summaryrefslogtreecommitdiff
path: root/src/drivers/i2c
diff options
context:
space:
mode:
Diffstat (limited to 'src/drivers/i2c')
-rw-r--r--src/drivers/i2c/ptn3460/Kconfig5
-rw-r--r--src/drivers/i2c/ptn3460/Makefile.inc1
-rw-r--r--src/drivers/i2c/ptn3460/chip.h3
-rw-r--r--src/drivers/i2c/ptn3460/ptn3460.c157
-rw-r--r--src/drivers/i2c/ptn3460/ptn3460.h73
5 files changed, 239 insertions, 0 deletions
diff --git a/src/drivers/i2c/ptn3460/Kconfig b/src/drivers/i2c/ptn3460/Kconfig
new file mode 100644
index 0000000000..6dcdbc0915
--- /dev/null
+++ b/src/drivers/i2c/ptn3460/Kconfig
@@ -0,0 +1,5 @@
+config DRIVERS_I2C_PTN3460
+ bool
+ default n
+ help
+ Enable support for external display bridge (eDP to LVDS) PTN3460.
diff --git a/src/drivers/i2c/ptn3460/Makefile.inc b/src/drivers/i2c/ptn3460/Makefile.inc
new file mode 100644
index 0000000000..abe9a0560b
--- /dev/null
+++ b/src/drivers/i2c/ptn3460/Makefile.inc
@@ -0,0 +1 @@
+ramstage-$(CONFIG_DRIVERS_I2C_PTN3460) += ptn3460.c
diff --git a/src/drivers/i2c/ptn3460/chip.h b/src/drivers/i2c/ptn3460/chip.h
new file mode 100644
index 0000000000..8bd6d9e7d1
--- /dev/null
+++ b/src/drivers/i2c/ptn3460/chip.h
@@ -0,0 +1,3 @@
+struct drivers_i2c_ptn3460_config {
+
+};
diff --git a/src/drivers/i2c/ptn3460/ptn3460.c b/src/drivers/i2c/ptn3460/ptn3460.c
new file mode 100644
index 0000000000..ef25745ed1
--- /dev/null
+++ b/src/drivers/i2c/ptn3460/ptn3460.c
@@ -0,0 +1,157 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2019 Siemens AG
+ *
+ * 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.
+ */
+
+
+#include <console/console.h>
+#include <device/i2c_bus.h>
+#include <types.h>
+
+#include "ptn3460.h"
+
+/**
+ * \brief This function selects one of 7 EDID-tables inside PTN3460
+ * which should be emulated on display port and turn emulation ON
+ * @param *dev Pointer to the relevant I2C controller
+ * @param edid_num Number of EDID to emulate (0..6)
+ * @return PTN_SUCCESS or error code
+ */
+static int ptn_select_edid(struct device *dev, uint8_t edid_num)
+{
+ int status = 0;
+ u8 val;
+
+ if (edid_num > PTN_MAX_EDID_NUM)
+ return PTN_INVALID_EDID;
+ val = (edid_num << 1) | PTN_ENABLE_EMULATION;
+ status = i2c_dev_writeb_at(dev, PTN_CONFIG_OFF + 4, val);
+ return status ? (PTN_BUS_ERROR | status) : PTN_SUCCESS;
+}
+
+/**
+ * \brief This function writes one EDID data structure to PTN3460
+ * @param *dev Pointer to the relevant I2C controller
+ * @param edid_num Number of EDID that must be written (0..6)
+ * @param *data Pointer to a buffer where data to write is stored in
+ * @return PTN_SUCCESS on success or error code
+ */
+static int ptn3460_write_edid(struct device *dev, u8 edid_num, u8 *data)
+{
+ int status;
+ int i;
+
+ if (edid_num > PTN_MAX_EDID_NUM)
+ return PTN_INVALID_EDID;
+
+ /* First enable access to the desired EDID table */
+ status = i2c_dev_writeb_at(dev, PTN_CONFIG_OFF + 5, edid_num);
+ if (status)
+ return (PTN_BUS_ERROR | status);
+
+ /* Now we can simply write EDID data to ptn3460 */
+ for (i = 0; i < PTN_EDID_LEN; i++) {
+ status = i2c_dev_writeb_at(dev, PTN_EDID_OFF + i, data[i]);
+ if (status)
+ return (PTN_BUS_ERROR | status);
+ }
+ return PTN_SUCCESS;
+}
+
+/**
+ * \brief This function sets up the DP2LVDS-converter to be used with the
+ * appropriate EDID data
+ * @param *dev Pointer to the I2C controller where PTN3460 is attached
+ */
+static void ptn3460_init(struct device *dev)
+{
+ struct ptn_3460_config cfg;
+ uint8_t edid_data[PTN_EDID_LEN], edid_tab, *ptr = (uint8_t *) &cfg;
+ int i, val;
+
+ /* Mainboard provides EDID data. */
+ if (mb_get_edid(edid_data) != CB_SUCCESS) {
+ printk(BIOS_ERR, "PTN3460 error: Unable to get EDID data from mainboard.\n");
+ return;
+ }
+
+ /* Mainboard decides which EDID table has to be used. */
+ edid_tab = mb_select_edid_table();
+ if (edid_tab > PTN_MAX_EDID_NUM) {
+ printk(BIOS_ERR, "PTN3460 error: invalid EDID table (%d) selected.\n",
+ edid_tab);
+ return;
+ }
+ /* Write EDID data into PTN. */
+ val = ptn3460_write_edid(dev, edid_tab, edid_data);
+ if (val != PTN_SUCCESS) {
+ printk(BIOS_ERR, "PTN3460 error: writing EDID data into device failed.\n");
+ return;
+ }
+ /* Activate the selected EDID block. */
+ ptn_select_edid(dev, edid_tab);
+ /* Read out PTN configuration data. */
+ for (i = 0; i < sizeof(struct ptn_3460_config); i++) {
+ val = i2c_dev_readb_at(dev, PTN_CONFIG_OFF + i);
+ if (val < 0) {
+ printk(BIOS_ERR,
+ "PTN3460 error: Unable to read config data from device.\n");
+ return;
+ }
+ *ptr++ = (uint8_t)val; /* fill config structure via ptr */
+ }
+ /* Mainboard can modify the configuration data.
+ Write back configuration data to PTN3460 if modified by mainboard */
+ if (mb_adjust_cfg(&cfg) == PTN_CFG_MODIFIED) {
+ ptr = (uint8_t *) &cfg;
+ for (i = 0; i < sizeof(struct ptn_3460_config); i++) {
+ val = i2c_dev_writeb_at(dev, PTN_CONFIG_OFF + i, *ptr++);
+ if (val < 0) {
+ printk(BIOS_ERR,
+ "PTN3460 error: Unable to write config data.\n");
+ return;
+ }
+ }
+ }
+}
+
+__weak enum cb_err mb_get_edid(uint8_t edid_data[0x80])
+{
+ return CB_ERR;
+}
+__weak uint8_t mb_select_edid_table(void)
+{
+ return 0;
+}
+__weak int mb_adjust_cfg(struct ptn_3460_config *cfg_ptr)
+{
+ return 0;
+}
+
+static struct device_operations ptn3460_ops = {
+ .read_resources = DEVICE_NOOP,
+ .set_resources = DEVICE_NOOP,
+ .enable_resources = DEVICE_NOOP,
+ .init = ptn3460_init,
+ .final = DEVICE_NOOP
+};
+
+static void ptn3460_enable(struct device *dev)
+{
+ dev->ops = &ptn3460_ops;
+}
+
+struct chip_operations drivers_i2c_ptn3460_ops = {
+ CHIP_NAME("PTN3460")
+ .enable_dev = ptn3460_enable
+};
diff --git a/src/drivers/i2c/ptn3460/ptn3460.h b/src/drivers/i2c/ptn3460/ptn3460.h
new file mode 100644
index 0000000000..4b9834eb9d
--- /dev/null
+++ b/src/drivers/i2c/ptn3460/ptn3460.h
@@ -0,0 +1,73 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2019 Siemens AG
+ *
+ * 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 _I2C_PTN3460_H_
+#define _I2C_PTN3460_H_
+
+#include <stdint.h>
+
+#define PTN_EDID_OFF 0x00
+#define PTN_EDID_LEN 0x80
+#define PTN_CONFIG_OFF 0x80
+#define PTN_CONFIG_LEN 0x19
+#define PTN_FLASH_CFG_OFF 0xE8
+#define PTN_FLASH_CFG_LEN 0x04
+#define PTN_MAX_EDID_NUM 6
+#define PTN_ENABLE_EMULATION (1 << 0)
+
+/* Define some error codes that can be used */
+#define PTN_SUCCESS 0x00000000
+#define PTN_CFG_MODIFIED 0x00000001
+#define PTN_BUS_ERROR 0x10000000
+#define PTN_INVALID_EDID 0x20000000
+#define PTN_INVALID_EDID_BLOCK 0x30000000
+#define PTN_ERROR 0x40000000
+
+struct ptn_3460_config {
+ u8 dp_interface_ctrl; /* DisplayPort interface control */
+ u8 lvds_interface_ctrl1; /* LVDS interface control register 1 */
+ u8 lvds_interface_ctrl2; /* LVDS interface control register 2 */
+ u8 lvds_interface_ctrl3; /* LVDS interface control register 3 */
+ u8 edid_rom_emulation; /* select which EDID-block is emulated */
+ u8 edid_rom_access_ctrl; /* select which EDID block to map to 0..0x7F */
+ u8 pwm_min[3]; /* smallest PWM frequency for back light */
+ u8 pwm_max[3]; /* biggest PWM frequency for back light */
+ u8 fast_link_ctrl; /* Fast link training control register */
+ u8 pin_cfg_ctrl1; /* Pin configuration control register 1 */
+ u8 pin_cfg_ctrl2; /* Pin configuration control register 2 */
+ u8 pwm_default; /* Default PWM bit count in DPCD register */
+ u16 pwm_value; /* Current PWM bit count in DPCD register */
+ u8 pwm_default_freq; /* Default PWM frequency in DPCD register */
+ u8 t3_timing; /* Panel T3 timing value */
+ u8 t12_timing; /* Panel T12 timing value */
+ u8 backlight_ctrl; /* Back light control register */
+ u8 t2_delay; /* Panel T2 delay */
+ u8 t4_timing; /* Panel T4 timing value */
+ u8 t5_delay; /* Panel T5 delay */
+} __packed;
+
+struct ptn_3460_flash {
+ u8 cmd; /* Flash command (erase or erase and flash) */
+ u16 magic; /* Magic number needed by the flash algorithm */
+ u8 trigger; /* Trigger for starting flash operation */
+} __packed;
+
+/* We need functions which we can call to get mainboard specific data */
+/* These functions can be implemented somewhere else but must exist. */
+extern enum cb_err mb_get_edid(uint8_t edid_data[0x80]);
+extern uint8_t mb_select_edid_table(void);
+extern int mb_adjust_cfg(struct ptn_3460_config *cfg_ptr);
+
+#endif /* _I2C_PTN3460_H_ */
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-30 12:00:08 +0000