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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/dma-mapping.h>
11#include <linux/module.h>
12
13#include <asm/page.h>
14#include <asm/amigaints.h>
15#include <asm/amigahw.h>
16
17#include <scsi/scsi.h>
18#include <scsi/scsi_cmnd.h>
19#include <scsi/scsi_device.h>
20#include <scsi/scsi_eh.h>
21#include <scsi/scsi_tcq.h>
22#include "wd33c93.h"
23#include "a3000.h"
24
25
26struct a3000_hostdata {
27 struct WD33C93_hostdata wh;
28 struct a3000_scsiregs *regs;
29 struct device *dev;
30};
31
32#define DMA_DIR(d) ((d == DATA_OUT_DIR) ? DMA_TO_DEVICE : DMA_FROM_DEVICE)
33
34static irqreturn_t a3000_intr(int irq, void *data)
35{
36 struct Scsi_Host *instance = data;
37 struct a3000_hostdata *hdata = shost_priv(instance);
38 unsigned int status = hdata->regs->ISTR;
39 unsigned long flags;
40
41 if (!(status & ISTR_INT_P))
42 return IRQ_NONE;
43 if (status & ISTR_INTS) {
44 spin_lock_irqsave(instance->host_lock, flags);
45 wd33c93_intr(instance);
46 spin_unlock_irqrestore(instance->host_lock, flags);
47 return IRQ_HANDLED;
48 }
49 pr_warn("Non-serviced A3000 SCSI-interrupt? ISTR = %02x\n", status);
50 return IRQ_NONE;
51}
52
53static int dma_setup(struct scsi_cmnd *cmd, int dir_in)
54{
55 struct scsi_pointer *scsi_pointer = WD33C93_scsi_pointer(cmd);
56 unsigned long len = scsi_pointer->this_residual;
57 struct Scsi_Host *instance = cmd->device->host;
58 struct a3000_hostdata *hdata = shost_priv(instance);
59 struct WD33C93_hostdata *wh = &hdata->wh;
60 struct a3000_scsiregs *regs = hdata->regs;
61 unsigned short cntr = CNTR_PDMD | CNTR_INTEN;
62 dma_addr_t addr;
63
64 addr = dma_map_single(hdata->dev, scsi_pointer->ptr,
65 len, DMA_DIR(dir_in));
66 if (dma_mapping_error(hdata->dev, addr)) {
67 dev_warn(hdata->dev, "cannot map SCSI data block %p\n",
68 scsi_pointer->ptr);
69 return 1;
70 }
71 scsi_pointer->dma_handle = addr;
72
73 /*
74 * if the physical address has the wrong alignment, or if
75 * physical address is bad, or if it is a write and at the
76 * end of a physical memory chunk, then allocate a bounce
77 * buffer
78 * MSch 20220629 - only wrong alignment tested - bounce
79 * buffer returned by kmalloc is guaranteed to be aligned
80 */
81 if (addr & A3000_XFER_MASK) {
82 WARN_ONCE(1, "Invalid alignment for DMA!");
83 /* drop useless mapping */
84 dma_unmap_single(hdata->dev, scsi_pointer->dma_handle,
85 scsi_pointer->this_residual,
86 DMA_DIR(dir_in));
87
88 wh->dma_bounce_len = (scsi_pointer->this_residual + 511) & ~0x1ff;
89 wh->dma_bounce_buffer = kmalloc(wh->dma_bounce_len,
90 GFP_KERNEL);
91
92 /* can't allocate memory; use PIO */
93 if (!wh->dma_bounce_buffer) {
94 wh->dma_bounce_len = 0;
95 scsi_pointer->dma_handle = (dma_addr_t) NULL;
96 return 1;
97 }
98
99 if (!dir_in) {
100 /* copy to bounce buffer for a write */
101 memcpy(wh->dma_bounce_buffer, scsi_pointer->ptr,
102 scsi_pointer->this_residual);
103 }
104
105 addr = dma_map_single(hdata->dev, scsi_pointer->ptr,
106 len, DMA_DIR(dir_in));
107 if (dma_mapping_error(hdata->dev, addr)) {
108 dev_warn(hdata->dev,
109 "cannot map SCSI data block %p\n",
110 scsi_pointer->ptr);
111 return 1;
112 }
113 scsi_pointer->dma_handle = addr;
114 }
115
116 /* setup dma direction */
117 if (!dir_in)
118 cntr |= CNTR_DDIR;
119
120 /* remember direction */
121 wh->dma_dir = dir_in;
122
123 regs->CNTR = cntr;
124
125 /* setup DMA *physical* address */
126 regs->ACR = addr;
127
128 /* no more cache flush here - dma_map_single() takes care */
129
130 /* start DMA */
131 mb(); /* make sure setup is completed */
132 regs->ST_DMA = 1;
133 mb(); /* make sure DMA has started before next IO */
134
135 /* return success */
136 return 0;
137}
138
139static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt,
140 int status)
141{
142 struct scsi_pointer *scsi_pointer = WD33C93_scsi_pointer(SCpnt);
143 struct a3000_hostdata *hdata = shost_priv(instance);
144 struct WD33C93_hostdata *wh = &hdata->wh;
145 struct a3000_scsiregs *regs = hdata->regs;
146
147 /* disable SCSI interrupts */
148 unsigned short cntr = CNTR_PDMD;
149
150 if (!wh->dma_dir)
151 cntr |= CNTR_DDIR;
152
153 regs->CNTR = cntr;
154 mb(); /* make sure CNTR is updated before next IO */
155
156 /* flush if we were reading */
157 if (wh->dma_dir) {
158 regs->FLUSH = 1;
159 mb(); /* don't allow prefetch */
160 while (!(regs->ISTR & ISTR_FE_FLG))
161 barrier();
162 mb(); /* no IO until FLUSH is done */
163 }
164
165 /* clear a possible interrupt */
166 /* I think that this CINT is only necessary if you are
167 * using the terminal count features. HM 7 Mar 1994
168 */
169 regs->CINT = 1;
170
171 /* stop DMA */
172 regs->SP_DMA = 1;
173 mb(); /* make sure DMA is stopped before next IO */
174
175 /* restore the CONTROL bits (minus the direction flag) */
176 regs->CNTR = CNTR_PDMD | CNTR_INTEN;
177 mb(); /* make sure CNTR is updated before next IO */
178
179 dma_unmap_single(hdata->dev, scsi_pointer->dma_handle,
180 scsi_pointer->this_residual,
181 DMA_DIR(wh->dma_dir));
182
183 /* copy from a bounce buffer, if necessary */
184 if (status && wh->dma_bounce_buffer) {
185 if (SCpnt) {
186 if (wh->dma_dir && SCpnt)
187 memcpy(scsi_pointer->ptr, wh->dma_bounce_buffer,
188 scsi_pointer->this_residual);
189 kfree(wh->dma_bounce_buffer);
190 wh->dma_bounce_buffer = NULL;
191 wh->dma_bounce_len = 0;
192 } else {
193 kfree(wh->dma_bounce_buffer);
194 wh->dma_bounce_buffer = NULL;
195 wh->dma_bounce_len = 0;
196 }
197 }
198}
199
200static const struct scsi_host_template amiga_a3000_scsi_template = {
201 .module = THIS_MODULE,
202 .name = "Amiga 3000 built-in SCSI",
203 .show_info = wd33c93_show_info,
204 .write_info = wd33c93_write_info,
205 .proc_name = "A3000",
206 .queuecommand = wd33c93_queuecommand,
207 .eh_abort_handler = wd33c93_abort,
208 .eh_host_reset_handler = wd33c93_host_reset,
209 .can_queue = CAN_QUEUE,
210 .this_id = 7,
211 .sg_tablesize = SG_ALL,
212 .cmd_per_lun = CMD_PER_LUN,
213 .cmd_size = sizeof(struct scsi_pointer),
214};
215
216static int __init amiga_a3000_scsi_probe(struct platform_device *pdev)
217{
218 struct resource *res;
219 struct Scsi_Host *instance;
220 int error;
221 struct a3000_scsiregs *regs;
222 wd33c93_regs wdregs;
223 struct a3000_hostdata *hdata;
224
225 if (dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32))) {
226 dev_warn(&pdev->dev, "cannot use 32 bit DMA\n");
227 return -ENODEV;
228 }
229
230 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
231 if (!res)
232 return -ENODEV;
233
234 if (!request_mem_region(res->start, resource_size(res), "wd33c93"))
235 return -EBUSY;
236
237 instance = scsi_host_alloc(&amiga_a3000_scsi_template,
238 sizeof(struct a3000_hostdata));
239 if (!instance) {
240 error = -ENOMEM;
241 goto fail_alloc;
242 }
243
244 instance->irq = IRQ_AMIGA_PORTS;
245
246 regs = ZTWO_VADDR(res->start);
247 regs->DAWR = DAWR_A3000;
248
249 wdregs.SASR = ®s->SASR;
250 wdregs.SCMD = ®s->SCMD;
251
252 hdata = shost_priv(instance);
253 hdata->dev = &pdev->dev;
254 hdata->wh.no_sync = 0xff;
255 hdata->wh.fast = 0;
256 hdata->wh.dma_mode = CTRL_DMA;
257 hdata->regs = regs;
258
259 wd33c93_init(instance, wdregs, dma_setup, dma_stop, WD33C93_FS_12_15);
260 error = request_irq(IRQ_AMIGA_PORTS, a3000_intr, IRQF_SHARED,
261 "A3000 SCSI", instance);
262 if (error)
263 goto fail_irq;
264
265 regs->CNTR = CNTR_PDMD | CNTR_INTEN;
266
267 error = scsi_add_host(instance, NULL);
268 if (error)
269 goto fail_host;
270
271 platform_set_drvdata(pdev, instance);
272
273 scsi_scan_host(instance);
274 return 0;
275
276fail_host:
277 free_irq(IRQ_AMIGA_PORTS, instance);
278fail_irq:
279 scsi_host_put(instance);
280fail_alloc:
281 release_mem_region(res->start, resource_size(res));
282 return error;
283}
284
285static void __exit amiga_a3000_scsi_remove(struct platform_device *pdev)
286{
287 struct Scsi_Host *instance = platform_get_drvdata(pdev);
288 struct a3000_hostdata *hdata = shost_priv(instance);
289 struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
290
291 hdata->regs->CNTR = 0;
292 scsi_remove_host(instance);
293 free_irq(IRQ_AMIGA_PORTS, instance);
294 scsi_host_put(instance);
295 release_mem_region(res->start, resource_size(res));
296}
297
298static struct platform_driver amiga_a3000_scsi_driver = {
299 .remove_new = __exit_p(amiga_a3000_scsi_remove),
300 .driver = {
301 .name = "amiga-a3000-scsi",
302 },
303};
304
305module_platform_driver_probe(amiga_a3000_scsi_driver, amiga_a3000_scsi_probe);
306
307MODULE_DESCRIPTION("Amiga 3000 built-in SCSI");
308MODULE_LICENSE("GPL");
309MODULE_ALIAS("platform:amiga-a3000-scsi");
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
22struct a3000_hostdata {
23 struct WD33C93_hostdata wh;
24 struct a3000_scsiregs *regs;
25};
26
27static 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
46static 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
110static 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
166static 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
181static 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
235fail_host:
236 free_irq(IRQ_AMIGA_PORTS, instance);
237fail_irq:
238 scsi_host_put(instance);
239fail_alloc:
240 release_mem_region(res->start, resource_size(res));
241 return error;
242}
243
244static 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
258static 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
265module_platform_driver_probe(amiga_a3000_scsi_driver, amiga_a3000_scsi_probe);
266
267MODULE_DESCRIPTION("Amiga 3000 built-in SCSI");
268MODULE_LICENSE("GPL");
269MODULE_ALIAS("platform:amiga-a3000-scsi");