Orange Pi5 kernel

/*
 * 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 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(&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;
}
 
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;
}
 
#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;
}
 
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		= 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);