2 * MPC83xx suspend support
4 * Author: Scott Wood <scottwood@freescale.com>
6 * Copyright (c) 2006-2007 Freescale Semiconductor, Inc.
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.
14 #include <linux/types.h>
15 #include <linux/ioport.h>
16 #include <linux/interrupt.h>
17 #include <linux/wait.h>
18 #include <linux/sched/signal.h>
19 #include <linux/kthread.h>
20 #include <linux/freezer.h>
21 #include <linux/suspend.h>
22 #include <linux/fsl_devices.h>
23 #include <linux/of_address.h>
24 #include <linux/of_irq.h>
25 #include <linux/of_platform.h>
26 #include <linux/export.h>
31 #include <asm/mpc6xx.h>
32 #include <asm/switch_to.h>
34 #include <sysdev/fsl_soc.h>
36 #define PMCCR1_NEXT_STATE 0x0C /* Next state for power management */
37 #define PMCCR1_NEXT_STATE_SHIFT 2
38 #define PMCCR1_CURR_STATE 0x03 /* Current state for power management*/
39 #define IMMR_SYSCR_OFFSET 0x100
40 #define IMMR_RCW_OFFSET 0x900
41 #define RCW_PCI_HOST 0x80000000
43 void mpc83xx_enter_deep_sleep(phys_addr_t immrbase);
47 #define PMCCR_DLPEN 2 /* DDR SDRAM low power enable */
48 #define PMCCR_SLPEN 1 /* System low power enable */
52 /* All but PMCI are deep-sleep only */
53 #define PMCER_GPIO 0x100
54 #define PMCER_PCI 0x080
55 #define PMCER_USB 0x040
56 #define PMCER_ETSEC1 0x020
57 #define PMCER_ETSEC2 0x010
58 #define PMCER_TIMER 0x008
59 #define PMCER_INT1 0x004
60 #define PMCER_INT2 0x002
61 #define PMCER_PMCI 0x001
62 #define PMCER_ALL 0x1FF
66 #define PMCCR1_USE_STATE 0x80000000
67 #define PMCCR1_PME_EN 0x00000080
68 #define PMCCR1_ASSERT_PME 0x00000040
69 #define PMCCR1_POWER_OFF 0x00000020
80 struct mpc83xx_clock {
86 struct mpc83xx_syscr {
96 struct mpc83xx_saved {
106 static struct platform_device *pmc_dev;
107 static int has_deep_sleep, deep_sleeping;
109 static struct mpc83xx_pmc __iomem *pmc_regs;
110 static struct mpc83xx_clock __iomem *clock_regs;
111 static struct mpc83xx_syscr __iomem *syscr_regs;
112 static struct mpc83xx_saved saved_regs;
113 static int is_pci_agent, wake_from_pci;
114 static phys_addr_t immrbase;
115 static int pci_pm_state;
116 static DECLARE_WAIT_QUEUE_HEAD(agent_wq);
118 int fsl_deep_sleep(void)
120 return deep_sleeping;
122 EXPORT_SYMBOL(fsl_deep_sleep);
124 static int mpc83xx_change_state(void)
127 u32 reg_cfg1 = in_be32(&pmc_regs->config1);
130 pci_pm_state = (reg_cfg1 & PMCCR1_NEXT_STATE) >>
131 PMCCR1_NEXT_STATE_SHIFT;
132 curr_state = reg_cfg1 & PMCCR1_CURR_STATE;
134 if (curr_state != pci_pm_state) {
135 reg_cfg1 &= ~PMCCR1_CURR_STATE;
136 reg_cfg1 |= pci_pm_state;
137 out_be32(&pmc_regs->config1, reg_cfg1);
147 static irqreturn_t pmc_irq_handler(int irq, void *dev_id)
149 u32 event = in_be32(&pmc_regs->event);
152 if (mpc83xx_change_state())
156 out_be32(&pmc_regs->event, event);
163 static void mpc83xx_suspend_restore_regs(void)
165 out_be32(&syscr_regs->sicrl, saved_regs.sicrl);
166 out_be32(&syscr_regs->sicrh, saved_regs.sicrh);
167 out_be32(&clock_regs->sccr, saved_regs.sccr);
170 static void mpc83xx_suspend_save_regs(void)
172 saved_regs.sicrl = in_be32(&syscr_regs->sicrl);
173 saved_regs.sicrh = in_be32(&syscr_regs->sicrh);
174 saved_regs.sccr = in_be32(&clock_regs->sccr);
177 static int mpc83xx_suspend_enter(suspend_state_t state)
181 /* Don't go to sleep if there's a race where pci_pm_state changes
182 * between the agent thread checking it and the PM code disabling
186 if (pci_pm_state != (deep_sleeping ? 3 : 2))
189 out_be32(&pmc_regs->config1,
190 in_be32(&pmc_regs->config1) | PMCCR1_PME_EN);
193 /* Put the system into low-power mode and the RAM
194 * into self-refresh mode once the core goes to
198 out_be32(&pmc_regs->config, PMCCR_SLPEN | PMCCR_DLPEN);
200 /* If it has deep sleep (i.e. it's an 831x or compatible),
201 * disable power to the core upon entering sleep mode. This will
202 * require going through the boot firmware upon a wakeup event.
206 mpc83xx_suspend_save_regs();
208 out_be32(&pmc_regs->mask, PMCER_ALL);
210 out_be32(&pmc_regs->config1,
211 in_be32(&pmc_regs->config1) | PMCCR1_POWER_OFF);
215 mpc83xx_enter_deep_sleep(immrbase);
217 out_be32(&pmc_regs->config1,
218 in_be32(&pmc_regs->config1) & ~PMCCR1_POWER_OFF);
220 out_be32(&pmc_regs->mask, PMCER_PMCI);
222 mpc83xx_suspend_restore_regs();
224 out_be32(&pmc_regs->mask, PMCER_PMCI);
226 mpc6xx_enter_standby();
232 out_be32(&pmc_regs->config1,
233 in_be32(&pmc_regs->config1) & ~PMCCR1_PME_EN);
238 static void mpc83xx_suspend_end(void)
243 static int mpc83xx_suspend_valid(suspend_state_t state)
245 return state == PM_SUSPEND_STANDBY || state == PM_SUSPEND_MEM;
248 static int mpc83xx_suspend_begin(suspend_state_t state)
251 case PM_SUSPEND_STANDBY:
266 static int agent_thread_fn(void *data)
269 wait_event_interruptible(agent_wq, pci_pm_state >= 2);
272 if (signal_pending(current) || pci_pm_state < 2)
275 /* With a preemptible kernel (or SMP), this could race with
276 * a userspace-driven suspend request. It's probably best
277 * to avoid mixing the two with such a configuration (or
278 * else fix it by adding a mutex to state_store that we can
284 pm_suspend(pci_pm_state == 3 ? PM_SUSPEND_MEM :
293 static void mpc83xx_set_agent(void)
295 out_be32(&pmc_regs->config1, PMCCR1_USE_STATE);
296 out_be32(&pmc_regs->mask, PMCER_PMCI);
298 kthread_run(agent_thread_fn, NULL, "PCI power mgt");
301 static int mpc83xx_is_pci_agent(void)
303 struct mpc83xx_rcw __iomem *rcw_regs;
306 rcw_regs = ioremap(get_immrbase() + IMMR_RCW_OFFSET,
307 sizeof(struct mpc83xx_rcw));
312 ret = !(in_be32(&rcw_regs->rcwhr) & RCW_PCI_HOST);
318 static const struct platform_suspend_ops mpc83xx_suspend_ops = {
319 .valid = mpc83xx_suspend_valid,
320 .begin = mpc83xx_suspend_begin,
321 .enter = mpc83xx_suspend_enter,
322 .end = mpc83xx_suspend_end,
325 static const struct of_device_id pmc_match[];
326 static int pmc_probe(struct platform_device *ofdev)
328 const struct of_device_id *match;
329 struct device_node *np = ofdev->dev.of_node;
331 const struct pmc_type *type;
334 match = of_match_device(pmc_match, &ofdev->dev);
340 if (!of_device_is_available(np))
343 has_deep_sleep = type->has_deep_sleep;
344 immrbase = get_immrbase();
347 is_pci_agent = mpc83xx_is_pci_agent();
348 if (is_pci_agent < 0)
351 ret = of_address_to_resource(np, 0, &res);
355 pmc_irq = irq_of_parse_and_map(np, 0);
357 ret = request_irq(pmc_irq, pmc_irq_handler, IRQF_SHARED,
364 pmc_regs = ioremap(res.start, sizeof(*pmc_regs));
371 ret = of_address_to_resource(np, 1, &res);
377 clock_regs = ioremap(res.start, sizeof(*clock_regs));
384 if (has_deep_sleep) {
385 syscr_regs = ioremap(immrbase + IMMR_SYSCR_OFFSET,
386 sizeof(*syscr_regs));
396 suspend_set_ops(&mpc83xx_suspend_ops);
405 free_irq(pmc_irq, ofdev);
410 static int pmc_remove(struct platform_device *ofdev)
415 static struct pmc_type pmc_types[] = {
424 static const struct of_device_id pmc_match[] = {
426 .compatible = "fsl,mpc8313-pmc",
427 .data = &pmc_types[0],
430 .compatible = "fsl,mpc8349-pmc",
431 .data = &pmc_types[1],
436 static struct platform_driver pmc_driver = {
438 .name = "mpc83xx-pmc",
439 .of_match_table = pmc_match,
445 builtin_platform_driver(pmc_driver);