USB: MX5: add generic USB EHCI support for mx51 and mx53

It's derived from ehci-mxc and uses the header files of the
ehci-fsl interface. The callback board_ehci_hcd_init() has
been introduced to allow for board-specific setup when USB
is started.

Signed-off-by: Wolfgang Grandegger <wg@denx.de>
CC: Stefano Babic <sbabic@denx.de>
CC: Remy Bohmer <linux@bohmer.net>

drivers/usb/host/Makefile

@@ -42,6 +42,7 @@ COBJS-$(CONFIG_USB_EHCI_FSL) += ehci-fsl.o
 endif
 COBJS-$(CONFIG_USB_EHCI_MXC) += ehci-mxc.o
 COBJS-$(CONFIG_USB_EHCI_MXS) += ehci-mxs.o
+COBJS-$(CONFIG_USB_EHCI_MX5) += ehci-mx5.o
 COBJS-$(CONFIG_USB_EHCI_PPC4XX) += ehci-ppc4xx.o
 COBJS-$(CONFIG_USB_EHCI_IXP4XX) += ehci-ixp.o
 COBJS-$(CONFIG_USB_EHCI_KIRKWOOD) += ehci-kirkwood.o

drivers/usb/host/ehci-mx5.c

@@ -0,0 +1,174 @@
+/*
+ * Copyright (c) 2009 Daniel Mack <daniel@caiaq.de>
+ * Copyright (C) 2010 Freescale Semiconductor, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * for more details.
+ */
+
+#include <common.h>
+#include <usb.h>
+#include <errno.h>
+#include <linux/compiler.h>
+#include <usb/ehci-fsl.h>
+#include <asm/io.h>
+#include <asm/arch/imx-regs.h>
+#include <asm/arch/clock.h>
+#include <asm/arch/mx5x_pins.h>
+
+#include "ehci.h"
+#include "ehci-core.h"
+
+#define MX5_USBOTHER_REGS_OFFSET 0x800
+
+
+#define MXC_OTG_OFFSET		0
+#define MXC_H1_OFFSET		0x200
+#define MXC_H2_OFFSET		0x400
+
+#define MXC_USBCTRL_OFFSET		0
+#define MXC_USB_PHY_CTR_FUNC_OFFSET	0x8
+#define MXC_USB_PHY_CTR_FUNC2_OFFSET	0xc
+#define MXC_USB_CTRL_1_OFFSET		0x10
+#define MXC_USBH2CTRL_OFFSET		0x14
+
+/* USB_CTRL */
+#define MXC_OTG_UCTRL_OWIE_BIT	(1 << 27) /* OTG wakeup intr enable */
+#define MXC_OTG_UCTRL_OPM_BIT	(1 << 24) /* OTG power mask */
+#define MXC_H1_UCTRL_H1UIE_BIT	(1 << 12) /* Host1 ULPI interrupt enable */
+#define MXC_H1_UCTRL_H1WIE_BIT	(1 << 11) /* HOST1 wakeup intr enable */
+#define MXC_H1_UCTRL_H1PM_BIT	(1 << 8) /* HOST1 power mask */
+
+/* USB_PHY_CTRL_FUNC */
+#define MXC_OTG_PHYCTRL_OC_DIS_BIT (1 << 8) /* OTG Disable Overcurrent Event */
+#define MXC_H1_OC_DIS_BIT	(1 << 5) /* UH1 Disable Overcurrent Event */
+
+/* USBH2CTRL */
+#define MXC_H2_UCTRL_H2UIE_BIT	(1 << 8)
+#define MXC_H2_UCTRL_H2WIE_BIT	(1 << 7)
+#define MXC_H2_UCTRL_H2PM_BIT	(1 << 4)
+
+/* USB_CTRL_1 */
+#define MXC_USB_CTRL_UH1_EXT_CLK_EN		(1 << 25)
+
+int mxc_set_usbcontrol(int port, unsigned int flags)
+{
+	unsigned int v;
+	void __iomem *usb_base = (void __iomem *)OTG_BASE_ADDR;
+	void __iomem *usbother_base;
+	int ret = 0;
+
+	usbother_base = usb_base + MX5_USBOTHER_REGS_OFFSET;
+
+	switch (port) {
+	case 0:	/* OTG port */
+		if (flags & MXC_EHCI_INTERNAL_PHY) {
+			v = __raw_readl(usbother_base +
+					MXC_USB_PHY_CTR_FUNC_OFFSET);
+			if (flags & MXC_EHCI_POWER_PINS_ENABLED)
+				/* OC/USBPWR is not used */
+				v |= MXC_OTG_PHYCTRL_OC_DIS_BIT;
+			else
+				/* OC/USBPWR is used */
+				v &= ~MXC_OTG_PHYCTRL_OC_DIS_BIT;
+			__raw_writel(v, usbother_base +
+					MXC_USB_PHY_CTR_FUNC_OFFSET);
+
+			v = __raw_readl(usbother_base + MXC_USBCTRL_OFFSET);
+			if (flags & MXC_EHCI_POWER_PINS_ENABLED)
+				v |= MXC_OTG_UCTRL_OPM_BIT;
+			else
+				v &= ~MXC_OTG_UCTRL_OPM_BIT;
+			__raw_writel(v, usbother_base + MXC_USBCTRL_OFFSET);
+		}
+		break;
+	case 1:	/* Host 1 Host ULPI */
+#ifdef CONFIG_MX51
+		/* The clock for the USBH1 ULPI port will come externally
+		   from the PHY. */
+		v = __raw_readl(usbother_base + MXC_USB_CTRL_1_OFFSET);
+		__raw_writel(v | MXC_USB_CTRL_UH1_EXT_CLK_EN, usbother_base +
+				MXC_USB_CTRL_1_OFFSET);
+#endif
+
+		v = __raw_readl(usbother_base + MXC_USBCTRL_OFFSET);
+		if (flags & MXC_EHCI_POWER_PINS_ENABLED)
+			v &= ~MXC_H1_UCTRL_H1PM_BIT; /* HOST1 power mask used */
+		else
+			v |= MXC_H1_UCTRL_H1PM_BIT; /* HOST1 power mask used */
+		__raw_writel(v, usbother_base + MXC_USBCTRL_OFFSET);
+
+		v = __raw_readl(usbother_base + MXC_USB_PHY_CTR_FUNC_OFFSET);
+		if (flags & MXC_EHCI_POWER_PINS_ENABLED)
+			v &= ~MXC_H1_OC_DIS_BIT; /* OC is used */
+		else
+			v |= MXC_H1_OC_DIS_BIT; /* OC is not used */
+		__raw_writel(v, usbother_base + MXC_USB_PHY_CTR_FUNC_OFFSET);
+
+		break;
+	case 2: /* Host 2 ULPI */
+		v = __raw_readl(usbother_base + MXC_USBH2CTRL_OFFSET);
+		if (flags & MXC_EHCI_POWER_PINS_ENABLED)
+			v &= ~MXC_H2_UCTRL_H2PM_BIT; /* HOST2 power mask used */
+		else
+			v |= MXC_H2_UCTRL_H2PM_BIT; /* HOST2 power mask used */
+
+		__raw_writel(v, usbother_base + MXC_USBH2CTRL_OFFSET);
+		break;
+	}
+
+	return ret;
+}
+
+int ehci_hcd_init(void)
+{
+	struct usb_ehci *ehci;
+#ifdef CONFIG_MX53
+	struct clkctl *sc_regs = (struct clkctl *)CCM_BASE_ADDR;
+	u32 reg;
+
+	reg = __raw_readl(&sc_regs->cscmr1) & ~(1 << 26);
+	/* derive USB PHY clock multiplexer from PLL3 */
+	reg |= 1 << 26;
+	__raw_writel(reg, &sc_regs->cscmr1);
+#endif
+
+	set_usboh3_clk();
+	enable_usboh3_clk(1);
+	set_usb_phy2_clk();
+	enable_usb_phy2_clk(1);
+	mdelay(1);
+
+	/* do board specific initialization */
+	board_ehci_hcd_init(CONFIG_MXC_USB_PORT);
+
+	ehci = (struct usb_ehci *)(OTG_BASE_ADDR +
+		(0x200 * CONFIG_MXC_USB_PORT));
+	hccr = (struct ehci_hccr *)((uint32_t)&ehci->caplength);
+	hcor = (struct ehci_hcor *)((uint32_t)hccr +
+			HC_LENGTH(ehci_readl(&hccr->cr_capbase)));
+	setbits_le32(&ehci->usbmode, CM_HOST);
+
+	__raw_writel(CONFIG_MXC_USB_PORTSC, &ehci->portsc);
+	setbits_le32(&ehci->portsc, USB_EN);
+
+	mxc_set_usbcontrol(CONFIG_MXC_USB_PORT, CONFIG_MXC_USB_FLAGS);
+
+	mdelay(10);
+
+	return 0;
+}
+
+int ehci_hcd_stop(void)
+{
+	return 0;
+}
+
+

include/usb/ehci-fsl.h

@@ -243,4 +243,14 @@ struct usb_ehci {
 	u8	res14[0xafc];
 };
 
+/*
+ * For MXC SOCs
+ */
+#define MXC_EHCI_POWER_PINS_ENABLED	(1 << 5)
+#define MXC_EHCI_TTL_ENABLED		(1 << 6)
+#define MXC_EHCI_INTERNAL_PHY		(1 << 7)
+
+/* Board-specific initialization */
+int board_ehci_hcd_init(int port);
+
 #endif /* _EHCI_FSL_H */