1 // SPDX-License-Identifier: GPL-2.0-only
2 #include <linux/types.h>
3 #include <linux/mm.h>
4 #include <linux/ioport.h>
5 #include <linux/init.h>
6 #include <linux/slab.h>
7 #include <linux/spinlock.h>
8 #include <linux/interrupt.h>
9 #include <linux/platform_device.h>
10 #include <linux/module.h>
11
12 #include <asm/page.h>
13 #include <asm/pgtable.h>
14 #include <asm/amigaints.h>
15 #include <asm/amigahw.h>
16
17 #include "scsi.h"
18 #include "wd33c93.h"
19 #include "a3000.h"
20
21
22 struct a3000_hostdata {
23 struct WD33C93_hostdata wh;
24 struct a3000_scsiregs *regs;
25 };
26
a3000_intr(int irq,void * data)27 static irqreturn_t a3000_intr(int irq, void *data)
28 {
29 struct Scsi_Host *instance = data;
30 struct a3000_hostdata *hdata = shost_priv(instance);
31 unsigned int status = hdata->regs->ISTR;
32 unsigned long flags;
33
34 if (!(status & ISTR_INT_P))
35 return IRQ_NONE;
36 if (status & ISTR_INTS) {
37 spin_lock_irqsave(instance->host_lock, flags);
38 wd33c93_intr(instance);
39 spin_unlock_irqrestore(instance->host_lock, flags);
40 return IRQ_HANDLED;
41 }
42 pr_warning("Non-serviced A3000 SCSI-interrupt? ISTR = %02x\n", status);
43 return IRQ_NONE;
44 }
45
dma_setup(struct scsi_cmnd * cmd,int dir_in)46 static int dma_setup(struct scsi_cmnd *cmd, int dir_in)
47 {
48 struct Scsi_Host *instance = cmd->device->host;
49 struct a3000_hostdata *hdata = shost_priv(instance);
50 struct WD33C93_hostdata *wh = &hdata->wh;
51 struct a3000_scsiregs *regs = hdata->regs;
52 unsigned short cntr = CNTR_PDMD | CNTR_INTEN;
53 unsigned long addr = virt_to_bus(cmd->SCp.ptr);
54
55 /*
56 * if the physical address has the wrong alignment, or if
57 * physical address is bad, or if it is a write and at the
58 * end of a physical memory chunk, then allocate a bounce
59 * buffer
60 */
61 if (addr & A3000_XFER_MASK) {
62 wh->dma_bounce_len = (cmd->SCp.this_residual + 511) & ~0x1ff;
63 wh->dma_bounce_buffer = kmalloc(wh->dma_bounce_len,
64 GFP_KERNEL);
65
66 /* can't allocate memory; use PIO */
67 if (!wh->dma_bounce_buffer) {
68 wh->dma_bounce_len = 0;
69 return 1;
70 }
71
72 if (!dir_in) {
73 /* copy to bounce buffer for a write */
74 memcpy(wh->dma_bounce_buffer, cmd->SCp.ptr,
75 cmd->SCp.this_residual);
76 }
77
78 addr = virt_to_bus(wh->dma_bounce_buffer);
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
101 /* start DMA */
102 mb(); /* make sure setup is completed */
103 regs->ST_DMA = 1;
104 mb(); /* make sure DMA has started before next IO */
105
106 /* return success */
107 return 0;
108 }
109
dma_stop(struct Scsi_Host * instance,struct scsi_cmnd * SCpnt,int status)110 static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt,
111 int status)
112 {
113 struct a3000_hostdata *hdata = shost_priv(instance);
114 struct WD33C93_hostdata *wh = &hdata->wh;
115 struct a3000_scsiregs *regs = hdata->regs;
116
117 /* disable SCSI interrupts */
118 unsigned short cntr = CNTR_PDMD;
119
120 if (!wh->dma_dir)
121 cntr |= CNTR_DDIR;
122
123 regs->CNTR = cntr;
124 mb(); /* make sure CNTR is updated before next IO */
125
126 /* flush if we were reading */
127 if (wh->dma_dir) {
128 regs->FLUSH = 1;
129 mb(); /* don't allow prefetch */
130 while (!(regs->ISTR & ISTR_FE_FLG))
131 barrier();
132 mb(); /* no IO until FLUSH is done */
133 }
134
135 /* clear a possible interrupt */
136 /* I think that this CINT is only necessary if you are
137 * using the terminal count features. HM 7 Mar 1994
138 */
139 regs->CINT = 1;
140
141 /* stop DMA */
142 regs->SP_DMA = 1;
143 mb(); /* make sure DMA is stopped before next IO */
144
145 /* restore the CONTROL bits (minus the direction flag) */
146 regs->CNTR = CNTR_PDMD | CNTR_INTEN;
147 mb(); /* make sure CNTR is updated before next IO */
148
149 /* copy from a bounce buffer, if necessary */
150 if (status && wh->dma_bounce_buffer) {
151 if (SCpnt) {
152 if (wh->dma_dir && SCpnt)
153 memcpy(SCpnt->SCp.ptr, wh->dma_bounce_buffer,
154 SCpnt->SCp.this_residual);
155 kfree(wh->dma_bounce_buffer);
156 wh->dma_bounce_buffer = NULL;
157 wh->dma_bounce_len = 0;
158 } else {
159 kfree(wh->dma_bounce_buffer);
160 wh->dma_bounce_buffer = NULL;
161 wh->dma_bounce_len = 0;
162 }
163 }
164 }
165
166 static struct scsi_host_template amiga_a3000_scsi_template = {
167 .module = THIS_MODULE,
168 .name = "Amiga 3000 built-in SCSI",
169 .show_info = wd33c93_show_info,
170 .write_info = wd33c93_write_info,
171 .proc_name = "A3000",
172 .queuecommand = wd33c93_queuecommand,
173 .eh_abort_handler = wd33c93_abort,
174 .eh_host_reset_handler = wd33c93_host_reset,
175 .can_queue = CAN_QUEUE,
176 .this_id = 7,
177 .sg_tablesize = SG_ALL,
178 .cmd_per_lun = CMD_PER_LUN,
179 };
180
amiga_a3000_scsi_probe(struct platform_device * pdev)181 static int __init amiga_a3000_scsi_probe(struct platform_device *pdev)
182 {
183 struct resource *res;
184 struct Scsi_Host *instance;
185 int error;
186 struct a3000_scsiregs *regs;
187 wd33c93_regs wdregs;
188 struct a3000_hostdata *hdata;
189
190 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
191 if (!res)
192 return -ENODEV;
193
194 if (!request_mem_region(res->start, resource_size(res), "wd33c93"))
195 return -EBUSY;
196
197 instance = scsi_host_alloc(&amiga_a3000_scsi_template,
198 sizeof(struct a3000_hostdata));
199 if (!instance) {
200 error = -ENOMEM;
201 goto fail_alloc;
202 }
203
204 instance->irq = IRQ_AMIGA_PORTS;
205
206 regs = ZTWO_VADDR(res->start);
207 regs->DAWR = DAWR_A3000;
208
209 wdregs.SASR = ®s->SASR;
210 wdregs.SCMD = ®s->SCMD;
211
212 hdata = shost_priv(instance);
213 hdata->wh.no_sync = 0xff;
214 hdata->wh.fast = 0;
215 hdata->wh.dma_mode = CTRL_DMA;
216 hdata->regs = regs;
217
218 wd33c93_init(instance, wdregs, dma_setup, dma_stop, WD33C93_FS_12_15);
219 error = request_irq(IRQ_AMIGA_PORTS, a3000_intr, IRQF_SHARED,
220 "A3000 SCSI", instance);
221 if (error)
222 goto fail_irq;
223
224 regs->CNTR = CNTR_PDMD | CNTR_INTEN;
225
226 error = scsi_add_host(instance, NULL);
227 if (error)
228 goto fail_host;
229
230 platform_set_drvdata(pdev, instance);
231
232 scsi_scan_host(instance);
233 return 0;
234
235 fail_host:
236 free_irq(IRQ_AMIGA_PORTS, instance);
237 fail_irq:
238 scsi_host_put(instance);
239 fail_alloc:
240 release_mem_region(res->start, resource_size(res));
241 return error;
242 }
243
amiga_a3000_scsi_remove(struct platform_device * pdev)244 static int __exit amiga_a3000_scsi_remove(struct platform_device *pdev)
245 {
246 struct Scsi_Host *instance = platform_get_drvdata(pdev);
247 struct a3000_hostdata *hdata = shost_priv(instance);
248 struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
249
250 hdata->regs->CNTR = 0;
251 scsi_remove_host(instance);
252 free_irq(IRQ_AMIGA_PORTS, instance);
253 scsi_host_put(instance);
254 release_mem_region(res->start, resource_size(res));
255 return 0;
256 }
257
258 static struct platform_driver amiga_a3000_scsi_driver = {
259 .remove = __exit_p(amiga_a3000_scsi_remove),
260 .driver = {
261 .name = "amiga-a3000-scsi",
262 },
263 };
264
265 module_platform_driver_probe(amiga_a3000_scsi_driver, amiga_a3000_scsi_probe);
266
267 MODULE_DESCRIPTION("Amiga 3000 built-in SCSI");
268 MODULE_LICENSE("GPL");
269 MODULE_ALIAS("platform:amiga-a3000-scsi");
270