diff options
author | Dirk Behme <dirk.behme@gmail.com> | 2013-05-09 07:19:52 +0200 |
---|---|---|
committer | Stefano Babic <sbabic@denx.de> | 2013-06-26 16:22:51 +0200 |
commit | 8d4c4ffb95d528f6a709bf68da5e0beb0f4ee72f (patch) | |
tree | b81133a302393e68e7e6426a60050a7fa66ba656 | |
parent | 491f2947a1abf12aa119f9412aa259c0b128f859 (diff) |
spi: mxc_spi: Fix pre and post divider calculation
Fix two issues with the calculation of pre_div and post_div:
1. pre_div: While the calculation of pre_div looks correct, to set the
CONREG[15-12] bits pre_div needs to be decremented by 1:
The i.MX 6Dual/6Quad Applications Processor Reference Manual (IMX6DQRM
Rev. 0, 11/2012) states:
CONREG[15-12]: PRE_DIVIDER
0000 Divide by 1
0001 Divide by 2
0010 Divide by 3
...
1101 Divide by 14
1110 Divide by 15
1111 Divide by 16
I.e. if we want to divide by 2, we have to write 1 to CONREG[15-12].
2. In case the post divider becomes necessary, pre_div will be divided by
16. So set pre_div to 16, too. And not 15.
Both issues above are tested using the following examples:
clk_src = 60000000 (60MHz, default i.MX6 ECSPI clock)
a) max_hz == 23000000 (23MHz, max i.MX6 ECSPI read clock)
-> pre_div = 3 (divide by 3 => CONREG[15-12] == 2)
-> post_div = 0 (divide by 1 => CONREG[11- 8] == 0)
=> 60MHz / 3 = 20MHz SPI clock
b) max_hz == 2000000 (2MHz)
-> pre_div = 16 (divide by 16 => CONREG[15-12] == 15)
-> post_div = 1 (divide by 2 => CONREG[11- 8] == 1)
=> 60MHz / 32 = 1.875MHz SPI clock
c) max_hz == 1000000 (1MHz)
-> pre_div = 16 (divide by 16 => CONREG[15-12] == 15)
-> post_div = 2 (divide by 4 => CONREG[11- 8] == 2)
=> 60MHz / 64 = 937.5kHz SPI clock
d) max_hz == 500000 (500kHz)
-> pre_div = 16 (divide by 16 => CONREG[15-12] == 15)
-> post_div = 3 (divide by 8 => CONREG[11- 8] == 3)
=> 60MHz / 128 = 468.75kHz SPI clock
Signed-off-by: Dirk Behme <dirk.behme@gmail.com>
-rw-r--r-- | drivers/spi/mxc_spi.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/spi/mxc_spi.c b/drivers/spi/mxc_spi.c index 5bed858787..b553a9c596 100644 --- a/drivers/spi/mxc_spi.c +++ b/drivers/spi/mxc_spi.c @@ -128,7 +128,7 @@ 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); - s32 pre_div = 0, post_div = 0, i, reg_ctrl, reg_config; + s32 pre_div = 1, post_div = 0, i, reg_ctrl, reg_config; u32 ss_pol = 0, sclkpol = 0, sclkpha = 0; struct cspi_regs *regs = (struct cspi_regs *)mxcs->base; @@ -154,7 +154,7 @@ static s32 spi_cfg_mxc(struct mxc_spi_slave *mxcs, unsigned int cs, pre_div = DIV_ROUND_UP(clk_src, max_hz); if (pre_div > 16) { post_div = pre_div / 16; - pre_div = 15; + pre_div = 16; } if (post_div != 0) { for (i = 0; i < 16; i++) { @@ -174,7 +174,7 @@ static s32 spi_cfg_mxc(struct mxc_spi_slave *mxcs, unsigned int cs, reg_ctrl = (reg_ctrl & ~MXC_CSPICTRL_SELCHAN(3)) | MXC_CSPICTRL_SELCHAN(cs); reg_ctrl = (reg_ctrl & ~MXC_CSPICTRL_PREDIV(0x0F)) | - MXC_CSPICTRL_PREDIV(pre_div); + MXC_CSPICTRL_PREDIV(pre_div - 1); reg_ctrl = (reg_ctrl & ~MXC_CSPICTRL_POSTDIV(0x0F)) | MXC_CSPICTRL_POSTDIV(post_div); |