You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
114 lines
3.0 KiB
114 lines
3.0 KiB
/* |
|
* 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); |
|
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");
|
|
|