[U-Boot] [PATCH v2 05/14] phy: db410c: Add MSM USB PHY driver

Ramon Fried
2018-09-21T10:35:47Z

Add a PHY driver for the Qualcomm dragonboard 410c which
allows switching on/off and resetting the phy connected
to the EHCI controllers and USBHS controller.

Signed-off-by: Ramon Fried <ramon.fried@gmail.com>
---

Changes in v2: None

MAINTAINERS | 1 +
drivers/phy/Kconfig | 8 +++
drivers/phy/Makefile | 1 +
drivers/phy/msm8916-usbh-phy.c | 109 +++++++++++++++++++++++++++++++++
4 files changed, 119 insertions(+)
create mode 100644 drivers/phy/msm8916-usbh-phy.c

diff --git a/MAINTAINERS b/MAINTAINERS
index 39d28e5d45..1a5b543dc7 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -209,6 +209,7 @@ S: Maintained
F: arch/arm/mach-snapdragon/
F: drivers/gpio/msm_gpio.c
F: drivers/mmc/msm_sdhci.c
+F: drivers/phy/msm8916-usbh-phy.c
F: drivers/serial/serial_msm.c
F: drivers/smem/msm_smem.c
F: drivers/usb/host/ehci-msm.c
diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
index e0822bb775..bcc8e22795 100644
--- a/drivers/phy/Kconfig
+++ b/drivers/phy/Kconfig
@@ -139,4 +139,12 @@ config MESON_GXL_USB_PHY
This is the generic phy driver for the Amlogic Meson GXL
USB2 and USB3 PHYS.

+config MSM8916_USB_PHY
+ bool "Qualcomm MSM8916 USB PHY support"
+ depends on PHY
+ help
+ Support the USB PHY in msm8916
+
+ This PHY is found on qualcomm dragonboard410c development board.
+
endmenu
diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
index 178fb4530e..1e1e4ca11e 100644
--- a/drivers/phy/Makefile
+++ b/drivers/phy/Makefile
@@ -15,3 +15,4 @@ obj-$(CONFIG_STI_USB_PHY) += sti_usb_phy.o
obj-$(CONFIG_PHY_RCAR_GEN2) += phy-rcar-gen2.o
obj-$(CONFIG_PHY_STM32_USBPHYC) += phy-stm32-usbphyc.o
obj-$(CONFIG_MESON_GXL_USB_PHY) += meson-gxl-usb2.o meson-gxl-usb3.o
+obj-$(CONFIG_MSM8916_USB_PHY) += msm8916-usbh-phy.o
diff --git a/drivers/phy/msm8916-usbh-phy.c b/drivers/phy/msm8916-usbh-phy.c
new file mode 100644
index 0000000000..2c90738fca
--- /dev/null
+++ b/drivers/phy/msm8916-usbh-phy.c
@@ -0,0 +1,109 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2018 Ramon Fried <ramon.fried@gmail.com>
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <generic-phy.h>
+#include <usb/ehci-ci.h>
+#include <usb/ulpi.h>
+#include <asm/io.h>
+
+/* PHY viewport regs */
+#define ULPI_MISC_A_READ 0x96
+#define ULPI_MISC_A_SET 0x97
+#define ULPI_MISC_A_CLEAR 0x98
+#define ULPI_MISC_A_VBUSVLDEXT BIT(0)
+#define ULPI_MISC_A_VBUSVLDEXTSEL BIT(1)
+#define GEN2_SESS_VLD_CTRL_EN BIT(7)
+#define SESS_VLD_CTRL BIT(25)
+
+struct msm_phy_priv {
+ void __iomem *regs;
+ struct usb_ehci *ehci; /* Start of IP core*/
+ struct ulpi_viewport ulpi_vp; /* ULPI Viewport */
+};
+
+static int msm_phy_power_on(struct phy *phy)
+{
+ struct msm_phy_priv *priv = dev_get_priv(phy->dev);
+
+ /* Select and enable external configuration with USB PHY */
+ ulpi_write(&priv->ulpi_vp, (u8 *)ULPI_MISC_A_SET,
+ ULPI_MISC_A_VBUSVLDEXTSEL | ULPI_MISC_A_VBUSVLDEXT);
+
+ return 0;
+}
+
+static int msm_phy_power_off(struct phy *phy)
+{
+ struct msm_phy_priv *priv = dev_get_priv(phy->dev);
+
+ /* Disable VBUS mimicing in the controller. */
+ ulpi_write(&priv->ulpi_vp, (u8 *)ULPI_MISC_A_CLEAR,
+ ULPI_MISC_A_VBUSVLDEXTSEL | ULPI_MISC_A_VBUSVLDEXT);
+ return 0;
+}
+
+static int msm_phy_reset(struct phy *phy)
+{
+ struct msm_phy_priv *p = dev_get_priv(phy->dev);
+
+ /* select ULPI phy */
+ writel(PORT_PTS_ULPI, &p->ehci->portsc);
+
+ /* Enable sess_vld */
+ setbits_le32(&p->ehci->genconfig2, GEN2_SESS_VLD_CTRL_EN);
+
+ /* Enable external vbus configuration in the LINK */
+ setbits_le32(&p->ehci->usbcmd, SESS_VLD_CTRL);
+
+ /* USB_OTG_HS_AHB_BURST */
+ writel(0x0, &p->ehci->sbuscfg);
+
+ /* USB_OTG_HS_AHB_MODE: HPROT_MODE */
+ /* Bus access related config. */
+ writel(0x08, &p->ehci->sbusmode);
+
+ return 0;
+}
+
+static int msm_phy_probe(struct udevice *dev)
+{
+ struct msm_phy_priv *priv = dev_get_priv(dev);
+
+ priv->regs = dev_remap_addr(dev);
+ if (!priv->regs)
+ return -EINVAL;
+
+ priv->ehci = (struct usb_ehci *)priv->regs;
+ priv->ulpi_vp.port_num = 0;
+
+ /* Warning: this will not work if viewport address is > 64 bit due to
+ * ULPI design.
+ */
+ priv->ulpi_vp.viewport_addr = (phys_addr_t)&priv->ehci->ulpi_viewpoint;
+
+ return 0;
+}
+
+static struct phy_ops msm_phy_ops = {
+ .power_on = msm_phy_power_on,
+ .power_off = msm_phy_power_off,
+ .reset = msm_phy_reset,
+};
+
+static const struct udevice_id msm_phy_ids[] = {
+ { .compatible = "qcom,apq8016-usbphy" },
+ { }
+};
+
+U_BOOT_DRIVER(msm8916_usbphy) = {
+ .name = "msm8916_usbphy",
+ .id = UCLASS_PHY,
+ .of_match = msm_phy_ids,
+ .ops = &msm_phy_ops,
+ .probe = msm_phy_probe,
+ .priv_auto_alloc_size = sizeof(struct msm_phy_priv),
+};
--
2.18.0