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authorMarshall Dawson <marshalldawson3rd@gmail.com>2019-05-02 12:53:00 -0600
committerPatrick Georgi <pgeorgi@google.com>2019-05-16 10:05:26 +0000
commitf42344a38963cba10604901a6934c7842db42c4d (patch)
tree702b7f733f3ef10fd58a0a88375c9a89f17f1658 /src/soc
parent69486cac74a0e9578c90366feae8abebce5ff834 (diff)
downloadcoreboot-f42344a38963cba10604901a6934c7842db42c4d.tar.xz
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>
Diffstat (limited to 'src/soc')
-rw-r--r--src/soc/amd/stoneyridge/chip.h2
-rw-r--r--src/soc/amd/stoneyridge/gpio.c97
-rw-r--r--src/soc/amd/stoneyridge/i2c.c99
-rw-r--r--src/soc/amd/stoneyridge/include/soc/gpio.h26
-rw-r--r--src/soc/amd/stoneyridge/include/soc/i2c.h49
5 files changed, 149 insertions, 124 deletions
diff --git a/src/soc/amd/stoneyridge/chip.h b/src/soc/amd/stoneyridge/chip.h
index 92223d1962..d1a7d30199 100644
--- a/src/soc/amd/stoneyridge/chip.h
+++ b/src/soc/amd/stoneyridge/chip.h
@@ -20,7 +20,7 @@
#include <stdint.h>
#include <commonlib/helpers.h>
#include <drivers/i2c/designware/dw_i2c.h>
-#include <soc/gpio.h>
+#include <soc/i2c.h>
#include <arch/acpi_device.h>
#define MAX_NODES 1
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);
diff --git a/src/soc/amd/stoneyridge/i2c.c b/src/soc/amd/stoneyridge/i2c.c
index e99f3509ff..c3e5539e19 100644
--- a/src/soc/amd/stoneyridge/i2c.c
+++ b/src/soc/amd/stoneyridge/i2c.c
@@ -13,12 +13,16 @@
* GNU General Public License for more details.
*/
+#include <device/mmio.h>
#include <arch/acpi.h>
#include <console/console.h>
+#include <delay.h>
#include <drivers/i2c/designware/dw_i2c.h>
+#include <amdblocks/acpimmio.h>
#include <soc/iomap.h>
#include <soc/pci_devs.h>
#include <soc/southbridge.h>
+#include <soc/i2c.h>
#include "chip.h"
#define I2C_BUS_ADDRESS(x) (I2C_BASE_ADDRESS + I2C_DEVICE_SIZE * (x))
@@ -140,3 +144,98 @@ struct device_operations stoneyridge_i2c_mmio_ops = {
.acpi_name = i2c_acpi_name,
.acpi_fill_ssdt_generator = dw_i2c_acpi_fill_ssdt,
};
+
+/*
+ * 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]);
+}
diff --git a/src/soc/amd/stoneyridge/include/soc/gpio.h b/src/soc/amd/stoneyridge/include/soc/gpio.h
index fe8240fb11..26d0336d0a 100644
--- a/src/soc/amd/stoneyridge/include/soc/gpio.h
+++ b/src/soc/amd/stoneyridge/include/soc/gpio.h
@@ -36,21 +36,10 @@ struct soc_amd_event {
uint8_t event;
};
-struct soc_amd_i2c_save {
- uint32_t control_value;
- uint8_t mux_value;
-};
-
#define GPIO_MASTER_SWITCH 0xFC
#define GPIO_MASK_STS_EN BIT(28)
#define GPIO_INTERRUPT_EN BIT(30)
-#define GPIO_I2C0_SCL BIT(0)
-#define GPIO_I2C1_SCL BIT(1)
-#define GPIO_I2C2_SCL BIT(2)
-#define GPIO_I2C3_SCL BIT(3)
-#define GPIO_I2C_MASK (BIT(0) | BIT(1) | BIT(2) | BIT(3))
-
#define GPIO_TOTAL_PINS 149
#define GPIO_PIN_IN (1 << 0) /* for byte access */
#define GPIO_PIN_OUT (1 << 6) /* for byte access */
@@ -186,15 +175,6 @@ struct soc_amd_i2c_save {
#define GPIO_147 147
#define GPIO_148 148
-#define I2C0_SCL_PIN GPIO_145
-#define I2C1_SCL_PIN GPIO_147
-#define I2C2_SCL_PIN GPIO_113
-#define I2C3_SCL_PIN GPIO_19
-
-#define GPIO_I2C0_ADDRESS GPIO_BANK2_CONTROL(I2C0_SCL_PIN)
-#define GPIO_I2C1_ADDRESS GPIO_BANK2_CONTROL(I2C1_SCL_PIN)
-#define GPIO_I2C2_ADDRESS GPIO_BANK1_CONTROL(I2C2_SCL_PIN)
-#define GPIO_I2C3_ADDRESS GPIO_BANK0_CONTROL(I2C3_SCL_PIN)
#define GPIO_SCL_HIGH 0
#define GPIO_SCL_LOW GPIO_OUTPUT_ENABLE
@@ -373,11 +353,6 @@ struct soc_amd_i2c_save {
#define GPIO_148_IOMUX_I2C1_SDA 0
#define GPIO_148_IOMUX_GPIOxx 1
-#define I2C0_SCL_PIN_IOMUX_GPIOxx GPIO_145_IOMUX_GPIOxx
-#define I2C1_SCL_PIN_IOMUX_GPIOxx GPIO_147_IOMUX_GPIOxx
-#define I2C2_SCL_PIN_IOMUX_GPIOxx GPIO_113_IOMUX_GPIOxx
-#define I2C3_SCL_PIN_IOMUX_GPIOxx GPIO_19_IOMUX_GPIOxx
-
enum {
GEVENT_0,
GEVENT_1,
@@ -599,7 +574,6 @@ uintptr_t gpio_get_address(gpio_t gpio_num);
* @return none
*/
void sb_program_gpios(const struct soc_amd_gpio *gpio_list_ptr, size_t size);
-void sb_reset_i2c_slaves(void);
/* Return the interrupt status and clear if set. */
int gpio_interrupt_status(gpio_t gpio);
diff --git a/src/soc/amd/stoneyridge/include/soc/i2c.h b/src/soc/amd/stoneyridge/include/soc/i2c.h
new file mode 100644
index 0000000000..62575d0fb8
--- /dev/null
+++ b/src/soc/amd/stoneyridge/include/soc/i2c.h
@@ -0,0 +1,49 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2018 Advanced Micro Devices, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef __STONEYRIDGE_I2C_H__
+#define __STONEYRIDGE_I2C_H__
+
+#include <soc/gpio.h>
+
+struct soc_amd_i2c_save {
+ uint32_t control_value;
+ uint8_t mux_value;
+};
+
+#define GPIO_I2C0_SCL BIT(0)
+#define GPIO_I2C1_SCL BIT(1)
+#define GPIO_I2C2_SCL BIT(2)
+#define GPIO_I2C3_SCL BIT(3)
+#define GPIO_I2C_MASK (BIT(0) | BIT(1) | BIT(2) | BIT(3))
+
+#define I2C0_SCL_PIN GPIO_145
+#define I2C1_SCL_PIN GPIO_147
+#define I2C2_SCL_PIN GPIO_113
+#define I2C3_SCL_PIN GPIO_19
+
+#define GPIO_I2C0_ADDRESS GPIO_BANK2_CONTROL(I2C0_SCL_PIN)
+#define GPIO_I2C1_ADDRESS GPIO_BANK2_CONTROL(I2C1_SCL_PIN)
+#define GPIO_I2C2_ADDRESS GPIO_BANK1_CONTROL(I2C2_SCL_PIN)
+#define GPIO_I2C3_ADDRESS GPIO_BANK0_CONTROL(I2C3_SCL_PIN)
+
+#define I2C0_SCL_PIN_IOMUX_GPIOxx GPIO_145_IOMUX_GPIOxx
+#define I2C1_SCL_PIN_IOMUX_GPIOxx GPIO_147_IOMUX_GPIOxx
+#define I2C2_SCL_PIN_IOMUX_GPIOxx GPIO_113_IOMUX_GPIOxx
+#define I2C3_SCL_PIN_IOMUX_GPIOxx GPIO_19_IOMUX_GPIOxx
+
+void sb_reset_i2c_slaves(void);
+
+#endif /* __STONEYRIDGE_I2C_H__ */