linux-imx

/*

 * 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);

​