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spi is shared between the rtc and tsc2100

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adds the very begining of the rtc driver (only reads the time currently


git-svn-id: svn://svn.rockbox.org/rockbox/trunk@14935 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Jonathan Gordon 2007-10-01 05:27:43 +00:00
parent ea47ee64f0
commit 03f45d3aff
8 changed files with 95 additions and 19 deletions
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50
firmware/target/arm/tms320dm320/spi-dm320.c
View file

@ -24,18 +24,43 @@
* with this program; if not, write to the Free Software Foundation, Inc.,
* 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "kernel.h"
#include "system.h"
#include "spi.h"
#define GIO_TS_ENABLE (1<<2)
#define clr_gio_enable() IO_GIO_BITSET1=GIO_TS_ENABLE
#define set_gio_enable() IO_GIO_BITCLR1=GIO_TS_ENABLE
#define GIO_TS_ENABLE (1<<2)
#define GIO_RTC_ENABLE (1<<12)
int spi_block_transfer(const uint8_t *tx_bytes, unsigned int tx_size,
struct mutex spi_lock;
struct SPI_info {
volatile unsigned short *setreg;
volatile unsigned short *clrreg;
int bit;
};
#define reg(a) (PHY_IO_BASE+a)
struct SPI_info spi_targets[] =
{
[SPI_target_TSC2100] = { reg(0x0594), reg(0x058E), GIO_TS_ENABLE },
[SPI_target_RX5X348AB] = { reg(0x058C), reg(0x0592), GIO_RTC_ENABLE },
};
static void spi_disable_all_targets(void)
{
int i;
for(i=0;i<SPI_MAX_TARGETS;i++)
{
*spi_targets[i].clrreg = spi_targets[i].bit;
}
}
int spi_block_transfer(enum SPI_target target,
const uint8_t *tx_bytes, unsigned int tx_size,
uint8_t *rx_bytes, unsigned int rx_size)
{
spinlock_lock(&spi_lock);
/* Activate the slave select pin */
set_gio_enable();
*spi_targets[target].setreg = spi_targets[target].bit;
while (tx_size--)
{
@ -58,13 +83,15 @@ int spi_block_transfer(const uint8_t *tx_bytes, unsigned int tx_size,
*rx_bytes++ = data & 0xff;
}
clr_gio_enable();
*spi_targets[target].clrreg = spi_targets[target].bit;
spinlock_unlock(&spi_lock);
return 0;
}
void spi_init(void)
{
spinlock_init(&spi_lock);
/* Set SCLK idle level = 0 */
IO_SERIAL0_MODE |= (1<<10);
@ -72,6 +99,9 @@ void spi_init(void)
IO_SERIAL0_TX_ENABLE = 0x0001;
/* Set GIO 18 to output for touch screen slave enable */
IO_GIO_DIR1&=~GIO_TS_ENABLE;
clr_gio_enable();
IO_GIO_DIR1 &= ~GIO_TS_ENABLE;
/* Set GIO 12 to output for rtc slave enable */
IO_GIO_DIR0 &= ~GIO_RTC_ENABLE;
spi_disable_all_targets(); /* make sure only one is ever enabled at a time */
}

10
firmware/target/arm/tms320dm320/spi-target.h
View file

@ -21,9 +21,17 @@
#define SPI_TARGET_H
#include <inttypes.h>
#include <stdbool.h>
enum SPI_target {
SPI_target_TSC2100 = 0,
SPI_target_RX5X348AB,
SPI_MAX_TARGETS,
};
void spi_init(void);
int spi_block_transfer(const uint8_t *tx_bytes, unsigned int tx_size,
int spi_block_transfer(enum SPI_target target,
const uint8_t *tx_bytes, unsigned int tx_size,
uint8_t *rx_bytes, unsigned int rx_size);
#endif