arch/arm/cpu/arm1176/tnetv107x/aemif.c

   1 /*
   2  * TNETV107X: Asynchronous EMIF Configuration
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0+
   5  */
   6
   7 #include <common.h>
   8 #include <asm/io.h>
   9 #include <asm/arch/clock.h>
  10 #include <asm/arch/mux.h>
  11
  12 #define ASYNC_EMIF_BASE                 TNETV107X_ASYNC_EMIF_CNTRL_BASE
  13 #define ASYNC_EMIF_CONFIG(cs)           (ASYNC_EMIF_BASE+0x10+(cs)*4)
  14 #define ASYNC_EMIF_ONENAND_CONTROL      (ASYNC_EMIF_BASE+0x5c)
  15 #define ASYNC_EMIF_NAND_CONTROL         (ASYNC_EMIF_BASE+0x60)
  16 #define ASYNC_EMIF_WAITCYCLE_CONFIG     (ASYNC_EMIF_BASE+0x4)
  17
  18 #define CONFIG_SELECT_STROBE(v)         ((v) ? 1 << 31 : 0)
  19 #define CONFIG_EXTEND_WAIT(v)           ((v) ? 1 << 30 : 0)
  20 #define CONFIG_WR_SETUP(v)              (((v) & 0x0f) << 26)
  21 #define CONFIG_WR_STROBE(v)             (((v) & 0x3f) << 20)
  22 #define CONFIG_WR_HOLD(v)               (((v) & 0x07) << 17)
  23 #define CONFIG_RD_SETUP(v)              (((v) & 0x0f) << 13)
  24 #define CONFIG_RD_STROBE(v)             (((v) & 0x3f) << 7)
  25 #define CONFIG_RD_HOLD(v)               (((v) & 0x07) << 4)
  26 #define CONFIG_TURN_AROUND(v)           (((v) & 0x03) << 2)
  27 #define CONFIG_WIDTH(v)                 (((v) & 0x03) << 0)
  28
  29 #define NUM_CS                          4
  30
  31 #define set_config_field(reg, field, val)                       \
  32         do {                                                    \
  33                 if (val != -1) {                                \
  34                         reg &= ~CONFIG_##field(0xffffffff);     \
  35                         reg |=  CONFIG_##field(val);            \
  36                 }                                               \
  37         } while (0)
  38
  39 void configure_async_emif(int cs, struct async_emif_config *cfg)
  40 {
  41         unsigned long tmp;
  42
  43         if (cfg->mode == ASYNC_EMIF_MODE_NAND) {
  44                 tmp = __raw_readl(ASYNC_EMIF_NAND_CONTROL);
  45                 tmp |= (1 << cs);
  46                 __raw_writel(tmp, ASYNC_EMIF_NAND_CONTROL);
  47
  48         } else if (cfg->mode == ASYNC_EMIF_MODE_ONENAND) {
  49                 tmp = __raw_readl(ASYNC_EMIF_ONENAND_CONTROL);
  50                 tmp |= (1 << cs);
  51                 __raw_writel(tmp, ASYNC_EMIF_ONENAND_CONTROL);
  52         }
  53
  54         tmp = __raw_readl(ASYNC_EMIF_CONFIG(cs));
  55
  56         set_config_field(tmp, SELECT_STROBE,    cfg->select_strobe);
  57         set_config_field(tmp, EXTEND_WAIT,      cfg->extend_wait);
  58         set_config_field(tmp, WR_SETUP,         cfg->wr_setup);
  59         set_config_field(tmp, WR_STROBE,        cfg->wr_strobe);
  60         set_config_field(tmp, WR_HOLD,          cfg->wr_hold);
  61         set_config_field(tmp, RD_SETUP,         cfg->rd_setup);
  62         set_config_field(tmp, RD_STROBE,        cfg->rd_strobe);
  63         set_config_field(tmp, RD_HOLD,          cfg->rd_hold);
  64         set_config_field(tmp, TURN_AROUND,      cfg->turn_around);
  65         set_config_field(tmp, WIDTH,            cfg->width);
  66
  67         __raw_writel(tmp, ASYNC_EMIF_CONFIG(cs));
  68 }
  69
  70 void init_async_emif(int num_cs, struct async_emif_config *config)
  71 {
  72         int cs;
  73
  74         clk_enable(TNETV107X_LPSC_AEMIF);
  75
  76         for (cs = 0; cs < num_cs; cs++)
  77                 configure_async_emif(cs, config + cs);
  78 }