diff options
Diffstat (limited to 'drivers/gpu/drm/radeon/radeon_i2c.c')
-rw-r--r-- | drivers/gpu/drm/radeon/radeon_i2c.c | 109 |
1 files changed, 85 insertions, 24 deletions
diff --git a/drivers/gpu/drm/radeon/radeon_i2c.c b/drivers/gpu/drm/radeon/radeon_i2c.c index dd438d3..6c645fb 100644 --- a/drivers/gpu/drm/radeon/radeon_i2c.c +++ b/drivers/gpu/drm/radeon/radeon_i2c.c @@ -59,11 +59,11 @@ bool radeon_ddc_probe(struct radeon_connector *radeon_connector) } -void radeon_i2c_do_lock(struct radeon_connector *radeon_connector, int lock_state) +void radeon_i2c_do_lock(struct radeon_i2c_chan *i2c, int lock_state) { - struct radeon_device *rdev = radeon_connector->base.dev->dev_private; + struct radeon_device *rdev = i2c->dev->dev_private; + struct radeon_i2c_bus_rec *rec = &i2c->rec; uint32_t temp; - struct radeon_i2c_bus_rec *rec = &radeon_connector->ddc_bus->rec; /* RV410 appears to have a bug where the hw i2c in reset * holds the i2c port in a bad state - switch hw i2c away before @@ -78,16 +78,16 @@ void radeon_i2c_do_lock(struct radeon_connector *radeon_connector, int lock_stat 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) @@ -150,14 +154,15 @@ 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, - struct radeon_i2c_bus_rec *rec, - const char *name) + struct radeon_i2c_bus_rec *rec, + const char *name) { struct radeon_i2c_chan *i2c; int ret; @@ -207,3 +212,59 @@ struct drm_encoder *radeon_best_encoder(struct drm_connector *connector) { return NULL; } + +void radeon_i2c_sw_get_byte(struct radeon_i2c_chan *i2c_bus, + u8 slave_addr, + u8 addr, + u8 *val) +{ + u8 out_buf[2]; + u8 in_buf[2]; + struct i2c_msg msgs[] = { + { + .addr = slave_addr, + .flags = 0, + .len = 1, + .buf = out_buf, + }, + { + .addr = slave_addr, + .flags = I2C_M_RD, + .len = 1, + .buf = in_buf, + } + }; + + out_buf[0] = addr; + out_buf[1] = 0; + + if (i2c_transfer(&i2c_bus->adapter, msgs, 2) == 2) { + *val = in_buf[0]; + DRM_DEBUG("val = 0x%02x\n", *val); + } else { + DRM_ERROR("i2c 0x%02x 0x%02x read failed\n", + addr, *val); + } +} + +void radeon_i2c_sw_put_byte(struct radeon_i2c_chan *i2c_bus, + u8 slave_addr, + u8 addr, + u8 val) +{ + uint8_t out_buf[2]; + struct i2c_msg msg = { + .addr = slave_addr, + .flags = 0, + .len = 2, + .buf = out_buf, + }; + + out_buf[0] = addr; + out_buf[1] = val; + + if (i2c_transfer(&i2c_bus->adapter, &msg, 1) != 1) + DRM_ERROR("i2c 0x%02x 0x%02x write failed\n", + addr, val); +} + |