[U-Boot] [PATCH v4 05/12] usb: ehci: Add STi ehci support

[patrice.chotard at st.com]

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

Add support for on-chip ehci controller available
on STMicrolectronics SoCs.
ehci support will be then available on both type A
USB 2.0 connectors.

Signed-off-by: Patrice Chotard <patrice.chotard at st.com>
---

v4:	_ update to use the new PHY uclass currently available on dm-next branch

v3: 	_ update to use new USB PHY uclass

v2:	_ update error messages
	_ add remove callback to put core into reset

 drivers/usb/host/Kconfig    |   9 ++++
 drivers/usb/host/Makefile   |   1 +
 drivers/usb/host/ehci-sti.c | 120 ++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 130 insertions(+)
 create mode 100644 drivers/usb/host/ehci-sti.c

diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig
index 0bf8274..7c29bf5 100644
--- a/drivers/usb/host/Kconfig
+++ b/drivers/usb/host/Kconfig
@@ -121,6 +121,15 @@ config USB_EHCI_MSM
 	  This driver supports combination of Chipidea USB controller
 	  and Synapsys USB PHY in host mode only.
 
+config USB_EHCI_STI
+	bool "Support for STMicroelectronics on-chip EHCI USB controller"
+	depends on ARCH_STI
+	select STI_PHY_USB
+	default y
+	---help---
+	  Enables support for the on-chip EHCI controller on
+	  STMicroelectronics SoCs.
+
 config USB_EHCI_ZYNQ
 	bool "Support for Xilinx Zynq on-chip EHCI USB controller"
 	depends on ARCH_ZYNQ
diff --git a/drivers/usb/host/Makefile b/drivers/usb/host/Makefile
index 58c0cf5..303aa32 100644
--- a/drivers/usb/host/Makefile
+++ b/drivers/usb/host/Makefile
@@ -46,6 +46,7 @@ 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-$(CONFIG_USB_EHCI_STI) += ehci-sti.o
 obj-$(CONFIG_USB_EHCI_SUNXI) += ehci-sunxi.o
 obj-$(CONFIG_USB_EHCI_TEGRA) += ehci-tegra.o
 obj-$(CONFIG_USB_EHCI_VCT) += ehci-vct.o
diff --git a/drivers/usb/host/ehci-sti.c b/drivers/usb/host/ehci-sti.c
new file mode 100644
index 0000000..df7367d
--- /dev/null
+++ b/drivers/usb/host/ehci-sti.c
@@ -0,0 +1,120 @@
+/*
+ * Copyright (c) 2017
+ * Patrice Chotard <patrice.chotard at st.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <dm.h>
+#include <errno.h>
+#include "ehci.h"
+#include <generic-phy.h>
+#include <reset-uclass.h>
+#include <usb.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+struct sti_ehci_priv {
+	struct ehci_ctrl ctrl;
+	struct reset_ctl power_ctl;
+	struct reset_ctl softreset_ctl;
+	struct phy usb_phy;
+};
+
+static int sti_ehci_probe(struct udevice *dev)
+{
+	struct sti_ehci_priv *priv = dev_get_priv(dev);
+	struct ehci_hccr *hccr = priv->ctrl.hccr;
+	struct ehci_hcor *hcor;
+	int ret;
+
+	hccr = (struct ehci_hccr *)dev_get_addr(dev);
+
+	if (hccr == (void *)FDT_ADDR_T_NONE)
+		return -EINVAL;
+
+	ret = reset_get_by_name(dev, "power", &priv->power_ctl);
+	if (ret) {
+		error("can't get power for %s: %d", dev->name, ret);
+		return ret;
+	}
+
+	ret = reset_get_by_name(dev, "softreset", &priv->softreset_ctl);
+	if (ret) {
+		error("can't get soft reset for %s: %d", dev->name, ret);
+		return ret;
+	}
+
+	ret = generic_phy_get_by_name(dev, "usb", &priv->usb_phy);
+	if (ret) {
+		error("USB PHY DT node not found for %s: %d", dev->name, ret);
+		return ret;
+	}
+
+	ret = reset_deassert(&priv->softreset_ctl);
+	if (ret < 0) {
+		error("EHCI soft reset deassert failed: %d", ret);
+		return ret;
+	}
+
+	ret = reset_deassert(&priv->power_ctl);
+	if (ret < 0) {
+		error("EHCI power deassert failed: %d", ret);
+		return ret;
+	}
+
+	ret = generic_phy_init(&priv->usb_phy);
+	if (ret) {
+		error("Can't init USB PHY for %s: %d\n", dev->name, ret);
+		return ret;
+	}
+
+	hcor = (struct ehci_hcor *)((phys_addr_t)hccr +
+			HC_LENGTH(ehci_readl(&(hccr)->cr_capbase)));
+
+	return ehci_register(dev, hccr, hcor, NULL, 0, USB_INIT_HOST);
+}
+
+static int sti_ehci_remove(struct udevice *dev)
+{
+	struct sti_ehci_priv *priv = dev_get_priv(dev);
+	int ret;
+
+	ret = ehci_deregister(dev);
+	if (ret)
+		return ret;
+
+	ret = reset_assert(&priv->power_ctl);
+	if (ret < 0) {
+		error("EHCI power assert failed: %d", ret);
+		return ret;
+	}
+
+	ret = reset_assert(&priv->softreset_ctl);
+	if (ret < 0)
+		error("EHCI soft reset assert failed: %d", ret);
+
+	ret = generic_phy_exit(&priv->usb_phy);
+	if (ret < 0)
+		error("Generic phy exit failed: %d", ret);
+
+	return ret;
+}
+
+static const struct udevice_id sti_usb_ids[] = {
+	{ .compatible = "st,st-ehci-300x" },
+	{ }
+};
+
+U_BOOT_DRIVER(ehci_sti) = {
+	.name = "ehci_sti",
+	.id = UCLASS_USB,
+	.of_match = sti_usb_ids,
+	.probe = sti_ehci_probe,
+	.remove = sti_ehci_remove,
+	.ops = &ehci_usb_ops,
+	.priv_auto_alloc_size = sizeof(struct sti_ehci_priv),
+	.flags	= DM_FLAG_ALLOC_PRIV_DMA,
+};
-- 
1.9.1