1 files changed, 299 insertions, 0 deletions
diff --git a/drivers/phy/marvell/phy-berlin-sata.c b/drivers/phy/marvell/phy-berlin-sata.c
new file mode 100644
index 000000000000..2c7a57f2d595
--- /dev/null
+++ b/drivers/phy/marvell/phy-berlin-sata.c
@@ -0,0 +1,299 @@
+/*
+ * Marvell Berlin SATA PHY driver
+ *
+ * Copyright (C) 2014 Marvell Technology Group Ltd.
+ *
+ * Antoine Ténart <antoine.tenart@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/clk.h>
+#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 PORT_SCR_CTL		0x2c
+#define PORT_VSR_ADDR		0x78
+#define PORT_VSR_DATA		0x7c
+
+#define CONTROL_REGISTER	0x0
+#define MBUS_SIZE_CONTROL	0x4
+
+#define POWER_DOWN_PHY0			BIT(6)
+#define POWER_DOWN_PHY1			BIT(14)
+#define MBUS_WRITE_REQUEST_SIZE_128	(BIT(2) << 16)
+#define MBUS_READ_REQUEST_SIZE_128	(BIT(2) << 19)
+
+#define BG2_PHY_BASE		0x080
+#define BG2Q_PHY_BASE		0x200
+
+/* register 0x01 */
+#define REF_FREF_SEL_25		BIT(0)
+#define PHY_MODE_SATA		(0x0 << 5)
+
+/* register 0x02 */
+#define USE_MAX_PLL_RATE	BIT(12)
+
+/* register 0x23 */
+#define DATA_BIT_WIDTH_10	(0x0 << 10)
+#define DATA_BIT_WIDTH_20	(0x1 << 10)
+#define DATA_BIT_WIDTH_40	(0x2 << 10)
+
+/* register 0x25 */
+#define PHY_GEN_MAX_1_5		(0x0 << 10)
+#define PHY_GEN_MAX_3_0		(0x1 << 10)
+#define PHY_GEN_MAX_6_0		(0x2 << 10)
+
+struct phy_berlin_desc {
+	struct phy	*phy;
+	u32		power_bit;
+	unsigned	index;
+};
+
+struct phy_berlin_priv {
+	void __iomem		*base;
+	spinlock_t		lock;
+	struct clk		*clk;
+	struct phy_berlin_desc	**phys;
+	unsigned		nphys;
+	u32			phy_base;
+};
+
+static inline void phy_berlin_sata_reg_setbits(void __iomem *ctrl_reg,
+			       u32 phy_base, u32 reg, u32 mask, u32 val)
+{
+	u32 regval;
+
+	/* select register */
+	writel(phy_base + reg, ctrl_reg + PORT_VSR_ADDR);
+
+	/* set bits */
+	regval = readl(ctrl_reg + PORT_VSR_DATA);
+	regval &= ~mask;
+	regval |= val;
+	writel(regval, ctrl_reg + PORT_VSR_DATA);
+}
+
+static int phy_berlin_sata_power_on(struct phy *phy)
+{
+	struct phy_berlin_desc *desc = phy_get_drvdata(phy);
+	struct phy_berlin_priv *priv = dev_get_drvdata(phy->dev.parent);
+	void __iomem *ctrl_reg = priv->base + 0x60 + (desc->index * 0x80);
+	u32 regval;
+
+	clk_prepare_enable(priv->clk);
+
+	spin_lock(&priv->lock);
+
+	/* Power on PHY */
+	writel(CONTROL_REGISTER, priv->base + HOST_VSA_ADDR);
+	regval = readl(priv->base + HOST_VSA_DATA);
+	regval &= ~desc->power_bit;
+	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);
+
+	/* set PHY mode and ref freq to 25 MHz */
+	phy_berlin_sata_reg_setbits(ctrl_reg, priv->phy_base, 0x01,
+				    0x00ff, REF_FREF_SEL_25 | PHY_MODE_SATA);
+
+	/* set PHY up to 6 Gbps */
+	phy_berlin_sata_reg_setbits(ctrl_reg, priv->phy_base, 0x25,
+				    0x0c00, PHY_GEN_MAX_6_0);
+
+	/* set 40 bits width */
+	phy_berlin_sata_reg_setbits(ctrl_reg, priv->phy_base, 0x23,
+				    0x0c00, DATA_BIT_WIDTH_40);
+
+	/* use max pll rate */
+	phy_berlin_sata_reg_setbits(ctrl_reg, priv->phy_base, 0x02,
+				    0x0000, USE_MAX_PLL_RATE);
+
+	/* set Gen3 controller speed */
+	regval = readl(ctrl_reg + PORT_SCR_CTL);
+	regval &= ~GENMASK(7, 4);
+	regval |= 0x30;
+	writel(regval, ctrl_reg + PORT_SCR_CTL);
+
+	spin_unlock(&priv->lock);
+
+	clk_disable_unprepare(priv->clk);
+
+	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 = dev_get_drvdata(phy->dev.parent);
+	u32 regval;
+
+	clk_prepare_enable(priv->clk);
+
+	spin_lock(&priv->lock);
+
+	/* Power down PHY */
+	writel(CONTROL_REGISTER, priv->base + HOST_VSA_ADDR);
+	regval = readl(priv->base + HOST_VSA_DATA);
+	regval |= desc->power_bit;
+	writel(regval, priv->base + HOST_VSA_DATA);
+
+	spin_unlock(&priv->lock);
+
+	clk_disable_unprepare(priv->clk);
+
+	return 0;
+}
+
+static struct phy *phy_berlin_sata_phy_xlate(struct device *dev,
+					     struct of_phandle_args *args)
+{
+	struct phy_berlin_priv *priv = dev_get_drvdata(dev);
+	int i;
+
+	if (WARN_ON(args->args[0] >= priv->nphys))
+		return ERR_PTR(-ENODEV);
+
+	for (i = 0; i < priv->nphys; i++) {
+		if (priv->phys[i]->index == args->args[0])
+			break;
+	}
+
+	if (i == priv->nphys)
+		return ERR_PTR(-ENODEV);
+
+	return priv->phys[i]->phy;
+}
+
+static const 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 u32 phy_berlin_power_down_bits[] = {
+	POWER_DOWN_PHY0,
+	POWER_DOWN_PHY1,
+};
+
+static int phy_berlin_sata_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct device_node *child;
+	struct phy *phy;
+	struct phy_provider *phy_provider;
+	struct phy_berlin_priv *priv;
+	struct resource *res;
+	int ret, i = 0;
+	u32 phy_id;
+
+	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res)
+		return -EINVAL;
+
+	priv->base = devm_ioremap(dev, res->start, resource_size(res));
+	if (!priv->base)
+		return -ENOMEM;
+
+	priv->clk = devm_clk_get(dev, NULL);
+	if (IS_ERR(priv->clk))
+		return PTR_ERR(priv->clk);
+
+	priv->nphys = of_get_child_count(dev->of_node);
+	if (priv->nphys == 0)
+		return -ENODEV;
+
+	priv->phys = devm_kcalloc(dev, priv->nphys, sizeof(*priv->phys),
+				  GFP_KERNEL);
+	if (!priv->phys)
+		return -ENOMEM;
+
+	if (of_device_is_compatible(dev->of_node, "marvell,berlin2-sata-phy"))
+		priv->phy_base = BG2_PHY_BASE;
+	else
+		priv->phy_base = BG2Q_PHY_BASE;
+
+	dev_set_drvdata(dev, priv);
+	spin_lock_init(&priv->lock);
+
+	for_each_available_child_of_node(dev->of_node, child) {
+		struct phy_berlin_desc *phy_desc;
+
+		if (of_property_read_u32(child, "reg", &phy_id)) {
+			dev_err(dev, "missing reg property in node %s\n",
+				child->name);
+			ret = -EINVAL;
+			goto put_child;
+		}
+
+		if (phy_id >= ARRAY_SIZE(phy_berlin_power_down_bits)) {
+			dev_err(dev, "invalid reg in node %s\n", child->name);
+			ret = -EINVAL;
+			goto put_child;
+		}
+
+		phy_desc = devm_kzalloc(dev, sizeof(*phy_desc), GFP_KERNEL);
+		if (!phy_desc) {
+			ret = -ENOMEM;
+			goto put_child;
+		}
+
+		phy = devm_phy_create(dev, NULL, &phy_berlin_sata_ops);
+		if (IS_ERR(phy)) {
+			dev_err(dev, "failed to create PHY %d\n", phy_id);
+			ret = PTR_ERR(phy);
+			goto put_child;
+		}
+
+		phy_desc->phy = phy;
+		phy_desc->power_bit = phy_berlin_power_down_bits[phy_id];
+		phy_desc->index = phy_id;
+		phy_set_drvdata(phy, phy_desc);
+
+		priv->phys[i++] = phy_desc;
+
+		/* Make sure the PHY is off */
+		phy_berlin_sata_power_off(phy);
+	}
+
+	phy_provider =
+		devm_of_phy_provider_register(dev, phy_berlin_sata_phy_xlate);
+	return PTR_ERR_OR_ZERO(phy_provider);
+put_child:
+	of_node_put(child);
+	return ret;
+}
+
+static const struct of_device_id phy_berlin_sata_of_match[] = {
+	{ .compatible = "marvell,berlin2-sata-phy" },
+	{ .compatible = "marvell,berlin2q-sata-phy" },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, phy_berlin_sata_of_match);
+
+static struct platform_driver phy_berlin_sata_driver = {
+	.probe	= phy_berlin_sata_probe,
+	.driver	= {
+		.name		= "phy-berlin-sata",
+		.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@free-electrons.com>");
+MODULE_LICENSE("GPL v2");