[U-Boot] [PATCH 05/21] phy: Add STi phy usb support

patrice.chotard at st.com patrice.chotard at st.com
Fri Mar 17 16:25:16 UTC 2017


From: Patrice Chotard <patrice.chotard at st.com>

This is the generic phy driver for the picoPHY ports
used by USB2 and USB3 Host controllers available on
STiH407 SoC families.

Signed-off-by: Patrice Chotard <patrice.chotard at st.com>
---
 configs/stih410-b2260_defconfig |   1 +
 drivers/usb/Kconfig             |   4 +
 drivers/usb/phy/Kconfig         |  11 +++
 drivers/usb/phy/Makefile        |   1 +
 drivers/usb/phy/sti_phy_usb.c   | 158 ++++++++++++++++++++++++++++++++++++++++
 5 files changed, 175 insertions(+)
 create mode 100644 drivers/usb/phy/Kconfig
 create mode 100644 drivers/usb/phy/sti_phy_usb.c

diff --git a/configs/stih410-b2260_defconfig b/configs/stih410-b2260_defconfig
index 9ee2fe4..ade618f 100644
--- a/configs/stih410-b2260_defconfig
+++ b/configs/stih410-b2260_defconfig
@@ -17,6 +17,7 @@ CONFIG_CMD_FS_GENERIC=y
 CONFIG_OF_CONTROL=y
 CONFIG_REGMAP=y
 CONFIG_SYSCON=y
+CONFIG_MISC=y
 CONFIG_MMC_SDHCI=y
 CONFIG_MMC_SDHCI_STI=y
 CONFIG_PINCTRL=y
diff --git a/drivers/usb/Kconfig b/drivers/usb/Kconfig
index da3ec2f..e30c9d6 100644
--- a/drivers/usb/Kconfig
+++ b/drivers/usb/Kconfig
@@ -94,4 +94,8 @@ endif
 
 source "drivers/usb/gadget/Kconfig"
 
+comment "USB PHY"
+
+source "drivers/usb/phy/Kconfig"
+
 endif
diff --git a/drivers/usb/phy/Kconfig b/drivers/usb/phy/Kconfig
new file mode 100644
index 0000000..1a86c6e
--- /dev/null
+++ b/drivers/usb/phy/Kconfig
@@ -0,0 +1,11 @@
+menu "USB PHY drivers"
+
+config STI_PHY_USB
+	bool "STMicroelectronics USB2 picoPHY driver for STiH407 family"
+	default n
+	help
+	  This is the generic phy driver for the picoPHY ports
+	  used by USB2 and USB3 Host controllers available on
+	  STiH407 SoC families.
+
+endmenu
diff --git a/drivers/usb/phy/Makefile b/drivers/usb/phy/Makefile
index 4e548c2..b50fb5a 100644
--- a/drivers/usb/phy/Makefile
+++ b/drivers/usb/phy/Makefile
@@ -8,3 +8,4 @@
 obj-$(CONFIG_TWL4030_USB) += twl4030.o
 obj-$(CONFIG_OMAP_USB_PHY) += omap_usb_phy.o
 obj-$(CONFIG_ROCKCHIP_USB2_PHY) += rockchip_usb2_phy.o
+obj-$(CONFIG_STI_PHY_USB) += sti_phy_usb.o
diff --git a/drivers/usb/phy/sti_phy_usb.c b/drivers/usb/phy/sti_phy_usb.c
new file mode 100644
index 0000000..214d7ff
--- /dev/null
+++ b/drivers/usb/phy/sti_phy_usb.c
@@ -0,0 +1,158 @@
+/*
+ * Copyright (c) 2017
+ * Patrice Chotard <patrice.chotard at st.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <bitfield.h>
+#include <dm.h>
+#include <errno.h>
+#include <fdtdec.h>
+#include <libfdt.h>
+#include <regmap.h>
+#include <reset-uclass.h>
+#include <syscon.h>
+#include <wait_bit.h>
+
+#include <linux/bitops.h>
+#include <linux/compat.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/* Default PHY_SEL and REFCLKSEL configuration */
+#define STIH407_USB_PICOPHY_CTRL_PORT_CONF	0x6
+
+/* ports parameters overriding */
+#define STIH407_USB_PICOPHY_PARAM_DEF		0x39a4dc
+
+#define PHYPARAM_REG	1
+#define PHYCTRL_REG	2
+#define PHYPARAM_NB	3
+
+struct sti_phy_usb {
+	struct regmap *regmap;
+	struct reset_ctl global_ctl;
+	struct reset_ctl port_ctl;
+	int param;
+	int ctrl;
+};
+
+static int sti_phy_usb_deassert(struct sti_phy_usb *phy)
+{
+	int ret;
+
+	ret = reset_deassert(&phy->global_ctl);
+	if (ret < 0) {
+		error("PHY global deassert failed: %d", ret);
+		return ret;
+	}
+
+	ret = reset_deassert(&phy->port_ctl);
+	if (ret < 0)
+		error("PHY port deassert failed: %d", ret);
+
+	return ret;
+}
+
+static void sti_phy_usb_init(struct sti_phy_usb *phy)
+{
+	void __iomem *reg;
+	u32 val;
+
+	/* set ctrl picophy value */
+	reg = (void __iomem *)phy->regmap->base + phy->ctrl;
+	val = readl(reg);
+	/* CTRL_PORT mask is 0x1f */
+	bitfield_replace(val, 0, 5, STIH407_USB_PICOPHY_CTRL_PORT_CONF);
+	writel(val, reg);
+
+	/* set ports parameters overriding */
+	reg = (void __iomem *)phy->regmap->base + phy->param;
+	val = readl(reg);
+	/* PARAM_DEF mask is 0xffffffff */
+	bitfield_replace(val, 0, 31, STIH407_USB_PICOPHY_PARAM_DEF);
+	writel(val, reg);
+}
+
+int sti_phy_usb_probe(struct udevice *dev)
+{
+	struct sti_phy_usb *priv = dev_get_priv(dev);
+	struct udevice *syscon;
+	struct fdtdec_phandle_args syscfg_phandle;
+	u32 cells[PHYPARAM_NB];
+	int ret, count;
+
+	/* get corresponding syscon phandle */
+	ret = fdtdec_parse_phandle_with_args(gd->fdt_blob, dev->of_offset,
+					     "st,syscfg", NULL, 0, 0,
+					     &syscfg_phandle);
+	if (ret < 0) {
+		error("Can't get syscfg phandle: %d\n", ret);
+		return ret;
+	}
+
+	ret = uclass_get_device_by_of_offset(UCLASS_SYSCON, syscfg_phandle.node,
+					     &syscon);
+	if (ret) {
+		error("unable to find syscon device (%d)\n", ret);
+		return ret;
+	}
+
+	priv->regmap = syscon_get_regmap(syscon);
+	if (!priv->regmap) {
+		error("unable to find regmap\n");
+		return -ENODEV;
+	}
+
+	/* get phy param offset */
+	count = fdtdec_get_int_array_count(gd->fdt_blob, dev->of_offset,
+					   "st,syscfg", cells,
+					   ARRAY_SIZE(cells));
+
+	if (count < 0) {
+		error("Bad PHY st,syscfg property %d\n", count);
+		return -EINVAL;
+	}
+
+	if (count > PHYPARAM_NB) {
+		error("Unsupported PHY param count %d\n", count);
+		return -EINVAL;
+	}
+
+	priv->param = cells[PHYPARAM_REG];
+	priv->ctrl = cells[PHYCTRL_REG];
+
+	/* get global reset control */
+	ret = reset_get_by_name(dev, "global", &priv->global_ctl);
+	if (ret) {
+		error("can't get global reset for %s (%d)", dev->name, ret);
+		return ret;
+	}
+
+	/* get port reset control */
+	ret = reset_get_by_name(dev, "port", &priv->port_ctl);
+	if (ret) {
+		error("can't get port reset for %s (%d)", dev->name, ret);
+		return ret;
+	}
+
+	sti_phy_usb_init(priv);
+
+	return sti_phy_usb_deassert(priv);
+}
+
+static const struct udevice_id sti_phy_usb_ids[] = {
+	{ .compatible = "st,stih407-usb2-phy" },
+	{ }
+};
+
+U_BOOT_DRIVER(sti_phy_usb) = {
+	.name = "sti_phy_usb",
+	.id = UCLASS_MISC,
+	.of_match = sti_phy_usb_ids,
+	.probe = sti_phy_usb_probe,
+	.priv_auto_alloc_size = sizeof(struct sti_phy_usb),
+};
-- 
1.9.1



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