[U-Boot] [PATCH V2 2/9] mx6: add clock enabling functions

[Nikita Kiryanov]

Add functions to enable/disable clocks for UART, SPI, ENET, and MMC.

Cc: Stefano Babic <sbabic at denx.de>
Signed-off-by: Nikita Kiryanov <nikita at compulab.co.il>
---
Changes in V2:
	- No changes.

 arch/arm/cpu/armv7/mx6/clock.c        | 99 +++++++++++++++++++++++++++++++++++
 arch/arm/include/asm/arch-mx6/clock.h |  5 ++
 2 files changed, 104 insertions(+)

diff --git a/arch/arm/cpu/armv7/mx6/clock.c b/arch/arm/cpu/armv7/mx6/clock.c
index 7dd83ec..696dc98 100644
--- a/arch/arm/cpu/armv7/mx6/clock.c
+++ b/arch/arm/cpu/armv7/mx6/clock.c
@@ -36,6 +36,35 @@ void enable_ocotp_clk(unsigned char enable)
 }
 #endif
 
+#ifdef CONFIG_NAND_MXS
+void setup_gpmi_io_clk(u32 cfg)
+{
+	/* Disable clocks per ERR007177 from MX6 errata */
+	clrbits_le32(&imx_ccm->CCGR4,
+		     MXC_CCM_CCGR4_RAWNAND_U_BCH_INPUT_APB_MASK |
+		     MXC_CCM_CCGR4_RAWNAND_U_GPMI_BCH_INPUT_BCH_MASK |
+		     MXC_CCM_CCGR4_RAWNAND_U_GPMI_BCH_INPUT_GPMI_IO_MASK |
+		     MXC_CCM_CCGR4_RAWNAND_U_GPMI_INPUT_APB_MASK |
+		     MXC_CCM_CCGR4_PL301_MX6QPER1_BCH_MASK);
+
+	clrbits_le32(&imx_ccm->CCGR2, MXC_CCM_CCGR2_IOMUX_IPT_CLK_IO_MASK);
+
+	clrsetbits_le32(&imx_ccm->cs2cdr,
+			MXC_CCM_CS2CDR_ENFC_CLK_PODF_MASK |
+			MXC_CCM_CS2CDR_ENFC_CLK_PRED_MASK |
+			MXC_CCM_CS2CDR_ENFC_CLK_SEL_MASK,
+			cfg);
+
+	setbits_le32(&imx_ccm->CCGR2, MXC_CCM_CCGR2_IOMUX_IPT_CLK_IO_MASK);
+	setbits_le32(&imx_ccm->CCGR4,
+		     MXC_CCM_CCGR4_RAWNAND_U_BCH_INPUT_APB_MASK |
+		     MXC_CCM_CCGR4_RAWNAND_U_GPMI_BCH_INPUT_BCH_MASK |
+		     MXC_CCM_CCGR4_RAWNAND_U_GPMI_BCH_INPUT_GPMI_IO_MASK |
+		     MXC_CCM_CCGR4_RAWNAND_U_GPMI_INPUT_APB_MASK |
+		     MXC_CCM_CCGR4_PL301_MX6QPER1_BCH_MASK);
+}
+#endif
+
 void enable_usboh3_clk(unsigned char enable)
 {
 	u32 reg;
@@ -49,6 +78,76 @@ void enable_usboh3_clk(unsigned char enable)
 
 }
 
+#ifdef CONFIG_FEC_MXC
+void enable_enet_clk(unsigned char enable)
+{
+	u32 reg;
+
+	reg = __raw_readl(&imx_ccm->CCGR1);
+	if (enable)
+		reg |= MXC_CCM_CCGR1_ENET_CLK_ENABLE_MASK;
+	else
+		reg &= ~(MXC_CCM_CCGR1_ENET_CLK_ENABLE_MASK);
+	__raw_writel(reg, &imx_ccm->CCGR1);
+}
+#endif
+
+#ifdef CONFIG_MXC_UART
+void enable_uart_clk(unsigned char enable)
+{
+	u32 reg, mask;
+
+	reg = __raw_readl(&imx_ccm->CCGR5);
+	mask = MXC_CCM_CCGR5_UART_MASK | MXC_CCM_CCGR5_UART_SERIAL_MASK;
+	if (enable)
+		reg |= mask;
+	else
+		reg &= ~mask;
+	__raw_writel(reg, &imx_ccm->CCGR5);
+}
+#endif
+
+#ifdef CONFIG_SPI
+/* spi_num can be from 0 - 4 */
+int enable_cspi_clock(unsigned char enable, unsigned spi_num)
+{
+	u32 reg, mask;
+
+	if (spi_num > 4)
+		return -EINVAL;
+
+	mask = MXC_CCM_CCGR_CG_MASK << (spi_num * 2);
+	reg = readl(&imx_ccm->CCGR1);
+	if (enable)
+		reg |= mask;
+	else
+		reg &= ~mask;
+
+	__raw_writel(reg, &imx_ccm->CCGR1);
+	return 0;
+}
+#endif
+
+#ifdef CONFIG_MMC
+int enable_usdhc_clk(unsigned char enable, unsigned bus_num)
+{
+	u32 reg, mask;
+
+	if (bus_num > 3)
+		return -EINVAL;
+
+	mask = MXC_CCM_CCGR_CG_MASK << (bus_num * 2 + 2);
+	reg = readl(&imx_ccm->CCGR6);
+	if (enable)
+		reg |= mask;
+	else
+		reg &= ~mask;
+
+	__raw_writel(reg, &imx_ccm->CCGR6);
+	return 0;
+}
+#endif
+
 #ifdef CONFIG_SYS_I2C_MXC
 /* i2c_num can be from 0 - 2 */
 int enable_i2c_clk(unsigned char enable, unsigned i2c_num)
diff --git a/arch/arm/include/asm/arch-mx6/clock.h b/arch/arm/include/asm/arch-mx6/clock.h
index 1b4ded7..f0b728b 100644
--- a/arch/arm/include/asm/arch-mx6/clock.h
+++ b/arch/arm/include/asm/arch-mx6/clock.h
@@ -52,11 +52,16 @@ enum enet_freq {
 u32 imx_get_uartclk(void);
 u32 imx_get_fecclk(void);
 unsigned int mxc_get_clock(enum mxc_clock clk);
+void setup_gpmi_io_clk(u32 cfg);
 void enable_ocotp_clk(unsigned char enable);
 void enable_usboh3_clk(unsigned char enable);
+void enable_uart_clk(unsigned char enable);
+int enable_cspi_clock(unsigned char enable, unsigned spi_num);
+int enable_usdhc_clk(unsigned char enable, unsigned bus_num);
 int enable_sata_clock(void);
 int enable_pcie_clock(void);
 int enable_i2c_clk(unsigned char enable, unsigned i2c_num);
 void enable_ipu_clock(void);
 int enable_fec_anatop_clock(enum enet_freq freq);
+void enable_enet_clk(unsigned char enable);
 #endif /* __ASM_ARCH_CLOCK_H */
-- 
1.9.1