The Berlin SoC has a two SATA ports. Add a PHY driver to handle them. Signed-off-by: Antoine Ténart <antoine.tenart@xxxxxxxxxxxxxxxxxx> --- drivers/phy/Kconfig | 5 ++ drivers/phy/Makefile | 1 + drivers/phy/phy-berlin-sata.c | 179 ++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 185 insertions(+) create mode 100644 drivers/phy/phy-berlin-sata.c diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig index 4906c27fa3bd..b31b1986fda4 100644 --- a/drivers/phy/Kconfig +++ b/drivers/phy/Kconfig @@ -15,6 +15,11 @@ config GENERIC_PHY phy users can obtain reference to the PHY. All the users of this framework should select this config. +config PHY_BERLIN_SATA + bool + depends on ARCH_BERLIN && OF + select GENERIC_PHY + config PHY_EXYNOS_MIPI_VIDEO tristate "S5P/EXYNOS SoC series MIPI CSI-2/DSI PHY driver" depends on HAS_IOMEM diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile index 7728518572a4..40278706ac1b 100644 --- a/drivers/phy/Makefile +++ b/drivers/phy/Makefile @@ -3,6 +3,7 @@ # obj-$(CONFIG_GENERIC_PHY) += phy-core.o +obj-$(CONFIG_PHY_BERLIN_SATA) += phy-berlin-sata.o obj-$(CONFIG_BCM_KONA_USB2_PHY) += phy-bcm-kona-usb2.o obj-$(CONFIG_PHY_EXYNOS_DP_VIDEO) += phy-exynos-dp-video.o obj-$(CONFIG_PHY_EXYNOS_MIPI_VIDEO) += phy-exynos-mipi-video.o diff --git a/drivers/phy/phy-berlin-sata.c b/drivers/phy/phy-berlin-sata.c new file mode 100644 index 000000000000..f20f5ece1a7f --- /dev/null +++ b/drivers/phy/phy-berlin-sata.c @@ -0,0 +1,179 @@ +/* + * Marvell Berlin SATA PHY driver + * + * Copyright (C) 2014 Marvell Technology Group Ltd. + * + * Antoine Ténart <antoine.tenart@xxxxxxxxxxxxxxxxxx> + * + * 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/module.h> +#include <linux/phy/phy.h> +#include <linux/io.h> +#include <linux/platform_device.h> + +#define HOST_VSA_ADDR 0x0 +#define HOST_VSA_DATA 0x4 + +#define CONTROL_REGISTER 0x0 +#define MBUS_SIZE_CONTROL 0x4 + +#define POWER_DOWN_SATA0 BIT(6) +#define POWER_DOWN_SATA1 BIT(14) +#define MBUS_WRITE_REQUEST_SIZE_128 (BIT(2) << 16) +#define MBUS_READ_REQUEST_SIZE_128 (BIT(2) << 19) + +#define BERLIN_SATA_PHY_NB 2 + +#define to_berlin_sata_phy_priv(desc) \ + container_of((desc), struct priv, phys[(desc)->index]) + +struct phy_desc { + struct phy *phy; + u32 val; + unsigned index; +}; + +struct priv { + void __iomem *base; + spinlock_t lock; + struct phy_desc phys[BERLIN_SATA_PHY_NB]; +}; + +static int phy_berlin_sata_power_on(struct phy *phy) +{ + struct phy_desc *desc = phy_get_drvdata(phy); + struct priv *priv = to_berlin_sata_phy_priv(desc); + u32 regval; + + spin_lock(&priv->lock); + + /* Power up PHY */ + writel(CONTROL_REGISTER, priv->base + HOST_VSA_ADDR); + regval = readl(priv->base + HOST_VSA_DATA); + regval &= ~(desc->val); + writel(regval, priv->base + HOST_VSA_DATA); + + /* Configure MBus */ + writel(MBUS_SIZE_CONTROL, priv->base + HOST_VSA_ADDR); + regval = readl(priv->base + HOST_VSA_DATA); + regval |= MBUS_WRITE_REQUEST_SIZE_128 | MBUS_READ_REQUEST_SIZE_128; + writel(regval, priv->base + HOST_VSA_DATA); + + spin_unlock(&priv->lock); + + return 0; +} + +static int phy_berlin_sata_power_off(struct phy *phy) +{ + struct phy_desc *desc = phy_get_drvdata(phy); + struct priv *priv = to_berlin_sata_phy_priv(desc); + u32 regval; + + spin_lock(&priv->lock); + + /* Power down PHY */ + writel(CONTROL_REGISTER, priv->base + HOST_VSA_ADDR); + regval = readl(priv->base + HOST_VSA_DATA); + regval |= desc->val; + writel(regval, priv->base + HOST_VSA_DATA); + + spin_unlock(&priv->lock); + + return 0; +} + +static struct phy *berlin_sata_phy_xlate(struct device *dev, + struct of_phandle_args *args) +{ + struct priv *priv = dev_get_drvdata(dev); + + if (WARN_ON(args->args[0] >= BERLIN_SATA_PHY_NB)) + return ERR_PTR(-ENODEV); + + return priv->phys[args->args[0]].phy; +} + +static struct phy_ops phy_berlin_sata_ops = { + .power_on = phy_berlin_sata_power_on, + .power_off = phy_berlin_sata_power_off, + .owner = THIS_MODULE, +}; + +static struct phy_desc desc[] = { + { .val = POWER_DOWN_SATA0 }, + { .val = POWER_DOWN_SATA1 }, + { }, +}; + +static int phy_berlin_sata_probe(struct platform_device *pdev) +{ + struct phy *phy; + struct phy_provider *phy_provider; + struct priv *priv; + struct resource *res; + int i; + + priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + priv->base = devm_ioremap(&pdev->dev, res->start, resource_size(res)); + if (IS_ERR(priv->base)) + return PTR_ERR(priv->base); + + phy = devm_phy_create(&pdev->dev, &phy_berlin_sata_ops, NULL); + if (IS_ERR(phy)) + return PTR_ERR(phy); + + dev_set_drvdata(&pdev->dev, priv); + spin_lock_init(&priv->lock); + + for (i = 0; i < BERLIN_SATA_PHY_NB; i++) { + struct phy *phy = devm_phy_create(&pdev->dev, + &phy_berlin_sata_ops, NULL); + if (IS_ERR(phy)) { + dev_err(&pdev->dev, "failed to create PHY %d\n", i); + return PTR_ERR(phy); + } + + priv->phys[i].phy = phy; + priv->phys[i].val = desc[i].val; + priv->phys[i].index = i; + phy_set_drvdata(phy, &priv->phys[i]); + + /* Make sure the PHY is off */ + phy_berlin_sata_power_off(phy); + } + + phy_provider = devm_of_phy_provider_register(&pdev->dev, + berlin_sata_phy_xlate); + if (IS_ERR(phy_provider)) + return PTR_ERR(phy_provider); + + return 0; +} + +static const struct of_device_id phy_berlin_sata_of_match[] = { + { .compatible = "marvell,berlin-sata-phy" }, + { }, +}; + +static struct platform_driver phy_berlin_sata_driver = { + .probe = phy_berlin_sata_probe, + .driver = { + .name = "phy-berlin-sata", + .owner = THIS_MODULE, + .of_match_table = phy_berlin_sata_of_match, + }, +}; +module_platform_driver(phy_berlin_sata_driver); + +MODULE_DESCRIPTION("Marvell Berlin SATA PHY driver"); +MODULE_AUTHOR("Antoine Ténart <antoine.tenart@xxxxxxxxxxxxxxxxxx>"); +MODULE_LICENSE("GPL"); -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html