imx: imx9: clock: Add DDR clock support
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>
diff --git a/arch/arm/mach-imx/imx9/clock.c b/arch/arm/mach-imx/imx9/clock.c
index 52d338a..11371f1 100644
--- a/arch/arm/mach-imx/imx9/clock.c
+++ b/arch/arm/mach-imx/imx9/clock.c
@@ -626,6 +626,47 @@
}
}
+#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;