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 <marshalldawson3rd@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/32650
Reviewed-by: Martin Roth <martinroth@google.com>
Reviewed-by: Richard Spiegel <richard.spiegel@silverbackltd.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

1 files changed, 0 insertions, 97 deletions

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 <device/mmio.h>
 #include <device/device.h>
 #include <console/console.h>
-#include <delay.h>
 #include <gpio.h>
 #include <amdblocks/acpimmio.h>
 #include <soc/gpio.h>
-#include <soc/pci_devs.h>
 #include <assert.h>
 #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);