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SPI: mxc_spi: add support for i.MX35 processor 

Signed-off-by: Stefano Babic <sbabic@denx.de>
This commit is contained in:
Stefano Babic 2011-01-19 22:46:30 +00:00 committed by Albert Aribaud
parent 01bb24b642
commit c9d59c7fbe
1 changed files with 72 additions and 24 deletions
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96
drivers/spi/mxc_spi.c
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@ -70,6 +70,8 @@ static unsigned long spi_bases[] = {
0x53f84000,
};
#define mxc_get_clock(x) mx31_get_ipg_clk()
#elif defined(CONFIG_MX51)
#include <asm/arch/imx-regs.h>
#include <asm/arch/clock.h>
@ -111,6 +113,45 @@ static unsigned long spi_bases[] = {
CSPI2_BASE_ADDR,
CSPI3_BASE_ADDR,
};
#elif defined(CONFIG_MX35)
#include <asm/arch/imx-regs.h>
#include <asm/arch/clock.h>
#define MXC_CSPIRXDATA 0x00
#define MXC_CSPITXDATA 0x04
#define MXC_CSPICTRL 0x08
#define MXC_CSPIINT 0x0C
#define MXC_CSPIDMA 0x10
#define MXC_CSPISTAT 0x14
#define MXC_CSPIPERIOD 0x18
#define MXC_CSPITEST 0x1C
#define MXC_CSPIRESET 0x00
#define MXC_CSPICTRL_EN (1 << 0)
#define MXC_CSPICTRL_MODE (1 << 1)
#define MXC_CSPICTRL_XCH (1 << 2)
#define MXC_CSPICTRL_SMC (1 << 3)
#define MXC_CSPICTRL_POL (1 << 4)
#define MXC_CSPICTRL_PHA (1 << 5)
#define MXC_CSPICTRL_SSCTL (1 << 6)
#define MXC_CSPICTRL_SSPOL (1 << 7)
#define MXC_CSPICTRL_CHIPSELECT(x) (((x) & 0x3) << 12)
#define MXC_CSPICTRL_BITCOUNT(x) (((x) & 0xfff) << 20)
#define MXC_CSPICTRL_DATARATE(x) (((x) & 0x7) << 16)
#define MXC_CSPICTRL_TC (1 << 7)
#define MXC_CSPICTRL_RXOVF (1 << 6)
#define MXC_CSPICTRL_MAXBITS 0xfff
#define MXC_CSPIPERIOD_32KHZ (1 << 15)
#define MAX_SPI_BYTES 4
static unsigned long spi_bases[] = {
0x43fa4000,
0x50010000,
};
#else
#error "Unsupported architecture"
#endif
@ -158,8 +199,35 @@ void spi_cs_deactivate(struct spi_slave *slave)
!(mxcs->ss_pol));
}
#ifdef CONFIG_MX51
static s32 spi_cfg(struct mxc_spi_slave *mxcs, unsigned int cs,
#if defined(CONFIG_MX31) || defined(CONFIG_MX35)
static s32 spi_cfg_mxc(struct mxc_spi_slave *mxcs, unsigned int cs,
unsigned int max_hz, unsigned int mode)
{
unsigned int ctrl_reg;
ctrl_reg = MXC_CSPICTRL_CHIPSELECT(cs) |
MXC_CSPICTRL_BITCOUNT(MXC_CSPICTRL_MAXBITS) |
MXC_CSPICTRL_DATARATE(7) | /* FIXME: calculate data rate */
MXC_CSPICTRL_EN |
#ifdef CONFIG_MX35
MXC_CSPICTRL_SSCTL |
#endif
MXC_CSPICTRL_MODE;
if (mode & SPI_CPHA)
ctrl_reg |= MXC_CSPICTRL_PHA;
if (mode & SPI_CPOL)
ctrl_reg |= MXC_CSPICTRL_POL;
if (mode & SPI_CS_HIGH)
ctrl_reg |= MXC_CSPICTRL_SSPOL;
mxcs->ctrl_reg = ctrl_reg;
return 0;
}
#endif
#if defined(CONFIG_MX51)
static s32 spi_cfg_mxc(struct mxc_spi_slave *mxcs, unsigned int cs,
unsigned int max_hz, unsigned int mode)
{
u32 clk_src = mxc_get_clock(MXC_CSPI_CLK);
@ -227,7 +295,7 @@ static s32 spi_cfg(struct mxc_spi_slave *mxcs, unsigned int cs,
/*
* Configuration register setup
* The MX51 has support different setup for each SS
* The MX51 supports different setup for each SS
*/
reg_config = (reg_config & ~(1 << (cs + MXC_CSPICON_SSPOL))) |
(ss_pol << (cs + MXC_CSPICON_SSPOL));
@ -363,7 +431,6 @@ int spi_xchg_single(struct spi_slave *slave, unsigned int bitlen,
}
int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout,
void *din, unsigned long flags)
{
@ -441,7 +508,6 @@ static int decode_cs(struct mxc_spi_slave *mxcs, unsigned int cs)
struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
unsigned int max_hz, unsigned int mode)
{
unsigned int ctrl_reg;
struct mxc_spi_slave *mxcs;
int ret;
@ -467,30 +533,12 @@ struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
mxcs->base = spi_bases[bus];
mxcs->ss_pol = (mode & SPI_CS_HIGH) ? 1 : 0;
#ifdef CONFIG_MX51
/* Can be used for i.MX31 too ? */
ctrl_reg = 0;
ret = spi_cfg(mxcs, cs, max_hz, mode);
ret = spi_cfg_mxc(mxcs, cs, max_hz, mode);
if (ret) {
printf("mxc_spi: cannot setup SPI controller\n");
free(mxcs);
return NULL;
}
#else
ctrl_reg = MXC_CSPICTRL_CHIPSELECT(cs) |
MXC_CSPICTRL_BITCOUNT(31) |
MXC_CSPICTRL_DATARATE(7) | /* FIXME: calculate data rate */
MXC_CSPICTRL_EN |
MXC_CSPICTRL_MODE;
if (mode & SPI_CPHA)
ctrl_reg |= MXC_CSPICTRL_PHA;
if (mode & SPI_CPOL)
ctrl_reg |= MXC_CSPICTRL_POL;
if (mode & SPI_CS_HIGH)
ctrl_reg |= MXC_CSPICTRL_SSPOL;
mxcs->ctrl_reg = ctrl_reg;
#endif
return &mxcs->slave;
}