[U-Boot] [PATCH v2 2/4] ARM: AM43xx: Add functions to enable and disable USB clocks

[Kishon Vijay Abraham I]

Added functions to enable and disable USB clocks which can be invoked
during USB init and USB exit respectively.

Cc: Roger Quadros <rogerq at ti.com>
Cc: Tero Kristo <t-kristo at ti.com>
Cc: Nishanth Menon <nm at ti.com>
Signed-off-by: Kishon Vijay Abraham I <kishon at ti.com>
---
 arch/arm/cpu/armv7/am33xx/clock_am43xx.c     |   70 ++++++++++++++++++++++++++
 arch/arm/include/asm/arch-am33xx/sys_proto.h |    3 ++
 2 files changed, 73 insertions(+)

diff --git a/arch/arm/cpu/armv7/am33xx/clock_am43xx.c b/arch/arm/cpu/armv7/am33xx/clock_am43xx.c
index 35c431e..cad8d46 100644
--- a/arch/arm/cpu/armv7/am33xx/clock_am43xx.c
+++ b/arch/arm/cpu/armv7/am33xx/clock_am43xx.c
@@ -171,3 +171,73 @@ void disable_edma3_clocks(void)
 			  1);
 }
 #endif
+
+#ifdef CONFIG_USB_DWC3
+void enable_usb_clocks(int index)
+{
+	u32 *usbclkctrl = 0;
+	u32 *usbphyocp2scpclkctrl = 0;
+
+	if (index == 0) {
+		usbclkctrl = &cmper->usb0clkctrl;
+		usbphyocp2scpclkctrl = &cmper->usbphyocp2scp0clkctrl;
+		setbits_le32(&cmper->usb0clkctrl,
+			     USBOTGSSX_CLKCTRL_OPTFCLKEN_REFCLK960);
+		setbits_le32(&cmwkup->usbphy0clkctrl,
+			     USBPHY0_CLKCTRL_OPTFCLKEN_CLK32K);
+	} else if (index == 1) {
+		usbclkctrl = &cmper->usb1clkctrl;
+		usbphyocp2scpclkctrl = &cmper->usbphyocp2scp1clkctrl;
+		setbits_le32(&cmper->usb1clkctrl,
+			     USBOTGSSX_CLKCTRL_OPTFCLKEN_REFCLK960);
+		setbits_le32(&cmwkup->usbphy1clkctrl,
+			     USBPHY0_CLKCTRL_OPTFCLKEN_CLK32K);
+	}
+
+	u32 *const clk_domains_usb[] = {
+		0
+	};
+
+	u32 *const clk_modules_explicit_en_usb[] = {
+		usbclkctrl,
+		usbphyocp2scpclkctrl,
+		0
+	};
+
+	do_enable_clocks(clk_domains_usb, clk_modules_explicit_en_usb, 1);
+}
+
+void disable_usb_clocks(int index)
+{
+	u32 *usbclkctrl = 0;
+	u32 *usbphyocp2scpclkctrl = 0;
+
+	if (index == 0) {
+		usbclkctrl = &cmper->usb0clkctrl;
+		usbphyocp2scpclkctrl = &cmper->usbphyocp2scp0clkctrl;
+		clrbits_le32(&cmper->usb0clkctrl,
+			     USBOTGSSX_CLKCTRL_OPTFCLKEN_REFCLK960);
+		clrbits_le32(&cmwkup->usbphy0clkctrl,
+			     USBPHY0_CLKCTRL_OPTFCLKEN_CLK32K);
+	} else if (index == 1) {
+		usbclkctrl = &cmper->usb1clkctrl;
+		usbphyocp2scpclkctrl = &cmper->usbphyocp2scp1clkctrl;
+		clrbits_le32(&cmper->usb1clkctrl,
+			     USBOTGSSX_CLKCTRL_OPTFCLKEN_REFCLK960);
+		clrbits_le32(&cmwkup->usbphy1clkctrl,
+			     USBPHY0_CLKCTRL_OPTFCLKEN_CLK32K);
+	}
+
+	u32 *const clk_domains_usb[] = {
+		0
+	};
+
+	u32 *const clk_modules_disable_usb[] = {
+		usbclkctrl,
+		usbphyocp2scpclkctrl,
+		0
+	};
+
+	do_disable_clocks(clk_domains_usb, clk_modules_disable_usb, 1);
+}
+#endif
diff --git a/arch/arm/include/asm/arch-am33xx/sys_proto.h b/arch/arm/include/asm/arch-am33xx/sys_proto.h
index 91b614a..8f573d2 100644
--- a/arch/arm/include/asm/arch-am33xx/sys_proto.h
+++ b/arch/arm/include/asm/arch-am33xx/sys_proto.h
@@ -42,3 +42,6 @@ void am33xx_spl_board_init(void);
 int am335x_get_efuse_mpu_max_freq(struct ctrl_dev *cdev);
 int am335x_get_tps65910_mpu_vdd(int sil_rev, int frequency);
 #endif
+
+void enable_usb_clocks(int index);
+void disable_usb_clocks(int index);
-- 
1.7.9.5