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        u8 *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_printk(dev, KERN_INFO, "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 __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
 164free_priv:
 165        clk_disable_unprepare(priv->clk);
 166        clk_put(priv->clk);
 167        return -ENOMEM;
 168}
 169
 170static 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
 186static 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
 203static 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
 220static const struct dev_pm_ops pata_imx_pm_ops = {
 221        .suspend        = pata_imx_suspend,
 222        .resume         = pata_imx_resume,
 223};
 224#endif
 225
 226static 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
 238module_platform_driver(pata_imx_driver);
 239
 240MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>");
 241MODULE_DESCRIPTION("low-level driver for iMX PATA");
 242MODULE_LICENSE("GPL");
 243MODULE_ALIAS("platform:" DRV_NAME);
 244
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