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Linux/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/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 
 36 struct pata_imx_priv {
 37         struct clk *clk;
 38         /* timings/interrupt/control regs */
 39         void __iomem *host_regs;
 40         u32 ata_ctl;
 41 };
 42 
 43 static 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 
 62                 ata_dev_info(dev, "configured for PIO\n");
 63         }
 64         return 0;
 65 }
 66 
 67 static struct scsi_host_template pata_imx_sht = {
 68         ATA_PIO_SHT(DRV_NAME),
 69 };
 70 
 71 static 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 
 78 static 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 
 93 static int pata_imx_probe(struct platform_device *pdev)
 94 {
 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;
100         int ret;
101 
102         irq = platform_get_irq(pdev, 0);
103         if (irq < 0)
104                 return irq;
105 
106         priv = devm_kzalloc(&pdev->dev,
107                                 sizeof(struct pata_imx_priv), GFP_KERNEL);
108         if (!priv)
109                 return -ENOMEM;
110 
111         priv->clk = devm_clk_get(&pdev->dev, NULL);
112         if (IS_ERR(priv->clk)) {
113                 dev_err(&pdev->dev, "Failed to get clock\n");
114                 return PTR_ERR(priv->clk);
115         }
116 
117         ret = clk_prepare_enable(priv->clk);
118         if (ret)
119                 return ret;
120 
121         host = ata_host_alloc(&pdev->dev, 1);
122         if (!host) {
123                 ret = -ENOMEM;
124                 goto err;
125         }
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         io_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
135         priv->host_regs = devm_ioremap_resource(&pdev->dev, io_res);
136         if (IS_ERR(priv->host_regs)) {
137                 ret = PTR_ERR(priv->host_regs);
138                 goto err;
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         ret = ata_host_activate(host, irq, ata_sff_interrupt, 0,
162                                 &pata_imx_sht);
163 
164         if (ret)
165                 goto err;
166 
167         return 0;
168 err:
169         clk_disable_unprepare(priv->clk);
170 
171         return ret;
172 }
173 
174 static int pata_imx_remove(struct platform_device *pdev)
175 {
176         struct ata_host *host = platform_get_drvdata(pdev);
177         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 
183         clk_disable_unprepare(priv->clk);
184 
185         return 0;
186 }
187 
188 #ifdef CONFIG_PM_SLEEP
189 static 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);
200                 clk_disable_unprepare(priv->clk);
201         }
202 
203         return ret;
204 }
205 
206 static 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 
211         int ret = clk_prepare_enable(priv->clk);
212         if (ret)
213                 return ret;
214 
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 
225 static const struct dev_pm_ops pata_imx_pm_ops = {
226         .suspend        = pata_imx_suspend,
227         .resume         = pata_imx_resume,
228 };
229 #endif
230 
231 static const struct of_device_id imx_pata_dt_ids[] = {
232         {
233                 .compatible = "fsl,imx27-pata",
234         }, {
235                 /* sentinel */
236         }
237 };
238 MODULE_DEVICE_TABLE(of, imx_pata_dt_ids);
239 
240 static struct platform_driver pata_imx_driver = {
241         .probe          = pata_imx_probe,
242         .remove         = pata_imx_remove,
243         .driver = {
244                 .name           = DRV_NAME,
245                 .of_match_table = imx_pata_dt_ids,
246                 .owner          = THIS_MODULE,
247 #ifdef CONFIG_PM_SLEEP
248                 .pm             = &pata_imx_pm_ops,
249 #endif
250         },
251 };
252 
253 module_platform_driver(pata_imx_driver);
254 
255 MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>");
256 MODULE_DESCRIPTION("low-level driver for iMX PATA");
257 MODULE_LICENSE("GPL");
258 MODULE_ALIAS("platform:" DRV_NAME);
259 

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