summaryrefslogtreecommitdiff
path: root/src/drivers/intel/gma
diff options
context:
space:
mode:
authorVladimir Serbinenko <phcoder@gmail.com>2014-02-21 07:21:00 +0100
committerVladimir Serbinenko <phcoder@gmail.com>2014-03-04 00:40:50 +0100
commit1b12ef1ac3bb45a315622dd82d16d3397a74d56f (patch)
tree352ef0478ab4ce136a22583383c495faed6fc1ee /src/drivers/intel/gma
parent42c4a9df29528ab456da4c0a643816cb81d10610 (diff)
drivers/intel/gma: Add EDID retrieving functions.
Change-Id: I64f2fcc5ad52d6a0188d02b28769001ada718c4f Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com> Reviewed-on: http://review.coreboot.org/5278 Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com> Tested-by: build bot (Jenkins)
Diffstat (limited to 'src/drivers/intel/gma')
-rw-r--r--src/drivers/intel/gma/Kconfig4
-rw-r--r--src/drivers/intel/gma/Makefile.inc2
-rw-r--r--src/drivers/intel/gma/edid.c80
-rw-r--r--src/drivers/intel/gma/edid.h1
4 files changed, 86 insertions, 1 deletions
diff --git a/src/drivers/intel/gma/Kconfig b/src/drivers/intel/gma/Kconfig
index 073f70819b..e26c297a09 100644
--- a/src/drivers/intel/gma/Kconfig
+++ b/src/drivers/intel/gma/Kconfig
@@ -28,3 +28,7 @@ config INTEL_DDI
default n
help
helper functions for intel DDI operations
+
+config INTEL_EDID
+ bool
+ default n
diff --git a/src/drivers/intel/gma/Makefile.inc b/src/drivers/intel/gma/Makefile.inc
index 0c3f45a17e..bea597e16b 100644
--- a/src/drivers/intel/gma/Makefile.inc
+++ b/src/drivers/intel/gma/Makefile.inc
@@ -19,4 +19,4 @@
ramstage-$(CONFIG_INTEL_DP) += intel_dp.c drm_dp_helper.c
ramstage-$(CONFIG_INTEL_DDI) += intel_ddi.c
-
+ramstage-$(CONFIG_INTEL_EDID) += edid.c
diff --git a/src/drivers/intel/gma/edid.c b/src/drivers/intel/gma/edid.c
new file mode 100644
index 0000000000..91ad7428ce
--- /dev/null
+++ b/src/drivers/intel/gma/edid.c
@@ -0,0 +1,80 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2014 Vladimir Serbinenko <phcoder@gmail.com>
+ *
+ * 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, or (at your option)
+ * any later verion 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 <arch/io.h>
+#include <console/console.h>
+#include <delay.h>
+
+#include "i915_reg.h"
+#include "edid.h"
+
+static void wait_rdy(u32 mmio)
+{
+ unsigned try = 100;
+
+ while (try--) {
+ if (read32(mmio + 8) & (1 << 11))
+ return;
+ udelay(10);
+ }
+}
+
+void intel_gmbus_read_edid(u32 mmio, u8 bus, u8 slave, u8 *edid, u32 edid_size)
+{
+ int i;
+
+ slave &= 0x7f;
+ edid_size &= 0x1fc;
+
+ wait_rdy(mmio);
+ /* 100 KHz, hold 0ns, */
+ write32(mmio + 4 * 0, bus);
+ wait_rdy(mmio);
+ /* Ensure index bits are disabled. */
+ write32(mmio + 4 * 5, 0);
+ write32(mmio + 4 * 1, 0x46000000 | (slave << 1));
+ wait_rdy(mmio);
+ /* Ensure index bits are disabled. */
+ write32(mmio + 4 * 5, 0);
+ write32(mmio + 4 * 1, 0x4a000001 | (slave << 1)
+ | (edid_size << 16));
+ for (i = 0; i < edid_size / 4; i++) {
+ u32 reg32;
+ wait_rdy(mmio);
+ reg32 = read32(mmio + 4 * 3);
+ edid[4 * i] = reg32 & 0xff;
+ edid[4 * i + 1] = (reg32 >> 8) & 0xff;
+ edid[4 * i + 2] = (reg32 >> 16) & 0xff;
+ edid[4 * i + 3] = (reg32 >> 24) & 0xff;
+ }
+ wait_rdy(mmio);
+ write32(mmio + 4 * 1, 0x4a800000 | (slave << 1));
+ wait_rdy(mmio);
+ write32(mmio + 4 * 0, 0x48000000);
+ write32(mmio + 4 * 2, 0x00008000);
+
+ printk (BIOS_SPEW, "EDID:\n");
+ for (i = 0; i < 128; i++) {
+ printk (BIOS_SPEW, "%02x ", edid[i]);
+ if ((i & 0xf) == 0xf)
+ printk (BIOS_SPEW, "\n");
+ }
+}
diff --git a/src/drivers/intel/gma/edid.h b/src/drivers/intel/gma/edid.h
new file mode 100644
index 0000000000..cb54b46f03
--- /dev/null
+++ b/src/drivers/intel/gma/edid.h
@@ -0,0 +1 @@
+void intel_gmbus_read_edid(u32 gmbus_mmio, u8 bus, u8 slave, u8 *edid, u32 edid_size);