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
42static 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->dpio_lock));
53
54	if (wait_for((I915_READ(VLV_IOSF_DOORBELL_REQ) & IOSF_SB_BUSY) == 0, 5)) {
55		DRM_DEBUG_DRIVER("IOSF sideband idle wait (%s) timed out\n",
56				 is_read ? "read" : "write");
57		return -EAGAIN;
58	}
59
60	I915_WRITE(VLV_IOSF_ADDR, addr);
61	if (!is_read)
62		I915_WRITE(VLV_IOSF_DATA, *val);
63	I915_WRITE(VLV_IOSF_DOORBELL_REQ, cmd);
64
65	if (wait_for((I915_READ(VLV_IOSF_DOORBELL_REQ) & IOSF_SB_BUSY) == 0, 5)) {
66		DRM_DEBUG_DRIVER("IOSF sideband finish wait (%s) timed out\n",
67				 is_read ? "read" : "write");
68		return -ETIMEDOUT;
69	}
70
71	if (is_read)
72		*val = I915_READ(VLV_IOSF_DATA);
73	I915_WRITE(VLV_IOSF_DATA, 0);
74
75	return 0;
76}
77
78u32 vlv_punit_read(struct drm_i915_private *dev_priv, u32 addr)
79{
80	u32 val = 0;
81
82	WARN_ON(!mutex_is_locked(&dev_priv->rps.hw_lock));
83
84	mutex_lock(&dev_priv->dpio_lock);
85	vlv_sideband_rw(dev_priv, PCI_DEVFN(0, 0), IOSF_PORT_PUNIT,
86			SB_CRRDDA_NP, addr, &val);
87	mutex_unlock(&dev_priv->dpio_lock);
88
89	return val;
90}
91
92void vlv_punit_write(struct drm_i915_private *dev_priv, u32 addr, u32 val)
93{
94	WARN_ON(!mutex_is_locked(&dev_priv->rps.hw_lock));
95
96	mutex_lock(&dev_priv->dpio_lock);
97	vlv_sideband_rw(dev_priv, PCI_DEVFN(0, 0), IOSF_PORT_PUNIT,
98			SB_CRWRDA_NP, addr, &val);
99	mutex_unlock(&dev_priv->dpio_lock);
100}
101
102u32 vlv_bunit_read(struct drm_i915_private *dev_priv, u32 reg)
103{
104	u32 val = 0;
105
106	vlv_sideband_rw(dev_priv, PCI_DEVFN(0, 0), IOSF_PORT_BUNIT,
107			SB_CRRDDA_NP, reg, &val);
108
109	return val;
110}
111
112void vlv_bunit_write(struct drm_i915_private *dev_priv, u32 reg, u32 val)
113{
114	vlv_sideband_rw(dev_priv, PCI_DEVFN(0, 0), IOSF_PORT_BUNIT,
115			SB_CRWRDA_NP, reg, &val);
116}
117
118u32 vlv_nc_read(struct drm_i915_private *dev_priv, u8 addr)
119{
120	u32 val = 0;
121
122	WARN_ON(!mutex_is_locked(&dev_priv->rps.hw_lock));
123
124	mutex_lock(&dev_priv->dpio_lock);
125	vlv_sideband_rw(dev_priv, PCI_DEVFN(0, 0), IOSF_PORT_NC,
126			SB_CRRDDA_NP, addr, &val);
127	mutex_unlock(&dev_priv->dpio_lock);
128
129	return val;
130}
131
132u32 vlv_gpio_nc_read(struct drm_i915_private *dev_priv, u32 reg)
133{
134	u32 val = 0;
135	vlv_sideband_rw(dev_priv, PCI_DEVFN(0, 0), IOSF_PORT_GPIO_NC,
136			SB_CRRDDA_NP, reg, &val);
137	return val;
138}
139
140void vlv_gpio_nc_write(struct drm_i915_private *dev_priv, u32 reg, u32 val)
141{
142	vlv_sideband_rw(dev_priv, PCI_DEVFN(0, 0), IOSF_PORT_GPIO_NC,
143			SB_CRWRDA_NP, reg, &val);
144}
145
146u32 vlv_cck_read(struct drm_i915_private *dev_priv, u32 reg)
147{
148	u32 val = 0;
149	vlv_sideband_rw(dev_priv, PCI_DEVFN(0, 0), IOSF_PORT_CCK,
150			SB_CRRDDA_NP, reg, &val);
151	return val;
152}
153
154void vlv_cck_write(struct drm_i915_private *dev_priv, u32 reg, u32 val)
155{
156	vlv_sideband_rw(dev_priv, PCI_DEVFN(0, 0), IOSF_PORT_CCK,
157			SB_CRWRDA_NP, reg, &val);
158}
159
160u32 vlv_ccu_read(struct drm_i915_private *dev_priv, u32 reg)
161{
162	u32 val = 0;
163	vlv_sideband_rw(dev_priv, PCI_DEVFN(0, 0), IOSF_PORT_CCU,
164			SB_CRRDDA_NP, reg, &val);
165	return val;
166}
167
168void vlv_ccu_write(struct drm_i915_private *dev_priv, u32 reg, u32 val)
169{
170	vlv_sideband_rw(dev_priv, PCI_DEVFN(0, 0), IOSF_PORT_CCU,
171			SB_CRWRDA_NP, reg, &val);
172}
173
174u32 vlv_gps_core_read(struct drm_i915_private *dev_priv, u32 reg)
175{
176	u32 val = 0;
177	vlv_sideband_rw(dev_priv, PCI_DEVFN(0, 0), IOSF_PORT_GPS_CORE,
178			SB_CRRDDA_NP, reg, &val);
179	return val;
180}
181
182void vlv_gps_core_write(struct drm_i915_private *dev_priv, u32 reg, u32 val)
183{
184	vlv_sideband_rw(dev_priv, PCI_DEVFN(0, 0), IOSF_PORT_GPS_CORE,
185			SB_CRWRDA_NP, reg, &val);
186}
187
188u32 vlv_dpio_read(struct drm_i915_private *dev_priv, enum pipe pipe, int reg)
189{
190	u32 val = 0;
191
192	vlv_sideband_rw(dev_priv, DPIO_DEVFN, DPIO_PHY_IOSF_PORT(DPIO_PHY(pipe)),
193			SB_MRD_NP, reg, &val);
194
195	/*
196	 * FIXME: There might be some registers where all 1's is a valid value,
197	 * so ideally we should check the register offset instead...
198	 */
199	WARN(val == 0xffffffff, "DPIO read pipe %c reg 0x%x == 0x%x\n",
200	     pipe_name(pipe), reg, val);
201
202	return val;
203}
204
205void vlv_dpio_write(struct drm_i915_private *dev_priv, enum pipe pipe, int reg, u32 val)
206{
207	vlv_sideband_rw(dev_priv, DPIO_DEVFN, DPIO_PHY_IOSF_PORT(DPIO_PHY(pipe)),
208			SB_MWR_NP, reg, &val);
209}
210
211/* SBI access */
212u32 intel_sbi_read(struct drm_i915_private *dev_priv, u16 reg,
213		   enum intel_sbi_destination destination)
214{
215	u32 value = 0;
216	WARN_ON(!mutex_is_locked(&dev_priv->dpio_lock));
217
218	if (wait_for((I915_READ(SBI_CTL_STAT) & SBI_BUSY) == 0,
219				100)) {
220		DRM_ERROR("timeout waiting for SBI to become ready\n");
221		return 0;
222	}
223
224	I915_WRITE(SBI_ADDR, (reg << 16));
225
226	if (destination == SBI_ICLK)
227		value = SBI_CTL_DEST_ICLK | SBI_CTL_OP_CRRD;
228	else
229		value = SBI_CTL_DEST_MPHY | SBI_CTL_OP_IORD;
230	I915_WRITE(SBI_CTL_STAT, value | SBI_BUSY);
231
232	if (wait_for((I915_READ(SBI_CTL_STAT) & (SBI_BUSY | SBI_RESPONSE_FAIL)) == 0,
233				100)) {
234		DRM_ERROR("timeout waiting for SBI to complete read transaction\n");
235		return 0;
236	}
237
238	return I915_READ(SBI_DATA);
239}
240
241void intel_sbi_write(struct drm_i915_private *dev_priv, u16 reg, u32 value,
242		     enum intel_sbi_destination destination)
243{
244	u32 tmp;
245
246	WARN_ON(!mutex_is_locked(&dev_priv->dpio_lock));
247
248	if (wait_for((I915_READ(SBI_CTL_STAT) & SBI_BUSY) == 0,
249				100)) {
250		DRM_ERROR("timeout waiting for SBI to become ready\n");
251		return;
252	}
253
254	I915_WRITE(SBI_ADDR, (reg << 16));
255	I915_WRITE(SBI_DATA, value);
256
257	if (destination == SBI_ICLK)
258		tmp = SBI_CTL_DEST_ICLK | SBI_CTL_OP_CRWR;
259	else
260		tmp = SBI_CTL_DEST_MPHY | SBI_CTL_OP_IOWR;
261	I915_WRITE(SBI_CTL_STAT, SBI_BUSY | tmp);
262
263	if (wait_for((I915_READ(SBI_CTL_STAT) & (SBI_BUSY | SBI_RESPONSE_FAIL)) == 0,
264				100)) {
265		DRM_ERROR("timeout waiting for SBI to complete write transaction\n");
266		return;
267	}
268}
269
270u32 vlv_flisdsi_read(struct drm_i915_private *dev_priv, u32 reg)
271{
272	u32 val = 0;
273	vlv_sideband_rw(dev_priv, DPIO_DEVFN, IOSF_PORT_FLISDSI, SB_CRRDDA_NP,
274			reg, &val);
275	return val;
276}
277
278void vlv_flisdsi_write(struct drm_i915_private *dev_priv, u32 reg, u32 val)
279{
280	vlv_sideband_rw(dev_priv, DPIO_DEVFN, IOSF_PORT_FLISDSI, SB_CRWRDA_NP,
281			reg, &val);
282}
283