pata_cs5535: no need to program PIO0 timings during device init
[linux-2.6.git] / drivers / ata / pata_imx.c
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
37 struct pata_imx_priv {
38         struct clk *clk;
39         /* timings/interrupt/control regs */
40         u8 *host_regs;
41         u32 ata_ctl;
42 };
43
44 static 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
68 static struct scsi_host_template pata_imx_sht = {
69         ATA_PIO_SHT(DRV_NAME),
70 };
71
72 static 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
79 static 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
94 static 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
164 free_priv:
165         clk_disable(priv->clk);
166         clk_put(priv->clk);
167         return -ENOMEM;
168 }
169
170 static 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
186 static 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
203 static 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
220 static const struct dev_pm_ops pata_imx_pm_ops = {
221         .suspend        = pata_imx_suspend,
222         .resume         = pata_imx_resume,
223 };
224 #endif
225
226 static 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
238 static int __init pata_imx_init(void)
239 {
240         return platform_driver_register(&pata_imx_driver);
241 }
242
243 static void __exit pata_imx_exit(void)
244 {
245         platform_driver_unregister(&pata_imx_driver);
246 }
247 module_init(pata_imx_init);
248 module_exit(pata_imx_exit);
249
250 MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>");
251 MODULE_DESCRIPTION("low-level driver for iMX PATA");
252 MODULE_LICENSE("GPL");
253 MODULE_ALIAS("platform:" DRV_NAME);