aboutsummaryrefslogtreecommitdiff
path: root/drivers/ata/pata_at32.c
blob: 8d493b4a0961985347feb48f990075233578c893 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
/*
 * AVR32 SMC/CFC PATA Driver
 *
 * Copyright (C) 2007 Atmel Norway
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License version
 * 2 as published by the Free Software Foundation.
 */

#define DEBUG

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/slab.h>
#include <scsi/scsi_host.h>
#include <linux/ata.h>
#include <linux/libata.h>
#include <linux/err.h>
#include <linux/io.h>

#include <mach/board.h>
#include <mach/smc.h>

#define DRV_NAME "pata_at32"
#define DRV_VERSION "0.0.3"

/*
 * CompactFlash controller memory layout relative to the base address:
 *
 *	Attribute memory:  0000 0000 -> 003f ffff
 *	Common memory:	   0040 0000 -> 007f ffff
 *	I/O memory:	   0080 0000 -> 00bf ffff
 *	True IDE Mode:	   00c0 0000 -> 00df ffff
 *	Alt IDE Mode:	   00e0 0000 -> 00ff ffff
 *
 * Only True IDE and Alt True IDE mode are needed for this driver.
 *
 *	True IDE mode	  => CS0 = 0, CS1 = 1 (cmd, error, stat, etc)
 *	Alt True IDE mode => CS0 = 1, CS1 = 0 (ctl, alt_stat)
 */
#define CF_IDE_OFFSET	  0x00c00000
#define CF_ALT_IDE_OFFSET 0x00e00000
#define CF_RES_SIZE	  2048

/*
 * Define DEBUG_BUS if you are doing debugging of your own EBI -> PATA
 * adaptor with a logic analyzer or similar.
 */
#undef DEBUG_BUS

/*
 * ATA PIO modes
 *
 *	Name	| Mb/s	| Min cycle time | Mask
 *	--------+-------+----------------+--------
 *	Mode 0	| 3.3	| 600 ns	 | 0x01
 *	Mode 1	| 5.2	| 383 ns	 | 0x03
 *	Mode 2	| 8.3	| 240 ns	 | 0x07
 *	Mode 3	| 11.1	| 180 ns	 | 0x0f
 *	Mode 4	| 16.7	| 120 ns	 | 0x1f
 *
 * Alter PIO_MASK below according to table to set maximal PIO mode.
 */
enum {
  PIO_MASK = ATA_PIO4,
};

/*
 * Struct containing private information about device.
 */
struct at32_ide_info {
	unsigned int		irq;
	struct resource		res_ide;
	struct resource		res_alt;
	void __iomem		*ide_addr;
	void __iomem		*alt_addr;
	unsigned int		cs;
	struct smc_config	smc;
};

/*
 * Setup SMC for the given ATA timing.
 */
static int pata_at32_setup_timing(struct device *dev,
				  struct at32_ide_info *info,
				  const struct ata_timing *ata)
{
	struct smc_config *smc = &info->smc;
	struct smc_timing timing;

	int active;
	int recover;

	memset(&timing, 0, sizeof(struct smc_timing));

	/* Total cycle time */
	timing.read_cycle  = ata->cyc8b;

	/* DIOR <= CFIOR timings */
	timing.nrd_setup   = ata->setup;
	timing.nrd_pulse   = ata->act8b;
	timing.nrd_recover = ata->rec8b;

	/* Convert nanosecond timing to clock cycles */
	smc_set_timing(smc, &timing);

	/* Add one extra cycle setup due to signal ring */
	smc->nrd_setup = smc->nrd_setup + 1;

	active  = smc->nrd_setup + smc->nrd_pulse;
	recover = smc->read_cycle - active;

	/* Need at least two cycles recovery */
	if (recover < 2)
	  smc->read_cycle = active + 2;

	/* (CS0, CS1, DIR, OE) <= (CFCE1, CFCE2, CFRNW, NCSX) timings */
	smc->ncs_read_setup = 1;
	smc->ncs_read_pulse = smc->read_cycle - 2;

	/* Write timings same as read timings */
	smc->write_cycle = smc->read_cycle;
	smc->nwe_setup = smc->nrd_setup;
	smc->nwe_pulse = smc->nrd_pulse;
	smc->ncs_write_setup = smc->ncs_read_setup;
	smc->ncs_write_pulse = smc->ncs_read_pulse;

	/* Do some debugging output of ATA and SMC timings */
	dev_dbg(dev, "ATA: C=%d S=%d P=%d R=%d\n",
		ata->cyc8b, ata->setup, ata->act8b, ata->rec8b);

	dev_dbg(dev, "SMC: C=%d S=%d P=%d NS=%d NP=%d\n",
		smc->read_cycle, smc->nrd_setup, smc->nrd_pulse,
		smc->ncs_read_setup, smc->ncs_read_pulse);

	/* Finally, configure the SMC */
	return smc_set_configuration(info->cs, smc);
}

/*
 * Procedures for libATA.
 */
static void pata_at32_set_piomode(struct ata_port *ap, struct ata_device *adev)
{
	struct ata_timing timing;
	struct at32_ide_info *info = ap->host->private_data;

	int ret;

	/* Compute ATA timing */
	ret = ata_timing_compute(adev, adev->pio_mode, &timing, 1000, 0);
	if (ret) {
		dev_warn(ap->dev, "Failed to compute ATA timing %d\n", ret);
		return;
	}

	/* Setup SMC to ATA timing */
	ret = pata_at32_setup_timing(ap->dev, info, &timing);
	if (ret) {
		dev_warn(ap->dev, "Failed to setup ATA timing %d\n", ret);
		return;
	}
}

static struct scsi_host_template at32_sht = {
	ATA_PIO_SHT(DRV_NAME),
};

static struct ata_port_operations at32_port_ops = {
	.inherits		= &ata_sff_port_ops,
	.cable_detect		= ata_cable_40wire,
	.set_piomode		= pata_at32_set_piomode,
};

static int __init pata_at32_init_one(struct device *dev,
				     struct at32_ide_info *info)
{
	struct ata_host *host;
	struct ata_port *ap;

	host = ata_host_alloc(dev, 1);
	if (!host)
		return -ENOMEM;

	ap = host->ports[0];

	/* Setup ATA bindings */
	ap->ops	     = &at32_port_ops;
	ap->pio_mask = PIO_MASK;
	ap->flags   |= ATA_FLAG_SLAVE_POSS;

	/*
	 * Since all 8-bit taskfile transfers has to go on the lower
	 * byte of the data bus and there is a bug in the SMC that
	 * makes it impossible to alter the bus width during runtime,
	 * we need to hardwire the address signals as follows:
	 *
	 *	A_IDE(2:0) <= A_EBI(3:1)
	 *
	 * This makes all addresses on the EBI even, thus all data
	 * will be on the lower byte of the data bus.  All addresses
	 * used by libATA need to be altered according to this.
	 */
	ap->ioaddr.altstatus_addr = info->alt_addr + (0x06 << 1);
	ap->ioaddr.ctl_addr	  = info->alt_addr + (0x06 << 1);

	ap->ioaddr.data_addr	  = info->ide_addr + (ATA_REG_DATA << 1);
	ap->ioaddr.error_addr	  = info->ide_addr + (ATA_REG_ERR << 1);
	ap->ioaddr.feature_addr	  = info->ide_addr + (ATA_REG_FEATURE << 1);
	ap->ioaddr.nsect_addr	  = info->ide_addr + (ATA_REG_NSECT << 1);
	ap->ioaddr.lbal_addr	  = info->ide_addr + (ATA_REG_LBAL << 1);
	ap->ioaddr.lbam_addr	  = info->ide_addr + (ATA_REG_LBAM << 1);
	ap->ioaddr.lbah_addr	  = info->ide_addr + (ATA_REG_LBAH << 1);
	ap->ioaddr.device_addr	  = info->ide_addr + (ATA_REG_DEVICE << 1);
	ap->ioaddr.status_addr	  = info->ide_addr + (ATA_REG_STATUS << 1);
	ap->ioaddr.command_addr	  = info->ide_addr + (ATA_REG_CMD << 1);

	/* Set info as private data of ATA host */
	host->private_data = info;

	/* Register ATA device and return */
	return ata_host_activate(host, info->irq, ata_sff_interrupt,
				 IRQF_SHARED | IRQF_TRIGGER_RISING,
				 &at32_sht);
}

/*
 * This function may come in handy for people analyzing their own
 * EBI -> PATA adaptors.
 */
#ifdef DEBUG_BUS

static void __init pata_at32_debug_bus(struct device *dev,
				       struct at32_ide_info *info)
{
	const int d1 = 0xff;
	const int d2 = 0x00;

	int i;

	/* Write 8-bit values (registers) */
	iowrite8(d1, info->alt_addr + (0x06 << 1));
	iowrite8(d2, info->alt_addr + (0x06 << 1));

	for (i = 0; i < 8; i++) {
		iowrite8(d1, info->ide_addr + (i << 1));
		iowrite8(d2, info->ide_addr + (i << 1));
	}

	/* Write 16 bit values (data) */
	iowrite16(d1,	   info->ide_addr);
	iowrite16(d1 << 8, info->ide_addr);

	iowrite16(d1,	   info->ide_addr);
	iowrite16(d1 << 8, info->ide_addr);
}

#endif

static int __init pata_at32_probe(struct platform_device *pdev)
{
	const struct ata_timing initial_timing =
		{XFER_PIO_0, 70, 290, 240, 600, 165, 150, 600, 0};

	struct device		 *dev = &pdev->dev;
	struct at32_ide_info	 *info;
	struct ide_platform_data *board = pdev->dev.platform_data;
	struct resource		 *res;

	int irq;
	int ret;

	if (!board)
		return -ENXIO;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res)
		return -ENXIO;

	/* Retrive IRQ */
	irq = platform_get_irq(pdev, 0);
	if (irq < 0)
		return irq;

	/* Setup struct containing private information */
	info = kzalloc(sizeof(struct at32_ide_info), GFP_KERNEL);
	if (!info)
		return -ENOMEM;

	info->irq = irq;
	info->cs  = board->cs;

	/* Request memory resources */
	info->res_ide.start = res->start + CF_IDE_OFFSET;
	info->res_ide.end   = info->res_ide.start + CF_RES_SIZE - 1;
	info->res_ide.name  = "ide";
	info->res_ide.flags = IORESOURCE_MEM;

	ret = request_resource(res, &info->res_ide);
	if (ret)
		goto err_req_res_ide;

	info->res_alt.start = res->start + CF_ALT_IDE_OFFSET;
	info->res_alt.end   = info->res_alt.start + CF_RES_SIZE - 1;
	info->res_alt.name  = "alt";
	info->res_alt.flags = IORESOURCE_MEM;

	ret = request_resource(res, &info->res_alt);
	if (ret)
		goto err_req_res_alt;

	/* Setup non-timing elements of SMC */
	info->smc.bus_width	 = 2; /* 16 bit data bus */
	info->smc.nrd_controlled = 1; /* Sample data on rising edge of NRD */
	info->smc.nwe_controlled = 0; /* Drive data on falling edge of NCS */
	info->smc.nwait_mode	 = 3; /* NWAIT is in READY mode */
	info->smc.byte_write	 = 0; /* Byte select access type */
	info->smc.tdf_mode	 = 0; /* TDF optimization disabled */
	info->smc.tdf_cycles	 = 0; /* No TDF wait cycles */

	/* Setup SMC to ATA timing */
	ret = pata_at32_setup_timing(dev, info, &initial_timing);
	if (ret)
		goto err_setup_timing;

	/* Map ATA address space */
	ret = -ENOMEM;
	info->ide_addr = devm_ioremap(dev, info->res_ide.start, 16);
	info->alt_addr = devm_ioremap(dev, info->res_alt.start, 16);
	if (!info->ide_addr || !info->alt_addr)
		goto err_ioremap;

#ifdef DEBUG_BUS
	pata_at32_debug_bus(dev, info);
#endif

	/* Setup and register ATA device */
	ret = pata_at32_init_one(dev, info);
	if (ret)
		goto err_ata_device;

	return 0;

 err_ata_device:
 err_ioremap:
 err_setup_timing:
	release_resource(&info->res_alt);
 err_req_res_alt:
	release_resource(&info->res_ide);
 err_req_res_ide:
	kfree(info);

	return ret;
}

static int __exit pata_at32_remove(struct platform_device *pdev)
{
	struct ata_host *host = platform_get_drvdata(pdev);
	struct at32_ide_info *info;

	if (!host)
		return 0;

	info = host->private_data;
	ata_host_detach(host);

	if (!info)
		return 0;

	release_resource(&info->res_ide);
	release_resource(&info->res_alt);

	kfree(info);

	return 0;
}

/* work with hotplug and coldplug */
MODULE_ALIAS("platform:at32_ide");

static struct platform_driver pata_at32_driver = {
	.remove	       = __exit_p(pata_at32_remove),
	.driver	       = {
		.name  = "at32_ide",
		.owner = THIS_MODULE,
	},
};

module_platform_driver_probe(pata_at32_driver, pata_at32_probe);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("AVR32 SMC/CFC PATA Driver");
MODULE_AUTHOR("Kristoffer Nyborg Gregertsen <kngregertsen@norway.atmel.com>");
MODULE_VERSION(DRV_VERSION);