Merge tag 'soc_drivers_for_4.19' of git://git.kernel.org/pub/scm/linux/kernel/git/ssantosh/linux-keystone into next/drivers

Keystone SOC driver update for 4.19

 -  Add suspend/resume functionality to TI EMIF SRAM driver
 -  Add wakeup M3 RTC self refresh support
 -  Fix for the PM runtime ifdefs

* tag 'soc_drivers_for_4.19' of git://git.kernel.org/pub/scm/linux/kernel/git/ssantosh/linux-keystone:
  soc: ti: wkup_m3_ipc: mark PM functions as __maybe_unused
  soc: ti: wkup_m3_ipc: Add wkup_m3_request_wake_src
  soc: ti: wkup_m3_ipc: Add rtc_only with ddr in self refresh mode support
  memory: ti-emif-sram: Add resume function to recopy sram code

Signed-off-by: Olof Johansson <olof@lixom.net>

1 files changed, 76 insertions, 0 deletions

diff --git a/drivers/soc/ti/wkup_m3_ipc.c b/drivers/soc/ti/wkup_m3_ipc.c
index 369aef5e7228..f5cb8c0af09f 100644
--- a/drivers/soc/ti/wkup_m3_ipc.c
+++ b/drivers/soc/ti/wkup_m3_ipc.c
@@ -46,6 +46,7 @@
 #define M3_BASELINE_VERSION		0x191
 #define M3_STATUS_RESP_MASK		(0xffff << 16)
 #define M3_FW_VERSION_MASK		0xffff
+#define M3_WAKE_SRC_MASK		0xff
 
 #define M3_STATE_UNKNOWN		0
 #define M3_STATE_RESET			1
@@ -55,6 +56,23 @@
 
 static struct wkup_m3_ipc *m3_ipc_state;
 
+static const struct wkup_m3_wakeup_src wakeups[] = {
+	{.irq_nr = 35,	.src = "USB0_PHY"},
+	{.irq_nr = 36,	.src = "USB1_PHY"},
+	{.irq_nr = 40,	.src = "I2C0"},
+	{.irq_nr = 41,	.src = "RTC Timer"},
+	{.irq_nr = 42,	.src = "RTC Alarm"},
+	{.irq_nr = 43,	.src = "Timer0"},
+	{.irq_nr = 44,	.src = "Timer1"},
+	{.irq_nr = 45,	.src = "UART"},
+	{.irq_nr = 46,	.src = "GPIO0"},
+	{.irq_nr = 48,	.src = "MPU_WAKE"},
+	{.irq_nr = 49,	.src = "WDT0"},
+	{.irq_nr = 50,	.src = "WDT1"},
+	{.irq_nr = 51,	.src = "ADC_TSC"},
+	{.irq_nr = 0,	.src = "Unknown"},
+};
+
 static void am33xx_txev_eoi(struct wkup_m3_ipc *m3_ipc)
 {
 	writel(AM33XX_M3_TXEV_ACK,
@@ -329,12 +347,45 @@ static int wkup_m3_finish_low_power(struct wkup_m3_ipc *m3_ipc)
 	return 0;
 }
 
+/**
+ * wkup_m3_request_wake_src - Get the wakeup source info passed from wkup_m3
+ * @m3_ipc: Pointer to wkup_m3_ipc context
+ */
+static const char *wkup_m3_request_wake_src(struct wkup_m3_ipc *m3_ipc)
+{
+	unsigned int wakeup_src_idx;
+	int j, val;
+
+	val = wkup_m3_ctrl_ipc_read(m3_ipc, 6);
+
+	wakeup_src_idx = val & M3_WAKE_SRC_MASK;
+
+	for (j = 0; j < ARRAY_SIZE(wakeups) - 1; j++) {
+		if (wakeups[j].irq_nr == wakeup_src_idx)
+			return wakeups[j].src;
+	}
+	return wakeups[j].src;
+}
+
+/**
+ * wkup_m3_set_rtc_only - Set the rtc_only flag
+ * @wkup_m3_wakeup: struct wkup_m3_wakeup_src * gets assigned the
+ *                  wakeup src value
+ */
+static void wkup_m3_set_rtc_only(struct wkup_m3_ipc *m3_ipc)
+{
+	if (m3_ipc_state)
+		m3_ipc_state->is_rtc_only = true;
+}
+
 static struct wkup_m3_ipc_ops ipc_ops = {
 	.set_mem_type = wkup_m3_set_mem_type,
 	.set_resume_address = wkup_m3_set_resume_address,
 	.prepare_low_power = wkup_m3_prepare_low_power,
 	.finish_low_power = wkup_m3_finish_low_power,
 	.request_pm_status = wkup_m3_request_pm_status,
+	.request_wake_src = wkup_m3_request_wake_src,
+	.set_rtc_only = wkup_m3_set_rtc_only,
 };
 
 /**
@@ -484,6 +535,30 @@ static int wkup_m3_ipc_remove(struct platform_device *pdev)
 	return 0;
 }
 
+static int __maybe_unused wkup_m3_ipc_suspend(struct device *dev)
+{
+	/*
+	 * Nothing needs to be done on suspend even with rtc_only flag set
+	 */
+	return 0;
+}
+
+static int __maybe_unused wkup_m3_ipc_resume(struct device *dev)
+{
+	if (m3_ipc_state->is_rtc_only) {
+		rproc_shutdown(m3_ipc_state->rproc);
+		rproc_boot(m3_ipc_state->rproc);
+	}
+
+	m3_ipc_state->is_rtc_only = false;
+
+	return 0;
+}
+
+static const struct dev_pm_ops wkup_m3_ipc_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(wkup_m3_ipc_suspend, wkup_m3_ipc_resume)
+};
+
 static const struct of_device_id wkup_m3_ipc_of_match[] = {
 	{ .compatible = "ti,am3352-wkup-m3-ipc", },
 	{ .compatible = "ti,am4372-wkup-m3-ipc", },
@@ -497,6 +572,7 @@ static struct platform_driver wkup_m3_ipc_driver = {
 	.driver = {
 		.name = "wkup_m3_ipc",
 		.of_match_table = wkup_m3_ipc_of_match,
+		.pm = &wkup_m3_ipc_pm_ops,
 	},
 };