Release 4.11 drivers/ata/pata_imx.c

Directory: drivers/ata
/*
 * 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/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);
}

Contributors
Person Tokens Prop Commits CommitProp
Vladimir Zapolskiy 214 100.00% 1 100.00%
Total 214 100.00% 1 100.00%



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);
}

Contributors
Person Tokens Prop Commits CommitProp
Arnaud Patard 63 82.89% 1 33.33%
Vladimir Zapolskiy 13 17.11% 2 66.67%
Total 76 100.00% 3 100.00%


static 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_xfer_noirq,
	.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);
}

Contributors
Person Tokens Prop Commits CommitProp
Arnaud Patard 152 100.00% 1 100.00%
Total 152 100.00% 1 100.00%



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(&pdev->dev, NULL);
	if (IS_ERR(priv->clk)) {
		dev_err(&pdev->dev, "Failed to get clock\n");
		return PTR_ERR(priv->clk);
	}

	ret = clk_prepare_enable(priv->clk);
	if (ret)
		return ret;

	host = ata_host_alloc(&pdev->dev, 1);
	if (!host) {
		ret = -ENOMEM;
		goto err;
	}

	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;

	io_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	priv->host_regs = devm_ioremap_resource(&pdev->dev, io_res);
	if (IS_ERR(priv->host_regs)) {
		ret = PTR_ERR(priv->host_regs);
		goto err;
	}

	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)
		goto err;

	return 0;
err:
	clk_disable_unprepare(priv->clk);

	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
Arnaud Patard 329 84.36% 1 11.11%
Sascha Hauer 29 7.44% 2 22.22%
Fabio Estevam 25 6.41% 4 44.44%
Bartlomiej Zolnierkiewicz 6 1.54% 1 11.11%
Vladimir Zapolskiy 1 0.26% 1 11.11%
Total 390 100.00% 9 100.00%



static int 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);

	clk_disable_unprepare(priv->clk);

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
Arnaud Patard 54 96.43% 1 33.33%
Jingoo Han 1 1.79% 1 33.33%
Fabio Estevam 1 1.79% 1 33.33%
Total 56 100.00% 3 100.00%

#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;
	int ret;

	ret = ata_host_suspend(host, PMSG_SUSPEND);
	if (!ret) {
		__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 ret;
}

Contributors
Person Tokens Prop Commits CommitProp
Arnaud Patard 82 98.80% 1 50.00%
Fabio Estevam 1 1.20% 1 50.00%
Total 83 100.00% 2 100.00%



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;
}
Contributors
Person Tokens Prop Commits CommitProp
Arnaud Patard 67 84.81% 1 33.33%
Fabio Estevam 12 15.19% 2 66.67%
Total 79 100.00% 3 100.00%

#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		= 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);
Overall Contributors
Person Tokens Prop Commits CommitProp
Arnaud Patard 909 67.13% 1 5.26%
Vladimir Zapolskiy 322 23.78% 4 21.05%
Sascha Hauer 56 4.14% 4 21.05%
Fabio Estevam 50 3.69% 5 26.32%
Niels de Vos 7 0.52% 1 5.26%
Bartlomiej Zolnierkiewicz 7 0.52% 2 10.53%
Axel Lin 2 0.15% 1 5.26%
Jingoo Han 1 0.07% 1 5.26%
Total 1354 100.00% 19 100.00%
Directory: drivers/ata

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with cregit.
Person	Tokens	Prop	Commits	CommitProp
Vladimir Zapolskiy	214	100.00%	1	100.00%
Total	214	100.00%	1	100.00%
cregit-Linux how code gets into the kernel

Release 4.11 drivers/ata/pata_imx.c

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Overall Contributors
