linux-kernel - [PATCH 3/3] alpha, drm: Add Alpha support to Radeon DRM code

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Message-ID: <20110609182021.73726ea3.jay.estabrook_gmail.com@gmail.com>
Date:	Thu, 9 Jun 2011 18:20:21 -0400
From:	Jay Estabrook <jay.estabrook@...il.com>
To:	linux-alpha <linux-alpha@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	dri-devel <dri-devel@...ts.freedesktop.org>
Cc:	Matt Turner <mattst88@...il.com>,
	Richard Henderson <rth@...ddle.net>,
	Ivan Kokshaysky <ink@...assic.park.msu.ru>,
	Jay Estabrook <jay.estabrook@...il.com>, airlied@...ux.ie
Subject: [PATCH 3/3] alpha, drm: Add Alpha support to Radeon DRM code


Alpha needs to have the system bus address for the device's local
memory available, so that it can be returned to user-level, where
it may be used in an mmap(). So, we make bus.addr hold the ioremap()
return for kernel use, and then we can modify bus.base appropriately.

Signed-off-by: Jay Estabrook <jay.estabrook@...il.com>
---
 drivers/gpu/drm/radeon/radeon_ttm.c |   23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff -Naurp a/drivers/gpu/drm/radeon/radeon_ttm.c b/drivers/gpu/drm/radeon/radeon_ttm.c
--- a/drivers/gpu/drm/radeon/radeon_ttm.c	2011-04-26 23:48:50.000000000 -0400
+++ b/drivers/gpu/drm/radeon/radeon_ttm.c	2011-05-03 18:24:27.000000000 -0400
@@ -450,6 +450,29 @@ static int radeon_ttm_io_mem_reserve(str
 			return -EINVAL;
 		mem->bus.base = rdev->mc.aper_base;
 		mem->bus.is_iomem = true;
+#ifdef __alpha__
+		/*
+		 * Alpha: use bus.addr to hold the ioremap() return,
+		 * so we can modify bus.base below.
+		 */
+		if (mem->placement & TTM_PL_FLAG_WC)
+			mem->bus.addr =
+				ioremap_wc(mem->bus.base + mem->bus.offset,
+					   mem->bus.size);
+		else
+			mem->bus.addr =
+				ioremap_nocache(mem->bus.base + mem->bus.offset,
+						mem->bus.size);
+
+		/*
+		 * Alpha: Take just the bus offset and
+		 * add the hose/domain memory base.
+		 * Then, bus.base can be returned
+		 * for use in an mmap() call.
+		 */
+		mem->bus.base = (mem->bus.base & 0x0ffffffffUL) +
+			rdev->ddev->hose->dense_mem_base;
+#endif
 		break;
 	default:
 		return -EINVAL;

---
--
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