| /* |
| * This file is part of the coreboot project. |
| * |
| * Copyright 2014 Google 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. |
| * |
| * 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 <arch/io.h> |
| #include <stdint.h> |
| #include <lib.h> |
| #include <stdlib.h> |
| #include <delay.h> |
| #include <soc/addressmap.h> |
| #include <soc/clock.h> |
| #include <device/device.h> |
| #include <soc/nvidia/tegra/types.h> |
| #include <soc/display.h> |
| #include <soc/mipi_dsi.h> |
| #include <soc/tegra_dsi.h> |
| #include "jdi_25x18_display/panel-jdi-lpm102a188a.h" |
| |
| static unsigned long dsi_pads[] = { |
| 0x060, /* DSIA & DSIB pads */ |
| 0x180, /* DSIC & DSID pads */ |
| }; |
| |
| static struct tegra_mipi mipi_data = { |
| .regs = (void *)TEGRA_MIPI_CAL_BASE, |
| }; |
| |
| static inline unsigned long tegra_mipi_readl(struct tegra_mipi *mipi, |
| unsigned long reg) |
| { |
| return readl(mipi->regs + (reg << 2)); |
| } |
| |
| static inline void tegra_mipi_writel(struct tegra_mipi *mipi, |
| unsigned long value, unsigned long reg) |
| { |
| writel(value, mipi->regs + (reg << 2)); |
| } |
| |
| static const struct calibration_regs tegra124_mipi_calibration_regs[] = { |
| { .data = MIPI_CAL_CONFIG_CSIA, .clk = MIPI_CAL_CONFIG_CSIAB_CLK }, |
| { .data = MIPI_CAL_CONFIG_CSIB, .clk = MIPI_CAL_CONFIG_CSIAB_CLK }, |
| { .data = MIPI_CAL_CONFIG_CSIC, .clk = MIPI_CAL_CONFIG_CSICD_CLK }, |
| { .data = MIPI_CAL_CONFIG_CSID, .clk = MIPI_CAL_CONFIG_CSICD_CLK }, |
| { .data = MIPI_CAL_CONFIG_CSIE, .clk = MIPI_CAL_CONFIG_CSIE_CLK }, |
| { .data = MIPI_CAL_CONFIG_DSIA, .clk = MIPI_CAL_CONFIG_DSIAB_CLK }, |
| { .data = MIPI_CAL_CONFIG_DSIB, .clk = MIPI_CAL_CONFIG_DSIAB_CLK }, |
| }; |
| static const struct tegra_mipi_config tegra124_mipi_config = { |
| .calibrate_clk_lane = 1, |
| .regs = tegra124_mipi_calibration_regs, |
| .num_pads = ARRAY_SIZE(tegra124_mipi_calibration_regs), |
| }; |
| |
| struct tegra_mipi_device *tegra_mipi_request(struct tegra_mipi_device *device, |
| int device_index) |
| { |
| device->mipi = &mipi_data; |
| device->config = &tegra124_mipi_config; |
| device->pads = dsi_pads[device_index]; |
| |
| return device; |
| } |
| |
| static int tegra_mipi_wait(struct tegra_mipi *mipi) |
| { |
| u32 poll_interval_us = 1000; |
| u32 timeout_us = 250 * 1000; |
| unsigned long value; |
| |
| do { |
| value = tegra_mipi_readl(mipi, MIPI_CAL_STATUS); |
| if ((value & MIPI_CAL_STATUS_ACTIVE) == 0 && |
| (value & MIPI_CAL_STATUS_DONE) != 0) |
| return 0; |
| |
| if (timeout_us > poll_interval_us) |
| timeout_us -= poll_interval_us; |
| else |
| break; |
| |
| udelay(poll_interval_us); |
| } while (1); |
| |
| printk(BIOS_ERR, "%s: ERROR: timeout\n", __func__); |
| return -ETIMEDOUT; |
| } |
| |
| int tegra_mipi_calibrate(struct tegra_mipi_device *device) |
| { |
| const struct tegra_mipi_config *cfg = device->config; |
| unsigned long value, clk_value; |
| unsigned int i; |
| int err; |
| |
| value = tegra_mipi_readl(device->mipi, MIPI_CAL_BIAS_PAD_CFG0); |
| value &= ~MIPI_CAL_BIAS_PAD_PDVCLAMP; |
| value |= MIPI_CAL_BIAS_PAD_E_VCLAMP_REF; |
| tegra_mipi_writel(device->mipi, value, MIPI_CAL_BIAS_PAD_CFG0); |
| |
| tegra_mipi_writel(device->mipi, MIPI_CAL_BIAS_PAD_CFG1_DEFAULT, |
| MIPI_CAL_BIAS_PAD_CFG1); |
| |
| value = tegra_mipi_readl(device->mipi, MIPI_CAL_BIAS_PAD_CFG2); |
| value &= ~MIPI_CAL_BIAS_PAD_PDVREG; |
| tegra_mipi_writel(device->mipi, value, MIPI_CAL_BIAS_PAD_CFG2); |
| |
| for (i = 0; i < cfg->num_pads; i++) { |
| if (device->pads & BIT(i)) { |
| value = MIPI_CAL_CONFIG_SELECT | |
| MIPI_CAL_CONFIG_HSPDOS(0) | |
| MIPI_CAL_CONFIG_HSPUOS(4) | |
| MIPI_CAL_CONFIG_TERMOS(5); |
| clk_value = MIPI_CAL_CONFIG_SELECT | |
| MIPI_CAL_CONFIG_HSCLKPDOSD(0) | |
| MIPI_CAL_CONFIG_HSCLKPUOSD(4); |
| } else { |
| value = 0; |
| clk_value = 0; |
| } |
| |
| tegra_mipi_writel(device->mipi, value, cfg->regs[i].data); |
| |
| if (cfg->calibrate_clk_lane) |
| tegra_mipi_writel(device->mipi, clk_value, |
| cfg->regs[i].clk); |
| } |
| |
| value = tegra_mipi_readl(device->mipi, MIPI_CAL_CTRL); |
| value |= MIPI_CAL_CTRL_START; |
| tegra_mipi_writel(device->mipi, value, MIPI_CAL_CTRL); |
| |
| err = tegra_mipi_wait(device->mipi); |
| |
| return err; |
| } |