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/*
* Freescale iMX PATA driver
*
* Copyright (C) 2011 Arnaud Patard <arnaud.patard@rtp-net.org>
*
* Based on pata_platform - Copyright (C) 2006 - 2007 Paul Mundt
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* TODO:
* - dmaengine support
*/
#include <linux/ata.h>
#include <linux/clk.h>
#include <linux/libata.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/platform_device.h>
#define DRV_NAME "pata_imx"
#define PATA_IMX_ATA_TIME_OFF 0x00
#define PATA_IMX_ATA_TIME_ON 0x01
#define PATA_IMX_ATA_TIME_1 0x02
#define PATA_IMX_ATA_TIME_2W 0x03
#define PATA_IMX_ATA_TIME_2R 0x04
#define PATA_IMX_ATA_TIME_AX 0x05
#define PATA_IMX_ATA_TIME_PIO_RDX 0x06
#define PATA_IMX_ATA_TIME_4 0x07
#define PATA_IMX_ATA_TIME_9 0x08
#define PATA_IMX_ATA_CONTROL 0x24
#define PATA_IMX_ATA_CTRL_FIFO_RST_B (1<<7)
#define PATA_IMX_ATA_CTRL_ATA_RST_B (1<<6)
#define PATA_IMX_ATA_CTRL_IORDY_EN (1<<0)
#define PATA_IMX_ATA_INT_EN 0x2C
#define PATA_IMX_ATA_INTR_ATA_INTRQ2 (1<<3)
#define PATA_IMX_DRIVE_DATA 0xA0
#define PATA_IMX_DRIVE_CONTROL 0xD8
static u32 pio_t4[] = { 30, 20, 15, 10, 10 };
static u32 pio_t9[] = { 20, 15, 10, 10, 10 };
static u32 pio_tA[] = { 35, 35, 35, 35, 35 };
struct pata_imx_priv {
struct clk *clk;
/* timings/interrupt/control regs */
void __iomem *host_regs;
u32 ata_ctl;
};
static void pata_imx_set_timing(struct ata_device *adev,
struct pata_imx_priv *priv)
{
struct ata_timing timing;
unsigned long clkrate;
u32 T, mode;
clkrate = clk_get_rate(priv->clk);
if (adev->pio_mode < XFER_PIO_0 || adev->pio_mode > XFER_PIO_4 ||
!clkrate)
return;
T = 1000000000 / clkrate;
ata_timing_compute(adev, adev->pio_mode, &timing, T * 1000, 0);
mode = adev->pio_mode - XFER_PIO_0;
writeb(3, priv->host_regs + PATA_IMX_ATA_TIME_OFF);
writeb(3, priv->host_regs + PATA_IMX_ATA_TIME_ON);
writeb(timing.setup, priv->host_regs + PATA_IMX_ATA_TIME_1);
writeb(timing.act8b, priv->host_regs + PATA_IMX_ATA_TIME_2W);
writeb(timing.act8b, priv->host_regs + PATA_IMX_ATA_TIME_2R);
writeb(1, priv->host_regs + PATA_IMX_ATA_TIME_PIO_RDX);
writeb(pio_t4[mode] / T + 1, priv->host_regs + PATA_IMX_ATA_TIME_4);
writeb(pio_t9[mode] / T + 1, priv->host_regs + PATA_IMX_ATA_TIME_9);
writeb(pio_tA[mode] / T + 1, priv->host_regs + PATA_IMX_ATA_TIME_AX);
}
static void pata_imx_set_piomode(struct ata_port *ap, struct ata_device *adev)
{
struct pata_imx_priv *priv = ap->host->private_data;
u32 val;
pata_imx_set_timing(adev, priv);
val = __raw_readl(priv->host_regs + PATA_IMX_ATA_CONTROL);
if (ata_pio_need_iordy(adev))
val |= PATA_IMX_ATA_CTRL_IORDY_EN;
else
val &= ~PATA_IMX_ATA_CTRL_IORDY_EN;
__raw_writel(val, priv->host_regs + PATA_IMX_ATA_CONTROL);
}
static const struct scsi_host_template pata_imx_sht = {
ATA_PIO_SHT(DRV_NAME),
};
static struct ata_port_operations pata_imx_port_ops = {
.inherits = &ata_sff_port_ops,
.sff_data_xfer = ata_sff_data_xfer32,
.cable_detect = ata_cable_unknown,
.set_piomode = pata_imx_set_piomode,
};
static void pata_imx_setup_port(struct ata_ioports *ioaddr)
{
/* Fixup the port shift for platforms that need it */
ioaddr->data_addr = ioaddr->cmd_addr + (ATA_REG_DATA << 2);
ioaddr->error_addr = ioaddr->cmd_addr + (ATA_REG_ERR << 2);
ioaddr->feature_addr = ioaddr->cmd_addr + (ATA_REG_FEATURE << 2);
ioaddr->nsect_addr = ioaddr->cmd_addr + (ATA_REG_NSECT << 2);
ioaddr->lbal_addr = ioaddr->cmd_addr + (ATA_REG_LBAL << 2);
ioaddr->lbam_addr = ioaddr->cmd_addr + (ATA_REG_LBAM << 2);
ioaddr->lbah_addr = ioaddr->cmd_addr + (ATA_REG_LBAH << 2);
ioaddr->device_addr = ioaddr->cmd_addr + (ATA_REG_DEVICE << 2);
ioaddr->status_addr = ioaddr->cmd_addr + (ATA_REG_STATUS << 2);
ioaddr->command_addr = ioaddr->cmd_addr + (ATA_REG_CMD << 2);
}
static int pata_imx_probe(struct platform_device *pdev)
{
struct ata_host *host;
struct ata_port *ap;
struct pata_imx_priv *priv;
int irq = 0;
struct resource *io_res;
int ret;
irq = platform_get_irq(pdev, 0);
if (irq < 0)
return irq;
priv = devm_kzalloc(&pdev->dev,
sizeof(struct pata_imx_priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->clk = devm_clk_get_enabled(&pdev->dev, NULL);
if (IS_ERR(priv->clk)) {
dev_err(&pdev->dev, "Failed to get and enable clock\n");
return PTR_ERR(priv->clk);
}
host = ata_host_alloc(&pdev->dev, 1);
if (!host)
return -ENOMEM;
host->private_data = priv;
ap = host->ports[0];
ap->ops = &pata_imx_port_ops;
ap->pio_mask = ATA_PIO4;
ap->flags |= ATA_FLAG_SLAVE_POSS;
priv->host_regs = devm_platform_get_and_ioremap_resource(pdev, 0, &io_res);
if (IS_ERR(priv->host_regs))
return PTR_ERR(priv->host_regs);
ap->ioaddr.cmd_addr = priv->host_regs + PATA_IMX_DRIVE_DATA;
ap->ioaddr.ctl_addr = priv->host_regs + PATA_IMX_DRIVE_CONTROL;
ap->ioaddr.altstatus_addr = ap->ioaddr.ctl_addr;
pata_imx_setup_port(&ap->ioaddr);
ata_port_desc(ap, "cmd 0x%llx ctl 0x%llx",
(unsigned long long)io_res->start + PATA_IMX_DRIVE_DATA,
(unsigned long long)io_res->start + PATA_IMX_DRIVE_CONTROL);
/* deassert resets */
__raw_writel(PATA_IMX_ATA_CTRL_FIFO_RST_B |
PATA_IMX_ATA_CTRL_ATA_RST_B,
priv->host_regs + PATA_IMX_ATA_CONTROL);
/* enable interrupts */
__raw_writel(PATA_IMX_ATA_INTR_ATA_INTRQ2,
priv->host_regs + PATA_IMX_ATA_INT_EN);
/* activate */
ret = ata_host_activate(host, irq, ata_sff_interrupt, 0,
&pata_imx_sht);
if (ret)
return ret;
return 0;
}
static void pata_imx_remove(struct platform_device *pdev)
{
struct ata_host *host = platform_get_drvdata(pdev);
struct pata_imx_priv *priv = host->private_data;
ata_host_detach(host);
__raw_writel(0, priv->host_regs + PATA_IMX_ATA_INT_EN);
}
#ifdef CONFIG_PM_SLEEP
static int pata_imx_suspend(struct device *dev)
{
struct ata_host *host = dev_get_drvdata(dev);
struct pata_imx_priv *priv = host->private_data;
ata_host_suspend(host, PMSG_SUSPEND);
__raw_writel(0, priv->host_regs + PATA_IMX_ATA_INT_EN);
priv->ata_ctl = __raw_readl(priv->host_regs + PATA_IMX_ATA_CONTROL);
clk_disable_unprepare(priv->clk);
return 0;
}
static int pata_imx_resume(struct device *dev)
{
struct ata_host *host = dev_get_drvdata(dev);
struct pata_imx_priv *priv = host->private_data;
int ret = clk_prepare_enable(priv->clk);
if (ret)
return ret;
__raw_writel(priv->ata_ctl, priv->host_regs + PATA_IMX_ATA_CONTROL);
__raw_writel(PATA_IMX_ATA_INTR_ATA_INTRQ2,
priv->host_regs + PATA_IMX_ATA_INT_EN);
ata_host_resume(host);
return 0;
}
#endif
static SIMPLE_DEV_PM_OPS(pata_imx_pm_ops, pata_imx_suspend, pata_imx_resume);
static const struct of_device_id imx_pata_dt_ids[] = {
{
.compatible = "fsl,imx27-pata",
}, {
/* sentinel */
}
};
MODULE_DEVICE_TABLE(of, imx_pata_dt_ids);
static struct platform_driver pata_imx_driver = {
.probe = pata_imx_probe,
.remove_new = pata_imx_remove,
.driver = {
.name = DRV_NAME,
.of_match_table = imx_pata_dt_ids,
.pm = &pata_imx_pm_ops,
},
};
module_platform_driver(pata_imx_driver);
MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>");
MODULE_DESCRIPTION("low-level driver for iMX PATA");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:" DRV_NAME);
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