/* * 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "hda_verb.h" #include #include #include #include #include #include #include #include #include #include #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 unsigned int *mmio; static unsigned int graphics; static unsigned int physbase; void ug1(int); void ug2(int); void ug22(int); void ug3(int); /* GTT is the Global Translation Table for the graphics pipeline. * It is used to translate graphics addresses to physical * memory addresses. As in the CPU, GTTs map 4K pages. * The setgtt function adds a further bit of flexibility: * it allows you to set a range (the first two parameters) to point * to a physical address (third parameter);the physical address is * incremented by a count (fourth parameter) for each GTT in the * range. * Why do it this way? For ultrafast startup, * we can point all the GTT entries to point to one page, * and set that page to 0s: * memset(physbase, 0, 4096); * setgtt(0, 4250, physbase, 0); * this takes about 2 ms, and is a win because zeroing * the page takes a up to 200 ms. * This call sets the GTT to point to a linear range of pages * starting at physbase. */ #define GTT_PTE_BASE (2 << 20) static void setgtt(int start, int end, unsigned long base, int inc) { int i; for(i = start; i < end; i++){ u32 word = base + i*inc; /* note: we've confirmed by checking * the values that mrc does no * useful setup before we run this. */ gtt_write(GTT_PTE_BASE + i * 4, word|1); gtt_read(GTT_PTE_BASE + i * 4); } } 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 dp_init_dim_regs(struct intel_dp *dp); void dp_init_dim_regs(struct intel_dp *dp) { struct edid *edid = &(dp->edid); dp->bytes_per_pixel = edid->framebuffer_bits_per_pixel / 8; dp->stride = edid->bytes_per_line; dp->htotal = (edid->ha - 1) | ((edid->ha + edid->hbl - 1) << 16); dp->hblank = (edid->ha - 1) | ((edid->ha + edid->hbl - 1) << 16); dp->hsync = (edid->ha + edid->hso - 1) | ((edid->ha + edid->hso + edid->hspw - 1) << 16); dp->vtotal = (edid->va - 1) | ((edid->va + edid->vbl - 1) << 16); dp->vblank = (edid->va - 1) | ((edid->va + edid->vbl - 1) << 16); dp->vsync = (edid->va + edid->vso - 1) | ((edid->va + edid->vso + edid->vspw - 1) << 16); /* PIPEASRC is wid-1 x ht-1 */ dp->pipesrc = (edid->ha-1)<<16 | (edid->va-1); dp->pfa_pos = 0; dp->pfa_ctl = 0x80800000; dp->pfa_sz = (edid->ha << 16) | (edid->va); dp->flags = intel_ddi_calc_transcoder_flags(3 * 6, /* bits per color is 6 */ dp->port, dp->pipe, dp->type, dp->lane_count, dp->pfa_sz, dp->edid.phsync == '+'?1:0, dp->edid.pvsync == '+'?1:0); dp->transcoder = intel_ddi_get_transcoder(dp->port, dp->pipe); intel_dp_compute_m_n(dp->pipe_bits_per_pixel, dp->lane_count, dp->edid.pixel_clock, dp->edid.link_clock, &dp->m_n); printk(BIOS_SPEW, "dp->stride = 0x%08x\n",dp->stride); printk(BIOS_SPEW, "dp->htotal = 0x%08x\n", dp->htotal); printk(BIOS_SPEW, "dp->hblank = 0x%08x\n", dp->hblank); printk(BIOS_SPEW, "dp->hsync = 0x%08x\n", dp->hsync); printk(BIOS_SPEW, "dp->vtotal = 0x%08x\n", dp->vtotal); printk(BIOS_SPEW, "dp->vblank = 0x%08x\n", dp->vblank); printk(BIOS_SPEW, "dp->vsync = 0x%08x\n", dp->vsync); printk(BIOS_SPEW, "dp->pipesrc = 0x%08x\n", dp->pipesrc); printk(BIOS_SPEW, "dp->pfa_pos = 0x%08x\n", dp->pfa_pos); printk(BIOS_SPEW, "dp->pfa_ctl = 0x%08x\n", dp->pfa_ctl); printk(BIOS_SPEW, "dp->pfa_sz = 0x%08x\n", dp->pfa_sz); printk(BIOS_SPEW, "dp->link_m = 0x%08x\n", dp->m_n.link_m); printk(BIOS_SPEW, "dp->link_n = 0x%08x\n", dp->m_n.link_n); printk(BIOS_SPEW, "0x6f030 = 0x%08x\n", TU_SIZE(dp->m_n.tu) | dp->m_n.gmch_m); printk(BIOS_SPEW, "0x6f030 = 0x%08x\n", dp->m_n.gmch_m); printk(BIOS_SPEW, "0x6f034 = 0x%08x\n", dp->m_n.gmch_n); printk(BIOS_SPEW, "dp->flags = 0x%08x\n", dp->flags); } int intel_dp_bw_code_to_link_rate(u8 link_bw); int intel_dp_bw_code_to_link_rate(u8 link_bw) { switch (link_bw) { case DP_LINK_BW_1_62: default: return 162000; case DP_LINK_BW_2_7: return 270000; case DP_LINK_BW_5_4: return 540000; } } 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(DP_A, DP_PORT_EN | DP_LINK_TRAIN_PAT_1 | DP_LINK_TRAIN_PAT_1_CPT | DP_VOLTAGE_0_4 | DP_PRE_EMPHASIS_0 | DP_PORT_WIDTH_1 | DP_PLL_FREQ_270MHZ | DP_SYNC_VS_HIGH |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_get_lane_count(intel_dp, &read_val); 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); } #define TEST_GFX 0 #if TEST_GFX static void test_gfx(struct intel_dp *dp) { int i; /* 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*)(graphics + i * dp->stride + j * sizeof(tcolor)); memcpy(l,&tcolor,sizeof(tcolor)); } } } #else static void test_gfx(struct intel_dp *dp) {} #endif 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 i915lightup(unsigned int pphysbase, unsigned int pmmio, unsigned int pgfx, unsigned int init_fb) { int must_cycle_power = 0; struct intel_dp adp, *dp = &adp; int i; int edid_ok; int pixels = FRAME_BUFFER_BYTES/64; mmio = (void *)pmmio; physbase = pphysbase; graphics = pgfx; printk(BIOS_SPEW, "i915lightup: graphics %p mmio %p" "physbase %08x\n", (void *)graphics, mmio, physbase); void runio(struct intel_dp *dp); void runlinux(struct intel_dp *dp); dp->gen = 8; // This is gen 8 which we believe is Haswell dp->is_haswell = 1; dp->DP = 0x2; /* These values are used for training the link */ dp->lane_count = 2; dp->link_bw = DP_LINK_BW_2_7; dp->panel_power_down_delay = 600; dp->panel_power_up_delay = 200; dp->panel_power_cycle_delay = 600; dp->pipe = PIPE_A; dp->port = PORT_A; dp->plane = PLANE_A; dp->clock = 160000; dp->pipe_bits_per_pixel = 32; 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: We do not zero out all the pages pointed to by GTT in order to avoid wasting time */ if (init_fb) setgtt(0, FRAME_BUFFER_PAGES, physbase, 4096); else { setgtt(0, FRAME_BUFFER_PAGES, physbase, 0); memset((void*)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); dp->edid.link_clock = intel_dp_bw_code_to_link_rate(dp->link_bw); printk(BIOS_SPEW, "pixel_clock is %i, link_clock is %i\n",dp->edid.pixel_clock, dp->edid.link_clock); dp_init_dim_regs(dp); 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, graphics); i915_init_done = 1; return i915_init_done; fail: printk(BIOS_SPEW, "Graphics could not be started;"); if (0 && must_cycle_power){ 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; }