[U-Boot] [PATCH v1 09/16] ehci: Add support for Qualcomm EHCI

Mateusz Kulikowski
2016-01-06T18:21:21Z

This driver is able to reconfigure OTG controller into HOST mode.
Board can add board-specific initialization as board_prepare_usb().
It requires USB_ULPI_VIEWPORT enabled in board configuration.

Signed-off-by: Mateusz Kulikowski <mateusz.kulikowski@gmail.com>
---

Changes in v1:
- Reordered header files
- Removed braces around constant
- Added more verbose help to KConfig
- Added ULPI dependency to Kconfig
- Drop register #defines - use ehci-ci.h instead
- Create fixed ulpi viewport for device
- Use setbits/clearbits where possible
- Use wait_for_bit to reset controller
- Add dt binding documents

doc/device-tree-bindings/usb/ehci-msm.txt | 10 ++
drivers/usb/host/Kconfig | 11 ++
drivers/usb/host/Makefile | 1 +
drivers/usb/host/ehci-msm.c | 179 ++++++++++++++++++++++++++++++
4 files changed, 201 insertions(+)
create mode 100644 doc/device-tree-bindings/usb/ehci-msm.txt
create mode 100644 drivers/usb/host/ehci-msm.c

diff --git a/doc/device-tree-bindings/usb/ehci-msm.txt b/doc/device-tree-bindings/usb/ehci-msm.txt
new file mode 100644
index 0000000..205bb07
--- /dev/null
+++ b/doc/device-tree-bindings/usb/ehci-msm.txt
@@ -0,0 +1,10 @@
+Chipidea EHCI controller (part of OTG controller) used on Qualcomm devices.
+
+Required properties:
+- compatible: must be "qcom,ehci-host"
+- reg: start address and size of the registers
+
+ehci at 78d9000 {
+ compatible = "qcom,ehci-host";
+ reg = <0x78d9000 0x400>;
+};
diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig
index 39f7185..ff5e843 100644
--- a/drivers/usb/host/Kconfig
+++ b/drivers/usb/host/Kconfig
@@ -74,6 +74,17 @@ config USB_EHCI_MX6
---help---
Enables support for the on-chip EHCI controller on i.MX6 SoCs.

+config USB_EHCI_MSM
+ bool "Support for Qualcomm on-chip EHCI USB controller"
+ depends on DM_USB
+ select USB_ULPI_VIEWPORT
+ default n
+ ---help---
+ Enables support for the on-chip EHCI controller on Qualcomm
+ Snapdragon SoCs.
+ This driver supports combination of Chipidea USB controller
+ and Synapsys USB PHY in host mode only.
+
config USB_EHCI_UNIPHIER
bool "Support for UniPhier on-chip EHCI USB controller"
depends on ARCH_UNIPHIER && OF_CONTROL
diff --git a/drivers/usb/host/Makefile b/drivers/usb/host/Makefile
index 6183b80..426b066 100644
--- a/drivers/usb/host/Makefile
+++ b/drivers/usb/host/Makefile
@@ -43,6 +43,7 @@ obj-$(CONFIG_USB_EHCI_MX7) += ehci-mx6.o
obj-$(CONFIG_USB_EHCI_OMAP) += ehci-omap.o
obj-$(CONFIG_USB_EHCI_PPC4XX) += ehci-ppc4xx.o
obj-$(CONFIG_USB_EHCI_MARVELL) += ehci-marvell.o
+obj-$(CONFIG_USB_EHCI_MSM) += ehci-msm.o
obj-$(CONFIG_USB_EHCI_PCI) += ehci-pci.o
obj-$(CONFIG_USB_EHCI_SPEAR) += ehci-spear.o
obj-$(CONFIG_USB_EHCI_SUNXI) += ehci-sunxi.o
diff --git a/drivers/usb/host/ehci-msm.c b/drivers/usb/host/ehci-msm.c
new file mode 100644
index 0000000..2efa880
--- /dev/null
+++ b/drivers/usb/host/ehci-msm.c
@@ -0,0 +1,179 @@
+/*
+ * Qualcomm EHCI driver
+ *
+ * (C) Copyright 2015 Mateusz Kulikowski <mateusz.kulikowski@gmail.com>
+ *
+ * Based on Linux driver
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <fdtdec.h>
+#include <libfdt.h>
+#include <usb.h>
+#include <usb/ehci-ci.h>
+#include <usb/ulpi.h>
+#include <wait_bit.h>
+#include <asm/gpio.h>
+#include <asm/io.h>
+#include <linux/compat.h>
+#include "ehci.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_VBUSVLDEXTSEL (1 << 1)
+#define ULPI_MISC_A_VBUSVLDEXT (1 << 0)
+
+#define GEN2_SESS_VLD_CTRL_EN (1 << 7)
+
+#define SESS_VLD_CTRL (1 << 25)
+
+struct msm_ehci_priv {
+ struct ehci_ctrl ctrl; /* Needed by EHCI */
+ struct usb_ehci *ehci; /* Start of IP core*/
+ struct ulpi_viewport ulpi_vp; /* ULPI Viewport */
+};
+
+int __weak board_prepare_usb(enum usb_init_type type)
+{
+ return 0;
+}
+
+static void setup_usb_phy(struct msm_ehci_priv *priv)
+{
+ /* 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);
+}
+
+static void reset_usb_phy(struct msm_ehci_priv *priv)
+{
+ /* Disable VBUS mimicing in the controller. */
+ ulpi_write(&priv->ulpi_vp, (u8 *)ULPI_MISC_A_CLEAR,
+ ULPI_MISC_A_VBUSVLDEXTSEL | ULPI_MISC_A_VBUSVLDEXT);
+}
+
+
+static int msm_init_after_reset(struct ehci_ctrl *dev)
+{
+ struct msm_ehci_priv *p = container_of(dev, struct msm_ehci_priv, ctrl);
+ struct usb_ehci *ehci = p->ehci;
+
+ /* select ULPI phy */
+ writel(0x80000000, &ehci->portsc);
+ setup_usb_phy(p);
+
+ /* Enable sess_vld */
+ setbits_le32(&ehci->genconfig2, GEN2_SESS_VLD_CTRL_EN);
+
+ /* Enable external vbus configuration in the LINK */
+ setbits_le32(&ehci->usbcmd, SESS_VLD_CTRL);
+
+ /* USB_OTG_HS_AHB_BURST */
+ writel(0x0, &ehci->sbuscfg);
+
+ /* USB_OTG_HS_AHB_MODE: HPROT_MODE */
+ /* Bus access related config. */
+ writel(0x08, &ehci->sbusmode);
+
+ /* set mode to host controller */
+ writel(CM_HOST, &ehci->usbmode);
+
+ return 0;
+}
+
+static const struct ehci_ops msm_ehci_ops = {
+ .init_after_reset = msm_init_after_reset
+};
+
+static int ehci_usb_probe(struct udevice *dev)
+{
+ struct msm_ehci_priv *p = dev_get_priv(dev);
+ struct usb_ehci *ehci = p->ehci;
+ struct ehci_hccr *hccr;
+ struct ehci_hcor *hcor;
+ int ret;
+
+ hccr = (struct ehci_hccr *)((phys_addr_t)&ehci->caplength);
+ hcor = (struct ehci_hcor *)((phys_addr_t)hccr +
+ HC_LENGTH(ehci_readl(&(hccr)->cr_capbase)));
+
+ ret = board_prepare_usb(USB_INIT_HOST);
+ if (ret < 0)
+ return ret;
+
+
+ return ehci_register(dev, hccr, hcor, &msm_ehci_ops, 0, USB_INIT_HOST);
+}
+
+static int ehci_usb_remove(struct udevice *dev)
+{
+ struct msm_ehci_priv *p = dev_get_priv(dev);
+ struct usb_ehci *ehci = p->ehci;
+ int ret;
+
+ ret = ehci_deregister(dev);
+ if (ret)
+ return ret;
+
+ /* Stop controller. */
+ clrbits_le32(&ehci->usbcmd, CMD_RUN);
+
+ reset_usb_phy(p);
+
+ ret = board_prepare_usb(USB_INIT_DEVICE); /* Board specific hook */
+ if (ret < 0)
+ return ret;
+
+ /* Reset controller */
+ setbits_le32(&ehci->usbcmd, CMD_RESET);
+
+ /* Wait for reset */
+ if (wait_for_bit(__func__, &ehci->usbcmd, CMD_RESET, false, 30,
+ false)) {
+ printf("Stuck on USB reset.\n");
+ return -ETIMEDOUT;
+ }
+
+ return 0;
+}
+
+static int ehci_usb_ofdata_to_platdata(struct udevice *dev)
+{
+ struct msm_ehci_priv *priv = dev_get_priv(dev);
+
+ priv->ulpi_vp.port_num = 0;
+ priv->ehci = (void *)dev_get_addr(dev);
+
+ if (priv->ehci == (void *)FDT_ADDR_T_NONE)
+ return -EINVAL;
+
+ /* 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 const struct udevice_id ehci_usb_ids[] = {
+ { .compatible = "qcom,ehci-host", },
+ { }
+};
+
+U_BOOT_DRIVER(usb_ehci) = {
+ .name = "ehci_msm",
+ .id = UCLASS_USB,
+ .of_match = ehci_usb_ids,
+ .ofdata_to_platdata = ehci_usb_ofdata_to_platdata,
+ .probe = ehci_usb_probe,
+ .remove = ehci_usb_remove,
+ .ops = &ehci_usb_ops,
+ .priv_auto_alloc_size = sizeof(struct msm_ehci_priv),
+ .flags = DM_FLAG_ALLOC_PRIV_DMA,
+};
--
2.5.0