drivers/mfd/tmio_core.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright(c) 2009 Ian Molton <spyro@f2s.com>
   4  */
   5
   6 #include <linux/export.h>
   7 #include <linux/mfd/tmio.h>
   8
   9 #define CNF_CMD     0x04
  10 #define CNF_CTL_BASE   0x10
  11 #define CNF_INT_PIN  0x3d
  12 #define CNF_STOP_CLK_CTL 0x40
  13 #define CNF_GCLK_CTL 0x41
  14 #define CNF_SD_CLK_MODE 0x42
  15 #define CNF_PIN_STATUS 0x44
  16 #define CNF_PWR_CTL_1 0x48
  17 #define CNF_PWR_CTL_2 0x49
  18 #define CNF_PWR_CTL_3 0x4a
  19 #define CNF_CARD_DETECT_MODE 0x4c
  20 #define CNF_SD_SLOT 0x50
  21 #define CNF_EXT_GCLK_CTL_1 0xf0
  22 #define CNF_EXT_GCLK_CTL_2 0xf1
  23 #define CNF_EXT_GCLK_CTL_3 0xf9
  24 #define CNF_SD_LED_EN_1 0xfa
  25 #define CNF_SD_LED_EN_2 0xfe
  26
  27 #define   SDCREN 0x2   /* Enable access to MMC CTL regs. (flag in COMMAND_REG)*/
  28
  29 int tmio_core_mmc_enable(void __iomem *cnf, int shift, unsigned long base)
  30 {
  31         /* Enable the MMC/SD Control registers */
  32         sd_config_write16(cnf, shift, CNF_CMD, SDCREN);
  33         sd_config_write32(cnf, shift, CNF_CTL_BASE, base & 0xfffe);
  34
  35         /* Disable SD power during suspend */
  36         sd_config_write8(cnf, shift, CNF_PWR_CTL_3, 0x01);
  37
  38         /* The below is required but why? FIXME */
  39         sd_config_write8(cnf, shift, CNF_STOP_CLK_CTL, 0x1f);
  40
  41         /* Power down SD bus */
  42         sd_config_write8(cnf, shift, CNF_PWR_CTL_2, 0x00);
  43
  44         return 0;
  45 }
  46 EXPORT_SYMBOL(tmio_core_mmc_enable);
  47
  48 int tmio_core_mmc_resume(void __iomem *cnf, int shift, unsigned long base)
  49 {
  50
  51         /* Enable the MMC/SD Control registers */
  52         sd_config_write16(cnf, shift, CNF_CMD, SDCREN);
  53         sd_config_write32(cnf, shift, CNF_CTL_BASE, base & 0xfffe);
  54
  55         return 0;
  56 }
  57 EXPORT_SYMBOL(tmio_core_mmc_resume);
  58
  59 void tmio_core_mmc_pwr(void __iomem *cnf, int shift, int state)
  60 {
  61         sd_config_write8(cnf, shift, CNF_PWR_CTL_2, state ? 0x02 : 0x00);
  62 }
  63 EXPORT_SYMBOL(tmio_core_mmc_pwr);
  64
  65 void tmio_core_mmc_clk_div(void __iomem *cnf, int shift, int state)
  66 {
  67         sd_config_write8(cnf, shift, CNF_SD_CLK_MODE, state ? 1 : 0);
  68 }
  69 EXPORT_SYMBOL(tmio_core_mmc_clk_div);
  70