diff options
Diffstat (limited to 'drivers/spi')
| -rw-r--r-- | drivers/spi/mpc8xxx_spi.c | 54 | ||||
| -rw-r--r-- | drivers/spi/mxc_spi.c | 88 |
2 files changed, 104 insertions, 38 deletions
diff --git a/drivers/spi/mpc8xxx_spi.c b/drivers/spi/mpc8xxx_spi.c index 2fe838c..136fb50 100644 --- a/drivers/spi/mpc8xxx_spi.c +++ b/drivers/spi/mpc8xxx_spi.c @@ -24,6 +24,7 @@ #include <common.h> #if defined(CONFIG_MPC8XXX_SPI) && defined(CONFIG_HARD_SPI) +#include <malloc.h> #include <spi.h> #include <asm/mpc8xxx_spi.h> @@ -37,6 +38,34 @@ #define SPI_TIMEOUT 1000 +struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs, + unsigned int max_hz, unsigned int mode) +{ + struct spi_slave *slave; + + if (!spi_cs_is_valid(bus, cs)) + return NULL; + + slave = malloc(sizeof(struct spi_slave)); + if (!slave) + return NULL; + + slave->bus = bus; + slave->cs = cs; + + /* + * TODO: Some of the code in spi_init() should probably move + * here, or into spi_claim_bus() below. + */ + + return slave; +} + +void spi_free_slave(struct spi_slave *slave) +{ + free(slave); +} + void spi_init(void) { volatile spi8xxx_t *spi = &((immap_t *) (CFG_IMMR))->spi; @@ -53,7 +82,18 @@ void spi_init(void) spi->com = 0; /* LST bit doesn't do anything, so disregard */ } -int spi_xfer(spi_chipsel_type chipsel, int bitlen, uchar *dout, uchar *din) +int spi_claim_bus(struct spi_slave *slave) +{ + return 0; +} + +void spi_release_bus(struct spi_slave *slave) +{ + +} + +int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout, + void *din, unsigned long flags) { volatile spi8xxx_t *spi = &((immap_t *) (CFG_IMMR))->spi; unsigned int tmpdout, tmpdin, event; @@ -61,11 +101,11 @@ int spi_xfer(spi_chipsel_type chipsel, int bitlen, uchar *dout, uchar *din) int tm, isRead = 0; unsigned char charSize = 32; - debug("spi_xfer: chipsel %08X dout %08X din %08X bitlen %d\n", - (int)chipsel, *(uint *) dout, *(uint *) din, bitlen); + debug("spi_xfer: slave %u:%u dout %08X din %08X bitlen %u\n", + slave->bus, slave->cs, *(uint *) dout, *(uint *) din, bitlen); - if (chipsel != NULL) - (*chipsel) (1); /* select the target chip */ + if (flags & SPI_XFER_BEGIN) + spi_cs_activate(slave); spi->event = 0xffffffff; /* Clear all SPI events */ @@ -135,8 +175,8 @@ int spi_xfer(spi_chipsel_type chipsel, int bitlen, uchar *dout, uchar *din) debug("*** spi_xfer: transfer ended. Value=%08x\n", tmpdin); } - if (chipsel != NULL) - (*chipsel) (0); /* deselect the target chip */ + if (flags & SPI_XFER_END) + spi_cs_deactivate(slave); return 0; } diff --git a/drivers/spi/mxc_spi.c b/drivers/spi/mxc_spi.c index c166ec5..5957ada 100644 --- a/drivers/spi/mxc_spi.c +++ b/drivers/spi/mxc_spi.c @@ -19,6 +19,7 @@ */ #include <common.h> +#include <malloc.h> #include <spi.h> #include <asm/io.h> @@ -61,17 +62,18 @@ static unsigned long spi_bases[] = { 0x53f84000, }; -static unsigned long spi_base; - #endif -spi_chipsel_type spi_chipsel[] = { - (spi_chipsel_type)0, - (spi_chipsel_type)1, - (spi_chipsel_type)2, - (spi_chipsel_type)3, +struct mxc_spi_slave { + struct spi_slave slave; + unsigned long base; + u32 ctrl_reg; }; -int spi_chipsel_cnt = sizeof(spi_chipsel) / sizeof(spi_chipsel[0]); + +static inline struct mxc_spi_slave *to_mxc_spi_slave(struct spi_slave *slave) +{ + return container_of(slave, struct mxc_spi_slave, slave); +} static inline u32 reg_read(unsigned long addr) { @@ -83,30 +85,31 @@ static inline void reg_write(unsigned long addr, u32 val) *(volatile unsigned long*)addr = val; } -static u32 spi_xchg_single(u32 data, int bitlen) +static u32 spi_xchg_single(struct spi_slave *slave, u32 data, int bitlen) { - - unsigned int cfg_reg = reg_read(spi_base + MXC_CSPICTRL); + struct mxc_spi_slave *mxcs = to_mxc_spi_slave(slave); + unsigned int cfg_reg = reg_read(mxcs->base + MXC_CSPICTRL); if (MXC_CSPICTRL_BITCOUNT(bitlen - 1) != (cfg_reg & MXC_CSPICTRL_BITCOUNT(31))) { cfg_reg = (cfg_reg & ~MXC_CSPICTRL_BITCOUNT(31)) | MXC_CSPICTRL_BITCOUNT(bitlen - 1); - reg_write(spi_base + MXC_CSPICTRL, cfg_reg); + reg_write(mxcs->base + MXC_CSPICTRL, cfg_reg); } - reg_write(spi_base + MXC_CSPITXDATA, data); + reg_write(mxcs->base + MXC_CSPITXDATA, data); cfg_reg |= MXC_CSPICTRL_XCH; - reg_write(spi_base + MXC_CSPICTRL, cfg_reg); + reg_write(mxcs->base + MXC_CSPICTRL, cfg_reg); - while (reg_read(spi_base + MXC_CSPICTRL) & MXC_CSPICTRL_XCH) + while (reg_read(mxcs->base + MXC_CSPICTRL) & MXC_CSPICTRL_XCH) ; - return reg_read(spi_base + MXC_CSPIRXDATA); + return reg_read(mxcs->base + MXC_CSPIRXDATA); } -int spi_xfer(spi_chipsel_type chipsel, int bitlen, uchar *dout, uchar *din) +int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout, + void *din, unsigned long flags) { int n_blks = (bitlen + 31) / 32; u32 *out_l, *in_l; @@ -117,13 +120,10 @@ int spi_xfer(spi_chipsel_type chipsel, int bitlen, uchar *dout, uchar *din) return 1; } - if (!spi_base) - spi_select(CONFIG_MXC_SPI_IFACE, (int)chipsel, SPI_MODE_2 | SPI_CS_HIGH); - for (i = 0, in_l = (u32 *)din, out_l = (u32 *)dout; i < n_blks; i++, in_l++, out_l++, bitlen -= 32) - *in_l = spi_xchg_single(*out_l, bitlen); + *in_l = spi_xchg_single(slave, *out_l, bitlen); return 0; } @@ -132,17 +132,17 @@ void spi_init(void) { } -int spi_select(unsigned int bus, unsigned int dev, unsigned long mode) +struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs, + unsigned int max_hz, unsigned int mode) { unsigned int ctrl_reg; + struct mxc_spi_slave *mxcs; if (bus >= sizeof(spi_bases) / sizeof(spi_bases[0]) || - dev > 3) - return 1; - - spi_base = spi_bases[bus]; + cs > 3) + return NULL; - ctrl_reg = MXC_CSPICTRL_CHIPSELECT(dev) | + ctrl_reg = MXC_CSPICTRL_CHIPSELECT(cs) | MXC_CSPICTRL_BITCOUNT(31) | MXC_CSPICTRL_DATARATE(7) | /* FIXME: calculate data rate */ MXC_CSPICTRL_EN | @@ -155,12 +155,38 @@ int spi_select(unsigned int bus, unsigned int dev, unsigned long mode) if (mode & SPI_CS_HIGH) ctrl_reg |= MXC_CSPICTRL_SSPOL; - reg_write(spi_base + MXC_CSPIRESET, 1); + mxcs = malloc(sizeof(struct mxc_spi_slave)); + if (!mxcs) + return NULL; + + mxcs->slave.bus = bus; + mxcs->slave.cs = cs; + mxcs->base = spi_bases[bus]; + mxcs->ctrl_reg = ctrl_reg; + + return &mxcs->slave; +} + +void spi_free_slave(struct spi_slave *slave) +{ + free(slave); +} + +int spi_claim_bus(struct spi_slave *slave) +{ + struct mxc_spi_slave *mxcs = to_mxc_spi_slave(slave); + + reg_write(mxcs->base + MXC_CSPIRESET, 1); udelay(1); - reg_write(spi_base + MXC_CSPICTRL, ctrl_reg); - reg_write(spi_base + MXC_CSPIPERIOD, + reg_write(mxcs->base + MXC_CSPICTRL, mxcs->ctrl_reg); + reg_write(mxcs->base + MXC_CSPIPERIOD, MXC_CSPIPERIOD_32KHZ); - reg_write(spi_base + MXC_CSPIINT, 0); + reg_write(mxcs->base + MXC_CSPIINT, 0); return 0; } + +void spi_release_bus(struct spi_slave *slave) +{ + /* TODO: Shut the controller down */ +} |