Hi,
On 01/15/2014 11:52 PM, Maxime Ripard wrote:
Hi Hans,
Please keep me in CC for all the Allwinner-related patches.
Ok will do.
On Tue, Jan 14, 2014 at 11:58:25PM +0100, Hans de Goede wrote:
The Allwinner A1x / A2x SoCs have 2 or 3 usb phys which are all accessed
through a single set of registers. Besides this there are also some other
phy related bits which need poking, which are per phy, but shared between the
ohci and ehci controllers, so these are also controlled from this new phy
driver.
Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>
---
.../devicetree/bindings/phy/sun4i-usb-phy.txt | 26 ++
drivers/phy/Kconfig | 11 +
drivers/phy/Makefile | 1 +
drivers/phy/phy-sun4i-usb.c | 318 +++++++++++++++++++++
4 files changed, 356 insertions(+)
create mode 100644 Documentation/devicetree/bindings/phy/sun4i-usb-phy.txt
create mode 100644 drivers/phy/phy-sun4i-usb.c
diff --git a/Documentation/devicetree/bindings/phy/sun4i-usb-phy.txt b/Documentation/devicetree/bindings/phy/sun4i-usb-phy.txt
new file mode 100644
index 0000000..6c54b3b
--- /dev/null
+++ b/Documentation/devicetree/bindings/phy/sun4i-usb-phy.txt
@@ -0,0 +1,26 @@
+Allwinner sun4i USB PHY
+-----------------------
+
+Required properties:
+- compatible : should be one of "allwinner,sun4i-a10-usb-phy",
It is sun4i-usb-phy.
For completeness sake: this has been discussed elsewhere and we've agreed upon
using sun4i-a10-foo for all compat strings.
+ "allwinner,sun5i-a13-usb-phy" or "allwinner,sun7i-a20-usb-phy"
+- reg : 2 or 3 register offset + length pairs, 1 phy base reg pair +
+ 1 pair for the pmu-irq register of each hcd
In which order they should be set? Maybe you should use reg-names here
to clarify things. From that documentation, I have no idea how I
should put the values if I just want the common stuff and the (for
example) usb1 configuration.
I've improved the doc text in my next revision.
+- #phy-cells : from the generic phy bindings, must be 1
+
+Optional properties:
+- clocks : phandle + clock specifier for the phy clock
+- clock-names : "usb_phy"
+- resets : a list of phandle + reset specifier pairs
+- reset-names : "usb0_reset", "usb1_reset", and / or "usb2_reset"
+
+Example:
+ usbphy: phy@0x01c13400 {
+ #phy-cells = <1>;
+ compatible = "allwinner,sun4i-a10-usb-phy";
+ reg = <0x01c13400 0x10 0x01c14800 0x4 0x01c1c800 0x4>;
If you prefer not to use reg-names after all, please put a comment
stating what each pair correspond to.
Fixed (added a comment).
+ clocks = <&usb_clk 8>;
+ clock-names = "usb_phy";
+ resets = <&usb_clk 1>, <&usb_clk 2>;
+ reset-names = "usb1_reset", "usb2_reset";
+ };
diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
index 330ef2d..dcce4cf 100644
--- a/drivers/phy/Kconfig
+++ b/drivers/phy/Kconfig
@@ -51,4 +51,15 @@ config PHY_EXYNOS_DP_VIDEO
help
Support for Display Port PHY found on Samsung EXYNOS SoCs.
+config PHY_SUN4I_USB
+ tristate "Allwinner sunxi SoC USB PHY driver"
+ depends on ARCH_SUNXI
+ select GENERIC_PHY
+ help
+ Enable this to support the transceiver that is part of Allwinner
+ sunxi SoCs.
+
+ This driver controls the entire USB PHY block, both the USB OTG
+ parts, as well as the 2 regular USB 2 host PHYs.
+
endmenu
diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
index d0caae9..e9e82f0 100644
--- a/drivers/phy/Makefile
+++ b/drivers/phy/Makefile
@@ -7,3 +7,4 @@ obj-$(CONFIG_PHY_EXYNOS_DP_VIDEO) += phy-exynos-dp-video.o
obj-$(CONFIG_PHY_EXYNOS_MIPI_VIDEO) += phy-exynos-mipi-video.o
obj-$(CONFIG_OMAP_USB2) += phy-omap-usb2.o
obj-$(CONFIG_TWL4030_USB) += phy-twl4030-usb.o
+obj-$(CONFIG_PHY_SUN4I_USB) += phy-sun4i-usb.o
diff --git a/drivers/phy/phy-sun4i-usb.c b/drivers/phy/phy-sun4i-usb.c
new file mode 100644
index 0000000..a15ecc1
--- /dev/null
+++ b/drivers/phy/phy-sun4i-usb.c
@@ -0,0 +1,318 @@
+/*
+ * Allwinner sun4i USB phy driver
+ *
+ * Copyright (C) 2014 Hans de Goede <hdegoede@xxxxxxxxxx>
+ *
+ * Based on code from
+ * Allwinner Technology Co., Ltd. <www.allwinnertech.com>
+ *
+ * Modelled after: Samsung S5P/EXYNOS SoC series MIPI CSIS/DSIM DPHY driver
+ * Copyright (C) 2013 Samsung Electronics Co., Ltd.
+ * Author: Sylwester Nawrocki <s.nawrocki@xxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/phy/phy.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/consumer.h>
+#include <linux/reset.h>
+
+#define REG_ISCR 0x00
+#define REG_PHYCTL 0x04
+#define REG_PHYBIST 0x08
+#define REG_PHYTUNE 0x0c
+
+#define SUNXI_AHB_ICHR8_EN BIT(10)
+#define SUNXI_AHB_INCR4_BURST_EN BIT(9)
+#define SUNXI_AHB_INCRX_ALIGN_EN BIT(8)
+#define SUNXI_ULPI_BYPASS_EN BIT(0)
+
+#define MAX_PHYS 3
+
+struct sun4i_usb_phy_data {
+ struct clk *clk;
+ void __iomem *base;
+ struct mutex mutex;
+ int num_phys;
+ u32 disc_thresh;
+ struct sun4i_usb_phy {
+ struct phy *phy;
+ void __iomem *pmu_irq;
+ struct regulator *vbus;
+ struct reset_control *reset;
+ int index;
+ } phys[MAX_PHYS];
+};
+
+#define to_sun4i_usb_phy_data(phy) \
+ container_of((phy), struct sun4i_usb_phy_data, phys[(phy)->index])
+
+static void sun4i_usb_phy_write(struct sun4i_usb_phy *phy, u32 addr, u32 data,
+ int len)
+{
+ struct sun4i_usb_phy_data *phy_data = to_sun4i_usb_phy_data(phy);
+ u32 temp, usbc_bit = BIT(phy->index * 2);
+ int i;
+
+ mutex_lock(&phy_data->mutex);
+
+ for (i = 0; i < len; i++) {
+ temp = readl(phy_data->base + REG_PHYCTL);
+
+ /* clear the address portion */
+ temp &= ~(0xff << 8);
+
+ /* set the address */
+ temp |= ((addr + i) << 8);
+ writel(temp, phy_data->base + REG_PHYCTL);
+
+ /* set the data bit and clear usbc bit*/
+ temp = readb(phy_data->base + REG_PHYCTL);
+ if (data & 0x1)
+ temp |= BIT(7);
+ else
+ temp &= ~BIT(7);
+ temp &= ~usbc_bit;
+ writeb(temp, phy_data->base + REG_PHYCTL);
+
+ /* pulse usbc_bit */
+ temp = readb(phy_data->base + REG_PHYCTL);
+ temp |= usbc_bit;
+ writeb(temp, phy_data->base + REG_PHYCTL);
+
+ temp = readb(phy_data->base + REG_PHYCTL);
+ temp &= ~usbc_bit;
+ writeb(temp, phy_data->base + REG_PHYCTL);
+
+ data >>= 1;
+ }
+ mutex_unlock(&phy_data->mutex);
+}
+
+static void sun4i_usb_phy_passby(struct sun4i_usb_phy *phy, int enable)
+{
+ u32 bits, reg_value;
+
+ if (!phy->pmu_irq)
+ return;
+
+ bits = SUNXI_AHB_ICHR8_EN | SUNXI_AHB_INCR4_BURST_EN |
+ SUNXI_AHB_INCRX_ALIGN_EN | SUNXI_ULPI_BYPASS_EN;
+
+ reg_value = readl(phy->pmu_irq);
+
+ if (enable)
+ reg_value |= bits;
+ else
+ reg_value &= ~bits;
+
+ writel(reg_value, phy->pmu_irq);
+}
+
+static int sun4i_usb_phy_init(struct phy *_phy)
+{
+ struct sun4i_usb_phy *phy = phy_get_drvdata(_phy);
+ struct sun4i_usb_phy_data *data = to_sun4i_usb_phy_data(phy);
+ int ret;
+
+ ret = clk_prepare_enable(data->clk);
+ if (ret)
+ return ret;
+
+ ret = reset_control_deassert(phy->reset);
+ if (ret) {
+ clk_disable_unprepare(data->clk);
+ return ret;
+ }
+
+ /* Adjust PHY's magnitude and rate */
+ sun4i_usb_phy_write(phy, 0x20, 0x14, 5);
+
+ /* Disconnect threshold adjustment */
+ sun4i_usb_phy_write(phy, 0x2a, data->disc_thresh, 2);
+
+ sun4i_usb_phy_passby(phy, 1);
+
+ return 0;
+}
+
+static int sun4i_usb_phy_exit(struct phy *_phy)
+{
+ struct sun4i_usb_phy *phy = phy_get_drvdata(_phy);
+ struct sun4i_usb_phy_data *data = to_sun4i_usb_phy_data(phy);
+
+ sun4i_usb_phy_passby(phy, 0);
+ reset_control_assert(phy->reset);
+ clk_disable_unprepare(data->clk);
+
+ return 0;
+}
+
+static int sun4i_usb_phy_power_on(struct phy *_phy)
+{
+ struct sun4i_usb_phy *phy = phy_get_drvdata(_phy);
+ int ret;
+
+ if (phy->vbus) {
+ ret = regulator_enable(phy->vbus);
+ if (ret)
+ return ret;
+
+ }
+
+ return 0;
+}
+
+static int sun4i_usb_phy_power_off(struct phy *_phy)
+{
+ struct sun4i_usb_phy *phy = phy_get_drvdata(_phy);
+
+ if (phy->vbus)
+ regulator_disable(phy->vbus);
+
+ return 0;
+}
+
+static struct phy_ops sun4i_usb_phy_ops = {
+ .init = sun4i_usb_phy_init,
+ .exit = sun4i_usb_phy_exit,
+ .power_on = sun4i_usb_phy_power_on,
+ .power_off = sun4i_usb_phy_power_off,
+ .owner = THIS_MODULE,
+};
+
+static struct phy *sun4i_usb_phy_xlate(struct device *dev,
+ struct of_phandle_args *args)
+{
+ struct sun4i_usb_phy_data *data = dev_get_drvdata(dev);
+
+ if (WARN_ON(args->args[0] == 0 || args->args[0] >= data->num_phys))
+ return ERR_PTR(-ENODEV);
+
+ return data->phys[args->args[0]].phy;
+}
+
+static int sun4i_usb_phy_probe(struct platform_device *pdev)
+{
+ struct sun4i_usb_phy_data *data;
+ struct device *dev = &pdev->dev;
+ struct device_node *np = dev->of_node;
+ void __iomem *pmu_irq = NULL;
+ struct phy_provider *phy_provider;
+ struct reset_control *reset;
+ struct regulator *vbus;
+ struct phy *phy;
+ char name[16];
+ int i;
+
+ data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ mutex_init(&data->mutex);
+ if (of_device_is_compatible(np, "allwinner,sun4i-a10-usb-phy")) {
+ data->num_phys = 3;
+ data->disc_thresh = 3;
+ } else if (of_device_is_compatible(np,
+ "allwinner,sun5i-a13-usb-phy")) {
+ data->num_phys = 2;
+ data->disc_thresh = 2;
+ } else { /* allwinner,sun7i-a20-usb-phy */
+ data->num_phys = 3;
+ data->disc_thresh = 2;
+ }
Maybe we can use of_match_data() here instead of having an ever-growing
list of if-else statements?
I've refactored this a bit to get rid of the if .. else if .. else structure.
Regards,
Hans
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