ARM: OMAP5: Add functions to enable and disable USB clocks

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

Cc: Roger Quadros <rogerq@ti.com>
Cc: Tero Kristo <t-kristo@ti.com>
Cc: Nishanth Menon <nm@ti.com>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>

2 files changed, 101 insertions, 0 deletions

diff --git a/arch/arm/cpu/armv7/omap5/hw_data.c b/arch/arm/cpu/armv7/omap5/hw_data.c
index e0ee23f3d1..bec6539ef5 100644
--- a/arch/arm/cpu/armv7/omap5/hw_data.c
+++ b/arch/arm/cpu/armv7/omap5/hw_data.c
@@ -622,6 +622,103 @@ void disable_edma3_clocks(void)
 }
 #endif
 
+#ifdef CONFIG_USB_DWC3
+void enable_usb_clocks(int index)
+{
+	u32 cm_l3init_usb_otg_ss_clkctrl = 0;
+
+	if (index == 0) {
+		cm_l3init_usb_otg_ss_clkctrl =
+			(*prcm)->cm_l3init_usb_otg_ss1_clkctrl;
+		/* Enable 960 MHz clock for dwc3 */
+		setbits_le32((*prcm)->cm_l3init_usb_otg_ss1_clkctrl,
+			     OPTFCLKEN_REFCLK960M);
+
+		/* Enable 32 KHz clock for dwc3 */
+		setbits_le32((*prcm)->cm_coreaon_usb_phy1_core_clkctrl,
+			     USBPHY_CORE_CLKCTRL_OPTFCLKEN_CLK32K);
+	} else if (index == 1) {
+		cm_l3init_usb_otg_ss_clkctrl =
+			(*prcm)->cm_l3init_usb_otg_ss2_clkctrl;
+		/* Enable 960 MHz clock for dwc3 */
+		setbits_le32((*prcm)->cm_l3init_usb_otg_ss2_clkctrl,
+			     OPTFCLKEN_REFCLK960M);
+
+		/* Enable 32 KHz clock for dwc3 */
+		setbits_le32((*prcm)->cm_coreaon_usb_phy2_core_clkctrl,
+			     USBPHY_CORE_CLKCTRL_OPTFCLKEN_CLK32K);
+
+		/* Enable 60 MHz clock for USB2PHY2 */
+		setbits_le32((*prcm)->cm_coreaon_l3init_60m_gfclk_clkctrl,
+			     L3INIT_CLKCTRL_OPTFCLKEN_60M_GFCLK);
+	}
+
+	u32 const clk_domains_usb[] = {
+		0
+	};
+
+	u32 const clk_modules_hw_auto_usb[] = {
+		(*prcm)->cm_l3init_ocp2scp1_clkctrl,
+		cm_l3init_usb_otg_ss_clkctrl,
+		0
+	};
+
+	u32 const clk_modules_explicit_en_usb[] = {
+		0
+	};
+
+	do_enable_clocks(clk_domains_usb,
+			 clk_modules_hw_auto_usb,
+			 clk_modules_explicit_en_usb,
+			 1);
+}
+
+void disable_usb_clocks(int index)
+{
+	u32 cm_l3init_usb_otg_ss_clkctrl = 0;
+
+	if (index == 0) {
+		cm_l3init_usb_otg_ss_clkctrl =
+			(*prcm)->cm_l3init_usb_otg_ss1_clkctrl;
+		/* Disable 960 MHz clock for dwc3 */
+		clrbits_le32((*prcm)->cm_l3init_usb_otg_ss1_clkctrl,
+			     OPTFCLKEN_REFCLK960M);
+
+		/* Disable 32 KHz clock for dwc3 */
+		clrbits_le32((*prcm)->cm_coreaon_usb_phy1_core_clkctrl,
+			     USBPHY_CORE_CLKCTRL_OPTFCLKEN_CLK32K);
+	} else if (index == 1) {
+		cm_l3init_usb_otg_ss_clkctrl =
+			(*prcm)->cm_l3init_usb_otg_ss2_clkctrl;
+		/* Disable 960 MHz clock for dwc3 */
+		clrbits_le32((*prcm)->cm_l3init_usb_otg_ss2_clkctrl,
+			     OPTFCLKEN_REFCLK960M);
+
+		/* Disable 32 KHz clock for dwc3 */
+		clrbits_le32((*prcm)->cm_coreaon_usb_phy2_core_clkctrl,
+			     USBPHY_CORE_CLKCTRL_OPTFCLKEN_CLK32K);
+
+		/* Disable 60 MHz clock for USB2PHY2 */
+		clrbits_le32((*prcm)->cm_coreaon_l3init_60m_gfclk_clkctrl,
+			     L3INIT_CLKCTRL_OPTFCLKEN_60M_GFCLK);
+	}
+
+	u32 const clk_domains_usb[] = {
+		0
+	};
+
+	u32 const clk_modules_disable[] = {
+		(*prcm)->cm_l3init_ocp2scp1_clkctrl,
+		cm_l3init_usb_otg_ss_clkctrl,
+		0
+	};
+
+	do_disable_clocks(clk_domains_usb,
+			  clk_modules_disable,
+			  1);
+}
+#endif
+
 const struct ctrl_ioregs ioregs_omap5430 = {
 	.ctrl_ddrch = DDR_IO_I_34OHM_SR_FASTEST_WD_DQ_NO_PULL_DQS_PULL_DOWN,
 	.ctrl_lpddr2ch = DDR_IO_I_34OHM_SR_FASTEST_WD_CK_CKE_NCS_CA_PULL_DOWN,
diff --git a/arch/arm/include/asm/omap_common.h b/arch/arm/include/asm/omap_common.h
index 37117e2827..81f1616ec0 100644
--- a/arch/arm/include/asm/omap_common.h
+++ b/arch/arm/include/asm/omap_common.h
@@ -592,6 +592,10 @@ u32 omap_ddr_clk(void);
 u32 get_sys_clk_index(void);
 void enable_basic_clocks(void);
 void enable_basic_uboot_clocks(void);
+
+void enable_usb_clocks(int index);
+void disable_usb_clocks(int index);
+
 void scale_vcores(struct vcores_data const *);
 u32 get_offset_code(u32 volt_offset, struct pmic_data *pmic);
 void do_scale_vcore(u32 vcore_reg, u32 volt_mv, struct pmic_data *pmic);