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1da177e4 LT |
1 | #include <linux/types.h> |
2 | #include <linux/mm.h> | |
3 | #include <linux/blkdev.h> | |
1da177e4 LT |
4 | #include <linux/ioport.h> |
5 | #include <linux/init.h> | |
6 | #include <linux/spinlock.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 <asm/irq.h> | |
15 | ||
16 | #include "scsi.h" | |
17 | #include <scsi/scsi_host.h> | |
18 | #include "wd33c93.h" | |
19 | #include "a3000.h" | |
20 | ||
21 | #include<linux/stat.h> | |
22 | ||
23 | #define DMA(ptr) ((a3000_scsiregs *)((ptr)->base)) | |
24 | #define HDATA(ptr) ((struct WD33C93_hostdata *)((ptr)->hostdata)) | |
25 | ||
26 | static struct Scsi_Host *a3000_host = NULL; | |
27 | ||
9387edbe AB |
28 | static int a3000_release(struct Scsi_Host *instance); |
29 | ||
7d12e780 | 30 | static irqreturn_t a3000_intr (int irq, void *dummy) |
1da177e4 LT |
31 | { |
32 | unsigned long flags; | |
33 | unsigned int status = DMA(a3000_host)->ISTR; | |
34 | ||
35 | if (!(status & ISTR_INT_P)) | |
36 | return IRQ_NONE; | |
37 | if (status & ISTR_INTS) | |
38 | { | |
39 | spin_lock_irqsave(a3000_host->host_lock, flags); | |
40 | wd33c93_intr (a3000_host); | |
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 LT |
49 | { |
50 | unsigned short cntr = CNTR_PDMD | CNTR_INTEN; | |
51 | unsigned long addr = virt_to_bus(cmd->SCp.ptr); | |
52 | ||
53 | /* | |
54 | * if the physical address has the wrong alignment, or if | |
55 | * physical address is bad, or if it is a write and at the | |
56 | * end of a physical memory chunk, then allocate a bounce | |
57 | * buffer | |
58 | */ | |
7b892806 | 59 | if (addr & A3000_XFER_MASK) |
1da177e4 LT |
60 | { |
61 | HDATA(a3000_host)->dma_bounce_len = (cmd->SCp.this_residual + 511) | |
62 | & ~0x1ff; | |
63 | HDATA(a3000_host)->dma_bounce_buffer = | |
64 | kmalloc (HDATA(a3000_host)->dma_bounce_len, GFP_KERNEL); | |
65 | ||
66 | /* can't allocate memory; use PIO */ | |
67 | if (!HDATA(a3000_host)->dma_bounce_buffer) { | |
68 | HDATA(a3000_host)->dma_bounce_len = 0; | |
69 | return 1; | |
70 | } | |
71 | ||
72 | if (!dir_in) { | |
73 | /* copy to bounce buffer for a write */ | |
cc0455fa BH |
74 | memcpy (HDATA(a3000_host)->dma_bounce_buffer, |
75 | cmd->SCp.ptr, cmd->SCp.this_residual); | |
1da177e4 LT |
76 | } |
77 | ||
78 | addr = virt_to_bus(HDATA(a3000_host)->dma_bounce_buffer); | |
79 | } | |
80 | ||
81 | /* setup dma direction */ | |
82 | if (!dir_in) | |
83 | cntr |= CNTR_DDIR; | |
84 | ||
85 | /* remember direction */ | |
86 | HDATA(a3000_host)->dma_dir = dir_in; | |
87 | ||
88 | DMA(a3000_host)->CNTR = cntr; | |
89 | ||
90 | /* setup DMA *physical* address */ | |
91 | DMA(a3000_host)->ACR = addr; | |
92 | ||
93 | if (dir_in) | |
94 | /* invalidate any cache */ | |
95 | cache_clear (addr, cmd->SCp.this_residual); | |
96 | else | |
97 | /* push any dirty cache */ | |
98 | cache_push (addr, cmd->SCp.this_residual); | |
99 | ||
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 */ | |
104 | ||
105 | /* return success */ | |
106 | return 0; | |
107 | } | |
108 | ||
65396410 HK |
109 | static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt, |
110 | int status) | |
1da177e4 LT |
111 | { |
112 | /* disable SCSI interrupts */ | |
113 | unsigned short cntr = CNTR_PDMD; | |
114 | ||
115 | if (!HDATA(instance)->dma_dir) | |
116 | cntr |= CNTR_DDIR; | |
117 | ||
118 | DMA(instance)->CNTR = cntr; | |
119 | mb(); /* make sure CNTR is updated before next IO */ | |
120 | ||
121 | /* flush if we were reading */ | |
122 | if (HDATA(instance)->dma_dir) { | |
123 | DMA(instance)->FLUSH = 1; | |
124 | mb(); /* don't allow prefetch */ | |
125 | while (!(DMA(instance)->ISTR & ISTR_FE_FLG)) | |
126 | barrier(); | |
127 | mb(); /* no IO until FLUSH is done */ | |
128 | } | |
129 | ||
130 | /* clear a possible interrupt */ | |
131 | /* I think that this CINT is only necessary if you are | |
132 | * using the terminal count features. HM 7 Mar 1994 | |
133 | */ | |
134 | DMA(instance)->CINT = 1; | |
135 | ||
136 | /* stop DMA */ | |
137 | DMA(instance)->SP_DMA = 1; | |
138 | mb(); /* make sure DMA is stopped before next IO */ | |
139 | ||
140 | /* restore the CONTROL bits (minus the direction flag) */ | |
141 | DMA(instance)->CNTR = CNTR_PDMD | CNTR_INTEN; | |
142 | mb(); /* make sure CNTR is updated before next IO */ | |
143 | ||
144 | /* copy from a bounce buffer, if necessary */ | |
145 | if (status && HDATA(instance)->dma_bounce_buffer) { | |
cc0455fa | 146 | if (SCpnt) { |
1da177e4 LT |
147 | if (HDATA(instance)->dma_dir && SCpnt) |
148 | memcpy (SCpnt->SCp.ptr, | |
149 | HDATA(instance)->dma_bounce_buffer, | |
150 | SCpnt->SCp.this_residual); | |
151 | kfree (HDATA(instance)->dma_bounce_buffer); | |
152 | HDATA(instance)->dma_bounce_buffer = NULL; | |
153 | HDATA(instance)->dma_bounce_len = 0; | |
154 | } else { | |
1da177e4 LT |
155 | kfree (HDATA(instance)->dma_bounce_buffer); |
156 | HDATA(instance)->dma_bounce_buffer = NULL; | |
157 | HDATA(instance)->dma_bounce_len = 0; | |
158 | } | |
159 | } | |
160 | } | |
161 | ||
9387edbe | 162 | static int __init a3000_detect(struct scsi_host_template *tpnt) |
1da177e4 LT |
163 | { |
164 | wd33c93_regs regs; | |
165 | ||
166 | if (!MACH_IS_AMIGA || !AMIGAHW_PRESENT(A3000_SCSI)) | |
167 | return 0; | |
168 | if (!request_mem_region(0xDD0000, 256, "wd33c93")) | |
169 | return 0; | |
170 | ||
171 | tpnt->proc_name = "A3000"; | |
172 | tpnt->proc_info = &wd33c93_proc_info; | |
173 | ||
174 | a3000_host = scsi_register (tpnt, sizeof(struct WD33C93_hostdata)); | |
175 | if (a3000_host == NULL) | |
176 | goto fail_register; | |
177 | ||
178 | a3000_host->base = ZTWO_VADDR(0xDD0000); | |
179 | a3000_host->irq = IRQ_AMIGA_PORTS; | |
180 | DMA(a3000_host)->DAWR = DAWR_A3000; | |
181 | regs.SASR = &(DMA(a3000_host)->SASR); | |
182 | regs.SCMD = &(DMA(a3000_host)->SCMD); | |
be3cb3d8 TB |
183 | HDATA(a3000_host)->no_sync = 0xff; |
184 | HDATA(a3000_host)->fast = 0; | |
185 | HDATA(a3000_host)->dma_mode = CTRL_DMA; | |
1da177e4 | 186 | wd33c93_init(a3000_host, regs, dma_setup, dma_stop, WD33C93_FS_12_15); |
1d6f359a | 187 | if (request_irq(IRQ_AMIGA_PORTS, a3000_intr, IRQF_SHARED, "A3000 SCSI", |
1da177e4 LT |
188 | a3000_intr)) |
189 | goto fail_irq; | |
190 | DMA(a3000_host)->CNTR = CNTR_PDMD | CNTR_INTEN; | |
191 | ||
192 | return 1; | |
193 | ||
194 | fail_irq: | |
195 | wd33c93_release(); | |
196 | scsi_unregister(a3000_host); | |
197 | fail_register: | |
198 | release_mem_region(0xDD0000, 256); | |
199 | return 0; | |
200 | } | |
201 | ||
65396410 | 202 | static int a3000_bus_reset(struct scsi_cmnd *cmd) |
1da177e4 LT |
203 | { |
204 | /* FIXME perform bus-specific reset */ | |
df0ae249 JG |
205 | |
206 | /* FIXME 2: kill this entire function, which should | |
207 | cause mid-layer to call wd33c93_host_reset anyway? */ | |
68b3aa7c JG |
208 | |
209 | spin_lock_irq(cmd->device->host->host_lock); | |
1da177e4 | 210 | wd33c93_host_reset(cmd); |
68b3aa7c JG |
211 | spin_unlock_irq(cmd->device->host->host_lock); |
212 | ||
1da177e4 LT |
213 | return SUCCESS; |
214 | } | |
215 | ||
216 | #define HOSTS_C | |
217 | ||
d0be4a7d | 218 | static struct scsi_host_template driver_template = { |
1da177e4 LT |
219 | .proc_name = "A3000", |
220 | .name = "Amiga 3000 built-in SCSI", | |
221 | .detect = a3000_detect, | |
222 | .release = a3000_release, | |
223 | .queuecommand = wd33c93_queuecommand, | |
224 | .eh_abort_handler = wd33c93_abort, | |
225 | .eh_bus_reset_handler = a3000_bus_reset, | |
226 | .eh_host_reset_handler = wd33c93_host_reset, | |
227 | .can_queue = CAN_QUEUE, | |
228 | .this_id = 7, | |
229 | .sg_tablesize = SG_ALL, | |
230 | .cmd_per_lun = CMD_PER_LUN, | |
231 | .use_clustering = ENABLE_CLUSTERING | |
232 | }; | |
233 | ||
234 | ||
235 | #include "scsi_module.c" | |
236 | ||
9387edbe | 237 | static int a3000_release(struct Scsi_Host *instance) |
1da177e4 LT |
238 | { |
239 | wd33c93_release(); | |
240 | DMA(instance)->CNTR = 0; | |
241 | release_mem_region(0xDD0000, 256); | |
242 | free_irq(IRQ_AMIGA_PORTS, a3000_intr); | |
243 | return 1; | |
244 | } | |
245 | ||
246 | MODULE_LICENSE("GPL"); |