diff options
Diffstat (limited to 'drivers/gpu/drm/radeon/radeon_i2c.c')
| -rw-r--r-- | drivers/gpu/drm/radeon/radeon_i2c.c | 182 |
1 files changed, 141 insertions, 41 deletions
diff --git a/drivers/gpu/drm/radeon/radeon_i2c.c b/drivers/gpu/drm/radeon/radeon_i2c.c index dd438d32e5c0..da3da1e89d00 100644 --- a/drivers/gpu/drm/radeon/radeon_i2c.c +++ b/drivers/gpu/drm/radeon/radeon_i2c.c @@ -59,35 +59,43 @@ 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 * doing DDC - do this for all r200s/r300s/r400s for safety sake */ - if ((rdev->family >= CHIP_R200) && !ASIC_IS_AVIVO(rdev)) { - if (rec->a_clk_reg == RADEON_GPIO_MONID) { - WREG32(RADEON_DVI_I2C_CNTL_0, (RADEON_I2C_SOFT_RST | - R200_DVI_I2C_PIN_SEL(R200_SEL_DDC1))); - } else { - WREG32(RADEON_DVI_I2C_CNTL_0, (RADEON_I2C_SOFT_RST | - R200_DVI_I2C_PIN_SEL(R200_SEL_DDC3))); + if (rec->hw_capable) { + if ((rdev->family >= CHIP_R200) && !ASIC_IS_AVIVO(rdev)) { + if (rec->a_clk_reg == RADEON_GPIO_MONID) { + WREG32(RADEON_DVI_I2C_CNTL_0, (RADEON_I2C_SOFT_RST | + R200_DVI_I2C_PIN_SEL(R200_SEL_DDC1))); + } else { + WREG32(RADEON_DVI_I2C_CNTL_0, (RADEON_I2C_SOFT_RST | + 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); + + /* set the pins to input */ + temp = RREG32(rec->en_clk_reg) & ~rec->en_clk_mask; + WREG32(rec->en_clk_reg, temp); + + temp = RREG32(rec->en_data_reg) & ~rec->en_data_mask; + WREG32(rec->en_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 +120,9 @@ 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 +135,10 @@ 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 +149,10 @@ 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 +162,15 @@ 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; @@ -167,20 +180,19 @@ struct radeon_i2c_chan *radeon_i2c_create(struct drm_device *dev, return NULL; i2c->adapter.owner = THIS_MODULE; - i2c->adapter.algo_data = &i2c->algo; i2c->dev = dev; - i2c->algo.setsda = set_data; - i2c->algo.setscl = set_clock; - i2c->algo.getsda = get_data; - i2c->algo.getscl = get_clock; - i2c->algo.udelay = 20; + i2c_set_adapdata(&i2c->adapter, i2c); + i2c->adapter.algo_data = &i2c->algo.bit; + i2c->algo.bit.setsda = set_data; + i2c->algo.bit.setscl = set_clock; + i2c->algo.bit.getsda = get_data; + i2c->algo.bit.getscl = get_clock; + i2c->algo.bit.udelay = 20; /* vesa says 2.2 ms is enough, 1 jiffy doesn't seem to always * make this, 2 jiffies is a lot more reliable */ - i2c->algo.timeout = 2; - i2c->algo.data = i2c; + i2c->algo.bit.timeout = 2; + i2c->algo.bit.data = i2c; i2c->rec = *rec; - i2c_set_adapdata(&i2c->adapter, i2c); - ret = i2c_bit_add_bus(&i2c->adapter); if (ret) { DRM_INFO("Failed to register i2c %s\n", name); @@ -194,6 +206,38 @@ out_free: } +struct radeon_i2c_chan *radeon_i2c_create_dp(struct drm_device *dev, + struct radeon_i2c_bus_rec *rec, + const char *name) +{ + struct radeon_i2c_chan *i2c; + int ret; + + i2c = kzalloc(sizeof(struct radeon_i2c_chan), GFP_KERNEL); + if (i2c == NULL) + return NULL; + + i2c->rec = *rec; + i2c->adapter.owner = THIS_MODULE; + i2c->dev = dev; + i2c_set_adapdata(&i2c->adapter, i2c); + i2c->adapter.algo_data = &i2c->algo.dp; + i2c->algo.dp.aux_ch = radeon_dp_i2c_aux_ch; + i2c->algo.dp.address = 0; + ret = i2c_dp_aux_add_bus(&i2c->adapter); + if (ret) { + DRM_INFO("Failed to register i2c %s\n", name); + goto out_free; + } + + return i2c; +out_free: + kfree(i2c); + return NULL; + +} + + void radeon_i2c_destroy(struct radeon_i2c_chan *i2c) { if (!i2c) @@ -207,3 +251,59 @@ 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); +} + |