1 /*
2 * Copyright © 2013 Intel Corporation
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
13 * Software.
14 *
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 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
21 * IN THE SOFTWARE.
22 *
23 */
24
25 #include "i915_drv.h"
26 #include "intel_drv.h"
27
28 /*
29 * IOSF sideband, see VLV2_SidebandMsg_HAS.docx and
30 * VLV_VLV2_PUNIT_HAS_0.8.docx
31 */
32
33 /* Standard MMIO read, non-posted */
34 #define SB_MRD_NP 0x00
35 /* Standard MMIO write, non-posted */
36 #define SB_MWR_NP 0x01
37 /* Private register read, double-word addressing, non-posted */
38 #define SB_CRRDDA_NP 0x06
39 /* Private register write, double-word addressing, non-posted */
40 #define SB_CRWRDA_NP 0x07
41
vlv_sideband_rw(struct drm_i915_private * dev_priv,u32 devfn,u32 port,u32 opcode,u32 addr,u32 * val)42 static int vlv_sideband_rw(struct drm_i915_private *dev_priv, u32 devfn,
43 u32 port, u32 opcode, u32 addr, u32 *val)
44 {
45 u32 cmd, be = 0xf, bar = 0;
46 bool is_read = (opcode == SB_MRD_NP || opcode == SB_CRRDDA_NP);
47
48 cmd = (devfn << IOSF_DEVFN_SHIFT) | (opcode << IOSF_OPCODE_SHIFT) |
49 (port << IOSF_PORT_SHIFT) | (be << IOSF_BYTE_ENABLES_SHIFT) |
50 (bar << IOSF_BAR_SHIFT);
51
52 WARN_ON(!mutex_is_locked(&dev_priv->sb_lock));
53
54 if (intel_wait_for_register(dev_priv,
55 VLV_IOSF_DOORBELL_REQ, IOSF_SB_BUSY, 0,
56 5)) {
57 DRM_DEBUG_DRIVER("IOSF sideband idle wait (%s) timed out\n",
58 is_read ? "read" : "write");
59 return -EAGAIN;
60 }
61
62 I915_WRITE(VLV_IOSF_ADDR, addr);
63 I915_WRITE(VLV_IOSF_DATA, is_read ? 0 : *val);
64 I915_WRITE(VLV_IOSF_DOORBELL_REQ, cmd);
65
66 if (intel_wait_for_register(dev_priv,
67 VLV_IOSF_DOORBELL_REQ, IOSF_SB_BUSY, 0,
68 5)) {
69 DRM_DEBUG_DRIVER("IOSF sideband finish wait (%s) timed out\n",
70 is_read ? "read" : "write");
71 return -ETIMEDOUT;
72 }
73
74 if (is_read)
75 *val = I915_READ(VLV_IOSF_DATA);
76
77 return 0;
78 }
79
vlv_punit_read(struct drm_i915_private * dev_priv,u32 addr)80 u32 vlv_punit_read(struct drm_i915_private *dev_priv, u32 addr)
81 {
82 u32 val = 0;
83
84 WARN_ON(!mutex_is_locked(&dev_priv->pcu_lock));
85
86 mutex_lock(&dev_priv->sb_lock);
87 vlv_sideband_rw(dev_priv, PCI_DEVFN(0, 0), IOSF_PORT_PUNIT,
88 SB_CRRDDA_NP, addr, &val);
89 mutex_unlock(&dev_priv->sb_lock);
90
91 return val;
92 }
93
vlv_punit_write(struct drm_i915_private * dev_priv,u32 addr,u32 val)94 int vlv_punit_write(struct drm_i915_private *dev_priv, u32 addr, u32 val)
95 {
96 int err;
97
98 WARN_ON(!mutex_is_locked(&dev_priv->pcu_lock));
99
100 mutex_lock(&dev_priv->sb_lock);
101 err = vlv_sideband_rw(dev_priv, PCI_DEVFN(0, 0), IOSF_PORT_PUNIT,
102 SB_CRWRDA_NP, addr, &val);
103 mutex_unlock(&dev_priv->sb_lock);
104
105 return err;
106 }
107
vlv_bunit_read(struct drm_i915_private * dev_priv,u32 reg)108 u32 vlv_bunit_read(struct drm_i915_private *dev_priv, u32 reg)
109 {
110 u32 val = 0;
111
112 vlv_sideband_rw(dev_priv, PCI_DEVFN(0, 0), IOSF_PORT_BUNIT,
113 SB_CRRDDA_NP, reg, &val);
114
115 return val;
116 }
117
vlv_bunit_write(struct drm_i915_private * dev_priv,u32 reg,u32 val)118 void vlv_bunit_write(struct drm_i915_private *dev_priv, u32 reg, u32 val)
119 {
120 vlv_sideband_rw(dev_priv, PCI_DEVFN(0, 0), IOSF_PORT_BUNIT,
121 SB_CRWRDA_NP, reg, &val);
122 }
123
vlv_nc_read(struct drm_i915_private * dev_priv,u8 addr)124 u32 vlv_nc_read(struct drm_i915_private *dev_priv, u8 addr)
125 {
126 u32 val = 0;
127
128 WARN_ON(!mutex_is_locked(&dev_priv->pcu_lock));
129
130 mutex_lock(&dev_priv->sb_lock);
131 vlv_sideband_rw(dev_priv, PCI_DEVFN(0, 0), IOSF_PORT_NC,
132 SB_CRRDDA_NP, addr, &val);
133 mutex_unlock(&dev_priv->sb_lock);
134
135 return val;
136 }
137
vlv_iosf_sb_read(struct drm_i915_private * dev_priv,u8 port,u32 reg)138 u32 vlv_iosf_sb_read(struct drm_i915_private *dev_priv, u8 port, u32 reg)
139 {
140 u32 val = 0;
141 vlv_sideband_rw(dev_priv, PCI_DEVFN(0, 0), port,
142 SB_CRRDDA_NP, reg, &val);
143 return val;
144 }
145
vlv_iosf_sb_write(struct drm_i915_private * dev_priv,u8 port,u32 reg,u32 val)146 void vlv_iosf_sb_write(struct drm_i915_private *dev_priv,
147 u8 port, u32 reg, u32 val)
148 {
149 vlv_sideband_rw(dev_priv, PCI_DEVFN(0, 0), port,
150 SB_CRWRDA_NP, reg, &val);
151 }
152
vlv_cck_read(struct drm_i915_private * dev_priv,u32 reg)153 u32 vlv_cck_read(struct drm_i915_private *dev_priv, u32 reg)
154 {
155 u32 val = 0;
156 vlv_sideband_rw(dev_priv, PCI_DEVFN(0, 0), IOSF_PORT_CCK,
157 SB_CRRDDA_NP, reg, &val);
158 return val;
159 }
160
vlv_cck_write(struct drm_i915_private * dev_priv,u32 reg,u32 val)161 void vlv_cck_write(struct drm_i915_private *dev_priv, u32 reg, u32 val)
162 {
163 vlv_sideband_rw(dev_priv, PCI_DEVFN(0, 0), IOSF_PORT_CCK,
164 SB_CRWRDA_NP, reg, &val);
165 }
166
vlv_ccu_read(struct drm_i915_private * dev_priv,u32 reg)167 u32 vlv_ccu_read(struct drm_i915_private *dev_priv, u32 reg)
168 {
169 u32 val = 0;
170 vlv_sideband_rw(dev_priv, PCI_DEVFN(0, 0), IOSF_PORT_CCU,
171 SB_CRRDDA_NP, reg, &val);
172 return val;
173 }
174
vlv_ccu_write(struct drm_i915_private * dev_priv,u32 reg,u32 val)175 void vlv_ccu_write(struct drm_i915_private *dev_priv, u32 reg, u32 val)
176 {
177 vlv_sideband_rw(dev_priv, PCI_DEVFN(0, 0), IOSF_PORT_CCU,
178 SB_CRWRDA_NP, reg, &val);
179 }
180
vlv_dpio_read(struct drm_i915_private * dev_priv,enum i915_pipe pipe,int reg)181 u32 vlv_dpio_read(struct drm_i915_private *dev_priv, enum i915_pipe pipe, int reg)
182 {
183 u32 val = 0;
184
185 vlv_sideband_rw(dev_priv, DPIO_DEVFN, DPIO_PHY_IOSF_PORT(DPIO_PHY(pipe)),
186 SB_MRD_NP, reg, &val);
187
188 /*
189 * FIXME: There might be some registers where all 1's is a valid value,
190 * so ideally we should check the register offset instead...
191 */
192 WARN(val == 0xffffffff, "DPIO read pipe %c reg 0x%x == 0x%x\n",
193 pipe_name(pipe), reg, val);
194
195 return val;
196 }
197
vlv_dpio_write(struct drm_i915_private * dev_priv,enum i915_pipe pipe,int reg,u32 val)198 void vlv_dpio_write(struct drm_i915_private *dev_priv, enum i915_pipe pipe, int reg, u32 val)
199 {
200 vlv_sideband_rw(dev_priv, DPIO_DEVFN, DPIO_PHY_IOSF_PORT(DPIO_PHY(pipe)),
201 SB_MWR_NP, reg, &val);
202 }
203
204 /* SBI access */
intel_sbi_read(struct drm_i915_private * dev_priv,u16 reg,enum intel_sbi_destination destination)205 u32 intel_sbi_read(struct drm_i915_private *dev_priv, u16 reg,
206 enum intel_sbi_destination destination)
207 {
208 u32 value = 0;
209 WARN_ON(!mutex_is_locked(&dev_priv->sb_lock));
210
211 if (intel_wait_for_register(dev_priv,
212 SBI_CTL_STAT, SBI_BUSY, 0,
213 100)) {
214 DRM_ERROR("timeout waiting for SBI to become ready\n");
215 return 0;
216 }
217
218 I915_WRITE(SBI_ADDR, (reg << 16));
219 I915_WRITE(SBI_DATA, 0);
220
221 if (destination == SBI_ICLK)
222 value = SBI_CTL_DEST_ICLK | SBI_CTL_OP_CRRD;
223 else
224 value = SBI_CTL_DEST_MPHY | SBI_CTL_OP_IORD;
225 I915_WRITE(SBI_CTL_STAT, value | SBI_BUSY);
226
227 if (intel_wait_for_register(dev_priv,
228 SBI_CTL_STAT,
229 SBI_BUSY,
230 0,
231 100)) {
232 DRM_ERROR("timeout waiting for SBI to complete read\n");
233 return 0;
234 }
235
236 if (I915_READ(SBI_CTL_STAT) & SBI_RESPONSE_FAIL) {
237 DRM_ERROR("error during SBI read of reg %x\n", reg);
238 return 0;
239 }
240
241 return I915_READ(SBI_DATA);
242 }
243
intel_sbi_write(struct drm_i915_private * dev_priv,u16 reg,u32 value,enum intel_sbi_destination destination)244 void intel_sbi_write(struct drm_i915_private *dev_priv, u16 reg, u32 value,
245 enum intel_sbi_destination destination)
246 {
247 u32 tmp;
248
249 WARN_ON(!mutex_is_locked(&dev_priv->sb_lock));
250
251 if (intel_wait_for_register(dev_priv,
252 SBI_CTL_STAT, SBI_BUSY, 0,
253 100)) {
254 DRM_ERROR("timeout waiting for SBI to become ready\n");
255 return;
256 }
257
258 I915_WRITE(SBI_ADDR, (reg << 16));
259 I915_WRITE(SBI_DATA, value);
260
261 if (destination == SBI_ICLK)
262 tmp = SBI_CTL_DEST_ICLK | SBI_CTL_OP_CRWR;
263 else
264 tmp = SBI_CTL_DEST_MPHY | SBI_CTL_OP_IOWR;
265 I915_WRITE(SBI_CTL_STAT, SBI_BUSY | tmp);
266
267 if (intel_wait_for_register(dev_priv,
268 SBI_CTL_STAT,
269 SBI_BUSY,
270 0,
271 100)) {
272 DRM_ERROR("timeout waiting for SBI to complete write\n");
273 return;
274 }
275
276 if (I915_READ(SBI_CTL_STAT) & SBI_RESPONSE_FAIL) {
277 DRM_ERROR("error during SBI write of %x to reg %x\n",
278 value, reg);
279 return;
280 }
281 }
282
vlv_flisdsi_read(struct drm_i915_private * dev_priv,u32 reg)283 u32 vlv_flisdsi_read(struct drm_i915_private *dev_priv, u32 reg)
284 {
285 u32 val = 0;
286 vlv_sideband_rw(dev_priv, DPIO_DEVFN, IOSF_PORT_FLISDSI, SB_CRRDDA_NP,
287 reg, &val);
288 return val;
289 }
290
vlv_flisdsi_write(struct drm_i915_private * dev_priv,u32 reg,u32 val)291 void vlv_flisdsi_write(struct drm_i915_private *dev_priv, u32 reg, u32 val)
292 {
293 vlv_sideband_rw(dev_priv, DPIO_DEVFN, IOSF_PORT_FLISDSI, SB_CRWRDA_NP,
294 reg, &val);
295 }
296