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