[U-Boot] [PATCH 2/4] musb: MSC host support for AM35x
Ajay Kumar Gupta
ajay.gupta at ti.com
Wed Jul 7 13:57:38 CEST 2010
Tested MSC Host on AM3517EVM.
Signed-off-by: Ajay Kumar Gupta <ajay.gupta at ti.com>
---
drivers/usb/musb/Makefile | 1 +
drivers/usb/musb/am35x.c | 118 +++++++++++++++++++++++++++++++++++++++++++
drivers/usb/musb/am35x.h | 94 ++++++++++++++++++++++++++++++++++
drivers/usb/musb/musb_udc.c | 2 +
include/usb.h | 2 +-
5 files changed, 216 insertions(+), 1 deletions(-)
create mode 100644 drivers/usb/musb/am35x.c
create mode 100644 drivers/usb/musb/am35x.h
diff --git a/drivers/usb/musb/Makefile b/drivers/usb/musb/Makefile
index 397f5fe..7d23e06 100644
--- a/drivers/usb/musb/Makefile
+++ b/drivers/usb/musb/Makefile
@@ -31,6 +31,7 @@ COBJS-$(CONFIG_USB_BLACKFIN) += blackfin_usb.o
COBJS-$(CONFIG_USB_DAVINCI) += davinci.o
COBJS-$(CONFIG_USB_OMAP3) += omap3.o
COBJS-$(CONFIG_USB_DA8XX) += da8xx.o
+COBJS-$(CONFIG_USB_AM35X) += am35x.o
COBJS := $(COBJS-y)
SRCS := $(COBJS:.o=.c)
diff --git a/drivers/usb/musb/am35x.c b/drivers/usb/musb/am35x.c
new file mode 100644
index 0000000..2024940
--- /dev/null
+++ b/drivers/usb/musb/am35x.c
@@ -0,0 +1,118 @@
+/*
+ * am35x.c - TI's AM35x platform specific usb wrapper functions.
+ *
+ * Author: Ajay Kumar Gupta <ajay.gupta at ti.com>
+ *
+ * Based on drivers/usb/musb/da8xx.c
+ *
+ * Copyright (c) 2010 Texas Instruments Incorporated
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+#include <common.h>
+
+#include "am35x.h"
+
+/* MUSB platform configuration */
+struct musb_config musb_cfg = {
+ .regs = (struct musb_regs *)AM35X_USB_OTG_CORE_BASE,
+ .timeout = AM35X_USB_OTG_TIMEOUT,
+ .musb_speed = 0,
+};
+
+/*
+ * Enable the USB phy
+ */
+static u8 phy_on(void)
+{
+ u32 devconf2;
+ u32 timeout;
+
+ devconf2 = readl(&am35x_scm_general_regs->devconf2);
+
+ devconf2 &= ~(DEVCONF2_RESET | DEVCONF2_PHYPWRDN | DEVCONF2_OTGPWRDN |
+ DEVCONF2_OTGMODE | DEVCONF2_REFFREQ |
+ DEVCONF2_PHY_GPIOMODE);
+ devconf2 |= DEVCONF2_SESENDEN | DEVCONF2_VBDTCTEN | DEVCONF2_PHY_PLLON |
+ DEVCONF2_REFFREQ_13MHZ | DEVCONF2_DATPOL;
+
+ writel(devconf2, &am35x_scm_general_regs->devconf2);
+
+ /* wait until the USB phy is turned on */
+ timeout = musb_cfg.timeout;
+ while (timeout--)
+ if (readl(&am35x_scm_general_regs->devconf2) & DEVCONF2_PHYCKGD)
+ return 1;
+
+ /* USB phy was not turned on */
+ return 0;
+}
+
+/*
+ * Disable the USB phy
+ */
+static void phy_off(void)
+{
+ u32 devconf2;
+
+ /*
+ * Power down the on-chip PHY.
+ */
+ devconf2 = readl(&am35x_scm_general_regs->devconf2);
+
+ devconf2 &= ~DEVCONF2_PHY_PLLON;
+ devconf2 |= DEVCONF2_PHYPWRDN | DEVCONF2_OTGPWRDN;
+ writel(devconf2, &am35x_scm_general_regs->devconf2);
+}
+
+/*
+ * This function performs platform specific initialization for usb0.
+ */
+int musb_platform_init(void)
+{
+ u32 revision;
+ u32 sw_reset;
+
+ /* global usb reset */
+ sw_reset = readl(&am35x_scm_general_regs->ip_sw_reset);
+ sw_reset |= (1 << 0);
+ writel(sw_reset, &am35x_scm_general_regs->ip_sw_reset);
+ sw_reset &= ~(1 << 0);
+ writel(sw_reset, &am35x_scm_general_regs->ip_sw_reset);
+
+ /* reset the controller */
+ writel(0x1, &am35x_usb_regs->control);
+ udelay(5000);
+
+ /* start the on-chip usb phy and its pll */
+ if (phy_on() == 0)
+ return -1;
+
+ /* Returns zero if e.g. not clocked */
+ revision = readl(&am35x_usb_regs->revision);
+ if (revision == 0)
+ return -1;
+
+ return 0;
+}
+
+/*
+ * This function performs platform specific deinitialization for usb0.
+ */
+void musb_platform_deinit(void)
+{
+ /* Turn off the phy */
+ phy_off();
+}
diff --git a/drivers/usb/musb/am35x.h b/drivers/usb/musb/am35x.h
new file mode 100644
index 0000000..fac06e7
--- /dev/null
+++ b/drivers/usb/musb/am35x.h
@@ -0,0 +1,94 @@
+/*
+ * am35x.h - TI's AM35x platform specific usb wrapper definitions.
+ *
+ * Author: Ajay Kumar Gupta <ajay.gupta at ti.com>
+ *
+ * Based on drivers/usb/musb/da8xx.h
+ *
+ * Copyright (c) 2010 Texas Instruments Incorporated
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#ifndef __AM35X_USB_H__
+#define __AM35X_USB_H__
+
+#include <asm/arch/cpu.h>
+#include "musb_core.h"
+
+/* Base address of musb wrapper */
+#define AM35X_USB_OTG_BASE 0x5C040000
+
+/* Base address of musb core */
+#define AM35X_USB_OTG_CORE_BASE (AM35X_USB_OTG_BASE + 0x400)
+
+/* Timeout for AM35x usb module */
+#define AM35X_USB_OTG_TIMEOUT 0x3FFFFFF
+
+/*
+ * AM35x platform USB wrapper register overlay.
+ */
+struct am35x_usb_regs {
+ u32 revision;
+ u32 control;
+ u32 status;
+ u32 emulation;
+ u32 reserved0[1];
+ u32 autoreq;
+ u32 srpfixtime;
+ u32 ep_intsrc;
+ u32 ep_intsrcset;
+ u32 ep_intsrcclr;
+ u32 ep_intmsk;
+ u32 ep_intmskset;
+ u32 ep_intmskclr;
+ u32 ep_intsrcmsked;
+ u32 reserved1[1];
+ u32 core_intsrc;
+ u32 core_intsrcset;
+ u32 core_intsrcclr;
+ u32 core_intmsk;
+ u32 core_intmskset;
+ u32 core_intmskclr;
+ u32 core_intsrcmsked;
+ u32 reserved2[1];
+ u32 eoi;
+ u32 mop_sop_en;
+ u32 reserved3[2];
+ u32 txmode;
+ u32 rxmode;
+ u32 epcount_mode;
+};
+
+#define am35x_usb_regs ((struct am35x_usb_regs *)AM35X_USB_OTG_BASE)
+
+/* USB 2.0 PHY Control */
+#define DEVCONF2_PHY_GPIOMODE (1 << 23)
+#define DEVCONF2_OTGMODE (3 << 14)
+#define DEVCONF2_SESENDEN (1 << 13) /* Vsess_end comparator */
+#define DEVCONF2_VBDTCTEN (1 << 12) /* Vbus comparator */
+#define DEVCONF2_REFFREQ_24MHZ (2 << 8)
+#define DEVCONF2_REFFREQ_26MHZ (7 << 8)
+#define DEVCONF2_REFFREQ_13MHZ (6 << 8)
+#define DEVCONF2_REFFREQ (0xf << 8)
+#define DEVCONF2_PHYCKGD (1 << 7)
+#define DEVCONF2_VBUSSENSE (1 << 6)
+#define DEVCONF2_PHY_PLLON (1 << 5) /* override PLL suspend */
+#define DEVCONF2_RESET (1 << 4)
+#define DEVCONF2_PHYPWRDN (1 << 3)
+#define DEVCONF2_OTGPWRDN (1 << 2)
+#define DEVCONF2_DATPOL (1 << 1)
+
+#endif /* __AM35X_USB_H__ */
diff --git a/drivers/usb/musb/musb_udc.c b/drivers/usb/musb/musb_udc.c
index fc43cf4..6f6ed61 100644
--- a/drivers/usb/musb/musb_udc.c
+++ b/drivers/usb/musb/musb_udc.c
@@ -57,6 +57,8 @@
#include "musb_core.h"
#if defined(CONFIG_USB_OMAP3)
#include "omap3.h"
+#elif defined(CONFIG_USB_AM35X)
+#include "am35x.h"
#elif defined(CONFIG_USB_DAVINCI)
#include "davinci.h"
#endif
diff --git a/include/usb.h b/include/usb.h
index bc4ccfe..afd65e3 100644
--- a/include/usb.h
+++ b/include/usb.h
@@ -133,7 +133,7 @@ struct usb_device {
defined(CONFIG_USB_SL811HS) || defined(CONFIG_USB_ISP116X_HCD) || \
defined(CONFIG_USB_R8A66597_HCD) || defined(CONFIG_USB_DAVINCI) || \
defined(CONFIG_USB_OMAP3) || defined(CONFIG_USB_DA8XX) || \
- defined(CONFIG_USB_BLACKFIN)
+ defined(CONFIG_USB_BLACKFIN) || defined(CONFIG_USB_AM35X)
int usb_lowlevel_init(void);
int usb_lowlevel_stop(void);
--
1.6.2.4
More information about the U-Boot
mailing list