1 /*
2 * Blackfin power management
3 *
4 * Copyright 2006-2009 Analog Devices Inc.
5 *
6 * Licensed under the GPL-2
7 * based on arm/mach-omap/pm.c
8 * Copyright 2001, Cliff Brake <cbrake@accelent.com> and others
9 */
10
11 #include <linux/suspend.h>
12 #include <linux/sched.h>
13 #include <linux/proc_fs.h>
14 #include <linux/slab.h>
15 #include <linux/io.h>
16 #include <linux/irq.h>
17
18 #include <asm/cplb.h>
19 #include <asm/gpio.h>
20 #include <asm/dma.h>
21 #include <asm/dpmc.h>
22
23
bfin_pm_suspend_standby_enter(void)24 void bfin_pm_suspend_standby_enter(void)
25 {
26 bfin_pm_standby_setup();
27
28 #ifdef CONFIG_PM_BFIN_SLEEP_DEEPER
29 sleep_deeper(bfin_sic_iwr[0], bfin_sic_iwr[1], bfin_sic_iwr[2]);
30 #else
31 sleep_mode(bfin_sic_iwr[0], bfin_sic_iwr[1], bfin_sic_iwr[2]);
32 #endif
33
34 bfin_pm_standby_restore();
35
36 #ifdef SIC_IWR0
37 bfin_write_SIC_IWR0(IWR_DISABLE_ALL);
38 # ifdef SIC_IWR1
39 /* BF52x system reset does not properly reset SIC_IWR1 which
40 * will screw up the bootrom as it relies on MDMA0/1 waking it
41 * up from IDLE instructions. See this report for more info:
42 * http://blackfin.uclinux.org/gf/tracker/4323
43 */
44 if (ANOMALY_05000435)
45 bfin_write_SIC_IWR1(IWR_ENABLE(10) | IWR_ENABLE(11));
46 else
47 bfin_write_SIC_IWR1(IWR_DISABLE_ALL);
48 # endif
49 # ifdef SIC_IWR2
50 bfin_write_SIC_IWR2(IWR_DISABLE_ALL);
51 # endif
52 #else
53 bfin_write_SIC_IWR(IWR_DISABLE_ALL);
54 #endif
55 }
56
bf53x_suspend_l1_mem(unsigned char * memptr)57 int bf53x_suspend_l1_mem(unsigned char *memptr)
58 {
59 dma_memcpy_nocache(memptr, (const void *) L1_CODE_START,
60 L1_CODE_LENGTH);
61 dma_memcpy_nocache(memptr + L1_CODE_LENGTH,
62 (const void *) L1_DATA_A_START, L1_DATA_A_LENGTH);
63 dma_memcpy_nocache(memptr + L1_CODE_LENGTH + L1_DATA_A_LENGTH,
64 (const void *) L1_DATA_B_START, L1_DATA_B_LENGTH);
65 memcpy(memptr + L1_CODE_LENGTH + L1_DATA_A_LENGTH +
66 L1_DATA_B_LENGTH, (const void *) L1_SCRATCH_START,
67 L1_SCRATCH_LENGTH);
68
69 return 0;
70 }
71
bf53x_resume_l1_mem(unsigned char * memptr)72 int bf53x_resume_l1_mem(unsigned char *memptr)
73 {
74 dma_memcpy_nocache((void *) L1_CODE_START, memptr, L1_CODE_LENGTH);
75 dma_memcpy_nocache((void *) L1_DATA_A_START, memptr + L1_CODE_LENGTH,
76 L1_DATA_A_LENGTH);
77 dma_memcpy_nocache((void *) L1_DATA_B_START, memptr + L1_CODE_LENGTH +
78 L1_DATA_A_LENGTH, L1_DATA_B_LENGTH);
79 memcpy((void *) L1_SCRATCH_START, memptr + L1_CODE_LENGTH +
80 L1_DATA_A_LENGTH + L1_DATA_B_LENGTH, L1_SCRATCH_LENGTH);
81
82 return 0;
83 }
84
85 #if defined(CONFIG_BFIN_EXTMEM_WRITEBACK) || defined(CONFIG_BFIN_L2_WRITEBACK)
flushinv_all_dcache(void)86 static void flushinv_all_dcache(void)
87 {
88 u32 way, bank, subbank, set;
89 u32 status, addr;
90 u32 dmem_ctl = bfin_read_DMEM_CONTROL();
91
92 for (bank = 0; bank < 2; ++bank) {
93 if (!(dmem_ctl & (1 << (DMC1_P - bank))))
94 continue;
95
96 for (way = 0; way < 2; ++way)
97 for (subbank = 0; subbank < 4; ++subbank)
98 for (set = 0; set < 64; ++set) {
99
100 bfin_write_DTEST_COMMAND(
101 way << 26 |
102 bank << 23 |
103 subbank << 16 |
104 set << 5
105 );
106 CSYNC();
107 status = bfin_read_DTEST_DATA0();
108
109 /* only worry about valid/dirty entries */
110 if ((status & 0x3) != 0x3)
111 continue;
112
113 /* construct the address using the tag */
114 addr = (status & 0xFFFFC800) | (subbank << 12) | (set << 5);
115
116 /* flush it */
117 __asm__ __volatile__("FLUSHINV[%0];" : : "a"(addr));
118 }
119 }
120 }
121 #endif
122
bfin_pm_suspend_mem_enter(void)123 int bfin_pm_suspend_mem_enter(void)
124 {
125 int wakeup, ret;
126
127 unsigned char *memptr = kmalloc(L1_CODE_LENGTH + L1_DATA_A_LENGTH
128 + L1_DATA_B_LENGTH + L1_SCRATCH_LENGTH,
129 GFP_KERNEL);
130
131 if (memptr == NULL) {
132 panic("bf53x_suspend_l1_mem malloc failed");
133 return -ENOMEM;
134 }
135
136 wakeup = bfin_read_VR_CTL() & ~FREQ;
137 wakeup |= SCKELOW;
138
139 #ifdef CONFIG_PM_BFIN_WAKE_PH6
140 wakeup |= PHYWE;
141 #endif
142 #ifdef CONFIG_PM_BFIN_WAKE_GP
143 wakeup |= GPWE;
144 #endif
145
146 ret = blackfin_dma_suspend();
147
148 if (ret) {
149 kfree(memptr);
150 return ret;
151 }
152
153 bfin_gpio_pm_hibernate_suspend();
154
155 #if defined(CONFIG_BFIN_EXTMEM_WRITEBACK) || defined(CONFIG_BFIN_L2_WRITEBACK)
156 flushinv_all_dcache();
157 #endif
158 _disable_dcplb();
159 _disable_icplb();
160 bf53x_suspend_l1_mem(memptr);
161
162 do_hibernate(wakeup | vr_wakeup); /* See you later! */
163
164 bf53x_resume_l1_mem(memptr);
165
166 _enable_icplb();
167 _enable_dcplb();
168
169 bfin_gpio_pm_hibernate_restore();
170 blackfin_dma_resume();
171
172 kfree(memptr);
173
174 return 0;
175 }
176
177 /*
178 * bfin_pm_valid - Tell the PM core that we only support the standby sleep
179 * state
180 * @state: suspend state we're checking.
181 *
182 */
bfin_pm_valid(suspend_state_t state)183 static int bfin_pm_valid(suspend_state_t state)
184 {
185 return (state == PM_SUSPEND_STANDBY
186 #if !(defined(BF533_FAMILY) || defined(CONFIG_BF561))
187 /*
188 * On BF533/2/1:
189 * If we enter Hibernate the SCKE Pin is driven Low,
190 * so that the SDRAM enters Self Refresh Mode.
191 * However when the reset sequence that follows hibernate
192 * state is executed, SCKE is driven High, taking the
193 * SDRAM out of Self Refresh.
194 *
195 * If you reconfigure and access the SDRAM "very quickly",
196 * you are likely to avoid errors, otherwise the SDRAM
197 * start losing its contents.
198 * An external HW workaround is possible using logic gates.
199 */
200 || state == PM_SUSPEND_MEM
201 #endif
202 );
203 }
204
205 /*
206 * bfin_pm_enter - Actually enter a sleep state.
207 * @state: State we're entering.
208 *
209 */
bfin_pm_enter(suspend_state_t state)210 static int bfin_pm_enter(suspend_state_t state)
211 {
212 switch (state) {
213 case PM_SUSPEND_STANDBY:
214 bfin_pm_suspend_standby_enter();
215 break;
216 case PM_SUSPEND_MEM:
217 bfin_pm_suspend_mem_enter();
218 break;
219 default:
220 return -EINVAL;
221 }
222
223 return 0;
224 }
225
226 static const struct platform_suspend_ops bfin_pm_ops = {
227 .enter = bfin_pm_enter,
228 .valid = bfin_pm_valid,
229 };
230
bfin_pm_init(void)231 static int __init bfin_pm_init(void)
232 {
233 suspend_set_ops(&bfin_pm_ops);
234 return 0;
235 }
236
237 __initcall(bfin_pm_init);
238