arch/arm/cpu/armv7/sunxi/dram_sun8i_a33.c

   1 /*
   2  * Sun8i a33 platform dram controller init.
   3  *
   4  * (C) Copyright 2007-2015 Allwinner Technology Co.
   5  *                         Jerry Wang <wangflord@allwinnertech.com>
   6  * (C) Copyright 2015      Vishnu Patekar <vishnupatekar0510@gmail.com>
   7  * (C) Copyright 2015      Hans de Goede <hdegoede@redhat.com>
   8  *
   9  * SPDX-License-Identifier:     GPL-2.0+
  10  */
  11 #include <common.h>
  12 #include <errno.h>
  13 #include <asm/io.h>
  14 #include <asm/arch/clock.h>
  15 #include <asm/arch/dram.h>
  16 #include <asm/arch/prcm.h>
  17 #include <linux/kconfig.h>
  18
  19 /* PLL runs at 2x dram-clk, controller runs at PLL / 4 (dram-clk / 2) */
  20 #define DRAM_CLK_MUL 2
  21 #define DRAM_CLK_DIV 4
  22 #define DRAM_SIGMA_DELTA_ENABLE 1
  23
  24 struct dram_para {
  25         u8 cs1;
  26         u8 seq;
  27         u8 bank;
  28         u8 rank;
  29         u8 rows;
  30         u8 bus_width;
  31         u16 page_size;
  32 };
  33
  34 static void mctl_set_cr(struct dram_para *para)
  35 {
  36         struct sunxi_mctl_com_reg * const mctl_com =
  37                         (struct sunxi_mctl_com_reg *)SUNXI_DRAM_COM_BASE;
  38
  39         writel(MCTL_CR_CS1_CONTROL(para->cs1) | MCTL_CR_UNKNOWN |
  40                MCTL_CR_CHANNEL(1) | MCTL_CR_DDR3 |
  41                (para->seq ? MCTL_CR_SEQUENCE : 0) |
  42                ((para->bus_width == 16) ? MCTL_CR_BUSW16 : MCTL_CR_BUSW8) |
  43                MCTL_CR_PAGE_SIZE(para->page_size) | MCTL_CR_ROW(para->rows) |
  44                MCTL_CR_BANK(para->bank) | MCTL_CR_RANK(para->rank),
  45                &mctl_com->cr);
  46 }
  47
  48 static void auto_detect_dram_size(struct dram_para *para)
  49 {
  50         u8 orig_rank = para->rank;
  51         int rows, columns;
  52
  53         /* Row detect */
  54         para->page_size = 512;
  55         para->seq = 1;
  56         para->rows = 16;
  57         para->rank = 1;
  58         mctl_set_cr(para);
  59         for (rows = 11 ; rows < 16 ; rows++) {
  60                 if (mctl_mem_matches(1 << (rows + 9))) /* row-column */
  61                         break;
  62         }
  63
  64         /* Column (page size) detect */
  65         para->rows = 11;
  66         para->page_size = 8192;
  67         mctl_set_cr(para);
  68         for (columns = 9 ; columns < 13 ; columns++) {
  69                 if (mctl_mem_matches(1 << columns))
  70                         break;
  71         }
  72
  73         para->seq = 0;
  74         para->rank = orig_rank;
  75         para->rows = rows;
  76         para->page_size = 1 << columns;
  77         mctl_set_cr(para);
  78 }
  79
  80 static inline int ns_to_t(int nanoseconds)
  81 {
  82         const unsigned int ctrl_freq =
  83                 CONFIG_DRAM_CLK * DRAM_CLK_MUL / DRAM_CLK_DIV;
  84
  85         return (ctrl_freq * nanoseconds + 999) / 1000;
  86 }
  87
  88 static void auto_set_timing_para(struct dram_para *para)
  89 {
  90         struct sunxi_mctl_ctl_reg * const mctl_ctl =
  91                 (struct sunxi_mctl_ctl_reg *)SUNXI_DRAM_CTL0_BASE;
  92         u32 reg_val;
  93
  94         u8 tccd         = 2;
  95         u8 tfaw         = ns_to_t(50);
  96         u8 trrd         = max(ns_to_t(10), 4);
  97         u8 trcd         = ns_to_t(15);
  98         u8 trc          = ns_to_t(53);
  99         u8 txp          = max(ns_to_t(8), 3);
 100         u8 twtr         = max(ns_to_t(8), 4);
 101         u8 trtp         = max(ns_to_t(8), 4);
 102         u8 twr          = max(ns_to_t(15), 3);
 103         u8 trp          = ns_to_t(15);
 104         u8 tras         = ns_to_t(38);
 105
 106         u16 trefi       = ns_to_t(7800) / 32;
 107         u16 trfc        = ns_to_t(350);
 108
 109         /* Fixed timing parameters */
 110         u8 tmrw         = 0;
 111         u8 tmrd         = 4;
 112         u8 tmod         = 12;
 113         u8 tcke         = 3;
 114         u8 tcksrx       = 5;
 115         u8 tcksre       = 5;
 116         u8 tckesr       = 4;
 117         u8 trasmax      = 24;
 118         u8 tcl          = 6; /* CL 12 */
 119         u8 tcwl         = 4; /* CWL 8 */
 120         u8 t_rdata_en   = 4;
 121         u8 wr_latency   = 2;
 122
 123         u32 tdinit0     = (500 * CONFIG_DRAM_CLK) + 1;          /* 500us */
 124         u32 tdinit1     = (360 * CONFIG_DRAM_CLK) / 1000 + 1;   /* 360ns */
 125         u32 tdinit2     = (200 * CONFIG_DRAM_CLK) + 1;          /* 200us */
 126         u32 tdinit3     = (1 * CONFIG_DRAM_CLK) + 1;            /* 1us */
 127
 128         u8 twtp         = tcwl + 2 + twr;       /* WL + BL / 2 + tWR */
 129         u8 twr2rd       = tcwl + 2 + twtr;      /* WL + BL / 2 + tWTR */
 130         u8 trd2wr       = tcl + 2 + 1 - tcwl;   /* RL + BL / 2 + 2 - WL */
 131
 132         /* Set work mode register */
 133         mctl_set_cr(para);
 134         /* Set mode register */
 135         writel(MCTL_MR0, &mctl_ctl->mr0);
 136         writel(MCTL_MR1, &mctl_ctl->mr1);
 137         writel(MCTL_MR2, &mctl_ctl->mr2);
 138         writel(MCTL_MR3, &mctl_ctl->mr3);
 139         /* Set dram timing */
 140         reg_val = (twtp << 24) | (tfaw << 16) | (trasmax << 8) | (tras << 0);
 141         writel(reg_val, &mctl_ctl->dramtmg0);
 142         reg_val = (txp << 16) | (trtp << 8) | (trc << 0);
 143         writel(reg_val, &mctl_ctl->dramtmg1);
 144         reg_val = (tcwl << 24) | (tcl << 16) | (trd2wr << 8) | (twr2rd << 0);
 145         writel(reg_val, &mctl_ctl->dramtmg2);
 146         reg_val = (tmrw << 16) | (tmrd << 12) | (tmod << 0);
 147         writel(reg_val, &mctl_ctl->dramtmg3);
 148         reg_val = (trcd << 24) | (tccd << 16) | (trrd << 8) | (trp << 0);
 149         writel(reg_val, &mctl_ctl->dramtmg4);
 150         reg_val = (tcksrx << 24) | (tcksre << 16) | (tckesr << 8) | (tcke << 0);
 151         writel(reg_val, &mctl_ctl->dramtmg5);
 152         /* Set two rank timing and exit self-refresh timing */
 153         reg_val = readl(&mctl_ctl->dramtmg8);
 154         reg_val &= ~(0xff << 8);
 155         reg_val &= ~(0xff << 0);
 156         reg_val |= (0x33 << 8);
 157         reg_val |= (0x8 << 0);
 158         writel(reg_val, &mctl_ctl->dramtmg8);
 159         /* Set phy interface time */
 160         reg_val = (0x2 << 24) | (t_rdata_en << 16) | (0x1 << 8)
 161                         | (wr_latency << 0);
 162         /* PHY interface write latency and read latency configure */
 163         writel(reg_val, &mctl_ctl->pitmg0);
 164         /* Set phy time  PTR0-2 use default */
 165         writel(((tdinit0 << 0) | (tdinit1 << 20)), &mctl_ctl->ptr3);
 166         writel(((tdinit2 << 0) | (tdinit3 << 20)), &mctl_ctl->ptr4);
 167         /* Set refresh timing */
 168         reg_val = (trefi << 16) | (trfc << 0);
 169         writel(reg_val, &mctl_ctl->rfshtmg);
 170 }
 171
 172 static void mctl_set_pir(u32 val)
 173 {
 174         struct sunxi_mctl_ctl_reg * const mctl_ctl =
 175                 (struct sunxi_mctl_ctl_reg *)SUNXI_DRAM_CTL0_BASE;
 176
 177         writel(val, &mctl_ctl->pir);
 178         mctl_await_completion(&mctl_ctl->pgsr0, 0x1, 0x1);
 179 }
 180
 181 static void mctl_data_train_cfg(struct dram_para *para)
 182 {
 183         struct sunxi_mctl_ctl_reg * const mctl_ctl =
 184                 (struct sunxi_mctl_ctl_reg *)SUNXI_DRAM_CTL0_BASE;
 185
 186         if (para->rank == 2)
 187                 clrsetbits_le32(&mctl_ctl->dtcr, 0x3 << 24, 0x3 << 24);
 188         else
 189                 clrsetbits_le32(&mctl_ctl->dtcr, 0x3 << 24, 0x1 << 24);
 190 }
 191
 192 static int mctl_train_dram(struct dram_para *para)
 193 {
 194         struct sunxi_mctl_ctl_reg * const mctl_ctl =
 195                 (struct sunxi_mctl_ctl_reg *)SUNXI_DRAM_CTL0_BASE;
 196
 197         mctl_data_train_cfg(para);
 198         mctl_set_pir(0x5f3);
 199
 200         return ((readl(&mctl_ctl->pgsr0) >> 20) & 0xff) ? -EIO : 0;
 201 }
 202
 203 static int mctl_channel_init(struct dram_para *para)
 204 {
 205         struct sunxi_mctl_ctl_reg * const mctl_ctl =
 206                 (struct sunxi_mctl_ctl_reg *)SUNXI_DRAM_CTL0_BASE;
 207         struct sunxi_mctl_com_reg * const mctl_com =
 208                 (struct sunxi_mctl_com_reg *)SUNXI_DRAM_COM_BASE;
 209         u32 low_data_lines_status;  /* Training status of datalines 0 - 7 */
 210         u32 high_data_lines_status; /* Training status of datalines 8 - 15 */
 211
 212         auto_set_timing_para(para);
 213
 214         /* Disable dram VTC */
 215         clrbits_le32(&mctl_ctl->pgcr0, 0x3f << 0);
 216
 217         /* Set ODT */
 218         if ((CONFIG_DRAM_CLK > 400) && IS_ENABLED(CONFIG_DRAM_ODT_EN)) {
 219                 setbits_le32(DXnGCR0(0), 0x3 << 9);
 220                 setbits_le32(DXnGCR0(1), 0x3 << 9);
 221         } else {
 222                 clrbits_le32(DXnGCR0(0), 0x3 << 9);
 223                 clrbits_le32(DXnGCR0(1), 0x3 << 9);
 224         }
 225
 226         /* set PLL configuration */
 227         if (CONFIG_DRAM_CLK >= 480)
 228                 setbits_le32(&mctl_ctl->pllgcr, 0x1 << 18);
 229         else
 230                 setbits_le32(&mctl_ctl->pllgcr, 0x3 << 18);
 231
 232         /* Auto detect dram config, set 2 rank and 16bit bus-width */
 233         para->cs1 = 0;
 234         para->rank = 2;
 235         para->bus_width = 16;
 236         mctl_set_cr(para);
 237
 238         /* Open DQS gating */
 239         clrbits_le32(&mctl_ctl->pgcr2, (0x3 << 6));
 240         clrbits_le32(&mctl_ctl->dqsgmr, (0x1 << 8) | (0x7));
 241
 242         mctl_data_train_cfg(para);
 243
 244         /* ZQ calibration */
 245         writel(CONFIG_DRAM_ZQ & 0xff, &mctl_ctl->zqcr1);
 246         /* CA calibration */
 247         mctl_set_pir(0x00000003);
 248         /* More ZQ calibration */
 249         writel(readl(&mctl_ctl->zqsr0) | 0x10000000, &mctl_ctl->zqcr2);
 250         writel((CONFIG_DRAM_ZQ >> 8) & 0xff, &mctl_ctl->zqcr1);
 251
 252         /* DQS gate training */
 253         if (mctl_train_dram(para) != 0) {
 254                 low_data_lines_status  = (readl(DXnGSR0(0)) >> 24) & 0x03;
 255                 high_data_lines_status = (readl(DXnGSR0(1)) >> 24) & 0x03;
 256
 257                 if (low_data_lines_status == 0x3)
 258                         return -EIO;
 259
 260                 /* DRAM has only one rank */
 261                 para->rank = 1;
 262                 mctl_set_cr(para);
 263
 264                 if (low_data_lines_status == high_data_lines_status)
 265                         goto done; /* 16 bit bus, 1 rank */
 266
 267                 if (!(low_data_lines_status & high_data_lines_status)) {
 268                         /* Retry 16 bit bus-width with CS1 set */
 269                         para->cs1 = 1;
 270                         mctl_set_cr(para);
 271                         if (mctl_train_dram(para) == 0)
 272                                 goto done;
 273                 }
 274
 275                 /* Try 8 bit bus-width */
 276                 writel(0x0, DXnGCR0(1)); /* Disable high DQ */
 277                 para->cs1 = 0;
 278                 para->bus_width = 8;
 279                 mctl_set_cr(para);
 280                 if (mctl_train_dram(para) != 0)
 281                         return -EIO;
 282         }
 283 done:
 284         /* Check the dramc status */
 285         mctl_await_completion(&mctl_ctl->statr, 0x1, 0x1);
 286
 287         /* Close DQS gating */
 288         setbits_le32(&mctl_ctl->pgcr2, 0x3 << 6);
 289
 290         /* Enable master access */
 291         writel(0xffffffff, &mctl_com->maer);
 292
 293         return 0;
 294 }
 295
 296 static void mctl_sys_init(struct dram_para *para)
 297 {
 298         struct sunxi_ccm_reg * const ccm =
 299                         (struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
 300         struct sunxi_mctl_ctl_reg * const mctl_ctl =
 301                         (struct sunxi_mctl_ctl_reg *)SUNXI_DRAM_CTL0_BASE;
 302         struct sunxi_mctl_com_reg * const mctl_com =
 303                         (struct sunxi_mctl_com_reg *)SUNXI_DRAM_COM_BASE;
 304
 305         clrsetbits_le32(&ccm->dram_pll_cfg, CCM_DRAMPLL_CFG_SRC_MASK,
 306                         CCM_DRAMPLL_CFG_SRC_PLL11);
 307
 308         clock_set_pll11(CONFIG_DRAM_CLK * 1000000 * DRAM_CLK_MUL,
 309                         DRAM_SIGMA_DELTA_ENABLE);
 310
 311         clrsetbits_le32(&ccm->dram_clk_cfg, CCM_DRAMCLK_CFG_DIV_MASK,
 312                         CCM_DRAMCLK_CFG_DIV(DRAM_CLK_DIV) |
 313                         CCM_DRAMCLK_CFG_RST | CCM_DRAMCLK_CFG_UPD);
 314         mctl_await_completion(&ccm->dram_clk_cfg, CCM_DRAMCLK_CFG_UPD, 0);
 315
 316         setbits_le32(&ccm->ahb_reset0_cfg, 1 << AHB_RESET_OFFSET_MCTL);
 317         setbits_le32(&ccm->ahb_gate0, 1 << AHB_GATE_OFFSET_MCTL);
 318         setbits_le32(&ccm->mbus_reset, CCM_MBUS_RESET_RESET);
 319         setbits_le32(&ccm->mbus0_clk_cfg, MBUS_CLK_GATE);
 320
 321         /* Set dram master access priority */
 322         writel(0x0, &mctl_com->mapr);
 323         writel(0x0f802f01, &mctl_ctl->sched);
 324         writel(0x0000400f, &mctl_ctl->clken);   /* normal */
 325
 326         udelay(250);
 327 }
 328
 329 unsigned long sunxi_dram_init(void)
 330 {
 331         struct sunxi_mctl_com_reg * const mctl_com =
 332                         (struct sunxi_mctl_com_reg *)SUNXI_DRAM_COM_BASE;
 333         struct sunxi_mctl_ctl_reg * const mctl_ctl =
 334                         (struct sunxi_mctl_ctl_reg *)SUNXI_DRAM_CTL0_BASE;
 335
 336         struct dram_para para = {
 337                 .cs1 = 0,
 338                 .bank = 1,
 339                 .rank = 1,
 340                 .rows = 15,
 341                 .bus_width = 16,
 342                 .page_size = 2048,
 343         };
 344
 345         mctl_sys_init(&para);
 346
 347         if (mctl_channel_init(&para) != 0)
 348                 return 0;
 349
 350         auto_detect_dram_size(&para);
 351
 352         /* Enable master software clk */
 353         writel(readl(&mctl_com->swonr) | 0x3ffff, &mctl_com->swonr);
 354
 355         /* Set DRAM ODT MAP */
 356         if (para.rank == 2)
 357                 writel(0x00000303, &mctl_ctl->odtmap);
 358         else
 359                 writel(0x00000201, &mctl_ctl->odtmap);
 360
 361         return para.page_size * (para.bus_width / 8) *
 362                 (1 << (para.bank + para.rank + para.rows));
 363 }