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authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2010-08-09 16:16:36 +1000
committerDave Airlie <airlied@redhat.com>2010-08-12 09:41:20 +1000
commit7b044f40108700b02d4f6aae2836e0d84a11fc04 (patch)
tree405df57b21998e8a87ab7fda1b7ccb1836350bbe /drivers/gpu/drm/radeon/radeon_clocks.c
parentb494d5d468ea3f0c536a01336ed387fb9cc49f01 (diff)
drm/radeon: Add probing of clocks from device-tree
When we find no ROM we understand and a device-tree is present, see if we can retreive clock info from there. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Dave Airlie <airlied@redhat.com>
Diffstat (limited to 'drivers/gpu/drm/radeon/radeon_clocks.c')
-rw-r--r--drivers/gpu/drm/radeon/radeon_clocks.c81
1 files changed, 81 insertions, 0 deletions
diff --git a/drivers/gpu/drm/radeon/radeon_clocks.c b/drivers/gpu/drm/radeon/radeon_clocks.c
index f64936cc4dd9..14448a740ba6 100644
--- a/drivers/gpu/drm/radeon/radeon_clocks.c
+++ b/drivers/gpu/drm/radeon/radeon_clocks.c
@@ -91,6 +91,85 @@ uint32_t radeon_legacy_get_memory_clock(struct radeon_device *rdev)
return mclk;
}
+#ifdef CONFIG_OF
+/*
+ * Read XTAL (ref clock), SCLK and MCLK from Open Firmware device
+ * tree. Hopefully, ATI OF driver is kind enough to fill these
+ */
+static bool __devinit radeon_read_clocks_OF(struct drm_device *dev)
+{
+ struct radeon_device *rdev = dev->dev_private;
+ struct device_node *dp = rdev->pdev->dev.of_node;
+ const u32 *val;
+ struct radeon_pll *p1pll = &rdev->clock.p1pll;
+ struct radeon_pll *p2pll = &rdev->clock.p2pll;
+ struct radeon_pll *spll = &rdev->clock.spll;
+ struct radeon_pll *mpll = &rdev->clock.mpll;
+
+ if (dp == NULL)
+ return false;
+ val = of_get_property(dp, "ATY,RefCLK", NULL);
+ if (!val || !*val) {
+ printk(KERN_WARNING "radeonfb: No ATY,RefCLK property !\n");
+ return false;
+ }
+ p1pll->reference_freq = p2pll->reference_freq = (*val) / 10;
+ p1pll->reference_div = RREG32_PLL(RADEON_PPLL_REF_DIV) & 0x3ff;
+ if (p1pll->reference_div < 2)
+ p1pll->reference_div = 12;
+ p2pll->reference_div = p1pll->reference_div;
+
+ /* These aren't in the device-tree */
+ if (rdev->family >= CHIP_R420) {
+ p1pll->pll_in_min = 100;
+ p1pll->pll_in_max = 1350;
+ p1pll->pll_out_min = 20000;
+ p1pll->pll_out_max = 50000;
+ p2pll->pll_in_min = 100;
+ p2pll->pll_in_max = 1350;
+ p2pll->pll_out_min = 20000;
+ p2pll->pll_out_max = 50000;
+ } else {
+ p1pll->pll_in_min = 40;
+ p1pll->pll_in_max = 500;
+ p1pll->pll_out_min = 12500;
+ p1pll->pll_out_max = 35000;
+ p2pll->pll_in_min = 40;
+ p2pll->pll_in_max = 500;
+ p2pll->pll_out_min = 12500;
+ p2pll->pll_out_max = 35000;
+ }
+
+ spll->reference_freq = mpll->reference_freq = p1pll->reference_freq;
+ spll->reference_div = mpll->reference_div =
+ RREG32_PLL(RADEON_M_SPLL_REF_FB_DIV) &
+ RADEON_M_SPLL_REF_DIV_MASK;
+
+ val = of_get_property(dp, "ATY,SCLK", NULL);
+ if (val && *val)
+ rdev->clock.default_sclk = (*val) / 10;
+ else
+ rdev->clock.default_sclk =
+ radeon_legacy_get_engine_clock(rdev);
+
+ val = of_get_property(dp, "ATY,MCLK", NULL);
+ if (val && *val)
+ rdev->clock.default_mclk = (*val) / 10;
+ else
+ rdev->clock.default_mclk =
+ radeon_legacy_get_memory_clock(rdev);
+
+ DRM_INFO("Using device-tree clock info\n");
+
+ return true;
+}
+#else
+static bool __devinit radeon_read_clocks_OF(struct drm_device *dev)
+{
+ return false;
+}
+#endif /* CONFIG_OF */
+
void radeon_get_clock_info(struct drm_device *dev)
{
struct radeon_device *rdev = dev->dev_private;
@@ -105,6 +184,8 @@ void radeon_get_clock_info(struct drm_device *dev)
ret = radeon_atom_get_clock_info(dev);
else
ret = radeon_combios_get_clock_info(dev);
+ if (!ret)
+ ret = radeon_read_clocks_OF(dev);
if (ret) {
if (p1pll->reference_div < 2) {