1#include <linux/types.h>
2#include <linux/init.h>
3#include <linux/interrupt.h>
4#include <linux/mm.h>
5#include <linux/slab.h>
6#include <linux/spinlock.h>
7#include <linux/zorro.h>
8#include <linux/module.h>
9
10#include <asm/page.h>
11#include <asm/pgtable.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
20struct a2091_hostdata {
21	struct WD33C93_hostdata wh;
22	struct a2091_scsiregs *regs;
23};
24
25static 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
41static 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
107static 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
150static int a2091_bus_reset(struct scsi_cmnd *cmd)
151{
152	struct Scsi_Host *instance = cmd->device->host;
153
154	/* FIXME perform bus-specific reset */
155
156	/* FIXME 2: kill this function, and let midlayer fall back
157	   to the same action, calling wd33c93_host_reset() */
158
159	spin_lock_irq(instance->host_lock);
160	wd33c93_host_reset(cmd);
161	spin_unlock_irq(instance->host_lock);
162
163	return SUCCESS;
164}
165
166static struct scsi_host_template a2091_scsi_template = {
167	.module			= THIS_MODULE,
168	.name			= "Commodore A2091/A590 SCSI",
169	.show_info		= wd33c93_show_info,
170	.write_info		= wd33c93_write_info,
171	.proc_name		= "A2901",
172	.queuecommand		= wd33c93_queuecommand,
173	.eh_abort_handler	= wd33c93_abort,
174	.eh_bus_reset_handler	= a2091_bus_reset,
175	.eh_host_reset_handler	= wd33c93_host_reset,
176	.can_queue		= CAN_QUEUE,
177	.this_id		= 7,
178	.sg_tablesize		= SG_ALL,
179	.cmd_per_lun		= CMD_PER_LUN,
180	.use_clustering		= DISABLE_CLUSTERING
181};
182
183static int a2091_probe(struct zorro_dev *z, const struct zorro_device_id *ent)
184{
185	struct Scsi_Host *instance;
186	int error;
187	struct a2091_scsiregs *regs;
188	wd33c93_regs wdregs;
189	struct a2091_hostdata *hdata;
190
191	if (!request_mem_region(z->resource.start, 256, "wd33c93"))
192		return -EBUSY;
193
194	instance = scsi_host_alloc(&a2091_scsi_template,
195				   sizeof(struct a2091_hostdata));
196	if (!instance) {
197		error = -ENOMEM;
198		goto fail_alloc;
199	}
200
201	instance->irq = IRQ_AMIGA_PORTS;
202	instance->unique_id = z->slotaddr;
203
204	regs = ZTWO_VADDR(z->resource.start);
205	regs->DAWR = DAWR_A2091;
206
207	wdregs.SASR = &regs->SASR;
208	wdregs.SCMD = &regs->SCMD;
209
210	hdata = shost_priv(instance);
211	hdata->wh.no_sync = 0xff;
212	hdata->wh.fast = 0;
213	hdata->wh.dma_mode = CTRL_DMA;
214	hdata->regs = regs;
215
216	wd33c93_init(instance, wdregs, dma_setup, dma_stop, WD33C93_FS_8_10);
217	error = request_irq(IRQ_AMIGA_PORTS, a2091_intr, IRQF_SHARED,
218			    "A2091 SCSI", instance);
219	if (error)
220		goto fail_irq;
221
222	regs->CNTR = CNTR_PDMD | CNTR_INTEN;
223
224	error = scsi_add_host(instance, NULL);
225	if (error)
226		goto fail_host;
227
228	zorro_set_drvdata(z, instance);
229
230	scsi_scan_host(instance);
231	return 0;
232
233fail_host:
234	free_irq(IRQ_AMIGA_PORTS, instance);
235fail_irq:
236	scsi_host_put(instance);
237fail_alloc:
238	release_mem_region(z->resource.start, 256);
239	return error;
240}
241
242static void a2091_remove(struct zorro_dev *z)
243{
244	struct Scsi_Host *instance = zorro_get_drvdata(z);
245	struct a2091_hostdata *hdata = shost_priv(instance);
246
247	hdata->regs->CNTR = 0;
248	scsi_remove_host(instance);
249	free_irq(IRQ_AMIGA_PORTS, instance);
250	scsi_host_put(instance);
251	release_mem_region(z->resource.start, 256);
252}
253
254static struct zorro_device_id a2091_zorro_tbl[] = {
255	{ ZORRO_PROD_CBM_A590_A2091_1 },
256	{ ZORRO_PROD_CBM_A590_A2091_2 },
257	{ 0 }
258};
259MODULE_DEVICE_TABLE(zorro, a2091_zorro_tbl);
260
261static struct zorro_driver a2091_driver = {
262	.name		= "a2091",
263	.id_table	= a2091_zorro_tbl,
264	.probe		= a2091_probe,
265	.remove		= a2091_remove,
266};
267
268static int __init a2091_init(void)
269{
270	return zorro_register_driver(&a2091_driver);
271}
272module_init(a2091_init);
273
274static void __exit a2091_exit(void)
275{
276	zorro_unregister_driver(&a2091_driver);
277}
278module_exit(a2091_exit);
279
280MODULE_DESCRIPTION("Commodore A2091/A590 SCSI");
281MODULE_LICENSE("GPL");
282