summaryrefslogtreecommitdiffstats
path: root/drivers/ata/pata_winbond.c
blob: cc18231e933420b2f6d5dc4a0ef4a5d08e9557f4 (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
/*
 *    pata_winbond.c - Winbond VLB ATA controllers
 *	(C) 2006 Red Hat <alan@redhat.com>
 *
 *    Support for the Winbond 83759A when operating in advanced mode.
 *    Multichip mode is not currently supported.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/blkdev.h>
#include <linux/delay.h>
#include <scsi/scsi_host.h>
#include <linux/libata.h>
#include <linux/platform_device.h>

#define DRV_NAME "pata_winbond"
#define DRV_VERSION "0.0.3"

#define NR_HOST 4	/* Two winbond controllers, two channels each */

struct winbond_data {
	unsigned long config;
	struct platform_device *platform_dev;
};

static struct ata_host *winbond_host[NR_HOST];
static struct winbond_data winbond_data[NR_HOST];
static int nr_winbond_host;

#ifdef MODULE
static int probe_winbond = 1;
#else
static int probe_winbond;
#endif

static DEFINE_SPINLOCK(winbond_lock);

static void winbond_writecfg(unsigned long port, u8 reg, u8 val)
{
	unsigned long flags;
	spin_lock_irqsave(&winbond_lock, flags);
	outb(reg, port + 0x01);
	outb(val, port + 0x02);
	spin_unlock_irqrestore(&winbond_lock, flags);
}

static u8 winbond_readcfg(unsigned long port, u8 reg)
{
	u8 val;

	unsigned long flags;
	spin_lock_irqsave(&winbond_lock, flags);
	outb(reg, port + 0x01);
	val = inb(port + 0x02);
	spin_unlock_irqrestore(&winbond_lock, flags);

	return val;
}

static void winbond_set_piomode(struct ata_port *ap, struct ata_device *adev)
{
	struct ata_timing t;
	struct winbond_data *winbond = ap->host->private_data;
	int active, recovery;
	u8 reg;
	int timing = 0x88 + (ap->port_no * 4) + (adev->devno * 2);

	reg = winbond_readcfg(winbond->config, 0x81);

	/* Get the timing data in cycles */
	if (reg & 0x40)		/* Fast VLB bus, assume 50MHz */
		ata_timing_compute(adev, adev->pio_mode, &t, 20000, 1000);
	else
		ata_timing_compute(adev, adev->pio_mode, &t, 30303, 1000);

	active = (FIT(t.active, 3, 17) - 1) & 0x0F;
	recovery = (FIT(t.recover, 1, 15) + 1) & 0x0F;
	timing = (active << 4) | recovery;
	winbond_writecfg(winbond->config, timing, reg);

	/* Load the setup timing */

	reg = 0x35;
	if (adev->class != ATA_DEV_ATA)
		reg |= 0x08;	/* FIFO off */
	if (!ata_pio_need_iordy(adev))
		reg |= 0x02;	/* IORDY off */
	reg |= (FIT(t.setup, 0, 3) << 6);
	winbond_writecfg(winbond->config, timing + 1, reg);
}


static unsigned int winbond_data_xfer(struct ata_device *dev,
			unsigned char *buf, unsigned int buflen, int rw)
{
	struct ata_port *ap = dev->link->ap;
	int slop = buflen & 3;

	if (ata_id_has_dword_io(dev->id)) {
		if (rw == READ)
			ioread32_rep(ap->ioaddr.data_addr, buf, buflen >> 2);
		else
			iowrite32_rep(ap->ioaddr.data_addr, buf, buflen >> 2);

		if (unlikely(slop)) {
			u32 pad;
			if (rw == READ) {
				pad = cpu_to_le32(ioread32(ap->ioaddr.data_addr));
				memcpy(buf + buflen - slop, &pad, slop);
			} else {
				memcpy(&pad, buf + buflen - slop, slop);
				iowrite32(le32_to_cpu(pad), ap->ioaddr.data_addr);
			}
			buflen += 4 - slop;
		}
	} else
		buflen = ata_sff_data_xfer(dev, buf, buflen, rw);

	return buflen;
}

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

static struct ata_port_operations winbond_port_ops = {
	.inherits	= &ata_sff_port_ops,
	.data_xfer	= winbond_data_xfer,
	.cable_detect	= ata_cable_40wire,
	.set_piomode	= winbond_set_piomode,
};

/**
 *	winbond_init_one		-	attach a winbond interface
 *	@type: Type to display
 *	@io: I/O port start
 *	@irq: interrupt line
 *	@fast: True if on a > 33Mhz VLB
 *
 *	Register a VLB bus IDE interface. Such interfaces are PIO and we
 *	assume do not support IRQ sharing.
 */

static __init int winbond_init_one(unsigned long port)
{
	struct platform_device *pdev;
	u8 reg;
	int i, rc;

	reg = winbond_readcfg(port, 0x81);
	reg |= 0x80;	/* jumpered mode off */
	winbond_writecfg(port, 0x81, reg);
	reg = winbond_readcfg(port, 0x83);
	reg |= 0xF0;	/* local control */
	winbond_writecfg(port, 0x83, reg);
	reg = winbond_readcfg(port, 0x85);
	reg |= 0xF0;	/* programmable timing */
	winbond_writecfg(port, 0x85, reg);

	reg = winbond_readcfg(port, 0x81);

	if (!(reg & 0x03))		/* Disabled */
		return -ENODEV;

	for (i = 0; i < 2 ; i ++) {
		unsigned long cmd_port = 0x1F0 - (0x80 * i);
		unsigned long ctl_port = cmd_port + 0x206;
		struct ata_host *host;
		struct ata_port *ap;
		void __iomem *cmd_addr, *ctl_addr;

		if (!(reg & (1 << i)))
			continue;

		pdev = platform_device_register_simple(DRV_NAME, nr_winbond_host, NULL, 0);
		if (IS_ERR(pdev))
			return PTR_ERR(pdev);

		rc = -ENOMEM;
		host = ata_host_alloc(&pdev->dev, 1);
		if (!host)
			goto err_unregister;
		ap = host->ports[0];

		rc = -ENOMEM;
		cmd_addr = devm_ioport_map(&pdev->dev, cmd_port, 8);
		ctl_addr = devm_ioport_map(&pdev->dev, ctl_port, 1);
		if (!cmd_addr || !ctl_addr)
			goto err_unregister;

		ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx", cmd_port, ctl_port);

		ap->ops = &winbond_port_ops;
		ap->pio_mask = 0x1F;
		ap->flags |= ATA_FLAG_SLAVE_POSS;
		ap->ioaddr.cmd_addr = cmd_addr;
		ap->ioaddr.altstatus_addr = ctl_addr;
		ap->ioaddr.ctl_addr = ctl_addr;
		ata_sff_std_ports(&ap->ioaddr);

		/* hook in a private data structure per channel */
		host->private_data = &winbond_data[nr_winbond_host];
		winbond_data[nr_winbond_host].config = port;
		winbond_data[nr_winbond_host].platform_dev = pdev;

		/* activate */
		rc = ata_host_activate(host, 14 + i, ata_sff_interrupt, 0,
				       &winbond_sht);
		if (rc)
			goto err_unregister;

		winbond_host[nr_winbond_host++] = dev_get_drvdata(&pdev->dev);
	}

	return 0;

 err_unregister:
	platform_device_unregister(pdev);
	return rc;
}

/**
 *	winbond_init		-	attach winbond interfaces
 *
 *	Attach winbond IDE interfaces by scanning the ports it may occupy.
 */

static __init int winbond_init(void)
{
	static const unsigned long config[2] = { 0x130, 0x1B0 };

	int ct = 0;
	int i;

	if (probe_winbond == 0)
		return -ENODEV;

	/*
 	 *	Check both base addresses
	 */

	for (i = 0; i < 2; i++) {
		if (probe_winbond & (1<<i)) {
			int ret = 0;
			unsigned long port = config[i];

			if (request_region(port, 2, "pata_winbond")) {
				ret = winbond_init_one(port);
				if (ret <= 0)
					release_region(port, 2);
				else ct+= ret;
			}
		}
	}
	if (ct != 0)
		return 0;
	return -ENODEV;
}

static __exit void winbond_exit(void)
{
	int i;

	for (i = 0; i < nr_winbond_host; i++) {
		ata_host_detach(winbond_host[i]);
		release_region(winbond_data[i].config, 2);
		platform_device_unregister(winbond_data[i].platform_dev);
	}
}

MODULE_AUTHOR("Alan Cox");
MODULE_DESCRIPTION("low-level driver for Winbond VL ATA");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_VERSION);

module_init(winbond_init);
module_exit(winbond_exit);

module_param(probe_winbond, int, 0);