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drm/radeon/kms: clean up i2c

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- Change reg/mask names to match what we use internally
and in the bios
- Clarify how i2c over gpio on radeon actually works

Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Alex Deucher
2009-11-10 15:59:44 -05:00
committed by Dave Airlie
parent ab1e9ea08f
commit 9b9fe72488
5 changed files with 85 additions and 66 deletions
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41
drivers/gpu/drm/radeon/radeon_i2c.c
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@@ -78,16 +78,16 @@ void radeon_i2c_do_lock(struct radeon_i2c_chan *i2c, int lock_state)
R200_DVI_I2C_PIN_SEL(R200_SEL_DDC3)));
}
}
if (lock_state) {
temp = RREG32(rec->a_clk_reg);
temp &= ~(rec->a_clk_mask);
WREG32(rec->a_clk_reg, temp);
temp = RREG32(rec->a_data_reg);
temp &= ~(rec->a_data_mask);
WREG32(rec->a_data_reg, temp);
}
/* clear the output pin values */
temp = RREG32(rec->a_clk_reg) & ~rec->a_clk_mask;
WREG32(rec->a_clk_reg, temp);
temp = RREG32(rec->a_data_reg) & ~rec->a_data_mask;
WREG32(rec->a_data_reg, temp);
/* mask the gpio pins for software use */
temp = RREG32(rec->mask_clk_reg);
if (lock_state)
temp |= rec->mask_clk_mask;
@@ -112,8 +112,9 @@ static int get_clock(void *i2c_priv)
struct radeon_i2c_bus_rec *rec = &i2c->rec;
uint32_t val;
val = RREG32(rec->get_clk_reg);
val &= rec->get_clk_mask;
/* read the value off the pin */
val = RREG32(rec->y_clk_reg);
val &= rec->y_clk_mask;
return (val != 0);
}
@@ -126,8 +127,10 @@ static int get_data(void *i2c_priv)
struct radeon_i2c_bus_rec *rec = &i2c->rec;
uint32_t val;
val = RREG32(rec->get_data_reg);
val &= rec->get_data_mask;
/* read the value off the pin */
val = RREG32(rec->y_data_reg);
val &= rec->y_data_mask;
return (val != 0);
}
@@ -138,9 +141,10 @@ static void set_clock(void *i2c_priv, int clock)
struct radeon_i2c_bus_rec *rec = &i2c->rec;
uint32_t val;
val = RREG32(rec->put_clk_reg) & (uint32_t)~(rec->put_clk_mask);
val |= clock ? 0 : rec->put_clk_mask;
WREG32(rec->put_clk_reg, val);
/* set pin direction */
val = RREG32(rec->en_clk_reg) & ~rec->en_clk_mask;
val |= clock ? 0 : rec->en_clk_mask;
WREG32(rec->en_clk_reg, val);
}
static void set_data(void *i2c_priv, int data)
@@ -150,9 +154,10 @@ static void set_data(void *i2c_priv, int data)
struct radeon_i2c_bus_rec *rec = &i2c->rec;
uint32_t val;
val = RREG32(rec->put_data_reg) & (uint32_t)~(rec->put_data_mask);
val |= data ? 0 : rec->put_data_mask;
WREG32(rec->put_data_reg, val);
/* set pin direction */
val = RREG32(rec->en_data_reg) & ~rec->en_data_mask;
val |= data ? 0 : rec->en_data_mask;
WREG32(rec->en_data_reg, val);
}
struct radeon_i2c_chan *radeon_i2c_create(struct drm_device *dev,