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/*
* 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)
static struct mutex spi_mtx;
struct SPI_info {
volatile unsigned short *setreg;
volatile unsigned short *clrreg;
int bit;
bool idle_low;
char divider;
};
static struct SPI_info spi_targets[] =
{
#ifndef CREATIVE_ZVx
[SPI_target_TSC2100] = { &IO_GIO_BITCLR1, &IO_GIO_BITSET1,
GIO_TS_ENABLE, true, 0x07},
/* RTC seems to have timing problems if the CLK idles low */
[SPI_target_RX5X348AB] = { &IO_GIO_BITSET0, &IO_GIO_BITCLR0,
GIO_RTC_ENABLE, false, 0x3F},
/* This appears to work properly idleing low, idling high is very glitchy */
[SPI_target_BACKLIGHT] = { &IO_GIO_BITCLR1, &IO_GIO_BITSET1,
GIO_BL_ENABLE, true, 0x07},
#else
[SPI_target_LTV250QV] = { &IO_GIO_BITCLR2, &IO_GIO_BITSET2,
GIO_LCD_ENABLE, true, 0x07},
#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);
IO_SERIAL0_MODE &= ~(1<<10);
IO_SERIAL0_MODE |= (spi_targets[target].idle_low << 10);
IO_SERIAL0_MODE &= ~(0xFF);
IO_SERIAL0_MODE |= spi_targets[target].divider;
/* Activate the slave select pin */
if(tx_size) {
IO_SERIAL0_TX_ENABLE = 0x0001;
*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);
IO_SERIAL0_MODE = 0x2200 | 0x3F;
/* Enable TX */
IO_SERIAL0_TX_ENABLE = 0x0001;
#ifndef CREATIVE_ZVx
/* Setup SPI Chip Select Pins:
* 12 - RTC
* 18 - Touchscreen
* 29 - Backlight
*/
/* 12: output, non-inverted, no-irq, falling edge, no-chat, normal */
dm320_set_io(12, false, false, false, false, false, 0x00);
/* 18: output, non-inverted, no-irq, falling edge, no-chat, normal */
dm320_set_io(18, false, false, false, false, false, 0x00);
/* 29: output, non-inverted, no-irq, falling edge, no-chat, normal */
dm320_set_io(29, false, false, false, false, false, 0x00);
#endif
/* make sure only one is ever enabled at a time */
spi_disable_all_targets();
}
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