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 | 180 ++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 186 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..b08f76329a34 --- /dev/null +++ b/drivers/phy/phy-berlin-sata.c @@ -0,0 +1,180 @@ +/* + * 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 phy_berlin_priv, phys[(desc)->index]) + +struct phy_berlin_desc { + struct phy *phy; + u32 val; + unsigned index; +}; + +struct phy_berlin_priv { + void __iomem *base; + spinlock_t lock; + struct phy_berlin_desc phys[BERLIN_SATA_PHY_NB]; +}; + +static int phy_berlin_sata_power_on(struct phy *phy) +{ + struct phy_berlin_desc *desc = phy_get_drvdata(phy); + struct phy_berlin_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_berlin_desc *desc = phy_get_drvdata(phy); + struct phy_berlin_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_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_berlin_desc desc[] = { + { .val = POWER_DOWN_SATA0 }, + { .val = POWER_DOWN_SATA1 }, + { }, +}; + +static int phy_berlin_sata_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct phy *phy; + struct phy_provider *phy_provider; + struct phy_berlin_priv *priv; + struct resource *res; + struct device_node *child; + u8 phy_id; + + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + priv->base = devm_ioremap(dev, res->start, resource_size(res)); + if (IS_ERR(priv->base)) + return PTR_ERR(priv->base); + + dev_set_drvdata(dev, priv); + spin_lock_init(&priv->lock); + + for_each_child_of_node(dev->of_node, child) { + if (of_property_read_u8(child, "reg", &phy_id)) + return -EINVAL; + + if (phy_id >= BERLIN_SATA_PHY_NB) { + dev_err(dev, "invalid reg in node %s\n", child->name); + return -EINVAL; + } + + phy = devm_phy_create(dev, &phy_berlin_sata_ops, NULL); + if (IS_ERR(phy)) { + dev_err(dev, "failed to create PHY for node %s\n", + child->name); + return PTR_ERR(phy); + } + + /* + * By default the PHY node is used to request and match a PHY. + * We describe one PHY per sub-node here. Use the right node. + */ + phy->dev.of_node = child; + + priv->phys[phy_id].phy = phy; + priv->phys[phy_id].val = desc[phy_id].val; + priv->phys[phy_id].index = phy_id; + phy_set_drvdata(phy, &priv->phys[phy_id]); + + /* Make sure the PHY is off */ + phy_berlin_sata_power_off(phy); + + phy_provider = devm_of_phy_provider_register(&phy->dev, + of_phy_simple_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 v2"); -- 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