src/soc/mediatek/mt8195/i2c.c

   1 /* SPDX-License-Identifier: GPL-2.0-only OR MIT */
   2
   3 #include <assert.h>
   4 #include <console/console.h>
   5 #include <device/mmio.h>
   6 #include <device/i2c_simple.h>
   7 #include <gpio.h>
   8 #include <soc/i2c.h>
   9
  10 struct mtk_i2c mtk_i2c_bus_controller[] = {
  11         [0] = {
  12                 .i2c_regs = (void *)(I2C_BASE),
  13                 .i2c_dma_regs = (void *)(I2C_DMA_BASE),
  14                 .mt_i2c_flag = I2C_APDMA_ASYNC,
  15         },
  16         [1] = {
  17                 .i2c_regs = (void *)(I2C_BASE + 0x1000),
  18                 .i2c_dma_regs = (void *)(I2C_DMA_BASE + 0x180),
  19                 .mt_i2c_flag = I2C_APDMA_ASYNC,
  20         },
  21         [2] = {
  22                 .i2c_regs = (void *)(I2C_BASE + 0x2000),
  23                 .i2c_dma_regs = (void *)(I2C_DMA_BASE + 0x300),
  24                 .mt_i2c_flag = I2C_APDMA_ASYNC,
  25         },
  26         [3] = {
  27                 .i2c_regs = (void *)(I2C_BASE + 0x3000),
  28                 .i2c_dma_regs = (void *)(I2C_DMA_BASE + 0x400),
  29                 .mt_i2c_flag = I2C_APDMA_ASYNC,
  30         },
  31         [4] = {
  32                 .i2c_regs = (void *)(I2C_BASE + 0x4000),
  33                 .i2c_dma_regs = (void *)(I2C_DMA_BASE + 0x480),
  34                 .mt_i2c_flag = I2C_APDMA_ASYNC,
  35         },
  36         [5] = {
  37                 .i2c_regs = (void *)(I2C_BASE - 0x100000),
  38                 .i2c_dma_regs = (void *)(I2C_DMA_BASE + 0x500),
  39                 .mt_i2c_flag = I2C_APDMA_ASYNC,
  40         },
  41         [6] = {
  42                 .i2c_regs = (void *)(I2C_BASE - 0xFF000),
  43                 .i2c_dma_regs = (void *)(I2C_DMA_BASE + 0x580),
  44                 .mt_i2c_flag = I2C_APDMA_ASYNC,
  45         },
  46         [7] = {
  47                 .i2c_regs = (void *)(I2C_BASE - 0xFE000),
  48                 .i2c_dma_regs = (void *)(I2C_DMA_BASE + 0x600),
  49                 .mt_i2c_flag = I2C_APDMA_ASYNC,
  50         },
  51 };
  52
  53 _Static_assert(ARRAY_SIZE(mtk_i2c_bus_controller) == I2C_BUS_NUMBER,
  54                "Wrong size of mtk_i2c_bus_controller");
  55
  56 struct pad_func {
  57         gpio_t gpio;
  58         u8 func;
  59 };
  60
  61 #define PAD_FUNC(name, func) {GPIO(name), PAD_##name##_FUNC_##func}
  62
  63 static const struct pad_func i2c_funcs[I2C_BUS_NUMBER][2] = {
  64         [0] = {
  65                 PAD_FUNC(SDA0, SDA0),
  66                 PAD_FUNC(SCL0, SCL0),
  67         },
  68         [1] = {
  69                 PAD_FUNC(SDA1, SDA1),
  70                 PAD_FUNC(SCL1, SCL1),
  71         },
  72         [2] = {
  73                 PAD_FUNC(SDA2, SDA2),
  74                 PAD_FUNC(SCL2, SCL2),
  75         },
  76         [3] = {
  77                 PAD_FUNC(SDA3, SDA3),
  78                 PAD_FUNC(SCL3, SCL3),
  79         },
  80         [4] = {
  81                 PAD_FUNC(SDA4, SDA4),
  82                 PAD_FUNC(SCL4, SCL4),
  83         },
  84         [5] = {
  85                 PAD_FUNC(HDMIRX_SCL, SCL5),
  86                 PAD_FUNC(HDMIRX_SDA, SDA5),
  87         },
  88         [6] = {
  89                 PAD_FUNC(HDMITX_SCL, SCL6),
  90                 PAD_FUNC(HDMITX_SDA, SDA6),
  91         },
  92         [7] = {
  93                 PAD_FUNC(HDMIRX_HTPLG, SCL7),
  94                 PAD_FUNC(HDMIRX_PWR5V, SDA7),
  95         },
  96
  97 };
  98
  99 static void mtk_i2c_set_gpio_pinmux(uint8_t bus)
 100 {
 101         assert(bus < I2C_BUS_NUMBER);
 102
 103         const struct pad_func *ptr = i2c_funcs[bus];
 104         for (size_t i = 0; i < 2; i++) {
 105                 gpio_set_mode(ptr[i].gpio, ptr[i].func);
 106                 if (bus <= I2C4)
 107                         gpio_set_pull(ptr[i].gpio, GPIO_PULL_ENABLE, GPIO_PULL_UP);
 108         }
 109 }
 110
 111 void mtk_i2c_bus_init(uint8_t bus, uint32_t speed)
 112 {
 113         mtk_i2c_speed_init(bus, speed);
 114         mtk_i2c_set_gpio_pinmux(bus);
 115 }
 116
 117 void mtk_i2c_dump_more_info(struct mt_i2c_regs *regs)
 118 {
 119         printk(BIOS_DEBUG, "LTIMING %x\nCLK_DIV %x\n",
 120                read32(&regs->ltiming),
 121                read32(&regs->clock_div));
 122 }
 123
 124 void mtk_i2c_config_timing(struct mt_i2c_regs *regs, struct mtk_i2c *bus_ctrl)
 125 {
 126         write32(&regs->clock_div, bus_ctrl->ac_timing.inter_clk_div);
 127         write32(&regs->timing, bus_ctrl->ac_timing.htiming);
 128         write32(&regs->ltiming, bus_ctrl->ac_timing.ltiming);
 129         write32(&regs->hs, bus_ctrl->ac_timing.hs);
 130         write32(&regs->ext_conf, bus_ctrl->ac_timing.ext);
 131 }