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-rw-r--r--common/cmd_df.c37
-rw-r--r--common/cmd_spi.c42
-rw-r--r--common/soft_spi.c124
3 files changed, 155 insertions, 48 deletions
diff --git a/common/cmd_df.c b/common/cmd_df.c
new file mode 100644
index 0000000..5f65044
--- /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 7604422..40ee7e7 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 e425061..c131650 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);
}
generated by cgit v1.1 at 2024-11-23 11:20:26 +0000