phy: db410c: Add MSM USB PHY driver

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>

diff --git a/MAINTAINERS b/MAINTAINERS
index 45518436ff11a0a44dd3178e6622e50726999280..6147a4ffafaa42753713ff8eb09825e1036acc06 100644 (file)
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -210,6 +210,7 @@ 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 e0822bb7759148c723051d5d6996146cccfe0d06..bcc8e22795a9d95a99c35f4c474ed6d543ce64ed 100644 (file)
--- 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 178fb4530eb37767652048848c666b4fe8db0192..1e1e4ca11e4fd129b61b38afefd04c0bae954121 100644 (file)
--- 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 (file)
index 0000000..2c90738
--- /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),
+};