sunxi: Add support for LPDDR3 for A83T

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>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

diff --git a/arch/arm/cpu/armv7/sunxi/dram_sun8i_a83t.c b/arch/arm/cpu/armv7/sunxi/dram_sun8i_a83t.c
index 35b6c5e..7c46acd 100644 (file)
--- 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);
@@ -289,6 +321,9 @@ 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 +334,11 @@ 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 +398,7 @@ 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);
@@ -373,6 +413,10 @@ static void mctl_sys_init(struct dram_para *para)
        setbits_le32(&ccm->mbus_reset, CCM_MBUS_RESET_RESET);
        setbits_le32(&ccm->mbus_clk_cfg, MBUS_CLK_GATE);
 
+       para->rank = 2;
+       para->bus_width = 16;
+       mctl_set_cr(para);
+
        /* Set dram master access priority */
        writel(0x0000e00f, &mctl_ctl->clken);   /* normal */
 

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 (file)
--- 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 */