diff options
Diffstat (limited to 'drivers/gpu/drm/radeon/radeon_i2c.c')
| -rw-r--r-- | drivers/gpu/drm/radeon/radeon_i2c.c | 209 |
1 files changed, 209 insertions, 0 deletions
diff --git a/drivers/gpu/drm/radeon/radeon_i2c.c b/drivers/gpu/drm/radeon/radeon_i2c.c new file mode 100644 index 00000000000..71465ed2688 --- /dev/null +++ b/drivers/gpu/drm/radeon/radeon_i2c.c @@ -0,0 +1,209 @@ +/* + * Copyright 2007-8 Advanced Micro Devices, Inc. + * Copyright 2008 Red Hat Inc. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR + * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, + * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR + * OTHER DEALINGS IN THE SOFTWARE. + * + * Authors: Dave Airlie + * Alex Deucher + */ +#include "drmP.h" +#include "radeon_drm.h" +#include "radeon.h" + +/** + * radeon_ddc_probe + * + */ +bool radeon_ddc_probe(struct radeon_connector *radeon_connector) +{ + u8 out_buf[] = { 0x0, 0x0}; + u8 buf[2]; + int ret; + struct i2c_msg msgs[] = { + { + .addr = 0x50, + .flags = 0, + .len = 1, + .buf = out_buf, + }, + { + .addr = 0x50, + .flags = I2C_M_RD, + .len = 1, + .buf = buf, + } + }; + + ret = i2c_transfer(&radeon_connector->ddc_bus->adapter, msgs, 2); + if (ret == 2) + return true; + + return false; +} + + +void radeon_i2c_do_lock(struct radeon_connector *radeon_connector, int lock_state) +{ + struct radeon_device *rdev = radeon_connector->base.dev->dev_private; + 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 (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); + } + + temp = RREG32(rec->mask_clk_reg); + if (lock_state) + temp |= rec->mask_clk_mask; + else + temp &= ~rec->mask_clk_mask; + WREG32(rec->mask_clk_reg, temp); + temp = RREG32(rec->mask_clk_reg); + + temp = RREG32(rec->mask_data_reg); + if (lock_state) + temp |= rec->mask_data_mask; + else + temp &= ~rec->mask_data_mask; + WREG32(rec->mask_data_reg, temp); + temp = RREG32(rec->mask_data_reg); +} + +static int get_clock(void *i2c_priv) +{ + struct radeon_i2c_chan *i2c = i2c_priv; + struct radeon_device *rdev = i2c->dev->dev_private; + struct radeon_i2c_bus_rec *rec = &i2c->rec; + uint32_t val; + + val = RREG32(rec->get_clk_reg); + val &= rec->get_clk_mask; + + return (val != 0); +} + + +static int get_data(void *i2c_priv) +{ + struct radeon_i2c_chan *i2c = i2c_priv; + struct radeon_device *rdev = i2c->dev->dev_private; + struct radeon_i2c_bus_rec *rec = &i2c->rec; + uint32_t val; + + val = RREG32(rec->get_data_reg); + val &= rec->get_data_mask; + return (val != 0); +} + +static void set_clock(void *i2c_priv, int clock) +{ + struct radeon_i2c_chan *i2c = i2c_priv; + struct radeon_device *rdev = i2c->dev->dev_private; + 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); +} + +static void set_data(void *i2c_priv, int data) +{ + struct radeon_i2c_chan *i2c = i2c_priv; + struct radeon_device *rdev = i2c->dev->dev_private; + 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); +} + +struct radeon_i2c_chan *radeon_i2c_create(struct drm_device *dev, + struct radeon_i2c_bus_rec *rec, + const char *name) +{ + struct radeon_i2c_chan *i2c; + int ret; + + i2c = drm_calloc(1, sizeof(struct radeon_i2c_chan), DRM_MEM_DRIVER); + if (i2c == NULL) + 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; + /* 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->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); + goto out_free; + } + + return i2c; +out_free: + drm_free(i2c, sizeof(struct radeon_i2c_chan), DRM_MEM_DRIVER); + return NULL; + +} + +void radeon_i2c_destroy(struct radeon_i2c_chan *i2c) +{ + if (!i2c) + return; + + i2c_del_adapter(&i2c->adapter); + drm_free(i2c, sizeof(struct radeon_i2c_chan), DRM_MEM_DRIVER); +} + +struct drm_encoder *radeon_best_encoder(struct drm_connector *connector) +{ + return NULL; +} |