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1da177e4 LT |
1 | #include <linux/types.h> |
2 | #include <linux/mm.h> | |
3 | #include <linux/blkdev.h> | |
4 | #include <linux/sched.h> | |
5 | #include <linux/version.h> | |
6 | #include <linux/init.h> | |
7 | #include <linux/interrupt.h> | |
8 | ||
9 | #include <asm/setup.h> | |
10 | #include <asm/page.h> | |
11 | #include <asm/pgtable.h> | |
12 | #include <asm/amigaints.h> | |
13 | #include <asm/amigahw.h> | |
14 | #include <linux/zorro.h> | |
15 | #include <asm/irq.h> | |
16 | #include <linux/spinlock.h> | |
17 | ||
18 | #include "scsi.h" | |
19 | #include <scsi/scsi_host.h> | |
20 | #include "wd33c93.h" | |
21 | #include "a2091.h" | |
22 | ||
23 | #include<linux/stat.h> | |
24 | ||
25 | #define DMA(ptr) ((a2091_scsiregs *)((ptr)->base)) | |
26 | #define HDATA(ptr) ((struct WD33C93_hostdata *)((ptr)->hostdata)) | |
27 | ||
28 | static irqreturn_t a2091_intr (int irq, void *_instance, struct pt_regs *fp) | |
29 | { | |
30 | unsigned long flags; | |
31 | unsigned int status; | |
32 | struct Scsi_Host *instance = (struct Scsi_Host *)_instance; | |
33 | ||
34 | status = DMA(instance)->ISTR; | |
35 | if (!(status & (ISTR_INT_F|ISTR_INT_P)) || !(status & ISTR_INTS)) | |
36 | return IRQ_NONE; | |
37 | ||
38 | spin_lock_irqsave(instance->host_lock, flags); | |
39 | wd33c93_intr(instance); | |
40 | spin_unlock_irqrestore(instance->host_lock, flags); | |
41 | return IRQ_HANDLED; | |
42 | } | |
43 | ||
44 | static int dma_setup (Scsi_Cmnd *cmd, int dir_in) | |
45 | { | |
46 | unsigned short cntr = CNTR_PDMD | CNTR_INTEN; | |
47 | unsigned long addr = virt_to_bus(cmd->SCp.ptr); | |
48 | struct Scsi_Host *instance = cmd->device->host; | |
49 | ||
50 | /* don't allow DMA if the physical address is bad */ | |
51 | if (addr & A2091_XFER_MASK || | |
52 | (!dir_in && mm_end_of_chunk (addr, cmd->SCp.this_residual))) | |
53 | { | |
54 | HDATA(instance)->dma_bounce_len = (cmd->SCp.this_residual + 511) | |
55 | & ~0x1ff; | |
56 | HDATA(instance)->dma_bounce_buffer = | |
57 | kmalloc (HDATA(instance)->dma_bounce_len, GFP_KERNEL); | |
58 | ||
59 | /* can't allocate memory; use PIO */ | |
60 | if (!HDATA(instance)->dma_bounce_buffer) { | |
61 | HDATA(instance)->dma_bounce_len = 0; | |
62 | return 1; | |
63 | } | |
64 | ||
65 | /* get the physical address of the bounce buffer */ | |
66 | addr = virt_to_bus(HDATA(instance)->dma_bounce_buffer); | |
67 | ||
68 | /* the bounce buffer may not be in the first 16M of physmem */ | |
69 | if (addr & A2091_XFER_MASK) { | |
70 | /* we could use chipmem... maybe later */ | |
71 | kfree (HDATA(instance)->dma_bounce_buffer); | |
72 | HDATA(instance)->dma_bounce_buffer = NULL; | |
73 | HDATA(instance)->dma_bounce_len = 0; | |
74 | return 1; | |
75 | } | |
76 | ||
77 | if (!dir_in) { | |
78 | /* copy to bounce buffer for a write */ | |
79 | if (cmd->use_sg) | |
80 | #if 0 | |
81 | panic ("scsi%ddma: incomplete s/g support", | |
82 | instance->host_no); | |
83 | #else | |
84 | memcpy (HDATA(instance)->dma_bounce_buffer, | |
85 | cmd->SCp.ptr, cmd->SCp.this_residual); | |
86 | #endif | |
87 | else | |
88 | memcpy (HDATA(instance)->dma_bounce_buffer, | |
89 | cmd->request_buffer, cmd->request_bufflen); | |
90 | } | |
91 | } | |
92 | ||
93 | /* setup dma direction */ | |
94 | if (!dir_in) | |
95 | cntr |= CNTR_DDIR; | |
96 | ||
97 | /* remember direction */ | |
98 | HDATA(cmd->device->host)->dma_dir = dir_in; | |
99 | ||
100 | DMA(cmd->device->host)->CNTR = cntr; | |
101 | ||
102 | /* setup DMA *physical* address */ | |
103 | DMA(cmd->device->host)->ACR = addr; | |
104 | ||
105 | if (dir_in){ | |
106 | /* invalidate any cache */ | |
107 | cache_clear (addr, cmd->SCp.this_residual); | |
108 | }else{ | |
109 | /* push any dirty cache */ | |
110 | cache_push (addr, cmd->SCp.this_residual); | |
111 | } | |
112 | /* start DMA */ | |
113 | DMA(cmd->device->host)->ST_DMA = 1; | |
114 | ||
115 | /* return success */ | |
116 | return 0; | |
117 | } | |
118 | ||
119 | static void dma_stop (struct Scsi_Host *instance, Scsi_Cmnd *SCpnt, | |
120 | int status) | |
121 | { | |
122 | /* disable SCSI interrupts */ | |
123 | unsigned short cntr = CNTR_PDMD; | |
124 | ||
125 | if (!HDATA(instance)->dma_dir) | |
126 | cntr |= CNTR_DDIR; | |
127 | ||
128 | /* disable SCSI interrupts */ | |
129 | DMA(instance)->CNTR = cntr; | |
130 | ||
131 | /* flush if we were reading */ | |
132 | if (HDATA(instance)->dma_dir) { | |
133 | DMA(instance)->FLUSH = 1; | |
134 | while (!(DMA(instance)->ISTR & ISTR_FE_FLG)) | |
135 | ; | |
136 | } | |
137 | ||
138 | /* clear a possible interrupt */ | |
139 | DMA(instance)->CINT = 1; | |
140 | ||
141 | /* stop DMA */ | |
142 | DMA(instance)->SP_DMA = 1; | |
143 | ||
144 | /* restore the CONTROL bits (minus the direction flag) */ | |
145 | DMA(instance)->CNTR = CNTR_PDMD | CNTR_INTEN; | |
146 | ||
147 | /* copy from a bounce buffer, if necessary */ | |
148 | if (status && HDATA(instance)->dma_bounce_buffer) { | |
149 | if (SCpnt && SCpnt->use_sg) { | |
150 | #if 0 | |
151 | panic ("scsi%d: incomplete s/g support", | |
152 | instance->host_no); | |
153 | #else | |
154 | if( HDATA(instance)->dma_dir ) | |
155 | memcpy (SCpnt->SCp.ptr, | |
156 | HDATA(instance)->dma_bounce_buffer, | |
157 | SCpnt->SCp.this_residual); | |
158 | kfree (HDATA(instance)->dma_bounce_buffer); | |
159 | HDATA(instance)->dma_bounce_buffer = NULL; | |
160 | HDATA(instance)->dma_bounce_len = 0; | |
161 | ||
162 | #endif | |
163 | } else { | |
164 | if (HDATA(instance)->dma_dir && SCpnt) | |
165 | memcpy (SCpnt->request_buffer, | |
166 | HDATA(instance)->dma_bounce_buffer, | |
167 | SCpnt->request_bufflen); | |
168 | ||
169 | kfree (HDATA(instance)->dma_bounce_buffer); | |
170 | HDATA(instance)->dma_bounce_buffer = NULL; | |
171 | HDATA(instance)->dma_bounce_len = 0; | |
172 | } | |
173 | } | |
174 | } | |
175 | ||
176 | int __init a2091_detect(Scsi_Host_Template *tpnt) | |
177 | { | |
178 | static unsigned char called = 0; | |
179 | struct Scsi_Host *instance; | |
180 | unsigned long address; | |
181 | struct zorro_dev *z = NULL; | |
182 | wd33c93_regs regs; | |
183 | int num_a2091 = 0; | |
184 | ||
185 | if (!MACH_IS_AMIGA || called) | |
186 | return 0; | |
187 | called = 1; | |
188 | ||
189 | tpnt->proc_name = "A2091"; | |
190 | tpnt->proc_info = &wd33c93_proc_info; | |
191 | ||
192 | while ((z = zorro_find_device(ZORRO_WILDCARD, z))) { | |
193 | if (z->id != ZORRO_PROD_CBM_A590_A2091_1 && | |
194 | z->id != ZORRO_PROD_CBM_A590_A2091_2) | |
195 | continue; | |
196 | address = z->resource.start; | |
197 | if (!request_mem_region(address, 256, "wd33c93")) | |
198 | continue; | |
199 | ||
200 | instance = scsi_register (tpnt, sizeof (struct WD33C93_hostdata)); | |
201 | if (instance == NULL) { | |
202 | release_mem_region(address, 256); | |
203 | continue; | |
204 | } | |
205 | instance->base = ZTWO_VADDR(address); | |
206 | instance->irq = IRQ_AMIGA_PORTS; | |
207 | instance->unique_id = z->slotaddr; | |
208 | DMA(instance)->DAWR = DAWR_A2091; | |
209 | regs.SASR = &(DMA(instance)->SASR); | |
210 | regs.SCMD = &(DMA(instance)->SCMD); | |
211 | wd33c93_init(instance, regs, dma_setup, dma_stop, WD33C93_FS_8_10); | |
212 | request_irq(IRQ_AMIGA_PORTS, a2091_intr, SA_SHIRQ, "A2091 SCSI", | |
213 | instance); | |
214 | DMA(instance)->CNTR = CNTR_PDMD | CNTR_INTEN; | |
215 | num_a2091++; | |
216 | } | |
217 | ||
218 | return num_a2091; | |
219 | } | |
220 | ||
221 | static int a2091_bus_reset(Scsi_Cmnd *cmd) | |
222 | { | |
223 | /* FIXME perform bus-specific reset */ | |
224 | wd33c93_host_reset(cmd); | |
225 | return SUCCESS; | |
226 | } | |
227 | ||
228 | #define HOSTS_C | |
229 | ||
230 | static Scsi_Host_Template driver_template = { | |
231 | .proc_name = "A2901", | |
232 | .name = "Commodore A2091/A590 SCSI", | |
233 | .detect = a2091_detect, | |
234 | .release = a2091_release, | |
235 | .queuecommand = wd33c93_queuecommand, | |
236 | .eh_abort_handler = wd33c93_abort, | |
237 | .eh_bus_reset_handler = a2091_bus_reset, | |
238 | .eh_host_reset_handler = wd33c93_host_reset, | |
239 | .can_queue = CAN_QUEUE, | |
240 | .this_id = 7, | |
241 | .sg_tablesize = SG_ALL, | |
242 | .cmd_per_lun = CMD_PER_LUN, | |
243 | .use_clustering = DISABLE_CLUSTERING | |
244 | }; | |
245 | ||
246 | ||
247 | #include "scsi_module.c" | |
248 | ||
249 | int a2091_release(struct Scsi_Host *instance) | |
250 | { | |
251 | #ifdef MODULE | |
252 | DMA(instance)->CNTR = 0; | |
253 | release_mem_region(ZTWO_PADDR(instance->base), 256); | |
254 | free_irq(IRQ_AMIGA_PORTS, instance); | |
255 | wd33c93_release(); | |
256 | #endif | |
257 | return 1; | |
258 | } | |
259 | ||
260 | MODULE_LICENSE("GPL"); |