Banana-pi M3 has LPDDR3 DRAM. this adds support for LPDDR3 for A83T. Mostly the timing parameters are different from DDR3.
Signed-off-by: Vishnu Patekar vishnupatekar0510@gmail.com --- arch/arm/cpu/armv7/sunxi/dram_sun8i_a83t.c | 56 ++++++++++++++++++----- arch/arm/include/asm/arch-sunxi/dram_sun8i_a83t.h | 5 ++ 2 files changed, 50 insertions(+), 11 deletions(-)
diff --git a/arch/arm/cpu/armv7/sunxi/dram_sun8i_a83t.c b/arch/arm/cpu/armv7/sunxi/dram_sun8i_a83t.c index cac7f43..9c229bf 100644 --- a/arch/arm/cpu/armv7/sunxi/dram_sun8i_a83t.c +++ b/arch/arm/cpu/armv7/sunxi/dram_sun8i_a83t.c @@ -131,10 +131,42 @@ static void auto_set_timing_para(struct dram_para *para) /* Set work mode register */ mctl_set_cr(para); /* Set mode register */ - writel(MCTL_MR0, &mctl_ctl->mr0); - writel(MCTL_MR1, &mctl_ctl->mr1); - writel(MCTL_MR2, &mctl_ctl->mr2); - writel(MCTL_MR3, &mctl_ctl->mr3); + if (para->dram_type == DRAM_TYPE_DDR3) { + writel(MCTL_MR0, &mctl_ctl->mr0); + writel(MCTL_MR1, &mctl_ctl->mr1); + writel(MCTL_MR2, &mctl_ctl->mr2); + writel(MCTL_MR3, &mctl_ctl->mr3); + } else if (para->dram_type == DRAM_TYPE_LPDDR3) { + writel(MCTL_LPDDR3_MR0, &mctl_ctl->mr0); + writel(MCTL_LPDDR3_MR1, &mctl_ctl->mr1); + writel(MCTL_LPDDR3_MR2, &mctl_ctl->mr2); + writel(MCTL_LPDDR3_MR3, &mctl_ctl->mr3); + + /* timing parameters for LPDDR3 */ + tfaw = max(ns_to_t(50), 4); + trrd = max(ns_to_t(10), 2); + trcd = max(ns_to_t(24), 2); + trc = ns_to_t(70); + txp = max(ns_to_t(8), 2); + twtr = max(ns_to_t(8), 2); + trtp = max(ns_to_t(8), 2); + trp = max(ns_to_t(27), 2); + tras = ns_to_t(42); + trefi = ns_to_t(3900) / 32; + trfc = ns_to_t(210); + tmrw = 5; + tmrd = 5; + tckesr = 5; + tcwl = 3; /* CWL 8 */ + t_rdata_en = 5; + tdinit0 = (200 * CONFIG_DRAM_CLK) + 1; /* 200us */ + tdinit1 = (100 * CONFIG_DRAM_CLK) / 1000 + 1; /* 100ns */ + tdinit2 = (11 * CONFIG_DRAM_CLK) + 1; /* 200us */ + tdinit3 = (1 * CONFIG_DRAM_CLK) + 1; /* 1us */ + twtp = tcwl + 4 + twr + 1; /* CWL + BL/2 + tWR */ + twr2rd = tcwl + 4 + 1 + twtr; /* WL + BL / 2 + tWTR */ + trd2wr = tcl + 4 + 5 - tcwl + 1; /* RL + BL / 2 + 2 - WL */ + } /* Set dram timing */ reg_val = (twtp << 24) | (tfaw << 16) | (trasmax << 8) | (tras << 0); writel(reg_val, &mctl_ctl->dramtmg0); @@ -232,7 +264,6 @@ static int mctl_channel_init(struct dram_para *para) u32 low_data_lines_status; /* Training status of datalines 0 - 7 */ u32 high_data_lines_status; /* Training status of datalines 8 - 15 */ u32 i, rval; - auto_set_timing_para(para);
/* Set dram master access priority */ @@ -289,6 +320,10 @@ static int mctl_channel_init(struct dram_para *para) clrbits_le32(&mctl_ctl->pgcr2, (0x3 << 6)); clrbits_le32(&mctl_ctl->dqsgmr, (0x1 << 8) | (0x7));
+ if (para->dram_type == DRAM_TYPE_LPDDR3) + clrsetbits_le32(&mctl_ctl->dxccr, (0x1 << 27) | (0x3<<6) , + 0x1 << 31); + if (readl(&mctl_com->cr) & 0x1) writel(0x00000303, &mctl_ctl->odtmap); else @@ -299,7 +334,10 @@ static int mctl_channel_init(struct dram_para *para) clrsetbits_le32(ZQnPR(0), 0x000000ff, CONFIG_DRAM_ZQ & 0xff); clrsetbits_le32(ZQnPR(1), 0x000000ff, (CONFIG_DRAM_ZQ >> 8) & 0xff); /* CA calibration */ - mctl_set_pir(0x0201f3 | 0x1<<10); + if (para->dram_type == DRAM_TYPE_DDR3) + mctl_set_pir(0x0201f3 | 0x1<<10); + else + mctl_set_pir(0x020173 | 0x1<<10);
/* DQS gate training */ if (mctl_train_dram(para) != 0) { @@ -359,6 +397,7 @@ static void mctl_sys_init(struct dram_para *para) clrbits_le32(&ccm->ahb_gate0, 1 << AHB_GATE_OFFSET_MCTL); clrbits_le32(&ccm->ahb_reset0_cfg, 1 << AHB_RESET_OFFSET_MCTL); clrbits_le32(&ccm->pll5_cfg, CCM_PLL5_CTRL_EN); + udelay(1000); clrbits_le32(&ccm->dram_clk_cfg, 0x01<<31);
clock_set_pll5(CONFIG_DRAM_CLK * 1000000 * DRAM_CLK_MUL); @@ -368,11 +407,6 @@ static void mctl_sys_init(struct dram_para *para) CCM_DRAMCLK_CFG_RST | CCM_DRAMCLK_CFG_UPD); mctl_await_completion(&ccm->dram_clk_cfg, CCM_DRAMCLK_CFG_UPD, 0);
- setbits_le32(&ccm->ahb_reset0_cfg, 1 << 14); - setbits_le32(&ccm->ahb_gate0, 1 << AHB_GATE_OFFSET_MCTL); - setbits_le32(&ccm->mbus_reset, CCM_MBUS_RESET_RESET); - setbits_le32(&ccm->mbus_clk_cfg, MBUS_CLK_GATE); - setbits_le32(&ccm->ahb_reset0_cfg, 1 << AHB_RESET_OFFSET_MCTL); setbits_le32(&ccm->ahb_gate0, 1 << AHB_GATE_OFFSET_MCTL); setbits_le32(&ccm->mbus_reset, CCM_MBUS_RESET_RESET); diff --git a/arch/arm/include/asm/arch-sunxi/dram_sun8i_a83t.h b/arch/arm/include/asm/arch-sunxi/dram_sun8i_a83t.h index 05b6a89..842ad3c 100644 --- a/arch/arm/include/asm/arch-sunxi/dram_sun8i_a83t.h +++ b/arch/arm/include/asm/arch-sunxi/dram_sun8i_a83t.h @@ -198,6 +198,11 @@ struct sunxi_mctl_ctl_reg { #define MCTL_MR2 0x18 /* CWL=8 */ #define MCTL_MR3 0x0
+#define MCTL_LPDDR3_MR0 0x0 +#define MCTL_LPDDR3_MR1 0xc3 /* twr=8, bl=8 */ +#define MCTL_LPDDR3_MR2 0xa /* RL=12, CWL=6 */ +#define MCTL_LPDDR3_MR3 0x0 + #define DRAM_TYPE_DDR3 3 #define DRAM_TYPE_LPDDR3 7 #endif /* _SUNXI_DRAM_SUN8I_A83T_H */