usb: host: Add ehci-vf USB driver for ARM Vybrid SoC's

This driver adds support for the USB peripheral on Freescale Vybrid
SoC's.

Signed-off-by: Sanchayan Maity <maitysanchayan@gmail.com>

2 files changed, 165 insertions, 0 deletions

diff --git a/drivers/usb/host/Makefile b/drivers/usb/host/Makefile
index 7658f87..3b57e56 100644
--- a/drivers/usb/host/Makefile
+++ b/drivers/usb/host/Makefile
@@ -44,6 +44,7 @@ obj-$(CONFIG_USB_EHCI_SUNXI) += ehci-sunxi.o
 obj-$(CONFIG_USB_EHCI_TEGRA) += ehci-tegra.o
 obj-$(CONFIG_USB_EHCI_UNIPHIER) += ehci-uniphier.o
 obj-$(CONFIG_USB_EHCI_VCT) += ehci-vct.o
+obj-$(CONFIG_USB_EHCI_VF) += ehci-vf.o
 obj-$(CONFIG_USB_EHCI_RMOBILE) += ehci-rmobile.o
 obj-$(CONFIG_USB_EHCI_ZYNQ) += ehci-zynq.o
 
diff --git a/drivers/usb/host/ehci-vf.c b/drivers/usb/host/ehci-vf.c
new file mode 100644
index 0000000..5454855
--- /dev/null
+++ b/drivers/usb/host/ehci-vf.c
@@ -0,0 +1,164 @@
+/*
+ * Copyright (c) 2015 Sanchayan Maity <sanchayan.maity@toradex.com>
+ * Copyright (C) 2015 Toradex AG
+ *
+ * Based on ehci-mx6 driver
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <usb.h>
+#include <errno.h>
+#include <linux/compiler.h>
+#include <asm/io.h>
+#include <asm/arch/clock.h>
+#include <asm/arch/imx-regs.h>
+#include <asm/arch/crm_regs.h>
+#include <asm/imx-common/iomux-v3.h>
+#include <asm/imx-common/regs-usbphy.h>
+#include <usb/ehci-fsl.h>
+
+#include "ehci.h"
+
+#define USB_NC_REG_OFFSET				0x00000800
+
+#define ANADIG_PLL_CTRL_EN_USB_CLKS		(1 << 6)
+
+#define UCTRL_OVER_CUR_POL	(1 << 8) /* OTG Polarity of Overcurrent */
+#define UCTRL_OVER_CUR_DIS	(1 << 7) /* Disable OTG Overcurrent Detection */
+
+/* USBCMD */
+#define UCMD_RUN_STOP		(1 << 0) /* controller run/stop */
+#define UCMD_RESET			(1 << 1) /* controller reset */
+
+static const unsigned phy_bases[] = {
+	USB_PHY0_BASE_ADDR,
+	USB_PHY1_BASE_ADDR,
+};
+
+static const unsigned nc_reg_bases[] = {
+	USBC0_BASE_ADDR,
+	USBC1_BASE_ADDR,
+};
+
+static void usb_internal_phy_clock_gate(int index)
+{
+	void __iomem *phy_reg;
+
+	phy_reg = (void __iomem *)phy_bases[index];
+	clrbits_le32(phy_reg + USBPHY_CTRL, USBPHY_CTRL_CLKGATE);
+}
+
+static void usb_power_config(int index)
+{
+	struct anadig_reg __iomem *anadig =
+		(struct anadig_reg __iomem *)ANADIG_BASE_ADDR;
+	void __iomem *pll_ctrl;
+
+	switch (index) {
+	case 0:
+		pll_ctrl = &anadig->pll3_ctrl;
+		clrbits_le32(pll_ctrl, ANADIG_PLL3_CTRL_BYPASS);
+		setbits_le32(pll_ctrl, ANADIG_PLL3_CTRL_ENABLE
+			 | ANADIG_PLL3_CTRL_POWERDOWN
+			 | ANADIG_PLL_CTRL_EN_USB_CLKS);
+		break;
+	case 1:
+		pll_ctrl = &anadig->pll7_ctrl;
+		clrbits_le32(pll_ctrl, ANADIG_PLL7_CTRL_BYPASS);
+		setbits_le32(pll_ctrl, ANADIG_PLL7_CTRL_ENABLE
+			 | ANADIG_PLL7_CTRL_POWERDOWN
+			 | ANADIG_PLL_CTRL_EN_USB_CLKS);
+		break;
+	default:
+		return;
+	}
+}
+
+static void usb_phy_enable(int index, struct usb_ehci *ehci)
+{
+	void __iomem *phy_reg;
+	void __iomem *phy_ctrl;
+	void __iomem *usb_cmd;
+
+	phy_reg = (void __iomem *)phy_bases[index];
+	phy_ctrl = (void __iomem *)(phy_reg + USBPHY_CTRL);
+	usb_cmd = (void __iomem *)&ehci->usbcmd;
+
+	/* Stop then Reset */
+	clrbits_le32(usb_cmd, UCMD_RUN_STOP);
+	while (readl(usb_cmd) & UCMD_RUN_STOP)
+		;
+
+	setbits_le32(usb_cmd, UCMD_RESET);
+	while (readl(usb_cmd) & UCMD_RESET)
+		;
+
+	/* Reset USBPHY module */
+	setbits_le32(phy_ctrl, USBPHY_CTRL_SFTRST);
+	udelay(10);
+
+	/* Remove CLKGATE and SFTRST */
+	clrbits_le32(phy_ctrl, USBPHY_CTRL_CLKGATE | USBPHY_CTRL_SFTRST);
+	udelay(10);
+
+	/* Power up the PHY */
+	writel(0, phy_reg + USBPHY_PWD);
+
+	/* Enable FS/LS device */
+	setbits_le32(phy_ctrl, USBPHY_CTRL_ENUTMILEVEL2 |
+		 USBPHY_CTRL_ENUTMILEVEL3);
+}
+
+static void usb_oc_config(int index)
+{
+	void __iomem *ctrl;
+
+	ctrl = (void __iomem *)(nc_reg_bases[index] + USB_NC_REG_OFFSET);
+
+	setbits_le32(ctrl, UCTRL_OVER_CUR_POL);
+	setbits_le32(ctrl, UCTRL_OVER_CUR_DIS);
+}
+
+int ehci_hcd_init(int index, enum usb_init_type init,
+		struct ehci_hccr **hccr, struct ehci_hcor **hcor)
+{
+	struct usb_ehci *ehci;
+
+	if (index >= ARRAY_SIZE(nc_reg_bases))
+		return -EINVAL;
+
+	if (init == USB_INIT_DEVICE && index == 1)
+		return -ENODEV;
+	if (init == USB_INIT_HOST && index == 0)
+		return -ENODEV;
+
+	ehci = (struct usb_ehci *)nc_reg_bases[index];
+
+	usb_power_config(index);
+	usb_oc_config(index);
+	usb_internal_phy_clock_gate(index);
+	usb_phy_enable(index, ehci);
+
+	*hccr = (struct ehci_hccr *)((uint32_t)&ehci->caplength);
+	*hcor = (struct ehci_hcor *)((uint32_t)*hccr +
+			HC_LENGTH(ehci_readl(&(*hccr)->cr_capbase)));
+
+	if (init == USB_INIT_DEVICE) {
+		setbits_le32(&ehci->usbmode, CM_DEVICE);
+		writel((PORT_PTS_UTMI | PORT_PTS_PTW), &ehci->portsc);
+		setbits_le32(&ehci->portsc, USB_EN);
+	} else if (init == USB_INIT_HOST) {
+		setbits_le32(&ehci->usbmode, CM_HOST);
+		writel((PORT_PTS_UTMI | PORT_PTS_PTW), &ehci->portsc);
+		setbits_le32(&ehci->portsc, USB_EN);
+	}
+
+	return 0;
+}
+
+int ehci_hcd_stop(int index)
+{
+	return 0;
+}