drivers/memory/ti-aemif.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Keystone2: Asynchronous EMIF Configuration
   4  *
   5  * (C) Copyright 2012-2014
   6  *     Texas Instruments Incorporated, <www.ti.com>
   7  */
   8
   9 #include <common.h>
  10 #include <asm/ti-common/ti-aemif.h>
  11
  12 #define AEMIF_WAITCYCLE_CONFIG          (CONFIG_AEMIF_CNTRL_BASE + 0x4)
  13 #define AEMIF_NAND_CONTROL              (CONFIG_AEMIF_CNTRL_BASE + 0x60)
  14 #define AEMIF_ONENAND_CONTROL           (CONFIG_AEMIF_CNTRL_BASE + 0x5c)
  15 #define AEMIF_CONFIG(cs)                (CONFIG_AEMIF_CNTRL_BASE + 0x10 \
  16                                          + (cs * 4))
  17
  18 #define AEMIF_CFG_SELECT_STROBE(v)      ((v) ? 1 << 31 : 0)
  19 #define AEMIF_CFG_EXTEND_WAIT(v)        ((v) ? 1 << 30 : 0)
  20 #define AEMIF_CFG_WR_SETUP(v)           (((v) & 0x0f) << 26)
  21 #define AEMIF_CFG_WR_STROBE(v)          (((v) & 0x3f) << 20)
  22 #define AEMIF_CFG_WR_HOLD(v)            (((v) & 0x07) << 17)
  23 #define AEMIF_CFG_RD_SETUP(v)           (((v) & 0x0f) << 13)
  24 #define AEMIF_CFG_RD_STROBE(v)          (((v) & 0x3f) << 7)
  25 #define AEMIF_CFG_RD_HOLD(v)            (((v) & 0x07) << 4)
  26 #define AEMIF_CFG_TURN_AROUND(v)        (((v) & 0x03) << 2)
  27 #define AEMIF_CFG_WIDTH(v)              (((v) & 0x03) << 0)
  28
  29 #define set_config_field(reg, field, val)                       \
  30         do {                                                    \
  31                 if (val != -1) {                                \
  32                         reg &= ~AEMIF_CFG_##field(0xffffffff);  \
  33                         reg |=  AEMIF_CFG_##field(val);         \
  34                 }                                               \
  35         } while (0)
  36
  37 static void aemif_configure(int cs, struct aemif_config *cfg)
  38 {
  39         unsigned long tmp;
  40
  41         if (cfg->mode == AEMIF_MODE_NAND) {
  42                 tmp = __raw_readl(AEMIF_NAND_CONTROL);
  43                 tmp |= (1 << cs);
  44                 __raw_writel(tmp, AEMIF_NAND_CONTROL);
  45
  46         } else if (cfg->mode == AEMIF_MODE_ONENAND) {
  47                 tmp = __raw_readl(AEMIF_ONENAND_CONTROL);
  48                 tmp |= (1 << cs);
  49                 __raw_writel(tmp, AEMIF_ONENAND_CONTROL);
  50         }
  51
  52         tmp = __raw_readl(AEMIF_CONFIG(cs));
  53
  54         set_config_field(tmp, SELECT_STROBE,    cfg->select_strobe);
  55         set_config_field(tmp, EXTEND_WAIT,      cfg->extend_wait);
  56         set_config_field(tmp, WR_SETUP,         cfg->wr_setup);
  57         set_config_field(tmp, WR_STROBE,        cfg->wr_strobe);
  58         set_config_field(tmp, WR_HOLD,          cfg->wr_hold);
  59         set_config_field(tmp, RD_SETUP,         cfg->rd_setup);
  60         set_config_field(tmp, RD_STROBE,        cfg->rd_strobe);
  61         set_config_field(tmp, RD_HOLD,          cfg->rd_hold);
  62         set_config_field(tmp, TURN_AROUND,      cfg->turn_around);
  63         set_config_field(tmp, WIDTH,            cfg->width);
  64
  65         __raw_writel(tmp, AEMIF_CONFIG(cs));
  66 }
  67
  68 void aemif_init(int num_cs, struct aemif_config *config)
  69 {
  70         int cs;
  71
  72         if (num_cs > AEMIF_NUM_CS) {
  73                 num_cs = AEMIF_NUM_CS;
  74                 printf("AEMIF: csnum has to be <= 5");
  75         }
  76
  77         for (cs = 0; cs < num_cs; cs++)
  78                 aemif_configure(cs, config + cs);
  79 }