PHY: Add phy driver for the keystone USB PHY

Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com> Reviewed-by: Tom Rini <trini@konsulko.com>

PHY: Add phy driver for the keystone USB PHY
Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com> Reviewed-by: Tom Rini <trini@konsulko.com>
Jean-Jacques Hiblot · Marek Vasut
1 parent d53653f3f9
Showing 3 changed files with 120 additions and 0 deletions Side-by-side Diff
drivers/phy/Kconfig
drivers/phy/Makefile
drivers/phy/keystone-usb-phy.c
@@ -164,5 +164,15 @@
  
 	  This PHY is found on OMAP devices supporting USB2.
  
+
+config KEYSTONE_USB_PHY
+	bool "Support TI Keystone USB PHY"
+	depends on PHY
+	depends on ARCH_KEYSTONE
+	help
+	  Support for the USB PHY found on some Keystone (k2) processors
+
+	  This PHY is found on some Keystone (K2) devices supporting USB.
+
 endmenu
@@ -18,4 +18,5 @@
 obj-$(CONFIG_MESON_GXL_USB_PHY) += meson-gxl-usb2.o meson-gxl-usb3.o
 obj-$(CONFIG_MSM8916_USB_PHY) += msm8916-usbh-phy.o
 obj-$(CONFIG_OMAP_USB2_PHY) += omap-usb2-phy.o
+obj-$(CONFIG_KEYSTONE_USB_PHY) += keystone-usb-phy.o
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2017 Texas Instruments Incorporated - http://www.ti.com/
+ * Written by Jean-Jacques Hiblot  <jjhiblot@ti.com>
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <dm/device.h>
+#include <generic-phy.h>
+#include <asm/io.h>
+
+/* USB PHY control register offsets */
+#define USB_PHY_CTL_UTMI		0x0000
+#define USB_PHY_CTL_PIPE		0x0004
+#define USB_PHY_CTL_PARAM_1		0x0008
+#define USB_PHY_CTL_PARAM_2		0x000c
+#define USB_PHY_CTL_CLOCK		0x0010
+#define USB_PHY_CTL_PLL			0x0014
+
+#define PHY_OTG_VBUSVLDECTSEL		BIT(16)
+#define PHY_REF_SSP_EN			BIT(29)
+
+struct keystone_usb_phy {
+	void __iomem *reg;
+};
+
+static int keystone_usb_init(struct phy *phy)
+{
+	u32 val;
+	struct udevice *dev = phy->dev;
+	struct keystone_usb_phy *keystone = dev_get_priv(dev);
+
+	/*
+	 * VBUSVLDEXTSEL has a default value of 1 in BootCfg but shouldn't.
+	 * It should always be cleared because our USB PHY has an onchip VBUS
+	 * analog comparator.
+	 */
+	val = readl(keystone->reg + USB_PHY_CTL_CLOCK);
+	/* quit selecting the vbusvldextsel by default! */
+	val &= ~PHY_OTG_VBUSVLDECTSEL;
+	writel(val, keystone->reg + USB_PHY_CTL_CLOCK);
+
+	return 0;
+}
+
+static int keystone_usb_power_on(struct phy *phy)
+{
+	u32 val;
+	struct udevice *dev = phy->dev;
+	struct keystone_usb_phy *keystone = dev_get_priv(dev);
+
+	val = readl(keystone->reg + USB_PHY_CTL_CLOCK);
+	val |= PHY_REF_SSP_EN;
+	writel(val, keystone->reg + USB_PHY_CTL_CLOCK);
+
+	return 0;
+}
+
+static int keystone_usb_power_off(struct phy *phy)
+{
+	u32 val;
+	struct udevice *dev = phy->dev;
+	struct keystone_usb_phy *keystone = dev_get_priv(dev);
+
+	val = readl(keystone->reg + USB_PHY_CTL_CLOCK);
+	val &= ~PHY_REF_SSP_EN;
+	writel(val, keystone->reg + USB_PHY_CTL_CLOCK);
+
+	return 0;
+}
+
+static int keystone_usb_exit(struct phy *phy)
+{
+	return 0;
+}
+
+static int keystone_usb_phy_probe(struct udevice *dev)
+{
+	struct keystone_usb_phy *keystone = dev_get_priv(dev);
+
+	keystone->reg = dev_remap_addr_index(dev, 0);
+	if (!keystone->reg) {
+		pr_err("unable to remap usb phy\n");
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static const struct udevice_id keystone_usb_phy_ids[] = {
+	{ .compatible = "ti,keystone-usbphy" },
+	{ }
+};
+
+static struct phy_ops keystone_usb_phy_ops = {
+	.init = keystone_usb_init,
+	.power_on = keystone_usb_power_on,
+	.power_off = keystone_usb_power_off,
+	.exit = keystone_usb_exit,
+};
+
+U_BOOT_DRIVER(keystone_usb_phy) = {
+	.name	= "keystone_usb_phy",
+	.id	= UCLASS_PHY,
+	.of_match = keystone_usb_phy_ids,
+	.ops = &keystone_usb_phy_ops,
+	.probe = keystone_usb_phy_probe,
+	.priv_auto_alloc_size = sizeof(struct keystone_usb_phy),
+};
...	...	@@ -164,5 +164,15 @@
164	164
165	165	This PHY is found on OMAP devices supporting USB2.
166	166
	167	+
	168	+config KEYSTONE_USB_PHY
	169	+ bool "Support TI Keystone USB PHY"
	170	+ depends on PHY
	171	+ depends on ARCH_KEYSTONE
	172	+ help
	173	+ Support for the USB PHY found on some Keystone (k2) processors
	174	+
	175	+ This PHY is found on some Keystone (K2) devices supporting USB.
	176	+
167	177	endmenu
...	...	@@ -18,4 +18,5 @@
18	18	obj-$(CONFIG_MESON_GXL_USB_PHY) += meson-gxl-usb2.o meson-gxl-usb3.o
19	19	obj-$(CONFIG_MSM8916_USB_PHY) += msm8916-usbh-phy.o
20	20	obj-$(CONFIG_OMAP_USB2_PHY) += omap-usb2-phy.o
	21	+obj-$(CONFIG_KEYSTONE_USB_PHY) += keystone-usb-phy.o
	1	+// SPDX-License-Identifier: GPL-2.0+
	2	+/*
	3	+ * Copyright (C) 2017 Texas Instruments Incorporated - http://www.ti.com/
	4	+ * Written by Jean-Jacques Hiblot <jjhiblot@ti.com>
	5	+ */
	6	+
	7	+#include <common.h>
	8	+#include <dm.h>
	9	+#include <dm/device.h>
	10	+#include <generic-phy.h>
	11	+#include <asm/io.h>
	12	+
	13	+/* USB PHY control register offsets */
	14	+#define USB_PHY_CTL_UTMI 0x0000
	15	+#define USB_PHY_CTL_PIPE 0x0004
	16	+#define USB_PHY_CTL_PARAM_1 0x0008
	17	+#define USB_PHY_CTL_PARAM_2 0x000c
	18	+#define USB_PHY_CTL_CLOCK 0x0010
	19	+#define USB_PHY_CTL_PLL 0x0014
	20	+
	21	+#define PHY_OTG_VBUSVLDECTSEL BIT(16)
	22	+#define PHY_REF_SSP_EN BIT(29)
	23	+
	24	+struct keystone_usb_phy {
	25	+ void __iomem *reg;
	26	+};
	27	+
	28	+static int keystone_usb_init(struct phy *phy)
	29	+{
	30	+ u32 val;
	31	+ struct udevice *dev = phy->dev;
	32	+ struct keystone_usb_phy *keystone = dev_get_priv(dev);
	33	+
	34	+ /*
	35	+ * VBUSVLDEXTSEL has a default value of 1 in BootCfg but shouldn't.
	36	+ * It should always be cleared because our USB PHY has an onchip VBUS
	37	+ * analog comparator.
	38	+ */
	39	+ val = readl(keystone->reg + USB_PHY_CTL_CLOCK);
	40	+ /* quit selecting the vbusvldextsel by default! */
	41	+ val &= ~PHY_OTG_VBUSVLDECTSEL;
	42	+ writel(val, keystone->reg + USB_PHY_CTL_CLOCK);
	43	+
	44	+ return 0;
	45	+}
	46	+
	47	+static int keystone_usb_power_on(struct phy *phy)
	48	+{
	49	+ u32 val;
	50	+ struct udevice *dev = phy->dev;
	51	+ struct keystone_usb_phy *keystone = dev_get_priv(dev);
	52	+
	53	+ val = readl(keystone->reg + USB_PHY_CTL_CLOCK);
	54	+ val \|= PHY_REF_SSP_EN;
	55	+ writel(val, keystone->reg + USB_PHY_CTL_CLOCK);
	56	+
	57	+ return 0;
	58	+}
	59	+
	60	+static int keystone_usb_power_off(struct phy *phy)
	61	+{
	62	+ u32 val;
	63	+ struct udevice *dev = phy->dev;
	64	+ struct keystone_usb_phy *keystone = dev_get_priv(dev);
	65	+
	66	+ val = readl(keystone->reg + USB_PHY_CTL_CLOCK);
	67	+ val &= ~PHY_REF_SSP_EN;
	68	+ writel(val, keystone->reg + USB_PHY_CTL_CLOCK);
	69	+
	70	+ return 0;
	71	+}
	72	+
	73	+static int keystone_usb_exit(struct phy *phy)
	74	+{
	75	+ return 0;
	76	+}
	77	+
	78	+static int keystone_usb_phy_probe(struct udevice *dev)
	79	+{
	80	+ struct keystone_usb_phy *keystone = dev_get_priv(dev);
	81	+
	82	+ keystone->reg = dev_remap_addr_index(dev, 0);
	83	+ if (!keystone->reg) {
	84	+ pr_err("unable to remap usb phy\n");
	85	+ return -EINVAL;
	86	+ }
	87	+ return 0;
	88	+}
	89	+
	90	+static const struct udevice_id keystone_usb_phy_ids[] = {
	91	+ { .compatible = "ti,keystone-usbphy" },
	92	+ { }
	93	+};
	94	+
	95	+static struct phy_ops keystone_usb_phy_ops = {
	96	+ .init = keystone_usb_init,
	97	+ .power_on = keystone_usb_power_on,
	98	+ .power_off = keystone_usb_power_off,
	99	+ .exit = keystone_usb_exit,
	100	+};
	101	+
	102	+U_BOOT_DRIVER(keystone_usb_phy) = {
	103	+ .name = "keystone_usb_phy",
	104	+ .id = UCLASS_PHY,
	105	+ .of_match = keystone_usb_phy_ids,
	106	+ .ops = &keystone_usb_phy_ops,
	107	+ .probe = keystone_usb_phy_probe,
	108	+ .priv_auto_alloc_size = sizeof(struct keystone_usb_phy),
	109	+};