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De-Magic I2C configuration for SFP-EEPROM reads

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logicog
2025-11-02 09:49:13 +01:00
parent 0989b227c0
commit 9c7572b289
3 changed files with 18 additions and 9 deletions
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rtlplayground.c
+6 -5
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@@ -725,11 +725,11 @@ uint8_t sfp_read_reg(uint8_t slot, uint8_t reg)
{
if (slot == 0) {
reg_read_m(RTL837X_REG_I2C_CTRL);
sfr_mask_data(1, 0xff, 0x72);
sfr_mask_data(1, 0xfc, SCL_PIN << 5 | SDA_PIN_0 << 2);
reg_write_m(RTL837X_REG_I2C_CTRL);
} else {
reg_read_m(RTL837X_REG_I2C_CTRL);
sfr_mask_data(1, 0xff, 0x6e);
sfr_mask_data(1, 0xfc, SCL_PIN << 5 | SDA_PIN_1 << 2);
reg_write_m(RTL837X_REG_I2C_CTRL);
}
@@ -1650,9 +1650,10 @@ void setup_serial(void)
void setup_i2c(void)
{
REG_SET(0x0414, 0);
REG_SET(0x0418, 0x00100280);
REG_SET(0x041c, 0);
REG_SET(RTL837X_REG_I2C_MST_IF_CTRL, 0);
// Configure SFP EEPROM address (0x50) as I2C device address
REG_SET(RTL837X_REG_I2C_CTRL, 0x1L << I2C_MEM_ADDR_WIDTH | 0x50 << I2C_DEV_ADDR);
REG_SET(RTL837X_REG_I2C_CTRL2, 0);
// HW Control register, enable I2C?
reg_read_m(RTL837X_PIN_MUX_1);