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imx233: fix potential hbus dividor settings + doc

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HBUS uses the same field for integer and fractional dividers, the
choice is made by a bit. Make sure both are changed together,
otherwise this could result in the wrong divider to be used and in
HBUS freq to be too low or too high (very bad).

Change-Id: I253d8eeee26c5038868b729c4f791511295a39f0
This commit is contained in:
Amaury Pouly 2012-12-26 01:06:04 +01:00
parent 423755d1bd
commit ca83b558df
2 changed files with 10 additions and 4 deletions
Download patch file Download diff file Expand all files Collapse all files

9
firmware/target/arm/imx233/clkctrl-imx233.c
View file

@ -103,7 +103,9 @@ void imx233_clkctrl_set_clock_divisor(enum imx233_clock_t clk, int div)
__FIELD_SET(HW_CLKCTRL_EMI, DIV_EMI, div);
break;
case CLK_HBUS:
__FIELD_SET(HW_CLKCTRL_HBUS, DIV, div);
/* disable frac enable at the same time */
HW_CLKCTRL_HBUS = div << HW_CLKCTRL_HBUS__DIV_BP |
(HW_CLKCTRL_HBUS & ~(HW_CLKCTRL_HBUS__DIV_FRAC_EN | HW_CLKCTRL_HBUS__DIV_BM));
break;
case CLK_XBUS:
__FIELD_SET(HW_CLKCTRL_XBUS, DIV, div);
@ -137,8 +139,9 @@ void imx233_clkctrl_set_fractional_divisor(enum imx233_clock_t clk, int fracdiv)
switch(clk)
{
case CLK_HBUS:
__FIELD_SET(HW_CLKCTRL_HBUS, DIV, fracdiv);
__REG_SET(HW_CLKCTRL_HBUS) = HW_CLKCTRL_HBUS__DIV_FRAC_EN;
/* set frac enable at the same time */
HW_CLKCTRL_HBUS = fracdiv << HW_CLKCTRL_HBUS__DIV_BP | HW_CLKCTRL_HBUS__DIV_FRAC_EN |
(HW_CLKCTRL_HBUS & ~HW_CLKCTRL_HBUS__DIV_BM);
return;
case CLK_PIX: REG = &HW_CLKCTRL_FRAC_PIX; break;
case CLK_IO: REG = &HW_CLKCTRL_FRAC_IO; break;

5
firmware/target/arm/imx233/clkctrl-imx233.h
View file

@ -124,7 +124,7 @@ enum imx233_clock_t
CLK_HBUS, /* freq, div, frac */
CLK_PLL, /* freq, enable */
CLK_XTAL, /* freq */
CLK_EMI, /* freq, div, frac, bypass (NOTE: don't modify directly EMI) */
CLK_EMI, /* freq, div, frac, bypass */
CLK_XBUS, /* freq, div */
};
@ -139,6 +139,7 @@ enum imx233_xtal_clk_t
/* Auto-Slow monitoring */
enum imx233_as_monitor_t
{
AS_NONE = 0, /* Do not monitor any activity */
AS_CPU_INSTR = 1 << 21, /* Monitor CPU instruction access to AHB */
AS_CPU_DATA = 1 << 22, /* Monitor CPU data access to AHB */
AS_TRAFFIC = 1 << 23, /* Monitor AHB master activity */
@ -147,6 +148,7 @@ enum imx233_as_monitor_t
AS_APBHDMA = 1 << 26, /* Monitor APBH DMA activity */
AS_PXP = 1 << 27, /* Monitor PXP activity */
AS_DCP = 1 << 28, /* Monitor DCP activity */
AS_ALL = 0xff << 21, /* Monitor all activity */
};
enum imx233_as_div_t
@ -183,6 +185,7 @@ void imx233_clkctrl_set_auto_slow_divisor(enum imx233_as_div_t div);
enum imx233_as_div_t imx233_clkctrl_get_auto_slow_divisor(void);
void imx233_clkctrl_enable_auto_slow(bool enable);
bool imx233_clkctrl_is_auto_slow_enabled(void);
/* can use a mask of clocks */
void imx233_clkctrl_enable_auto_slow_monitor(enum imx233_as_monitor_t monitor, bool enable);
bool imx233_clkctrl_is_auto_slow_monitor_enabled(enum imx233_as_monitor_t monitor);