X-Git-Url: https://git.kernelconcepts.de/?p=karo-tx-uboot.git;a=blobdiff_plain;f=drivers%2Fspi%2Fmxc_spi.c;h=5bed858787f610a9c9a46bb2214665a51d60a9e9;hp=698e7266e8167c98f20ee635ba4ebdad68cb5c23;hb=8dc16cf9dd6196d99969d12741df186a61a2f9a3;hpb=61a58a16f85fe51a65ce6f6fdfa7f7fd8e05978a diff --git a/drivers/spi/mxc_spi.c b/drivers/spi/mxc_spi.c index 698e7266e8..5bed858787 100644 --- a/drivers/spi/mxc_spi.c +++ b/drivers/spi/mxc_spi.c @@ -23,7 +23,7 @@ #include #include #include -#include +#include #include #include @@ -33,95 +33,12 @@ #error "i.MX27 CSPI not supported due to drastic differences in register definitions" \ "See linux mxc_spi driver from Freescale for details." - -#elif defined(CONFIG_MX31) - -#define MXC_CSPICTRL_EN (1 << 0) -#define MXC_CSPICTRL_MODE (1 << 1) -#define MXC_CSPICTRL_XCH (1 << 2) -#define MXC_CSPICTRL_SMC (1 << 3) -#define MXC_CSPICTRL_POL (1 << 4) -#define MXC_CSPICTRL_PHA (1 << 5) -#define MXC_CSPICTRL_SSCTL (1 << 6) -#define MXC_CSPICTRL_SSPOL (1 << 7) -#define MXC_CSPICTRL_CHIPSELECT(x) (((x) & 0x3) << 24) -#define MXC_CSPICTRL_BITCOUNT(x) (((x) & 0x1f) << 8) -#define MXC_CSPICTRL_DATARATE(x) (((x) & 0x7) << 16) -#define MXC_CSPICTRL_TC (1 << 8) -#define MXC_CSPICTRL_RXOVF (1 << 6) -#define MXC_CSPICTRL_MAXBITS 0x1f - -#define MXC_CSPIPERIOD_32KHZ (1 << 15) -#define MAX_SPI_BYTES 4 - -static unsigned long spi_bases[] = { - 0x43fa4000, - 0x50010000, - 0x53f84000, -}; - -#define mxc_get_clock(x) mx31_get_ipg_clk() - -#elif defined(CONFIG_MX51) - -#define MXC_CSPICTRL_EN (1 << 0) -#define MXC_CSPICTRL_MODE (1 << 1) -#define MXC_CSPICTRL_XCH (1 << 2) -#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 (1 << 7) -#define MXC_CSPICTRL_RXOVF (1 << 6) - -#define MXC_CSPIPERIOD_32KHZ (1 << 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_POL 4 -#define MXC_CSPICON_PHA 0 -#define MXC_CSPICON_SSPOL 12 - -static unsigned long spi_bases[] = { - CSPI1_BASE_ADDR, - CSPI2_BASE_ADDR, - CSPI3_BASE_ADDR, -}; - -#elif defined(CONFIG_MX35) - -#define MXC_CSPICTRL_EN (1 << 0) -#define MXC_CSPICTRL_MODE (1 << 1) -#define MXC_CSPICTRL_XCH (1 << 2) -#define MXC_CSPICTRL_SMC (1 << 3) -#define MXC_CSPICTRL_POL (1 << 4) -#define MXC_CSPICTRL_PHA (1 << 5) -#define MXC_CSPICTRL_SSCTL (1 << 6) -#define MXC_CSPICTRL_SSPOL (1 << 7) -#define MXC_CSPICTRL_CHIPSELECT(x) (((x) & 0x3) << 12) -#define MXC_CSPICTRL_BITCOUNT(x) (((x) & 0xfff) << 20) -#define MXC_CSPICTRL_DATARATE(x) (((x) & 0x7) << 16) -#define MXC_CSPICTRL_TC (1 << 7) -#define MXC_CSPICTRL_RXOVF (1 << 6) -#define MXC_CSPICTRL_MAXBITS 0xfff - -#define MXC_CSPIPERIOD_32KHZ (1 << 15) -#define MAX_SPI_BYTES 4 +#endif static unsigned long spi_bases[] = { - 0x43fa4000, - 0x50010000, + MXC_SPI_BASE_ADDRESSES }; -#else -#error "Unsupported architecture" -#endif - #define OUT MXC_GPIO_DIRECTION_OUT #define reg_read readl @@ -131,7 +48,7 @@ struct mxc_spi_slave { struct spi_slave slave; unsigned long base; u32 ctrl_reg; -#if defined(CONFIG_MX51) +#if defined(MXC_ECSPI) u32 cfg_reg; #endif int gpio; @@ -147,14 +64,14 @@ void spi_cs_activate(struct spi_slave *slave) { struct mxc_spi_slave *mxcs = to_mxc_spi_slave(slave); if (mxcs->gpio > 0) - mxc_gpio_set(mxcs->gpio, mxcs->ss_pol); + gpio_set_value(mxcs->gpio, mxcs->ss_pol); } void spi_cs_deactivate(struct spi_slave *slave) { struct mxc_spi_slave *mxcs = to_mxc_spi_slave(slave); if (mxcs->gpio > 0) - mxc_gpio_set(mxcs->gpio, + gpio_set_value(mxcs->gpio, !(mxcs->ss_pol)); } @@ -169,7 +86,7 @@ u32 get_cspi_div(u32 div) return i; } -#if defined(CONFIG_MX31) || defined(CONFIG_MX35) +#ifdef MXC_CSPI static s32 spi_cfg_mxc(struct mxc_spi_slave *mxcs, unsigned int cs, unsigned int max_hz, unsigned int mode) { @@ -179,7 +96,7 @@ static s32 spi_cfg_mxc(struct mxc_spi_slave *mxcs, unsigned int cs, clk_src = mxc_get_clock(MXC_CSPI_CLK); - div = clk_src / max_hz; + div = DIV_ROUND_UP(clk_src, max_hz); div = get_cspi_div(div); debug("clk %d Hz, div %d, real clk %d Hz\n", @@ -206,7 +123,7 @@ static s32 spi_cfg_mxc(struct mxc_spi_slave *mxcs, unsigned int cs, } #endif -#if defined(CONFIG_MX51) +#ifdef MXC_ECSPI static s32 spi_cfg_mxc(struct mxc_spi_slave *mxcs, unsigned int cs, unsigned int max_hz, unsigned int mode) { @@ -220,17 +137,21 @@ static s32 spi_cfg_mxc(struct mxc_spi_slave *mxcs, unsigned int cs, return -1; } - reg_ctrl = reg_read(®s->ctrl); - - /* Reset spi */ - reg_write(®s->ctrl, 0); - reg_write(®s->ctrl, (reg_ctrl | 0x1)); + /* + * Reset SPI and set all CSs to master mode, if toggling + * between slave and master mode we might see a glitch + * on the clock line + */ + reg_ctrl = MXC_CSPICTRL_MODE_MASK; + reg_write(®s->ctrl, reg_ctrl); + reg_ctrl |= MXC_CSPICTRL_EN; + reg_write(®s->ctrl, reg_ctrl); /* * The following computation is taken directly from Freescale's code. */ if (clk_src > max_hz) { - pre_div = clk_src / max_hz; + pre_div = DIV_ROUND_UP(clk_src, max_hz); if (pre_div > 16) { post_div = pre_div / 16; pre_div = 15; @@ -257,9 +178,6 @@ static s32 spi_cfg_mxc(struct mxc_spi_slave *mxcs, unsigned int cs, reg_ctrl = (reg_ctrl & ~MXC_CSPICTRL_POSTDIV(0x0F)) | MXC_CSPICTRL_POSTDIV(post_div); - /* always set to master mode */ - reg_ctrl |= 1 << (cs + 4); - /* We need to disable SPI before changing registers */ reg_ctrl &= ~MXC_CSPICTRL_EN; @@ -318,7 +236,7 @@ int spi_xchg_single(struct spi_slave *slave, unsigned int bitlen, MXC_CSPICTRL_BITCOUNT(bitlen - 1); reg_write(®s->ctrl, mxcs->ctrl_reg | MXC_CSPICTRL_EN); -#ifdef CONFIG_MX51 +#ifdef MXC_ECSPI reg_write(®s->cfg, mxcs->cfg_reg); #endif @@ -470,7 +388,7 @@ static int decode_cs(struct mxc_spi_slave *mxcs, unsigned int cs) if (cs > 3) { mxcs->gpio = cs >> 8; cs &= 3; - ret = mxc_gpio_direction(mxcs->gpio, OUT); + ret = gpio_direction_output(mxcs->gpio, !(mxcs->ss_pol)); if (ret) { printf("mxc_spi: cannot setup gpio %d\n", mxcs->gpio); return -EINVAL; @@ -491,12 +409,14 @@ struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs, if (bus >= ARRAY_SIZE(spi_bases)) return NULL; - mxcs = malloc(sizeof(struct mxc_spi_slave)); + mxcs = spi_alloc_slave(struct mxc_spi_slave, bus, cs); if (!mxcs) { puts("mxc_spi: SPI Slave not allocated !\n"); return NULL; } + mxcs->ss_pol = (mode & SPI_CS_HIGH) ? 1 : 0; + ret = decode_cs(mxcs, cs); if (ret < 0) { free(mxcs); @@ -505,10 +425,7 @@ struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs, cs = ret; - mxcs->slave.bus = bus; - mxcs->slave.cs = cs; mxcs->base = spi_bases[bus]; - mxcs->ss_pol = (mode & SPI_CS_HIGH) ? 1 : 0; ret = spi_cfg_mxc(mxcs, cs, max_hz, mode); if (ret) {