95167e0177
changes. git-svn-id: svn://svn.rockbox.org/rockbox/trunk@17241 a1c6a512-1295-4272-9138-f99709370657
117 lines
3.6 KiB
C
117 lines
3.6 KiB
C
/*
|
|
* SPI interface driver for the DM320 SoC
|
|
*
|
|
* Copyright (C) 2007 shirour <mrobefan@gmail.com>
|
|
* Copyright (C) 2007 Catalin Patulea <cat@vv.carleton.ca>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License as published by the
|
|
* Free Software Foundation; either version 2 of the License, or (at your
|
|
* option) any later version.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
|
|
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
|
|
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
|
|
* NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
|
|
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
|
|
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along
|
|
* 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 GIO_RTC_ENABLE (1<<12)
|
|
#define GIO_BL_ENABLE (1<<13)
|
|
#define GIO_LCD_ENABLE (1<<5)
|
|
|
|
struct mutex spi_mtx;
|
|
|
|
struct SPI_info {
|
|
volatile unsigned short *setreg;
|
|
volatile unsigned short *clrreg;
|
|
int bit;
|
|
};
|
|
|
|
struct SPI_info spi_targets[] =
|
|
{
|
|
#ifndef CREATIVE_ZVM
|
|
[SPI_target_TSC2100] = { &IO_GIO_BITCLR1, &IO_GIO_BITSET1, GIO_TS_ENABLE },
|
|
[SPI_target_RX5X348AB] = { &IO_GIO_BITSET0, &IO_GIO_BITCLR0, GIO_RTC_ENABLE},
|
|
[SPI_target_BACKLIGHT] = { &IO_GIO_BITCLR1, &IO_GIO_BITSET1, GIO_BL_ENABLE },
|
|
#else
|
|
[SPI_target_LTV250QV] = { &IO_GIO_BITCLR2, &IO_GIO_BITSET2, GIO_LCD_ENABLE},
|
|
#endif
|
|
};
|
|
|
|
#define IO_SERIAL0_XMIT (0x100)
|
|
#define IO_SERIAL0_MODE_SCLK (1 << 10)
|
|
|
|
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)
|
|
{
|
|
mutex_lock(&spi_mtx);
|
|
/* Activate the slave select pin */
|
|
*spi_targets[target].setreg = spi_targets[target].bit;
|
|
|
|
while (tx_size--)
|
|
{
|
|
/* Send one byte */
|
|
IO_SERIAL0_TX_DATA = *tx_bytes++;
|
|
|
|
/* Wait until transfer finished */
|
|
while (IO_SERIAL0_RX_DATA & IO_SERIAL0_XMIT);
|
|
}
|
|
|
|
while (rx_size--)
|
|
{
|
|
/* Make the clock tick */
|
|
IO_SERIAL0_TX_DATA = 0;
|
|
|
|
/* Wait until transfer finished */
|
|
unsigned short data;
|
|
while ((data = IO_SERIAL0_RX_DATA) & IO_SERIAL0_XMIT);
|
|
|
|
*rx_bytes++ = data & 0xff;
|
|
}
|
|
|
|
*spi_targets[target].clrreg = spi_targets[target].bit;
|
|
|
|
mutex_unlock(&spi_mtx);
|
|
return 0;
|
|
}
|
|
|
|
void spi_init(void)
|
|
{
|
|
mutex_init(&spi_mtx);
|
|
/* Set SCLK idle level = 0 */
|
|
IO_SERIAL0_MODE |= IO_SERIAL0_MODE_SCLK;
|
|
/* Enable TX */
|
|
IO_SERIAL0_TX_ENABLE = 0x0001;
|
|
#ifndef CREATIVE_ZVM
|
|
/* Set GIO 18 to output for touch screen slave enable */
|
|
IO_GIO_DIR1 &= ~GIO_TS_ENABLE;
|
|
/* Set GIO 12 to output for rtc slave enable */
|
|
IO_GIO_DIR0 &= ~GIO_RTC_ENABLE;
|
|
#endif
|
|
spi_disable_all_targets(); /* make sure only one is ever enabled at a time */
|
|
|
|
}
|