2 * Power Management Service Unit(PMSU) support for Armada 370/XP platforms.
4 * Copyright (C) 2012 Marvell
6 * Yehuda Yitschak <yehuday@marvell.com>
7 * Gregory Clement <gregory.clement@free-electrons.com>
8 * Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
10 * This file is licensed under the terms of the GNU General Public
11 * License version 2. This program is licensed "as is" without any
12 * warranty of any kind, whether express or implied.
14 * The Armada 370 and Armada XP SOCs have a power management service
15 * unit which is responsible for powering down and waking up CPUs and
19 #define pr_fmt(fmt) "mvebu-pmsu: " fmt
21 #include <linux/cpu_pm.h>
22 #include <linux/kernel.h>
23 #include <linux/init.h>
24 #include <linux/of_address.h>
26 #include <linux/platform_device.h>
27 #include <linux/smp.h>
28 #include <linux/resource.h>
29 #include <asm/cacheflush.h>
31 #include <asm/smp_plat.h>
32 #include <asm/suspend.h>
33 #include <asm/tlbflush.h>
36 static void __iomem *pmsu_mp_base;
38 #define PMSU_BASE_OFFSET 0x100
39 #define PMSU_REG_SIZE 0x1000
41 /* PMSU MP registers */
42 #define PMSU_CONTROL_AND_CONFIG(cpu) ((cpu * 0x100) + 0x104)
43 #define PMSU_CONTROL_AND_CONFIG_DFS_REQ BIT(18)
44 #define PMSU_CONTROL_AND_CONFIG_PWDDN_REQ BIT(16)
45 #define PMSU_CONTROL_AND_CONFIG_L2_PWDDN BIT(20)
47 #define PMSU_CPU_POWER_DOWN_CONTROL(cpu) ((cpu * 0x100) + 0x108)
49 #define PMSU_CPU_POWER_DOWN_DIS_SNP_Q_SKIP BIT(0)
51 #define PMSU_STATUS_AND_MASK(cpu) ((cpu * 0x100) + 0x10c)
52 #define PMSU_STATUS_AND_MASK_CPU_IDLE_WAIT BIT(16)
53 #define PMSU_STATUS_AND_MASK_SNP_Q_EMPTY_WAIT BIT(17)
54 #define PMSU_STATUS_AND_MASK_IRQ_WAKEUP BIT(20)
55 #define PMSU_STATUS_AND_MASK_FIQ_WAKEUP BIT(21)
56 #define PMSU_STATUS_AND_MASK_DBG_WAKEUP BIT(22)
57 #define PMSU_STATUS_AND_MASK_IRQ_MASK BIT(24)
58 #define PMSU_STATUS_AND_MASK_FIQ_MASK BIT(25)
60 #define PMSU_BOOT_ADDR_REDIRECT_OFFSET(cpu) ((cpu * 0x100) + 0x124)
62 /* PMSU fabric registers */
63 #define L2C_NFABRIC_PM_CTL 0x4
64 #define L2C_NFABRIC_PM_CTL_PWR_DOWN BIT(20)
66 extern void ll_disable_coherency(void);
67 extern void ll_enable_coherency(void);
69 static struct platform_device armada_xp_cpuidle_device = {
70 .name = "cpuidle-armada-370-xp",
73 static struct of_device_id of_pmsu_table[] = {
74 { .compatible = "marvell,armada-370-pmsu", },
75 { .compatible = "marvell,armada-370-xp-pmsu", },
76 { .compatible = "marvell,armada-380-pmsu", },
77 { /* end of list */ },
80 void mvebu_pmsu_set_cpu_boot_addr(int hw_cpu, void *boot_addr)
82 writel(virt_to_phys(boot_addr), pmsu_mp_base +
83 PMSU_BOOT_ADDR_REDIRECT_OFFSET(hw_cpu));
86 static int __init armada_370_xp_pmsu_init(void)
88 struct device_node *np;
92 np = of_find_matching_node(NULL, of_pmsu_table);
96 pr_info("Initializing Power Management Service Unit\n");
98 if (of_address_to_resource(np, 0, &res)) {
99 pr_err("unable to get resource\n");
104 if (of_device_is_compatible(np, "marvell,armada-370-xp-pmsu")) {
105 pr_warn(FW_WARN "deprecated pmsu binding\n");
106 res.start = res.start - PMSU_BASE_OFFSET;
107 res.end = res.start + PMSU_REG_SIZE - 1;
110 if (!request_mem_region(res.start, resource_size(&res),
112 pr_err("unable to request region\n");
117 pmsu_mp_base = ioremap(res.start, resource_size(&res));
119 pr_err("unable to map registers\n");
120 release_mem_region(res.start, resource_size(&res));
130 static void armada_370_xp_pmsu_enable_l2_powerdown_onidle(void)
134 if (pmsu_mp_base == NULL)
137 /* Enable L2 & Fabric powerdown in Deep-Idle mode - Fabric */
138 reg = readl(pmsu_mp_base + L2C_NFABRIC_PM_CTL);
139 reg |= L2C_NFABRIC_PM_CTL_PWR_DOWN;
140 writel(reg, pmsu_mp_base + L2C_NFABRIC_PM_CTL);
143 static void armada_370_xp_cpu_resume(void)
145 asm volatile("bl ll_add_cpu_to_smp_group\n\t"
146 "bl ll_enable_coherency\n\t"
150 /* No locking is needed because we only access per-CPU registers */
151 void armada_370_xp_pmsu_idle_prepare(bool deepidle)
153 unsigned int hw_cpu = cpu_logical_map(smp_processor_id());
156 if (pmsu_mp_base == NULL)
160 * Adjust the PMSU configuration to wait for WFI signal, enable
161 * IRQ and FIQ as wakeup events, set wait for snoop queue empty
162 * indication and mask IRQ and FIQ from CPU
164 reg = readl(pmsu_mp_base + PMSU_STATUS_AND_MASK(hw_cpu));
165 reg |= PMSU_STATUS_AND_MASK_CPU_IDLE_WAIT |
166 PMSU_STATUS_AND_MASK_IRQ_WAKEUP |
167 PMSU_STATUS_AND_MASK_FIQ_WAKEUP |
168 PMSU_STATUS_AND_MASK_SNP_Q_EMPTY_WAIT |
169 PMSU_STATUS_AND_MASK_IRQ_MASK |
170 PMSU_STATUS_AND_MASK_FIQ_MASK;
171 writel(reg, pmsu_mp_base + PMSU_STATUS_AND_MASK(hw_cpu));
173 reg = readl(pmsu_mp_base + PMSU_CONTROL_AND_CONFIG(hw_cpu));
174 /* ask HW to power down the L2 Cache if needed */
176 reg |= PMSU_CONTROL_AND_CONFIG_L2_PWDDN;
178 /* request power down */
179 reg |= PMSU_CONTROL_AND_CONFIG_PWDDN_REQ;
180 writel(reg, pmsu_mp_base + PMSU_CONTROL_AND_CONFIG(hw_cpu));
182 /* Disable snoop disable by HW - SW is taking care of it */
183 reg = readl(pmsu_mp_base + PMSU_CPU_POWER_DOWN_CONTROL(hw_cpu));
184 reg |= PMSU_CPU_POWER_DOWN_DIS_SNP_Q_SKIP;
185 writel(reg, pmsu_mp_base + PMSU_CPU_POWER_DOWN_CONTROL(hw_cpu));
188 static noinline int do_armada_370_xp_cpu_suspend(unsigned long deepidle)
190 armada_370_xp_pmsu_idle_prepare(deepidle);
192 v7_exit_coherency_flush(all);
194 ll_disable_coherency();
200 /* If we are here, wfi failed. As processors run out of
201 * coherency for some time, tlbs might be stale, so flush them
203 local_flush_tlb_all();
205 ll_enable_coherency();
207 /* Test the CR_C bit and set it if it was cleared */
209 "mrc p15, 0, %0, c1, c0, 0 \n\t"
210 "tst %0, #(1 << 2) \n\t"
211 "orreq %0, %0, #(1 << 2) \n\t"
212 "mcreq p15, 0, %0, c1, c0, 0 \n\t"
216 pr_warn("Failed to suspend the system\n");
221 static int armada_370_xp_cpu_suspend(unsigned long deepidle)
223 return cpu_suspend(deepidle, do_armada_370_xp_cpu_suspend);
226 /* No locking is needed because we only access per-CPU registers */
227 static noinline void armada_370_xp_pmsu_idle_restore(void)
229 unsigned int hw_cpu = cpu_logical_map(smp_processor_id());
232 if (pmsu_mp_base == NULL)
235 /* cancel ask HW to power down the L2 Cache if possible */
236 reg = readl(pmsu_mp_base + PMSU_CONTROL_AND_CONFIG(hw_cpu));
237 reg &= ~PMSU_CONTROL_AND_CONFIG_L2_PWDDN;
238 writel(reg, pmsu_mp_base + PMSU_CONTROL_AND_CONFIG(hw_cpu));
240 /* cancel Enable wakeup events and mask interrupts */
241 reg = readl(pmsu_mp_base + PMSU_STATUS_AND_MASK(hw_cpu));
242 reg &= ~(PMSU_STATUS_AND_MASK_IRQ_WAKEUP | PMSU_STATUS_AND_MASK_FIQ_WAKEUP);
243 reg &= ~PMSU_STATUS_AND_MASK_CPU_IDLE_WAIT;
244 reg &= ~PMSU_STATUS_AND_MASK_SNP_Q_EMPTY_WAIT;
245 reg &= ~(PMSU_STATUS_AND_MASK_IRQ_MASK | PMSU_STATUS_AND_MASK_FIQ_MASK);
246 writel(reg, pmsu_mp_base + PMSU_STATUS_AND_MASK(hw_cpu));
249 static int armada_370_xp_cpu_pm_notify(struct notifier_block *self,
250 unsigned long action, void *hcpu)
252 if (action == CPU_PM_ENTER) {
253 unsigned int hw_cpu = cpu_logical_map(smp_processor_id());
254 mvebu_pmsu_set_cpu_boot_addr(hw_cpu, armada_370_xp_cpu_resume);
255 } else if (action == CPU_PM_EXIT) {
256 armada_370_xp_pmsu_idle_restore();
262 static struct notifier_block armada_370_xp_cpu_pm_notifier = {
263 .notifier_call = armada_370_xp_cpu_pm_notify,
266 int __init armada_370_xp_cpu_pm_init(void)
268 struct device_node *np;
271 * Check that all the requirements are available to enable
272 * cpuidle. So far, it is only supported on Armada XP, cpuidle
273 * needs the coherency fabric and the PMSU enabled
276 if (!of_machine_is_compatible("marvell,armadaxp"))
279 np = of_find_compatible_node(NULL, NULL, "marvell,coherency-fabric");
284 np = of_find_matching_node(NULL, of_pmsu_table);
289 armada_370_xp_pmsu_enable_l2_powerdown_onidle();
290 armada_xp_cpuidle_device.dev.platform_data = armada_370_xp_cpu_suspend;
291 platform_device_register(&armada_xp_cpuidle_device);
292 cpu_pm_register_notifier(&armada_370_xp_cpu_pm_notifier);
297 arch_initcall(armada_370_xp_cpu_pm_init);
298 early_initcall(armada_370_xp_pmsu_init);