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09c434b8 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 | 2 | #include <linux/types.h> |
1da177e4 LT |
3 | #include <linux/init.h> |
4 | #include <linux/interrupt.h> | |
c737e22c GU |
5 | #include <linux/mm.h> |
6 | #include <linux/slab.h> | |
7 | #include <linux/spinlock.h> | |
8 | #include <linux/zorro.h> | |
acf3368f | 9 | #include <linux/module.h> |
1da177e4 | 10 | |
1da177e4 LT |
11 | #include <asm/page.h> |
12 | #include <asm/pgtable.h> | |
13 | #include <asm/amigaints.h> | |
14 | #include <asm/amigahw.h> | |
1da177e4 LT |
15 | |
16 | #include "scsi.h" | |
1da177e4 LT |
17 | #include "wd33c93.h" |
18 | #include "a2091.h" | |
19 | ||
5880f486 | 20 | |
65c2784a GU |
21 | struct a2091_hostdata { |
22 | struct WD33C93_hostdata wh; | |
23 | struct a2091_scsiregs *regs; | |
24 | }; | |
25 | ||
b1de6ab7 | 26 | static irqreturn_t a2091_intr(int irq, void *data) |
1da177e4 | 27 | { |
b1de6ab7 | 28 | struct Scsi_Host *instance = data; |
65c2784a GU |
29 | struct a2091_hostdata *hdata = shost_priv(instance); |
30 | unsigned int status = hdata->regs->ISTR; | |
09bc85b0 | 31 | unsigned long flags; |
09bc85b0 | 32 | |
09bc85b0 GU |
33 | if (!(status & (ISTR_INT_F | ISTR_INT_P)) || !(status & ISTR_INTS)) |
34 | return IRQ_NONE; | |
35 | ||
36 | spin_lock_irqsave(instance->host_lock, flags); | |
37 | wd33c93_intr(instance); | |
38 | spin_unlock_irqrestore(instance->host_lock, flags); | |
39 | return IRQ_HANDLED; | |
1da177e4 LT |
40 | } |
41 | ||
65396410 | 42 | static int dma_setup(struct scsi_cmnd *cmd, int dir_in) |
1da177e4 | 43 | { |
6d1d5d43 | 44 | struct Scsi_Host *instance = cmd->device->host; |
65c2784a GU |
45 | struct a2091_hostdata *hdata = shost_priv(instance); |
46 | struct WD33C93_hostdata *wh = &hdata->wh; | |
47 | struct a2091_scsiregs *regs = hdata->regs; | |
09bc85b0 GU |
48 | unsigned short cntr = CNTR_PDMD | CNTR_INTEN; |
49 | unsigned long addr = virt_to_bus(cmd->SCp.ptr); | |
1da177e4 | 50 | |
09bc85b0 | 51 | /* don't allow DMA if the physical address is bad */ |
1da177e4 | 52 | if (addr & A2091_XFER_MASK) { |
65c2784a GU |
53 | wh->dma_bounce_len = (cmd->SCp.this_residual + 511) & ~0x1ff; |
54 | wh->dma_bounce_buffer = kmalloc(wh->dma_bounce_len, | |
55 | GFP_KERNEL); | |
09bc85b0 GU |
56 | |
57 | /* can't allocate memory; use PIO */ | |
65c2784a GU |
58 | if (!wh->dma_bounce_buffer) { |
59 | wh->dma_bounce_len = 0; | |
09bc85b0 GU |
60 | return 1; |
61 | } | |
62 | ||
63 | /* get the physical address of the bounce buffer */ | |
65c2784a | 64 | addr = virt_to_bus(wh->dma_bounce_buffer); |
09bc85b0 GU |
65 | |
66 | /* the bounce buffer may not be in the first 16M of physmem */ | |
67 | if (addr & A2091_XFER_MASK) { | |
68 | /* we could use chipmem... maybe later */ | |
65c2784a GU |
69 | kfree(wh->dma_bounce_buffer); |
70 | wh->dma_bounce_buffer = NULL; | |
71 | wh->dma_bounce_len = 0; | |
09bc85b0 GU |
72 | return 1; |
73 | } | |
74 | ||
75 | if (!dir_in) { | |
76 | /* copy to bounce buffer for a write */ | |
65c2784a | 77 | memcpy(wh->dma_bounce_buffer, cmd->SCp.ptr, |
6d1d5d43 | 78 | cmd->SCp.this_residual); |
09bc85b0 | 79 | } |
1da177e4 | 80 | } |
1da177e4 | 81 | |
09bc85b0 GU |
82 | /* setup dma direction */ |
83 | if (!dir_in) | |
84 | cntr |= CNTR_DDIR; | |
1da177e4 | 85 | |
09bc85b0 | 86 | /* remember direction */ |
65c2784a | 87 | wh->dma_dir = dir_in; |
1da177e4 | 88 | |
b1de6ab7 | 89 | regs->CNTR = cntr; |
1da177e4 | 90 | |
09bc85b0 | 91 | /* setup DMA *physical* address */ |
b1de6ab7 | 92 | regs->ACR = addr; |
1da177e4 | 93 | |
09bc85b0 GU |
94 | if (dir_in) { |
95 | /* invalidate any cache */ | |
96 | cache_clear(addr, cmd->SCp.this_residual); | |
97 | } else { | |
98 | /* push any dirty cache */ | |
99 | cache_push(addr, cmd->SCp.this_residual); | |
100 | } | |
101 | /* start DMA */ | |
b1de6ab7 | 102 | regs->ST_DMA = 1; |
1da177e4 | 103 | |
09bc85b0 GU |
104 | /* return success */ |
105 | return 0; | |
1da177e4 LT |
106 | } |
107 | ||
65396410 | 108 | static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt, |
09bc85b0 | 109 | int status) |
1da177e4 | 110 | { |
65c2784a GU |
111 | struct a2091_hostdata *hdata = shost_priv(instance); |
112 | struct WD33C93_hostdata *wh = &hdata->wh; | |
113 | struct a2091_scsiregs *regs = hdata->regs; | |
6d1d5d43 | 114 | |
09bc85b0 GU |
115 | /* disable SCSI interrupts */ |
116 | unsigned short cntr = CNTR_PDMD; | |
117 | ||
65c2784a | 118 | if (!wh->dma_dir) |
09bc85b0 GU |
119 | cntr |= CNTR_DDIR; |
120 | ||
121 | /* disable SCSI interrupts */ | |
b1de6ab7 | 122 | regs->CNTR = cntr; |
09bc85b0 GU |
123 | |
124 | /* flush if we were reading */ | |
65c2784a | 125 | if (wh->dma_dir) { |
b1de6ab7 GU |
126 | regs->FLUSH = 1; |
127 | while (!(regs->ISTR & ISTR_FE_FLG)) | |
09bc85b0 GU |
128 | ; |
129 | } | |
130 | ||
131 | /* clear a possible interrupt */ | |
b1de6ab7 | 132 | regs->CINT = 1; |
09bc85b0 GU |
133 | |
134 | /* stop DMA */ | |
b1de6ab7 | 135 | regs->SP_DMA = 1; |
09bc85b0 GU |
136 | |
137 | /* restore the CONTROL bits (minus the direction flag) */ | |
b1de6ab7 | 138 | regs->CNTR = CNTR_PDMD | CNTR_INTEN; |
09bc85b0 GU |
139 | |
140 | /* copy from a bounce buffer, if necessary */ | |
65c2784a GU |
141 | if (status && wh->dma_bounce_buffer) { |
142 | if (wh->dma_dir) | |
143 | memcpy(SCpnt->SCp.ptr, wh->dma_bounce_buffer, | |
09bc85b0 | 144 | SCpnt->SCp.this_residual); |
65c2784a GU |
145 | kfree(wh->dma_bounce_buffer); |
146 | wh->dma_bounce_buffer = NULL; | |
147 | wh->dma_bounce_len = 0; | |
09bc85b0 | 148 | } |
1da177e4 LT |
149 | } |
150 | ||
c737e22c GU |
151 | static struct scsi_host_template a2091_scsi_template = { |
152 | .module = THIS_MODULE, | |
1da177e4 | 153 | .name = "Commodore A2091/A590 SCSI", |
408bb25b AV |
154 | .show_info = wd33c93_show_info, |
155 | .write_info = wd33c93_write_info, | |
c737e22c | 156 | .proc_name = "A2901", |
1da177e4 LT |
157 | .queuecommand = wd33c93_queuecommand, |
158 | .eh_abort_handler = wd33c93_abort, | |
1da177e4 LT |
159 | .eh_host_reset_handler = wd33c93_host_reset, |
160 | .can_queue = CAN_QUEUE, | |
161 | .this_id = 7, | |
162 | .sg_tablesize = SG_ALL, | |
163 | .cmd_per_lun = CMD_PER_LUN, | |
4af14d11 | 164 | .dma_boundary = PAGE_SIZE - 1, |
1da177e4 LT |
165 | }; |
166 | ||
6f039790 | 167 | static int a2091_probe(struct zorro_dev *z, const struct zorro_device_id *ent) |
c737e22c GU |
168 | { |
169 | struct Scsi_Host *instance; | |
170 | int error; | |
171 | struct a2091_scsiregs *regs; | |
172 | wd33c93_regs wdregs; | |
65c2784a | 173 | struct a2091_hostdata *hdata; |
c737e22c GU |
174 | |
175 | if (!request_mem_region(z->resource.start, 256, "wd33c93")) | |
176 | return -EBUSY; | |
177 | ||
178 | instance = scsi_host_alloc(&a2091_scsi_template, | |
65c2784a | 179 | sizeof(struct a2091_hostdata)); |
c737e22c GU |
180 | if (!instance) { |
181 | error = -ENOMEM; | |
182 | goto fail_alloc; | |
183 | } | |
184 | ||
c737e22c GU |
185 | instance->irq = IRQ_AMIGA_PORTS; |
186 | instance->unique_id = z->slotaddr; | |
187 | ||
6112ea08 | 188 | regs = ZTWO_VADDR(z->resource.start); |
c737e22c GU |
189 | regs->DAWR = DAWR_A2091; |
190 | ||
191 | wdregs.SASR = ®s->SASR; | |
192 | wdregs.SCMD = ®s->SCMD; | |
1da177e4 | 193 | |
c737e22c | 194 | hdata = shost_priv(instance); |
65c2784a GU |
195 | hdata->wh.no_sync = 0xff; |
196 | hdata->wh.fast = 0; | |
197 | hdata->wh.dma_mode = CTRL_DMA; | |
198 | hdata->regs = regs; | |
c737e22c GU |
199 | |
200 | wd33c93_init(instance, wdregs, dma_setup, dma_stop, WD33C93_FS_8_10); | |
201 | error = request_irq(IRQ_AMIGA_PORTS, a2091_intr, IRQF_SHARED, | |
202 | "A2091 SCSI", instance); | |
203 | if (error) | |
204 | goto fail_irq; | |
205 | ||
206 | regs->CNTR = CNTR_PDMD | CNTR_INTEN; | |
207 | ||
208 | error = scsi_add_host(instance, NULL); | |
209 | if (error) | |
210 | goto fail_host; | |
211 | ||
212 | zorro_set_drvdata(z, instance); | |
213 | ||
214 | scsi_scan_host(instance); | |
215 | return 0; | |
1da177e4 | 216 | |
c737e22c GU |
217 | fail_host: |
218 | free_irq(IRQ_AMIGA_PORTS, instance); | |
219 | fail_irq: | |
220 | scsi_host_put(instance); | |
221 | fail_alloc: | |
222 | release_mem_region(z->resource.start, 256); | |
223 | return error; | |
224 | } | |
225 | ||
6f039790 | 226 | static void a2091_remove(struct zorro_dev *z) |
1da177e4 | 227 | { |
c737e22c | 228 | struct Scsi_Host *instance = zorro_get_drvdata(z); |
65c2784a | 229 | struct a2091_hostdata *hdata = shost_priv(instance); |
b1de6ab7 | 230 | |
65c2784a | 231 | hdata->regs->CNTR = 0; |
c737e22c | 232 | scsi_remove_host(instance); |
1da177e4 | 233 | free_irq(IRQ_AMIGA_PORTS, instance); |
c737e22c GU |
234 | scsi_host_put(instance); |
235 | release_mem_region(z->resource.start, 256); | |
236 | } | |
237 | ||
6f039790 | 238 | static struct zorro_device_id a2091_zorro_tbl[] = { |
c737e22c GU |
239 | { ZORRO_PROD_CBM_A590_A2091_1 }, |
240 | { ZORRO_PROD_CBM_A590_A2091_2 }, | |
241 | { 0 } | |
242 | }; | |
243 | MODULE_DEVICE_TABLE(zorro, a2091_zorro_tbl); | |
244 | ||
245 | static struct zorro_driver a2091_driver = { | |
246 | .name = "a2091", | |
247 | .id_table = a2091_zorro_tbl, | |
248 | .probe = a2091_probe, | |
6f039790 | 249 | .remove = a2091_remove, |
c737e22c GU |
250 | }; |
251 | ||
252 | static int __init a2091_init(void) | |
253 | { | |
254 | return zorro_register_driver(&a2091_driver); | |
255 | } | |
256 | module_init(a2091_init); | |
257 | ||
258 | static void __exit a2091_exit(void) | |
259 | { | |
260 | zorro_unregister_driver(&a2091_driver); | |
1da177e4 | 261 | } |
c737e22c | 262 | module_exit(a2091_exit); |
1da177e4 | 263 | |
c737e22c | 264 | MODULE_DESCRIPTION("Commodore A2091/A590 SCSI"); |
1da177e4 | 265 | MODULE_LICENSE("GPL"); |