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SPI: mxc_spi: delay initialisation until claim bus

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it is not correct to init for a specific slave in spi_setup_slave.
instead buffer the values and delay init until spi_claim_bus.

Signed-off-by: Markus Niebel <Markus.Niebel@tq-group.com>
Acked-by: Stefano Babic <sbabic@denx.de>
Reviewed-by: Jagannadha Sutradharudu Teki <jagannadh.teki@gmail.com>
This commit is contained in:
Markus Niebel 2014-10-23 16:09:39 +02:00 committed by Jagannadha Sutradharudu Teki
parent ba3451d3d8
commit 027a9a0024
1 changed files with 21 additions and 16 deletions
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37
drivers/spi/mxc_spi.c
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@ -49,6 +49,8 @@ struct mxc_spi_slave {
#endif
int gpio;
int ss_pol;
unsigned int max_hz;
unsigned int mode;
};
static inline struct mxc_spi_slave *to_mxc_spi_slave(struct spi_slave *slave)
@ -83,12 +85,13 @@ u32 get_cspi_div(u32 div)
}
#ifdef MXC_CSPI
static s32 spi_cfg_mxc(struct mxc_spi_slave *mxcs, unsigned int cs,
unsigned int max_hz, unsigned int mode)
static s32 spi_cfg_mxc(struct mxc_spi_slave *mxcs, unsigned int cs)
{
unsigned int ctrl_reg;
u32 clk_src;
u32 div;
unsigned int max_hz = mxcs->max_hz;
unsigned int mode = mxcs->mode;
clk_src = mxc_get_clock(MXC_CSPI_CLK);
@ -120,19 +123,15 @@ static s32 spi_cfg_mxc(struct mxc_spi_slave *mxcs, unsigned int cs,
#endif
#ifdef MXC_ECSPI
static s32 spi_cfg_mxc(struct mxc_spi_slave *mxcs, unsigned int cs,
unsigned int max_hz, unsigned int mode)
static s32 spi_cfg_mxc(struct mxc_spi_slave *mxcs, unsigned int cs)
{
u32 clk_src = mxc_get_clock(MXC_CSPI_CLK);
s32 reg_ctrl, reg_config;
u32 ss_pol = 0, sclkpol = 0, sclkpha = 0, sclkctl = 0;
u32 pre_div = 0, post_div = 0;
struct cspi_regs *regs = (struct cspi_regs *)mxcs->base;
if (max_hz == 0) {
printf("Error: desired clock is 0\n");
return -1;
}
unsigned int max_hz = mxcs->max_hz;
unsigned int mode = mxcs->mode;
/*
* Reset SPI and set all CSs to master mode, if toggling
@ -409,6 +408,11 @@ struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
if (bus >= ARRAY_SIZE(spi_bases))
return NULL;
if (max_hz == 0) {
printf("Error: desired clock is 0\n");
return NULL;
}
mxcs = spi_alloc_slave(struct mxc_spi_slave, bus, cs);
if (!mxcs) {
puts("mxc_spi: SPI Slave not allocated !\n");
@ -424,13 +428,9 @@ struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
}
mxcs->base = spi_bases[bus];
mxcs->max_hz = max_hz;
mxcs->mode = mode;
ret = spi_cfg_mxc(mxcs, cs, max_hz, mode);
if (ret) {
printf("mxc_spi: cannot setup SPI controller\n");
free(mxcs);
return NULL;
}
return &mxcs->slave;
}
@ -443,12 +443,17 @@ void spi_free_slave(struct spi_slave *slave)
int spi_claim_bus(struct spi_slave *slave)
{
int ret;
struct mxc_spi_slave *mxcs = to_mxc_spi_slave(slave);
struct cspi_regs *regs = (struct cspi_regs *)mxcs->base;
reg_write(&regs->rxdata, 1);
udelay(1);
reg_write(&regs->ctrl, mxcs->ctrl_reg);
ret = spi_cfg_mxc(mxcs, slave->cs);
if (ret) {
printf("mxc_spi: cannot setup SPI controller\n");
return ret;
}
reg_write(&regs->period, MXC_CSPIPERIOD_32KHZ);
reg_write(&regs->intr, 0);