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alistair23-linux/drivers/ata/ahci_qoriq.c
Tang Yuantian 1ce788d242 ahci: qoriq: Revert "ahci: qoriq: Disable NCQ on ls2080a SoC" 
This reverts commit 640847298e ("ahci: qoriq: Disable NCQ
on ls2080a SoC")

The erratum has been fixed in ls2080a v2.0 and later soc.
In reality, customer will not get any ls2080a v1.0 soc. Neither apply
to any products. So reverting this commit won't create any side effect.

Blacklisting v2.0 could also be a option, but that needs to check the
soc version which is not suitable in the driver.

Signed-off-by: Tang Yuantian <yuantian.tang@nxp.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
2016-09-30 10:28:51 +02:00

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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
enum ahci_qoriq_type {
AHCI_LS1021A,
AHCI_LS1043A,
AHCI_LS2080A,
};
struct ahci_qoriq_priv {
struct ccsr_ahci *reg_base;
enum ahci_qoriq_type type;
void __iomem *ecc_addr;
};
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},
{},
};
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:
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);
writel(AHCI_PORT_AXICC_CFG, reg_base + LS1021A_AXICC_ADDR);
break;
case AHCI_LS1043A:
writel(AHCI_PORT_PHY_1_CFG, reg_base + PORT_PHY1);
writel(AHCI_PORT_TRANS_CFG, reg_base + PORT_TRANS);
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);
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;
if (qoriq_priv->type == AHCI_LS1021A) {
res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
"sata-ecc");
qoriq_priv->ecc_addr = devm_ioremap_resource(dev, res);
if (IS_ERR(qoriq_priv->ecc_addr))
return PTR_ERR(qoriq_priv->ecc_addr);
}
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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