ata: add new-style AHCI platform driver for DaVinci DA850 AHCI controller

Add the new ahci_da850 host driver.

Platform changes needed to make DaVinci DA850 SATA AHCI support
fully functional are in the separate "ARM: davinci: da850: update
SATA AHCI support" commit.

Please note that this driver doesn't have the superfluous clock
control code as clock is already handled by the generic AHCI
platform library code.

Cc: Sekhar Nori <nsekhar@ti.com>
Cc: Kevin Hilman <khilman@deeprootsystems.com>
Cc: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Bartlomiej Zolnierkiewicz 2014-03-25 19:51:40 +01:00 committed by Tejun Heo
parent fd990556f0
commit ae8723f8a9
3 changed files with 124 additions and 0 deletions

View file

@ -97,6 +97,15 @@ config SATA_AHCI_PLATFORM
If unsure, say N.
config AHCI_DA850
tristate "DaVinci DA850 AHCI SATA support"
depends on ARCH_DAVINCI_DA850
help
This option enables support for the DaVinci DA850 SoC's
onboard AHCI SATA.
If unsure, say N.
config AHCI_ST
tristate "ST AHCI SATA support"
depends on ARCH_STI

View file

@ -10,6 +10,7 @@ obj-$(CONFIG_SATA_INIC162X) += sata_inic162x.o
obj-$(CONFIG_SATA_SIL24) += sata_sil24.o
obj-$(CONFIG_SATA_DWC) += sata_dwc_460ex.o
obj-$(CONFIG_SATA_HIGHBANK) += sata_highbank.o libahci.o
obj-$(CONFIG_AHCI_DA850) += ahci_da850.o libahci.o libahci_platform.o
obj-$(CONFIG_AHCI_IMX) += ahci_imx.o libahci.o libahci_platform.o
obj-$(CONFIG_AHCI_SUNXI) += ahci_sunxi.o libahci.o libahci_platform.o
obj-$(CONFIG_AHCI_ST) += ahci_st.o libahci.o libahci_platform.o

114
drivers/ata/ahci_da850.c Normal file
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@ -0,0 +1,114 @@
/*
* DaVinci DA850 AHCI SATA platform driver
*
* 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/device.h>
#include <linux/platform_device.h>
#include <linux/libata.h>
#include <linux/ahci_platform.h>
#include "ahci.h"
/* SATA PHY Control Register offset from AHCI base */
#define SATA_P0PHYCR_REG 0x178
#define SATA_PHY_MPY(x) ((x) << 0)
#define SATA_PHY_LOS(x) ((x) << 6)
#define SATA_PHY_RXCDR(x) ((x) << 10)
#define SATA_PHY_RXEQ(x) ((x) << 13)
#define SATA_PHY_TXSWING(x) ((x) << 19)
#define SATA_PHY_ENPLL(x) ((x) << 31)
/*
* The multiplier needed for 1.5GHz PLL output.
*
* NOTE: This is currently hardcoded to be suitable for 100MHz crystal
* frequency (which is used by DA850 EVM board) and may need to be changed
* if you would like to use this driver on some other board.
*/
#define DA850_SATA_CLK_MULTIPLIER 7
static void da850_sata_init(struct device *dev, void __iomem *pwrdn_reg,
void __iomem *ahci_base)
{
unsigned int val;
/* Enable SATA clock receiver */
val = readl(pwrdn_reg);
val &= ~BIT(0);
writel(val, pwrdn_reg);
val = SATA_PHY_MPY(DA850_SATA_CLK_MULTIPLIER + 1) | SATA_PHY_LOS(1) |
SATA_PHY_RXCDR(4) | SATA_PHY_RXEQ(1) | SATA_PHY_TXSWING(3) |
SATA_PHY_ENPLL(1);
writel(val, ahci_base + SATA_P0PHYCR_REG);
}
static const struct ata_port_info ahci_da850_port_info = {
.flags = AHCI_FLAG_COMMON,
.pio_mask = ATA_PIO4,
.udma_mask = ATA_UDMA6,
.port_ops = &ahci_platform_ops,
};
static int ahci_da850_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct ahci_host_priv *hpriv;
struct resource *res;
void __iomem *pwrdn_reg;
int rc;
hpriv = ahci_platform_get_resources(pdev);
if (IS_ERR(hpriv))
return PTR_ERR(hpriv);
rc = ahci_platform_enable_resources(hpriv);
if (rc)
return rc;
res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
if (!res)
goto disable_resources;
pwrdn_reg = devm_ioremap(dev, res->start, resource_size(res));
if (!pwrdn_reg)
goto disable_resources;
da850_sata_init(dev, pwrdn_reg, hpriv->mmio);
rc = ahci_platform_init_host(pdev, hpriv, &ahci_da850_port_info, 0, 0);
if (rc)
goto disable_resources;
return 0;
disable_resources:
ahci_platform_disable_resources(hpriv);
return rc;
}
static SIMPLE_DEV_PM_OPS(ahci_da850_pm_ops, ahci_platform_suspend,
ahci_platform_resume);
static struct platform_driver ahci_da850_driver = {
.probe = ahci_da850_probe,
.remove = ata_platform_remove_one,
.driver = {
.name = "ahci_da850",
.owner = THIS_MODULE,
.pm = &ahci_da850_pm_ops,
},
};
module_platform_driver(ahci_da850_driver);
MODULE_DESCRIPTION("DaVinci DA850 AHCI SATA platform driver");
MODULE_AUTHOR("Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>");
MODULE_LICENSE("GPL");