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path: root/drivers/usb/musb/da8xx.c
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Diffstat (limited to 'drivers/usb/musb/da8xx.c')
-rw-r--r--drivers/usb/musb/da8xx.c139
1 files changed, 139 insertions, 0 deletions
diff --git a/drivers/usb/musb/da8xx.c b/drivers/usb/musb/da8xx.c
new file mode 100644
index 0000000..40bfe44
--- /dev/null
+++ b/drivers/usb/musb/da8xx.c
@@ -0,0 +1,139 @@
+/*
+ * da8xx.c - TI's DA8xx platform specific usb wrapper functions.
+ *
+ * Author: Ajay Kumar Gupta <ajay.gupta@ti.com>
+ *
+ * Based on drivers/usb/musb/davinci.c
+ *
+ * Copyright (C) 2009 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 "da8xx.h"
+
+/* MUSB platform configuration */
+struct musb_config musb_cfg = {
+ (struct musb_regs *)DA8XX_USB_OTG_CORE_BASE,
+ DA8XX_USB_OTG_TIMEOUT,
+ 0
+};
+
+/*
+ * This function enables VBUS by driving the GPIO Bank4 Pin 15 high.
+ */
+static void enable_vbus(void)
+{
+ u32 value;
+
+ /* configure GPIO bank4 pin 15 in output direction */
+ value = readl(&davinci_gpio_bank45->dir);
+ writel((value & (~DA8XX_USB_VBUS_GPIO)), &davinci_gpio_bank45->dir);
+
+ /* set GPIO bank4 pin 15 high to drive VBUS */
+ value = readl(&davinci_gpio_bank45->set_data);
+ writel((value | DA8XX_USB_VBUS_GPIO), &davinci_gpio_bank45->set_data);
+}
+
+/*
+ * Enable the usb0 phy. This initialization procedure is explained in
+ * the DA8xx USB user guide document.
+ */
+static u8 phy_on(void)
+{
+ u32 timeout;
+ u32 cfgchip2;
+
+ cfgchip2 = readl(&davinci_syscfg_regs->cfgchip2);
+
+ cfgchip2 &= ~(CFGCHIP2_RESET | CFGCHIP2_PHYPWRDN | CFGCHIP2_OTGPWRDN |
+ CFGCHIP2_OTGMODE | CFGCHIP2_REFFREQ);
+ cfgchip2 |= CFGCHIP2_SESENDEN | CFGCHIP2_VBDTCTEN | CFGCHIP2_PHY_PLLON |
+ CFGCHIP2_REFFREQ_24MHZ;
+
+ writel(cfgchip2, &davinci_syscfg_regs->cfgchip2);
+
+ /* wait until the usb phy pll locks */
+ timeout = musb_cfg.timeout;
+ while (timeout--)
+ if (readl(&davinci_syscfg_regs->cfgchip2) & CFGCHIP2_PHYCLKGD)
+ return 1;
+
+ /* USB phy was not turned on */
+ return 0;
+}
+
+/*
+ * Disable the usb phy
+ */
+static void phy_off(void)
+{
+ u32 cfgchip2;
+
+ /*
+ * Power down the on-chip PHY.
+ */
+ cfgchip2 = readl(&davinci_syscfg_regs->cfgchip2);
+ cfgchip2 &= ~CFGCHIP2_PHY_PLLON;
+ cfgchip2 |= CFGCHIP2_PHYPWRDN | CFGCHIP2_OTGPWRDN;
+ writel(cfgchip2, &davinci_syscfg_regs->cfgchip2);
+}
+
+/*
+ * This function performs DA8xx platform specific initialization for usb0.
+ */
+int musb_platform_init(void)
+{
+ u32 revision;
+
+ /* enable psc for usb2.0 */
+ lpsc_on(33);
+
+ /* enable usb vbus */
+ enable_vbus();
+
+ /* reset the controller */
+ writel(0x1, &da8xx_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(&da8xx_usb_regs->revision);
+ if (revision == 0)
+ return -1;
+
+ /* Disable all interrupts */
+ writel((DA8XX_USB_USBINT_MASK | DA8XX_USB_TXINT_MASK |
+ DA8XX_USB_RXINT_MASK), &da8xx_usb_regs->intmsk_set);
+ return 0;
+}
+
+/*
+ * This function performs DA8xx platform specific deinitialization for usb0.
+ */
+void musb_platform_deinit(void)
+{
+ /* Turn of the phy */
+ phy_off();
+
+ /* flush any interrupts */
+ writel((DA8XX_USB_USBINT_MASK | DA8XX_USB_TXINT_MASK |
+ DA8XX_USB_RXINT_MASK), &da8xx_usb_regs->intmsk_clr);
+ writel(0, &da8xx_usb_regs->eoi);
+}