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Diffstat (limited to 'drivers/gpu/drm/radeon/radeon_i2c.c')
-rw-r--r--drivers/gpu/drm/radeon/radeon_i2c.c209
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 000000000000..71465ed2688a
--- /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;
+}
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