4 * Copyright 1993, Drew Eckhardt
6 * (Unix consulting and custom programming)
10 * For more information, please consult
13 * SCSI Protocol Controller
15 * NCR Microelectronics
16 * 1635 Aeroplaza Drive
17 * Colorado Springs, CO 80916
25 #include <linux/delay.h>
26 #include <linux/interrupt.h>
27 #include <linux/list.h>
28 #include <linux/workqueue.h>
29 #include <scsi/scsi_dbg.h>
30 #include <scsi/scsi_eh.h>
31 #include <scsi/scsi_transport_spi.h>
33 #define NDEBUG_ARBITRATION 0x1
34 #define NDEBUG_AUTOSENSE 0x2
35 #define NDEBUG_DMA 0x4
36 #define NDEBUG_HANDSHAKE 0x8
37 #define NDEBUG_INFORMATION 0x10
38 #define NDEBUG_INIT 0x20
39 #define NDEBUG_INTR 0x40
40 #define NDEBUG_LINKED 0x80
41 #define NDEBUG_MAIN 0x100
42 #define NDEBUG_NO_DATAOUT 0x200
43 #define NDEBUG_NO_WRITE 0x400
44 #define NDEBUG_PIO 0x800
45 #define NDEBUG_PSEUDO_DMA 0x1000
46 #define NDEBUG_QUEUES 0x2000
47 #define NDEBUG_RESELECTION 0x4000
48 #define NDEBUG_SELECTION 0x8000
49 #define NDEBUG_USLEEP 0x10000
50 #define NDEBUG_LAST_BYTE_SENT 0x20000
51 #define NDEBUG_RESTART_SELECT 0x40000
52 #define NDEBUG_EXTENDED 0x80000
53 #define NDEBUG_C400_PREAD 0x100000
54 #define NDEBUG_C400_PWRITE 0x200000
55 #define NDEBUG_LISTS 0x400000
56 #define NDEBUG_ABORT 0x800000
57 #define NDEBUG_TAGS 0x1000000
58 #define NDEBUG_MERGING 0x2000000
60 #define NDEBUG_ANY 0xFFFFFFFFUL
63 * The contents of the OUTPUT DATA register are asserted on the bus when
64 * either arbitration is occurring or the phase-indicating signals (
65 * IO, CD, MSG) in the TARGET COMMAND register and the ASSERT DATA
66 * bit in the INITIATOR COMMAND register is set.
69 #define OUTPUT_DATA_REG 0 /* wo DATA lines on SCSI bus */
70 #define CURRENT_SCSI_DATA_REG 0 /* ro same */
72 #define INITIATOR_COMMAND_REG 1 /* rw */
73 #define ICR_ASSERT_RST 0x80 /* rw Set to assert RST */
74 #define ICR_ARBITRATION_PROGRESS 0x40 /* ro Indicates arbitration complete */
75 #define ICR_TRI_STATE 0x40 /* wo Set to tri-state drivers */
76 #define ICR_ARBITRATION_LOST 0x20 /* ro Indicates arbitration lost */
77 #define ICR_DIFF_ENABLE 0x20 /* wo Set to enable diff. drivers */
78 #define ICR_ASSERT_ACK 0x10 /* rw ini Set to assert ACK */
79 #define ICR_ASSERT_BSY 0x08 /* rw Set to assert BSY */
80 #define ICR_ASSERT_SEL 0x04 /* rw Set to assert SEL */
81 #define ICR_ASSERT_ATN 0x02 /* rw Set to assert ATN */
82 #define ICR_ASSERT_DATA 0x01 /* rw SCSI_DATA_REG is asserted */
85 #define ICR_BASE ICR_DIFF_ENABLE
92 * Note : BLOCK_DMA code will keep DRQ asserted for the duration of the
93 * transfer, causing the chip to hog the bus. You probably don't want
96 #define MR_BLOCK_DMA_MODE 0x80 /* rw block mode DMA */
97 #define MR_TARGET 0x40 /* rw target mode */
98 #define MR_ENABLE_PAR_CHECK 0x20 /* rw enable parity checking */
99 #define MR_ENABLE_PAR_INTR 0x10 /* rw enable bad parity interrupt */
100 #define MR_ENABLE_EOP_INTR 0x08 /* rw enable eop interrupt */
101 #define MR_MONITOR_BSY 0x04 /* rw enable int on unexpected bsy fail */
102 #define MR_DMA_MODE 0x02 /* rw DMA / pseudo DMA mode */
103 #define MR_ARBITRATE 0x01 /* rw start arbitration */
106 #define MR_BASE MR_ENABLE_PAR_CHECK
111 #define TARGET_COMMAND_REG 3
112 #define TCR_LAST_BYTE_SENT 0x80 /* ro DMA done */
113 #define TCR_ASSERT_REQ 0x08 /* tgt rw assert REQ */
114 #define TCR_ASSERT_MSG 0x04 /* tgt rw assert MSG */
115 #define TCR_ASSERT_CD 0x02 /* tgt rw assert CD */
116 #define TCR_ASSERT_IO 0x01 /* tgt rw assert IO */
118 #define STATUS_REG 4 /* ro */
120 * Note : a set bit indicates an active signal, driven by us or another
133 * Setting a bit in this register will cause an interrupt to be generated when
134 * BSY is false and SEL true and this bit is asserted on the bus.
136 #define SELECT_ENABLE_REG 4 /* wo */
138 #define BUS_AND_STATUS_REG 5 /* ro */
139 #define BASR_END_DMA_TRANSFER 0x80 /* ro set on end of transfer */
140 #define BASR_DRQ 0x40 /* ro mirror of DRQ pin */
141 #define BASR_PARITY_ERROR 0x20 /* ro parity error detected */
142 #define BASR_IRQ 0x10 /* ro mirror of IRQ pin */
143 #define BASR_PHASE_MATCH 0x08 /* ro Set when MSG CD IO match TCR */
144 #define BASR_BUSY_ERROR 0x04 /* ro Unexpected change to inactive state */
145 #define BASR_ATN 0x02 /* ro BUS status */
146 #define BASR_ACK 0x01 /* ro BUS status */
148 /* Write any value to this register to start a DMA send */
149 #define START_DMA_SEND_REG 5 /* wo */
152 * Used in DMA transfer mode, data is latched from the SCSI bus on
153 * the falling edge of REQ (ini) or ACK (tgt)
155 #define INPUT_DATA_REG 6 /* ro */
157 /* Write any value to this register to start a DMA receive */
158 #define START_DMA_TARGET_RECEIVE_REG 6 /* wo */
160 /* Read this register to clear interrupt conditions */
161 #define RESET_PARITY_INTERRUPT_REG 7 /* ro */
163 /* Write any value to this register to start an ini mode DMA receive */
164 #define START_DMA_INITIATOR_RECEIVE_REG 7 /* wo */
166 /* NCR 53C400(A) Control Status Register bits: */
167 #define CSR_RESET 0x80 /* wo Resets 53c400 */
168 #define CSR_53C80_REG 0x80 /* ro 5380 registers busy */
169 #define CSR_TRANS_DIR 0x40 /* rw Data transfer direction */
170 #define CSR_SCSI_BUFF_INTR 0x20 /* rw Enable int on transfer ready */
171 #define CSR_53C80_INTR 0x10 /* rw Enable 53c80 interrupts */
172 #define CSR_SHARED_INTR 0x08 /* rw Interrupt sharing */
173 #define CSR_HOST_BUF_NOT_RDY 0x04 /* ro Is Host buffer ready */
174 #define CSR_SCSI_BUF_RDY 0x02 /* ro SCSI buffer read */
175 #define CSR_GATED_53C80_IRQ 0x01 /* ro Last block xferred */
178 #define CSR_BASE CSR_SCSI_BUFF_INTR | CSR_53C80_INTR
180 #define CSR_BASE CSR_53C80_INTR
183 /* Note : PHASE_* macros are based on the values of the STATUS register */
184 #define PHASE_MASK (SR_MSG | SR_CD | SR_IO)
186 #define PHASE_DATAOUT 0
187 #define PHASE_DATAIN SR_IO
188 #define PHASE_CMDOUT SR_CD
189 #define PHASE_STATIN (SR_CD | SR_IO)
190 #define PHASE_MSGOUT (SR_MSG | SR_CD)
191 #define PHASE_MSGIN (SR_MSG | SR_CD | SR_IO)
192 #define PHASE_UNKNOWN 0xff
195 * Convert status register phase to something we can use to set phase in
196 * the target register so we can get phase mismatch interrupts on DMA
200 #define PHASE_SR_TO_TCR(phase) ((phase) >> 2)
203 * "Special" value for the (unsigned char) command tag, to indicate
204 * I_T_L nexus instead of I_T_L_Q.
207 #define TAG_NONE 0xff
210 * These are "special" values for the irq and dma_channel fields of the
211 * Scsi_Host structure
217 #define PORT_AUTO 0xffff /* autoprobe io port for 53c400a */
223 #define FLAG_NO_DMA_FIXUP 1 /* No DMA errata workarounds */
224 #define FLAG_NO_PSEUDO_DMA 8 /* Inhibit DMA */
225 #define FLAG_LATE_DMA_SETUP 32 /* Setup NCR before DMA H/W */
226 #define FLAG_TAGGED_QUEUING 64 /* as X3T9.2 spelled it */
227 #define FLAG_TOSHIBA_DELAY 128 /* Allow for borken CD-ROMs */
231 DECLARE_BITMAP(allocated, MAX_TAGS);
237 struct NCR5380_hostdata {
238 NCR5380_implementation_fields; /* implementation specific */
239 struct Scsi_Host *host; /* Host backpointer */
240 unsigned char id_mask, id_higher_mask; /* 1 << id, all bits greater */
241 unsigned char busy[8]; /* index = target, bit = lun */
242 #if defined(REAL_DMA) || defined(REAL_DMA_POLL)
243 int dma_len; /* requested length of DMA */
245 unsigned char last_message; /* last message OUT */
246 struct scsi_cmnd *connected; /* currently connected cmnd */
247 struct scsi_cmnd *selecting; /* cmnd to be connected */
248 struct list_head unissued; /* waiting to be issued */
249 struct list_head autosense; /* priority issue queue */
250 struct list_head disconnected; /* waiting for reconnect */
251 spinlock_t lock; /* protects this struct */
253 struct scsi_eh_save ses;
254 struct scsi_cmnd *sensing;
256 int read_overruns; /* number of bytes to cut from a
257 * transfer to handle chip overruns */
258 struct work_struct main_task;
260 struct tag_alloc TagAlloc[8][8]; /* 8 targets and 8 LUNs */
266 struct workqueue_struct *work_q;
267 unsigned long accesses_per_ms; /* chip register accesses per ms */
273 struct list_head list;
276 #define NCR5380_CMD_SIZE (sizeof(struct NCR5380_cmd))
278 static inline struct scsi_cmnd *NCR5380_to_scmd(struct NCR5380_cmd *ncmd_ptr)
280 return ((struct scsi_cmnd *)ncmd_ptr) - 1;
287 #define dprintk(flg, fmt, ...) \
288 do { if ((NDEBUG) & (flg)) \
289 printk(KERN_DEBUG fmt, ## __VA_ARGS__); } while (0)
291 #define dsprintk(flg, host, fmt, ...) \
292 do { if ((NDEBUG) & (flg)) \
293 shost_printk(KERN_DEBUG, host, fmt, ## __VA_ARGS__); \
297 #define NCR5380_dprint(flg, arg) \
298 do { if ((NDEBUG) & (flg)) NCR5380_print(arg); } while (0)
299 #define NCR5380_dprint_phase(flg, arg) \
300 do { if ((NDEBUG) & (flg)) NCR5380_print_phase(arg); } while (0)
301 static void NCR5380_print_phase(struct Scsi_Host *instance);
302 static void NCR5380_print(struct Scsi_Host *instance);
304 #define NCR5380_dprint(flg, arg) do {} while (0)
305 #define NCR5380_dprint_phase(flg, arg) do {} while (0)
308 #if defined(AUTOPROBE_IRQ)
309 static int NCR5380_probe_irq(struct Scsi_Host *instance, int possible);
311 static int NCR5380_init(struct Scsi_Host *instance, int flags);
312 static int NCR5380_maybe_reset_bus(struct Scsi_Host *);
313 static void NCR5380_exit(struct Scsi_Host *instance);
314 static void NCR5380_information_transfer(struct Scsi_Host *instance);
315 #ifndef DONT_USE_INTR
316 static irqreturn_t NCR5380_intr(int irq, void *dev_id);
318 static void NCR5380_main(struct work_struct *work);
319 static const char *NCR5380_info(struct Scsi_Host *instance);
320 static void NCR5380_reselect(struct Scsi_Host *instance);
321 static struct scsi_cmnd *NCR5380_select(struct Scsi_Host *, struct scsi_cmnd *);
322 #if defined(PSEUDO_DMA) || defined(REAL_DMA) || defined(REAL_DMA_POLL)
323 static int NCR5380_transfer_dma(struct Scsi_Host *instance, unsigned char *phase, int *count, unsigned char **data);
325 static int NCR5380_transfer_pio(struct Scsi_Host *instance, unsigned char *phase, int *count, unsigned char **data);
327 #if (defined(REAL_DMA) || defined(REAL_DMA_POLL))
329 #if defined(i386) || defined(__alpha__)
332 * NCR5380_pc_dma_setup - setup ISA DMA
333 * @instance: adapter to set up
334 * @ptr: block to transfer (virtual address)
335 * @count: number of bytes to transfer
336 * @mode: DMA controller mode to use
338 * Program the DMA controller ready to perform an ISA DMA transfer
341 * Locks: takes and releases the ISA DMA lock.
344 static __inline__ int NCR5380_pc_dma_setup(struct Scsi_Host *instance, unsigned char *ptr, unsigned int count, unsigned char mode)
347 unsigned long bus_addr = virt_to_bus(ptr);
350 if (instance->dma_channel <= 3) {
353 limit = 65536 - (bus_addr & 0xFFFF);
355 if (count > 65536 * 2)
357 limit = 65536 * 2 - (bus_addr & 0x1FFFF);
363 if ((count & 1) || (bus_addr & 1))
364 panic("scsi%d : attempted unaligned DMA transfer\n", instance->host_no);
366 flags=claim_dma_lock();
367 disable_dma(instance->dma_channel);
368 clear_dma_ff(instance->dma_channel);
369 set_dma_addr(instance->dma_channel, bus_addr);
370 set_dma_count(instance->dma_channel, count);
371 set_dma_mode(instance->dma_channel, mode);
372 enable_dma(instance->dma_channel);
373 release_dma_lock(flags);
379 * NCR5380_pc_dma_write_setup - setup ISA DMA write
380 * @instance: adapter to set up
381 * @ptr: block to transfer (virtual address)
382 * @count: number of bytes to transfer
384 * Program the DMA controller ready to perform an ISA DMA write to the
387 * Locks: called routines take and release the ISA DMA lock.
390 static __inline__ int NCR5380_pc_dma_write_setup(struct Scsi_Host *instance, unsigned char *src, unsigned int count)
392 return NCR5380_pc_dma_setup(instance, src, count, DMA_MODE_WRITE);
396 * NCR5380_pc_dma_read_setup - setup ISA DMA read
397 * @instance: adapter to set up
398 * @ptr: block to transfer (virtual address)
399 * @count: number of bytes to transfer
401 * Program the DMA controller ready to perform an ISA DMA read from the
404 * Locks: called routines take and release the ISA DMA lock.
407 static __inline__ int NCR5380_pc_dma_read_setup(struct Scsi_Host *instance, unsigned char *src, unsigned int count)
409 return NCR5380_pc_dma_setup(instance, src, count, DMA_MODE_READ);
413 * NCR5380_pc_dma_residual - return bytes left
416 * Reports the number of bytes left over after the DMA was terminated.
418 * Locks: takes and releases the ISA DMA lock.
421 static __inline__ int NCR5380_pc_dma_residual(struct Scsi_Host *instance)
426 flags = claim_dma_lock();
427 clear_dma_ff(instance->dma_channel);
428 tmp = get_dma_residue(instance->dma_channel);
429 release_dma_lock(flags);
433 #endif /* defined(i386) || defined(__alpha__) */
434 #endif /* defined(REAL_DMA) */
435 #endif /* __KERNEL__ */
436 #endif /* NCR5380_H */