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Linux/arch/powerpc/platforms/83xx/suspend.c

  1 /*
  2  * MPC83xx suspend support
  3  *
  4  * Author: Scott Wood <scottwood@freescale.com>
  5  *
  6  * Copyright (c) 2006-2007 Freescale Semiconductor, Inc.
  7  *
  8  * This program is free software; you can redistribute it and/or modify it
  9  * under the terms of the GNU General Public License version 2 as published
 10  * by the Free Software Foundation.
 11  */
 12 
 13 #include <linux/pm.h>
 14 #include <linux/types.h>
 15 #include <linux/ioport.h>
 16 #include <linux/interrupt.h>
 17 #include <linux/wait.h>
 18 #include <linux/kthread.h>
 19 #include <linux/freezer.h>
 20 #include <linux/suspend.h>
 21 #include <linux/fsl_devices.h>
 22 #include <linux/of_address.h>
 23 #include <linux/of_irq.h>
 24 #include <linux/of_platform.h>
 25 #include <linux/export.h>
 26 
 27 #include <asm/reg.h>
 28 #include <asm/io.h>
 29 #include <asm/time.h>
 30 #include <asm/mpc6xx.h>
 31 #include <asm/switch_to.h>
 32 
 33 #include <sysdev/fsl_soc.h>
 34 
 35 #define PMCCR1_NEXT_STATE       0x0C /* Next state for power management */
 36 #define PMCCR1_NEXT_STATE_SHIFT 2
 37 #define PMCCR1_CURR_STATE       0x03 /* Current state for power management*/
 38 #define IMMR_SYSCR_OFFSET       0x100
 39 #define IMMR_RCW_OFFSET         0x900
 40 #define RCW_PCI_HOST            0x80000000
 41 
 42 void mpc83xx_enter_deep_sleep(phys_addr_t immrbase);
 43 
 44 struct mpc83xx_pmc {
 45         u32 config;
 46 #define PMCCR_DLPEN 2 /* DDR SDRAM low power enable */
 47 #define PMCCR_SLPEN 1 /* System low power enable */
 48 
 49         u32 event;
 50         u32 mask;
 51 /* All but PMCI are deep-sleep only */
 52 #define PMCER_GPIO   0x100
 53 #define PMCER_PCI    0x080
 54 #define PMCER_USB    0x040
 55 #define PMCER_ETSEC1 0x020
 56 #define PMCER_ETSEC2 0x010
 57 #define PMCER_TIMER  0x008
 58 #define PMCER_INT1   0x004
 59 #define PMCER_INT2   0x002
 60 #define PMCER_PMCI   0x001
 61 #define PMCER_ALL    0x1FF
 62 
 63         /* deep-sleep only */
 64         u32 config1;
 65 #define PMCCR1_USE_STATE  0x80000000
 66 #define PMCCR1_PME_EN     0x00000080
 67 #define PMCCR1_ASSERT_PME 0x00000040
 68 #define PMCCR1_POWER_OFF  0x00000020
 69 
 70         /* deep-sleep only */
 71         u32 config2;
 72 };
 73 
 74 struct mpc83xx_rcw {
 75         u32 rcwlr;
 76         u32 rcwhr;
 77 };
 78 
 79 struct mpc83xx_clock {
 80         u32 spmr;
 81         u32 occr;
 82         u32 sccr;
 83 };
 84 
 85 struct mpc83xx_syscr {
 86         __be32 sgprl;
 87         __be32 sgprh;
 88         __be32 spridr;
 89         __be32 :32;
 90         __be32 spcr;
 91         __be32 sicrl;
 92         __be32 sicrh;
 93 };
 94 
 95 struct mpc83xx_saved {
 96         u32 sicrl;
 97         u32 sicrh;
 98         u32 sccr;
 99 };
100 
101 struct pmc_type {
102         int has_deep_sleep;
103 };
104 
105 static struct platform_device *pmc_dev;
106 static int has_deep_sleep, deep_sleeping;
107 static int pmc_irq;
108 static struct mpc83xx_pmc __iomem *pmc_regs;
109 static struct mpc83xx_clock __iomem *clock_regs;
110 static struct mpc83xx_syscr __iomem *syscr_regs;
111 static struct mpc83xx_saved saved_regs;
112 static int is_pci_agent, wake_from_pci;
113 static phys_addr_t immrbase;
114 static int pci_pm_state;
115 static DECLARE_WAIT_QUEUE_HEAD(agent_wq);
116 
117 int fsl_deep_sleep(void)
118 {
119         return deep_sleeping;
120 }
121 EXPORT_SYMBOL(fsl_deep_sleep);
122 
123 static int mpc83xx_change_state(void)
124 {
125         u32 curr_state;
126         u32 reg_cfg1 = in_be32(&pmc_regs->config1);
127 
128         if (is_pci_agent) {
129                 pci_pm_state = (reg_cfg1 & PMCCR1_NEXT_STATE) >>
130                                PMCCR1_NEXT_STATE_SHIFT;
131                 curr_state = reg_cfg1 & PMCCR1_CURR_STATE;
132 
133                 if (curr_state != pci_pm_state) {
134                         reg_cfg1 &= ~PMCCR1_CURR_STATE;
135                         reg_cfg1 |= pci_pm_state;
136                         out_be32(&pmc_regs->config1, reg_cfg1);
137 
138                         wake_up(&agent_wq);
139                         return 1;
140                 }
141         }
142 
143         return 0;
144 }
145 
146 static irqreturn_t pmc_irq_handler(int irq, void *dev_id)
147 {
148         u32 event = in_be32(&pmc_regs->event);
149         int ret = IRQ_NONE;
150 
151         if (mpc83xx_change_state())
152                 ret = IRQ_HANDLED;
153 
154         if (event) {
155                 out_be32(&pmc_regs->event, event);
156                 ret = IRQ_HANDLED;
157         }
158 
159         return ret;
160 }
161 
162 static void mpc83xx_suspend_restore_regs(void)
163 {
164         out_be32(&syscr_regs->sicrl, saved_regs.sicrl);
165         out_be32(&syscr_regs->sicrh, saved_regs.sicrh);
166         out_be32(&clock_regs->sccr, saved_regs.sccr);
167 }
168 
169 static void mpc83xx_suspend_save_regs(void)
170 {
171         saved_regs.sicrl = in_be32(&syscr_regs->sicrl);
172         saved_regs.sicrh = in_be32(&syscr_regs->sicrh);
173         saved_regs.sccr = in_be32(&clock_regs->sccr);
174 }
175 
176 static int mpc83xx_suspend_enter(suspend_state_t state)
177 {
178         int ret = -EAGAIN;
179 
180         /* Don't go to sleep if there's a race where pci_pm_state changes
181          * between the agent thread checking it and the PM code disabling
182          * interrupts.
183          */
184         if (wake_from_pci) {
185                 if (pci_pm_state != (deep_sleeping ? 3 : 2))
186                         goto out;
187 
188                 out_be32(&pmc_regs->config1,
189                          in_be32(&pmc_regs->config1) | PMCCR1_PME_EN);
190         }
191 
192         /* Put the system into low-power mode and the RAM
193          * into self-refresh mode once the core goes to
194          * sleep.
195          */
196 
197         out_be32(&pmc_regs->config, PMCCR_SLPEN | PMCCR_DLPEN);
198 
199         /* If it has deep sleep (i.e. it's an 831x or compatible),
200          * disable power to the core upon entering sleep mode.  This will
201          * require going through the boot firmware upon a wakeup event.
202          */
203 
204         if (deep_sleeping) {
205                 mpc83xx_suspend_save_regs();
206 
207                 out_be32(&pmc_regs->mask, PMCER_ALL);
208 
209                 out_be32(&pmc_regs->config1,
210                          in_be32(&pmc_regs->config1) | PMCCR1_POWER_OFF);
211 
212                 enable_kernel_fp();
213 
214                 mpc83xx_enter_deep_sleep(immrbase);
215 
216                 out_be32(&pmc_regs->config1,
217                          in_be32(&pmc_regs->config1) & ~PMCCR1_POWER_OFF);
218 
219                 out_be32(&pmc_regs->mask, PMCER_PMCI);
220 
221                 mpc83xx_suspend_restore_regs();
222         } else {
223                 out_be32(&pmc_regs->mask, PMCER_PMCI);
224 
225                 mpc6xx_enter_standby();
226         }
227 
228         ret = 0;
229 
230 out:
231         out_be32(&pmc_regs->config1,
232                  in_be32(&pmc_regs->config1) & ~PMCCR1_PME_EN);
233 
234         return ret;
235 }
236 
237 static void mpc83xx_suspend_end(void)
238 {
239         deep_sleeping = 0;
240 }
241 
242 static int mpc83xx_suspend_valid(suspend_state_t state)
243 {
244         return state == PM_SUSPEND_STANDBY || state == PM_SUSPEND_MEM;
245 }
246 
247 static int mpc83xx_suspend_begin(suspend_state_t state)
248 {
249         switch (state) {
250                 case PM_SUSPEND_STANDBY:
251                         deep_sleeping = 0;
252                         return 0;
253 
254                 case PM_SUSPEND_MEM:
255                         if (has_deep_sleep)
256                                 deep_sleeping = 1;
257 
258                         return 0;
259 
260                 default:
261                         return -EINVAL;
262         }
263 }
264 
265 static int agent_thread_fn(void *data)
266 {
267         while (1) {
268                 wait_event_interruptible(agent_wq, pci_pm_state >= 2);
269                 try_to_freeze();
270 
271                 if (signal_pending(current) || pci_pm_state < 2)
272                         continue;
273 
274                 /* With a preemptible kernel (or SMP), this could race with
275                  * a userspace-driven suspend request.  It's probably best
276                  * to avoid mixing the two with such a configuration (or
277                  * else fix it by adding a mutex to state_store that we can
278                  * synchronize with).
279                  */
280 
281                 wake_from_pci = 1;
282 
283                 pm_suspend(pci_pm_state == 3 ? PM_SUSPEND_MEM :
284                                                PM_SUSPEND_STANDBY);
285 
286                 wake_from_pci = 0;
287         }
288 
289         return 0;
290 }
291 
292 static void mpc83xx_set_agent(void)
293 {
294         out_be32(&pmc_regs->config1, PMCCR1_USE_STATE);
295         out_be32(&pmc_regs->mask, PMCER_PMCI);
296 
297         kthread_run(agent_thread_fn, NULL, "PCI power mgt");
298 }
299 
300 static int mpc83xx_is_pci_agent(void)
301 {
302         struct mpc83xx_rcw __iomem *rcw_regs;
303         int ret;
304 
305         rcw_regs = ioremap(get_immrbase() + IMMR_RCW_OFFSET,
306                            sizeof(struct mpc83xx_rcw));
307 
308         if (!rcw_regs)
309                 return -ENOMEM;
310 
311         ret = !(in_be32(&rcw_regs->rcwhr) & RCW_PCI_HOST);
312 
313         iounmap(rcw_regs);
314         return ret;
315 }
316 
317 static const struct platform_suspend_ops mpc83xx_suspend_ops = {
318         .valid = mpc83xx_suspend_valid,
319         .begin = mpc83xx_suspend_begin,
320         .enter = mpc83xx_suspend_enter,
321         .end = mpc83xx_suspend_end,
322 };
323 
324 static struct of_device_id pmc_match[];
325 static int pmc_probe(struct platform_device *ofdev)
326 {
327         const struct of_device_id *match;
328         struct device_node *np = ofdev->dev.of_node;
329         struct resource res;
330         const struct pmc_type *type;
331         int ret = 0;
332 
333         match = of_match_device(pmc_match, &ofdev->dev);
334         if (!match)
335                 return -EINVAL;
336 
337         type = match->data;
338 
339         if (!of_device_is_available(np))
340                 return -ENODEV;
341 
342         has_deep_sleep = type->has_deep_sleep;
343         immrbase = get_immrbase();
344         pmc_dev = ofdev;
345 
346         is_pci_agent = mpc83xx_is_pci_agent();
347         if (is_pci_agent < 0)
348                 return is_pci_agent;
349 
350         ret = of_address_to_resource(np, 0, &res);
351         if (ret)
352                 return -ENODEV;
353 
354         pmc_irq = irq_of_parse_and_map(np, 0);
355         if (pmc_irq != NO_IRQ) {
356                 ret = request_irq(pmc_irq, pmc_irq_handler, IRQF_SHARED,
357                                   "pmc", ofdev);
358 
359                 if (ret)
360                         return -EBUSY;
361         }
362 
363         pmc_regs = ioremap(res.start, sizeof(struct mpc83xx_pmc));
364 
365         if (!pmc_regs) {
366                 ret = -ENOMEM;
367                 goto out;
368         }
369 
370         ret = of_address_to_resource(np, 1, &res);
371         if (ret) {
372                 ret = -ENODEV;
373                 goto out_pmc;
374         }
375 
376         clock_regs = ioremap(res.start, sizeof(struct mpc83xx_pmc));
377 
378         if (!clock_regs) {
379                 ret = -ENOMEM;
380                 goto out_pmc;
381         }
382 
383         if (has_deep_sleep) {
384                 syscr_regs = ioremap(immrbase + IMMR_SYSCR_OFFSET,
385                                      sizeof(*syscr_regs));
386                 if (!syscr_regs) {
387                         ret = -ENOMEM;
388                         goto out_syscr;
389                 }
390         }
391 
392         if (is_pci_agent)
393                 mpc83xx_set_agent();
394 
395         suspend_set_ops(&mpc83xx_suspend_ops);
396         return 0;
397 
398 out_syscr:
399         iounmap(clock_regs);
400 out_pmc:
401         iounmap(pmc_regs);
402 out:
403         if (pmc_irq != NO_IRQ)
404                 free_irq(pmc_irq, ofdev);
405 
406         return ret;
407 }
408 
409 static int pmc_remove(struct platform_device *ofdev)
410 {
411         return -EPERM;
412 };
413 
414 static struct pmc_type pmc_types[] = {
415         {
416                 .has_deep_sleep = 1,
417         },
418         {
419                 .has_deep_sleep = 0,
420         }
421 };
422 
423 static struct of_device_id pmc_match[] = {
424         {
425                 .compatible = "fsl,mpc8313-pmc",
426                 .data = &pmc_types[0],
427         },
428         {
429                 .compatible = "fsl,mpc8349-pmc",
430                 .data = &pmc_types[1],
431         },
432         {}
433 };
434 
435 static struct platform_driver pmc_driver = {
436         .driver = {
437                 .name = "mpc83xx-pmc",
438                 .owner = THIS_MODULE,
439                 .of_match_table = pmc_match,
440         },
441         .probe = pmc_probe,
442         .remove = pmc_remove
443 };
444 
445 static int pmc_init(void)
446 {
447         return platform_driver_register(&pmc_driver);
448 }
449 
450 module_init(pmc_init);
451 

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