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SPI: mxc_spi: delay initialisation until claim bus
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>
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parent
ba3451d3d8
commit
027a9a0024
1 changed files with 21 additions and 16 deletions
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@ -49,6 +49,8 @@ struct mxc_spi_slave {
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#endif
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int gpio;
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int ss_pol;
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unsigned int max_hz;
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unsigned int mode;
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};
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static inline struct mxc_spi_slave *to_mxc_spi_slave(struct spi_slave *slave)
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@ -83,12 +85,13 @@ u32 get_cspi_div(u32 div)
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}
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#ifdef MXC_CSPI
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static s32 spi_cfg_mxc(struct mxc_spi_slave *mxcs, unsigned int cs,
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unsigned int max_hz, unsigned int mode)
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static s32 spi_cfg_mxc(struct mxc_spi_slave *mxcs, unsigned int cs)
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{
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unsigned int ctrl_reg;
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u32 clk_src;
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u32 div;
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unsigned int max_hz = mxcs->max_hz;
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unsigned int mode = mxcs->mode;
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clk_src = mxc_get_clock(MXC_CSPI_CLK);
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@ -120,19 +123,15 @@ static s32 spi_cfg_mxc(struct mxc_spi_slave *mxcs, unsigned int cs,
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#endif
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#ifdef MXC_ECSPI
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static s32 spi_cfg_mxc(struct mxc_spi_slave *mxcs, unsigned int cs,
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unsigned int max_hz, unsigned int mode)
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static s32 spi_cfg_mxc(struct mxc_spi_slave *mxcs, unsigned int cs)
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{
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u32 clk_src = mxc_get_clock(MXC_CSPI_CLK);
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s32 reg_ctrl, reg_config;
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u32 ss_pol = 0, sclkpol = 0, sclkpha = 0, sclkctl = 0;
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u32 pre_div = 0, post_div = 0;
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struct cspi_regs *regs = (struct cspi_regs *)mxcs->base;
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if (max_hz == 0) {
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printf("Error: desired clock is 0\n");
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return -1;
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}
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unsigned int max_hz = mxcs->max_hz;
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unsigned int mode = mxcs->mode;
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/*
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* Reset SPI and set all CSs to master mode, if toggling
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@ -409,6 +408,11 @@ struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
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if (bus >= ARRAY_SIZE(spi_bases))
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return NULL;
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if (max_hz == 0) {
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printf("Error: desired clock is 0\n");
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return NULL;
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}
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mxcs = spi_alloc_slave(struct mxc_spi_slave, bus, cs);
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if (!mxcs) {
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puts("mxc_spi: SPI Slave not allocated !\n");
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@ -424,13 +428,9 @@ struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
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}
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mxcs->base = spi_bases[bus];
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mxcs->max_hz = max_hz;
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mxcs->mode = mode;
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ret = spi_cfg_mxc(mxcs, cs, max_hz, mode);
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if (ret) {
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printf("mxc_spi: cannot setup SPI controller\n");
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free(mxcs);
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return NULL;
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}
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return &mxcs->slave;
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}
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@ -443,12 +443,17 @@ void spi_free_slave(struct spi_slave *slave)
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int spi_claim_bus(struct spi_slave *slave)
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{
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int ret;
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struct mxc_spi_slave *mxcs = to_mxc_spi_slave(slave);
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struct cspi_regs *regs = (struct cspi_regs *)mxcs->base;
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reg_write(®s->rxdata, 1);
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udelay(1);
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reg_write(®s->ctrl, mxcs->ctrl_reg);
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ret = spi_cfg_mxc(mxcs, slave->cs);
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if (ret) {
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printf("mxc_spi: cannot setup SPI controller\n");
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return ret;
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}
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reg_write(®s->period, MXC_CSPIPERIOD_32KHZ);
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reg_write(®s->intr, 0);
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