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imx: imx9: clock: Add DDR clock support

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Implement the DDR driver clock interfaces for set DDR rate and
bypass DDR PLL

Signed-off-by: Ye Li <ye.li@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
This commit is contained in:
Ye Li 2022-07-26 16:41:06 +08:00 committed by Stefano Babic
parent 87650716ea
commit e631185a20
2 changed files with 44 additions and 0 deletions
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3
arch/arm/include/asm/arch-imx9/clock.h
View file

@ -213,6 +213,9 @@ void init_clk_usdhc(u32 index);
int enable_i2c_clk(unsigned char enable, u32 i2c_num);
u32 imx_get_i2cclk(u32 i2c_num);
u32 mxc_get_clock(enum mxc_clock clk);
void dram_pll_init(ulong pll_val);
void dram_enable_bypass(ulong clk_val);
void dram_disable_bypass(void);
int ccm_clk_src_on(enum ccm_clk_src oscpll, bool enable);
int ccm_clk_src_auto(enum ccm_clk_src oscpll, bool enable);

41
arch/arm/mach-imx/imx9/clock.c
View file

@ -626,6 +626,47 @@ void enable_usboh3_clk(unsigned char enable)
}
}
#ifdef CONFIG_SPL_BUILD
void dram_pll_init(ulong pll_val)
{
configure_fracpll(DRAM_PLL_CLK, pll_val);
}
void dram_enable_bypass(ulong clk_val)
{
switch (clk_val) {
case MHZ(400):
ccm_clk_root_cfg(DRAM_ALT_CLK_ROOT, SYS_PLL_PFD1, 2);
break;
case MHZ(333):
ccm_clk_root_cfg(DRAM_ALT_CLK_ROOT, SYS_PLL_PFD0, 3);
break;
case MHZ(200):
ccm_clk_root_cfg(DRAM_ALT_CLK_ROOT, SYS_PLL_PFD1, 4);
break;
case MHZ(100):
ccm_clk_root_cfg(DRAM_ALT_CLK_ROOT, SYS_PLL_PFD1, 8);
break;
default:
printf("No matched freq table %lu\n", clk_val);
return;
}
/* Set DRAM APB to 133Mhz */
ccm_clk_root_cfg(DRAM_APB_CLK_ROOT, SYS_PLL_PFD1_DIV2, 3);
/* Switch from DRAM clock root from PLL to CCM */
ccm_shared_gpr_set(SHARED_GPR_DRAM_CLK, SHARED_GPR_DRAM_CLK_SEL_CCM);
}
void dram_disable_bypass(void)
{
/* Set DRAM APB to 133Mhz */
ccm_clk_root_cfg(DRAM_APB_CLK_ROOT, SYS_PLL_PFD1_DIV2, 3);
/* Switch from DRAM clock root from CCM to PLL */
ccm_shared_gpr_set(SHARED_GPR_DRAM_CLK, SHARED_GPR_DRAM_CLK_SEL_PLL);
}
#endif
int clock_init(void)
{
int i;