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Message-id: <1382365111-6533-5-git-send-email-t.stanislaws@samsung.com>
Date: Mon, 21 Oct 2013 16:18:23 +0200
From: Tomasz Stanislawski <t.stanislaws@...sung.com>
To: devicetree@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
linux-kernel@...r.kernel.org
Cc: dri-devel@...ts.freedesktop.org, kyungmin.park@...sung.com,
t.figa@...sung.com, kishon@...com, sw0312.kim@...sung.com,
inki.dae@...sung.com, rahul.sharma@...sung.com,
kgene.kim@...sung.com, s.nawrocki@...sung.com,
thomas.abraham@...aro.org, mturquette@...aro.org,
Tomasz Stanislawski <t.stanislaws@...sung.com>
Subject: [RFC 04/12] phy: Add simple-phy driver
Add simple-phy driver to support a single register
PHY interfaces present on Exynos4 SoC.
Signed-off-by: Tomasz Stanislawski <t.stanislaws@...sung.com>
---
drivers/phy/Kconfig | 5 ++
drivers/phy/Makefile | 1 +
drivers/phy/phy-simple.c | 128 ++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 134 insertions(+)
create mode 100644 drivers/phy/phy-simple.c
diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
index ac239ac..619c657 100644
--- a/drivers/phy/Kconfig
+++ b/drivers/phy/Kconfig
@@ -38,4 +38,9 @@ config TWL4030_USB
This transceiver supports high and full speed devices plus,
in host mode, low speed.
+config PHY_SIMPLE
+ tristate "Simple PHY driver"
+ help
+ Support for PHY controllers configured using single register.
+
endmenu
diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
index 0dd8a98..3d68e19 100644
--- a/drivers/phy/Makefile
+++ b/drivers/phy/Makefile
@@ -5,3 +5,4 @@
obj-$(CONFIG_GENERIC_PHY) += phy-core.o
obj-$(CONFIG_OMAP_USB2) += phy-omap-usb2.o
obj-$(CONFIG_TWL4030_USB) += phy-twl4030-usb.o
+obj-$(CONFIG_PHY_SIMPLE) += phy-simple.o
diff --git a/drivers/phy/phy-simple.c b/drivers/phy/phy-simple.c
new file mode 100644
index 0000000..4a28af7
--- /dev/null
+++ b/drivers/phy/phy-simple.c
@@ -0,0 +1,128 @@
+/*
+ * Simple PHY driver
+ *
+ * Copyright (C) 2013 Samsung Electronics Co., Ltd.
+ * Author: Tomasz Stanislawski <t.stanislaws@...sung.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/phy/phy.h>
+#include <linux/platform_device.h>
+#include <linux/spinlock.h>
+
+struct simple_phy {
+ spinlock_t slock;
+ u32 on_value;
+ u32 off_value;
+ u32 mask;
+ void __iomem *regs;
+};
+
+static int sphy_set(struct simple_phy *sphy, bool on)
+{
+ u32 reg;
+
+ spin_lock(&sphy->slock);
+
+ reg = readl(sphy->regs);
+ reg &= ~sphy->mask;
+ reg |= sphy->mask & (on ? sphy->on_value : sphy->off_value);
+ writel(reg, sphy->regs);
+
+ spin_unlock(&sphy->slock);
+
+ return 0;
+}
+
+static int simple_phy_power_on(struct phy *phy)
+{
+ return sphy_set(phy_get_drvdata(phy), 1);
+}
+
+static int simple_phy_power_off(struct phy *phy)
+{
+ return sphy_set(phy_get_drvdata(phy), 0);
+}
+
+static struct phy_ops simple_phy_ops = {
+ .power_on = simple_phy_power_on,
+ .power_off = simple_phy_power_off,
+ .owner = THIS_MODULE,
+};
+
+static int simple_phy_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct simple_phy *sphy;
+ struct resource *res;
+ struct phy_provider *phy_provider;
+ struct phy *phy;
+
+ sphy = devm_kzalloc(dev, sizeof(*sphy), GFP_KERNEL);
+ if (!sphy)
+ return -ENOMEM;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+
+ sphy->regs = devm_ioremap_resource(dev, res);
+ if (IS_ERR(sphy->regs)) {
+ dev_err(dev, "failed to ioremap registers\n");
+ return PTR_ERR(sphy->regs);
+ }
+
+ spin_lock_init(&sphy->slock);
+
+ phy_provider = devm_of_phy_provider_register(dev, NULL);
+ if (IS_ERR(phy_provider)) {
+ dev_err(dev, "failed to register PHY provider\n");
+ return PTR_ERR(phy_provider);
+ }
+
+ phy = devm_phy_create(dev, &simple_phy_ops, NULL);
+ if (IS_ERR(phy)) {
+ dev_err(dev, "failed to create PHY\n");
+ return PTR_ERR(phy);
+ }
+
+ sphy->mask = 1;
+ sphy->on_value = ~0;
+ sphy->off_value = 0;
+
+ of_property_read_u32(dev->of_node, "mask", &sphy->mask);
+ of_property_read_u32(dev->of_node, "on-value", &sphy->on_value);
+ of_property_read_u32(dev->of_node, "off-value", &sphy->off_value);
+
+ phy_set_drvdata(phy, sphy);
+
+ dev_info(dev, "probe successful\n");
+
+ return 0;
+}
+
+static const struct of_device_id simple_phy_of_match[] = {
+ { .compatible = "simple-phy" },
+ { },
+};
+MODULE_DEVICE_TABLE(of, simple_phy_of_match);
+
+static struct platform_driver simple_phy_driver = {
+ .probe = simple_phy_probe,
+ .driver = {
+ .of_match_table = simple_phy_of_match,
+ .name = "simple-phy",
+ .owner = THIS_MODULE,
+ }
+};
+module_platform_driver(simple_phy_driver);
+
+MODULE_DESCRIPTION("Simple PHY driver");
+MODULE_AUTHOR("Tomasz Stanislawski <t.stanislaws@...sung.com>");
+MODULE_LICENSE("GPL v2");
--
1.7.9.5
--
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