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linux/drivers/ata/pata_imx.c
Li Zetao 0e1bd497ca ata: pata_imx: Use helper function devm_clk_get_enabled() 
After the commit 7ef9651e97 ("clk: Provide new devm_clk helpers for
prepared and enabled clocks"), the pair of functions devm_clk_get() and
clk_prepare_enable() can be replaced with the single function
devm_clk_get_enabled(). Moreover, the driver will keep the clock
prepared (or enabled) during the whole lifetime of the device, so it is
unnecessary to unprepare and disable the clock explicitly when removing
the device or in the error handling path.

Signed-off-by: Li Zetao <lizetao1@huawei.com>
Reviewed-by: Sergey Shtylyov <s.shtylyov@omp.ru>
Signed-off-by: Damien Le Moal <dlemoal@kernel.org>
2023-08-17 07:45:32 +09:00

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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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