2 * Copyright 2007-8 Advanced Micro Devices, Inc.
3 * Copyright 2008 Red Hat Inc.
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the "Software"),
7 * to deal in the Software without restriction, including without limitation
8 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
9 * and/or sell copies of the Software, and to permit persons to whom the
10 * Software is furnished to do so, subject to the following conditions:
12 * The above copyright notice and this permission notice shall be included in
13 * all copies or substantial portions of the Software.
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
19 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
20 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
21 * OTHER DEALINGS IN THE SOFTWARE.
23 * Authors: Dave Airlie
27 #include <linux/export.h>
28 #include <linux/pci.h>
30 #include <drm/drm_edid.h>
31 #include <drm/amdgpu_drm.h>
33 #include "amdgpu_i2c.h"
34 #include "amdgpu_atombios.h"
36 #include "atombios_dp.h"
37 #include "atombios_i2c.h"
40 static int amdgpu_i2c_pre_xfer(struct i2c_adapter *i2c_adap)
42 struct amdgpu_i2c_chan *i2c = i2c_get_adapdata(i2c_adap);
43 struct amdgpu_device *adev = i2c->dev->dev_private;
44 struct amdgpu_i2c_bus_rec *rec = &i2c->rec;
47 mutex_lock(&i2c->mutex);
49 /* switch the pads to ddc mode */
50 if (rec->hw_capable) {
51 temp = RREG32(rec->mask_clk_reg);
53 WREG32(rec->mask_clk_reg, temp);
56 /* clear the output pin values */
57 temp = RREG32(rec->a_clk_reg) & ~rec->a_clk_mask;
58 WREG32(rec->a_clk_reg, temp);
60 temp = RREG32(rec->a_data_reg) & ~rec->a_data_mask;
61 WREG32(rec->a_data_reg, temp);
63 /* set the pins to input */
64 temp = RREG32(rec->en_clk_reg) & ~rec->en_clk_mask;
65 WREG32(rec->en_clk_reg, temp);
67 temp = RREG32(rec->en_data_reg) & ~rec->en_data_mask;
68 WREG32(rec->en_data_reg, temp);
70 /* mask the gpio pins for software use */
71 temp = RREG32(rec->mask_clk_reg) | rec->mask_clk_mask;
72 WREG32(rec->mask_clk_reg, temp);
73 temp = RREG32(rec->mask_clk_reg);
75 temp = RREG32(rec->mask_data_reg) | rec->mask_data_mask;
76 WREG32(rec->mask_data_reg, temp);
77 temp = RREG32(rec->mask_data_reg);
82 static void amdgpu_i2c_post_xfer(struct i2c_adapter *i2c_adap)
84 struct amdgpu_i2c_chan *i2c = i2c_get_adapdata(i2c_adap);
85 struct amdgpu_device *adev = i2c->dev->dev_private;
86 struct amdgpu_i2c_bus_rec *rec = &i2c->rec;
89 /* unmask the gpio pins for software use */
90 temp = RREG32(rec->mask_clk_reg) & ~rec->mask_clk_mask;
91 WREG32(rec->mask_clk_reg, temp);
92 temp = RREG32(rec->mask_clk_reg);
94 temp = RREG32(rec->mask_data_reg) & ~rec->mask_data_mask;
95 WREG32(rec->mask_data_reg, temp);
96 temp = RREG32(rec->mask_data_reg);
98 mutex_unlock(&i2c->mutex);
101 static int amdgpu_i2c_get_clock(void *i2c_priv)
103 struct amdgpu_i2c_chan *i2c = i2c_priv;
104 struct amdgpu_device *adev = i2c->dev->dev_private;
105 struct amdgpu_i2c_bus_rec *rec = &i2c->rec;
108 /* read the value off the pin */
109 val = RREG32(rec->y_clk_reg);
110 val &= rec->y_clk_mask;
116 static int amdgpu_i2c_get_data(void *i2c_priv)
118 struct amdgpu_i2c_chan *i2c = i2c_priv;
119 struct amdgpu_device *adev = i2c->dev->dev_private;
120 struct amdgpu_i2c_bus_rec *rec = &i2c->rec;
123 /* read the value off the pin */
124 val = RREG32(rec->y_data_reg);
125 val &= rec->y_data_mask;
130 static void amdgpu_i2c_set_clock(void *i2c_priv, int clock)
132 struct amdgpu_i2c_chan *i2c = i2c_priv;
133 struct amdgpu_device *adev = i2c->dev->dev_private;
134 struct amdgpu_i2c_bus_rec *rec = &i2c->rec;
137 /* set pin direction */
138 val = RREG32(rec->en_clk_reg) & ~rec->en_clk_mask;
139 val |= clock ? 0 : rec->en_clk_mask;
140 WREG32(rec->en_clk_reg, val);
143 static void amdgpu_i2c_set_data(void *i2c_priv, int data)
145 struct amdgpu_i2c_chan *i2c = i2c_priv;
146 struct amdgpu_device *adev = i2c->dev->dev_private;
147 struct amdgpu_i2c_bus_rec *rec = &i2c->rec;
150 /* set pin direction */
151 val = RREG32(rec->en_data_reg) & ~rec->en_data_mask;
152 val |= data ? 0 : rec->en_data_mask;
153 WREG32(rec->en_data_reg, val);
156 static const struct i2c_algorithm amdgpu_atombios_i2c_algo = {
157 .master_xfer = amdgpu_atombios_i2c_xfer,
158 .functionality = amdgpu_atombios_i2c_func,
161 struct amdgpu_i2c_chan *amdgpu_i2c_create(struct drm_device *dev,
162 const struct amdgpu_i2c_bus_rec *rec,
165 struct amdgpu_i2c_chan *i2c;
168 /* don't add the mm_i2c bus unless hw_i2c is enabled */
169 if (rec->mm_i2c && (amdgpu_hw_i2c == 0))
172 i2c = kzalloc(sizeof(struct amdgpu_i2c_chan), GFP_KERNEL);
177 i2c->adapter.owner = THIS_MODULE;
178 i2c->adapter.class = I2C_CLASS_DDC;
179 i2c->adapter.dev.parent = &dev->pdev->dev;
181 i2c_set_adapdata(&i2c->adapter, i2c);
182 mutex_init(&i2c->mutex);
183 if (rec->hw_capable &&
185 /* hw i2c using atom */
186 snprintf(i2c->adapter.name, sizeof(i2c->adapter.name),
187 "AMDGPU i2c hw bus %s", name);
188 i2c->adapter.algo = &amdgpu_atombios_i2c_algo;
189 ret = i2c_add_adapter(&i2c->adapter);
193 /* set the amdgpu bit adapter */
194 snprintf(i2c->adapter.name, sizeof(i2c->adapter.name),
195 "AMDGPU i2c bit bus %s", name);
196 i2c->adapter.algo_data = &i2c->bit;
197 i2c->bit.pre_xfer = amdgpu_i2c_pre_xfer;
198 i2c->bit.post_xfer = amdgpu_i2c_post_xfer;
199 i2c->bit.setsda = amdgpu_i2c_set_data;
200 i2c->bit.setscl = amdgpu_i2c_set_clock;
201 i2c->bit.getsda = amdgpu_i2c_get_data;
202 i2c->bit.getscl = amdgpu_i2c_get_clock;
203 i2c->bit.udelay = 10;
204 i2c->bit.timeout = usecs_to_jiffies(2200); /* from VESA */
206 ret = i2c_bit_add_bus(&i2c->adapter);
208 DRM_ERROR("Failed to register bit i2c %s\n", name);
220 void amdgpu_i2c_destroy(struct amdgpu_i2c_chan *i2c)
224 WARN_ON(i2c->has_aux);
225 i2c_del_adapter(&i2c->adapter);
229 /* Add the default buses */
230 void amdgpu_i2c_init(struct amdgpu_device *adev)
233 DRM_INFO("hw_i2c forced on, you may experience display detection problems!\n");
235 amdgpu_atombios_i2c_init(adev);
238 /* remove all the buses */
239 void amdgpu_i2c_fini(struct amdgpu_device *adev)
243 for (i = 0; i < AMDGPU_MAX_I2C_BUS; i++) {
244 if (adev->i2c_bus[i]) {
245 amdgpu_i2c_destroy(adev->i2c_bus[i]);
246 adev->i2c_bus[i] = NULL;
251 /* Add additional buses */
252 void amdgpu_i2c_add(struct amdgpu_device *adev,
253 const struct amdgpu_i2c_bus_rec *rec,
256 struct drm_device *dev = adev->ddev;
259 for (i = 0; i < AMDGPU_MAX_I2C_BUS; i++) {
260 if (!adev->i2c_bus[i]) {
261 adev->i2c_bus[i] = amdgpu_i2c_create(dev, rec, name);
267 /* looks up bus based on id */
268 struct amdgpu_i2c_chan *
269 amdgpu_i2c_lookup(struct amdgpu_device *adev,
270 const struct amdgpu_i2c_bus_rec *i2c_bus)
274 for (i = 0; i < AMDGPU_MAX_I2C_BUS; i++) {
275 if (adev->i2c_bus[i] &&
276 (adev->i2c_bus[i]->rec.i2c_id == i2c_bus->i2c_id)) {
277 return adev->i2c_bus[i];
283 static void amdgpu_i2c_get_byte(struct amdgpu_i2c_chan *i2c_bus,
290 struct i2c_msg msgs[] = {
308 if (i2c_transfer(&i2c_bus->adapter, msgs, 2) == 2) {
310 DRM_DEBUG("val = 0x%02x\n", *val);
312 DRM_DEBUG("i2c 0x%02x 0x%02x read failed\n",
317 static void amdgpu_i2c_put_byte(struct amdgpu_i2c_chan *i2c_bus,
323 struct i2c_msg msg = {
333 if (i2c_transfer(&i2c_bus->adapter, &msg, 1) != 1)
334 DRM_DEBUG("i2c 0x%02x 0x%02x write failed\n",
338 /* ddc router switching */
340 amdgpu_i2c_router_select_ddc_port(const struct amdgpu_connector *amdgpu_connector)
344 if (!amdgpu_connector->router.ddc_valid)
347 if (!amdgpu_connector->router_bus)
350 amdgpu_i2c_get_byte(amdgpu_connector->router_bus,
351 amdgpu_connector->router.i2c_addr,
353 val &= ~amdgpu_connector->router.ddc_mux_control_pin;
354 amdgpu_i2c_put_byte(amdgpu_connector->router_bus,
355 amdgpu_connector->router.i2c_addr,
357 amdgpu_i2c_get_byte(amdgpu_connector->router_bus,
358 amdgpu_connector->router.i2c_addr,
360 val &= ~amdgpu_connector->router.ddc_mux_control_pin;
361 val |= amdgpu_connector->router.ddc_mux_state;
362 amdgpu_i2c_put_byte(amdgpu_connector->router_bus,
363 amdgpu_connector->router.i2c_addr,
367 /* clock/data router switching */
369 amdgpu_i2c_router_select_cd_port(const struct amdgpu_connector *amdgpu_connector)
373 if (!amdgpu_connector->router.cd_valid)
376 if (!amdgpu_connector->router_bus)
379 amdgpu_i2c_get_byte(amdgpu_connector->router_bus,
380 amdgpu_connector->router.i2c_addr,
382 val &= ~amdgpu_connector->router.cd_mux_control_pin;
383 amdgpu_i2c_put_byte(amdgpu_connector->router_bus,
384 amdgpu_connector->router.i2c_addr,
386 amdgpu_i2c_get_byte(amdgpu_connector->router_bus,
387 amdgpu_connector->router.i2c_addr,
389 val &= ~amdgpu_connector->router.cd_mux_control_pin;
390 val |= amdgpu_connector->router.cd_mux_state;
391 amdgpu_i2c_put_byte(amdgpu_connector->router_bus,
392 amdgpu_connector->router.i2c_addr,