[PATCH v3 1/6] phy: add a driver for the Berlin SATA PHY

[Antoine Ténart]

The Berlin SoC has a two SATA ports. Add a PHY driver to handle them.

Signed-off-by: Antoine Ténart <antoine.tenart at free-electrons.com>
---
 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 at free-electrons.com>
+ *
+ * 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 at free-electrons.com>");
+MODULE_LICENSE("GPL v2");
-- 
1.9.1