Loading...
1/*
2 * Freescale iMX PATA driver
3 *
4 * Copyright (C) 2011 Arnaud Patard <arnaud.patard@rtp-net.org>
5 *
6 * Based on pata_platform - Copyright (C) 2006 - 2007 Paul Mundt
7 *
8 * This file is subject to the terms and conditions of the GNU General Public
9 * License. See the file "COPYING" in the main directory of this archive
10 * for more details.
11 *
12 * TODO:
13 * - dmaengine support
14 */
15
16#include <linux/ata.h>
17#include <linux/clk.h>
18#include <linux/libata.h>
19#include <linux/module.h>
20#include <linux/mod_devicetable.h>
21#include <linux/platform_device.h>
22
23#define DRV_NAME "pata_imx"
24
25#define PATA_IMX_ATA_TIME_OFF 0x00
26#define PATA_IMX_ATA_TIME_ON 0x01
27#define PATA_IMX_ATA_TIME_1 0x02
28#define PATA_IMX_ATA_TIME_2W 0x03
29#define PATA_IMX_ATA_TIME_2R 0x04
30#define PATA_IMX_ATA_TIME_AX 0x05
31#define PATA_IMX_ATA_TIME_PIO_RDX 0x06
32#define PATA_IMX_ATA_TIME_4 0x07
33#define PATA_IMX_ATA_TIME_9 0x08
34
35#define PATA_IMX_ATA_CONTROL 0x24
36#define PATA_IMX_ATA_CTRL_FIFO_RST_B (1<<7)
37#define PATA_IMX_ATA_CTRL_ATA_RST_B (1<<6)
38#define PATA_IMX_ATA_CTRL_IORDY_EN (1<<0)
39#define PATA_IMX_ATA_INT_EN 0x2C
40#define PATA_IMX_ATA_INTR_ATA_INTRQ2 (1<<3)
41#define PATA_IMX_DRIVE_DATA 0xA0
42#define PATA_IMX_DRIVE_CONTROL 0xD8
43
44static u32 pio_t4[] = { 30, 20, 15, 10, 10 };
45static u32 pio_t9[] = { 20, 15, 10, 10, 10 };
46static u32 pio_tA[] = { 35, 35, 35, 35, 35 };
47
48struct pata_imx_priv {
49 struct clk *clk;
50 /* timings/interrupt/control regs */
51 void __iomem *host_regs;
52 u32 ata_ctl;
53};
54
55static void pata_imx_set_timing(struct ata_device *adev,
56 struct pata_imx_priv *priv)
57{
58 struct ata_timing timing;
59 unsigned long clkrate;
60 u32 T, mode;
61
62 clkrate = clk_get_rate(priv->clk);
63
64 if (adev->pio_mode < XFER_PIO_0 || adev->pio_mode > XFER_PIO_4 ||
65 !clkrate)
66 return;
67
68 T = 1000000000 / clkrate;
69 ata_timing_compute(adev, adev->pio_mode, &timing, T * 1000, 0);
70
71 mode = adev->pio_mode - XFER_PIO_0;
72
73 writeb(3, priv->host_regs + PATA_IMX_ATA_TIME_OFF);
74 writeb(3, priv->host_regs + PATA_IMX_ATA_TIME_ON);
75 writeb(timing.setup, priv->host_regs + PATA_IMX_ATA_TIME_1);
76 writeb(timing.act8b, priv->host_regs + PATA_IMX_ATA_TIME_2W);
77 writeb(timing.act8b, priv->host_regs + PATA_IMX_ATA_TIME_2R);
78 writeb(1, priv->host_regs + PATA_IMX_ATA_TIME_PIO_RDX);
79
80 writeb(pio_t4[mode] / T + 1, priv->host_regs + PATA_IMX_ATA_TIME_4);
81 writeb(pio_t9[mode] / T + 1, priv->host_regs + PATA_IMX_ATA_TIME_9);
82 writeb(pio_tA[mode] / T + 1, priv->host_regs + PATA_IMX_ATA_TIME_AX);
83}
84
85static void pata_imx_set_piomode(struct ata_port *ap, struct ata_device *adev)
86{
87 struct pata_imx_priv *priv = ap->host->private_data;
88 u32 val;
89
90 pata_imx_set_timing(adev, priv);
91
92 val = __raw_readl(priv->host_regs + PATA_IMX_ATA_CONTROL);
93 if (ata_pio_need_iordy(adev))
94 val |= PATA_IMX_ATA_CTRL_IORDY_EN;
95 else
96 val &= ~PATA_IMX_ATA_CTRL_IORDY_EN;
97 __raw_writel(val, priv->host_regs + PATA_IMX_ATA_CONTROL);
98}
99
100static const struct scsi_host_template pata_imx_sht = {
101 ATA_PIO_SHT(DRV_NAME),
102};
103
104static struct ata_port_operations pata_imx_port_ops = {
105 .inherits = &ata_sff_port_ops,
106 .sff_data_xfer = ata_sff_data_xfer32,
107 .cable_detect = ata_cable_unknown,
108 .set_piomode = pata_imx_set_piomode,
109};
110
111static void pata_imx_setup_port(struct ata_ioports *ioaddr)
112{
113 /* Fixup the port shift for platforms that need it */
114 ioaddr->data_addr = ioaddr->cmd_addr + (ATA_REG_DATA << 2);
115 ioaddr->error_addr = ioaddr->cmd_addr + (ATA_REG_ERR << 2);
116 ioaddr->feature_addr = ioaddr->cmd_addr + (ATA_REG_FEATURE << 2);
117 ioaddr->nsect_addr = ioaddr->cmd_addr + (ATA_REG_NSECT << 2);
118 ioaddr->lbal_addr = ioaddr->cmd_addr + (ATA_REG_LBAL << 2);
119 ioaddr->lbam_addr = ioaddr->cmd_addr + (ATA_REG_LBAM << 2);
120 ioaddr->lbah_addr = ioaddr->cmd_addr + (ATA_REG_LBAH << 2);
121 ioaddr->device_addr = ioaddr->cmd_addr + (ATA_REG_DEVICE << 2);
122 ioaddr->status_addr = ioaddr->cmd_addr + (ATA_REG_STATUS << 2);
123 ioaddr->command_addr = ioaddr->cmd_addr + (ATA_REG_CMD << 2);
124}
125
126static int pata_imx_probe(struct platform_device *pdev)
127{
128 struct ata_host *host;
129 struct ata_port *ap;
130 struct pata_imx_priv *priv;
131 int irq = 0;
132 struct resource *io_res;
133 int ret;
134
135 irq = platform_get_irq(pdev, 0);
136 if (irq < 0)
137 return irq;
138
139 priv = devm_kzalloc(&pdev->dev,
140 sizeof(struct pata_imx_priv), GFP_KERNEL);
141 if (!priv)
142 return -ENOMEM;
143
144 priv->clk = devm_clk_get_enabled(&pdev->dev, NULL);
145 if (IS_ERR(priv->clk)) {
146 dev_err(&pdev->dev, "Failed to get and enable clock\n");
147 return PTR_ERR(priv->clk);
148 }
149
150 host = ata_host_alloc(&pdev->dev, 1);
151 if (!host)
152 return -ENOMEM;
153
154 host->private_data = priv;
155 ap = host->ports[0];
156
157 ap->ops = &pata_imx_port_ops;
158 ap->pio_mask = ATA_PIO4;
159 ap->flags |= ATA_FLAG_SLAVE_POSS;
160
161 priv->host_regs = devm_platform_get_and_ioremap_resource(pdev, 0, &io_res);
162 if (IS_ERR(priv->host_regs))
163 return PTR_ERR(priv->host_regs);
164
165 ap->ioaddr.cmd_addr = priv->host_regs + PATA_IMX_DRIVE_DATA;
166 ap->ioaddr.ctl_addr = priv->host_regs + PATA_IMX_DRIVE_CONTROL;
167
168 ap->ioaddr.altstatus_addr = ap->ioaddr.ctl_addr;
169
170 pata_imx_setup_port(&ap->ioaddr);
171
172 ata_port_desc(ap, "cmd 0x%llx ctl 0x%llx",
173 (unsigned long long)io_res->start + PATA_IMX_DRIVE_DATA,
174 (unsigned long long)io_res->start + PATA_IMX_DRIVE_CONTROL);
175
176 /* deassert resets */
177 __raw_writel(PATA_IMX_ATA_CTRL_FIFO_RST_B |
178 PATA_IMX_ATA_CTRL_ATA_RST_B,
179 priv->host_regs + PATA_IMX_ATA_CONTROL);
180 /* enable interrupts */
181 __raw_writel(PATA_IMX_ATA_INTR_ATA_INTRQ2,
182 priv->host_regs + PATA_IMX_ATA_INT_EN);
183
184 /* activate */
185 ret = ata_host_activate(host, irq, ata_sff_interrupt, 0,
186 &pata_imx_sht);
187
188 if (ret)
189 return ret;
190
191 return 0;
192}
193
194static void pata_imx_remove(struct platform_device *pdev)
195{
196 struct ata_host *host = platform_get_drvdata(pdev);
197 struct pata_imx_priv *priv = host->private_data;
198
199 ata_host_detach(host);
200
201 __raw_writel(0, priv->host_regs + PATA_IMX_ATA_INT_EN);
202}
203
204#ifdef CONFIG_PM_SLEEP
205static int pata_imx_suspend(struct device *dev)
206{
207 struct ata_host *host = dev_get_drvdata(dev);
208 struct pata_imx_priv *priv = host->private_data;
209
210 ata_host_suspend(host, PMSG_SUSPEND);
211
212 __raw_writel(0, priv->host_regs + PATA_IMX_ATA_INT_EN);
213 priv->ata_ctl = __raw_readl(priv->host_regs + PATA_IMX_ATA_CONTROL);
214 clk_disable_unprepare(priv->clk);
215
216 return 0;
217}
218
219static int pata_imx_resume(struct device *dev)
220{
221 struct ata_host *host = dev_get_drvdata(dev);
222 struct pata_imx_priv *priv = host->private_data;
223
224 int ret = clk_prepare_enable(priv->clk);
225 if (ret)
226 return ret;
227
228 __raw_writel(priv->ata_ctl, priv->host_regs + PATA_IMX_ATA_CONTROL);
229
230 __raw_writel(PATA_IMX_ATA_INTR_ATA_INTRQ2,
231 priv->host_regs + PATA_IMX_ATA_INT_EN);
232
233 ata_host_resume(host);
234
235 return 0;
236}
237#endif
238
239static SIMPLE_DEV_PM_OPS(pata_imx_pm_ops, pata_imx_suspend, pata_imx_resume);
240
241static const struct of_device_id imx_pata_dt_ids[] = {
242 {
243 .compatible = "fsl,imx27-pata",
244 }, {
245 /* sentinel */
246 }
247};
248MODULE_DEVICE_TABLE(of, imx_pata_dt_ids);
249
250static struct platform_driver pata_imx_driver = {
251 .probe = pata_imx_probe,
252 .remove_new = pata_imx_remove,
253 .driver = {
254 .name = DRV_NAME,
255 .of_match_table = imx_pata_dt_ids,
256 .pm = &pata_imx_pm_ops,
257 },
258};
259
260module_platform_driver(pata_imx_driver);
261
262MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>");
263MODULE_DESCRIPTION("low-level driver for iMX PATA");
264MODULE_LICENSE("GPL");
265MODULE_ALIAS("platform:" DRV_NAME);
1/*
2 * Freescale iMX PATA driver
3 *
4 * Copyright (C) 2011 Arnaud Patard <arnaud.patard@rtp-net.org>
5 *
6 * Based on pata_platform - Copyright (C) 2006 - 2007 Paul Mundt
7 *
8 * This file is subject to the terms and conditions of the GNU General Public
9 * License. See the file "COPYING" in the main directory of this archive
10 * for more details.
11 *
12 * TODO:
13 * - dmaengine support
14 * - check if timing stuff needed
15 */
16#include <linux/kernel.h>
17#include <linux/module.h>
18#include <linux/init.h>
19#include <linux/blkdev.h>
20#include <scsi/scsi_host.h>
21#include <linux/ata.h>
22#include <linux/libata.h>
23#include <linux/platform_device.h>
24#include <linux/clk.h>
25
26#define DRV_NAME "pata_imx"
27
28#define PATA_IMX_ATA_CONTROL 0x24
29#define PATA_IMX_ATA_CTRL_FIFO_RST_B (1<<7)
30#define PATA_IMX_ATA_CTRL_ATA_RST_B (1<<6)
31#define PATA_IMX_ATA_CTRL_IORDY_EN (1<<0)
32#define PATA_IMX_ATA_INT_EN 0x2C
33#define PATA_IMX_ATA_INTR_ATA_INTRQ2 (1<<3)
34#define PATA_IMX_DRIVE_DATA 0xA0
35#define PATA_IMX_DRIVE_CONTROL 0xD8
36
37struct pata_imx_priv {
38 struct clk *clk;
39 /* timings/interrupt/control regs */
40 u8 *host_regs;
41 u32 ata_ctl;
42};
43
44static int pata_imx_set_mode(struct ata_link *link, struct ata_device **unused)
45{
46 struct ata_device *dev;
47 struct ata_port *ap = link->ap;
48 struct pata_imx_priv *priv = ap->host->private_data;
49 u32 val;
50
51 ata_for_each_dev(dev, link, ENABLED) {
52 dev->pio_mode = dev->xfer_mode = XFER_PIO_0;
53 dev->xfer_shift = ATA_SHIFT_PIO;
54 dev->flags |= ATA_DFLAG_PIO;
55
56 val = __raw_readl(priv->host_regs + PATA_IMX_ATA_CONTROL);
57 if (ata_pio_need_iordy(dev))
58 val |= PATA_IMX_ATA_CTRL_IORDY_EN;
59 else
60 val &= ~PATA_IMX_ATA_CTRL_IORDY_EN;
61 __raw_writel(val, priv->host_regs + PATA_IMX_ATA_CONTROL);
62
63 ata_dev_printk(dev, KERN_INFO, "configured for PIO\n");
64 }
65 return 0;
66}
67
68static struct scsi_host_template pata_imx_sht = {
69 ATA_PIO_SHT(DRV_NAME),
70};
71
72static struct ata_port_operations pata_imx_port_ops = {
73 .inherits = &ata_sff_port_ops,
74 .sff_data_xfer = ata_sff_data_xfer_noirq,
75 .cable_detect = ata_cable_unknown,
76 .set_mode = pata_imx_set_mode,
77};
78
79static void pata_imx_setup_port(struct ata_ioports *ioaddr)
80{
81 /* Fixup the port shift for platforms that need it */
82 ioaddr->data_addr = ioaddr->cmd_addr + (ATA_REG_DATA << 2);
83 ioaddr->error_addr = ioaddr->cmd_addr + (ATA_REG_ERR << 2);
84 ioaddr->feature_addr = ioaddr->cmd_addr + (ATA_REG_FEATURE << 2);
85 ioaddr->nsect_addr = ioaddr->cmd_addr + (ATA_REG_NSECT << 2);
86 ioaddr->lbal_addr = ioaddr->cmd_addr + (ATA_REG_LBAL << 2);
87 ioaddr->lbam_addr = ioaddr->cmd_addr + (ATA_REG_LBAM << 2);
88 ioaddr->lbah_addr = ioaddr->cmd_addr + (ATA_REG_LBAH << 2);
89 ioaddr->device_addr = ioaddr->cmd_addr + (ATA_REG_DEVICE << 2);
90 ioaddr->status_addr = ioaddr->cmd_addr + (ATA_REG_STATUS << 2);
91 ioaddr->command_addr = ioaddr->cmd_addr + (ATA_REG_CMD << 2);
92}
93
94static int __devinit pata_imx_probe(struct platform_device *pdev)
95{
96 struct ata_host *host;
97 struct ata_port *ap;
98 struct pata_imx_priv *priv;
99 int irq = 0;
100 struct resource *io_res;
101
102 io_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
103 if (io_res == NULL)
104 return -EINVAL;
105
106 irq = platform_get_irq(pdev, 0);
107 if (irq <= 0)
108 return -EINVAL;
109
110 priv = devm_kzalloc(&pdev->dev,
111 sizeof(struct pata_imx_priv), GFP_KERNEL);
112 if (!priv)
113 return -ENOMEM;
114
115 priv->clk = clk_get(&pdev->dev, NULL);
116 if (IS_ERR(priv->clk)) {
117 dev_err(&pdev->dev, "Failed to get clock\n");
118 return PTR_ERR(priv->clk);
119 }
120
121 clk_enable(priv->clk);
122
123 host = ata_host_alloc(&pdev->dev, 1);
124 if (!host)
125 goto free_priv;
126
127 host->private_data = priv;
128 ap = host->ports[0];
129
130 ap->ops = &pata_imx_port_ops;
131 ap->pio_mask = ATA_PIO0;
132 ap->flags |= ATA_FLAG_SLAVE_POSS;
133
134 priv->host_regs = devm_ioremap(&pdev->dev, io_res->start,
135 resource_size(io_res));
136 if (!priv->host_regs) {
137 dev_err(&pdev->dev, "failed to map IO/CTL base\n");
138 goto free_priv;
139 }
140
141 ap->ioaddr.cmd_addr = priv->host_regs + PATA_IMX_DRIVE_DATA;
142 ap->ioaddr.ctl_addr = priv->host_regs + PATA_IMX_DRIVE_CONTROL;
143
144 ap->ioaddr.altstatus_addr = ap->ioaddr.ctl_addr;
145
146 pata_imx_setup_port(&ap->ioaddr);
147
148 ata_port_desc(ap, "cmd 0x%llx ctl 0x%llx",
149 (unsigned long long)io_res->start + PATA_IMX_DRIVE_DATA,
150 (unsigned long long)io_res->start + PATA_IMX_DRIVE_CONTROL);
151
152 /* deassert resets */
153 __raw_writel(PATA_IMX_ATA_CTRL_FIFO_RST_B |
154 PATA_IMX_ATA_CTRL_ATA_RST_B,
155 priv->host_regs + PATA_IMX_ATA_CONTROL);
156 /* enable interrupts */
157 __raw_writel(PATA_IMX_ATA_INTR_ATA_INTRQ2,
158 priv->host_regs + PATA_IMX_ATA_INT_EN);
159
160 /* activate */
161 return ata_host_activate(host, irq, ata_sff_interrupt, 0,
162 &pata_imx_sht);
163
164free_priv:
165 clk_disable(priv->clk);
166 clk_put(priv->clk);
167 return -ENOMEM;
168}
169
170static int __devexit pata_imx_remove(struct platform_device *pdev)
171{
172 struct ata_host *host = dev_get_drvdata(&pdev->dev);
173 struct pata_imx_priv *priv = host->private_data;
174
175 ata_host_detach(host);
176
177 __raw_writel(0, priv->host_regs + PATA_IMX_ATA_INT_EN);
178
179 clk_disable(priv->clk);
180 clk_put(priv->clk);
181
182 return 0;
183}
184
185#ifdef CONFIG_PM
186static int pata_imx_suspend(struct device *dev)
187{
188 struct ata_host *host = dev_get_drvdata(dev);
189 struct pata_imx_priv *priv = host->private_data;
190 int ret;
191
192 ret = ata_host_suspend(host, PMSG_SUSPEND);
193 if (!ret) {
194 __raw_writel(0, priv->host_regs + PATA_IMX_ATA_INT_EN);
195 priv->ata_ctl =
196 __raw_readl(priv->host_regs + PATA_IMX_ATA_CONTROL);
197 clk_disable(priv->clk);
198 }
199
200 return ret;
201}
202
203static int pata_imx_resume(struct device *dev)
204{
205 struct ata_host *host = dev_get_drvdata(dev);
206 struct pata_imx_priv *priv = host->private_data;
207
208 clk_enable(priv->clk);
209
210 __raw_writel(priv->ata_ctl, priv->host_regs + PATA_IMX_ATA_CONTROL);
211
212 __raw_writel(PATA_IMX_ATA_INTR_ATA_INTRQ2,
213 priv->host_regs + PATA_IMX_ATA_INT_EN);
214
215 ata_host_resume(host);
216
217 return 0;
218}
219
220static const struct dev_pm_ops pata_imx_pm_ops = {
221 .suspend = pata_imx_suspend,
222 .resume = pata_imx_resume,
223};
224#endif
225
226static struct platform_driver pata_imx_driver = {
227 .probe = pata_imx_probe,
228 .remove = __devexit_p(pata_imx_remove),
229 .driver = {
230 .name = DRV_NAME,
231 .owner = THIS_MODULE,
232#ifdef CONFIG_PM
233 .pm = &pata_imx_pm_ops,
234#endif
235 },
236};
237
238static int __init pata_imx_init(void)
239{
240 return platform_driver_register(&pata_imx_driver);
241}
242
243static void __exit pata_imx_exit(void)
244{
245 platform_driver_unregister(&pata_imx_driver);
246}
247module_init(pata_imx_init);
248module_exit(pata_imx_exit);
249
250MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>");
251MODULE_DESCRIPTION("low-level driver for iMX PATA");
252MODULE_LICENSE("GPL");
253MODULE_ALIAS("platform:" DRV_NAME);