From: Jacky Bai ping.bai@nxp.com
Update the ddr init flow to support LPDDR3 and PLL bypass mode.
Reviewed-by: Ye Li ye.li@nxp.com Signed-off-by: Jacky Bai ping.bai@nxp.com Signed-off-by: Peng Fan peng.fan@nxp.com --- drivers/ddr/imx/imx8ulp/ddr_init.c | 55 +++++++++++++++++++++++------- 1 file changed, 43 insertions(+), 12 deletions(-)
diff --git a/drivers/ddr/imx/imx8ulp/ddr_init.c b/drivers/ddr/imx/imx8ulp/ddr_init.c index a5a9fd8d7c8..3f04f533825 100644 --- a/drivers/ddr/imx/imx8ulp/ddr_init.c +++ b/drivers/ddr/imx/imx8ulp/ddr_init.c @@ -31,6 +31,7 @@ #define DENALI_CTL_25 (DDR_CTL_BASE_ADDR + 4 * 25)
#define DENALI_PHY_1624 (DDR_PHY_BASE_ADDR + 4 * 1624) +#define DENALI_PHY_1625 (DDR_PHY_BASE_ADDR + 4 * 1625) #define DENALI_PHY_1537 (DDR_PHY_BASE_ADDR + 4 * 1537) #define PHY_FREQ_SEL_MULTICAST_EN(X) ((X) << 8) #define PHY_FREQ_SEL_INDEX(X) ((X) << 16) @@ -82,25 +83,39 @@ int ddr_calibration(unsigned int fsp_table[3]) u32 int_status_init, phy_freq_req, phy_freq_type; u32 lock_0, lock_1, lock_2; u32 freq_chg_pt, freq_chg_cnt; + u32 is_lpddr4 = 0;
if (IS_ENABLED(CONFIG_IMX8ULP_DRAM_PHY_PLL_BYPASS)) { ddr_enable_pll_bypass(); freq_chg_cnt = 0; freq_chg_pt = 0; } else { - reg_val = readl(DENALI_CTL_250); - if (((reg_val >> 16) & 0x3) == 1) - freq_chg_cnt = 2; - else - freq_chg_cnt = 3; - - reg_val = readl(DENALI_PI_12); - if (reg_val == 0x3) { - freq_chg_pt = 1; - } else if (reg_val == 0x7) { - freq_chg_pt = 2; + reg_val = (readl(DENALI_CTL_00) >> 8) & 0xf; + if (reg_val == 0x7) { + /* LPDDR3 type */ + set_ddr_clk(fsp_table[1] >> 1); + freq_chg_cnt = 0; + freq_chg_pt = 0; + } else if (reg_val == 0xb) { + /* LPDDR4/4x type */ + is_lpddr4 = 1; + reg_val = readl(DENALI_CTL_250); + if (((reg_val >> 16) & 0x3) == 1) + freq_chg_cnt = 2; + else + freq_chg_cnt = 3; + + reg_val = readl(DENALI_PI_12); + if (reg_val == 0x3) { + freq_chg_pt = 1; + } else if (reg_val == 0x7) { + freq_chg_pt = 2; + } else { + printf("frequency map(0x%x) is wrong, please check!\r\n", reg_val); + return -1; + } } else { - printf("frequency map(0x%x) is wrong, please check!\r\n", reg_val); + printf("Incorrect DDR type configured!\r\n"); return -1; } } @@ -179,6 +194,22 @@ int ddr_calibration(unsigned int fsp_table[3]) }
debug("De-Skew PLL is locked and ready\n"); + + /* Change LPDDR4 FREQ1 to bypass mode if it is lower than 200MHz */ + if (is_lpddr4 && fsp_table[1] < 400) { + /* Set FREQ1 to bypass mode */ + reg_val = PHY_FREQ_SEL_MULTICAST_EN(0) | PHY_FREQ_SEL_INDEX(0); + writel(reg_val, DENALI_PHY_1537); + + /* PHY_PLL_BYPASS=0x1 (DENALI_PHY_1624) */ + reg_val = readl(DENALI_PHY_1624) | 0x1; + writel(reg_val, DENALI_PHY_1624); + + /* DENALI_PHY_1625: bypass mode in PHY PLL */ + reg_val = readl(DENALI_PHY_1625) & ~0xf; + writel(reg_val, DENALI_PHY_1625); + } + return 0; }