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Release 4.10 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); }

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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); }

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arnaud patardarnaud patard6382.89%133.33%
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Total76100.00%3100.00%

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); }

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arnaud patardarnaud patard152100.00%1100.00%
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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; }

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arnaud patardarnaud patard32984.36%111.11%
sascha hauersascha hauer297.44%222.22%
fabio estevamfabio estevam256.41%444.44%
bartlomiej zolnierkiewiczbartlomiej zolnierkiewicz61.54%111.11%
vladimir zapolskiyvladimir zapolskiy10.26%111.11%
Total390100.00%9100.00%


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; }

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arnaud patardarnaud patard5496.43%133.33%
fabio estevamfabio estevam11.79%133.33%
jingoo hanjingoo han11.79%133.33%
Total56100.00%3100.00%

#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; }

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arnaud patardarnaud patard8298.80%150.00%
fabio estevamfabio estevam11.20%150.00%
Total83100.00%2100.00%


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; }

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arnaud patardarnaud patard6784.81%133.33%
fabio estevamfabio estevam1215.19%266.67%
Total79100.00%3100.00%

#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);

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arnaud patardarnaud patard90967.13%15.26%
vladimir zapolskiyvladimir zapolskiy32223.78%421.05%
sascha hauersascha hauer564.14%421.05%
fabio estevamfabio estevam503.69%526.32%
bartlomiej zolnierkiewiczbartlomiej zolnierkiewicz70.52%210.53%
niels de vosniels de vos70.52%15.26%
axel linaxel lin20.15%15.26%
jingoo hanjingoo han10.07%15.26%
Total1354100.00%19100.00%
Directory: drivers/ata
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