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cb395b2010
linux-next/drivers/ata/ahci_qoriq.c
Yuantian Tang 6022c5cadf ahci: qoriq: correct the sata ecc setting error 
Sata ecc is controlled by only 1 bit which is 24bit in big-endian
in ecc register. So only setting 24bit to disable sata ecc prevents
other bits from being overwritten in ecc register.

Signed-off-by: Tang Yuantian <andy.tang@nxp.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
2017-03-09 11:55:23 -05:00

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/*
* Freescale QorIQ AHCI SATA platform driver
*
* Copyright 2015 Freescale, Inc.
* Tang Yuantian <Yuantian.Tang@freescale.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pm.h>
#include <linux/ahci_platform.h>
#include <linux/device.h>
#include <linux/of_address.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/libata.h>
#include "ahci.h"
#define DRV_NAME "ahci-qoriq"
/* port register definition */
#define PORT_PHY1 0xA8
#define PORT_PHY2 0xAC
#define PORT_PHY3 0xB0
#define PORT_PHY4 0xB4
#define PORT_PHY5 0xB8
#define PORT_AXICC 0xBC
#define PORT_TRANS 0xC8
/* port register default value */
#define AHCI_PORT_PHY_1_CFG 0xa003fffe
#define AHCI_PORT_TRANS_CFG 0x08000029
#define AHCI_PORT_AXICC_CFG 0x3fffffff
/* for ls1021a */
#define LS1021A_PORT_PHY2 0x28183414
#define LS1021A_PORT_PHY3 0x0e080e06
#define LS1021A_PORT_PHY4 0x064a080b
#define LS1021A_PORT_PHY5 0x2aa86470
#define LS1021A_AXICC_ADDR 0xC0
#define SATA_ECC_DISABLE 0x00020000
#define ECC_DIS_ARMV8_CH2 0x80000000
enum ahci_qoriq_type {
AHCI_LS1021A,
AHCI_LS1043A,
AHCI_LS2080A,
AHCI_LS1046A,
AHCI_LS2088A,
};
struct ahci_qoriq_priv {
struct ccsr_ahci *reg_base;
enum ahci_qoriq_type type;
void __iomem *ecc_addr;
bool is_dmacoherent;
};
static const struct of_device_id ahci_qoriq_of_match[] = {
{ .compatible = "fsl,ls1021a-ahci", .data = (void *)AHCI_LS1021A},
{ .compatible = "fsl,ls1043a-ahci", .data = (void *)AHCI_LS1043A},
{ .compatible = "fsl,ls2080a-ahci", .data = (void *)AHCI_LS2080A},
{ .compatible = "fsl,ls1046a-ahci", .data = (void *)AHCI_LS1046A},
{ .compatible = "fsl,ls2088a-ahci", .data = (void *)AHCI_LS2088A},
{},
};
MODULE_DEVICE_TABLE(of, ahci_qoriq_of_match);
static int ahci_qoriq_hardreset(struct ata_link *link, unsigned int *class,
unsigned long deadline)
{
const unsigned long *timing = sata_ehc_deb_timing(&link->eh_context);
void __iomem *port_mmio = ahci_port_base(link->ap);
u32 px_cmd, px_is, px_val;
struct ata_port *ap = link->ap;
struct ahci_port_priv *pp = ap->private_data;
struct ahci_host_priv *hpriv = ap->host->private_data;
struct ahci_qoriq_priv *qoriq_priv = hpriv->plat_data;
u8 *d2h_fis = pp->rx_fis + RX_FIS_D2H_REG;
struct ata_taskfile tf;
bool online;
int rc;
bool ls1021a_workaround = (qoriq_priv->type == AHCI_LS1021A);
DPRINTK("ENTER\n");
ahci_stop_engine(ap);
/*
* There is a errata on ls1021a Rev1.0 and Rev2.0 which is:
* A-009042: The device detection initialization sequence
* mistakenly resets some registers.
*
* Workaround for this is:
* The software should read and store PxCMD and PxIS values
* before issuing the device detection initialization sequence.
* After the sequence is complete, software should restore the
* PxCMD and PxIS with the stored values.
*/
if (ls1021a_workaround) {
px_cmd = readl(port_mmio + PORT_CMD);
px_is = readl(port_mmio + PORT_IRQ_STAT);
}
/* clear D2H reception area to properly wait for D2H FIS */
ata_tf_init(link->device, &tf);
tf.command = ATA_BUSY;
ata_tf_to_fis(&tf, 0, 0, d2h_fis);
rc = sata_link_hardreset(link, timing, deadline, &online,
ahci_check_ready);
/* restore the PxCMD and PxIS on ls1021 */
if (ls1021a_workaround) {
px_val = readl(port_mmio + PORT_CMD);
if (px_val != px_cmd)
writel(px_cmd, port_mmio + PORT_CMD);
px_val = readl(port_mmio + PORT_IRQ_STAT);
if (px_val != px_is)
writel(px_is, port_mmio + PORT_IRQ_STAT);
}
hpriv->start_engine(ap);
if (online)
*class = ahci_dev_classify(ap);
DPRINTK("EXIT, rc=%d, class=%u\n", rc, *class);
return rc;
}
static struct ata_port_operations ahci_qoriq_ops = {
.inherits = &ahci_ops,
.hardreset = ahci_qoriq_hardreset,
};
static const struct ata_port_info ahci_qoriq_port_info = {
.flags = AHCI_FLAG_COMMON | ATA_FLAG_NCQ,
.pio_mask = ATA_PIO4,
.udma_mask = ATA_UDMA6,
.port_ops = &ahci_qoriq_ops,
};
static struct scsi_host_template ahci_qoriq_sht = {
AHCI_SHT(DRV_NAME),
};
static int ahci_qoriq_phy_init(struct ahci_host_priv *hpriv)
{
struct ahci_qoriq_priv *qpriv = hpriv->plat_data;
void __iomem *reg_base = hpriv->mmio;
switch (qpriv->type) {
case AHCI_LS1021A:
if (!qpriv->ecc_addr)
return -EINVAL;
writel(SATA_ECC_DISABLE, qpriv->ecc_addr);
writel(AHCI_PORT_PHY_1_CFG, reg_base + PORT_PHY1);
writel(LS1021A_PORT_PHY2, reg_base + PORT_PHY2);
writel(LS1021A_PORT_PHY3, reg_base + PORT_PHY3);
writel(LS1021A_PORT_PHY4, reg_base + PORT_PHY4);
writel(LS1021A_PORT_PHY5, reg_base + PORT_PHY5);
writel(AHCI_PORT_TRANS_CFG, reg_base + PORT_TRANS);
if (qpriv->is_dmacoherent)
writel(AHCI_PORT_AXICC_CFG,
reg_base + LS1021A_AXICC_ADDR);
break;
case AHCI_LS1043A:
if (!qpriv->ecc_addr)
return -EINVAL;
writel(readl(qpriv->ecc_addr) | ECC_DIS_ARMV8_CH2,
qpriv->ecc_addr);
writel(AHCI_PORT_PHY_1_CFG, reg_base + PORT_PHY1);
writel(AHCI_PORT_TRANS_CFG, reg_base + PORT_TRANS);
if (qpriv->is_dmacoherent)
writel(AHCI_PORT_AXICC_CFG, reg_base + PORT_AXICC);
break;
case AHCI_LS2080A:
writel(AHCI_PORT_PHY_1_CFG, reg_base + PORT_PHY1);
writel(AHCI_PORT_TRANS_CFG, reg_base + PORT_TRANS);
if (qpriv->is_dmacoherent)
writel(AHCI_PORT_AXICC_CFG, reg_base + PORT_AXICC);
break;
case AHCI_LS1046A:
if (!qpriv->ecc_addr)
return -EINVAL;
writel(readl(qpriv->ecc_addr) | ECC_DIS_ARMV8_CH2,
qpriv->ecc_addr);
writel(AHCI_PORT_PHY_1_CFG, reg_base + PORT_PHY1);
writel(AHCI_PORT_TRANS_CFG, reg_base + PORT_TRANS);
if (qpriv->is_dmacoherent)
writel(AHCI_PORT_AXICC_CFG, reg_base + PORT_AXICC);
break;
case AHCI_LS2088A:
writel(AHCI_PORT_PHY_1_CFG, reg_base + PORT_PHY1);
writel(AHCI_PORT_TRANS_CFG, reg_base + PORT_TRANS);
if (qpriv->is_dmacoherent)
writel(AHCI_PORT_AXICC_CFG, reg_base + PORT_AXICC);
break;
}
return 0;
}
static int ahci_qoriq_probe(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
struct device *dev = &pdev->dev;
struct ahci_host_priv *hpriv;
struct ahci_qoriq_priv *qoriq_priv;
const struct of_device_id *of_id;
struct resource *res;
int rc;
hpriv = ahci_platform_get_resources(pdev);
if (IS_ERR(hpriv))
return PTR_ERR(hpriv);
of_id = of_match_node(ahci_qoriq_of_match, np);
if (!of_id)
return -ENODEV;
qoriq_priv = devm_kzalloc(dev, sizeof(*qoriq_priv), GFP_KERNEL);
if (!qoriq_priv)
return -ENOMEM;
qoriq_priv->type = (enum ahci_qoriq_type)of_id->data;
res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
"sata-ecc");
if (res) {
qoriq_priv->ecc_addr = devm_ioremap_resource(dev, res);
if (IS_ERR(qoriq_priv->ecc_addr))
return PTR_ERR(qoriq_priv->ecc_addr);
}
qoriq_priv->is_dmacoherent = of_dma_is_coherent(np);
rc = ahci_platform_enable_resources(hpriv);
if (rc)
return rc;
hpriv->plat_data = qoriq_priv;
rc = ahci_qoriq_phy_init(hpriv);
if (rc)
goto disable_resources;
rc = ahci_platform_init_host(pdev, hpriv, &ahci_qoriq_port_info,
&ahci_qoriq_sht);
if (rc)
goto disable_resources;
return 0;
disable_resources:
ahci_platform_disable_resources(hpriv);
return rc;
}
#ifdef CONFIG_PM_SLEEP
static int ahci_qoriq_resume(struct device *dev)
{
struct ata_host *host = dev_get_drvdata(dev);
struct ahci_host_priv *hpriv = host->private_data;
int rc;
rc = ahci_platform_enable_resources(hpriv);
if (rc)
return rc;
rc = ahci_qoriq_phy_init(hpriv);
if (rc)
goto disable_resources;
rc = ahci_platform_resume_host(dev);
if (rc)
goto disable_resources;
/* We resumed so update PM runtime state */
pm_runtime_disable(dev);
pm_runtime_set_active(dev);
pm_runtime_enable(dev);
return 0;
disable_resources:
ahci_platform_disable_resources(hpriv);
return rc;
}
#endif
static SIMPLE_DEV_PM_OPS(ahci_qoriq_pm_ops, ahci_platform_suspend,
ahci_qoriq_resume);
static struct platform_driver ahci_qoriq_driver = {
.probe = ahci_qoriq_probe,
.remove = ata_platform_remove_one,
.driver = {
.name = DRV_NAME,
.of_match_table = ahci_qoriq_of_match,
.pm = &ahci_qoriq_pm_ops,
},
};
module_platform_driver(ahci_qoriq_driver);
MODULE_DESCRIPTION("Freescale QorIQ AHCI SATA platform driver");
MODULE_AUTHOR("Tang Yuantian <Yuantian.Tang@freescale.com>");
MODULE_LICENSE("GPL");
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