diff options
Diffstat (limited to 'common')
| -rw-r--r-- | common/cmd_df.c | 37 | ||||
| -rw-r--r-- | common/cmd_spi.c | 42 | ||||
| -rw-r--r-- | common/soft_spi.c | 124 |
3 files changed, 155 insertions, 48 deletions
diff --git a/common/cmd_df.c b/common/cmd_df.c new file mode 100644 index 000000000..5f650442c --- /dev/null +++ b/common/cmd_df.c @@ -0,0 +1,37 @@ +/* + * Command for accessing DataFlash. + * + * Copyright (C) 2008 Atmel Corporation + */ +#include <common.h> +#include <df.h> + +static int do_df(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]) +{ + const char *cmd; + + /* need at least two arguments */ + if (argc < 2) + goto usage; + + cmd = argv[1]; + + if (strcmp(cmd, "init") == 0) { + df_init(0, 0, 1000000); + return 0; + } + + if (strcmp(cmd, "info") == 0) { + df_show_info(); + return 0; + } + +usage: + printf("Usage:\n%s\n", cmdtp->usage); + return 1; +} + +U_BOOT_CMD( + sf, 2, 1, do_serial_flash, + "sf - Serial flash sub-system\n", + "probe [bus:]cs - init flash device on given SPI bus and CS\n") diff --git a/common/cmd_spi.c b/common/cmd_spi.c index 760442214..40ee7e7dd 100644 --- a/common/cmd_spi.c +++ b/common/cmd_spi.c @@ -37,20 +37,20 @@ # define MAX_SPI_BYTES 32 /* Maximum number of bytes we can handle */ #endif -/* - * External table of chip select functions (see the appropriate board - * support for the actual definition of the table). - */ -extern spi_chipsel_type spi_chipsel[]; -extern int spi_chipsel_cnt; +#ifndef CONFIG_DEFAULT_SPI_BUS +# define CONFIG_DEFAULT_SPI_BUS 0 +#endif +#ifndef CONFIG_DEFAULT_SPI_MODE +# define CONFIG_DEFAULT_SPI_MODE SPI_MODE_0 +#endif /* * Values from last command. */ -static int device; -static int bitlen; -static uchar dout[MAX_SPI_BYTES]; -static uchar din[MAX_SPI_BYTES]; +static unsigned int device; +static int bitlen; +static uchar dout[MAX_SPI_BYTES]; +static uchar din[MAX_SPI_BYTES]; /* * SPI read/write @@ -65,6 +65,7 @@ static uchar din[MAX_SPI_BYTES]; int do_spi (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]) { + struct spi_slave *slave; char *cp = 0; uchar tmp; int j; @@ -101,19 +102,24 @@ int do_spi (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]) } } - if ((device < 0) || (device >= spi_chipsel_cnt)) { - printf("Invalid device %d, giving up.\n", device); - return 1; - } if ((bitlen < 0) || (bitlen > (MAX_SPI_BYTES * 8))) { printf("Invalid bitlen %d, giving up.\n", bitlen); return 1; } - debug ("spi_chipsel[%d] = %08X\n", - device, (uint)spi_chipsel[device]); + /* FIXME: Make these parameters run-time configurable */ + slave = spi_setup_slave(CONFIG_DEFAULT_SPI_BUS, device, 1000000, + CONFIG_DEFAULT_SPI_MODE); + if (!slave) { + printf("Invalid device %d, giving up.\n", device); + return 1; + } + + debug ("spi chipsel = %08X\n", device); - if(spi_xfer(spi_chipsel[device], bitlen, dout, din) != 0) { + spi_claim_bus(slave); + if(spi_xfer(slave, bitlen, dout, din, + SPI_XFER_BEGIN | SPI_XFER_END) != 0) { printf("Error with the SPI transaction.\n"); rcode = 1; } else { @@ -123,6 +129,8 @@ int do_spi (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]) } printf("\n"); } + spi_release_bus(slave); + spi_free_slave(slave); return rcode; } diff --git a/common/soft_spi.c b/common/soft_spi.c index e4250616c..c13165030 100644 --- a/common/soft_spi.c +++ b/common/soft_spi.c @@ -29,6 +29,8 @@ #if defined(CONFIG_SOFT_SPI) +#include <malloc.h> + /*----------------------------------------------------------------------- * Definitions */ @@ -39,6 +41,15 @@ #define PRINTD(fmt,args...) #endif +struct soft_spi_slave { + struct spi_slave slave; + unsigned int mode; +}; + +static inline struct soft_spi_slave *to_soft_spi(struct spi_slave *slave) +{ + return container_of(slave, struct soft_spi_slave, slave); +} /*=====================================================================*/ /* Public Functions */ @@ -56,6 +67,57 @@ void spi_init (void) #endif } +struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs, + unsigned int max_hz, unsigned int mode) +{ + struct soft_spi_slave *ss; + + if (!spi_cs_is_valid(bus, cs)) + return NULL; + + ss = malloc(sizeof(struct soft_spi_slave)); + if (!ss) + return NULL; + + ss->slave.bus = bus; + ss->slave.cs = cs; + ss->mode = mode; + + /* TODO: Use max_hz to limit the SCK rate */ + + return &ss->slave; +} + +void spi_free_slave(struct spi_slave *slave) +{ + struct soft_spi_slave *ss = to_soft_spi(slave); + + free(ss); +} + +int spi_claim_bus(struct spi_slave *slave) +{ +#ifdef CFG_IMMR + volatile immap_t *immr = (immap_t *)CFG_IMMR; +#endif + struct soft_spi_slave *ss = to_soft_spi(slave); + + /* + * Make sure the SPI clock is in idle state as defined for + * this slave. + */ + if (ss->mode & SPI_CPOL) + SPI_SCL(1); + else + SPI_SCL(0); + + return 0; +} + +void spi_release_bus(struct spi_slave *slave) +{ + /* Nothing to do */ +} /*----------------------------------------------------------------------- * SPI transfer @@ -68,50 +130,54 @@ void spi_init (void) * and "din" can point to the same memory location, in which case the * input data overwrites the output data (since both are buffered by * temporary variables, this is OK). - * - * If the chipsel() function is not NULL, it is called with a parameter - * of '1' (chip select active) at the start of the transfer and again with - * a parameter of '0' at the end of the transfer. - * - * If the chipsel() function _is_ NULL, it the responsibility of the - * caller to make the appropriate chip select active before calling - * spi_xfer() and making it inactive after spi_xfer() returns. */ -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) { #ifdef CFG_IMMR volatile immap_t *immr = (immap_t *)CFG_IMMR; #endif - uchar tmpdin = 0; - uchar tmpdout = 0; - int j; + struct soft_spi_slave *ss = to_soft_spi(slave); + uchar tmpdin = 0; + uchar tmpdout = 0; + const u8 *txd = dout; + u8 *rxd = din; + int cpol = ss->mode & SPI_CPOL; + int cpha = ss->mode & SPI_CPHA; + unsigned int j; - PRINTD("spi_xfer: chipsel %08X dout %08X din %08X bitlen %d\n", - (int)chipsel, *(uint *)dout, *(uint *)din, bitlen); + PRINTD("spi_xfer: slave %u:%u dout %08X din %08X bitlen %u\n", + slave->bus, slave->cs, *(uint *)txd, *(uint *)rxd, bitlen); - if(chipsel != NULL) { - (*chipsel)(1); /* select the target chip */ - } + if (flags & SPI_XFER_BEGIN) + spi_cs_activate(slave); for(j = 0; j < bitlen; j++) { /* * Check if it is time to work on a new byte. */ if((j % 8) == 0) { - tmpdout = *dout++; + tmpdout = *txd++; if(j != 0) { - *din++ = tmpdin; + *rxd++ = tmpdin; } tmpdin = 0; } - SPI_SCL(0); + + if (!cpha) + SPI_SCL(!cpol); SPI_SDA(tmpdout & 0x80); SPI_DELAY; - SPI_SCL(1); + if (cpha) + SPI_SCL(!cpol); + else + SPI_SCL(cpol); + tmpdin <<= 1; + tmpdin |= SPI_READ; + tmpdout <<= 1; SPI_DELAY; - tmpdin <<= 1; - tmpdin |= SPI_READ; - tmpdout <<= 1; + if (cpha) + SPI_SCL(cpol); } /* * If the number of bits isn't a multiple of 8, shift the last @@ -120,14 +186,10 @@ int spi_xfer(spi_chipsel_type chipsel, int bitlen, uchar *dout, uchar *din) */ if((bitlen % 8) != 0) tmpdin <<= 8 - (bitlen % 8); - *din++ = tmpdin; - - SPI_SCL(0); /* SPI wants the clock left low for idle */ + *rxd++ = tmpdin; - if(chipsel != NULL) { - (*chipsel)(0); /* deselect the target chip */ - - } + if (flags & SPI_XFER_END) + spi_cs_deactivate(slave); return(0); } |