, data is latched from the SCSI bus on |
| 148 | * the falling edge of REQ (ini) or ACK (tgt) |
| 149 | */ |
| 150 | #define INPUT_DATA_REG 6 /* ro */ |
| 151 | |
| 152 | /* Write any value to this register to start a DMA receive */ |
| 153 | #define START_DMA_TARGET_RECEIVE_REG 6 /* wo */ |
| 154 | |
| 155 | /* Read this register to clear interrupt conditions */ |
| 156 | #define RESET_PARITY_INTERRUPT_REG 7 /* ro */ |
| 157 | |
| 158 | /* Write any value to this register to start an ini mode DMA receive */ |
| 159 | #define START_DMA_INITIATOR_RECEIVE_REG 7 /* wo */ |
| 160 | |
| 161 | #define C400_CONTROL_STATUS_REG NCR53C400_register_offset-8 /* rw */ |
| 162 | |
| 163 | #define CSR_RESET 0x80 /* wo Resets 53c400 */ |
| 164 | #define CSR_53C80_REG 0x80 /* ro 5380 registers busy */ |
| 165 | #define CSR_TRANS_DIR 0x40 /* rw Data transfer direction */ |
| 166 | #define CSR_SCSI_BUFF_INTR 0x20 /* rw Enable int on transfer ready */ |
| 167 | #define CSR_53C80_INTR 0x10 /* rw Enable 53c80 interrupts */ |
| 168 | #define CSR_SHARED_INTR 0x08 /* rw Interrupt sharing */ |
| 169 | #define CSR_HOST_BUF_NOT_RDY 0x04 /* ro Is Host buffer ready */ |
| 170 | #define CSR_SCSI_BUF_RDY 0x02 /* ro SCSI buffer read */ |
| 171 | #define CSR_GATED_53C80_IRQ 0x01 /* ro Last block xferred */ |
| 172 | |
| 173 | #if 0 |
| 174 | #define CSR_BASE CSR_SCSI_BUFF_INTR | CSR_53C80_INTR |
| 175 | #else |
| 176 | #define CSR_BASE CSR_53C80_INTR |
| 177 | #endif |
| 178 | |
| 179 | /* Number of 128-byte blocks to be transferred */ |
| 180 | #define C400_BLOCK_COUNTER_REG NCR53C400_register_offset-7 /* rw */ |
| 181 | |
| 182 | /* Resume transfer after disconnect */ |
| 183 | #define C400_RESUME_TRANSFER_REG NCR53C400_register_offset-6 /* wo */ |
| 184 | |
| 185 | /* Access to host buffer stack */ |
| 186 | #define C400_HOST_BUFFER NCR53C400_register_offset-4 /* rw */ |
| 187 | |
| 188 | |
| 189 | /* Note : PHASE_* macros are based on the values of the STATUS register */ |
| 190 | #define PHASE_MASK (SR_MSG | SR_CD | SR_IO) |
| 191 | |
| 192 | #define PHASE_DATAOUT 0 |
| 193 | #define PHASE_DATAIN SR_IO |
| 194 | #define PHASE_CMDOUT SR_CD |
| 195 | #define PHASE_STATIN (SR_CD | SR_IO) |
| 196 | #define PHASE_MSGOUT (SR_MSG | SR_CD) |
| 197 | #define PHASE_MSGIN (SR_MSG | SR_CD | SR_IO) |
| 198 | #define PHASE_UNKNOWN 0xff |
| 199 | |
| 200 | /* |
| 201 | * Convert status register phase to something we can use to set phase in |
| 202 | * the target register so we can get phase mismatch interrupts on DMA |
| 203 | * transfers. |
| 204 | */ |
| 205 | |
| 206 | #define PHASE_SR_TO_TCR(phase) ((phase) >> 2) |
| 207 | |
| 208 | /* |
| 209 | * The internal should_disconnect() function returns these based on the |
| 210 | * expected length of a disconnect if a device supports disconnect/ |
| 211 | * reconnect. |
| 212 | */ |
| 213 | |
| 214 | #define DISCONNECT_NONE 0 |
| 215 | #define DISCONNECT_TIME_TO_DATA 1 |
| 216 | #define DISCONNECT_LONG 2 |
| 217 | |
| 218 | /* |
Finn Thain | 76f13b9 | 2014-11-12 16:11:53 +1100 | [diff] [blame] | 219 | * "Special" value for the (unsigned char) command tag, to indicate |
| 220 | * I_T_L nexus instead of I_T_L_Q. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | */ |
| 222 | |
Finn Thain | 76f13b9 | 2014-11-12 16:11:53 +1100 | [diff] [blame] | 223 | #define TAG_NONE 0xff |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 224 | |
| 225 | /* |
| 226 | * These are "special" values for the irq and dma_channel fields of the |
| 227 | * Scsi_Host structure |
| 228 | */ |
| 229 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | #define DMA_NONE 255 |
| 231 | #define IRQ_AUTO 254 |
| 232 | #define DMA_AUTO 254 |
| 233 | #define PORT_AUTO 0xffff /* autoprobe io port for 53c400a */ |
| 234 | |
Finn Thain | 22f5f10 | 2014-11-12 16:11:56 +1100 | [diff] [blame] | 235 | #ifndef NO_IRQ |
| 236 | #define NO_IRQ 0 |
| 237 | #endif |
| 238 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 239 | #define FLAG_HAS_LAST_BYTE_SENT 1 /* NCR53c81 or better */ |
| 240 | #define FLAG_CHECK_LAST_BYTE_SENT 2 /* Only test once */ |
| 241 | #define FLAG_NCR53C400 4 /* NCR53c400 */ |
| 242 | #define FLAG_NO_PSEUDO_DMA 8 /* Inhibit DMA */ |
| 243 | #define FLAG_DTC3181E 16 /* DTC3181E */ |
Finn Thain | ef1081c | 2014-11-12 16:12:14 +1100 | [diff] [blame] | 244 | #define FLAG_LATE_DMA_SETUP 32 /* Setup NCR before DMA H/W */ |
Finn Thain | ca513fc | 2014-11-12 16:12:19 +1100 | [diff] [blame] | 245 | #define FLAG_TAGGED_QUEUING 64 /* as X3T9.2 spelled it */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 246 | |
| 247 | #ifndef ASM |
Finn Thain | 61d739a | 2014-11-12 16:12:20 +1100 | [diff] [blame^] | 248 | |
| 249 | #ifdef SUPPORT_TAGS |
| 250 | struct tag_alloc { |
| 251 | DECLARE_BITMAP(allocated, MAX_TAGS); |
| 252 | int nr_allocated; |
| 253 | int queue_size; |
| 254 | }; |
| 255 | #endif |
| 256 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 257 | struct NCR5380_hostdata { |
| 258 | NCR5380_implementation_fields; /* implementation specific */ |
| 259 | struct Scsi_Host *host; /* Host backpointer */ |
| 260 | unsigned char id_mask, id_higher_mask; /* 1 << id, all bits greater */ |
| 261 | unsigned char targets_present; /* targets we have connected |
| 262 | to, so we can call a select |
| 263 | failure a retryable condition */ |
| 264 | volatile unsigned char busy[8]; /* index = target, bit = lun */ |
| 265 | #if defined(REAL_DMA) || defined(REAL_DMA_POLL) |
| 266 | volatile int dma_len; /* requested length of DMA */ |
| 267 | #endif |
| 268 | volatile unsigned char last_message; /* last message OUT */ |
Finn Thain | 710ddd0 | 2014-11-12 16:12:02 +1100 | [diff] [blame] | 269 | volatile struct scsi_cmnd *connected; /* currently connected command */ |
| 270 | volatile struct scsi_cmnd *issue_queue; /* waiting to be issued */ |
| 271 | volatile struct scsi_cmnd *disconnected_queue; /* waiting for reconnect */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | volatile int restart_select; /* we have disconnected, |
| 273 | used to restart |
| 274 | NCR5380_select() */ |
| 275 | volatile unsigned aborted:1; /* flag, says aborted */ |
| 276 | int flags; |
| 277 | unsigned long time_expires; /* in jiffies, set prior to sleeping */ |
| 278 | int select_time; /* timer in select for target response */ |
Finn Thain | 710ddd0 | 2014-11-12 16:12:02 +1100 | [diff] [blame] | 279 | volatile struct scsi_cmnd *selecting; |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 280 | struct delayed_work coroutine; /* our co-routine */ |
Boaz Harrosh | 28424d3 | 2007-09-10 22:37:45 +0300 | [diff] [blame] | 281 | struct scsi_eh_save ses; |
Finn Thain | 8c32513 | 2014-11-12 16:11:58 +1100 | [diff] [blame] | 282 | char info[256]; |
Finn Thain | ef1081c | 2014-11-12 16:12:14 +1100 | [diff] [blame] | 283 | int read_overruns; /* number of bytes to cut from a |
| 284 | * transfer to handle chip overruns */ |
| 285 | int retain_dma_intr; |
Finn Thain | 61d739a | 2014-11-12 16:12:20 +1100 | [diff] [blame^] | 286 | #ifdef SUPPORT_TAGS |
| 287 | struct tag_alloc TagAlloc[8][8]; /* 8 targets and 8 LUNs */ |
| 288 | #endif |
Finn Thain | a9c2dc4 | 2014-11-12 16:11:59 +1100 | [diff] [blame] | 289 | #ifdef PSEUDO_DMA |
| 290 | unsigned spin_max_r; |
| 291 | unsigned spin_max_w; |
| 292 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 293 | }; |
| 294 | |
| 295 | #ifdef __KERNEL__ |
| 296 | |
Finn Thain | 9829e52 | 2014-03-18 11:42:21 +1100 | [diff] [blame] | 297 | #ifndef NDEBUG |
| 298 | #define NDEBUG (0) |
| 299 | #endif |
| 300 | |
Finn Thain | 16b9d87 | 2014-05-29 00:43:43 +1000 | [diff] [blame] | 301 | #define dprintk(flg, fmt, ...) \ |
Finn Thain | d61c542 | 2014-11-12 16:11:47 +1100 | [diff] [blame] | 302 | do { if ((NDEBUG) & (flg)) \ |
| 303 | printk(KERN_DEBUG fmt, ## __VA_ARGS__); } while (0) |
Finn Thain | 16b9d87 | 2014-05-29 00:43:43 +1000 | [diff] [blame] | 304 | |
Finn Thain | 9829e52 | 2014-03-18 11:42:21 +1100 | [diff] [blame] | 305 | #if NDEBUG |
Finn Thain | 9829e52 | 2014-03-18 11:42:21 +1100 | [diff] [blame] | 306 | #define NCR5380_dprint(flg, arg) \ |
| 307 | do { if ((NDEBUG) & (flg)) NCR5380_print(arg); } while (0) |
| 308 | #define NCR5380_dprint_phase(flg, arg) \ |
| 309 | do { if ((NDEBUG) & (flg)) NCR5380_print_phase(arg); } while (0) |
| 310 | static void NCR5380_print_phase(struct Scsi_Host *instance); |
| 311 | static void NCR5380_print(struct Scsi_Host *instance); |
| 312 | #else |
Finn Thain | 52a6a1c | 2014-03-18 11:42:18 +1100 | [diff] [blame] | 313 | #define NCR5380_dprint(flg, arg) do {} while (0) |
| 314 | #define NCR5380_dprint_phase(flg, arg) do {} while (0) |
Finn Thain | 9829e52 | 2014-03-18 11:42:21 +1100 | [diff] [blame] | 315 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 316 | |
| 317 | #if defined(AUTOPROBE_IRQ) |
| 318 | static int NCR5380_probe_irq(struct Scsi_Host *instance, int possible); |
| 319 | #endif |
| 320 | static int NCR5380_init(struct Scsi_Host *instance, int flags); |
| 321 | static void NCR5380_exit(struct Scsi_Host *instance); |
| 322 | static void NCR5380_information_transfer(struct Scsi_Host *instance); |
| 323 | #ifndef DONT_USE_INTR |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 324 | static irqreturn_t NCR5380_intr(int irq, void *dev_id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 325 | #endif |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 326 | static void NCR5380_main(struct work_struct *work); |
Finn Thain | 8c32513 | 2014-11-12 16:11:58 +1100 | [diff] [blame] | 327 | static const char *NCR5380_info(struct Scsi_Host *instance); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 328 | static void NCR5380_reselect(struct Scsi_Host *instance); |
Finn Thain | 710ddd0 | 2014-11-12 16:12:02 +1100 | [diff] [blame] | 329 | static int NCR5380_select(struct Scsi_Host *instance, struct scsi_cmnd *cmd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 330 | #if defined(PSEUDO_DMA) || defined(REAL_DMA) || defined(REAL_DMA_POLL) |
| 331 | static int NCR5380_transfer_dma(struct Scsi_Host *instance, unsigned char *phase, int *count, unsigned char **data); |
| 332 | #endif |
| 333 | static int NCR5380_transfer_pio(struct Scsi_Host *instance, unsigned char *phase, int *count, unsigned char **data); |
| 334 | |
| 335 | #if (defined(REAL_DMA) || defined(REAL_DMA_POLL)) |
| 336 | |
| 337 | #if defined(i386) || defined(__alpha__) |
| 338 | |
| 339 | /** |
| 340 | * NCR5380_pc_dma_setup - setup ISA DMA |
| 341 | * @instance: adapter to set up |
| 342 | * @ptr: block to transfer (virtual address) |
| 343 | * @count: number of bytes to transfer |
| 344 | * @mode: DMA controller mode to use |
| 345 | * |
| 346 | * Program the DMA controller ready to perform an ISA DMA transfer |
| 347 | * on this chip. |
| 348 | * |
| 349 | * Locks: takes and releases the ISA DMA lock. |
| 350 | */ |
| 351 | |
| 352 | static __inline__ int NCR5380_pc_dma_setup(struct Scsi_Host *instance, unsigned char *ptr, unsigned int count, unsigned char mode) |
| 353 | { |
| 354 | unsigned limit; |
| 355 | unsigned long bus_addr = virt_to_bus(ptr); |
| 356 | unsigned long flags; |
| 357 | |
| 358 | if (instance->dma_channel <= 3) { |
| 359 | if (count > 65536) |
| 360 | count = 65536; |
| 361 | limit = 65536 - (bus_addr & 0xFFFF); |
| 362 | } else { |
| 363 | if (count > 65536 * 2) |
| 364 | count = 65536 * 2; |
| 365 | limit = 65536 * 2 - (bus_addr & 0x1FFFF); |
| 366 | } |
| 367 | |
| 368 | if (count > limit) |
| 369 | count = limit; |
| 370 | |
| 371 | if ((count & 1) || (bus_addr & 1)) |
| 372 | panic("scsi%d : attempted unaligned DMA transfer\n", instance->host_no); |
| 373 | |
| 374 | flags=claim_dma_lock(); |
| 375 | disable_dma(instance->dma_channel); |
| 376 | clear_dma_ff(instance->dma_channel); |
| 377 | set_dma_addr(instance->dma_channel, bus_addr); |
| 378 | set_dma_count(instance->dma_channel, count); |
| 379 | set_dma_mode(instance->dma_channel, mode); |
| 380 | enable_dma(instance->dma_channel); |
| 381 | release_dma_lock(flags); |
| 382 | |
| 383 | return count; |
| 384 | } |
| 385 | |
| 386 | /** |
| 387 | * NCR5380_pc_dma_write_setup - setup ISA DMA write |
| 388 | * @instance: adapter to set up |
| 389 | * @ptr: block to transfer (virtual address) |
| 390 | * @count: number of bytes to transfer |
| 391 | * |
| 392 | * Program the DMA controller ready to perform an ISA DMA write to the |
| 393 | * SCSI controller. |
| 394 | * |
| 395 | * Locks: called routines take and release the ISA DMA lock. |
| 396 | */ |
| 397 | |
| 398 | static __inline__ int NCR5380_pc_dma_write_setup(struct Scsi_Host *instance, unsigned char *src, unsigned int count) |
| 399 | { |
| 400 | return NCR5380_pc_dma_setup(instance, src, count, DMA_MODE_WRITE); |
| 401 | } |
| 402 | |
| 403 | /** |
| 404 | * NCR5380_pc_dma_read_setup - setup ISA DMA read |
| 405 | * @instance: adapter to set up |
| 406 | * @ptr: block to transfer (virtual address) |
| 407 | * @count: number of bytes to transfer |
| 408 | * |
| 409 | * Program the DMA controller ready to perform an ISA DMA read from the |
| 410 | * SCSI controller. |
| 411 | * |
| 412 | * Locks: called routines take and release the ISA DMA lock. |
| 413 | */ |
| 414 | |
| 415 | static __inline__ int NCR5380_pc_dma_read_setup(struct Scsi_Host *instance, unsigned char *src, unsigned int count) |
| 416 | { |
| 417 | return NCR5380_pc_dma_setup(instance, src, count, DMA_MODE_READ); |
| 418 | } |
| 419 | |
| 420 | /** |
| 421 | * NCR5380_pc_dma_residual - return bytes left |
| 422 | * @instance: adapter |
| 423 | * |
| 424 | * Reports the number of bytes left over after the DMA was terminated. |
| 425 | * |
| 426 | * Locks: takes and releases the ISA DMA lock. |
| 427 | */ |
| 428 | |
| 429 | static __inline__ int NCR5380_pc_dma_residual(struct Scsi_Host *instance) |
| 430 | { |
| 431 | unsigned long flags; |
| 432 | int tmp; |
| 433 | |
| 434 | flags = claim_dma_lock(); |
| 435 | clear_dma_ff(instance->dma_channel); |
| 436 | tmp = get_dma_residue(instance->dma_channel); |
| 437 | release_dma_lock(flags); |
| 438 | |
| 439 | return tmp; |
| 440 | } |
| 441 | #endif /* defined(i386) || defined(__alpha__) */ |
| 442 | #endif /* defined(REAL_DMA) */ |
| 443 | #endif /* __KERNEL__ */ |
| 444 | #endif /* ndef ASM */ |
| 445 | #endif /* NCR5380_H */ |