[PATCH] mx53loco: USB EHCI for MX5

Wolfgang Grandegger wg at denx.de
Mon Nov 7 15:48:00 CET 2011


Signed-off-by: Wolfgang Grandegger <wg at denx.de>
---
 arch/arm/cpu/armv7/mx5/clock.c            |   72 ++++++++++++
 arch/arm/include/asm/arch-mx5/clock.h     |    5 +
 arch/arm/include/asm/arch-mx5/crm_regs.h  |    3 +
 arch/arm/include/asm/arch-mx5/imx-regs.h  |   33 ++++++
 arch/arm/include/asm/arch-mx5/mx5x_pins.h |    4 +
 board/freescale/mx53loco/mx53loco.c       |   11 ++
 drivers/usb/host/Makefile                 |    1 +
 drivers/usb/host/ehci-mx5.c               |  174 +++++++++++++++++++++++++++++
 include/configs/mx53loco.h                |   13 ++
 9 files changed, 316 insertions(+), 0 deletions(-)
 create mode 100644 drivers/usb/host/ehci-mx5.c

diff --git a/arch/arm/cpu/armv7/mx5/clock.c b/arch/arm/cpu/armv7/mx5/clock.c
index 0769a64..c8dad17 100644
--- a/arch/arm/cpu/armv7/mx5/clock.c
+++ b/arch/arm/cpu/armv7/mx5/clock.c
@@ -50,6 +50,78 @@ struct mxc_pll_reg *mxc_plls[PLL_CLOCKS] = {
 
 struct mxc_ccm_reg *mxc_ccm = (struct mxc_ccm_reg *)MXC_CCM_BASE;
 
+void set_usboh3_clk(void)
+{
+	unsigned int reg;
+
+	reg = readl(&mxc_ccm->cscmr1) &
+		 ~MXC_CCM_CSCMR1_USBOH3_CLK_SEL_MASK;
+	reg |= 1 << MXC_CCM_CSCMR1_USBOH3_CLK_SEL_OFFSET;
+	writel(reg, &mxc_ccm->cscmr1);
+
+	reg = readl(&mxc_ccm->cscdr1);
+	reg &= ~MXC_CCM_CSCDR1_USBOH3_CLK_PODF_MASK;
+	reg &= ~MXC_CCM_CSCDR1_USBOH3_CLK_PRED_MASK;
+	reg |= 4 << MXC_CCM_CSCDR1_USBOH3_CLK_PRED_OFFSET;
+	reg |= 1 << MXC_CCM_CSCDR1_USBOH3_CLK_PODF_OFFSET;
+
+	writel(reg, &mxc_ccm->cscdr1);
+}
+
+void enable_usboh3_clk(unsigned char enable)
+{
+	unsigned int reg;
+
+	reg = readl(&mxc_ccm->CCGR2);
+	if (enable)
+		reg |= 1 << MXC_CCM_CCGR2_CG14_OFFSET;
+	else
+		reg &= ~(1 << MXC_CCM_CCGR2_CG14_OFFSET);
+	writel(reg, &mxc_ccm->CCGR2);
+}
+
+void set_usb_phy1_clk(void)
+{
+	unsigned int reg;
+
+	reg = readl(&mxc_ccm->cscmr1);
+	reg &= ~MXC_CCM_CSCMR1_USB_PHY_CLK_SEL;
+	writel(reg, &mxc_ccm->cscmr1);
+}
+
+void enable_usb_phy1_clk(unsigned char enable)
+{
+	unsigned int reg;
+
+	reg = readl(&mxc_ccm->CCGR4);
+	if (enable)
+		reg |= 1 << MXC_CCM_CCGR4_CG5_OFFSET;
+	else
+		reg &= ~(1 << MXC_CCM_CCGR4_CG5_OFFSET);
+	writel(reg, &mxc_ccm->CCGR4);
+}
+
+void set_usb_phy2_clk(void)
+{
+	unsigned int reg;
+
+	reg = readl(&mxc_ccm->cscmr1);
+	reg &= ~MXC_CCM_CSCMR1_USB_PHY_CLK_SEL;
+	writel(reg, &mxc_ccm->cscmr1);
+}
+
+void enable_usb_phy2_clk(unsigned char enable)
+{
+	unsigned int reg;
+
+	reg = readl(&mxc_ccm->CCGR4);
+	if (enable)
+		reg |= 1 << MXC_CCM_CCGR4_CG6_OFFSET;
+	else
+		reg &= ~(1 << MXC_CCM_CCGR4_CG6_OFFSET);
+	writel(reg, &mxc_ccm->CCGR4);
+}
+
 /*
  * Calculate the frequency of PLLn.
  */
diff --git a/arch/arm/include/asm/arch-mx5/clock.h b/arch/arm/include/asm/arch-mx5/clock.h
index 1f8a537..ea972a3 100644
--- a/arch/arm/include/asm/arch-mx5/clock.h
+++ b/arch/arm/include/asm/arch-mx5/clock.h
@@ -40,4 +40,9 @@ u32 imx_get_uartclk(void);
 u32 imx_get_fecclk(void);
 unsigned int mxc_get_clock(enum mxc_clock clk);
 
+void set_usb_phy2_clk(void);
+void enable_usb_phy2_clk(unsigned char enable);
+void set_usboh3_clk(void);
+void enable_usboh3_clk(unsigned char enable);
+
 #endif /* __ASM_ARCH_CLOCK_H */
diff --git a/arch/arm/include/asm/arch-mx5/crm_regs.h b/arch/arm/include/asm/arch-mx5/crm_regs.h
index fcc0e36..7972147 100644
--- a/arch/arm/include/asm/arch-mx5/crm_regs.h
+++ b/arch/arm/include/asm/arch-mx5/crm_regs.h
@@ -195,7 +195,10 @@ struct mxc_ccm_reg {
 /* Define the bits in register CCGRx */
 #define MXC_CCM_CCGR_CG_MASK				0x3
 
+#define MXC_CCM_CCGR4_CG5_OFFSET                        10
+#define MXC_CCM_CCGR4_CG6_OFFSET			12
 #define MXC_CCM_CCGR5_CG5_OFFSET			10
+#define MXC_CCM_CCGR2_CG14_OFFSET                       28
 
 /* Define the bits in register CLPCR */
 #define MXC_CCM_CLPCR_BYPASS_IPU_LPM_HS                 (0x1 << 18)
diff --git a/arch/arm/include/asm/arch-mx5/imx-regs.h b/arch/arm/include/asm/arch-mx5/imx-regs.h
index d069209..1ac9705 100644
--- a/arch/arm/include/asm/arch-mx5/imx-regs.h
+++ b/arch/arm/include/asm/arch-mx5/imx-regs.h
@@ -134,6 +134,39 @@
 #define SAHARA_BASE_ADDR	(AIPS2_BASE_ADDR + 0x000F8000)
 
 /*
+ * USB
+ */
+#define MXC_USBCTRL_OFFSET              0
+#define MXC_USB_PHY_CTR_FUNC_OFFSET     0x8
+#define MXC_USB_PHY_CTR_FUNC2_OFFSET    0xc
+#define MXC_USBH2CTRL_OFFSET            0x14
+
+/* Values for portsc field */
+#define MXC_EHCI_PHY_LOW_POWER_SUSPEND	(1 << 23)
+#define MXC_EHCI_FORCE_FS		(1 << 24)
+#define MXC_EHCI_UTMI_8BIT		(0 << 28)
+#define MXC_EHCI_UTMI_16BIT		(1 << 28)
+#define MXC_EHCI_SERIAL			(1 << 29)
+#define MXC_EHCI_MODE_UTMI		(0 << 30)
+#define MXC_EHCI_MODE_PHILIPS		(1 << 30)
+#define MXC_EHCI_MODE_ULPI		(2 << 30)
+#define MXC_EHCI_MODE_SERIAL		(3 << 30)
+
+/* Values for flags field */
+#define MXC_EHCI_INTERFACE_DIFF_UNI	(0 << 0)
+#define MXC_EHCI_INTERFACE_DIFF_BI	(1 << 0)
+#define MXC_EHCI_INTERFACE_SINGLE_UNI	(2 << 0)
+#define MXC_EHCI_INTERFACE_SINGLE_BI	(3 << 0)
+#define MXC_EHCI_INTERFACE_MASK		(0xf)
+
+#define MXC_EHCI_POWER_PINS_ENABLED	(1 << 5)
+#define MXC_EHCI_TTL_ENABLED		(1 << 6)
+
+#define MXC_EHCI_INTERNAL_PHY		(1 << 7)
+#define MXC_EHCI_IPPUE_DOWN		(1 << 8)
+#define MXC_EHCI_IPPUE_UP		(1 << 9)
+
+/*
  * WEIM CSnGCR1
  */
 #define CSEN		1
diff --git a/arch/arm/include/asm/arch-mx5/mx5x_pins.h b/arch/arm/include/asm/arch-mx5/mx5x_pins.h
index 4e3a31b..3978bd5 100644
--- a/arch/arm/include/asm/arch-mx5/mx5x_pins.h
+++ b/arch/arm/include/asm/arch-mx5/mx5x_pins.h
@@ -25,6 +25,10 @@
 
 #ifndef __ASSEMBLY__
 
+/* There's a off-by-one betweem the gpio bank number and the gpiochip */
+/* range e.g. GPIO_1_5 is gpio 5 under linux */
+#define IMX_GPIO_NR(bank, nr)           (((bank) - 1) * 32 + (nr))
+
 /*
  * In order to identify pins more effectively, each mux-controlled pin's
  * enumerated value is constructed in the following way:
diff --git a/board/freescale/mx53loco/mx53loco.c b/board/freescale/mx53loco/mx53loco.c
index 156f8b5..b867714 100644
--- a/board/freescale/mx53loco/mx53loco.c
+++ b/board/freescale/mx53loco/mx53loco.c
@@ -83,6 +83,16 @@ static void setup_iomux_uart(void)
 				PAD_CTL_ODE_OPENDRAIN_ENABLE);
 }
 
+static void setup_usb_h1(void)
+{
+	/* request VBUS power enable pin, GPIO[8}, gpio7 */
+	mxc_request_iomux(MX53_PIN_ATA_DA_2, IOMUX_CONFIG_ALT1);
+
+	gpio_direction_output(IMX_GPIO_NR(7, 8), 0);
+
+	gpio_set_value(IMX_GPIO_NR(7, 8), 1);
+}
+
 static void setup_iomux_fec(void)
 {
 	/*FEC_MDIO*/
@@ -282,6 +292,7 @@ int board_early_init_f(void)
 {
 	setup_iomux_uart();
 	setup_iomux_fec();
+	setup_usb_h1();
 
 	return 0;
 }
diff --git a/drivers/usb/host/Makefile b/drivers/usb/host/Makefile
index 51b2494..60632ba 100644
--- a/drivers/usb/host/Makefile
+++ b/drivers/usb/host/Makefile
@@ -41,6 +41,7 @@ else
 COBJS-$(CONFIG_USB_EHCI_FSL) += ehci-fsl.o
 endif
 COBJS-$(CONFIG_USB_EHCI_MXC) += ehci-mxc.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
diff --git a/drivers/usb/host/ehci-mx5.c b/drivers/usb/host/ehci-mx5.c
new file mode 100644
index 0000000..9f3e654
--- /dev/null
+++ b/drivers/usb/host/ehci-mx5.c
@@ -0,0 +1,174 @@
+/*
+ * Copyright (c) 2009 Daniel Mack <daniel at 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
+
+/* 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)
+
+#define MXC_USBCMD_OFFSET	0x140
+
+int mxc_set_usbcontrol(int port, unsigned int flags)
+{
+	unsigned int v;
+	void __iomem *usb_base;
+	void __iomem *usbotg_base;
+	void __iomem *usbother_base;
+	int ret = 0;
+
+	usb_base = OTG_BASE_ADDR;
+
+	switch (port) {
+	case 0:	/* OTG port */
+		usbotg_base = usb_base + MXC_OTG_OFFSET;
+		break;
+	case 1:	/* Host 1 port */
+		usbotg_base = usb_base + MXC_H1_OFFSET;
+		break;
+	case 2: /* Host 2 port */
+		usbotg_base = usb_base + MXC_H2_OFFSET;
+		break;
+	default:
+		return -EINVAL;
+	}
+	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 */
+		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;
+	}
+
+error:
+	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);
+
+	udelay(80);
+
+	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);
+
+#ifdef CONFIG_MX53
+	setbits_le32(&ehci->portsc, USB_EN);
+	__raw_writel(CONFIG_MXC_USB_PORTSC, &ehci->portsc);
+#endif
+
+	mxc_set_usbcontrol(CONFIG_MXC_USB_PORT, CONFIG_MXC_USB_FLAGS);
+
+	udelay(10000);
+
+	return 0;
+}
+
+int ehci_hcd_stop(void)
+{
+	return 0;
+}
diff --git a/include/configs/mx53loco.h b/include/configs/mx53loco.h
index c3e4e13..aad7368 100644
--- a/include/configs/mx53loco.h
+++ b/include/configs/mx53loco.h
@@ -181,4 +181,17 @@
 
 #define CONFIG_OF_LIBFDT
 
+/* USB support */
+#define CONFIG_CMD_USB
+#define CONFIG_CMD_FAT
+#define CONFIG_USB_EHCI
+#define CONFIG_USB_EHCI_MX5
+#define CONFIG_USB_STORAGE
+#define CONFIG_USB_HOST_ETHER
+#define CONFIG_USB_ETHER_ASIX
+#define CONFIG_USB_ETHER_SMSC95XX
+#define CONFIG_MXC_USB_PORT	1
+#define CONFIG_MXC_USB_PORTSC	(MXC_EHCI_MODE_UTMI | MXC_EHCI_UTMI_16BIT)
+#define CONFIG_MXC_USB_FLAGS	0
+
 #endif				/* __CONFIG_H */
-- 
1.7.6.4







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