| /* |
| * This file is part of the coreboot project. |
| * |
| * Copyright (C) 2014 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. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #include <console/console.h> |
| #include "baytrail/i2c.h" |
| #include "ptn3460.h" |
| |
| /** \brief This functions sets up the DP2LVDS-converter to be used with the |
| * appropriate lcd panel |
| * @param lcd_type Type of LCD we should set up the converter for |
| * @param *sib Pointer to short info block structure |
| * @param *eib Pointer to EDID info block structure |
| * @return 0 on success or error code |
| */ |
| int ptn3460_init(char lcd_type, struct edidinfo *eib, struct shortinfo *sib) |
| { |
| struct ptn_3460_config cfg; |
| int status; |
| |
| |
| status = i2c_init(PTN_I2C_CONTROLER); |
| if (status) |
| return (PTN_BUS_ERROR | status); |
| |
| /* If we are here, we have all the desired information for setting up */ |
| /* DP2LVDS converter. In addition, the information matches the connected */ |
| /* LCD-panel and therefore, we do not have to distinguish between */ |
| /* different panels here for the timing. Inside the converter, table 6 */ |
| /* will be used for the timings. */ |
| status = ptn3460_write_edid(6, eib->edid); |
| if (status) |
| return status; |
| /* Select this table to be emulated */ |
| ptn_select_edid(6); |
| /* Read PTN configuration data */ |
| status = i2c_read(PTN_I2C_CONTROLER, PTN_SLAVE_ADR, PTN_CONFIG_OFF, |
| (u8*)&cfg, PTN_CONFIG_LEN); |
| if (status) |
| return (PTN_BUS_ERROR | status); |
| |
| /* Set up configuration data according to the information blocks we get */ |
| cfg.dp_interface_ctrl = 0; |
| cfg.lvds_interface_ctrl1 = 0x00; |
| if (sib->panelFeatures[SIB_DISP_CON_IDX] == SIB_LVDS_DUAL_LANE) |
| cfg.lvds_interface_ctrl1 |= 0x0b; /* Turn on dual LVDS lane and clock */ |
| if ((sib->panelFeatures[SIB_HWINIT_IDX] & 0x03) == SIB_COLOR_6BIT) |
| cfg.lvds_interface_ctrl1 |= 0x20; /* Use 18 bits per pixel */ |
| |
| cfg.lvds_interface_ctrl2 = 0x03; /* no clock spreading, 300 mV LVDS swing */ |
| cfg.lvds_interface_ctrl3 = 0x00; /* no LVDS signal swap */ |
| cfg.t2_delay = 1; /* Delay T2 (VDD to LVDS active) by 16 ms */ |
| cfg.t3_timing = 5; /* 250 ms from LVDS to backlight active */ |
| cfg.t12_timing = 20; /* 1 second re-power delay */ |
| cfg.t4_timing = 3; /* 150 ms backlight off to LVDS inactive */ |
| cfg.t5_delay = 1; /* Delay T5 (LVDS to VDD inactive) by 16 ms */ |
| cfg.backlight_ctrl = 0; /* Enable backlight control */ |
| |
| /* Write back configuration data to PTN3460 */ |
| status = i2c_write(PTN_I2C_CONTROLER, PTN_SLAVE_ADR, PTN_CONFIG_OFF, |
| (u8*)&cfg, PTN_CONFIG_LEN); |
| if (status) |
| return (PTN_BUS_ERROR | status); |
| else |
| return PTN_NO_ERROR; |
| } |
| |
| /** \brief This functions reads one desired EDID data structure from PTN3460 |
| * @param edid_num Number of EDID that must be read (0..6) |
| * @param *data Pointer to a buffer where to store read data |
| * @return 0 on success or error code |
| */ |
| int ptn3460_read_edid(u8 edid_num, u8 *data) |
| { |
| int status; |
| |
| if (edid_num > PTN_MAX_EDID_NUM) |
| return PTN_INVALID_EDID; |
| /* First enable access to the desired EDID table */ |
| status = i2c_write(PTN_I2C_CONTROLER, PTN_SLAVE_ADR, PTN_CONFIG_OFF + 5, |
| &edid_num, 1); |
| if (status) |
| return (PTN_BUS_ERROR | status); |
| |
| /* Now we can simply read back EDID-data */ |
| status = i2c_read(PTN_I2C_CONTROLER, PTN_SLAVE_ADR, PTN_EDID_OFF, |
| data, PTN_EDID_LEN); |
| if (status) |
| return (PTN_BUS_ERROR | status); |
| else |
| return PTN_NO_ERROR; |
| } |
| |
| /** \brief This functions writes one EDID data structure to PTN3460 |
| * @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 0 on success or error code |
| */ |
| int ptn3460_write_edid(u8 edid_num, u8 *data) |
| { |
| int status; |
| |
| if (edid_num > PTN_MAX_EDID_NUM) |
| return PTN_INVALID_EDID; |
| /* First enable access to the desired EDID table */ |
| status = i2c_write(PTN_I2C_CONTROLER, PTN_SLAVE_ADR, PTN_CONFIG_OFF + 5, |
| &edid_num, 1); |
| if (status) |
| return (PTN_BUS_ERROR | status); |
| |
| /* Now we can simply write EDID-data to ptn3460 */ |
| status = i2c_write(PTN_I2C_CONTROLER, PTN_SLAVE_ADR, PTN_EDID_OFF, |
| data, PTN_EDID_LEN); |
| if (status) |
| return (PTN_BUS_ERROR | status); |
| else |
| return PTN_NO_ERROR; |
| } |
| |
| /** \brief This functions selects one of 7 EDID-tables inside PTN3460 |
| * which should be emulated on display port and turn emulation ON |
| * @param edid_num Number of EDID to emulate (0..6) |
| * @return 0 on success or error code |
| */ |
| int ptn_select_edid (u8 edid_num) |
| { |
| int status; |
| u8 val; |
| |
| if (edid_num > PTN_MAX_EDID_NUM) |
| return PTN_INVALID_EDID; |
| /* Enable emulation of the desired EDID table */ |
| val = (edid_num << 1) | 1; |
| status = i2c_write(PTN_I2C_CONTROLER, PTN_SLAVE_ADR, PTN_CONFIG_OFF + 4, |
| &val, 1); |
| if (status) |
| return (PTN_BUS_ERROR | status); |
| else |
| return PTN_NO_ERROR; |
| } |
| |
| /** \brief This functions performs a flash operation which will write |
| * current configuration table (all the EDID-tables and the |
| * configuration space with a total amount of 1 KByte) |
| * to the internal flash of PTN3460 |
| * @param none |
| * @return 0 on success or error code |
| */ |
| int ptn3460_flash_config(void) |
| { |
| int status; |
| struct ptn_3460_flash flash; |
| |
| flash.cmd = 0x01; /* perform erase and flash cycle */ |
| flash.magic = 0x7845; /* Magic number to protect flash operation */ |
| flash.trigger = 0x56; /* This value starts flash operation */ |
| status = i2c_write(PTN_I2C_CONTROLER, PTN_SLAVE_ADR, PTN_FLASH_CFG_OFF, |
| (u8*)&flash, PTN_FLASH_CFG_LEN); |
| if (status) { |
| return (PTN_BUS_ERROR | status); |
| } else { |
| /* To ensure the flash operation is finished, we have to wait 300 ms */ |
| mdelay(300); |
| return PTN_NO_ERROR; |
| } |
| } |