GNU Linux-libre 5.10.219-gnu1
[releases.git] / drivers / scsi / a2091.c
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/amigaints.h>
13 #include <asm/amigahw.h>
14
15 #include "scsi.h"
16 #include "wd33c93.h"
17 #include "a2091.h"
18
19
20 struct a2091_hostdata {
21         struct WD33C93_hostdata wh;
22         struct a2091_scsiregs *regs;
23 };
24
25 static irqreturn_t a2091_intr(int irq, void *data)
26 {
27         struct Scsi_Host *instance = data;
28         struct a2091_hostdata *hdata = shost_priv(instance);
29         unsigned int status = hdata->regs->ISTR;
30         unsigned long flags;
31
32         if (!(status & (ISTR_INT_F | ISTR_INT_P)) || !(status & ISTR_INTS))
33                 return IRQ_NONE;
34
35         spin_lock_irqsave(instance->host_lock, flags);
36         wd33c93_intr(instance);
37         spin_unlock_irqrestore(instance->host_lock, flags);
38         return IRQ_HANDLED;
39 }
40
41 static int dma_setup(struct scsi_cmnd *cmd, int dir_in)
42 {
43         struct Scsi_Host *instance = cmd->device->host;
44         struct a2091_hostdata *hdata = shost_priv(instance);
45         struct WD33C93_hostdata *wh = &hdata->wh;
46         struct a2091_scsiregs *regs = hdata->regs;
47         unsigned short cntr = CNTR_PDMD | CNTR_INTEN;
48         unsigned long addr = virt_to_bus(cmd->SCp.ptr);
49
50         /* don't allow DMA if the physical address is bad */
51         if (addr & A2091_XFER_MASK) {
52                 wh->dma_bounce_len = (cmd->SCp.this_residual + 511) & ~0x1ff;
53                 wh->dma_bounce_buffer = kmalloc(wh->dma_bounce_len,
54                                                 GFP_KERNEL);
55
56                 /* can't allocate memory; use PIO */
57                 if (!wh->dma_bounce_buffer) {
58                         wh->dma_bounce_len = 0;
59                         return 1;
60                 }
61
62                 /* get the physical address of the bounce buffer */
63                 addr = virt_to_bus(wh->dma_bounce_buffer);
64
65                 /* the bounce buffer may not be in the first 16M of physmem */
66                 if (addr & A2091_XFER_MASK) {
67                         /* we could use chipmem... maybe later */
68                         kfree(wh->dma_bounce_buffer);
69                         wh->dma_bounce_buffer = NULL;
70                         wh->dma_bounce_len = 0;
71                         return 1;
72                 }
73
74                 if (!dir_in) {
75                         /* copy to bounce buffer for a write */
76                         memcpy(wh->dma_bounce_buffer, cmd->SCp.ptr,
77                                cmd->SCp.this_residual);
78                 }
79         }
80
81         /* setup dma direction */
82         if (!dir_in)
83                 cntr |= CNTR_DDIR;
84
85         /* remember direction */
86         wh->dma_dir = dir_in;
87
88         regs->CNTR = cntr;
89
90         /* setup DMA *physical* address */
91         regs->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         regs->ST_DMA = 1;
102
103         /* return success */
104         return 0;
105 }
106
107 static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt,
108                      int status)
109 {
110         struct a2091_hostdata *hdata = shost_priv(instance);
111         struct WD33C93_hostdata *wh = &hdata->wh;
112         struct a2091_scsiregs *regs = hdata->regs;
113
114         /* disable SCSI interrupts */
115         unsigned short cntr = CNTR_PDMD;
116
117         if (!wh->dma_dir)
118                 cntr |= CNTR_DDIR;
119
120         /* disable SCSI interrupts */
121         regs->CNTR = cntr;
122
123         /* flush if we were reading */
124         if (wh->dma_dir) {
125                 regs->FLUSH = 1;
126                 while (!(regs->ISTR & ISTR_FE_FLG))
127                         ;
128         }
129
130         /* clear a possible interrupt */
131         regs->CINT = 1;
132
133         /* stop DMA */
134         regs->SP_DMA = 1;
135
136         /* restore the CONTROL bits (minus the direction flag) */
137         regs->CNTR = CNTR_PDMD | CNTR_INTEN;
138
139         /* copy from a bounce buffer, if necessary */
140         if (status && wh->dma_bounce_buffer) {
141                 if (wh->dma_dir)
142                         memcpy(SCpnt->SCp.ptr, wh->dma_bounce_buffer,
143                                SCpnt->SCp.this_residual);
144                 kfree(wh->dma_bounce_buffer);
145                 wh->dma_bounce_buffer = NULL;
146                 wh->dma_bounce_len = 0;
147         }
148 }
149
150 static struct scsi_host_template a2091_scsi_template = {
151         .module                 = THIS_MODULE,
152         .name                   = "Commodore A2091/A590 SCSI",
153         .show_info              = wd33c93_show_info,
154         .write_info             = wd33c93_write_info,
155         .proc_name              = "A2901",
156         .queuecommand           = wd33c93_queuecommand,
157         .eh_abort_handler       = wd33c93_abort,
158         .eh_host_reset_handler  = wd33c93_host_reset,
159         .can_queue              = CAN_QUEUE,
160         .this_id                = 7,
161         .sg_tablesize           = SG_ALL,
162         .cmd_per_lun            = CMD_PER_LUN,
163         .dma_boundary           = PAGE_SIZE - 1,
164 };
165
166 static int a2091_probe(struct zorro_dev *z, const struct zorro_device_id *ent)
167 {
168         struct Scsi_Host *instance;
169         int error;
170         struct a2091_scsiregs *regs;
171         wd33c93_regs wdregs;
172         struct a2091_hostdata *hdata;
173
174         if (!request_mem_region(z->resource.start, 256, "wd33c93"))
175                 return -EBUSY;
176
177         instance = scsi_host_alloc(&a2091_scsi_template,
178                                    sizeof(struct a2091_hostdata));
179         if (!instance) {
180                 error = -ENOMEM;
181                 goto fail_alloc;
182         }
183
184         instance->irq = IRQ_AMIGA_PORTS;
185         instance->unique_id = z->slotaddr;
186
187         regs = ZTWO_VADDR(z->resource.start);
188         regs->DAWR = DAWR_A2091;
189
190         wdregs.SASR = &regs->SASR;
191         wdregs.SCMD = &regs->SCMD;
192
193         hdata = shost_priv(instance);
194         hdata->wh.no_sync = 0xff;
195         hdata->wh.fast = 0;
196         hdata->wh.dma_mode = CTRL_DMA;
197         hdata->regs = regs;
198
199         wd33c93_init(instance, wdregs, dma_setup, dma_stop, WD33C93_FS_8_10);
200         error = request_irq(IRQ_AMIGA_PORTS, a2091_intr, IRQF_SHARED,
201                             "A2091 SCSI", instance);
202         if (error)
203                 goto fail_irq;
204
205         regs->CNTR = CNTR_PDMD | CNTR_INTEN;
206
207         error = scsi_add_host(instance, NULL);
208         if (error)
209                 goto fail_host;
210
211         zorro_set_drvdata(z, instance);
212
213         scsi_scan_host(instance);
214         return 0;
215
216 fail_host:
217         free_irq(IRQ_AMIGA_PORTS, instance);
218 fail_irq:
219         scsi_host_put(instance);
220 fail_alloc:
221         release_mem_region(z->resource.start, 256);
222         return error;
223 }
224
225 static void a2091_remove(struct zorro_dev *z)
226 {
227         struct Scsi_Host *instance = zorro_get_drvdata(z);
228         struct a2091_hostdata *hdata = shost_priv(instance);
229
230         hdata->regs->CNTR = 0;
231         scsi_remove_host(instance);
232         free_irq(IRQ_AMIGA_PORTS, instance);
233         scsi_host_put(instance);
234         release_mem_region(z->resource.start, 256);
235 }
236
237 static struct zorro_device_id a2091_zorro_tbl[] = {
238         { ZORRO_PROD_CBM_A590_A2091_1 },
239         { ZORRO_PROD_CBM_A590_A2091_2 },
240         { 0 }
241 };
242 MODULE_DEVICE_TABLE(zorro, a2091_zorro_tbl);
243
244 static struct zorro_driver a2091_driver = {
245         .name           = "a2091",
246         .id_table       = a2091_zorro_tbl,
247         .probe          = a2091_probe,
248         .remove         = a2091_remove,
249 };
250
251 static int __init a2091_init(void)
252 {
253         return zorro_register_driver(&a2091_driver);
254 }
255 module_init(a2091_init);
256
257 static void __exit a2091_exit(void)
258 {
259         zorro_unregister_driver(&a2091_driver);
260 }
261 module_exit(a2091_exit);
262
263 MODULE_DESCRIPTION("Commodore A2091/A590 SCSI");
264 MODULE_LICENSE("GPL");