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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/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         void __iomem *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_info(dev, "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 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         int ret;
102 
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 
116         priv->clk = devm_clk_get(&pdev->dev, NULL);
117         if (IS_ERR(priv->clk)) {
118                 dev_err(&pdev->dev, "Failed to get clock\n");
119                 return PTR_ERR(priv->clk);
120         }
121 
122         ret = clk_prepare_enable(priv->clk);
123         if (ret)
124                 return ret;
125 
126         host = ata_host_alloc(&pdev->dev, 1);
127         if (!host) {
128                 ret = -ENOMEM;
129                 goto err;
130         }
131 
132         host->private_data = priv;
133         ap = host->ports[0];
134 
135         ap->ops = &pata_imx_port_ops;
136         ap->pio_mask = ATA_PIO0;
137         ap->flags |= ATA_FLAG_SLAVE_POSS;
138 
139         priv->host_regs = devm_ioremap(&pdev->dev, io_res->start,
140                 resource_size(io_res));
141         if (!priv->host_regs) {
142                 dev_err(&pdev->dev, "failed to map IO/CTL base\n");
143                 ret = -EBUSY;
144                 goto err;
145         }
146 
147         ap->ioaddr.cmd_addr = priv->host_regs + PATA_IMX_DRIVE_DATA;
148         ap->ioaddr.ctl_addr = priv->host_regs + PATA_IMX_DRIVE_CONTROL;
149 
150         ap->ioaddr.altstatus_addr = ap->ioaddr.ctl_addr;
151 
152         pata_imx_setup_port(&ap->ioaddr);
153 
154         ata_port_desc(ap, "cmd 0x%llx ctl 0x%llx",
155                 (unsigned long long)io_res->start + PATA_IMX_DRIVE_DATA,
156                 (unsigned long long)io_res->start + PATA_IMX_DRIVE_CONTROL);
157 
158         /* deassert resets */
159         __raw_writel(PATA_IMX_ATA_CTRL_FIFO_RST_B |
160                         PATA_IMX_ATA_CTRL_ATA_RST_B,
161                         priv->host_regs + PATA_IMX_ATA_CONTROL);
162         /* enable interrupts */
163         __raw_writel(PATA_IMX_ATA_INTR_ATA_INTRQ2,
164                         priv->host_regs + PATA_IMX_ATA_INT_EN);
165 
166         /* activate */
167         ret = ata_host_activate(host, irq, ata_sff_interrupt, 0,
168                                 &pata_imx_sht);
169 
170         if (ret)
171                 goto err;
172 
173         return 0;
174 err:
175         clk_disable_unprepare(priv->clk);
176 
177         return ret;
178 }
179 
180 static int pata_imx_remove(struct platform_device *pdev)
181 {
182         struct ata_host *host = platform_get_drvdata(pdev);
183         struct pata_imx_priv *priv = host->private_data;
184 
185         ata_host_detach(host);
186 
187         __raw_writel(0, priv->host_regs + PATA_IMX_ATA_INT_EN);
188 
189         clk_disable_unprepare(priv->clk);
190 
191         return 0;
192 }
193 
194 #ifdef CONFIG_PM
195 static int pata_imx_suspend(struct device *dev)
196 {
197         struct ata_host *host = dev_get_drvdata(dev);
198         struct pata_imx_priv *priv = host->private_data;
199         int ret;
200 
201         ret = ata_host_suspend(host, PMSG_SUSPEND);
202         if (!ret) {
203                 __raw_writel(0, priv->host_regs + PATA_IMX_ATA_INT_EN);
204                 priv->ata_ctl =
205                         __raw_readl(priv->host_regs + PATA_IMX_ATA_CONTROL);
206                 clk_disable_unprepare(priv->clk);
207         }
208 
209         return ret;
210 }
211 
212 static int pata_imx_resume(struct device *dev)
213 {
214         struct ata_host *host = dev_get_drvdata(dev);
215         struct pata_imx_priv *priv = host->private_data;
216 
217         int ret = clk_prepare_enable(priv->clk);
218         if (ret)
219                 return ret;
220 
221         __raw_writel(priv->ata_ctl, priv->host_regs + PATA_IMX_ATA_CONTROL);
222 
223         __raw_writel(PATA_IMX_ATA_INTR_ATA_INTRQ2,
224                         priv->host_regs + PATA_IMX_ATA_INT_EN);
225 
226         ata_host_resume(host);
227 
228         return 0;
229 }
230 
231 static const struct dev_pm_ops pata_imx_pm_ops = {
232         .suspend        = pata_imx_suspend,
233         .resume         = pata_imx_resume,
234 };
235 #endif
236 
237 static const struct of_device_id imx_pata_dt_ids[] = {
238         {
239                 .compatible = "fsl,imx27-pata",
240         }, {
241                 /* sentinel */
242         }
243 };
244 MODULE_DEVICE_TABLE(of, imx_pata_dt_ids);
245 
246 static struct platform_driver pata_imx_driver = {
247         .probe          = pata_imx_probe,
248         .remove         = pata_imx_remove,
249         .driver = {
250                 .name           = DRV_NAME,
251                 .of_match_table = imx_pata_dt_ids,
252                 .owner          = THIS_MODULE,
253 #ifdef CONFIG_PM
254                 .pm             = &pata_imx_pm_ops,
255 #endif
256         },
257 };
258 
259 module_platform_driver(pata_imx_driver);
260 
261 MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>");
262 MODULE_DESCRIPTION("low-level driver for iMX PATA");
263 MODULE_LICENSE("GPL");
264 MODULE_ALIAS("platform:" DRV_NAME);
265 

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