1 // SPDX-License-Identifier: GPL-2.0-only
2 #include <linux/types.h>
3 #include <linux/init.h>
4 #include <linux/interrupt.h>
5 #include <linux/mm.h>
6 #include <linux/slab.h>
7 #include <linux/spinlock.h>
8 #include <linux/zorro.h>
9 #include <linux/module.h>
10
11 #include <asm/page.h>
12 #include <asm/pgtable.h>
13 #include <asm/amigaints.h>
14 #include <asm/amigahw.h>
15
16 #include "scsi.h"
17 #include "wd33c93.h"
18 #include "a2091.h"
19
20
21 struct a2091_hostdata {
22 struct WD33C93_hostdata wh;
23 struct a2091_scsiregs *regs;
24 };
25
a2091_intr(int irq,void * data)26 static irqreturn_t a2091_intr(int irq, void *data)
27 {
28 struct Scsi_Host *instance = data;
29 struct a2091_hostdata *hdata = shost_priv(instance);
30 unsigned int status = hdata->regs->ISTR;
31 unsigned long flags;
32
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;
40 }
41
dma_setup(struct scsi_cmnd * cmd,int dir_in)42 static int dma_setup(struct scsi_cmnd *cmd, int dir_in)
43 {
44 struct Scsi_Host *instance = cmd->device->host;
45 struct a2091_hostdata *hdata = shost_priv(instance);
46 struct WD33C93_hostdata *wh = &hdata->wh;
47 struct a2091_scsiregs *regs = hdata->regs;
48 unsigned short cntr = CNTR_PDMD | CNTR_INTEN;
49 unsigned long addr = virt_to_bus(cmd->SCp.ptr);
50
51 /* don't allow DMA if the physical address is bad */
52 if (addr & A2091_XFER_MASK) {
53 wh->dma_bounce_len = (cmd->SCp.this_residual + 511) & ~0x1ff;
54 wh->dma_bounce_buffer = kmalloc(wh->dma_bounce_len,
55 GFP_KERNEL);
56
57 /* can't allocate memory; use PIO */
58 if (!wh->dma_bounce_buffer) {
59 wh->dma_bounce_len = 0;
60 return 1;
61 }
62
63 /* get the physical address of the bounce buffer */
64 addr = virt_to_bus(wh->dma_bounce_buffer);
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 */
69 kfree(wh->dma_bounce_buffer);
70 wh->dma_bounce_buffer = NULL;
71 wh->dma_bounce_len = 0;
72 return 1;
73 }
74
75 if (!dir_in) {
76 /* copy to bounce buffer for a write */
77 memcpy(wh->dma_bounce_buffer, cmd->SCp.ptr,
78 cmd->SCp.this_residual);
79 }
80 }
81
82 /* setup dma direction */
83 if (!dir_in)
84 cntr |= CNTR_DDIR;
85
86 /* remember direction */
87 wh->dma_dir = dir_in;
88
89 regs->CNTR = cntr;
90
91 /* setup DMA *physical* address */
92 regs->ACR = addr;
93
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 */
102 regs->ST_DMA = 1;
103
104 /* return success */
105 return 0;
106 }
107
dma_stop(struct Scsi_Host * instance,struct scsi_cmnd * SCpnt,int status)108 static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt,
109 int status)
110 {
111 struct a2091_hostdata *hdata = shost_priv(instance);
112 struct WD33C93_hostdata *wh = &hdata->wh;
113 struct a2091_scsiregs *regs = hdata->regs;
114
115 /* disable SCSI interrupts */
116 unsigned short cntr = CNTR_PDMD;
117
118 if (!wh->dma_dir)
119 cntr |= CNTR_DDIR;
120
121 /* disable SCSI interrupts */
122 regs->CNTR = cntr;
123
124 /* flush if we were reading */
125 if (wh->dma_dir) {
126 regs->FLUSH = 1;
127 while (!(regs->ISTR & ISTR_FE_FLG))
128 ;
129 }
130
131 /* clear a possible interrupt */
132 regs->CINT = 1;
133
134 /* stop DMA */
135 regs->SP_DMA = 1;
136
137 /* restore the CONTROL bits (minus the direction flag) */
138 regs->CNTR = CNTR_PDMD | CNTR_INTEN;
139
140 /* copy from a bounce buffer, if necessary */
141 if (status && wh->dma_bounce_buffer) {
142 if (wh->dma_dir)
143 memcpy(SCpnt->SCp.ptr, wh->dma_bounce_buffer,
144 SCpnt->SCp.this_residual);
145 kfree(wh->dma_bounce_buffer);
146 wh->dma_bounce_buffer = NULL;
147 wh->dma_bounce_len = 0;
148 }
149 }
150
151 static struct scsi_host_template a2091_scsi_template = {
152 .module = THIS_MODULE,
153 .name = "Commodore A2091/A590 SCSI",
154 .show_info = wd33c93_show_info,
155 .write_info = wd33c93_write_info,
156 .proc_name = "A2901",
157 .queuecommand = wd33c93_queuecommand,
158 .eh_abort_handler = wd33c93_abort,
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,
164 .dma_boundary = PAGE_SIZE - 1,
165 };
166
a2091_probe(struct zorro_dev * z,const struct zorro_device_id * ent)167 static int a2091_probe(struct zorro_dev *z, const struct zorro_device_id *ent)
168 {
169 struct Scsi_Host *instance;
170 int error;
171 struct a2091_scsiregs *regs;
172 wd33c93_regs wdregs;
173 struct a2091_hostdata *hdata;
174
175 if (!request_mem_region(z->resource.start, 256, "wd33c93"))
176 return -EBUSY;
177
178 instance = scsi_host_alloc(&a2091_scsi_template,
179 sizeof(struct a2091_hostdata));
180 if (!instance) {
181 error = -ENOMEM;
182 goto fail_alloc;
183 }
184
185 instance->irq = IRQ_AMIGA_PORTS;
186 instance->unique_id = z->slotaddr;
187
188 regs = ZTWO_VADDR(z->resource.start);
189 regs->DAWR = DAWR_A2091;
190
191 wdregs.SASR = ®s->SASR;
192 wdregs.SCMD = ®s->SCMD;
193
194 hdata = shost_priv(instance);
195 hdata->wh.no_sync = 0xff;
196 hdata->wh.fast = 0;
197 hdata->wh.dma_mode = CTRL_DMA;
198 hdata->regs = regs;
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;
216
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
a2091_remove(struct zorro_dev * z)226 static void a2091_remove(struct zorro_dev *z)
227 {
228 struct Scsi_Host *instance = zorro_get_drvdata(z);
229 struct a2091_hostdata *hdata = shost_priv(instance);
230
231 hdata->regs->CNTR = 0;
232 scsi_remove_host(instance);
233 free_irq(IRQ_AMIGA_PORTS, instance);
234 scsi_host_put(instance);
235 release_mem_region(z->resource.start, 256);
236 }
237
238 static struct zorro_device_id a2091_zorro_tbl[] = {
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,
249 .remove = a2091_remove,
250 };
251
a2091_init(void)252 static int __init a2091_init(void)
253 {
254 return zorro_register_driver(&a2091_driver);
255 }
256 module_init(a2091_init);
257
a2091_exit(void)258 static void __exit a2091_exit(void)
259 {
260 zorro_unregister_driver(&a2091_driver);
261 }
262 module_exit(a2091_exit);
263
264 MODULE_DESCRIPTION("Commodore A2091/A590 SCSI");
265 MODULE_LICENSE("GPL");
266