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:
parent
fd990556f0
commit
ae8723f8a9
3 changed files with 124 additions and 0 deletions
|
@ -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
|
||||
|
|
|
@ -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
114
drivers/ata/ahci_da850.c
Normal file
|
@ -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");
|
Loading…
Reference in a new issue