src/soc/mediatek/mt8186/i2c.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 /*
   4  * This file is created based on MT8186 Functional Specification
   5  * Chapter number: 5.10
   6  */
   7
   8 #include <assert.h>
   9 #include <console/console.h>
  10 #include <device/mmio.h>
  11 #include <device/i2c_simple.h>
  12 #include <gpio.h>
  13 #include <soc/i2c.h>
  14
  15 struct mtk_i2c mtk_i2c_bus_controller[] = {
  16         [0] = {
  17                 .i2c_regs = (void *)(I2C0_BASE),
  18                 .i2c_dma_regs = (void *)(I2C0_DMA_BASE),
  19         },
  20         [1] = {
  21                 .i2c_regs = (void *)(I2C1_BASE),
  22                 .i2c_dma_regs = (void *)(I2C1_DMA_BASE),
  23         },
  24         [2] = {
  25                 .i2c_regs = (void *)(I2C2_BASE),
  26                 .i2c_dma_regs = (void *)(I2C2_DMA_BASE),
  27         },
  28         [3] = {
  29                 .i2c_regs = (void *)(I2C3_BASE),
  30                 .i2c_dma_regs = (void *)(I2C3_DMA_BASE),
  31         },
  32         [4] = {
  33                 .i2c_regs = (void *)(I2C4_BASE),
  34                 .i2c_dma_regs = (void *)(I2C4_DMA_BASE),
  35         },
  36         [5] = {
  37                 .i2c_regs = (void *)(I2C5_BASE),
  38                 .i2c_dma_regs = (void *)(I2C5_DMA_BASE),
  39         },
  40         [6] = {
  41                 .i2c_regs = (void *)(I2C6_BASE),
  42                 .i2c_dma_regs = (void *)(I2C6_DMA_BASE),
  43         },
  44         [7] = {
  45                 .i2c_regs = (void *)(I2C7_BASE),
  46                 .i2c_dma_regs = (void *)(I2C7_DMA_BASE),
  47         },
  48         [8] = {
  49                 .i2c_regs = (void *)(I2C8_BASE),
  50                 .i2c_dma_regs = (void *)(I2C8_DMA_BASE),
  51         },
  52         [9] = {
  53                 .i2c_regs = (void *)(I2C9_BASE),
  54                 .i2c_dma_regs = (void *)(I2C9_DMA_BASE),
  55         },
  56 };
  57
  58 _Static_assert(ARRAY_SIZE(mtk_i2c_bus_controller) == I2C_BUS_NUMBER,
  59                "Wrong size of mtk_i2c_bus_controller");
  60
  61 static const struct pad_func i2c_funcs[I2C_BUS_NUMBER][2] = {
  62         [0] = {
  63                 PAD_FUNC_UP(SDA0, SDA0),
  64                 PAD_FUNC_UP(SCL0, SCL0),
  65         },
  66         [1] = {
  67                 PAD_FUNC_UP(SDA1, SDA1),
  68                 PAD_FUNC_UP(SCL1, SCL1),
  69         },
  70         [2] = {
  71                 PAD_FUNC_UP(SDA2, SDA2),
  72                 PAD_FUNC_UP(SCL2, SCL2),
  73         },
  74         [3] = {
  75                 PAD_FUNC_UP(SDA3, SDA3),
  76                 PAD_FUNC_UP(SCL3, SCL3),
  77         },
  78         [4] = {
  79                 PAD_FUNC_UP(SDA4, SDA4),
  80                 PAD_FUNC_UP(SCL4, SCL4),
  81         },
  82         [5] = {
  83                 PAD_FUNC_UP(SDA5, SDA5),
  84                 PAD_FUNC_UP(SCL5, SCL5),
  85         },
  86         [6] = {
  87                 PAD_FUNC_UP(SDA6, SDA6),
  88                 PAD_FUNC_UP(SCL6, SCL6),
  89         },
  90         [7] = {
  91                 PAD_FUNC_UP(SDA7, SDA7),
  92                 PAD_FUNC_UP(SCL7, SCL7),
  93         },
  94         [8] = {
  95                 PAD_FUNC_UP(SDA8, SDA8),
  96                 PAD_FUNC_UP(SCL8, SCL8),
  97         },
  98         [9] = {
  99                 PAD_FUNC_UP(SDA9, SDA9),
 100                 PAD_FUNC_UP(SCL9, SCL9),
 101         },
 102 };
 103
 104 static void mtk_i2c_set_gpio_pinmux(uint8_t bus)
 105 {
 106         assert(bus < I2C_BUS_NUMBER);
 107
 108         const struct pad_func *ptr = i2c_funcs[bus];
 109         for (size_t i = 0; i < 2; i++) {
 110                 gpio_set_mode(ptr[i].gpio, ptr[i].func);
 111                 gpio_set_pull(ptr[i].gpio, GPIO_PULL_ENABLE, ptr[i].select);
 112         }
 113 }
 114
 115 void mtk_i2c_bus_init(uint8_t bus, uint32_t speed)
 116 {
 117         mtk_i2c_speed_init(bus, speed);
 118         mtk_i2c_set_gpio_pinmux(bus);
 119 }
 120
 121 void mtk_i2c_dump_more_info(struct mt_i2c_regs *regs)
 122 {
 123         printk(BIOS_DEBUG, "LTIMING %x\nCLK_DIV %x\n",
 124                read32(&regs->ltiming),
 125                read32(&regs->clock_div));
 126 }
 127
 128 void mtk_i2c_config_timing(struct mt_i2c_regs *regs, struct mtk_i2c *bus_ctrl)
 129 {
 130         write32(&regs->clock_div, bus_ctrl->ac_timing.inter_clk_div);
 131         write32(&regs->timing, bus_ctrl->ac_timing.htiming);
 132         write32(&regs->ltiming, bus_ctrl->ac_timing.ltiming);
 133         write32(&regs->hs, bus_ctrl->ac_timing.hs);
 134         write32(&regs->ext_conf, bus_ctrl->ac_timing.ext);
 135 }