diff options
Diffstat (limited to 'drivers/spi/mxc_spi.c')
| -rw-r--r-- | drivers/spi/mxc_spi.c | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/drivers/spi/mxc_spi.c b/drivers/spi/mxc_spi.c index c5ffad80fb6..553a0315df5 100644 --- a/drivers/spi/mxc_spi.c +++ b/drivers/spi/mxc_spi.c @@ -4,6 +4,7 @@ */ #include <common.h> +#include <clk.h> #include <dm.h> #include <log.h> #include <malloc.h> @@ -20,6 +21,82 @@ DECLARE_GLOBAL_DATA_PTR; +/* MX35 and older is CSPI */ +#if defined(CONFIG_MX25) || defined(CONFIG_MX31) || defined(CONFIG_MX35) +#define MXC_CSPI +struct cspi_regs { + u32 rxdata; + u32 txdata; + u32 ctrl; + u32 intr; + u32 dma; + u32 stat; + u32 period; + u32 test; +}; + +#define MXC_CSPICTRL_EN BIT(0) +#define MXC_CSPICTRL_MODE BIT(1) +#define MXC_CSPICTRL_XCH BIT(2) +#define MXC_CSPICTRL_SMC BIT(3) +#define MXC_CSPICTRL_POL BIT(4) +#define MXC_CSPICTRL_PHA BIT(5) +#define MXC_CSPICTRL_SSCTL BIT(6) +#define MXC_CSPICTRL_SSPOL BIT(7) +#define MXC_CSPICTRL_DATARATE(x) (((x) & 0x7) << 16) +#define MXC_CSPICTRL_RXOVF BIT(6) +#define MXC_CSPIPERIOD_32KHZ BIT(15) +#define MAX_SPI_BYTES 4 +#if defined(CONFIG_MX25) || defined(CONFIG_MX35) +#define MXC_CSPICTRL_CHIPSELECT(x) (((x) & 0x3) << 12) +#define MXC_CSPICTRL_BITCOUNT(x) (((x) & 0xfff) << 20) +#define MXC_CSPICTRL_TC BIT(7) +#define MXC_CSPICTRL_MAXBITS 0xfff +#else /* MX31 */ +#define MXC_CSPICTRL_CHIPSELECT(x) (((x) & 0x3) << 24) +#define MXC_CSPICTRL_BITCOUNT(x) (((x) & 0x1f) << 8) +#define MXC_CSPICTRL_TC BIT(8) +#define MXC_CSPICTRL_MAXBITS 0x1f +#endif + +#else /* MX51 and newer is ECSPI */ +#define MXC_ECSPI +struct cspi_regs { + u32 rxdata; + u32 txdata; + u32 ctrl; + u32 cfg; + u32 intr; + u32 dma; + u32 stat; + u32 period; +}; + +#define MXC_CSPICTRL_EN BIT(0) +#define MXC_CSPICTRL_MODE BIT(1) +#define MXC_CSPICTRL_XCH BIT(2) +#define MXC_CSPICTRL_MODE_MASK (0xf << 4) +#define MXC_CSPICTRL_CHIPSELECT(x) (((x) & 0x3) << 12) +#define MXC_CSPICTRL_BITCOUNT(x) (((x) & 0xfff) << 20) +#define MXC_CSPICTRL_PREDIV(x) (((x) & 0xF) << 12) +#define MXC_CSPICTRL_POSTDIV(x) (((x) & 0xF) << 8) +#define MXC_CSPICTRL_SELCHAN(x) (((x) & 0x3) << 18) +#define MXC_CSPICTRL_MAXBITS 0xfff +#define MXC_CSPICTRL_TC BIT(7) +#define MXC_CSPICTRL_RXOVF BIT(6) +#define MXC_CSPIPERIOD_32KHZ BIT(15) +#define MAX_SPI_BYTES 32 + +/* Bit position inside CTRL register to be associated with SS */ +#define MXC_CSPICTRL_CHAN 18 + +/* Bit position inside CON register to be associated with SS */ +#define MXC_CSPICON_PHA 0 /* SCLK phase control */ +#define MXC_CSPICON_POL 4 /* SCLK polarity */ +#define MXC_CSPICON_SSPOL 12 /* SS polarity */ +#define MXC_CSPICON_CTL 20 /* inactive state of SCLK */ +#endif + #ifdef CONFIG_MX27 /* i.MX27 has a completely wrong register layout and register definitions in the * datasheet, the correct one is in the Freescale's Linux driver */ @@ -541,8 +618,19 @@ static int mxc_spi_probe(struct udevice *bus) if (mxcs->base == FDT_ADDR_T_NONE) return -ENODEV; +#if CONFIG_IS_ENABLED(CLK) + struct clk clk; + ret = clk_get_by_index(bus, 0, &clk); + if (ret) + return ret; + + clk_enable(&clk); + + mxcs->max_hz = clk_get_rate(&clk); +#else mxcs->max_hz = fdtdec_get_int(blob, node, "spi-max-frequency", 20000000); +#endif return 0; } |