From f42344a38963cba10604901a6934c7842db42c4d Mon Sep 17 00:00:00 2001 From: Marshall Dawson Date: Thu, 2 May 2019 12:53:00 -0600 Subject: soc/amd/stoneyridge: Move I2C bus clear out of gpio.c Relocate the I2C bus reset code from gpio.c to i2c.c. When it first went in, gpio.c was a natural location due to the nature of the algorithm. This is preparation for moving most of gpio.c to common code. Change-Id: I3b2d8e1b54e7c5929220d763bd99fe01b0636aaa Signed-off-by: Marshall Dawson Reviewed-on: https://review.coreboot.org/c/coreboot/+/32650 Reviewed-by: Martin Roth Reviewed-by: Richard Spiegel Tested-by: build bot (Jenkins) --- src/soc/amd/stoneyridge/gpio.c | 97 ------------------------------------------ 1 file changed, 97 deletions(-) (limited to 'src/soc/amd/stoneyridge/gpio.c') diff --git a/src/soc/amd/stoneyridge/gpio.c b/src/soc/amd/stoneyridge/gpio.c index 01ced0880b..7c9680582c 100644 --- a/src/soc/amd/stoneyridge/gpio.c +++ b/src/soc/amd/stoneyridge/gpio.c @@ -18,11 +18,9 @@ #include #include #include -#include #include #include #include -#include #include #include "chip.h" @@ -326,101 +324,6 @@ void sb_program_gpios(const struct soc_amd_gpio *gpio_list_ptr, size_t size) edge_level, mask); } -/* - * I2C pins are open drain with external pull up, so in order to bit bang them - * all, SCL pins must become GPIO inputs with no pull, then they need to be - * toggled between input-no-pull and output-low. This table is for the initial - * conversion of all SCL pins to input with no pull. - */ -static const struct soc_amd_gpio i2c_2_gpi[] = { - PAD_GPI(I2C0_SCL_PIN, PULL_NONE), - PAD_GPI(I2C1_SCL_PIN, PULL_NONE), - PAD_GPI(I2C2_SCL_PIN, PULL_NONE), - PAD_GPI(I2C3_SCL_PIN, PULL_NONE), -}; -#define saved_pins_count ARRAY_SIZE(i2c_2_gpi) - -/* - * To program I2C pins without destroying their programming, the registers - * that will be changed need to be saved first. - */ -static void save_i2c_pin_registers(uint8_t gpio, - struct soc_amd_i2c_save *save_table) -{ - uint32_t *gpio_ptr; - - gpio_ptr = (uint32_t *)gpio_get_address(gpio); - save_table->mux_value = iomux_read8(gpio); - save_table->control_value = read32(gpio_ptr); -} - -static void restore_i2c_pin_registers(uint8_t gpio, - struct soc_amd_i2c_save *save_table) -{ - uint32_t *gpio_ptr; - - gpio_ptr = (uint32_t *)gpio_get_address(gpio); - iomux_write8(gpio, save_table->mux_value); - iomux_read8(gpio); - write32(gpio_ptr, save_table->control_value); - read32(gpio_ptr); -} - -/* Slaves to be reset are controlled by devicetree register i2c_scl_reset */ -void sb_reset_i2c_slaves(void) -{ - const struct soc_amd_stoneyridge_config *cfg; - const struct device *dev = pcidev_path_on_root(GNB_DEVFN); - struct soc_amd_i2c_save save_table[saved_pins_count]; - uint8_t i, j, control; - - if (!dev || !dev->chip_info) - return; - cfg = dev->chip_info; - control = cfg->i2c_scl_reset & GPIO_I2C_MASK; - if (control == 0) - return; - - /* Save and reprogram I2C SCL pins */ - for (i = 0; i < saved_pins_count; i++) - save_i2c_pin_registers(i2c_2_gpi[i].gpio, &save_table[i]); - sb_program_gpios(i2c_2_gpi, saved_pins_count); - - /* - * Toggle SCL back and forth 9 times under 100KHz. A single read is - * needed after the writes to force the posted write to complete. - */ - for (j = 0; j < 9; j++) { - if (control & GPIO_I2C0_SCL) - write32((uint32_t *)GPIO_I2C0_ADDRESS, GPIO_SCL_LOW); - if (control & GPIO_I2C1_SCL) - write32((uint32_t *)GPIO_I2C1_ADDRESS, GPIO_SCL_LOW); - if (control & GPIO_I2C2_SCL) - write32((uint32_t *)GPIO_I2C2_ADDRESS, GPIO_SCL_LOW); - if (control & GPIO_I2C3_SCL) - write32((uint32_t *)GPIO_I2C3_ADDRESS, GPIO_SCL_LOW); - - read32((uint32_t *)GPIO_I2C3_ADDRESS); /* Flush posted write */ - udelay(4); /* 4usec gets 85KHz for 1 pin, 70KHz for 4 pins */ - - if (control & GPIO_I2C0_SCL) - write32((uint32_t *)GPIO_I2C0_ADDRESS, GPIO_SCL_HIGH); - if (control & GPIO_I2C1_SCL) - write32((uint32_t *)GPIO_I2C1_ADDRESS, GPIO_SCL_HIGH); - if (control & GPIO_I2C2_SCL) - write32((uint32_t *)GPIO_I2C2_ADDRESS, GPIO_SCL_HIGH); - if (control & GPIO_I2C3_SCL) - write32((uint32_t *)GPIO_I2C3_ADDRESS, GPIO_SCL_HIGH); - - read32((uint32_t *)GPIO_I2C3_ADDRESS); /* Flush posted write */ - udelay(4); - } - - /* Restore I2C pins. */ - for (i = 0; i < saved_pins_count; i++) - restore_i2c_pin_registers(i2c_2_gpi[i].gpio, &save_table[i]); -} - int gpio_interrupt_status(gpio_t gpio) { uintptr_t gpio_address = gpio_get_address(gpio); -- cgit v1.2.3