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df595746 AH |
1 | /* |
2 | * Copyright 2014 Freescale Semiconductor, Inc. | |
3 | * | |
4 | * The code contained herein is licensed under the GNU General Public | |
5 | * License. You may obtain a copy of the GNU General Public License | |
6 | * Version 2 or later at the following locations: | |
7 | * | |
8 | * http://www.opensource.org/licenses/gpl-license.html | |
9 | * http://www.gnu.org/copyleft/gpl.html | |
10 | */ | |
11 | ||
12 | #include <linux/linkage.h> | |
6ebbf2ce | 13 | #include <asm/assembler.h> |
c356bdb4 | 14 | #include <asm/asm-offsets.h> |
df595746 AH |
15 | #include <asm/hardware/cache-l2x0.h> |
16 | #include "hardware.h" | |
17 | ||
18 | /* | |
19 | * ==================== low level suspend ==================== | |
20 | * | |
21 | * Better to follow below rules to use ARM registers: | |
22 | * r0: pm_info structure address; | |
23 | * r1 ~ r4: for saving pm_info members; | |
24 | * r5 ~ r10: free registers; | |
25 | * r11: io base address. | |
26 | * | |
27 | * suspend ocram space layout: | |
28 | * ======================== high address ====================== | |
29 | * . | |
30 | * . | |
31 | * . | |
32 | * ^ | |
33 | * ^ | |
34 | * ^ | |
35 | * imx6_suspend code | |
36 | * PM_INFO structure(imx6_cpu_pm_info) | |
37 | * ======================== low address ======================= | |
38 | */ | |
39 | ||
40 | /* | |
41 | * Below offsets are based on struct imx6_cpu_pm_info | |
42 | * which defined in arch/arm/mach-imx/pm-imx6q.c, this | |
43 | * structure contains necessary pm info for low level | |
44 | * suspend related code. | |
45 | */ | |
46 | #define PM_INFO_PBASE_OFFSET 0x0 | |
47 | #define PM_INFO_RESUME_ADDR_OFFSET 0x4 | |
48 | #define PM_INFO_CPU_TYPE_OFFSET 0x8 | |
49 | #define PM_INFO_PM_INFO_SIZE_OFFSET 0xC | |
50 | #define PM_INFO_MX6Q_MMDC_P_OFFSET 0x10 | |
51 | #define PM_INFO_MX6Q_MMDC_V_OFFSET 0x14 | |
52 | #define PM_INFO_MX6Q_SRC_P_OFFSET 0x18 | |
53 | #define PM_INFO_MX6Q_SRC_V_OFFSET 0x1C | |
54 | #define PM_INFO_MX6Q_IOMUXC_P_OFFSET 0x20 | |
55 | #define PM_INFO_MX6Q_IOMUXC_V_OFFSET 0x24 | |
56 | #define PM_INFO_MX6Q_CCM_P_OFFSET 0x28 | |
57 | #define PM_INFO_MX6Q_CCM_V_OFFSET 0x2C | |
58 | #define PM_INFO_MX6Q_GPC_P_OFFSET 0x30 | |
59 | #define PM_INFO_MX6Q_GPC_V_OFFSET 0x34 | |
60 | #define PM_INFO_MX6Q_L2_P_OFFSET 0x38 | |
61 | #define PM_INFO_MX6Q_L2_V_OFFSET 0x3C | |
62 | #define PM_INFO_MMDC_IO_NUM_OFFSET 0x40 | |
63 | #define PM_INFO_MMDC_IO_VAL_OFFSET 0x44 | |
64 | ||
65 | #define MX6Q_SRC_GPR1 0x20 | |
66 | #define MX6Q_SRC_GPR2 0x24 | |
67 | #define MX6Q_MMDC_MAPSR 0x404 | |
64b08681 | 68 | #define MX6Q_MMDC_MPDGCTRL0 0x83c |
df595746 AH |
69 | #define MX6Q_GPC_IMR1 0x08 |
70 | #define MX6Q_GPC_IMR2 0x0c | |
71 | #define MX6Q_GPC_IMR3 0x10 | |
72 | #define MX6Q_GPC_IMR4 0x14 | |
73 | #define MX6Q_CCM_CCR 0x0 | |
74 | ||
75 | .align 3 | |
76 | ||
77 | .macro sync_l2_cache | |
78 | ||
79 | /* sync L2 cache to drain L2's buffers to DRAM. */ | |
80 | #ifdef CONFIG_CACHE_L2X0 | |
81 | ldr r11, [r0, #PM_INFO_MX6Q_L2_V_OFFSET] | |
82 | mov r6, #0x0 | |
83 | str r6, [r11, #L2X0_CACHE_SYNC] | |
84 | 1: | |
85 | ldr r6, [r11, #L2X0_CACHE_SYNC] | |
86 | ands r6, r6, #0x1 | |
87 | bne 1b | |
88 | #endif | |
89 | ||
90 | .endm | |
91 | ||
92 | .macro resume_mmdc | |
93 | ||
94 | /* restore MMDC IO */ | |
95 | cmp r5, #0x0 | |
96 | ldreq r11, [r0, #PM_INFO_MX6Q_IOMUXC_V_OFFSET] | |
97 | ldrne r11, [r0, #PM_INFO_MX6Q_IOMUXC_P_OFFSET] | |
98 | ||
99 | ldr r6, [r0, #PM_INFO_MMDC_IO_NUM_OFFSET] | |
100 | ldr r7, =PM_INFO_MMDC_IO_VAL_OFFSET | |
101 | add r7, r7, r0 | |
102 | 1: | |
103 | ldr r8, [r7], #0x4 | |
104 | ldr r9, [r7], #0x4 | |
105 | str r9, [r11, r8] | |
106 | subs r6, r6, #0x1 | |
107 | bne 1b | |
108 | ||
109 | cmp r5, #0x0 | |
110 | ldreq r11, [r0, #PM_INFO_MX6Q_MMDC_V_OFFSET] | |
111 | ldrne r11, [r0, #PM_INFO_MX6Q_MMDC_P_OFFSET] | |
112 | ||
64b08681 AH |
113 | cmp r3, #MXC_CPU_IMX6SL |
114 | bne 4f | |
115 | ||
116 | /* reset read FIFO, RST_RD_FIFO */ | |
117 | ldr r7, =MX6Q_MMDC_MPDGCTRL0 | |
118 | ldr r6, [r11, r7] | |
119 | orr r6, r6, #(1 << 31) | |
120 | str r6, [r11, r7] | |
121 | 2: | |
122 | ldr r6, [r11, r7] | |
123 | ands r6, r6, #(1 << 31) | |
124 | bne 2b | |
125 | ||
126 | /* reset FIFO a second time */ | |
127 | ldr r6, [r11, r7] | |
128 | orr r6, r6, #(1 << 31) | |
129 | str r6, [r11, r7] | |
130 | 3: | |
131 | ldr r6, [r11, r7] | |
132 | ands r6, r6, #(1 << 31) | |
133 | bne 3b | |
134 | 4: | |
df595746 AH |
135 | /* let DDR out of self-refresh */ |
136 | ldr r7, [r11, #MX6Q_MMDC_MAPSR] | |
137 | bic r7, r7, #(1 << 21) | |
138 | str r7, [r11, #MX6Q_MMDC_MAPSR] | |
64b08681 | 139 | 5: |
df595746 AH |
140 | ldr r7, [r11, #MX6Q_MMDC_MAPSR] |
141 | ands r7, r7, #(1 << 25) | |
64b08681 | 142 | bne 5b |
df595746 AH |
143 | |
144 | /* enable DDR auto power saving */ | |
145 | ldr r7, [r11, #MX6Q_MMDC_MAPSR] | |
146 | bic r7, r7, #0x1 | |
147 | str r7, [r11, #MX6Q_MMDC_MAPSR] | |
148 | ||
149 | .endm | |
150 | ||
151 | ENTRY(imx6_suspend) | |
152 | ldr r1, [r0, #PM_INFO_PBASE_OFFSET] | |
153 | ldr r2, [r0, #PM_INFO_RESUME_ADDR_OFFSET] | |
154 | ldr r3, [r0, #PM_INFO_CPU_TYPE_OFFSET] | |
155 | ldr r4, [r0, #PM_INFO_PM_INFO_SIZE_OFFSET] | |
156 | ||
157 | /* | |
158 | * counting the resume address in iram | |
159 | * to set it in SRC register. | |
160 | */ | |
161 | ldr r6, =imx6_suspend | |
162 | ldr r7, =resume | |
163 | sub r7, r7, r6 | |
164 | add r8, r1, r4 | |
165 | add r9, r8, r7 | |
166 | ||
167 | /* | |
168 | * make sure TLB contain the addr we want, | |
169 | * as we will access them after MMDC IO floated. | |
170 | */ | |
171 | ||
172 | ldr r11, [r0, #PM_INFO_MX6Q_CCM_V_OFFSET] | |
173 | ldr r6, [r11, #0x0] | |
174 | ldr r11, [r0, #PM_INFO_MX6Q_GPC_V_OFFSET] | |
175 | ldr r6, [r11, #0x0] | |
59d05b51 SG |
176 | ldr r11, [r0, #PM_INFO_MX6Q_IOMUXC_V_OFFSET] |
177 | ldr r6, [r11, #0x0] | |
df595746 AH |
178 | |
179 | /* use r11 to store the IO address */ | |
180 | ldr r11, [r0, #PM_INFO_MX6Q_SRC_V_OFFSET] | |
181 | /* store physical resume addr and pm_info address. */ | |
182 | str r9, [r11, #MX6Q_SRC_GPR1] | |
183 | str r1, [r11, #MX6Q_SRC_GPR2] | |
184 | ||
185 | /* need to sync L2 cache before DSM. */ | |
186 | sync_l2_cache | |
187 | ||
188 | ldr r11, [r0, #PM_INFO_MX6Q_MMDC_V_OFFSET] | |
189 | /* | |
190 | * put DDR explicitly into self-refresh and | |
191 | * disable automatic power savings. | |
192 | */ | |
193 | ldr r7, [r11, #MX6Q_MMDC_MAPSR] | |
194 | orr r7, r7, #0x1 | |
195 | str r7, [r11, #MX6Q_MMDC_MAPSR] | |
196 | ||
197 | /* make the DDR explicitly enter self-refresh. */ | |
198 | ldr r7, [r11, #MX6Q_MMDC_MAPSR] | |
199 | orr r7, r7, #(1 << 21) | |
200 | str r7, [r11, #MX6Q_MMDC_MAPSR] | |
201 | ||
202 | poll_dvfs_set: | |
203 | ldr r7, [r11, #MX6Q_MMDC_MAPSR] | |
204 | ands r7, r7, #(1 << 25) | |
205 | beq poll_dvfs_set | |
206 | ||
207 | ldr r11, [r0, #PM_INFO_MX6Q_IOMUXC_V_OFFSET] | |
208 | ldr r6, =0x0 | |
209 | ldr r7, [r0, #PM_INFO_MMDC_IO_NUM_OFFSET] | |
210 | ldr r8, =PM_INFO_MMDC_IO_VAL_OFFSET | |
211 | add r8, r8, r0 | |
64b08681 AH |
212 | /* i.MX6SL's last 3 IOs need special setting */ |
213 | cmp r3, #MXC_CPU_IMX6SL | |
214 | subeq r7, r7, #0x3 | |
df595746 AH |
215 | set_mmdc_io_lpm: |
216 | ldr r9, [r8], #0x8 | |
217 | str r6, [r11, r9] | |
218 | subs r7, r7, #0x1 | |
219 | bne set_mmdc_io_lpm | |
220 | ||
64b08681 AH |
221 | cmp r3, #MXC_CPU_IMX6SL |
222 | bne set_mmdc_io_lpm_done | |
223 | ldr r6, =0x1000 | |
224 | ldr r9, [r8], #0x8 | |
225 | str r6, [r11, r9] | |
226 | ldr r9, [r8], #0x8 | |
227 | str r6, [r11, r9] | |
228 | ldr r6, =0x80000 | |
229 | ldr r9, [r8] | |
230 | str r6, [r11, r9] | |
231 | set_mmdc_io_lpm_done: | |
232 | ||
df595746 AH |
233 | /* |
234 | * mask all GPC interrupts before | |
235 | * enabling the RBC counters to | |
236 | * avoid the counter starting too | |
237 | * early if an interupt is already | |
238 | * pending. | |
239 | */ | |
240 | ldr r11, [r0, #PM_INFO_MX6Q_GPC_V_OFFSET] | |
241 | ldr r6, [r11, #MX6Q_GPC_IMR1] | |
242 | ldr r7, [r11, #MX6Q_GPC_IMR2] | |
243 | ldr r8, [r11, #MX6Q_GPC_IMR3] | |
244 | ldr r9, [r11, #MX6Q_GPC_IMR4] | |
245 | ||
246 | ldr r10, =0xffffffff | |
247 | str r10, [r11, #MX6Q_GPC_IMR1] | |
248 | str r10, [r11, #MX6Q_GPC_IMR2] | |
249 | str r10, [r11, #MX6Q_GPC_IMR3] | |
250 | str r10, [r11, #MX6Q_GPC_IMR4] | |
251 | ||
252 | /* | |
253 | * enable the RBC bypass counter here | |
254 | * to hold off the interrupts. RBC counter | |
255 | * = 32 (1ms), Minimum RBC delay should be | |
256 | * 400us for the analog LDOs to power down. | |
257 | */ | |
258 | ldr r11, [r0, #PM_INFO_MX6Q_CCM_V_OFFSET] | |
259 | ldr r10, [r11, #MX6Q_CCM_CCR] | |
260 | bic r10, r10, #(0x3f << 21) | |
261 | orr r10, r10, #(0x20 << 21) | |
262 | str r10, [r11, #MX6Q_CCM_CCR] | |
263 | ||
264 | /* enable the counter. */ | |
265 | ldr r10, [r11, #MX6Q_CCM_CCR] | |
266 | orr r10, r10, #(0x1 << 27) | |
267 | str r10, [r11, #MX6Q_CCM_CCR] | |
268 | ||
269 | /* unmask all the GPC interrupts. */ | |
270 | ldr r11, [r0, #PM_INFO_MX6Q_GPC_V_OFFSET] | |
271 | str r6, [r11, #MX6Q_GPC_IMR1] | |
272 | str r7, [r11, #MX6Q_GPC_IMR2] | |
273 | str r8, [r11, #MX6Q_GPC_IMR3] | |
274 | str r9, [r11, #MX6Q_GPC_IMR4] | |
275 | ||
276 | /* | |
277 | * now delay for a short while (3usec) | |
278 | * ARM is at 1GHz at this point | |
279 | * so a short loop should be enough. | |
280 | * this delay is required to ensure that | |
281 | * the RBC counter can start counting in | |
282 | * case an interrupt is already pending | |
283 | * or in case an interrupt arrives just | |
284 | * as ARM is about to assert DSM_request. | |
285 | */ | |
286 | ldr r6, =2000 | |
287 | rbc_loop: | |
288 | subs r6, r6, #0x1 | |
289 | bne rbc_loop | |
290 | ||
291 | /* Zzz, enter stop mode */ | |
292 | wfi | |
293 | nop | |
294 | nop | |
295 | nop | |
296 | nop | |
297 | ||
298 | /* | |
299 | * run to here means there is pending | |
300 | * wakeup source, system should auto | |
301 | * resume, we need to restore MMDC IO first | |
302 | */ | |
303 | mov r5, #0x0 | |
304 | resume_mmdc | |
305 | ||
306 | /* return to suspend finish */ | |
6ebbf2ce | 307 | ret lr |
df595746 AH |
308 | |
309 | resume: | |
310 | /* invalidate L1 I-cache first */ | |
311 | mov r6, #0x0 | |
312 | mcr p15, 0, r6, c7, c5, 0 | |
313 | mcr p15, 0, r6, c7, c5, 6 | |
314 | /* enable the Icache and branch prediction */ | |
315 | mov r6, #0x1800 | |
316 | mcr p15, 0, r6, c1, c0, 0 | |
317 | isb | |
318 | ||
319 | /* get physical resume address from pm_info. */ | |
320 | ldr lr, [r0, #PM_INFO_RESUME_ADDR_OFFSET] | |
321 | /* clear core0's entry and parameter */ | |
322 | ldr r11, [r0, #PM_INFO_MX6Q_SRC_P_OFFSET] | |
323 | mov r7, #0x0 | |
324 | str r7, [r11, #MX6Q_SRC_GPR1] | |
325 | str r7, [r11, #MX6Q_SRC_GPR2] | |
326 | ||
64b08681 | 327 | ldr r3, [r0, #PM_INFO_CPU_TYPE_OFFSET] |
df595746 AH |
328 | mov r5, #0x1 |
329 | resume_mmdc | |
330 | ||
6ebbf2ce | 331 | ret lr |
df595746 | 332 | ENDPROC(imx6_suspend) |
c356bdb4 SG |
333 | |
334 | /* | |
335 | * The following code must assume it is running from physical address | |
336 | * where absolute virtual addresses to the data section have to be | |
337 | * turned into relative ones. | |
338 | */ | |
339 | ||
c356bdb4 SG |
340 | ENTRY(v7_cpu_resume) |
341 | bl v7_invalidate_l1 | |
f5a5f430 RK |
342 | #ifdef CONFIG_CACHE_L2X0 |
343 | bl l2c310_early_resume | |
344 | #endif | |
c356bdb4 SG |
345 | b cpu_resume |
346 | ENDPROC(v7_cpu_resume) |