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Message-Id: <20200703160731.53698-2-tony@atomide.com>
Date: Fri, 3 Jul 2020 09:07:29 -0700
From: Tony Lindgren <tony@...mide.com>
To: linux-omap@...r.kernel.org
Cc: "Andrew F . Davis" <afd@...com>, Dave Gerlach <d-gerlach@...com>,
Faiz Abbas <faiz_abbas@...com>,
Santosh Shilimkar <ssantosh@...nel.org>,
Suman Anna <s-anna@...com>, Tero Kristo <t-kristo@...com>,
linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
Keerthy <j-keerthy@...com>
Subject: [PATCH 1/3] soc: ti: pm33xx: Simplify RTC usage to prepare to drop platform data
We must re-enable the RTC module clock enabled in RTC+DDR suspend, and
pm33xx has been using platform data callbacks for that. Looks like for
retention suspend the RTC module clock must not be re-enabled.
To remove the legacy platform data callbacks, and eventually be able to
drop the RTC legacy platform data, let's manage the RTC module clock
and register range directly in pm33xx.
Signed-off-by: Tony Lindgren <tony@...mide.com>
---
arch/arm/mach-omap2/pm33xx-core.c | 25 ---------------
drivers/soc/ti/pm33xx.c | 47 +++++++++++++++++++++++++---
include/linux/platform_data/pm33xx.h | 3 --
3 files changed, 42 insertions(+), 33 deletions(-)
diff --git a/arch/arm/mach-omap2/pm33xx-core.c b/arch/arm/mach-omap2/pm33xx-core.c
--- a/arch/arm/mach-omap2/pm33xx-core.c
+++ b/arch/arm/mach-omap2/pm33xx-core.c
@@ -25,7 +25,6 @@
#include "control.h"
#include "clockdomain.h"
#include "iomap.h"
-#include "omap_hwmod.h"
#include "pm.h"
#include "powerdomain.h"
#include "prm33xx.h"
@@ -36,7 +35,6 @@
static struct powerdomain *cefuse_pwrdm, *gfx_pwrdm, *per_pwrdm, *mpu_pwrdm;
static struct clockdomain *gfx_l4ls_clkdm;
static void __iomem *scu_base;
-static struct omap_hwmod *rtc_oh;
static int (*idle_fn)(u32 wfi_flags);
@@ -267,13 +265,6 @@ static struct am33xx_pm_sram_addr *amx3_get_sram_addrs(void)
return NULL;
}
-static void __iomem *am43xx_get_rtc_base_addr(void)
-{
- rtc_oh = omap_hwmod_lookup("rtc");
-
- return omap_hwmod_get_mpu_rt_va(rtc_oh);
-}
-
static void am43xx_save_context(void)
{
}
@@ -297,16 +288,6 @@ static void am43xx_restore_context(void)
writel_relaxed(0x0, AM33XX_L4_WK_IO_ADDRESS(0x44df2e14));
}
-static void am43xx_prepare_rtc_suspend(void)
-{
- omap_hwmod_enable(rtc_oh);
-}
-
-static void am43xx_prepare_rtc_resume(void)
-{
- omap_hwmod_idle(rtc_oh);
-}
-
static struct am33xx_pm_platform_data am33xx_ops = {
.init = am33xx_suspend_init,
.deinit = amx3_suspend_deinit,
@@ -317,10 +298,7 @@ static struct am33xx_pm_platform_data am33xx_ops = {
.get_sram_addrs = amx3_get_sram_addrs,
.save_context = am33xx_save_context,
.restore_context = am33xx_restore_context,
- .prepare_rtc_suspend = am43xx_prepare_rtc_suspend,
- .prepare_rtc_resume = am43xx_prepare_rtc_resume,
.check_off_mode_enable = am33xx_check_off_mode_enable,
- .get_rtc_base_addr = am43xx_get_rtc_base_addr,
};
static struct am33xx_pm_platform_data am43xx_ops = {
@@ -333,10 +311,7 @@ static struct am33xx_pm_platform_data am43xx_ops = {
.get_sram_addrs = amx3_get_sram_addrs,
.save_context = am43xx_save_context,
.restore_context = am43xx_restore_context,
- .prepare_rtc_suspend = am43xx_prepare_rtc_suspend,
- .prepare_rtc_resume = am43xx_prepare_rtc_resume,
.check_off_mode_enable = am43xx_check_off_mode_enable,
- .get_rtc_base_addr = am43xx_get_rtc_base_addr,
};
static struct am33xx_pm_platform_data *am33xx_pm_get_pdata(void)
diff --git a/drivers/soc/ti/pm33xx.c b/drivers/soc/ti/pm33xx.c
--- a/drivers/soc/ti/pm33xx.c
+++ b/drivers/soc/ti/pm33xx.c
@@ -16,6 +16,7 @@
#include <linux/module.h>
#include <linux/nvmem-consumer.h>
#include <linux/of.h>
+#include <linux/of_address.h>
#include <linux/platform_data/pm33xx.h>
#include <linux/platform_device.h>
#include <linux/rtc.h>
@@ -39,6 +40,8 @@
#define GIC_INT_SET_PENDING_BASE 0x200
#define AM43XX_GIC_DIST_BASE 0x48241000
+static void __iomem *rtc_base_virt;
+static struct clk *rtc_fck;
static u32 rtc_magic_val;
static int (*am33xx_do_wfi_sram)(unsigned long unused);
@@ -90,7 +93,7 @@ static int am33xx_push_sram_idle(void)
ro_sram_data.amx3_pm_sram_data_virt = ocmcram_location_data;
ro_sram_data.amx3_pm_sram_data_phys =
gen_pool_virt_to_phys(sram_pool_data, ocmcram_location_data);
- ro_sram_data.rtc_base_virt = pm_ops->get_rtc_base_addr();
+ ro_sram_data.rtc_base_virt = rtc_base_virt;
/* Save physical address to calculate resume offset during pm init */
am33xx_do_wfi_sram_phys = gen_pool_virt_to_phys(sram_pool,
@@ -158,7 +161,7 @@ static struct wkup_m3_wakeup_src rtc_wake_src(void)
{
u32 i;
- i = __raw_readl(pm_ops->get_rtc_base_addr() + 0x44) & 0x40;
+ i = __raw_readl(rtc_base_virt + 0x44) & 0x40;
if (i) {
retrigger_irq = rtc_alarm_wakeup.irq_nr;
@@ -177,13 +180,24 @@ static int am33xx_rtc_only_idle(unsigned long wfi_flags)
return 0;
}
+/*
+ * Note that the RTC module clock must be re-enabled only for rtc+ddr suspend.
+ * And looks like the module can stay in SYSC_IDLE_SMART_WKUP mode configured
+ * by the interconnect code just fine for both rtc+ddr suspend and retention
+ * suspend.
+ */
static int am33xx_pm_suspend(suspend_state_t suspend_state)
{
int i, ret = 0;
if (suspend_state == PM_SUSPEND_MEM &&
pm_ops->check_off_mode_enable()) {
- pm_ops->prepare_rtc_suspend();
+ ret = clk_prepare_enable(rtc_fck);
+ if (ret) {
+ dev_err(pm33xx_dev, "Failed to enable clock: %i\n", ret);
+ return ret;
+ }
+
pm_ops->save_context();
suspend_wfi_flags |= WFI_FLAG_RTC_ONLY;
clk_save_context();
@@ -236,7 +250,7 @@ static int am33xx_pm_suspend(suspend_state_t suspend_state)
}
if (suspend_state == PM_SUSPEND_MEM && pm_ops->check_off_mode_enable())
- pm_ops->prepare_rtc_resume();
+ clk_disable_unprepare(rtc_fck);
return ret;
}
@@ -425,14 +439,28 @@ static int am33xx_pm_rtc_setup(void)
struct device_node *np;
unsigned long val = 0;
struct nvmem_device *nvmem;
+ int error;
np = of_find_node_by_name(NULL, "rtc");
if (of_device_is_available(np)) {
+ /* RTC interconnect target module clock */
+ rtc_fck = of_clk_get_by_name(np->parent, "fck");
+ if (IS_ERR(rtc_fck))
+ return PTR_ERR(rtc_fck);
+
+ rtc_base_virt = of_iomap(np, 0);
+ if (!rtc_base_virt) {
+ pr_warn("PM: could not iomap rtc");
+ error = -ENODEV;
+ goto err_clk_put;
+ }
+
omap_rtc = rtc_class_open("rtc0");
if (!omap_rtc) {
pr_warn("PM: rtc0 not available");
- return -EPROBE_DEFER;
+ error = -EPROBE_DEFER;
+ goto err_iounmap;
}
nvmem = devm_nvmem_device_get(&omap_rtc->dev,
@@ -454,6 +482,13 @@ static int am33xx_pm_rtc_setup(void)
}
return 0;
+
+err_iounmap:
+ iounmap(rtc_base_virt);
+err_clk_put:
+ clk_put(rtc_fck);
+
+ return error;
}
static int am33xx_pm_probe(struct platform_device *pdev)
@@ -544,6 +579,8 @@ static int am33xx_pm_remove(struct platform_device *pdev)
suspend_set_ops(NULL);
wkup_m3_ipc_put(m3_ipc);
am33xx_pm_free_sram();
+ iounmap(rtc_base_virt);
+ clk_put(rtc_fck);
return 0;
}
diff --git a/include/linux/platform_data/pm33xx.h b/include/linux/platform_data/pm33xx.h
--- a/include/linux/platform_data/pm33xx.h
+++ b/include/linux/platform_data/pm33xx.h
@@ -54,11 +54,8 @@ struct am33xx_pm_platform_data {
void (*begin_suspend)(void);
void (*finish_suspend)(void);
struct am33xx_pm_sram_addr *(*get_sram_addrs)(void);
- void __iomem *(*get_rtc_base_addr)(void);
void (*save_context)(void);
void (*restore_context)(void);
- void (*prepare_rtc_suspend)(void);
- void (*prepare_rtc_resume)(void);
int (*check_off_mode_enable)(void);
};
--
2.27.0
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