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Arnaud Patard (Rtp)e39c75c2011-07-26 16:58:19 +02001/*
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 */
Sascha Hauer51b55392013-04-04 11:25:06 +020040 void __iomem *host_regs;
Arnaud Patard (Rtp)e39c75c2011-07-26 16:58:19 +020041 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
Wei Yongjun22c8be32012-12-03 23:38:58 -050063 ata_dev_info(dev, "configured for PIO\n");
Arnaud Patard (Rtp)e39c75c2011-07-26 16:58:19 +020064 }
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
Greg Kroah-Hartman0ec24912012-12-21 13:19:58 -080094static int pata_imx_probe(struct platform_device *pdev)
Arnaud Patard (Rtp)e39c75c2011-07-26 16:58:19 +020095{
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;
Sascha Hauerff540d02013-04-04 11:25:05 +0200101 int ret;
Arnaud Patard (Rtp)e39c75c2011-07-26 16:58:19 +0200102
103 io_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
104 if (io_res == NULL)
105 return -EINVAL;
106
107 irq = platform_get_irq(pdev, 0);
108 if (irq <= 0)
109 return -EINVAL;
110
111 priv = devm_kzalloc(&pdev->dev,
112 sizeof(struct pata_imx_priv), GFP_KERNEL);
113 if (!priv)
114 return -ENOMEM;
115
Sascha Hauer50f5a342013-04-04 11:25:04 +0200116 priv->clk = devm_clk_get(&pdev->dev, NULL);
Arnaud Patard (Rtp)e39c75c2011-07-26 16:58:19 +0200117 if (IS_ERR(priv->clk)) {
118 dev_err(&pdev->dev, "Failed to get clock\n");
119 return PTR_ERR(priv->clk);
120 }
121
Fabio Estevama18dada2012-07-07 19:34:05 -0300122 clk_prepare_enable(priv->clk);
Arnaud Patard (Rtp)e39c75c2011-07-26 16:58:19 +0200123
124 host = ata_host_alloc(&pdev->dev, 1);
Sascha Hauerff540d02013-04-04 11:25:05 +0200125 if (!host) {
126 ret = -ENOMEM;
127 goto err;
128 }
Arnaud Patard (Rtp)e39c75c2011-07-26 16:58:19 +0200129
130 host->private_data = priv;
131 ap = host->ports[0];
132
133 ap->ops = &pata_imx_port_ops;
134 ap->pio_mask = ATA_PIO0;
135 ap->flags |= ATA_FLAG_SLAVE_POSS;
136
137 priv->host_regs = devm_ioremap(&pdev->dev, io_res->start,
138 resource_size(io_res));
139 if (!priv->host_regs) {
140 dev_err(&pdev->dev, "failed to map IO/CTL base\n");
Sascha Hauerff540d02013-04-04 11:25:05 +0200141 ret = -EBUSY;
142 goto err;
Arnaud Patard (Rtp)e39c75c2011-07-26 16:58:19 +0200143 }
144
145 ap->ioaddr.cmd_addr = priv->host_regs + PATA_IMX_DRIVE_DATA;
146 ap->ioaddr.ctl_addr = priv->host_regs + PATA_IMX_DRIVE_CONTROL;
147
148 ap->ioaddr.altstatus_addr = ap->ioaddr.ctl_addr;
149
150 pata_imx_setup_port(&ap->ioaddr);
151
152 ata_port_desc(ap, "cmd 0x%llx ctl 0x%llx",
153 (unsigned long long)io_res->start + PATA_IMX_DRIVE_DATA,
154 (unsigned long long)io_res->start + PATA_IMX_DRIVE_CONTROL);
155
156 /* deassert resets */
157 __raw_writel(PATA_IMX_ATA_CTRL_FIFO_RST_B |
158 PATA_IMX_ATA_CTRL_ATA_RST_B,
159 priv->host_regs + PATA_IMX_ATA_CONTROL);
160 /* enable interrupts */
161 __raw_writel(PATA_IMX_ATA_INTR_ATA_INTRQ2,
162 priv->host_regs + PATA_IMX_ATA_INT_EN);
163
164 /* activate */
Sascha Hauerff540d02013-04-04 11:25:05 +0200165 ret = ata_host_activate(host, irq, ata_sff_interrupt, 0,
Arnaud Patard (Rtp)e39c75c2011-07-26 16:58:19 +0200166 &pata_imx_sht);
167
Sascha Hauerff540d02013-04-04 11:25:05 +0200168 if (ret)
169 goto err;
170
171 return 0;
172err:
Fabio Estevama18dada2012-07-07 19:34:05 -0300173 clk_disable_unprepare(priv->clk);
Sascha Hauer50f5a342013-04-04 11:25:04 +0200174
Sascha Hauerff540d02013-04-04 11:25:05 +0200175 return ret;
Arnaud Patard (Rtp)e39c75c2011-07-26 16:58:19 +0200176}
177
Greg Kroah-Hartman0ec24912012-12-21 13:19:58 -0800178static int pata_imx_remove(struct platform_device *pdev)
Arnaud Patard (Rtp)e39c75c2011-07-26 16:58:19 +0200179{
Jingoo Hand89995d2013-05-23 19:41:21 +0900180 struct ata_host *host = platform_get_drvdata(pdev);
Arnaud Patard (Rtp)e39c75c2011-07-26 16:58:19 +0200181 struct pata_imx_priv *priv = host->private_data;
182
183 ata_host_detach(host);
184
185 __raw_writel(0, priv->host_regs + PATA_IMX_ATA_INT_EN);
186
Fabio Estevama18dada2012-07-07 19:34:05 -0300187 clk_disable_unprepare(priv->clk);
Arnaud Patard (Rtp)e39c75c2011-07-26 16:58:19 +0200188
189 return 0;
190}
191
192#ifdef CONFIG_PM
193static int pata_imx_suspend(struct device *dev)
194{
195 struct ata_host *host = dev_get_drvdata(dev);
196 struct pata_imx_priv *priv = host->private_data;
197 int ret;
198
199 ret = ata_host_suspend(host, PMSG_SUSPEND);
200 if (!ret) {
201 __raw_writel(0, priv->host_regs + PATA_IMX_ATA_INT_EN);
202 priv->ata_ctl =
203 __raw_readl(priv->host_regs + PATA_IMX_ATA_CONTROL);
Fabio Estevama18dada2012-07-07 19:34:05 -0300204 clk_disable_unprepare(priv->clk);
Arnaud Patard (Rtp)e39c75c2011-07-26 16:58:19 +0200205 }
206
207 return ret;
208}
209
210static int pata_imx_resume(struct device *dev)
211{
212 struct ata_host *host = dev_get_drvdata(dev);
213 struct pata_imx_priv *priv = host->private_data;
214
Fabio Estevama18dada2012-07-07 19:34:05 -0300215 clk_prepare_enable(priv->clk);
Arnaud Patard (Rtp)e39c75c2011-07-26 16:58:19 +0200216
217 __raw_writel(priv->ata_ctl, priv->host_regs + PATA_IMX_ATA_CONTROL);
218
219 __raw_writel(PATA_IMX_ATA_INTR_ATA_INTRQ2,
220 priv->host_regs + PATA_IMX_ATA_INT_EN);
221
222 ata_host_resume(host);
223
224 return 0;
225}
226
227static const struct dev_pm_ops pata_imx_pm_ops = {
228 .suspend = pata_imx_suspend,
229 .resume = pata_imx_resume,
230};
231#endif
232
Sascha Hauerb9d15db2013-04-04 11:25:07 +0200233static const struct of_device_id imx_pata_dt_ids[] = {
234 {
235 .compatible = "fsl,imx27-pata",
236 }, {
237 /* sentinel */
238 }
239};
Niels de Vos71ab1d52013-07-29 09:38:38 +0200240MODULE_DEVICE_TABLE(of, imx_pata_dt_ids);
Sascha Hauerb9d15db2013-04-04 11:25:07 +0200241
Arnaud Patard (Rtp)e39c75c2011-07-26 16:58:19 +0200242static struct platform_driver pata_imx_driver = {
243 .probe = pata_imx_probe,
Greg Kroah-Hartman0ec24912012-12-21 13:19:58 -0800244 .remove = pata_imx_remove,
Arnaud Patard (Rtp)e39c75c2011-07-26 16:58:19 +0200245 .driver = {
246 .name = DRV_NAME,
Sascha Hauerb9d15db2013-04-04 11:25:07 +0200247 .of_match_table = imx_pata_dt_ids,
Arnaud Patard (Rtp)e39c75c2011-07-26 16:58:19 +0200248 .owner = THIS_MODULE,
249#ifdef CONFIG_PM
250 .pm = &pata_imx_pm_ops,
251#endif
252 },
253};
254
Axel Lin99c8ea32011-11-27 14:44:26 +0800255module_platform_driver(pata_imx_driver);
Arnaud Patard (Rtp)e39c75c2011-07-26 16:58:19 +0200256
257MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>");
258MODULE_DESCRIPTION("low-level driver for iMX PATA");
259MODULE_LICENSE("GPL");
260MODULE_ALIAS("platform:" DRV_NAME);