Patch set updated for coreboot: e05228c samsung/exynos5: add resource functions for the display port

[Ronald G. Minnich]

Ronald G. Minnich ([e-mail]) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/2615

-gerrit

commit e05228c2a7acb2200b13df8fdf6a9bd7210ab6ab
Author: Ronald G. Minnich 
Date:   Mon Mar 18 09:49:54 2013 -0700

samsung/exynos5: add resource functions for the display port

NOT WORKING.

We're still not getting our ops set -- seems the enable function
    is not being called, sigh.

Simplified devicetree.cb however.

Not working, seemingly, but we need to add a 4M resource for
    memory, and it seems it needs to be fixed at the address shown.
    This address was chosen from current hardware.

The pnp device in the displayport is really hokey. We're going to
    have to create a new kind of device, maybe called 'hardwired', or
    something, to allow us to wire down devices we know are there without
    probing. Discussion on IRC implies this is the direction we need to go.

Change-Id: Ied65a554f833566be817540702f79a02e7b6cb6e
    Signed-off-by: Ronald G. Minnich 
---
 .../exynos5-common/displayport/displayport.c       | 44 ++++++++++++++++++----
 src/mainboard/google/snow/devicetree.cb            |  7 +---
 2 files changed, 38 insertions(+), 13 deletions(-)

diff --git a/src/cpu/samsung/exynos5-common/displayport/displayport.c b/src/cpu/samsung/exynos5-common/displayport/displayport.c
index 1c08bc7..8609828 100644
--- a/src/cpu/samsung/exynos5-common/displayport/displayport.c
+++ b/src/cpu/samsung/exynos5-common/displayport/displayport.c
@@ -19,6 +19,7 @@

#include <stdlib.h>
 #include <string.h>
+#include <stddef.h>
 #include <delay.h>
 #include <arch/io.h>
 #include <device/device.h>
@@ -28,7 +29,7 @@
  * and easier to understand and debug we explicitly name this common case. The alternate
  * approach, involving lots of machine and callbacks, is hard to debug and verify.
  */
-static void exynos_displayport_init(void)
+static void exynos_displayport_init(device_t dev)
 {
    struct cpu_samsung_exynos5_common_displayport_config *conf = dev->chip_info;
    /* put these on the stack. If, at some point, we want to move this code to a
@@ -83,22 +84,51 @@ static void exynos_displayport_init(void)
 #endif
 }

-static void exynos_displayport_noop(device_t dummy)
+static void exynos_displayport_read_resources(device_t dev)
 {
+	struct cpu_samsung_exynos5_common_displayport_config *conf = dev->chip_info;
+        struct resource *resource;
+	printk(BIOS_SPEW, "%s: dev %p\n", __func__, dev);
+	exynos_displayport_init(dev);
+	/* claim a resource for the UMA graphics.
+	 * Follow the current convention of starting at 24M
+	 * from the start.
+	 */
+	resource = new_resource(dev, 0);
+	/* this is a hardcode for now. There's some real confusion about what it
+	 * needs to be, docs are not helping, and hardware on real systems
+	 * has settings we don't understand. FIXME.
+	 */
+	resource->base = 0x20000000 + 24*MiB;
+	resource->size = conf->xres * conf->yres * 4; /* 4 bytes per pixel for RGB */
+	resource->flags = IORESOURCE_MEM | IORESOURCE_FIXED | IORESOURCE_STORED | IORESOURCE_ASSIGNED;
+	printk(BIOS_DEBUG, "Adding graphics at %p, size %08lx\n", (void *)resource->base, resource->size);
+}
+
+static void exynos_displayport_set_resources(device_t dev)
+{
+	printk(BIOS_SPEW, "%s: dev %p\n", __function__, dev);
+}
+
+static void exynos_displayport_enable_resources(device_t dev)
+{
+	printk(BIOS_SPEW, "%s: dev %p\n", __function__, dev);
 }

static struct device_operations exynos_displayport_operations  = {
-	.read_resources   = exynos_displayport_noop,
-	.set_resources    = exynos_displayport_noop,
-	.enable_resources = exynos_displayport_noop,
+	.read_resources   = exynos_displayport_read_resources,
+	.set_resources    = exynos_displayport_set_resources,
+	.enable_resources = exynos_displayport_enable_resources,
    .init		  = exynos_displayport_init,
    .scan_bus	  = exynos_displayport_noop,
 };

static void exynos_displayport_enable(struct device *dev)
 {
-	if (dev->link_list != NULL)
-		dev->ops = &exynos_displayport_operations;
+	printk(BIOS_SPEW, "%s: ", __function__);
+	printk(BIOS_SPEW, "set ops");
+	dev->ops = &exynos_displayport_operations;
+	printk(BIOS_SPEW, "\n");
 }

struct chip_operations drivers_i2c_exynos_displayport_ops = {
diff --git a/src/mainboard/google/snow/devicetree.cb b/src/mainboard/google/snow/devicetree.cb
index 5ad786e..9c3d206 100644
--- a/src/mainboard/google/snow/devicetree.cb
+++ b/src/mainboard/google/snow/devicetree.cb
@@ -17,18 +17,14 @@
 ## Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 ##

-# FIXME: this is just a stub for now
 chip cpu/samsung/exynos5250

-device cpu_cluster 0 on
-end
-
-device domain 0 on
    chip drivers/generic/generic # I2C0 controller
    	device i2c 6 on end # ?
    	device i2c 9 on end # ?
    end
    chip cpu/samsung/exynos5-common/displayport
+		device pnp 1.1 on end
    	register "xres" = "1366"
    	register "yres" = "768"
    	register "bpp" = "16"
@@ -43,4 +39,3 @@ device domain 0 on
    	register "lcdbase" = "0x10000000"
    end
 end
-end