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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/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 | ||
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 | ||
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 | ||
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 | ||
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 | ||
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"); |