[PATCH v2 42/53] MIPS: SGI-IP27: register the Odyssey graphics widget

[Imre Kaloz <kaloz@kernel.org>]

The Odyssey (VPro) graphics widget is a direct xtalk widget with no PCI
bridge in front of it, so it needs a platform_device of its own rather
than piggybacking on bridge_platform_create(). Its register aperture is
the widget's small window, and the sgi-odyssey DRM driver binds it.
The driver programs the board with the widget id of its master hub,
passed as the u32 property "sgi,master-widget".

Signed-off-by: Imre Kaloz <kaloz@kernel.org>
---
 arch/mips/sgi-ip27/ip27-xtalk.c | 39 +++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)

diff --git a/arch/mips/sgi-ip27/ip27-xtalk.c b/arch/mips/sgi-ip27/ip27-xtalk.c
index 091186cb7a04..b56e70db20cf 100644
--- a/arch/mips/sgi-ip27/ip27-xtalk.c
+++ b/arch/mips/sgi-ip27/ip27-xtalk.c
@@ -7,9 +7,11 @@
  * Generic XTALK initialization code
  */
 
+#include <linux/err.h>
 #include <linux/kernel.h>
 #include <linux/smp.h>
 #include <linux/platform_device.h>
+#include <linux/property.h>
 #include <linux/platform_data/sgi-w1.h>
 #include <linux/platform_data/xtalk-bridge.h>
 #include <asm/sn/addrs.h>
@@ -24,6 +26,9 @@
 #define PXBOW_WIDGET_PART_NUM	0xd100	/* PXbow */
 #define BASE_XBOW_PORT		8     /* Lowest external port */
 
+/* Odyssey's register aperture, as sized by the sgi-odyssey driver. */
+#define ODYSSEY_REG_SIZE		0x00410000
+
 enum xtalk_bridge_type {
 	XTALK_BRIDGE,
 	XTALK_XBRIDGE,
@@ -167,6 +172,37 @@ static void bridge_platform_create(nasid_t nasid, int widget, int masterwid,
 	return;
 }
 
+static void odyssey_platform_create(nasid_t nasid, int widget, int masterwid)
+{
+	const struct property_entry props[] = {
+		PROPERTY_ENTRY_U32("sgi,master-widget", masterwid),
+		{ }
+	};
+	struct resource res;
+	struct platform_device_info info = {
+		.name = "sgi-odyssey",
+		.id = PLATFORM_DEVID_AUTO,
+		.res = &res,
+		.num_res = 1,
+		.properties = props,
+	};
+	struct platform_device *pdev;
+
+	memset(&res, 0, sizeof(res));
+	res.name = "sgi-odyssey";
+	res.start = NODE_OFFSET(nasid) + (widget << SWIN_SIZE_BITS);
+	res.end = res.start + ODYSSEY_REG_SIZE - 1;
+	res.flags = IORESOURCE_MEM;
+
+	pr_info("xtalk:n%d/%x odyssey widget: reg=[%pa-%pa]\n",
+		nasid, widget, &res.start, &res.end);
+
+	pdev = platform_device_register_full(&info);
+	if (IS_ERR(pdev))
+		pr_warn("xtalk:n%d/%x odyssey platform device registration failed: %ld\n",
+			nasid, widget, PTR_ERR(pdev));
+}
+
 static int probe_one_port(nasid_t nasid, int widget, int masterwid)
 {
 	widgetreg_t		widget_id;
@@ -190,6 +226,9 @@ static int probe_one_port(nasid_t nasid, int widget, int masterwid)
 		bridge_platform_create(nasid, widget, masterwid,
 				       XTALK_PIC_BUS1);
 		break;
+	case WIDGET_ODYS_PART_NUM:
+		odyssey_platform_create(nasid, widget, masterwid);
+		break;
 	default:
 		pr_info("xtalk:n%d/%d unknown widget (0x%x)\n",
 			nasid, widget, partnum);
-- 
2.47.3