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drm/i915: Create GEN specific read MMIO 

Extracting the MMIO read functionality makes per gen handling a bit
simpler, and the overall function a lot easier to read. The increasing
complexity of reads doesn't get too bad as the generation number
increases:

gen[2-4]: Nothing special
gen5: ILK dummy write workaround
gen6+: forcewake shenanigans

Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Reviewed-by: Damien Lespiau <damien.lespiau@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Ben Widawsky 2013-10-04 21:22:53 -07:00 committed by Daniel Vetter
parent 5d73879596
commit 3967018ed6
1 changed files with 59 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

72
drivers/gpu/drm/i915/intel_uncore.c
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@ -351,12 +351,27 @@ hsw_unclaimed_reg_check(struct drm_i915_private *dev_priv, u32 reg)
trace_i915_reg_rw(false, reg, val, sizeof(val), trace); \
return val
#define __i915_read(x) \
#define __gen4_read(x) \
static u##x \
i915_read##x(struct drm_i915_private *dev_priv, off_t reg, bool trace) { \
gen4_read##x(struct drm_i915_private *dev_priv, off_t reg, bool trace) { \
REG_READ_HEADER(x); \
val = __raw_i915_read##x(dev_priv, reg); \
REG_READ_FOOTER; \
}
#define __gen5_read(x) \
static u##x \
gen5_read##x(struct drm_i915_private *dev_priv, off_t reg, bool trace) { \
REG_READ_HEADER(x); \
ilk_dummy_write(dev_priv); \
val = __raw_i915_read##x(dev_priv, reg); \
REG_READ_FOOTER; \
}
#define __gen6_read(x) \
static u##x \
gen6_read##x(struct drm_i915_private *dev_priv, off_t reg, bool trace) { \
REG_READ_HEADER(x); \
if (dev_priv->info->gen == 5) \
ilk_dummy_write(dev_priv); \
if (NEEDS_FORCE_WAKE((dev_priv), (reg))) { \
if (dev_priv->uncore.forcewake_count == 0) \
dev_priv->uncore.funcs.force_wake_get(dev_priv); \
@ -369,11 +384,22 @@ i915_read##x(struct drm_i915_private *dev_priv, off_t reg, bool trace) { \
REG_READ_FOOTER; \
}
__i915_read(8)
__i915_read(16)
__i915_read(32)
__i915_read(64)
#undef __i915_read
__gen6_read(8)
__gen6_read(16)
__gen6_read(32)
__gen6_read(64)
__gen5_read(8)
__gen5_read(16)
__gen5_read(32)
__gen5_read(64)
__gen4_read(8)
__gen4_read(16)
__gen4_read(32)
__gen4_read(64)
#undef __gen6_read
#undef __gen5_read
#undef __gen4_read
#undef REG_READ_FOOTER
#undef REG_READ_HEADER
@ -400,6 +426,7 @@ i915_write##x(struct drm_i915_private *dev_priv, off_t reg, u##x val, bool trace
hsw_unclaimed_reg_check(dev_priv, reg); \
spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags); \
}
__i915_write(8)
__i915_write(16)
__i915_write(32)
@ -458,10 +485,29 @@ void intel_uncore_init(struct drm_device *dev)
__gen6_gt_force_wake_put;
}
dev_priv->uncore.funcs.mmio_readb = i915_read8;
dev_priv->uncore.funcs.mmio_readw = i915_read16;
dev_priv->uncore.funcs.mmio_readl = i915_read32;
dev_priv->uncore.funcs.mmio_readq = i915_read64;
switch (INTEL_INFO(dev)->gen) {
case 7:
case 6:
dev_priv->uncore.funcs.mmio_readb = gen6_read8;
dev_priv->uncore.funcs.mmio_readw = gen6_read16;
dev_priv->uncore.funcs.mmio_readl = gen6_read32;
dev_priv->uncore.funcs.mmio_readq = gen6_read64;
break;
case 5:
dev_priv->uncore.funcs.mmio_readb = gen5_read8;
dev_priv->uncore.funcs.mmio_readw = gen5_read16;
dev_priv->uncore.funcs.mmio_readl = gen5_read32;
dev_priv->uncore.funcs.mmio_readq = gen5_read64;
break;
case 4:
case 3:
case 2:
dev_priv->uncore.funcs.mmio_readb = gen4_read8;
dev_priv->uncore.funcs.mmio_readw = gen4_read16;
dev_priv->uncore.funcs.mmio_readl = gen4_read32;
dev_priv->uncore.funcs.mmio_readq = gen4_read64;
break;
}
dev_priv->uncore.funcs.mmio_writeb = i915_write8;
dev_priv->uncore.funcs.mmio_writew = i915_write16;
dev_priv->uncore.funcs.mmio_writel = i915_write32;