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authorTomasz Stanislawski <t.stanislaws@samsung.com>2013-09-30 17:46:53 +0200
committerChanho Park <chanho61.park@samsung.com>2014-03-20 17:43:44 +0900
commit45f62157894a39e82502debfedf2851adac0d6ae (patch)
treee29ad650ebad3948680ae5357cb01212d1c3649f /drivers/phy
parentb6fa6633fa7e42d45bb604323b858a021bdd9f3c (diff)
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phy: Add exynos-phy driver
Add exynos-phy driver to support a single register PHY interfaces present on Exynos4 SoC. Signed-off-by: Tomasz Stanislawski <t.stanislaws@samsung.com> Change-Id: I1a2eeab876507e1e427fcb26782d060a1614852a
Diffstat (limited to 'drivers/phy')
-rw-r--r--drivers/phy/Kconfig5
-rw-r--r--drivers/phy/Makefile1
-rw-r--r--drivers/phy/exynos-phy.c152
3 files changed, 158 insertions, 0 deletions
diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
index bf63eb851be..62bd2cb29e6 100644
--- a/drivers/phy/Kconfig
+++ b/drivers/phy/Kconfig
@@ -42,4 +42,9 @@ config PHY_EXYNOS4212_USB
help
Enable USB PHY support for Exynos 4212
+config EXYNOS_PHY
+ tristate "Exynos PHY driver"
+ help
+ Support for PHY controllers on SoCs from Exynos family.
+
endmenu
diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
index d75f932c388..e56dd72ace2 100644
--- a/drivers/phy/Makefile
+++ b/drivers/phy/Makefile
@@ -7,3 +7,4 @@ obj-$(CONFIG_PHY_EXYNOS_MIPI_VIDEO) += phy-exynos-mipi-video.o
obj-$(CONFIG_PHY_EXYNOS_USB) += phy-exynos-usb.o
obj-$(CONFIG_PHY_EXYNOS4210_USB) += phy-exynos4210-usb.o
obj-$(CONFIG_PHY_EXYNOS4212_USB) += phy-exynos4212-usb.o
+obj-$(CONFIG_EXYNOS_PHY) += exynos-phy.o
diff --git a/drivers/phy/exynos-phy.c b/drivers/phy/exynos-phy.c
new file mode 100644
index 00000000000..46d5603b6d7
--- /dev/null
+++ b/drivers/phy/exynos-phy.c
@@ -0,0 +1,152 @@
+/*
+ * Exynos PHY driver
+ *
+ * Copyright (C) 2013 Samsung Electronics Co., Ltd.
+ * Author: Tomasz Stanislawski <t.stanislaws@samsung.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_device.h>
+#include <linux/phy/phy.h>
+
+#define EXYNOS_PHY_ENABLE (1 << 0)
+
+static int exynos_phy_power_on(struct phy *phy)
+{
+ void __iomem *reg = phy_get_drvdata(phy);
+ u32 val;
+
+ val = readl(reg);
+ val |= EXYNOS_PHY_ENABLE;
+ writel(val, reg);
+
+ return 0;
+}
+
+static int exynos_phy_power_off(struct phy *phy)
+{
+ void __iomem *reg = phy_get_drvdata(phy);
+ u32 val;
+
+ val = readl(reg);
+ val &= ~EXYNOS_PHY_ENABLE;
+ writel(val, reg);
+
+ return 0;
+}
+
+static struct phy_ops exynos_phy_ops = {
+ .power_on = exynos_phy_power_on,
+ .power_off = exynos_phy_power_off,
+ .owner = THIS_MODULE,
+};
+
+static const u32 exynos4210_offsets[] = {
+ 0x0700, /* HDMI_PHY */
+ 0x070C, /* DAC_PHY */
+ 0x0718, /* ADC_PHY */
+ 0x071C, /* PCIE_PHY */
+ 0x0720, /* SATA_PHY */
+ ~0, /* end mark */
+};
+
+static const u32 exynos4412_offsets[] = {
+ 0x0700, /* HDMI_PHY */
+ 0x0718, /* ADC_PHY */
+ ~0, /* end mark */
+};
+
+static const struct of_device_id exynos_phy_of_match[] = {
+ { .compatible = "exynos4210-phy", .data = exynos4210_offsets},
+ { .compatible = "exynos4412-phy", .data = exynos4412_offsets},
+ { },
+};
+MODULE_DEVICE_TABLE(of, exynos_phy_of_match);
+
+static struct phy *exynos_phy_xlate(struct device *dev,
+ struct of_phandle_args *args)
+{
+ struct phy **phys = dev_get_drvdata(dev);
+ int index = args->args[0];
+ int i;
+
+ /* verify if index is valid */
+ for (i = 0; i <= index; ++i)
+ if (!phys[i])
+ return ERR_PTR(-ENODEV);
+
+ return phys[index];
+}
+
+static int exynos_phy_probe(struct platform_device *pdev)
+{
+ const struct of_device_id *of_id = of_match_device(
+ of_match_ptr(exynos_phy_of_match), &pdev->dev);
+ const u32 *offsets = of_id->data;
+ int count;
+ struct device *dev = &pdev->dev;
+ struct phy **phys;
+ struct resource *res;
+ void __iomem *regs;
+ int i;
+ struct phy_provider *phy_provider;
+
+ /* count number of phys to create */
+ for (count = 0; offsets[count] != ~0; ++count)
+ ;
+
+ phys = devm_kzalloc(dev, (count + 1) * sizeof(phys[0]), GFP_KERNEL);
+ if (!phys)
+ return -ENOMEM;
+
+ dev_set_drvdata(dev, phys);
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+
+ regs = devm_ioremap(dev, res->start, res->end - res->start);
+ if (!regs) {
+ dev_err(dev, "failed to ioremap registers\n");
+ return -EFAULT;
+ }
+
+ /* NOTE: last entry in phys[] is NULL */
+ for (i = 0; i < count; ++i) {
+ phys[i] = devm_phy_create(dev, &exynos_phy_ops, NULL);
+ if (IS_ERR(phys[i])) {
+ dev_err(dev, "failed to create PHY %d\n", i);
+ return PTR_ERR(phys[i]);
+ }
+ phy_set_drvdata(phys[i], regs + offsets[i]);
+ }
+
+ phy_provider = devm_of_phy_provider_register(dev, exynos_phy_xlate);
+ if (IS_ERR(phy_provider)) {
+ dev_err(dev, "failed to register PHY provider\n");
+ return PTR_ERR(phy_provider);
+ }
+
+ dev_info(dev, "added %d phys\n", count);
+
+ return 0;
+}
+
+static struct platform_driver exynos_phy_driver = {
+ .probe = exynos_phy_probe,
+ .driver = {
+ .of_match_table = exynos_phy_of_match,
+ .name = "exynos-phy",
+ .owner = THIS_MODULE,
+ }
+};
+module_platform_driver(exynos_phy_driver);
+
+MODULE_DESCRIPTION("Exynos PHY driver");
+MODULE_AUTHOR("Tomasz Stanislawski <t.stanislaws@samsung.com>");
+MODULE_LICENSE("GPL v2");