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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 | ||
7d12e780 | 28 | static irqreturn_t a3000_intr (int irq, void *dummy) |
1da177e4 LT |
29 | { |
30 | unsigned long flags; | |
31 | unsigned int status = DMA(a3000_host)->ISTR; | |
32 | ||
33 | if (!(status & ISTR_INT_P)) | |
34 | return IRQ_NONE; | |
35 | if (status & ISTR_INTS) | |
36 | { | |
37 | spin_lock_irqsave(a3000_host->host_lock, flags); | |
38 | wd33c93_intr (a3000_host); | |
39 | spin_unlock_irqrestore(a3000_host->host_lock, flags); | |
40 | return IRQ_HANDLED; | |
41 | } | |
42 | printk("Non-serviced A3000 SCSI-interrupt? ISTR = %02x\n", status); | |
43 | return IRQ_NONE; | |
44 | } | |
45 | ||
65396410 | 46 | static int dma_setup(struct scsi_cmnd *cmd, int dir_in) |
1da177e4 LT |
47 | { |
48 | unsigned short cntr = CNTR_PDMD | CNTR_INTEN; | |
49 | unsigned long addr = virt_to_bus(cmd->SCp.ptr); | |
50 | ||
51 | /* | |
52 | * if the physical address has the wrong alignment, or if | |
53 | * physical address is bad, or if it is a write and at the | |
54 | * end of a physical memory chunk, then allocate a bounce | |
55 | * buffer | |
56 | */ | |
57 | if (addr & A3000_XFER_MASK || | |
58 | (!dir_in && mm_end_of_chunk (addr, cmd->SCp.this_residual))) | |
59 | { | |
60 | HDATA(a3000_host)->dma_bounce_len = (cmd->SCp.this_residual + 511) | |
61 | & ~0x1ff; | |
62 | HDATA(a3000_host)->dma_bounce_buffer = | |
63 | kmalloc (HDATA(a3000_host)->dma_bounce_len, GFP_KERNEL); | |
64 | ||
65 | /* can't allocate memory; use PIO */ | |
66 | if (!HDATA(a3000_host)->dma_bounce_buffer) { | |
67 | HDATA(a3000_host)->dma_bounce_len = 0; | |
68 | return 1; | |
69 | } | |
70 | ||
71 | if (!dir_in) { | |
72 | /* copy to bounce buffer for a write */ | |
cc0455fa BH |
73 | memcpy (HDATA(a3000_host)->dma_bounce_buffer, |
74 | cmd->SCp.ptr, cmd->SCp.this_residual); | |
1da177e4 LT |
75 | } |
76 | ||
77 | addr = virt_to_bus(HDATA(a3000_host)->dma_bounce_buffer); | |
78 | } | |
79 | ||
80 | /* setup dma direction */ | |
81 | if (!dir_in) | |
82 | cntr |= CNTR_DDIR; | |
83 | ||
84 | /* remember direction */ | |
85 | HDATA(a3000_host)->dma_dir = dir_in; | |
86 | ||
87 | DMA(a3000_host)->CNTR = cntr; | |
88 | ||
89 | /* setup DMA *physical* address */ | |
90 | DMA(a3000_host)->ACR = addr; | |
91 | ||
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 | ||
99 | /* start DMA */ | |
100 | mb(); /* make sure setup is completed */ | |
101 | DMA(a3000_host)->ST_DMA = 1; | |
102 | mb(); /* make sure DMA has started before next IO */ | |
103 | ||
104 | /* return success */ | |
105 | return 0; | |
106 | } | |
107 | ||
65396410 HK |
108 | static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt, |
109 | int status) | |
1da177e4 LT |
110 | { |
111 | /* disable SCSI interrupts */ | |
112 | unsigned short cntr = CNTR_PDMD; | |
113 | ||
114 | if (!HDATA(instance)->dma_dir) | |
115 | cntr |= CNTR_DDIR; | |
116 | ||
117 | DMA(instance)->CNTR = cntr; | |
118 | mb(); /* make sure CNTR is updated before next IO */ | |
119 | ||
120 | /* flush if we were reading */ | |
121 | if (HDATA(instance)->dma_dir) { | |
122 | DMA(instance)->FLUSH = 1; | |
123 | mb(); /* don't allow prefetch */ | |
124 | while (!(DMA(instance)->ISTR & ISTR_FE_FLG)) | |
125 | barrier(); | |
126 | mb(); /* no IO until FLUSH is done */ | |
127 | } | |
128 | ||
129 | /* clear a possible interrupt */ | |
130 | /* I think that this CINT is only necessary if you are | |
131 | * using the terminal count features. HM 7 Mar 1994 | |
132 | */ | |
133 | DMA(instance)->CINT = 1; | |
134 | ||
135 | /* stop DMA */ | |
136 | DMA(instance)->SP_DMA = 1; | |
137 | mb(); /* make sure DMA is stopped before next IO */ | |
138 | ||
139 | /* restore the CONTROL bits (minus the direction flag) */ | |
140 | DMA(instance)->CNTR = CNTR_PDMD | CNTR_INTEN; | |
141 | mb(); /* make sure CNTR is updated before next IO */ | |
142 | ||
143 | /* copy from a bounce buffer, if necessary */ | |
144 | if (status && HDATA(instance)->dma_bounce_buffer) { | |
cc0455fa | 145 | if (SCpnt) { |
1da177e4 LT |
146 | if (HDATA(instance)->dma_dir && SCpnt) |
147 | memcpy (SCpnt->SCp.ptr, | |
148 | HDATA(instance)->dma_bounce_buffer, | |
149 | SCpnt->SCp.this_residual); | |
150 | kfree (HDATA(instance)->dma_bounce_buffer); | |
151 | HDATA(instance)->dma_bounce_buffer = NULL; | |
152 | HDATA(instance)->dma_bounce_len = 0; | |
153 | } else { | |
1da177e4 LT |
154 | kfree (HDATA(instance)->dma_bounce_buffer); |
155 | HDATA(instance)->dma_bounce_buffer = NULL; | |
156 | HDATA(instance)->dma_bounce_len = 0; | |
157 | } | |
158 | } | |
159 | } | |
160 | ||
d0be4a7d | 161 | int __init a3000_detect(struct scsi_host_template *tpnt) |
1da177e4 LT |
162 | { |
163 | wd33c93_regs regs; | |
164 | ||
165 | if (!MACH_IS_AMIGA || !AMIGAHW_PRESENT(A3000_SCSI)) | |
166 | return 0; | |
167 | if (!request_mem_region(0xDD0000, 256, "wd33c93")) | |
168 | return 0; | |
169 | ||
170 | tpnt->proc_name = "A3000"; | |
171 | tpnt->proc_info = &wd33c93_proc_info; | |
172 | ||
173 | a3000_host = scsi_register (tpnt, sizeof(struct WD33C93_hostdata)); | |
174 | if (a3000_host == NULL) | |
175 | goto fail_register; | |
176 | ||
177 | a3000_host->base = ZTWO_VADDR(0xDD0000); | |
178 | a3000_host->irq = IRQ_AMIGA_PORTS; | |
179 | DMA(a3000_host)->DAWR = DAWR_A3000; | |
180 | regs.SASR = &(DMA(a3000_host)->SASR); | |
181 | regs.SCMD = &(DMA(a3000_host)->SCMD); | |
182 | wd33c93_init(a3000_host, regs, dma_setup, dma_stop, WD33C93_FS_12_15); | |
1d6f359a | 183 | if (request_irq(IRQ_AMIGA_PORTS, a3000_intr, IRQF_SHARED, "A3000 SCSI", |
1da177e4 LT |
184 | a3000_intr)) |
185 | goto fail_irq; | |
186 | DMA(a3000_host)->CNTR = CNTR_PDMD | CNTR_INTEN; | |
187 | ||
188 | return 1; | |
189 | ||
190 | fail_irq: | |
191 | wd33c93_release(); | |
192 | scsi_unregister(a3000_host); | |
193 | fail_register: | |
194 | release_mem_region(0xDD0000, 256); | |
195 | return 0; | |
196 | } | |
197 | ||
65396410 | 198 | static int a3000_bus_reset(struct scsi_cmnd *cmd) |
1da177e4 LT |
199 | { |
200 | /* FIXME perform bus-specific reset */ | |
df0ae249 JG |
201 | |
202 | /* FIXME 2: kill this entire function, which should | |
203 | cause mid-layer to call wd33c93_host_reset anyway? */ | |
68b3aa7c JG |
204 | |
205 | spin_lock_irq(cmd->device->host->host_lock); | |
1da177e4 | 206 | wd33c93_host_reset(cmd); |
68b3aa7c JG |
207 | spin_unlock_irq(cmd->device->host->host_lock); |
208 | ||
1da177e4 LT |
209 | return SUCCESS; |
210 | } | |
211 | ||
212 | #define HOSTS_C | |
213 | ||
d0be4a7d | 214 | static struct scsi_host_template driver_template = { |
1da177e4 LT |
215 | .proc_name = "A3000", |
216 | .name = "Amiga 3000 built-in SCSI", | |
217 | .detect = a3000_detect, | |
218 | .release = a3000_release, | |
219 | .queuecommand = wd33c93_queuecommand, | |
220 | .eh_abort_handler = wd33c93_abort, | |
221 | .eh_bus_reset_handler = a3000_bus_reset, | |
222 | .eh_host_reset_handler = wd33c93_host_reset, | |
223 | .can_queue = CAN_QUEUE, | |
224 | .this_id = 7, | |
225 | .sg_tablesize = SG_ALL, | |
226 | .cmd_per_lun = CMD_PER_LUN, | |
227 | .use_clustering = ENABLE_CLUSTERING | |
228 | }; | |
229 | ||
230 | ||
231 | #include "scsi_module.c" | |
232 | ||
233 | int a3000_release(struct Scsi_Host *instance) | |
234 | { | |
235 | wd33c93_release(); | |
236 | DMA(instance)->CNTR = 0; | |
237 | release_mem_region(0xDD0000, 256); | |
238 | free_irq(IRQ_AMIGA_PORTS, a3000_intr); | |
239 | return 1; | |
240 | } | |
241 | ||
242 | MODULE_LICENSE("GPL"); |