[U-Boot] [PATCH v2 1/2] usb/ehci: Add USB support for the MX6Q

Wolfgang Grandegger
2012-02-09T08:33:25Z

Currently, only USB Host 1 is supported.

Cc: Remy Bohmer <linux@bohmer.net>
Signed-off-by: Wolfgang Grandegger <wg@denx.de>
---
arch/arm/cpu/armv7/mx6/clock.c | 13 ++
arch/arm/include/asm/arch-mx6/clock.h | 1 +
arch/arm/include/asm/arch-mx6/imx-regs.h | 3 +
drivers/usb/host/Makefile | 1 +
drivers/usb/host/ehci-mx6.c | 205 ++++++++++++++++++++++++++++++
5 files changed, 223 insertions(+), 0 deletions(-)
create mode 100644 drivers/usb/host/ehci-mx6.c

diff --git a/arch/arm/cpu/armv7/mx6/clock.c b/arch/arm/cpu/armv7/mx6/clock.c
index fa3a124..ef98563 100644
--- a/arch/arm/cpu/armv7/mx6/clock.c
+++ b/arch/arm/cpu/armv7/mx6/clock.c
@@ -36,6 +36,19 @@ enum pll_clocks {

struct imx_ccm_reg *imx_ccm = (struct imx_ccm_reg *)CCM_BASE_ADDR;

+void enable_usboh3_clk(unsigned char enable)
+{
+ u32 reg;
+
+ reg = __raw_readl(&imx_ccm->CCGR6);
+ if (enable)
+ reg |= MXC_CCM_CCGR_CG_MASK << MXC_CCM_CCGR0_CG0_OFFSET;
+ else
+ reg &= ~(MXC_CCM_CCGR_CG_MASK << MXC_CCM_CCGR0_CG0_OFFSET);
+ __raw_writel(reg, &imx_ccm->CCGR6);
+
+}
+
static u32 decode_pll(enum pll_clocks pll, u32 infreq)
{
u32 div;
diff --git a/arch/arm/include/asm/arch-mx6/clock.h b/arch/arm/include/asm/arch-mx6/clock.h
index 636458f..613809b 100644
--- a/arch/arm/include/asm/arch-mx6/clock.h
+++ b/arch/arm/include/asm/arch-mx6/clock.h
@@ -46,5 +46,6 @@ enum mxc_clock {
u32 imx_get_uartclk(void);
u32 imx_get_fecclk(void);
unsigned int mxc_get_clock(enum mxc_clock clk);
+void enable_usboh3_clk(unsigned char enable);

#endif /* __ASM_ARCH_CLOCK_H */
diff --git a/arch/arm/include/asm/arch-mx6/imx-regs.h b/arch/arm/include/asm/arch-mx6/imx-regs.h
index 3b5fd25..2bfe891 100644
--- a/arch/arm/include/asm/arch-mx6/imx-regs.h
+++ b/arch/arm/include/asm/arch-mx6/imx-regs.h
@@ -111,6 +111,9 @@
#define KPP_BASE_ADDR (AIPS1_OFF_BASE_ADDR + 0x38000)
#define WDOG1_BASE_ADDR (AIPS1_OFF_BASE_ADDR + 0x3C000)
#define WDOG2_BASE_ADDR (AIPS1_OFF_BASE_ADDR + 0x40000)
+#define ANATOP_BASE_ADDR (AIPS1_OFF_BASE_ADDR + 0x48000)
+#define USB_PHY0_BASE_ADDR (AIPS1_OFF_BASE_ADDR + 0x49000)
+#define USB_PHY1_BASE_ADDR (AIPS1_OFF_BASE_ADDR + 0x4a000)
#define CCM_BASE_ADDR (AIPS1_OFF_BASE_ADDR + 0x44000)
#define ANATOP_BASE_ADDR (AIPS1_OFF_BASE_ADDR + 0x48000)
#define SNVS_BASE_ADDR (AIPS1_OFF_BASE_ADDR + 0x4C000)
diff --git a/drivers/usb/host/Makefile b/drivers/usb/host/Makefile
index 77e217f..1b62cc2 100644
--- a/drivers/usb/host/Makefile
+++ b/drivers/usb/host/Makefile
@@ -43,6 +43,7 @@ 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_MX6) += ehci-mx6.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-mx6.c b/drivers/usb/host/ehci-mx6.c
new file mode 100644
index 0000000..b7bf49d
--- /dev/null
+++ b/drivers/usb/host/ehci-mx6.c
@@ -0,0 +1,205 @@
+/*
+ * 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/mx6x_pins.h>
+#include <asm/arch/iomux-v3.h>
+
+#include "ehci.h"
+#include "ehci-core.h"
+
+#define USB_OTGREGS_OFFSET 0x000
+#define USB_H1REGS_OFFSET 0x200
+#define USB_H2REGS_OFFSET 0x400
+#define USB_H3REGS_OFFSET 0x600
+#define USB_OTHERREGS_OFFSET 0x800
+
+#define USB_H1_CTRL_OFFSET 0x04
+
+#define USBPHY_CTRL 0x00000030
+#define USBPHY_CTRL_SET 0x00000034
+#define USBPHY_CTRL_CLR 0x00000038
+#define USBPHY_CTRL_TOG 0x0000003c
+
+#define USBPHY_PWD 0x00000000
+#define USBPHY_CTRL_SFTRST 0x80000000
+#define USBPHY_CTRL_CLKGATE 0x40000000
+#define USBPHY_CTRL_ENUTMILEVEL3 0x00008000
+#define USBPHY_CTRL_ENUTMILEVEL2 0x00004000
+
+#define ANADIG_USB2_CHRG_DETECT 0x00000210
+#define ANADIG_USB2_CHRG_DETECT_EN_B 0x00100000
+#define ANADIG_USB2_CHRG_DETECT_CHK_CHRG_B 0x00080000
+
+#define ANADIG_USB2_PLL_480_CTRL 0x00000020
+#define ANADIG_USB2_PLL_480_CTRL_SET 0x00000024
+#define ANADIG_USB2_PLL_480_CTRL_CLR 0x00000028
+#define ANADIG_USB2_PLL_480_CTRL_BYPASS 0x00010000
+#define ANADIG_USB2_PLL_480_CTRL_ENABLE 0x00002000
+#define ANADIG_USB2_PLL_480_CTRL_POWER 0x00001000
+#define ANADIG_USB2_PLL_480_CTRL_EN_USB_CLKS 0x00000040
+
+
+#define UCTRL_OVER_CUR_POL (1 << 8) /* OTG Polarity of Overcurrent */
+#define UCTRL_OVER_CUR_DIS (1 << 7) /* Disable OTG Overcurrent Detection */
+
+/* USBCMD */
+#define UH1_USBCMD_OFFSET 0x140
+#define UCMD_RUN_STOP (1 << 0) /* controller run/stop */
+#define UCMD_RESET (1 << 1) /* controller reset */
+
+static void usbh1_internal_phy_clock_gate(int on)
+{
+ void __iomem *phy_reg = (void __iomem *)USB_PHY1_BASE_ADDR;
+
+ phy_reg += on ? USBPHY_CTRL_CLR : USBPHY_CTRL_SET;
+ __raw_writel(USBPHY_CTRL_CLKGATE, phy_reg);
+}
+
+static void usbh1_power_config(void)
+{
+ void __iomem *anatop_base = (void __iomem *)ANATOP_BASE_ADDR;
+
+ /*
+ * Some phy and power's special controls for host1
+ * 1. The external charger detector needs to be disabled
+ * or the signal at DP will be poor
+ * 2. The PLL's power and output to usb for host 1
+ * is totally controlled by IC, so the Software only needs
+ * to enable them@initializtion.
+ */
+ __raw_writel(ANADIG_USB2_CHRG_DETECT_EN_B |
+ ANADIG_USB2_CHRG_DETECT_CHK_CHRG_B,
+ anatop_base + ANADIG_USB2_CHRG_DETECT);
+
+ __raw_writel(ANADIG_USB2_PLL_480_CTRL_BYPASS,
+ anatop_base + ANADIG_USB2_PLL_480_CTRL_CLR);
+
+ __raw_writel(ANADIG_USB2_PLL_480_CTRL_ENABLE |
+ ANADIG_USB2_PLL_480_CTRL_POWER |
+ ANADIG_USB2_PLL_480_CTRL_EN_USB_CLKS,
+ anatop_base + ANADIG_USB2_PLL_480_CTRL_SET);
+}
+
+static int usbh1_phy_enable(void)
+{
+ void __iomem *phy_reg = (void __iomem *)USB_PHY1_BASE_ADDR;
+ void __iomem *phy_ctrl = (void __iomem *)(phy_reg + USBPHY_CTRL);
+ void __iomem *usb_cmd = (void __iomem *)(USBOH3_USB_BASE_ADDR +
+ USB_H1REGS_OFFSET +
+ UH1_USBCMD_OFFSET);
+ u32 val;
+
+ /* Stop then Reset */
+ val = __raw_readl(usb_cmd);
+ val &= ~UCMD_RUN_STOP;
+ __raw_writel(val, usb_cmd);
+ while (__raw_readl(usb_cmd) & UCMD_RUN_STOP)
+ ;
+
+ val = __raw_readl(usb_cmd);
+ val |= UCMD_RESET;
+ __raw_writel(val, usb_cmd);
+ while (__raw_readl(usb_cmd) & UCMD_RESET)
+ ;
+
+ /* Reset USBPHY module */
+ val = __raw_readl(phy_ctrl);
+ val |= USBPHY_CTRL_SFTRST;
+ __raw_writel(val, phy_ctrl);
+ udelay(10);
+
+ /* Remove CLKGATE and SFTRST */
+ val = __raw_readl(phy_ctrl);
+ val &= ~(USBPHY_CTRL_CLKGATE | USBPHY_CTRL_SFTRST);
+ __raw_writel(val, phy_ctrl);
+ udelay(10);
+
+ /* Power up the PHY */
+ __raw_writel(0, phy_reg + USBPHY_PWD);
+ /* enable FS/LS device */
+ val = __raw_readl(phy_reg + USBPHY_CTRL);
+ val |= (USBPHY_CTRL_ENUTMILEVEL2 | USBPHY_CTRL_ENUTMILEVEL3);
+ __raw_writel(val, phy_reg + USBPHY_CTRL);
+
+ return 0;
+}
+
+static void usbh1_oc_config(void)
+{
+ void __iomem *usb_base = (void __iomem *)USBOH3_USB_BASE_ADDR;
+ void __iomem *usbother_base = usb_base + USB_OTHERREGS_OFFSET;
+ u32 val;
+
+ val = __raw_readl(usbother_base + USB_H1_CTRL_OFFSET);
+#if CONFIG_MACH_TYPE == MACH_TYPE_MX6Q_ARM2
+ /* mx6qarm2 seems to required a different setting*/
+ val &= ~UCTRL_OVER_CUR_POL;
+#else
+ val |= UCTRL_OVER_CUR_POL;
+#endif
+ __raw_writel(val, usbother_base + USB_H1_CTRL_OFFSET);
+
+ val = __raw_readl(usbother_base + USB_H1_CTRL_OFFSET);
+ val |= UCTRL_OVER_CUR_DIS;
+ __raw_writel(val, usbother_base + USB_H1_CTRL_OFFSET);
+}
+
+int ehci_hcd_init(void)
+{
+ struct usb_ehci *ehci;
+
+ enable_usboh3_clk(1);
+ mdelay(1);
+
+ /* Do board specific initialization */
+ board_ehci_hcd_init(CONFIG_MXC_USB_PORT);
+
+#if CONFIG_MXC_USB_PORT == 1
+ /* USB Host 1 */
+ usbh1_power_config();
+ usbh1_oc_config();
+ usbh1_internal_phy_clock_gate(1);
+ usbh1_phy_enable();
+#else
+#error "MXC USB port not yet supported"
+#endif
+
+ ehci = (struct usb_ehci *)(USBOH3_USB_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);
+
+ mdelay(10);
+
+ return 0;
+}
+
+int ehci_hcd_stop(void)
+{
+ return 0;
+}
--
1.7.7.6