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1/*2 * Freescale iMX PATA driver3 *4 * Copyright (C) 2011 Arnaud Patard <arnaud.patard@rtp-net.org>5 *6 * Based on pata_platform - Copyright (C) 2006 - 2007 Paul Mundt7 *8 * This file is subject to the terms and conditions of the GNU General Public9 * License. See the file "COPYING" in the main directory of this archive10 * for more details.11 *12 * TODO:13 * - dmaengine support14 */15 16#include <linux/ata.h>17#include <linux/clk.h>18#include <linux/libata.h>19#include <linux/module.h>20#include <linux/mod_devicetable.h>21#include <linux/platform_device.h>22 23#define DRV_NAME "pata_imx"24 25#define PATA_IMX_ATA_TIME_OFF 0x0026#define PATA_IMX_ATA_TIME_ON 0x0127#define PATA_IMX_ATA_TIME_1 0x0228#define PATA_IMX_ATA_TIME_2W 0x0329#define PATA_IMX_ATA_TIME_2R 0x0430#define PATA_IMX_ATA_TIME_AX 0x0531#define PATA_IMX_ATA_TIME_PIO_RDX 0x0632#define PATA_IMX_ATA_TIME_4 0x0733#define PATA_IMX_ATA_TIME_9 0x0834 35#define PATA_IMX_ATA_CONTROL 0x2436#define PATA_IMX_ATA_CTRL_FIFO_RST_B (1<<7)37#define PATA_IMX_ATA_CTRL_ATA_RST_B (1<<6)38#define PATA_IMX_ATA_CTRL_IORDY_EN (1<<0)39#define PATA_IMX_ATA_INT_EN 0x2C40#define PATA_IMX_ATA_INTR_ATA_INTRQ2 (1<<3)41#define PATA_IMX_DRIVE_DATA 0xA042#define PATA_IMX_DRIVE_CONTROL 0xD843 44static u32 pio_t4[] = { 30, 20, 15, 10, 10 };45static u32 pio_t9[] = { 20, 15, 10, 10, 10 };46static u32 pio_tA[] = { 35, 35, 35, 35, 35 };47 48struct pata_imx_priv {49 struct clk *clk;50 /* timings/interrupt/control regs */51 void __iomem *host_regs;52 u32 ata_ctl;53};54 55static void pata_imx_set_timing(struct ata_device *adev,56 struct pata_imx_priv *priv)57{58 struct ata_timing timing;59 unsigned long clkrate;60 u32 T, mode;61 62 clkrate = clk_get_rate(priv->clk);63 64 if (adev->pio_mode < XFER_PIO_0 || adev->pio_mode > XFER_PIO_4 ||65 !clkrate)66 return;67 68 T = 1000000000 / clkrate;69 ata_timing_compute(adev, adev->pio_mode, &timing, T * 1000, 0);70 71 mode = adev->pio_mode - XFER_PIO_0;72 73 writeb(3, priv->host_regs + PATA_IMX_ATA_TIME_OFF);74 writeb(3, priv->host_regs + PATA_IMX_ATA_TIME_ON);75 writeb(timing.setup, priv->host_regs + PATA_IMX_ATA_TIME_1);76 writeb(timing.act8b, priv->host_regs + PATA_IMX_ATA_TIME_2W);77 writeb(timing.act8b, priv->host_regs + PATA_IMX_ATA_TIME_2R);78 writeb(1, priv->host_regs + PATA_IMX_ATA_TIME_PIO_RDX);79 80 writeb(pio_t4[mode] / T + 1, priv->host_regs + PATA_IMX_ATA_TIME_4);81 writeb(pio_t9[mode] / T + 1, priv->host_regs + PATA_IMX_ATA_TIME_9);82 writeb(pio_tA[mode] / T + 1, priv->host_regs + PATA_IMX_ATA_TIME_AX);83}84 85static void pata_imx_set_piomode(struct ata_port *ap, struct ata_device *adev)86{87 struct pata_imx_priv *priv = ap->host->private_data;88 u32 val;89 90 pata_imx_set_timing(adev, priv);91 92 val = __raw_readl(priv->host_regs + PATA_IMX_ATA_CONTROL);93 if (ata_pio_need_iordy(adev))94 val |= PATA_IMX_ATA_CTRL_IORDY_EN;95 else96 val &= ~PATA_IMX_ATA_CTRL_IORDY_EN;97 __raw_writel(val, priv->host_regs + PATA_IMX_ATA_CONTROL);98}99 100static const struct scsi_host_template pata_imx_sht = {101 ATA_PIO_SHT(DRV_NAME),102};103 104static struct ata_port_operations pata_imx_port_ops = {105 .inherits = &ata_sff_port_ops,106 .sff_data_xfer = ata_sff_data_xfer32,107 .cable_detect = ata_cable_unknown,108 .set_piomode = pata_imx_set_piomode,109};110 111static void pata_imx_setup_port(struct ata_ioports *ioaddr)112{113 /* Fixup the port shift for platforms that need it */114 ioaddr->data_addr = ioaddr->cmd_addr + (ATA_REG_DATA << 2);115 ioaddr->error_addr = ioaddr->cmd_addr + (ATA_REG_ERR << 2);116 ioaddr->feature_addr = ioaddr->cmd_addr + (ATA_REG_FEATURE << 2);117 ioaddr->nsect_addr = ioaddr->cmd_addr + (ATA_REG_NSECT << 2);118 ioaddr->lbal_addr = ioaddr->cmd_addr + (ATA_REG_LBAL << 2);119 ioaddr->lbam_addr = ioaddr->cmd_addr + (ATA_REG_LBAM << 2);120 ioaddr->lbah_addr = ioaddr->cmd_addr + (ATA_REG_LBAH << 2);121 ioaddr->device_addr = ioaddr->cmd_addr + (ATA_REG_DEVICE << 2);122 ioaddr->status_addr = ioaddr->cmd_addr + (ATA_REG_STATUS << 2);123 ioaddr->command_addr = ioaddr->cmd_addr + (ATA_REG_CMD << 2);124}125 126static int pata_imx_probe(struct platform_device *pdev)127{128 struct ata_host *host;129 struct ata_port *ap;130 struct pata_imx_priv *priv;131 int irq = 0;132 struct resource *io_res;133 int ret;134 135 irq = platform_get_irq(pdev, 0);136 if (irq < 0)137 return irq;138 139 priv = devm_kzalloc(&pdev->dev,140 sizeof(struct pata_imx_priv), GFP_KERNEL);141 if (!priv)142 return -ENOMEM;143 144 priv->clk = devm_clk_get_enabled(&pdev->dev, NULL);145 if (IS_ERR(priv->clk)) {146 dev_err(&pdev->dev, "Failed to get and enable clock\n");147 return PTR_ERR(priv->clk);148 }149 150 host = ata_host_alloc(&pdev->dev, 1);151 if (!host)152 return -ENOMEM;153 154 host->private_data = priv;155 ap = host->ports[0];156 157 ap->ops = &pata_imx_port_ops;158 ap->pio_mask = ATA_PIO4;159 ap->flags |= ATA_FLAG_SLAVE_POSS;160 161 priv->host_regs = devm_platform_get_and_ioremap_resource(pdev, 0, &io_res);162 if (IS_ERR(priv->host_regs))163 return PTR_ERR(priv->host_regs);164 165 ap->ioaddr.cmd_addr = priv->host_regs + PATA_IMX_DRIVE_DATA;166 ap->ioaddr.ctl_addr = priv->host_regs + PATA_IMX_DRIVE_CONTROL;167 168 ap->ioaddr.altstatus_addr = ap->ioaddr.ctl_addr;169 170 pata_imx_setup_port(&ap->ioaddr);171 172 ata_port_desc(ap, "cmd 0x%llx ctl 0x%llx",173 (unsigned long long)io_res->start + PATA_IMX_DRIVE_DATA,174 (unsigned long long)io_res->start + PATA_IMX_DRIVE_CONTROL);175 176 /* deassert resets */177 __raw_writel(PATA_IMX_ATA_CTRL_FIFO_RST_B |178 PATA_IMX_ATA_CTRL_ATA_RST_B,179 priv->host_regs + PATA_IMX_ATA_CONTROL);180 /* enable interrupts */181 __raw_writel(PATA_IMX_ATA_INTR_ATA_INTRQ2,182 priv->host_regs + PATA_IMX_ATA_INT_EN);183 184 /* activate */185 ret = ata_host_activate(host, irq, ata_sff_interrupt, 0,186 &pata_imx_sht);187 188 if (ret)189 return ret;190 191 return 0;192}193 194static void pata_imx_remove(struct platform_device *pdev)195{196 struct ata_host *host = platform_get_drvdata(pdev);197 struct pata_imx_priv *priv = host->private_data;198 199 ata_host_detach(host);200 201 __raw_writel(0, priv->host_regs + PATA_IMX_ATA_INT_EN);202}203 204#ifdef CONFIG_PM_SLEEP205static int pata_imx_suspend(struct device *dev)206{207 struct ata_host *host = dev_get_drvdata(dev);208 struct pata_imx_priv *priv = host->private_data;209 210 ata_host_suspend(host, PMSG_SUSPEND);211 212 __raw_writel(0, priv->host_regs + PATA_IMX_ATA_INT_EN);213 priv->ata_ctl = __raw_readl(priv->host_regs + PATA_IMX_ATA_CONTROL);214 clk_disable_unprepare(priv->clk);215 216 return 0;217}218 219static int pata_imx_resume(struct device *dev)220{221 struct ata_host *host = dev_get_drvdata(dev);222 struct pata_imx_priv *priv = host->private_data;223 224 int ret = clk_prepare_enable(priv->clk);225 if (ret)226 return ret;227 228 __raw_writel(priv->ata_ctl, priv->host_regs + PATA_IMX_ATA_CONTROL);229 230 __raw_writel(PATA_IMX_ATA_INTR_ATA_INTRQ2,231 priv->host_regs + PATA_IMX_ATA_INT_EN);232 233 ata_host_resume(host);234 235 return 0;236}237#endif238 239static SIMPLE_DEV_PM_OPS(pata_imx_pm_ops, pata_imx_suspend, pata_imx_resume);240 241static const struct of_device_id imx_pata_dt_ids[] = {242 {243 .compatible = "fsl,imx27-pata",244 }, {245 /* sentinel */246 }247};248MODULE_DEVICE_TABLE(of, imx_pata_dt_ids);249 250static struct platform_driver pata_imx_driver = {251 .probe = pata_imx_probe,252 .remove_new = pata_imx_remove,253 .driver = {254 .name = DRV_NAME,255 .of_match_table = imx_pata_dt_ids,256 .pm = &pata_imx_pm_ops,257 },258};259 260module_platform_driver(pata_imx_driver);261 262MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>");263MODULE_DESCRIPTION("low-level driver for iMX PATA");264MODULE_LICENSE("GPL");265MODULE_ALIAS("platform:" DRV_NAME);266