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 #endif
 225
 226 static SIMPLE_DEV_PM_OPS(pata_imx_pm_ops, pata_imx_suspend, pata_imx_resume);
 227
 228 static const struct of_device_id imx_pata_dt_ids[] = {
 229         {
 230                 .compatible = "fsl,imx27-pata",
 231         }, {
 232                 /* sentinel */
 233         }
 234 };
 235 MODULE_DEVICE_TABLE(of, imx_pata_dt_ids);
 236
 237 static struct platform_driver pata_imx_driver = {
 238         .probe          = pata_imx_probe,
 239         .remove         = pata_imx_remove,
 240         .driver = {
 241                 .name           = DRV_NAME,
 242                 .of_match_table = imx_pata_dt_ids,
 243                 .pm             = &pata_imx_pm_ops,
 244         },
 245 };
 246
 247 module_platform_driver(pata_imx_driver);
 248
 249 MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>");
 250 MODULE_DESCRIPTION("low-level driver for iMX PATA");
 251 MODULE_LICENSE("GPL");
 252 MODULE_ALIAS("platform:" DRV_NAME);