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/*
* AHCI glue platform driver for Marvell EBU SOCs
*
* Copyright (C) 2014 Marvell
*
* Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
* Marcin Wojtas <mw@semihalf.com>
*
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without any
* warranty of any kind, whether express or implied.
*/
#include <linux/ahci_platform.h>
#include <linux/kernel.h>
#include <linux/mbus.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include "ahci.h"
#define DRV_NAME "ahci-mvebu"
#define AHCI_VENDOR_SPECIFIC_0_ADDR 0xa0
#define AHCI_VENDOR_SPECIFIC_0_DATA 0xa4
#define AHCI_WINDOW_CTRL(win) (0x60 + ((win) << 4))
#define AHCI_WINDOW_BASE(win) (0x64 + ((win) << 4))
#define AHCI_WINDOW_SIZE(win) (0x68 + ((win) << 4))
static void ahci_mvebu_mbus_config(struct ahci_host_priv *hpriv,
const struct mbus_dram_target_info *dram)
{
int i;
for (i = 0; i < 4; i++) {
writel(0, hpriv->mmio + AHCI_WINDOW_CTRL(i));
writel(0, hpriv->mmio + AHCI_WINDOW_BASE(i));
writel(0, hpriv->mmio + AHCI_WINDOW_SIZE(i));
}
for (i = 0; i < dram->num_cs; i++) {
const struct mbus_dram_window *cs = dram->cs + i;
writel((cs->mbus_attr << 8) |
(dram->mbus_dram_target_id << 4) | 1,
hpriv->mmio + AHCI_WINDOW_CTRL(i));
writel(cs->base >> 16, hpriv->mmio + AHCI_WINDOW_BASE(i));
writel(((cs->size - 1) & 0xffff0000),
hpriv->mmio + AHCI_WINDOW_SIZE(i));
}
}
static void ahci_mvebu_regret_option(struct ahci_host_priv *hpriv)
{
/*
* Enable the regret bit to allow the SATA unit to regret a
* request that didn't receive an acknowlegde and avoid a
* deadlock
*/
writel(0x4, hpriv->mmio + AHCI_VENDOR_SPECIFIC_0_ADDR);
writel(0x80, hpriv->mmio + AHCI_VENDOR_SPECIFIC_0_DATA);
}
/**
* ahci_mvebu_stop_engine
*
* @ap: Target ata port
*
* Errata Ref#226 - SATA Disk HOT swap issue when connected through
* Port Multiplier in FIS-based Switching mode.
*
* To avoid the issue, according to design, the bits[11:8, 0] of
* register PxFBS are cleared when Port Command and Status (0x18) bit[0]
* changes its value from 1 to 0, i.e. falling edge of Port
* Command and Status bit[0] sends PULSE that resets PxFBS
* bits[11:8; 0].
*
* This function is used to override function of "ahci_stop_engine"
* from libahci.c by adding the mvebu work around(WA) to save PxFBS
* value before the PxCMD ST write of 0, then restore PxFBS value.
*
* Return: 0 on success; Error code otherwise.
*/
static int ahci_mvebu_stop_engine(struct ata_port *ap)
{
void __iomem *port_mmio = ahci_port_base(ap);
u32 tmp, port_fbs;
tmp = readl(port_mmio + PORT_CMD);
/* check if the HBA is idle */
if ((tmp & (PORT_CMD_START | PORT_CMD_LIST_ON)) == 0)
return 0;
/* save the port PxFBS register for later restore */
port_fbs = readl(port_mmio + PORT_FBS);
/* setting HBA to idle */
tmp &= ~PORT_CMD_START;
writel(tmp, port_mmio + PORT_CMD);
/*
* bit #15 PxCMD signal doesn't clear PxFBS,
* restore the PxFBS register right after clearing the PxCMD ST,
* no need to wait for the PxCMD bit #15.
*/
writel(port_fbs, port_mmio + PORT_FBS);
/* wait for engine to stop. This could be as long as 500 msec */
tmp = ata_wait_register(ap, port_mmio + PORT_CMD,
PORT_CMD_LIST_ON, PORT_CMD_LIST_ON, 1, 500);
if (tmp & PORT_CMD_LIST_ON)
return -EIO;
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int ahci_mvebu_suspend(struct platform_device *pdev, pm_message_t state)
{
return ahci_platform_suspend_host(&pdev->dev);
}
static int ahci_mvebu_resume(struct platform_device *pdev)
{
struct ata_host *host = platform_get_drvdata(pdev);
struct ahci_host_priv *hpriv = host->private_data;
const struct mbus_dram_target_info *dram;
dram = mv_mbus_dram_info();
if (dram)
ahci_mvebu_mbus_config(hpriv, dram);
ahci_mvebu_regret_option(hpriv);
return ahci_platform_resume_host(&pdev->dev);
}
#else
#define ahci_mvebu_suspend NULL
#define ahci_mvebu_resume NULL
#endif
static const struct ata_port_info ahci_mvebu_port_info = {
.flags = AHCI_FLAG_COMMON,
.pio_mask = ATA_PIO4,
.udma_mask = ATA_UDMA6,
.port_ops = &ahci_platform_ops,
};
static struct scsi_host_template ahci_platform_sht = {
AHCI_SHT(DRV_NAME),
};
static int ahci_mvebu_probe(struct platform_device *pdev)
{
struct ahci_host_priv *hpriv;
const struct mbus_dram_target_info *dram;
int rc;
hpriv = ahci_platform_get_resources(pdev, 0);
if (IS_ERR(hpriv))
return PTR_ERR(hpriv);
rc = ahci_platform_enable_resources(hpriv);
if (rc)
return rc;
hpriv->stop_engine = ahci_mvebu_stop_engine;
if (of_device_is_compatible(pdev->dev.of_node,
"marvell,armada-380-ahci")) {
dram = mv_mbus_dram_info();
if (!dram)
return -ENODEV;
ahci_mvebu_mbus_config(hpriv, dram);
ahci_mvebu_regret_option(hpriv);
}
rc = ahci_platform_init_host(pdev, hpriv, &ahci_mvebu_port_info,
&ahci_platform_sht);
if (rc)
goto disable_resources;
return 0;
disable_resources:
ahci_platform_disable_resources(hpriv);
return rc;
}
static const struct of_device_id ahci_mvebu_of_match[] = {
{ .compatible = "marvell,armada-380-ahci", },
{ .compatible = "marvell,armada-3700-ahci", },
{ },
};
MODULE_DEVICE_TABLE(of, ahci_mvebu_of_match);
/*
* We currently don't provide power management related operations,
* since there is no suspend/resume support at the platform level for
* Armada 38x for the moment.
*/
static struct platform_driver ahci_mvebu_driver = {
.probe = ahci_mvebu_probe,
.remove = ata_platform_remove_one,
.suspend = ahci_mvebu_suspend,
.resume = ahci_mvebu_resume,
.driver = {
.name = DRV_NAME,
.of_match_table = ahci_mvebu_of_match,
},
};
module_platform_driver(ahci_mvebu_driver);
MODULE_DESCRIPTION("Marvell EBU AHCI SATA driver");
MODULE_AUTHOR("Thomas Petazzoni <thomas.petazzoni@free-electrons.com>, Marcin Wojtas <mw@semihalf.com>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:ahci_mvebu");
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