linux/drivers/ata/pata_imx.c
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   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
  37struct pata_imx_priv {
  38        struct clk *clk;
  39        /* timings/interrupt/control regs */
  40        void __iomem *host_regs;
  41        u32 ata_ctl;
  42};
  43
  44static 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
  68static struct scsi_host_template pata_imx_sht = {
  69        ATA_PIO_SHT(DRV_NAME),
  70};
  71
  72static 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
  79static 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
  94static 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        clk_prepare_enable(priv->clk);
 123
 124        host = ata_host_alloc(&pdev->dev, 1);
 125        if (!host) {
 126                ret = -ENOMEM;
 127                goto err;
 128        }
 129
 130        host->private_data = priv;
 131        ap = host->ports[0];
 132
 133        ap->ops = &pata_imx_port_ops;
 134        ap->pio_mask = ATA_PIO0;
 135        ap->flags |= ATA_FLAG_SLAVE_POSS;
 136
 137        priv->host_regs = devm_ioremap(&pdev->dev, io_res->start,
 138                resource_size(io_res));
 139        if (!priv->host_regs) {
 140                dev_err(&pdev->dev, "failed to map IO/CTL base\n");
 141                ret = -EBUSY;
 142                goto err;
 143        }
 144
 145        ap->ioaddr.cmd_addr = priv->host_regs + PATA_IMX_DRIVE_DATA;
 146        ap->ioaddr.ctl_addr = priv->host_regs + PATA_IMX_DRIVE_CONTROL;
 147
 148        ap->ioaddr.altstatus_addr = ap->ioaddr.ctl_addr;
 149
 150        pata_imx_setup_port(&ap->ioaddr);
 151
 152        ata_port_desc(ap, "cmd 0x%llx ctl 0x%llx",
 153                (unsigned long long)io_res->start + PATA_IMX_DRIVE_DATA,
 154                (unsigned long long)io_res->start + PATA_IMX_DRIVE_CONTROL);
 155
 156        /* deassert resets */
 157        __raw_writel(PATA_IMX_ATA_CTRL_FIFO_RST_B |
 158                        PATA_IMX_ATA_CTRL_ATA_RST_B,
 159                        priv->host_regs + PATA_IMX_ATA_CONTROL);
 160        /* enable interrupts */
 161        __raw_writel(PATA_IMX_ATA_INTR_ATA_INTRQ2,
 162                        priv->host_regs + PATA_IMX_ATA_INT_EN);
 163
 164        /* activate */
 165        ret = ata_host_activate(host, irq, ata_sff_interrupt, 0,
 166                                &pata_imx_sht);
 167
 168        if (ret)
 169                goto err;
 170
 171        return 0;
 172err:
 173        clk_disable_unprepare(priv->clk);
 174
 175        return ret;
 176}
 177
 178static int pata_imx_remove(struct platform_device *pdev)
 179{
 180        struct ata_host *host = platform_get_drvdata(pdev);
 181        struct pata_imx_priv *priv = host->private_data;
 182
 183        ata_host_detach(host);
 184
 185        __raw_writel(0, priv->host_regs + PATA_IMX_ATA_INT_EN);
 186
 187        clk_disable_unprepare(priv->clk);
 188
 189        return 0;
 190}
 191
 192#ifdef CONFIG_PM
 193static int pata_imx_suspend(struct device *dev)
 194{
 195        struct ata_host *host = dev_get_drvdata(dev);
 196        struct pata_imx_priv *priv = host->private_data;
 197        int ret;
 198
 199        ret = ata_host_suspend(host, PMSG_SUSPEND);
 200        if (!ret) {
 201                __raw_writel(0, priv->host_regs + PATA_IMX_ATA_INT_EN);
 202                priv->ata_ctl =
 203                        __raw_readl(priv->host_regs + PATA_IMX_ATA_CONTROL);
 204                clk_disable_unprepare(priv->clk);
 205        }
 206
 207        return ret;
 208}
 209
 210static int pata_imx_resume(struct device *dev)
 211{
 212        struct ata_host *host = dev_get_drvdata(dev);
 213        struct pata_imx_priv *priv = host->private_data;
 214
 215        clk_prepare_enable(priv->clk);
 216
 217        __raw_writel(priv->ata_ctl, priv->host_regs + PATA_IMX_ATA_CONTROL);
 218
 219        __raw_writel(PATA_IMX_ATA_INTR_ATA_INTRQ2,
 220                        priv->host_regs + PATA_IMX_ATA_INT_EN);
 221
 222        ata_host_resume(host);
 223
 224        return 0;
 225}
 226
 227static const struct dev_pm_ops pata_imx_pm_ops = {
 228        .suspend        = pata_imx_suspend,
 229        .resume         = pata_imx_resume,
 230};
 231#endif
 232
 233static const struct of_device_id imx_pata_dt_ids[] = {
 234        {
 235                .compatible = "fsl,imx27-pata",
 236        }, {
 237                /* sentinel */
 238        }
 239};
 240MODULE_DEVICE_TABLE(of, imx_pata_dt_ids);
 241
 242static struct platform_driver pata_imx_driver = {
 243        .probe          = pata_imx_probe,
 244        .remove         = pata_imx_remove,
 245        .driver = {
 246                .name           = DRV_NAME,
 247                .of_match_table = imx_pata_dt_ids,
 248                .owner          = THIS_MODULE,
 249#ifdef CONFIG_PM
 250                .pm             = &pata_imx_pm_ops,
 251#endif
 252        },
 253};
 254
 255module_platform_driver(pata_imx_driver);
 256
 257MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>");
 258MODULE_DESCRIPTION("low-level driver for iMX PATA");
 259MODULE_LICENSE("GPL");
 260MODULE_ALIAS("platform:" DRV_NAME);
 261
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