diff options
| author | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2010-08-09 10:16:36 +0400 |
|---|---|---|
| committer | Dave Airlie <airlied@redhat.com> | 2010-08-12 03:41:20 +0400 |
| commit | 7b044f40108700b02d4f6aae2836e0d84a11fc04 (patch) | |
| tree | 405df57b21998e8a87ab7fda1b7ccb1836350bbe /drivers/gpu/drm/radeon/radeon_clocks.c | |
| parent | b494d5d468ea3f0c536a01336ed387fb9cc49f01 (diff) | |
| download | linux-7b044f40108700b02d4f6aae2836e0d84a11fc04.tar.xz | |
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.c | 81 |
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) { |