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.
13 #include <linux/init.h>
15 #include <linux/types.h>
16 #include <linux/ioport.h>
17 #include <linux/interrupt.h>
18 #include <linux/wait.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_platform.h>
28 #include <asm/mpc6xx.h>
30 #include <sysdev/fsl_soc.h>
32 #define PMCCR1_NEXT_STATE 0x0C /* Next state for power management */
33 #define PMCCR1_NEXT_STATE_SHIFT 2
34 #define PMCCR1_CURR_STATE 0x03 /* Current state for power management*/
35 #define IMMR_RCW_OFFSET 0x900
36 #define RCW_PCI_HOST 0x80000000
38 void mpc83xx_enter_deep_sleep(phys_addr_t immrbase);
42 #define PMCCR_DLPEN 2 /* DDR SDRAM low power enable */
43 #define PMCCR_SLPEN 1 /* System low power enable */
47 /* All but PMCI are deep-sleep only */
48 #define PMCER_GPIO 0x100
49 #define PMCER_PCI 0x080
50 #define PMCER_USB 0x040
51 #define PMCER_ETSEC1 0x020
52 #define PMCER_ETSEC2 0x010
53 #define PMCER_TIMER 0x008
54 #define PMCER_INT1 0x004
55 #define PMCER_INT2 0x002
56 #define PMCER_PMCI 0x001
57 #define PMCER_ALL 0x1FF
61 #define PMCCR1_USE_STATE 0x80000000
62 #define PMCCR1_PME_EN 0x00000080
63 #define PMCCR1_ASSERT_PME 0x00000040
64 #define PMCCR1_POWER_OFF 0x00000020
75 struct mpc83xx_clock {
85 static struct of_device *pmc_dev;
86 static int has_deep_sleep, deep_sleeping;
88 static struct mpc83xx_pmc __iomem *pmc_regs;
89 static struct mpc83xx_clock __iomem *clock_regs;
90 static int is_pci_agent, wake_from_pci;
91 static phys_addr_t immrbase;
92 static int pci_pm_state;
93 static DECLARE_WAIT_QUEUE_HEAD(agent_wq);
95 int fsl_deep_sleep(void)
99 EXPORT_SYMBOL(fsl_deep_sleep);
101 static int mpc83xx_change_state(void)
104 u32 reg_cfg1 = in_be32(&pmc_regs->config1);
107 pci_pm_state = (reg_cfg1 & PMCCR1_NEXT_STATE) >>
108 PMCCR1_NEXT_STATE_SHIFT;
109 curr_state = reg_cfg1 & PMCCR1_CURR_STATE;
111 if (curr_state != pci_pm_state) {
112 reg_cfg1 &= ~PMCCR1_CURR_STATE;
113 reg_cfg1 |= pci_pm_state;
114 out_be32(&pmc_regs->config1, reg_cfg1);
124 static irqreturn_t pmc_irq_handler(int irq, void *dev_id)
126 u32 event = in_be32(&pmc_regs->event);
129 if (mpc83xx_change_state())
133 out_be32(&pmc_regs->event, event);
140 static int mpc83xx_suspend_enter(suspend_state_t state)
144 /* Don't go to sleep if there's a race where pci_pm_state changes
145 * between the agent thread checking it and the PM code disabling
149 if (pci_pm_state != (deep_sleeping ? 3 : 2))
152 out_be32(&pmc_regs->config1,
153 in_be32(&pmc_regs->config1) | PMCCR1_PME_EN);
156 /* Put the system into low-power mode and the RAM
157 * into self-refresh mode once the core goes to
161 out_be32(&pmc_regs->config, PMCCR_SLPEN | PMCCR_DLPEN);
163 /* If it has deep sleep (i.e. it's an 831x or compatible),
164 * disable power to the core upon entering sleep mode. This will
165 * require going through the boot firmware upon a wakeup event.
169 out_be32(&pmc_regs->mask, PMCER_ALL);
171 out_be32(&pmc_regs->config1,
172 in_be32(&pmc_regs->config1) | PMCCR1_POWER_OFF);
176 mpc83xx_enter_deep_sleep(immrbase);
178 out_be32(&pmc_regs->config1,
179 in_be32(&pmc_regs->config1) & ~PMCCR1_POWER_OFF);
181 out_be32(&pmc_regs->mask, PMCER_PMCI);
183 out_be32(&pmc_regs->mask, PMCER_PMCI);
185 mpc6xx_enter_standby();
191 out_be32(&pmc_regs->config1,
192 in_be32(&pmc_regs->config1) & ~PMCCR1_PME_EN);
197 static void mpc83xx_suspend_finish(void)
202 static int mpc83xx_suspend_valid(suspend_state_t state)
204 return state == PM_SUSPEND_STANDBY || state == PM_SUSPEND_MEM;
207 static int mpc83xx_suspend_begin(suspend_state_t state)
210 case PM_SUSPEND_STANDBY:
225 static int agent_thread_fn(void *data)
228 wait_event_interruptible(agent_wq, pci_pm_state >= 2);
231 if (signal_pending(current) || pci_pm_state < 2)
234 /* With a preemptible kernel (or SMP), this could race with
235 * a userspace-driven suspend request. It's probably best
236 * to avoid mixing the two with such a configuration (or
237 * else fix it by adding a mutex to state_store that we can
243 pm_suspend(pci_pm_state == 3 ? PM_SUSPEND_MEM :
252 static void mpc83xx_set_agent(void)
254 out_be32(&pmc_regs->config1, PMCCR1_USE_STATE);
255 out_be32(&pmc_regs->mask, PMCER_PMCI);
257 kthread_run(agent_thread_fn, NULL, "PCI power mgt");
260 static int mpc83xx_is_pci_agent(void)
262 struct mpc83xx_rcw __iomem *rcw_regs;
265 rcw_regs = ioremap(get_immrbase() + IMMR_RCW_OFFSET,
266 sizeof(struct mpc83xx_rcw));
271 ret = !(in_be32(&rcw_regs->rcwhr) & RCW_PCI_HOST);
277 static struct platform_suspend_ops mpc83xx_suspend_ops = {
278 .valid = mpc83xx_suspend_valid,
279 .begin = mpc83xx_suspend_begin,
280 .enter = mpc83xx_suspend_enter,
281 .finish = mpc83xx_suspend_finish,
284 static int pmc_probe(struct of_device *ofdev,
285 const struct of_device_id *match)
287 struct device_node *np = ofdev->node;
289 struct pmc_type *type = match->data;
292 if (!of_device_is_available(np))
295 has_deep_sleep = type->has_deep_sleep;
296 immrbase = get_immrbase();
299 is_pci_agent = mpc83xx_is_pci_agent();
300 if (is_pci_agent < 0)
303 ret = of_address_to_resource(np, 0, &res);
307 pmc_irq = irq_of_parse_and_map(np, 0);
308 if (pmc_irq != NO_IRQ) {
309 ret = request_irq(pmc_irq, pmc_irq_handler, IRQF_SHARED,
316 pmc_regs = ioremap(res.start, sizeof(struct mpc83xx_pmc));
323 ret = of_address_to_resource(np, 1, &res);
329 clock_regs = ioremap(res.start, sizeof(struct mpc83xx_pmc));
339 suspend_set_ops(&mpc83xx_suspend_ops);
345 if (pmc_irq != NO_IRQ)
346 free_irq(pmc_irq, ofdev);
351 static int pmc_remove(struct of_device *ofdev)
356 static struct pmc_type pmc_types[] = {
365 static struct of_device_id pmc_match[] = {
367 .compatible = "fsl,mpc8313-pmc",
368 .data = &pmc_types[0],
371 .compatible = "fsl,mpc8349-pmc",
372 .data = &pmc_types[1],
377 static struct of_platform_driver pmc_driver = {
378 .name = "mpc83xx-pmc",
379 .match_table = pmc_match,
384 static int pmc_init(void)
386 return of_register_platform_driver(&pmc_driver);
389 module_init(pmc_init);