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1da177e4 LT |
1 | #include <linux/types.h> |
2 | #include <linux/mm.h> | |
5a0e3ad6 | 3 | #include <linux/slab.h> |
1da177e4 | 4 | #include <linux/blkdev.h> |
1da177e4 LT |
5 | #include <linux/ioport.h> |
6 | #include <linux/init.h> | |
7 | #include <linux/spinlock.h> | |
8 | #include <linux/interrupt.h> | |
9 | ||
10 | #include <asm/setup.h> | |
11 | #include <asm/page.h> | |
12 | #include <asm/pgtable.h> | |
13 | #include <asm/amigaints.h> | |
14 | #include <asm/amigahw.h> | |
15 | #include <asm/irq.h> | |
16 | ||
17 | #include "scsi.h" | |
18 | #include <scsi/scsi_host.h> | |
19 | #include "wd33c93.h" | |
20 | #include "a3000.h" | |
21 | ||
21351013 | 22 | #include <linux/stat.h> |
1da177e4 | 23 | |
21351013 GU |
24 | |
25 | #define DMA(ptr) ((a3000_scsiregs *)((ptr)->base)) | |
1da177e4 LT |
26 | |
27 | static struct Scsi_Host *a3000_host = NULL; | |
28 | ||
9387edbe AB |
29 | static int a3000_release(struct Scsi_Host *instance); |
30 | ||
21351013 | 31 | static irqreturn_t a3000_intr(int irq, void *dummy) |
1da177e4 LT |
32 | { |
33 | unsigned long flags; | |
34 | unsigned int status = DMA(a3000_host)->ISTR; | |
35 | ||
36 | if (!(status & ISTR_INT_P)) | |
37 | return IRQ_NONE; | |
21351013 | 38 | if (status & ISTR_INTS) { |
1da177e4 | 39 | spin_lock_irqsave(a3000_host->host_lock, flags); |
21351013 | 40 | wd33c93_intr(a3000_host); |
1da177e4 LT |
41 | spin_unlock_irqrestore(a3000_host->host_lock, flags); |
42 | return IRQ_HANDLED; | |
43 | } | |
44 | printk("Non-serviced A3000 SCSI-interrupt? ISTR = %02x\n", status); | |
45 | return IRQ_NONE; | |
46 | } | |
47 | ||
65396410 | 48 | static int dma_setup(struct scsi_cmnd *cmd, int dir_in) |
1da177e4 | 49 | { |
afdbbc16 | 50 | struct WD33C93_hostdata *hdata = shost_priv(a3000_host); |
21351013 GU |
51 | unsigned short cntr = CNTR_PDMD | CNTR_INTEN; |
52 | unsigned long addr = virt_to_bus(cmd->SCp.ptr); | |
53 | ||
54 | /* | |
55 | * if the physical address has the wrong alignment, or if | |
56 | * physical address is bad, or if it is a write and at the | |
57 | * end of a physical memory chunk, then allocate a bounce | |
58 | * buffer | |
59 | */ | |
60 | if (addr & A3000_XFER_MASK) { | |
afdbbc16 GU |
61 | hdata->dma_bounce_len = (cmd->SCp.this_residual + 511) & ~0x1ff; |
62 | hdata->dma_bounce_buffer = kmalloc(hdata->dma_bounce_len, | |
63 | GFP_KERNEL); | |
21351013 GU |
64 | |
65 | /* can't allocate memory; use PIO */ | |
afdbbc16 GU |
66 | if (!hdata->dma_bounce_buffer) { |
67 | hdata->dma_bounce_len = 0; | |
21351013 GU |
68 | return 1; |
69 | } | |
70 | ||
71 | if (!dir_in) { | |
72 | /* copy to bounce buffer for a write */ | |
afdbbc16 GU |
73 | memcpy(hdata->dma_bounce_buffer, cmd->SCp.ptr, |
74 | cmd->SCp.this_residual); | |
21351013 GU |
75 | } |
76 | ||
afdbbc16 | 77 | addr = virt_to_bus(hdata->dma_bounce_buffer); |
1da177e4 LT |
78 | } |
79 | ||
21351013 GU |
80 | /* setup dma direction */ |
81 | if (!dir_in) | |
82 | cntr |= CNTR_DDIR; | |
1da177e4 | 83 | |
21351013 | 84 | /* remember direction */ |
afdbbc16 | 85 | hdata->dma_dir = dir_in; |
1da177e4 | 86 | |
21351013 | 87 | DMA(a3000_host)->CNTR = cntr; |
1da177e4 | 88 | |
21351013 GU |
89 | /* setup DMA *physical* address */ |
90 | DMA(a3000_host)->ACR = addr; | |
1da177e4 | 91 | |
21351013 GU |
92 | if (dir_in) { |
93 | /* invalidate any cache */ | |
94 | cache_clear(addr, cmd->SCp.this_residual); | |
95 | } else { | |
96 | /* push any dirty cache */ | |
97 | cache_push(addr, cmd->SCp.this_residual); | |
98 | } | |
1da177e4 | 99 | |
21351013 GU |
100 | /* start DMA */ |
101 | mb(); /* make sure setup is completed */ | |
102 | DMA(a3000_host)->ST_DMA = 1; | |
103 | mb(); /* make sure DMA has started before next IO */ | |
1da177e4 | 104 | |
21351013 GU |
105 | /* return success */ |
106 | return 0; | |
1da177e4 LT |
107 | } |
108 | ||
65396410 HK |
109 | static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt, |
110 | int status) | |
1da177e4 | 111 | { |
afdbbc16 GU |
112 | struct WD33C93_hostdata *hdata = shost_priv(instance); |
113 | ||
21351013 GU |
114 | /* disable SCSI interrupts */ |
115 | unsigned short cntr = CNTR_PDMD; | |
116 | ||
afdbbc16 | 117 | if (!hdata->dma_dir) |
21351013 GU |
118 | cntr |= CNTR_DDIR; |
119 | ||
120 | DMA(instance)->CNTR = cntr; | |
121 | mb(); /* make sure CNTR is updated before next IO */ | |
122 | ||
123 | /* flush if we were reading */ | |
afdbbc16 | 124 | if (hdata->dma_dir) { |
21351013 GU |
125 | DMA(instance)->FLUSH = 1; |
126 | mb(); /* don't allow prefetch */ | |
127 | while (!(DMA(instance)->ISTR & ISTR_FE_FLG)) | |
128 | barrier(); | |
129 | mb(); /* no IO until FLUSH is done */ | |
130 | } | |
131 | ||
132 | /* clear a possible interrupt */ | |
133 | /* I think that this CINT is only necessary if you are | |
134 | * using the terminal count features. HM 7 Mar 1994 | |
135 | */ | |
136 | DMA(instance)->CINT = 1; | |
137 | ||
138 | /* stop DMA */ | |
139 | DMA(instance)->SP_DMA = 1; | |
140 | mb(); /* make sure DMA is stopped before next IO */ | |
141 | ||
142 | /* restore the CONTROL bits (minus the direction flag) */ | |
143 | DMA(instance)->CNTR = CNTR_PDMD | CNTR_INTEN; | |
144 | mb(); /* make sure CNTR is updated before next IO */ | |
145 | ||
146 | /* copy from a bounce buffer, if necessary */ | |
afdbbc16 | 147 | if (status && hdata->dma_bounce_buffer) { |
21351013 | 148 | if (SCpnt) { |
afdbbc16 | 149 | if (hdata->dma_dir && SCpnt) |
21351013 | 150 | memcpy(SCpnt->SCp.ptr, |
afdbbc16 | 151 | hdata->dma_bounce_buffer, |
21351013 | 152 | SCpnt->SCp.this_residual); |
afdbbc16 GU |
153 | kfree(hdata->dma_bounce_buffer); |
154 | hdata->dma_bounce_buffer = NULL; | |
155 | hdata->dma_bounce_len = 0; | |
21351013 | 156 | } else { |
afdbbc16 GU |
157 | kfree(hdata->dma_bounce_buffer); |
158 | hdata->dma_bounce_buffer = NULL; | |
159 | hdata->dma_bounce_len = 0; | |
21351013 | 160 | } |
1da177e4 | 161 | } |
1da177e4 LT |
162 | } |
163 | ||
9387edbe | 164 | static int __init a3000_detect(struct scsi_host_template *tpnt) |
1da177e4 | 165 | { |
21351013 | 166 | wd33c93_regs regs; |
afdbbc16 | 167 | struct WD33C93_hostdata *hdata; |
21351013 GU |
168 | |
169 | if (!MACH_IS_AMIGA || !AMIGAHW_PRESENT(A3000_SCSI)) | |
170 | return 0; | |
171 | if (!request_mem_region(0xDD0000, 256, "wd33c93")) | |
172 | return 0; | |
173 | ||
174 | tpnt->proc_name = "A3000"; | |
175 | tpnt->proc_info = &wd33c93_proc_info; | |
176 | ||
177 | a3000_host = scsi_register(tpnt, sizeof(struct WD33C93_hostdata)); | |
178 | if (a3000_host == NULL) | |
179 | goto fail_register; | |
180 | ||
181 | a3000_host->base = ZTWO_VADDR(0xDD0000); | |
182 | a3000_host->irq = IRQ_AMIGA_PORTS; | |
183 | DMA(a3000_host)->DAWR = DAWR_A3000; | |
184 | regs.SASR = &(DMA(a3000_host)->SASR); | |
185 | regs.SCMD = &(DMA(a3000_host)->SCMD); | |
afdbbc16 GU |
186 | hdata = shost_priv(a3000_host); |
187 | hdata->no_sync = 0xff; | |
188 | hdata->fast = 0; | |
189 | hdata->dma_mode = CTRL_DMA; | |
21351013 GU |
190 | wd33c93_init(a3000_host, regs, dma_setup, dma_stop, WD33C93_FS_12_15); |
191 | if (request_irq(IRQ_AMIGA_PORTS, a3000_intr, IRQF_SHARED, "A3000 SCSI", | |
192 | a3000_intr)) | |
193 | goto fail_irq; | |
194 | DMA(a3000_host)->CNTR = CNTR_PDMD | CNTR_INTEN; | |
195 | ||
196 | return 1; | |
1da177e4 LT |
197 | |
198 | fail_irq: | |
21351013 | 199 | scsi_unregister(a3000_host); |
1da177e4 | 200 | fail_register: |
21351013 GU |
201 | release_mem_region(0xDD0000, 256); |
202 | return 0; | |
1da177e4 LT |
203 | } |
204 | ||
65396410 | 205 | static int a3000_bus_reset(struct scsi_cmnd *cmd) |
1da177e4 LT |
206 | { |
207 | /* FIXME perform bus-specific reset */ | |
21351013 | 208 | |
df0ae249 JG |
209 | /* FIXME 2: kill this entire function, which should |
210 | cause mid-layer to call wd33c93_host_reset anyway? */ | |
68b3aa7c JG |
211 | |
212 | spin_lock_irq(cmd->device->host->host_lock); | |
1da177e4 | 213 | wd33c93_host_reset(cmd); |
68b3aa7c JG |
214 | spin_unlock_irq(cmd->device->host->host_lock); |
215 | ||
1da177e4 LT |
216 | return SUCCESS; |
217 | } | |
218 | ||
219 | #define HOSTS_C | |
220 | ||
d0be4a7d | 221 | static struct scsi_host_template driver_template = { |
1da177e4 LT |
222 | .proc_name = "A3000", |
223 | .name = "Amiga 3000 built-in SCSI", | |
224 | .detect = a3000_detect, | |
225 | .release = a3000_release, | |
226 | .queuecommand = wd33c93_queuecommand, | |
227 | .eh_abort_handler = wd33c93_abort, | |
228 | .eh_bus_reset_handler = a3000_bus_reset, | |
229 | .eh_host_reset_handler = wd33c93_host_reset, | |
230 | .can_queue = CAN_QUEUE, | |
231 | .this_id = 7, | |
232 | .sg_tablesize = SG_ALL, | |
233 | .cmd_per_lun = CMD_PER_LUN, | |
234 | .use_clustering = ENABLE_CLUSTERING | |
235 | }; | |
236 | ||
237 | ||
238 | #include "scsi_module.c" | |
239 | ||
9387edbe | 240 | static int a3000_release(struct Scsi_Host *instance) |
1da177e4 | 241 | { |
21351013 GU |
242 | DMA(instance)->CNTR = 0; |
243 | release_mem_region(0xDD0000, 256); | |
244 | free_irq(IRQ_AMIGA_PORTS, a3000_intr); | |
245 | return 1; | |
1da177e4 LT |
246 | } |
247 | ||
248 | MODULE_LICENSE("GPL"); |