board/compulab/imx8mm-cl-iot-gate/eeprom_spl.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /* (C) Copyright 2019 CompuLab, Ltd. <www.compulab.co.il> */
   3
   4 #include <common.h>
   5 #include <i2c.h>
   6 #include <linux/kernel.h>
   7 #include <asm/arch/imx8mq_pins.h>
   8 #include <asm/mach-imx/gpio.h>
   9 #include <asm-generic/gpio.h>
  10 #include <asm/setup.h>
  11 #include <linux/delay.h>
  12
  13 #ifdef CONFIG_SPL_BUILD
  14
  15 #define CONFIG_SYS_I2C_EEPROM_ADDR_P1   0x51
  16
  17 static iomux_v3_cfg_t const eeprom_pads[] = {
  18         IMX8MQ_PAD_GPIO1_IO13__GPIO1_IO13 | MUX_PAD_CTRL(NO_PAD_CTRL),
  19 };
  20
  21 #define EEPROM_WP_GPIO IMX_GPIO_NR(1, 13)
  22
  23 static void cl_eeprom_we(int enable)
  24 {
  25         static int done;
  26
  27         if (done) {
  28                 gpio_direction_output(EEPROM_WP_GPIO, enable);
  29                 return;
  30         }
  31
  32         imx_iomux_v3_setup_multiple_pads(eeprom_pads, ARRAY_SIZE(eeprom_pads));
  33         gpio_request(EEPROM_WP_GPIO, "eeprom_wp");
  34         gpio_direction_output(EEPROM_WP_GPIO, enable);
  35         done = 1;
  36 }
  37
  38 static int cl_eeprom_read(uint offset, uchar *buf, int len)
  39 {
  40         struct udevice *dev;
  41         int ret;
  42
  43         ret = i2c_get_chip_for_busnum(1, CONFIG_SYS_I2C_EEPROM_ADDR_P1,
  44                                       CONFIG_SYS_I2C_EEPROM_ADDR_LEN, &dev);
  45         if (ret) {
  46                 printf("%s: Cannot find EEPROM: %d\n", __func__, ret);
  47                 return ret;
  48         }
  49
  50         return dm_i2c_read(dev, offset, buf, len);
  51 }
  52
  53 static int cl_eeprom_write(uint offset, uchar *buf, int len)
  54 {
  55         struct udevice *dev;
  56         int ret;
  57
  58         cl_eeprom_we(1);
  59
  60         ret = i2c_get_chip_for_busnum(1, CONFIG_SYS_I2C_EEPROM_ADDR_P1,
  61                                       CONFIG_SYS_I2C_EEPROM_ADDR_LEN, &dev);
  62         if (ret) {
  63                 printf("%s: Cannot find EEPROM: %d\n", __func__, ret);
  64                 return ret;
  65         }
  66
  67         return dm_i2c_write(dev, offset, buf, len);
  68 }
  69
  70 /* Reserved for fututre use area */
  71 #define BOARD_DDRINFO_OFFSET 0x40
  72 #define BOARD_DDR_SIZE 4
  73 static u32 board_ddrinfo = 0xdeadbeef;
  74
  75 #define BOARD_DDRSUBIND_OFFSET 0x44
  76 #define BOARD_DDRSUBIND_SIZE 1
  77 static u8 board_ddrsubind = 0xff;
  78
  79 #define BOARD_OSIZE_OFFSET 0x80
  80 #define BOARD_OSIZE_SIZE 4
  81 static u32 board_osize = 0xdeadbeef;
  82
  83 #define BOARD_DDRINFO_VALID(A) ((A) != 0xdeadbeef)
  84
  85 u32 cl_eeprom_get_ddrinfo(void)
  86 {
  87         if (!BOARD_DDRINFO_VALID(board_ddrinfo)) {
  88                 if (cl_eeprom_read(BOARD_DDRINFO_OFFSET, (uchar *)&board_ddrinfo, BOARD_DDR_SIZE))
  89                         return 0;
  90         }
  91         return board_ddrinfo;
  92 };
  93
  94 u32 cl_eeprom_set_ddrinfo(u32 ddrinfo)
  95 {
  96         if (cl_eeprom_write(BOARD_DDRINFO_OFFSET, (uchar *)&ddrinfo, BOARD_DDR_SIZE))
  97                 return 0;
  98
  99         board_ddrinfo = ddrinfo;
 100
 101         return board_ddrinfo;
 102 };
 103
 104 u8 cl_eeprom_get_subind(void)
 105 {
 106         if (cl_eeprom_read(BOARD_DDRSUBIND_OFFSET, (uchar *)&board_ddrsubind, BOARD_DDRSUBIND_SIZE))
 107                 return 0xff;
 108
 109         return board_ddrsubind;
 110 };
 111
 112 u8 cl_eeprom_set_subind(u8 ddrsubind)
 113 {
 114         if (cl_eeprom_write(BOARD_DDRSUBIND_OFFSET, (uchar *)&ddrsubind, BOARD_DDRSUBIND_SIZE))
 115                 return 0xff;
 116         board_ddrsubind = ddrsubind;
 117
 118         return board_ddrsubind;
 119 };
 120
 121 /* override-size ifaces */
 122 u32 cl_eeprom_get_osize(void)
 123 {
 124         if (cl_eeprom_read(BOARD_OSIZE_OFFSET, (uchar *)&board_osize, BOARD_OSIZE_SIZE))
 125                 return 0;
 126
 127         return board_osize;
 128 };
 129 #endif