mips: ath79: Add support for ungating USB on ar933x and ar934x

Add code to ungate the USB controller on ar933x and ar934x .

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
Cc: Wills Wang <wills.wang@live.com>

arch/mips/mach-ath79/include/mach/ath79.h

@@ -140,4 +140,6 @@ static inline int soc_is_qca956x(void)
 	return soc_is_tp9343() || soc_is_qca9561();
 }
 
+int ath79_usb_reset(void);
+
 #endif /* __ASM_MACH_ATH79_H */

arch/mips/mach-ath79/reset.c

@@ -5,6 +5,7 @@
  */
 
 #include <common.h>
+#include <asm/errno.h>
 #include <asm/io.h>
 #include <asm/addrspace.h>
 #include <asm/types.h>
@@ -69,3 +70,61 @@ u32 get_bootstrap(void)
 
 	return 0;
 }
+
+static int usb_reset_ar933x(void __iomem *reset_regs)
+{
+	/* Ungate the USB block */
+	setbits_be32(reset_regs + AR933X_RESET_REG_RESET_MODULE,
+		     AR933X_RESET_USBSUS_OVERRIDE);
+	mdelay(1);
+	clrbits_be32(reset_regs + AR933X_RESET_REG_RESET_MODULE,
+		     AR933X_RESET_USB_HOST);
+	mdelay(1);
+	clrbits_be32(reset_regs + AR933X_RESET_REG_RESET_MODULE,
+		     AR933X_RESET_USB_PHY);
+	mdelay(1);
+
+	return 0;
+}
+
+static int usb_reset_ar934x(void __iomem *reset_regs)
+{
+	/* Ungate the USB block */
+	setbits_be32(reset_regs + AR934X_RESET_REG_RESET_MODULE,
+		     AR934X_RESET_USBSUS_OVERRIDE);
+	mdelay(1);
+	clrbits_be32(reset_regs + AR934X_RESET_REG_RESET_MODULE,
+		     AR934X_RESET_USB_PHY);
+	mdelay(1);
+	clrbits_be32(reset_regs + AR934X_RESET_REG_RESET_MODULE,
+		     AR934X_RESET_USB_PHY_ANALOG);
+	mdelay(1);
+	clrbits_be32(reset_regs + AR934X_RESET_REG_RESET_MODULE,
+		     AR934X_RESET_USB_HOST);
+	mdelay(1);
+
+	return 0;
+}
+
+int ath79_usb_reset(void)
+{
+	void __iomem *usbc_regs = map_physmem(AR71XX_USB_CTRL_BASE,
+					      AR71XX_USB_CTRL_SIZE,
+					      MAP_NOCACHE);
+	void __iomem *reset_regs = map_physmem(AR71XX_RESET_BASE,
+					       AR71XX_RESET_SIZE,
+					       MAP_NOCACHE);
+	/*
+	 * Turn on the Buff and Desc swap bits.
+	 * NOTE: This write into an undocumented register in mandatory to
+	 *       get the USB controller operational in BigEndian mode.
+	 */
+	writel(0xf0000, usbc_regs + AR71XX_USB_CTRL_REG_CONFIG);
+
+	if (soc_is_ar933x())
+		return usb_reset_ar933x(reset_regs);
+	if (soc_is_ar934x())
+		return usb_reset_ar934x(reset_regs);
+
+	return -EINVAL;
+}