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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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rtl837x_common.h
+5 -1
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@@ -5,7 +5,11 @@
#include <stdint.h> #include <stdint.h>
// This has to be set to the number of SFP+ ports, i.e. 1 or 2 // This has to be set to the number of SFP+ ports, i.e. 1 or 2
#define NSFP 2 #define NSFP 2
// SCL and SDA pin numbers for SFP cage 0 and SFP cage 1
#define SCL_PIN 3
#define SDA_PIN_0 4
#define SDA_PIN_1 3
// Define Port-masks for 9-port devices and 6-port devices // Define Port-masks for 9-port devices and 6-port devices
#define PMASK_9 0x1ff #define PMASK_9 0x1ff
rtl837x_regs.h
+7 -3
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@@ -66,9 +66,13 @@
/* /*
* I2C controller * I2C controller
*/ */
#define RTL837X_REG_I2C_CTRL 0x0418 #define RTL837X_REG_I2C_MST_IF_CTRL 0x0414
#define RTL837X_REG_I2C_IN 0x0420 #define RTL837X_REG_I2C_CTRL 0x0418
#define RTL837X_REG_I2C_OUT 0x0424 #define I2C_DEV_ADDR 3
#define I2C_MEM_ADDR_WIDTH 20
#define RTL837X_REG_I2C_CTRL2 0x041c
#define RTL837X_REG_I2C_IN 0x0420
#define RTL837X_REG_I2C_OUT 0x0424
/* /*
* NIC Related registers * NIC Related registers
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) { if (slot == 0) {
reg_read_m(RTL837X_REG_I2C_CTRL); 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); reg_write_m(RTL837X_REG_I2C_CTRL);
} else { } else {
reg_read_m(RTL837X_REG_I2C_CTRL); 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); reg_write_m(RTL837X_REG_I2C_CTRL);
} }
@@ -1650,9 +1650,10 @@ void setup_serial(void)
void setup_i2c(void) void setup_i2c(void)
{ {
REG_SET(0x0414, 0); REG_SET(RTL837X_REG_I2C_MST_IF_CTRL, 0);
REG_SET(0x0418, 0x00100280); // Configure SFP EEPROM address (0x50) as I2C device address
REG_SET(0x041c, 0); 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? // HW Control register, enable I2C?
reg_read_m(RTL837X_PIN_MUX_1); reg_read_m(RTL837X_PIN_MUX_1);