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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>
Arnaud Patard (Rtp)e39c75c2011-07-26 16:58:19 +020018#include <linux/blkdev.h>
19#include <scsi/scsi_host.h>
20#include <linux/ata.h>
21#include <linux/libata.h>
22#include <linux/platform_device.h>
23#include <linux/clk.h>
24
25#define DRV_NAME "pata_imx"
26
27#define PATA_IMX_ATA_CONTROL 0x24
28#define PATA_IMX_ATA_CTRL_FIFO_RST_B (1<<7)
29#define PATA_IMX_ATA_CTRL_ATA_RST_B (1<<6)
30#define PATA_IMX_ATA_CTRL_IORDY_EN (1<<0)
31#define PATA_IMX_ATA_INT_EN 0x2C
32#define PATA_IMX_ATA_INTR_ATA_INTRQ2 (1<<3)
33#define PATA_IMX_DRIVE_DATA 0xA0
34#define PATA_IMX_DRIVE_CONTROL 0xD8
35
36struct pata_imx_priv {
37 struct clk *clk;
38 /* timings/interrupt/control regs */
Sascha Hauer51b55392013-04-04 11:25:06 +020039 void __iomem *host_regs;
Arnaud Patard (Rtp)e39c75c2011-07-26 16:58:19 +020040 u32 ata_ctl;
41};
42
43static int pata_imx_set_mode(struct ata_link *link, struct ata_device **unused)
44{
45 struct ata_device *dev;
46 struct ata_port *ap = link->ap;
47 struct pata_imx_priv *priv = ap->host->private_data;
48 u32 val;
49
50 ata_for_each_dev(dev, link, ENABLED) {
51 dev->pio_mode = dev->xfer_mode = XFER_PIO_0;
52 dev->xfer_shift = ATA_SHIFT_PIO;
53 dev->flags |= ATA_DFLAG_PIO;
54
55 val = __raw_readl(priv->host_regs + PATA_IMX_ATA_CONTROL);
56 if (ata_pio_need_iordy(dev))
57 val |= PATA_IMX_ATA_CTRL_IORDY_EN;
58 else
59 val &= ~PATA_IMX_ATA_CTRL_IORDY_EN;
60 __raw_writel(val, priv->host_regs + PATA_IMX_ATA_CONTROL);
61
Wei Yongjun22c8be32012-12-03 23:38:58 -050062 ata_dev_info(dev, "configured for PIO\n");
Arnaud Patard (Rtp)e39c75c2011-07-26 16:58:19 +020063 }
64 return 0;
65}
66
67static struct scsi_host_template pata_imx_sht = {
68 ATA_PIO_SHT(DRV_NAME),
69};
70
71static struct ata_port_operations pata_imx_port_ops = {
72 .inherits = &ata_sff_port_ops,
73 .sff_data_xfer = ata_sff_data_xfer_noirq,
74 .cable_detect = ata_cable_unknown,
75 .set_mode = pata_imx_set_mode,
76};
77
78static void pata_imx_setup_port(struct ata_ioports *ioaddr)
79{
80 /* Fixup the port shift for platforms that need it */
81 ioaddr->data_addr = ioaddr->cmd_addr + (ATA_REG_DATA << 2);
82 ioaddr->error_addr = ioaddr->cmd_addr + (ATA_REG_ERR << 2);
83 ioaddr->feature_addr = ioaddr->cmd_addr + (ATA_REG_FEATURE << 2);
84 ioaddr->nsect_addr = ioaddr->cmd_addr + (ATA_REG_NSECT << 2);
85 ioaddr->lbal_addr = ioaddr->cmd_addr + (ATA_REG_LBAL << 2);
86 ioaddr->lbam_addr = ioaddr->cmd_addr + (ATA_REG_LBAM << 2);
87 ioaddr->lbah_addr = ioaddr->cmd_addr + (ATA_REG_LBAH << 2);
88 ioaddr->device_addr = ioaddr->cmd_addr + (ATA_REG_DEVICE << 2);
89 ioaddr->status_addr = ioaddr->cmd_addr + (ATA_REG_STATUS << 2);
90 ioaddr->command_addr = ioaddr->cmd_addr + (ATA_REG_CMD << 2);
91}
92
Greg Kroah-Hartman0ec24912012-12-21 13:19:58 -080093static int pata_imx_probe(struct platform_device *pdev)
Arnaud Patard (Rtp)e39c75c2011-07-26 16:58:19 +020094{
95 struct ata_host *host;
96 struct ata_port *ap;
97 struct pata_imx_priv *priv;
98 int irq = 0;
99 struct resource *io_res;
Sascha Hauerff540d02013-04-04 11:25:05 +0200100 int ret;
Arnaud Patard (Rtp)e39c75c2011-07-26 16:58:19 +0200101
Arnaud Patard (Rtp)e39c75c2011-07-26 16:58:19 +0200102 irq = platform_get_irq(pdev, 0);
Fabio Estevam3ef9cc32014-02-17 19:05:57 -0300103 if (irq < 0)
104 return irq;
Arnaud Patard (Rtp)e39c75c2011-07-26 16:58:19 +0200105
106 priv = devm_kzalloc(&pdev->dev,
107 sizeof(struct pata_imx_priv), GFP_KERNEL);
108 if (!priv)
109 return -ENOMEM;
110
Sascha Hauer50f5a342013-04-04 11:25:04 +0200111 priv->clk = devm_clk_get(&pdev->dev, NULL);
Arnaud Patard (Rtp)e39c75c2011-07-26 16:58:19 +0200112 if (IS_ERR(priv->clk)) {
113 dev_err(&pdev->dev, "Failed to get clock\n");
114 return PTR_ERR(priv->clk);
115 }
116
Fabio Estevam0475c942014-01-25 19:46:23 -0200117 ret = clk_prepare_enable(priv->clk);
118 if (ret)
119 return ret;
Arnaud Patard (Rtp)e39c75c2011-07-26 16:58:19 +0200120
121 host = ata_host_alloc(&pdev->dev, 1);
Sascha Hauerff540d02013-04-04 11:25:05 +0200122 if (!host) {
123 ret = -ENOMEM;
124 goto err;
125 }
Arnaud Patard (Rtp)e39c75c2011-07-26 16:58:19 +0200126
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
Fabio Estevamb314fc72014-02-17 19:05:56 -0300134 io_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
135 priv->host_regs = devm_ioremap_resource(&pdev->dev, io_res);
Bartlomiej Zolnierkiewicz13e8e782014-03-14 18:33:13 +0100136 if (IS_ERR(priv->host_regs)) {
137 ret = PTR_ERR(priv->host_regs);
Sascha Hauerff540d02013-04-04 11:25:05 +0200138 goto err;
Arnaud Patard (Rtp)e39c75c2011-07-26 16:58:19 +0200139 }
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 */
Sascha Hauerff540d02013-04-04 11:25:05 +0200161 ret = ata_host_activate(host, irq, ata_sff_interrupt, 0,
Arnaud Patard (Rtp)e39c75c2011-07-26 16:58:19 +0200162 &pata_imx_sht);
163
Sascha Hauerff540d02013-04-04 11:25:05 +0200164 if (ret)
165 goto err;
166
167 return 0;
168err:
Fabio Estevama18dada2012-07-07 19:34:05 -0300169 clk_disable_unprepare(priv->clk);
Sascha Hauer50f5a342013-04-04 11:25:04 +0200170
Sascha Hauerff540d02013-04-04 11:25:05 +0200171 return ret;
Arnaud Patard (Rtp)e39c75c2011-07-26 16:58:19 +0200172}
173
Greg Kroah-Hartman0ec24912012-12-21 13:19:58 -0800174static int pata_imx_remove(struct platform_device *pdev)
Arnaud Patard (Rtp)e39c75c2011-07-26 16:58:19 +0200175{
Jingoo Hand89995d2013-05-23 19:41:21 +0900176 struct ata_host *host = platform_get_drvdata(pdev);
Arnaud Patard (Rtp)e39c75c2011-07-26 16:58:19 +0200177 struct pata_imx_priv *priv = host->private_data;
178
179 ata_host_detach(host);
180
181 __raw_writel(0, priv->host_regs + PATA_IMX_ATA_INT_EN);
182
Fabio Estevama18dada2012-07-07 19:34:05 -0300183 clk_disable_unprepare(priv->clk);
Arnaud Patard (Rtp)e39c75c2011-07-26 16:58:19 +0200184
185 return 0;
186}
187
Bartlomiej Zolnierkiewicz58eb8cd2014-05-07 17:17:44 +0200188#ifdef CONFIG_PM_SLEEP
Arnaud Patard (Rtp)e39c75c2011-07-26 16:58:19 +0200189static int pata_imx_suspend(struct device *dev)
190{
191 struct ata_host *host = dev_get_drvdata(dev);
192 struct pata_imx_priv *priv = host->private_data;
193 int ret;
194
195 ret = ata_host_suspend(host, PMSG_SUSPEND);
196 if (!ret) {
197 __raw_writel(0, priv->host_regs + PATA_IMX_ATA_INT_EN);
198 priv->ata_ctl =
199 __raw_readl(priv->host_regs + PATA_IMX_ATA_CONTROL);
Fabio Estevama18dada2012-07-07 19:34:05 -0300200 clk_disable_unprepare(priv->clk);
Arnaud Patard (Rtp)e39c75c2011-07-26 16:58:19 +0200201 }
202
203 return ret;
204}
205
206static int pata_imx_resume(struct device *dev)
207{
208 struct ata_host *host = dev_get_drvdata(dev);
209 struct pata_imx_priv *priv = host->private_data;
210
Fabio Estevam0475c942014-01-25 19:46:23 -0200211 int ret = clk_prepare_enable(priv->clk);
212 if (ret)
213 return ret;
Arnaud Patard (Rtp)e39c75c2011-07-26 16:58:19 +0200214
215 __raw_writel(priv->ata_ctl, priv->host_regs + PATA_IMX_ATA_CONTROL);
216
217 __raw_writel(PATA_IMX_ATA_INTR_ATA_INTRQ2,
218 priv->host_regs + PATA_IMX_ATA_INT_EN);
219
220 ata_host_resume(host);
221
222 return 0;
223}
224
225static const struct dev_pm_ops pata_imx_pm_ops = {
226 .suspend = pata_imx_suspend,
227 .resume = pata_imx_resume,
228};
229#endif
230
Sascha Hauerb9d15db2013-04-04 11:25:07 +0200231static const struct of_device_id imx_pata_dt_ids[] = {
232 {
233 .compatible = "fsl,imx27-pata",
234 }, {
235 /* sentinel */
236 }
237};
Niels de Vos71ab1d52013-07-29 09:38:38 +0200238MODULE_DEVICE_TABLE(of, imx_pata_dt_ids);
Sascha Hauerb9d15db2013-04-04 11:25:07 +0200239
Arnaud Patard (Rtp)e39c75c2011-07-26 16:58:19 +0200240static struct platform_driver pata_imx_driver = {
241 .probe = pata_imx_probe,
Greg Kroah-Hartman0ec24912012-12-21 13:19:58 -0800242 .remove = pata_imx_remove,
Arnaud Patard (Rtp)e39c75c2011-07-26 16:58:19 +0200243 .driver = {
244 .name = DRV_NAME,
Sascha Hauerb9d15db2013-04-04 11:25:07 +0200245 .of_match_table = imx_pata_dt_ids,
Arnaud Patard (Rtp)e39c75c2011-07-26 16:58:19 +0200246 .owner = THIS_MODULE,
Bartlomiej Zolnierkiewicz58eb8cd2014-05-07 17:17:44 +0200247#ifdef CONFIG_PM_SLEEP
Arnaud Patard (Rtp)e39c75c2011-07-26 16:58:19 +0200248 .pm = &pata_imx_pm_ops,
249#endif
250 },
251};
252
Axel Lin99c8ea32011-11-27 14:44:26 +0800253module_platform_driver(pata_imx_driver);
Arnaud Patard (Rtp)e39c75c2011-07-26 16:58:19 +0200254
255MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>");
256MODULE_DESCRIPTION("low-level driver for iMX PATA");
257MODULE_LICENSE("GPL");
258MODULE_ALIAS("platform:" DRV_NAME);