add enable_spi_clk(), so board code can enable spi clocks.
Signed-off-by: Heiko Schocher hs@denx.de Reviewed-by: Jagannadha Sutradharudu Teki jaganna@xilinx.com Cc: Eric Nelson eric.nelson@boundarydevices.com Cc: Stefano Babic sbabic@denx.de
--- - changes for v2: - add comment from Stefano Babic: - add comment for spi_num range - add SPI_MAX_NUM in imx-regs.h - changes for v3: - add Reviewed-by from Jagannadha Sutradharudu Teki - changes for v4: none
arch/arm/cpu/armv7/mx6/clock.c | 18 ++++++++++++++++++ arch/arm/include/asm/arch-mx6/clock.h | 1 + arch/arm/include/asm/arch-mx6/imx-regs.h | 1 + 3 files changed, 20 insertions(+)
diff --git a/arch/arm/cpu/armv7/mx6/clock.c b/arch/arm/cpu/armv7/mx6/clock.c index 7dd83ec..e60cd46 100644 --- a/arch/arm/cpu/armv7/mx6/clock.c +++ b/arch/arm/cpu/armv7/mx6/clock.c @@ -71,6 +71,24 @@ int enable_i2c_clk(unsigned char enable, unsigned i2c_num) } #endif
+/* spi_num can be from 0 - SPI_MAX_NUM */ +int enable_spi_clk(unsigned char enable, unsigned spi_num) +{ + u32 reg; + u32 mask; + + if (spi_num > SPI_MAX_NUM) + return -EINVAL; + + mask = MXC_CCM_CCGR_CG_MASK << (spi_num << 1); + reg = __raw_readl(&imx_ccm->CCGR1); + if (enable) + reg |= mask; + else + reg &= ~mask; + __raw_writel(reg, &imx_ccm->CCGR1); + return 0; +} static u32 decode_pll(enum pll_clocks pll, u32 infreq) { u32 div; diff --git a/arch/arm/include/asm/arch-mx6/clock.h b/arch/arm/include/asm/arch-mx6/clock.h index 1b4ded7..339c789 100644 --- a/arch/arm/include/asm/arch-mx6/clock.h +++ b/arch/arm/include/asm/arch-mx6/clock.h @@ -57,6 +57,7 @@ void enable_usboh3_clk(unsigned char enable); int enable_sata_clock(void); int enable_pcie_clock(void); int enable_i2c_clk(unsigned char enable, unsigned i2c_num); +int enable_spi_clk(unsigned char enable, unsigned spi_num); void enable_ipu_clock(void); int enable_fec_anatop_clock(enum enet_freq freq); #endif /* __ASM_ARCH_CLOCK_H */ diff --git a/arch/arm/include/asm/arch-mx6/imx-regs.h b/arch/arm/include/asm/arch-mx6/imx-regs.h index 2135051..aa5bc92 100644 --- a/arch/arm/include/asm/arch-mx6/imx-regs.h +++ b/arch/arm/include/asm/arch-mx6/imx-regs.h @@ -405,6 +405,7 @@ struct cspi_regs { #define MXC_CSPICTRL_RXOVF (1 << 6) #define MXC_CSPIPERIOD_32KHZ (1 << 15) #define MAX_SPI_BYTES 32 +#define SPI_MAX_NUM 4
/* Bit position inside CTRL register to be associated with SS */ #define MXC_CSPICTRL_CHAN 18