diff options
Diffstat (limited to 'src/soc/nvidia/tegra210/mipi.c')
| -rw-r--r-- | src/soc/nvidia/tegra210/mipi.c | 204 |
1 files changed, 204 insertions, 0 deletions
diff --git a/src/soc/nvidia/tegra210/mipi.c b/src/soc/nvidia/tegra210/mipi.c new file mode 100644 index 0000000000..003530883c --- /dev/null +++ b/src/soc/nvidia/tegra210/mipi.c @@ -0,0 +1,204 @@ +/* + * 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. + */ +#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[] = { + 0x0c0, /* DSIA channel A & B pads */ + 0x300, /* DSIB channel A & B 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 read32(mipi->regs + (reg << 2)); +} + +static inline void tegra_mipi_writel(struct tegra_mipi *mipi, + unsigned long value, unsigned long reg) +{ + write32(mipi->regs + (reg << 2), value); +} + +static const struct tegra_mipi_pad tegra210_mipi_pads[] = { + { .data = MIPI_CAL_CONFIG_CSIA, .clk = 0 }, + { .data = MIPI_CAL_CONFIG_CSIB, .clk = 0 }, + { .data = MIPI_CAL_CONFIG_CSIC, .clk = 0 }, + { .data = MIPI_CAL_CONFIG_CSID, .clk = 0 }, + { .data = MIPI_CAL_CONFIG_CSIE, .clk = 0 }, + { .data = MIPI_CAL_CONFIG_CSIF, .clk = 0 }, + { .data = MIPI_CAL_CONFIG_DSIA, .clk = MIPI_CAL_CONFIG_DSIA_CLK }, + { .data = MIPI_CAL_CONFIG_DSIB, .clk = MIPI_CAL_CONFIG_DSIB_CLK }, + { .data = MIPI_CAL_CONFIG_DSIC, .clk = MIPI_CAL_CONFIG_DSIC_CLK }, + { .data = MIPI_CAL_CONFIG_DSID, .clk = MIPI_CAL_CONFIG_DSID_CLK }, +}; + +static const struct tegra_mipi_soc tegra210_mipi_soc = { + .has_clk_lane = 1, + .pads = tegra210_mipi_pads, + .num_pads = ARRAY_SIZE(tegra210_mipi_pads), + .clock_enable_override = 1, + .needs_vclamp_ref = 0, + .pad_drive_down_ref = 0x0, + .pad_drive_up_ref = 0x3, + .pad_vclamp_level = 0x1, + .pad_vauxp_level = 0x1, + .hspdos = 0x0, + .hspuos = 0x2, + .termos = 0x0, + .hsclkpdos = 0x0, + .hsclkpuos = 0x2, +}; + +struct tegra_mipi_device *tegra_mipi_request(struct tegra_mipi_device *device, + int device_index) +{ + device->mipi = &mipi_data; + device->mipi->soc = &tegra210_mipi_soc; + 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_soc *soc = device->mipi->soc; + unsigned int i; + u32 value; + int err; + + value = tegra_mipi_readl(device->mipi, MIPI_CAL_BIAS_PAD_CFG0); + value &= ~MIPI_CAL_BIAS_PAD_PDVCLAMP; + + if (soc->needs_vclamp_ref) + value |= MIPI_CAL_BIAS_PAD_E_VCLAMP_REF; + + tegra_mipi_writel(device->mipi, value, MIPI_CAL_BIAS_PAD_CFG0); + + value = MIPI_CAL_BIAS_PAD_DRV_DN_REF(soc->pad_drive_down_ref) | + MIPI_CAL_BIAS_PAD_DRV_UP_REF(soc->pad_drive_up_ref); + tegra_mipi_writel(device->mipi, value, 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); + + value = tegra_mipi_readl(device->mipi, MIPI_CAL_BIAS_PAD_CFG2); + value &= ~MIPI_CAL_BIAS_PAD_VCLAMP(0x7); + value &= ~MIPI_CAL_BIAS_PAD_VAUXP(0x7); + value |= MIPI_CAL_BIAS_PAD_VCLAMP(soc->pad_vclamp_level); + value |= MIPI_CAL_BIAS_PAD_VAUXP(soc->pad_vauxp_level); + tegra_mipi_writel(device->mipi, value, MIPI_CAL_BIAS_PAD_CFG2); + + for (i = 0; i < soc->num_pads; i++) { + u32 clk = 0, data = 0; + + if (device->pads & BIT(i)) { + data = MIPI_CAL_CONFIG_SELECT | + MIPI_CAL_CONFIG_HSPDOS(soc->hspdos) | + MIPI_CAL_CONFIG_HSPUOS(soc->hspuos) | + MIPI_CAL_CONFIG_TERMOS(soc->termos); + clk = MIPI_CAL_CONFIG_SELECT | + MIPI_CAL_CONFIG_HSCLKPDOSD(soc->hsclkpdos) | + MIPI_CAL_CONFIG_HSCLKPUOSD(soc->hsclkpuos); + } + + tegra_mipi_writel(device->mipi, data, soc->pads[i].data); + + if (soc->has_clk_lane && soc->pads[i].clk != 0) + tegra_mipi_writel(device->mipi, clk, soc->pads[i].clk); + } + + value = tegra_mipi_readl(device->mipi, MIPI_CAL_CTRL); + value &= ~MIPI_CAL_CTRL_NOISE_FILTER(0xf); + value &= ~MIPI_CAL_CTRL_PRESCALE(0x3); + value |= MIPI_CAL_CTRL_NOISE_FILTER(0xa); + value |= MIPI_CAL_CTRL_PRESCALE(0x2); + + if (!soc->clock_enable_override) + value &= ~MIPI_CAL_CTRL_CLKEN_OVR; + else + value |= MIPI_CAL_CTRL_CLKEN_OVR; + + tegra_mipi_writel(device->mipi, value, MIPI_CAL_CTRL); + + /* clear any pending status bits */ + value = tegra_mipi_readl(device->mipi, MIPI_CAL_STATUS); + tegra_mipi_writel(device->mipi, value, MIPI_CAL_STATUS); + + 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); + if (err < 0) + printk(BIOS_ERR, "failed to calibrate MIPI pads: %d\n", err); + else + printk(BIOS_INFO, "MIPI calibration done\n"); + + value = tegra_mipi_readl(device->mipi, MIPI_CAL_BIAS_PAD_CFG0); + + if (soc->needs_vclamp_ref) + value &= ~MIPI_CAL_BIAS_PAD_E_VCLAMP_REF; + + value |= MIPI_CAL_BIAS_PAD_PDVCLAMP; + tegra_mipi_writel(device->mipi, value, MIPI_CAL_BIAS_PAD_CFG0); + + return err; +} |