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pata_imx.c
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1 /*
2  * Freescale iMX PATA driver
3  *
4  * Copyright (C) 2011 Arnaud Patard <[email protected]>
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_prepare_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_unprepare(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_unprepare(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_unprepare(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_prepare_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 module_platform_driver(pata_imx_driver);
239 
240 MODULE_AUTHOR("Arnaud Patard <[email protected]>");
241 MODULE_DESCRIPTION("low-level driver for iMX PATA");
242 MODULE_LICENSE("GPL");
243 MODULE_ALIAS("platform:" DRV_NAME);
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