xref: /openbmc/linux/drivers/gpu/drm/radeon/ci_smc.c (revision cd5d5810) 
1 /*
2  * Copyright 2011 Advanced Micro Devices, Inc.
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 shall be included in
12  * all copies or substantial portions of the Software.
13  *
14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
17  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
18  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20  * OTHER DEALINGS IN THE SOFTWARE.
21  *
22  * Authors: Alex Deucher
23  */
24 
25 #include <linux/firmware.h>
26 #include "drmP.h"
27 #include "radeon.h"
28 #include "cikd.h"
29 #include "ppsmc.h"
30 #include "radeon_ucode.h"
31 
32 static int ci_set_smc_sram_address(struct radeon_device *rdev,
33 				   u32 smc_address, u32 limit)
34 {
35 	if (smc_address & 3)
36 		return -EINVAL;
37 	if ((smc_address + 3) > limit)
38 		return -EINVAL;
39 
40 	WREG32(SMC_IND_INDEX_0, smc_address);
41 	WREG32_P(SMC_IND_ACCESS_CNTL, 0, ~AUTO_INCREMENT_IND_0);
42 
43 	return 0;
44 }
45 
46 int ci_copy_bytes_to_smc(struct radeon_device *rdev,
47 			 u32 smc_start_address,
48 			 const u8 *src, u32 byte_count, u32 limit)
49 {
50 	unsigned long flags;
51 	u32 data, original_data;
52 	u32 addr;
53 	u32 extra_shift;
54 	int ret = 0;
55 
56 	if (smc_start_address & 3)
57 		return -EINVAL;
58 	if ((smc_start_address + byte_count) > limit)
59 		return -EINVAL;
60 
61 	addr = smc_start_address;
62 
63 	spin_lock_irqsave(&rdev->smc_idx_lock, flags);
64 	while (byte_count >= 4) {
65 		/* SMC address space is BE */
66 		data = (src[0] << 24) | (src[1] << 16) | (src[2] << 8) | src[3];
67 
68 		ret = ci_set_smc_sram_address(rdev, addr, limit);
69 		if (ret)
70 			goto done;
71 
72 		WREG32(SMC_IND_DATA_0, data);
73 
74 		src += 4;
75 		byte_count -= 4;
76 		addr += 4;
77 	}
78 
79 	/* RMW for the final bytes */
80 	if (byte_count > 0) {
81 		data = 0;
82 
83 		ret = ci_set_smc_sram_address(rdev, addr, limit);
84 		if (ret)
85 			goto done;
86 
87 		original_data = RREG32(SMC_IND_DATA_0);
88 
89 		extra_shift = 8 * (4 - byte_count);
90 
91 		while (byte_count > 0) {
92 			data = (data << 8) + *src++;
93 			byte_count--;
94 		}
95 
96 		data <<= extra_shift;
97 
98 		data |= (original_data & ~((~0UL) << extra_shift));
99 
100 		ret = ci_set_smc_sram_address(rdev, addr, limit);
101 		if (ret)
102 			goto done;
103 
104 		WREG32(SMC_IND_DATA_0, data);
105 	}
106 
107 done:
108 	spin_unlock_irqrestore(&rdev->smc_idx_lock, flags);
109 
110 	return ret;
111 }
112 
113 void ci_start_smc(struct radeon_device *rdev)
114 {
115 	u32 tmp = RREG32_SMC(SMC_SYSCON_RESET_CNTL);
116 
117 	tmp &= ~RST_REG;
118 	WREG32_SMC(SMC_SYSCON_RESET_CNTL, tmp);
119 }
120 
121 void ci_reset_smc(struct radeon_device *rdev)
122 {
123 	u32 tmp = RREG32_SMC(SMC_SYSCON_RESET_CNTL);
124 
125 	tmp |= RST_REG;
126 	WREG32_SMC(SMC_SYSCON_RESET_CNTL, tmp);
127 }
128 
129 int ci_program_jump_on_start(struct radeon_device *rdev)
130 {
131 	static u8 data[] = { 0xE0, 0x00, 0x80, 0x40 };
132 
133 	return ci_copy_bytes_to_smc(rdev, 0x0, data, 4, sizeof(data)+1);
134 }
135 
136 void ci_stop_smc_clock(struct radeon_device *rdev)
137 {
138 	u32 tmp = RREG32_SMC(SMC_SYSCON_CLOCK_CNTL_0);
139 
140 	tmp |= CK_DISABLE;
141 
142 	WREG32_SMC(SMC_SYSCON_CLOCK_CNTL_0, tmp);
143 }
144 
145 void ci_start_smc_clock(struct radeon_device *rdev)
146 {
147 	u32 tmp = RREG32_SMC(SMC_SYSCON_CLOCK_CNTL_0);
148 
149 	tmp &= ~CK_DISABLE;
150 
151 	WREG32_SMC(SMC_SYSCON_CLOCK_CNTL_0, tmp);
152 }
153 
154 bool ci_is_smc_running(struct radeon_device *rdev)
155 {
156 	u32 clk = RREG32_SMC(SMC_SYSCON_CLOCK_CNTL_0);
157 	u32 pc_c = RREG32_SMC(SMC_PC_C);
158 
159 	if (!(clk & CK_DISABLE) && (0x20100 <= pc_c))
160 		return true;
161 
162 	return false;
163 }
164 
165 PPSMC_Result ci_send_msg_to_smc(struct radeon_device *rdev, PPSMC_Msg msg)
166 {
167 	u32 tmp;
168 	int i;
169 
170 	if (!ci_is_smc_running(rdev))
171 		return PPSMC_Result_Failed;
172 
173 	WREG32(SMC_MESSAGE_0, msg);
174 
175 	for (i = 0; i < rdev->usec_timeout; i++) {
176 		tmp = RREG32(SMC_RESP_0);
177 		if (tmp != 0)
178 			break;
179 		udelay(1);
180 	}
181 	tmp = RREG32(SMC_RESP_0);
182 
183 	return (PPSMC_Result)tmp;
184 }
185 
186 PPSMC_Result ci_wait_for_smc_inactive(struct radeon_device *rdev)
187 {
188 	u32 tmp;
189 	int i;
190 
191 	if (!ci_is_smc_running(rdev))
192 		return PPSMC_Result_OK;
193 
194 	for (i = 0; i < rdev->usec_timeout; i++) {
195                 tmp = RREG32_SMC(SMC_SYSCON_CLOCK_CNTL_0);
196                 if ((tmp & CKEN) == 0)
197 			break;
198                 udelay(1);
199         }
200 
201 	return PPSMC_Result_OK;
202 }
203 
204 int ci_load_smc_ucode(struct radeon_device *rdev, u32 limit)
205 {
206 	unsigned long flags;
207 	u32 ucode_start_address;
208 	u32 ucode_size;
209 	const u8 *src;
210 	u32 data;
211 
212 	if (!rdev->smc_fw)
213 		return -EINVAL;
214 
215 	switch (rdev->family) {
216 	case CHIP_BONAIRE:
217 		ucode_start_address = BONAIRE_SMC_UCODE_START;
218 		ucode_size = BONAIRE_SMC_UCODE_SIZE;
219 		break;
220 	default:
221 		DRM_ERROR("unknown asic in smc ucode loader\n");
222 		BUG();
223 	}
224 
225 	if (ucode_size & 3)
226 		return -EINVAL;
227 
228 	src = (const u8 *)rdev->smc_fw->data;
229 	spin_lock_irqsave(&rdev->smc_idx_lock, flags);
230 	WREG32(SMC_IND_INDEX_0, ucode_start_address);
231 	WREG32_P(SMC_IND_ACCESS_CNTL, AUTO_INCREMENT_IND_0, ~AUTO_INCREMENT_IND_0);
232 	while (ucode_size >= 4) {
233 		/* SMC address space is BE */
234 		data = (src[0] << 24) | (src[1] << 16) | (src[2] << 8) | src[3];
235 
236 		WREG32(SMC_IND_DATA_0, data);
237 
238 		src += 4;
239 		ucode_size -= 4;
240 	}
241 	WREG32_P(SMC_IND_ACCESS_CNTL, 0, ~AUTO_INCREMENT_IND_0);
242 	spin_unlock_irqrestore(&rdev->smc_idx_lock, flags);
243 
244 	return 0;
245 }
246 
247 int ci_read_smc_sram_dword(struct radeon_device *rdev,
248 			   u32 smc_address, u32 *value, u32 limit)
249 {
250 	unsigned long flags;
251 	int ret;
252 
253 	spin_lock_irqsave(&rdev->smc_idx_lock, flags);
254 	ret = ci_set_smc_sram_address(rdev, smc_address, limit);
255 	if (ret == 0)
256 		*value = RREG32(SMC_IND_DATA_0);
257 	spin_unlock_irqrestore(&rdev->smc_idx_lock, flags);
258 
259 	return ret;
260 }
261 
262 int ci_write_smc_sram_dword(struct radeon_device *rdev,
263 			    u32 smc_address, u32 value, u32 limit)
264 {
265 	unsigned long flags;
266 	int ret;
267 
268 	spin_lock_irqsave(&rdev->smc_idx_lock, flags);
269 	ret = ci_set_smc_sram_address(rdev, smc_address, limit);
270 	if (ret == 0)
271 		WREG32(SMC_IND_DATA_0, value);
272 	spin_unlock_irqrestore(&rdev->smc_idx_lock, flags);
273 
274 	return ret;
275 }
276