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_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 __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 <arnaud.patard@rtp-net.org>");
 241 MODULE_DESCRIPTION("low-level driver for iMX PATA");
 242 MODULE_LICENSE("GPL");
 243 MODULE_ALIAS("platform:" DRV_NAME);