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authorLinus Torvalds <torvalds@linux-foundation.org>2018-08-23 13:44:43 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2018-08-23 13:44:43 -0700
commit9e259f9352d52053058a234f7c062c4e4f56dc85 (patch)
treebfb1c442e27f95ddb9a04bae2a44ca9e3dd69a85 /arch/arm/mach-at91
parent5563ae9b39c5ba492be1b18f2d72fd43ba549915 (diff)
parentf0fc40aff6fee100ffbed8328a0df88f8aa75fce (diff)
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Merge tag 'armsoc-soc' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
Pull ARM 32-bit SoC platform updates from Olof Johansson: "Most of the SoC updates in this cycle are cleanups and moves to more modern infrastructure: - Davinci was moved to common clock framework - OMAP1-based Amstrad E3 "Superphone" saw a bunch of cleanups to the keyboard interface (bitbanged AT keyboard via GPIO). - Removal of some stale code for Renesas platforms - Power management improvements for i.MX6LL" * tag 'armsoc-soc' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: (112 commits) ARM: uniphier: select RESET_CONTROLLER arm64: uniphier: select RESET_CONTROLLER ARM: uniphier: remove empty Makefile ARM: exynos: Clear global variable on init error path ARM: exynos: Remove outdated maintainer information ARM: shmobile: Always enable ARCH_TIMER on SoCs with A7 and/or A15 ARM: shmobile: r8a7779: hide unused r8a7779_platform_cpu_kill soc: r9a06g032: don't build SMP files for non-SMP config ARM: shmobile: Add the R9A06G032 SMP enabler driver ARM: at91: pm: configure wakeup sources for ULP1 mode ARM: at91: pm: add PMC fast startup registers defines ARM: at91: pm: Add ULP1 mode support ARM: at91: pm: Use ULP0 naming instead of slow clock ARM: hisi: handle of_iomap and fix missing of_node_put ARM: hisi: check of_iomap and fix missing of_node_put ARM: hisi: fix error handling and missing of_node_put ARM: mx5: Set the DBGEN bit in ARM_GPC register ARM: imx51: Configure M4IF to avoid visual artifacts ARM: imx: call imx6sx_cpuidle_init() conditionally for 6sll ARM: imx: fix i.MX6SLL build ...
Diffstat (limited to 'arch/arm/mach-at91')
-rw-r--r--arch/arm/mach-at91/pm.c187
-rw-r--r--arch/arm/mach-at91/pm.h6
-rw-r--r--arch/arm/mach-at91/pm_suspend.S142
3 files changed, 282 insertions, 53 deletions
diff --git a/arch/arm/mach-at91/pm.c b/arch/arm/mach-at91/pm.c
index 849014c01cf4..e8f3d0f97e61 100644
--- a/arch/arm/mach-at91/pm.c
+++ b/arch/arm/mach-at91/pm.c
@@ -40,15 +40,16 @@ extern void at91_pinctrl_gpio_resume(void);
#endif
static const match_table_t pm_modes __initconst = {
- { 0, "standby" },
- { AT91_PM_SLOW_CLOCK, "ulp0" },
+ { AT91_PM_STANDBY, "standby" },
+ { AT91_PM_ULP0, "ulp0" },
+ { AT91_PM_ULP1, "ulp1" },
{ AT91_PM_BACKUP, "backup" },
{ -1, NULL },
};
static struct at91_pm_data pm_data = {
- .standby_mode = 0,
- .suspend_mode = AT91_PM_SLOW_CLOCK,
+ .standby_mode = AT91_PM_STANDBY,
+ .suspend_mode = AT91_PM_ULP0,
};
#define at91_ramc_read(id, field) \
@@ -79,6 +80,90 @@ static struct at91_pm_bu {
phys_addr_t resume;
} *pm_bu;
+struct wakeup_source_info {
+ unsigned int pmc_fsmr_bit;
+ unsigned int shdwc_mr_bit;
+ bool set_polarity;
+};
+
+static const struct wakeup_source_info ws_info[] = {
+ { .pmc_fsmr_bit = AT91_PMC_FSTT(10), .set_polarity = true },
+ { .pmc_fsmr_bit = AT91_PMC_RTCAL, .shdwc_mr_bit = BIT(17) },
+ { .pmc_fsmr_bit = AT91_PMC_USBAL },
+ { .pmc_fsmr_bit = AT91_PMC_SDMMC_CD },
+};
+
+static const struct of_device_id sama5d2_ws_ids[] = {
+ { .compatible = "atmel,sama5d2-gem", .data = &ws_info[0] },
+ { .compatible = "atmel,at91rm9200-rtc", .data = &ws_info[1] },
+ { .compatible = "atmel,sama5d3-udc", .data = &ws_info[2] },
+ { .compatible = "atmel,at91rm9200-ohci", .data = &ws_info[2] },
+ { .compatible = "usb-ohci", .data = &ws_info[2] },
+ { .compatible = "atmel,at91sam9g45-ehci", .data = &ws_info[2] },
+ { .compatible = "usb-ehci", .data = &ws_info[2] },
+ { .compatible = "atmel,sama5d2-sdhci", .data = &ws_info[3] },
+ { /* sentinel */ }
+};
+
+static int at91_pm_config_ws(unsigned int pm_mode, bool set)
+{
+ const struct wakeup_source_info *wsi;
+ const struct of_device_id *match;
+ struct platform_device *pdev;
+ struct device_node *np;
+ unsigned int mode = 0, polarity = 0, val = 0;
+
+ if (pm_mode != AT91_PM_ULP1)
+ return 0;
+
+ if (!pm_data.pmc || !pm_data.shdwc)
+ return -EPERM;
+
+ if (!set) {
+ writel(mode, pm_data.pmc + AT91_PMC_FSMR);
+ return 0;
+ }
+
+ /* SHDWC.WUIR */
+ val = readl(pm_data.shdwc + 0x0c);
+ mode |= (val & 0x3ff);
+ polarity |= ((val >> 16) & 0x3ff);
+
+ /* SHDWC.MR */
+ val = readl(pm_data.shdwc + 0x04);
+
+ /* Loop through defined wakeup sources. */
+ for_each_matching_node_and_match(np, sama5d2_ws_ids, &match) {
+ pdev = of_find_device_by_node(np);
+ if (!pdev)
+ continue;
+
+ if (device_may_wakeup(&pdev->dev)) {
+ wsi = match->data;
+
+ /* Check if enabled on SHDWC. */
+ if (wsi->shdwc_mr_bit && !(val & wsi->shdwc_mr_bit))
+ goto put_node;
+
+ mode |= wsi->pmc_fsmr_bit;
+ if (wsi->set_polarity)
+ polarity |= wsi->pmc_fsmr_bit;
+ }
+
+put_node:
+ of_node_put(np);
+ }
+
+ if (mode) {
+ writel(mode, pm_data.pmc + AT91_PMC_FSMR);
+ writel(polarity, pm_data.pmc + AT91_PMC_FSPR);
+ } else {
+ pr_err("AT91: PM: no ULP1 wakeup sources found!");
+ }
+
+ return mode ? 0 : -EPERM;
+}
+
/*
* Called after processes are frozen, but before we shutdown devices.
*/
@@ -97,7 +182,7 @@ static int at91_pm_begin(suspend_state_t state)
pm_data.mode = -1;
}
- return 0;
+ return at91_pm_config_ws(pm_data.mode, true);
}
/*
@@ -145,7 +230,7 @@ static int at91_pm_verify_clocks(void)
*/
int at91_suspend_entering_slow_clock(void)
{
- return (pm_data.mode >= AT91_PM_SLOW_CLOCK);
+ return (pm_data.mode >= AT91_PM_ULP0);
}
EXPORT_SYMBOL(at91_suspend_entering_slow_clock);
@@ -186,7 +271,7 @@ static void at91_pm_suspend(suspend_state_t state)
* event sources; and reduces DRAM power. But otherwise it's identical to
* PM_SUSPEND_ON: cpu idle, and nothing fancy done with main or cpu clocks.
*
- * AT91_PM_SLOW_CLOCK is like STANDBY plus slow clock mode, so drivers must
+ * AT91_PM_ULP0 is like STANDBY plus slow clock mode, so drivers must
* suspend more deeply, the master clock switches to the clk32k and turns off
* the main oscillator
*
@@ -204,7 +289,7 @@ static int at91_pm_enter(suspend_state_t state)
/*
* Ensure that clocks are in a valid state.
*/
- if ((pm_data.mode >= AT91_PM_SLOW_CLOCK) &&
+ if (pm_data.mode >= AT91_PM_ULP0 &&
!at91_pm_verify_clocks())
goto error;
@@ -233,6 +318,7 @@ error:
*/
static void at91_pm_end(void)
{
+ at91_pm_config_ws(pm_data.mode, false);
}
@@ -478,31 +564,28 @@ static void __init at91_pm_sram_init(void)
&at91_pm_suspend_in_sram, at91_pm_suspend_in_sram_sz);
}
-static void __init at91_pm_backup_init(void)
+static bool __init at91_is_pm_mode_active(int pm_mode)
+{
+ return (pm_data.standby_mode == pm_mode ||
+ pm_data.suspend_mode == pm_mode);
+}
+
+static int __init at91_pm_backup_init(void)
{
struct gen_pool *sram_pool;
struct device_node *np;
struct platform_device *pdev = NULL;
+ int ret = -ENODEV;
- if ((pm_data.standby_mode != AT91_PM_BACKUP) &&
- (pm_data.suspend_mode != AT91_PM_BACKUP))
- return;
+ if (!at91_is_pm_mode_active(AT91_PM_BACKUP))
+ return 0;
pm_bu = NULL;
- np = of_find_compatible_node(NULL, NULL, "atmel,sama5d2-shdwc");
- if (!np) {
- pr_warn("%s: failed to find shdwc!\n", __func__);
- return;
- }
-
- pm_data.shdwc = of_iomap(np, 0);
- of_node_put(np);
-
np = of_find_compatible_node(NULL, NULL, "atmel,sama5d2-sfrbu");
if (!np) {
pr_warn("%s: failed to find sfrbu!\n", __func__);
- goto sfrbu_fail;
+ return ret;
}
pm_data.sfrbu = of_iomap(np, 0);
@@ -529,6 +612,7 @@ static void __init at91_pm_backup_init(void)
pm_bu = (void *)gen_pool_alloc(sram_pool, sizeof(struct at91_pm_bu));
if (!pm_bu) {
pr_warn("%s: unable to alloc securam!\n", __func__);
+ ret = -ENOMEM;
goto securam_fail;
}
@@ -536,19 +620,60 @@ static void __init at91_pm_backup_init(void)
pm_bu->canary = __pa_symbol(&canary);
pm_bu->resume = __pa_symbol(cpu_resume);
- return;
+ return 0;
-sfrbu_fail:
- iounmap(pm_data.shdwc);
- pm_data.shdwc = NULL;
securam_fail:
iounmap(pm_data.sfrbu);
pm_data.sfrbu = NULL;
+ return ret;
+}
- if (pm_data.standby_mode == AT91_PM_BACKUP)
- pm_data.standby_mode = AT91_PM_SLOW_CLOCK;
- if (pm_data.suspend_mode == AT91_PM_BACKUP)
- pm_data.suspend_mode = AT91_PM_SLOW_CLOCK;
+static void __init at91_pm_use_default_mode(int pm_mode)
+{
+ if (pm_mode != AT91_PM_ULP1 && pm_mode != AT91_PM_BACKUP)
+ return;
+
+ if (pm_data.standby_mode == pm_mode)
+ pm_data.standby_mode = AT91_PM_ULP0;
+ if (pm_data.suspend_mode == pm_mode)
+ pm_data.suspend_mode = AT91_PM_ULP0;
+}
+
+static void __init at91_pm_modes_init(void)
+{
+ struct device_node *np;
+ int ret;
+
+ if (!at91_is_pm_mode_active(AT91_PM_BACKUP) &&
+ !at91_is_pm_mode_active(AT91_PM_ULP1))
+ return;
+
+ np = of_find_compatible_node(NULL, NULL, "atmel,sama5d2-shdwc");
+ if (!np) {
+ pr_warn("%s: failed to find shdwc!\n", __func__);
+ goto ulp1_default;
+ }
+
+ pm_data.shdwc = of_iomap(np, 0);
+ of_node_put(np);
+
+ ret = at91_pm_backup_init();
+ if (ret) {
+ if (!at91_is_pm_mode_active(AT91_PM_ULP1))
+ goto unmap;
+ else
+ goto backup_default;
+ }
+
+ return;
+
+unmap:
+ iounmap(pm_data.shdwc);
+ pm_data.shdwc = NULL;
+ulp1_default:
+ at91_pm_use_default_mode(AT91_PM_ULP1);
+backup_default:
+ at91_pm_use_default_mode(AT91_PM_BACKUP);
}
struct pmc_info {
@@ -644,7 +769,7 @@ void __init sama5d2_pm_init(void)
if (!IS_ENABLED(CONFIG_SOC_SAMA5D2))
return;
- at91_pm_backup_init();
+ at91_pm_modes_init();
sama5_pm_init();
}
diff --git a/arch/arm/mach-at91/pm.h b/arch/arm/mach-at91/pm.h
index f95d31496f08..9bd4e6ca672a 100644
--- a/arch/arm/mach-at91/pm.h
+++ b/arch/arm/mach-at91/pm.h
@@ -21,8 +21,10 @@
#define AT91_MEMCTRL_SDRAMC 1
#define AT91_MEMCTRL_DDRSDR 2
-#define AT91_PM_SLOW_CLOCK 0x01
-#define AT91_PM_BACKUP 0x02
+#define AT91_PM_STANDBY 0x00
+#define AT91_PM_ULP0 0x01
+#define AT91_PM_ULP1 0x02
+#define AT91_PM_BACKUP 0x03
#ifndef __ASSEMBLY__
struct at91_pm_data {
diff --git a/arch/arm/mach-at91/pm_suspend.S b/arch/arm/mach-at91/pm_suspend.S
index daca91feea6a..a7c6ae13c945 100644
--- a/arch/arm/mach-at91/pm_suspend.S
+++ b/arch/arm/mach-at91/pm_suspend.S
@@ -42,6 +42,15 @@ tmp2 .req r5
.endm
/*
+ * Wait for main oscillator selection is done
+ */
+ .macro wait_moscsels
+1: ldr tmp1, [pmc, #AT91_PMC_SR]
+ tst tmp1, #AT91_PMC_MOSCSELS
+ beq 1b
+ .endm
+
+/*
* Wait until PLLA has locked.
*/
.macro wait_pllalock
@@ -112,19 +121,20 @@ ENTRY(at91_pm_suspend_in_sram)
bl at91_sramc_self_refresh
ldr r0, .pm_mode
- cmp r0, #AT91_PM_SLOW_CLOCK
- beq slow_clock
+ cmp r0, #AT91_PM_STANDBY
+ beq standby
cmp r0, #AT91_PM_BACKUP
beq backup_mode
+ bl at91_ulp_mode
+ b exit_suspend
+
+standby:
/* Wait for interrupt */
ldr pmc, .pmc_base
at91_cpu_idle
b exit_suspend
-slow_clock:
- bl at91_slowck_mode
- b exit_suspend
backup_mode:
bl at91_backup_mode
b exit_suspend
@@ -151,7 +161,102 @@ ENTRY(at91_backup_mode)
str tmp1, [r0, #0]
ENDPROC(at91_backup_mode)
-ENTRY(at91_slowck_mode)
+.macro at91_pm_ulp0_mode
+ ldr pmc, .pmc_base
+
+ /* Turn off the crystal oscillator */
+ ldr tmp1, [pmc, #AT91_CKGR_MOR]
+ bic tmp1, tmp1, #AT91_PMC_MOSCEN
+ orr tmp1, tmp1, #AT91_PMC_KEY
+ str tmp1, [pmc, #AT91_CKGR_MOR]
+
+ /* Wait for interrupt */
+ at91_cpu_idle
+
+ /* Turn on the crystal oscillator */
+ ldr tmp1, [pmc, #AT91_CKGR_MOR]
+ orr tmp1, tmp1, #AT91_PMC_MOSCEN
+ orr tmp1, tmp1, #AT91_PMC_KEY
+ str tmp1, [pmc, #AT91_CKGR_MOR]
+
+ wait_moscrdy
+.endm
+
+/**
+ * Note: This procedure only applies on the platform which uses
+ * the external crystal oscillator as a main clock source.
+ */
+.macro at91_pm_ulp1_mode
+ ldr pmc, .pmc_base
+
+ /* Switch the main clock source to 12-MHz RC oscillator */
+ ldr tmp1, [pmc, #AT91_CKGR_MOR]
+ bic tmp1, tmp1, #AT91_PMC_MOSCSEL
+ bic tmp1, tmp1, #AT91_PMC_KEY_MASK
+ orr tmp1, tmp1, #AT91_PMC_KEY
+ str tmp1, [pmc, #AT91_CKGR_MOR]
+
+ wait_moscsels
+
+ /* Disable the crystal oscillator */
+ ldr tmp1, [pmc, #AT91_CKGR_MOR]
+ bic tmp1, tmp1, #AT91_PMC_MOSCEN
+ bic tmp1, tmp1, #AT91_PMC_KEY_MASK
+ orr tmp1, tmp1, #AT91_PMC_KEY
+ str tmp1, [pmc, #AT91_CKGR_MOR]
+
+ /* Switch the master clock source to main clock */
+ ldr tmp1, [pmc, #AT91_PMC_MCKR]
+ bic tmp1, tmp1, #AT91_PMC_CSS
+ orr tmp1, tmp1, #AT91_PMC_CSS_MAIN
+ str tmp1, [pmc, #AT91_PMC_MCKR]
+
+ wait_mckrdy
+
+ /* Enter the ULP1 mode by set WAITMODE bit in CKGR_MOR */
+ ldr tmp1, [pmc, #AT91_CKGR_MOR]
+ orr tmp1, tmp1, #AT91_PMC_WAITMODE
+ bic tmp1, tmp1, #AT91_PMC_KEY_MASK
+ orr tmp1, tmp1, #AT91_PMC_KEY
+ str tmp1, [pmc, #AT91_CKGR_MOR]
+
+ wait_mckrdy
+
+ /* Enable the crystal oscillator */
+ ldr tmp1, [pmc, #AT91_CKGR_MOR]
+ orr tmp1, tmp1, #AT91_PMC_MOSCEN
+ bic tmp1, tmp1, #AT91_PMC_KEY_MASK
+ orr tmp1, tmp1, #AT91_PMC_KEY
+ str tmp1, [pmc, #AT91_CKGR_MOR]
+
+ wait_moscrdy
+
+ /* Switch the master clock source to slow clock */
+ ldr tmp1, [pmc, #AT91_PMC_MCKR]
+ bic tmp1, tmp1, #AT91_PMC_CSS
+ str tmp1, [pmc, #AT91_PMC_MCKR]
+
+ wait_mckrdy
+
+ /* Switch main clock source to crystal oscillator */
+ ldr tmp1, [pmc, #AT91_CKGR_MOR]
+ orr tmp1, tmp1, #AT91_PMC_MOSCSEL
+ bic tmp1, tmp1, #AT91_PMC_KEY_MASK
+ orr tmp1, tmp1, #AT91_PMC_KEY
+ str tmp1, [pmc, #AT91_CKGR_MOR]
+
+ wait_moscsels
+
+ /* Switch the master clock source to main clock */
+ ldr tmp1, [pmc, #AT91_PMC_MCKR]
+ bic tmp1, tmp1, #AT91_PMC_CSS
+ orr tmp1, tmp1, #AT91_PMC_CSS_MAIN
+ str tmp1, [pmc, #AT91_PMC_MCKR]
+
+ wait_mckrdy
+.endm
+
+ENTRY(at91_ulp_mode)
ldr pmc, .pmc_base
/* Save Master clock setting */
@@ -174,22 +279,19 @@ ENTRY(at91_slowck_mode)
orr tmp1, tmp1, #(1 << 29) /* bit 29 always set */
str tmp1, [pmc, #AT91_CKGR_PLLAR]
- /* Turn off the main oscillator */
- ldr tmp1, [pmc, #AT91_CKGR_MOR]
- bic tmp1, tmp1, #AT91_PMC_MOSCEN
- orr tmp1, tmp1, #AT91_PMC_KEY
- str tmp1, [pmc, #AT91_CKGR_MOR]
+ ldr r0, .pm_mode
+ cmp r0, #AT91_PM_ULP1
+ beq ulp1_mode
- /* Wait for interrupt */
- at91_cpu_idle
+ at91_pm_ulp0_mode
+ b ulp_exit
- /* Turn on the main oscillator */
- ldr tmp1, [pmc, #AT91_CKGR_MOR]
- orr tmp1, tmp1, #AT91_PMC_MOSCEN
- orr tmp1, tmp1, #AT91_PMC_KEY
- str tmp1, [pmc, #AT91_CKGR_MOR]
+ulp1_mode:
+ at91_pm_ulp1_mode
+ b ulp_exit
- wait_moscrdy
+ulp_exit:
+ ldr pmc, .pmc_base
/* Restore PLLA setting */
ldr tmp1, .saved_pllar
@@ -212,7 +314,7 @@ ENTRY(at91_slowck_mode)
wait_mckrdy
mov pc, lr
-ENDPROC(at91_slowck_mode)
+ENDPROC(at91_ulp_mode)
/*
* void at91_sramc_self_refresh(unsigned int is_active)