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Diffstat (limited to 'src/mainboard/google/auron/gma.c')
| -rw-r--r-- | src/mainboard/google/auron/gma.c | 276 |
1 files changed, 276 insertions, 0 deletions
diff --git a/src/mainboard/google/auron/gma.c b/src/mainboard/google/auron/gma.c new file mode 100644 index 0000000000..735ad65f9e --- /dev/null +++ b/src/mainboard/google/auron/gma.c @@ -0,0 +1,276 @@ +/* + * This file is part of the coreboot project. + * + * Copyright 2013 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 <types.h> +#include <string.h> +#include <stdlib.h> +#include <device/device.h> +#include <device/device.h> +#include <device/pci_def.h> +#include <device/pci_ops.h> +#include <console/console.h> +#include <delay.h> +#include <pc80/mc146818rtc.h> +#include <arch/acpi.h> +#include <arch/io.h> +#include <arch/interrupt.h> +#include <boot/coreboot_tables.h> +#include <smbios.h> +#include <device/pci.h> +#include <ec/google/chromeec/ec.h> + +#include <cpu/x86/tsc.h> +#include <cpu/x86/cache.h> +#include <cpu/x86/mtrr.h> +#include <cpu/x86/msr.h> +#include <edid.h> +#include <drivers/intel/gma/i915.h> +#include <northbridge/intel/haswell/haswell.h> +#include "mainboard.h" + +/* + * Here is the rough outline of how we bring up the display: + * 1. Upon power-on Sink generates a hot plug detection pulse thru HPD + * 2. Source determines video mode by reading DPCD receiver capability field + * (DPCD 00000h to 0000Dh) including eDP CP capability register (DPCD + * 0000Dh). + * 3. Sink replies DPCD receiver capability field. + * 4. Source starts EDID read thru I2C-over-AUX. + * 5. Sink replies EDID thru I2C-over-AUX. + * 6. Source determines link configuration, such as MAX_LINK_RATE and + * MAX_LANE_COUNT. Source also determines which type of eDP Authentication + * method to use and writes DPCD link configuration field (DPCD 00100h to + * 0010Ah) including eDP configuration set (DPCD 0010Ah). + * 7. Source starts link training. Sink does clock recovery and equalization. + * 8. Source reads DPCD link status field (DPCD 00200h to 0020Bh). + * 9. Sink replies DPCD link status field. If main link is not stable, Source + * repeats Step 7. + * 10. Source sends MSA (Main Stream Attribute) data. Sink extracts video + * parameters and recovers stream clock. + * 11. Source sends video data. + */ + +/* how many bytes do we need for the framebuffer? + * Well, this gets messy. To get an exact answer, we have + * to ask the panel, but we'd rather zero the memory + * and set up the gtt while the panel powers up. So, + * we take a reasonable guess, secure in the knowledge that the + * MRC has to overestimate the number of bytes used. + * 8 MiB is a very safe guess. There may be a better way later, but + * fact is, the initial framebuffer is only very temporary. And taking + * a little long is ok; this is done much faster than the AUX + * channel is ready for IO. + */ +#define FRAME_BUFFER_BYTES (8*MiB) +/* how many 4096-byte pages do we need for the framebuffer? + * There are hard ways to get this, and easy ways: + * there are FRAME_BUFFER_BYTES/4096 pages, since pages are 4096 + * on this chip (and in fact every Intel graphics chip we've seen). + */ +#define FRAME_BUFFER_PAGES (FRAME_BUFFER_BYTES/(4096)) + + +static int i915_init_done = 0; + +/* fill the palette. */ +static void palette(void) +{ + int i; + unsigned long color = 0; + + for(i = 0; i < 256; i++, color += 0x010101){ + gtt_write(_LGC_PALETTE_A + (i<<2),color); + } +} + +void mainboard_train_link(struct intel_dp *intel_dp) +{ + u8 read_val; + u8 link_status[DP_LINK_STATUS_SIZE]; + + gtt_write(DP_TP_CTL(intel_dp->port), + DP_TP_CTL_ENABLE | DP_TP_CTL_ENHANCED_FRAME_ENABLE); + gtt_write(DDI_BUF_CTL_A, + DDI_BUF_CTL_ENABLE| + DDI_A_4_LANES|DDI_PORT_WIDTH_X1|DDI_INIT_DISPLAY_DETECTED|0x80000011); + + intel_dp_get_training_pattern(intel_dp, &read_val); + intel_dp_set_training_pattern(intel_dp, + DP_TRAINING_PATTERN_1 | DP_LINK_QUAL_PATTERN_DISABLE | + DP_SYMBOL_ERROR_COUNT_BOTH); + + intel_dp_set_training_lane0(intel_dp, + DP_TRAIN_VOLTAGE_SWING_400 | DP_TRAIN_PRE_EMPHASIS_0); + intel_dp_get_link_status(intel_dp, link_status); + + gtt_write(DP_TP_CTL(intel_dp->port), + DP_TP_CTL_ENABLE | + DP_TP_CTL_ENHANCED_FRAME_ENABLE | DP_TP_CTL_LINK_TRAIN_PAT2); + + intel_dp_get_training_pattern(intel_dp, &read_val); + intel_dp_set_training_pattern(intel_dp, DP_TRAINING_PATTERN_2 | + DP_LINK_QUAL_PATTERN_DISABLE | DP_SYMBOL_ERROR_COUNT_BOTH); + intel_dp_get_link_status(intel_dp, link_status); + intel_dp_get_lane_align_status(intel_dp, &read_val); + intel_dp_get_training_pattern(intel_dp, &read_val); + intel_dp_set_training_pattern(intel_dp, DP_TRAINING_PATTERN_DISABLE | + DP_LINK_QUAL_PATTERN_DISABLE | DP_SYMBOL_ERROR_COUNT_BOTH); +} + +/* This variable controls whether the test_gfx function below puts up + * color bars or not. In previous revs we ifdef'd the test_gfx function out + * but it's handy, especially when using a JTAG debugger + * to be able to enable and disable a test graphics. + */ +int show_test = 0; + +static void test_gfx(struct intel_dp *dp) +{ + int i; + + if (!show_test) + return; + /* This is a sanity test code which fills the screen with two bands -- + green and blue. It is very useful to ensure all the initializations + are made right. Thus, to be used only for testing, not otherwise + */ + + for (i = 0; i < (dp->edid.va - 4); i++) { + u32 *l; + int j; + u32 tcolor = 0x0ff; + for (j = 0; j < (dp->edid.ha-4); j++) { + if (j == (dp->edid.ha/2)) { + tcolor = 0xff00; + } + l = (u32*)(dp->graphics + i * dp->stride + j * sizeof(tcolor)); + memcpy(l,&tcolor,sizeof(tcolor)); + } + } + printk(BIOS_SPEW, "sleep 10\n"); + delay(10); +} + +void mainboard_set_port_clk_dp(struct intel_dp *intel_dp) +{ + u32 ddi_pll_sel = 0; + + switch (intel_dp->link_bw) { + case DP_LINK_BW_1_62: + ddi_pll_sel = PORT_CLK_SEL_LCPLL_810; + break; + case DP_LINK_BW_2_7: + ddi_pll_sel = PORT_CLK_SEL_LCPLL_1350; + break; + case DP_LINK_BW_5_4: + ddi_pll_sel = PORT_CLK_SEL_LCPLL_2700; + break; + default: + printk(BIOS_ERR, "invalid link bw %d\n", intel_dp->link_bw); + return; + } + + gtt_write(PORT_CLK_SEL(intel_dp->port), ddi_pll_sel); +} + +int panel_lightup(struct intel_dp *dp, unsigned int init_fb) +{ + int i; + int edid_ok; + int pixels = FRAME_BUFFER_BYTES/64; + + gtt_write(PCH_PP_CONTROL,0xabcd000f); + delay(1); + + void runio(struct intel_dp *dp); + /* hard codes -- stuff you can only know from the mainboard */ + dp->gen = 8; // This is gen 8 which we believe is Haswell + dp->is_haswell = 1; + dp->DP = 0x2; + dp->pipe = PIPE_A; + dp->port = PORT_A; + dp->plane = PLANE_A; + dp->pipe_bits_per_pixel = 24; + dp->type = INTEL_OUTPUT_EDP; + dp->output_reg = DP_A; + /* observed from YABEL. */ + dp->aux_clock_divider = 0xe1; + dp->precharge = 3; + + /* 1. Normal mode: Set the first page to zero and make + all GTT entries point to the same page + 2. Developer/Recovery mode: Set up a tasteful color + so people know we are alive. */ + if (init_fb || show_test) { + set_translation_table(0, FRAME_BUFFER_PAGES, dp->physbase, + 4096); + memset((void *)dp->graphics, 0x55, FRAME_BUFFER_PAGES*4096); + } else { + set_translation_table(0, FRAME_BUFFER_PAGES, dp->physbase, 0); + memset((void*)dp->graphics, 0, 4096); + } + + dp->address = 0x50; + + if ( !intel_dp_get_dpcd(dp) ) + goto fail; + + intel_dp_i2c_aux_ch(dp, MODE_I2C_WRITE, 0, NULL); + for(dp->edidlen = i = 0; i < sizeof(dp->rawedid); i++){ + if (intel_dp_i2c_aux_ch(dp, MODE_I2C_READ, + 0x50, &dp->rawedid[i]) < 0) + break; + dp->edidlen++; + } + + edid_ok = decode_edid(dp->rawedid, dp->edidlen, &dp->edid); + + printk(BIOS_SPEW, "decode edid returns %d\n", edid_ok); + + compute_display_params(dp); + + printk(BIOS_SPEW, "pixel_clock is %i, link_clock is %i\n", + dp->edid.pixel_clock, dp->edid.link_clock); + + intel_ddi_set_pipe_settings(dp); + + runio(dp); + + palette(); + + pixels = dp->edid.ha * (dp->edid.va-4) * 4; + printk(BIOS_SPEW, "ha=%d, va=%d\n",dp->edid.ha, dp->edid.va); + test_gfx(dp); + + set_vbe_mode_info_valid(&dp->edid, (uintptr_t)dp->graphics); + i915_init_done = 1; + return 1; + +fail: + printk(BIOS_SPEW, "Graphics could not be started;"); + /* unclear we will *ever* want to do this. */ + if (0){ + printk(BIOS_SPEW, "Turn off power and wait ..."); + gtt_write(PCH_PP_CONTROL,0xabcd0000); + udelay(600000); + gtt_write(PCH_PP_CONTROL,0xabcd000f); + } + printk(BIOS_SPEW, "Returning.\n"); + return 0; +} |