[PATCH v7 9/9] acpi/arm64: Add SBSA Generic Watchdog support in GTDT driver

[fu . wei]

From: Fu Wei 

This driver adds support for parsing SBSA Generic Watchdog timer
in GTDT, parse all info in SBSA Generic Watchdog Structure in GTDT,
and creating a platform device with that information.

This allows the operating system to obtain device data from the
resource of platform device. The platform device named "sbsa-gwdt"
can be used by the ARM SBSA Generic Watchdog driver.

Signed-off-by: Fu Wei 
Signed-off-by: Hanjun Guo 
---
 drivers/acpi/arm64/acpi_gtdt.c | 83 ++
 drivers/watchdog/Kconfig   |  1 +
 2 files changed, 84 insertions(+)

diff --git a/drivers/acpi/arm64/acpi_gtdt.c b/drivers/acpi/arm64/acpi_gtdt.c
index ff62953..eb3edac 100644
--- a/drivers/acpi/arm64/acpi_gtdt.c
+++ b/drivers/acpi/arm64/acpi_gtdt.c
@@ -15,6 +15,7 @@
 #include 
 #include 
 #include 
+#include 
 
 #include 
 
@@ -258,3 +259,85 @@ int __init gtdt_arch_timer_mem_init(struct gt_block_data 
*data)
 
return index;
 }
+
+/*
+ * Initialize a SBSA generic Watchdog platform device info from GTDT
+ */
+static int __init gtdt_import_sbsa_gwdt(void *platform_timer, int index)
+{
+   struct platform_device *pdev;
+   struct acpi_gtdt_watchdog *wd = platform_timer;
+   int irq = map_generic_timer_interrupt(wd->timer_interrupt,
+ wd->timer_flags);
+   int no_irq = 1;
+
+   /*
+* According to SBSA specification the size of refresh and control
+* frames of SBSA Generic Watchdog is SZ_4K(Offset 0x000 – 0xFFF).
+*/
+   struct resource res[] = {
+   DEFINE_RES_MEM(wd->control_frame_address, SZ_4K),
+   DEFINE_RES_MEM(wd->refresh_frame_address, SZ_4K),
+   DEFINE_RES_IRQ(irq),
+   };
+
+   pr_debug("a Watchdog GT(0x%llx/0x%llx gsi:%u flags:0x%x).\n",
+wd->refresh_frame_address, wd->control_frame_address,
+wd->timer_interrupt, wd->timer_flags);
+
+   if (!(wd->refresh_frame_address && wd->control_frame_address)) {
+   pr_err(FW_BUG "failed getting the Watchdog GT frame addr.\n");
+   return -EINVAL;
+   }
+
+   if (!wd->timer_interrupt)
+   pr_warn(FW_BUG "failed getting the Watchdog GT GSIV.\n");
+   else if (irq <= 0)
+   pr_warn("failed to map the Watchdog GT GSIV.\n");
+   else
+   no_irq = 0;
+
+   /*
+* Add a platform device named "sbsa-gwdt" to match the platform driver.
+* "sbsa-gwdt": SBSA(Server Base System Architecture) Generic Watchdog
+* The platform driver (like drivers/watchdog/sbsa_gwdt.c)can get device
+* info below by matching this name.
+*/
+   pdev = platform_device_register_simple("sbsa-gwdt", index, res,
+  ARRAY_SIZE(res) - no_irq);
+   if (IS_ERR(pdev)) {
+   acpi_unregister_gsi(wd->timer_interrupt);
+   return PTR_ERR(pdev);
+   }
+
+   return 0;
+}
+
+static int __init gtdt_sbsa_gwdt_init(void)
+{
+   struct acpi_table_header *table;
+   void *platform_timer;
+   int index = 0;
+
+   if (acpi_disabled)
+   return 0;
+
+   if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_GTDT, 0, )))
+   return -EINVAL;
+
+   if (acpi_gtdt_desc_init(table) < 0)
+   return -EINVAL;
+
+   for_each_platform_timer(platform_timer) {
+   if (is_watchdog(platform_timer) &&
+   !gtdt_import_sbsa_gwdt(platform_timer, index))
+   index++;
+   }
+
+   if (index)
+   pr_info("found %d SBSA generic Watchdog.\n", index);
+
+   return 0;
+}
+
+device_initcall(gtdt_sbsa_gwdt_init);
diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index b4b3e25..105f059 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -207,6 +207,7 @@ config ARM_SBSA_WATCHDOG
depends on ARM64
depends on ARM_ARCH_TIMER
select WATCHDOG_CORE
+   select ACPI_GTDT if ACPI
help
  ARM SBSA Generic Watchdog has two stage timeouts:
  the first signal (WS0) is for alerting the system by interrupt,
-- 
2.5.5

[PATCH v7 9/9] acpi/arm64: Add SBSA Generic Watchdog support in GTDT driver

[fu . wei]

From: Fu Wei 

This driver adds support for parsing SBSA Generic Watchdog timer
in GTDT, parse all info in SBSA Generic Watchdog Structure in GTDT,
and creating a platform device with that information.

This allows the operating system to obtain device data from the
resource of platform device. The platform device named "sbsa-gwdt"
can be used by the ARM SBSA Generic Watchdog driver.

Signed-off-by: Fu Wei 
Signed-off-by: Hanjun Guo 
---
 drivers/acpi/arm64/acpi_gtdt.c | 83 ++
 drivers/watchdog/Kconfig   |  1 +
 2 files changed, 84 insertions(+)

diff --git a/drivers/acpi/arm64/acpi_gtdt.c b/drivers/acpi/arm64/acpi_gtdt.c
index ff62953..eb3edac 100644
--- a/drivers/acpi/arm64/acpi_gtdt.c
+++ b/drivers/acpi/arm64/acpi_gtdt.c
@@ -15,6 +15,7 @@
 #include 
 #include 
 #include 
+#include 
 
 #include 
 
@@ -258,3 +259,85 @@ int __init gtdt_arch_timer_mem_init(struct gt_block_data 
*data)
 
return index;
 }
+
+/*
+ * Initialize a SBSA generic Watchdog platform device info from GTDT
+ */
+static int __init gtdt_import_sbsa_gwdt(void *platform_timer, int index)
+{
+   struct platform_device *pdev;
+   struct acpi_gtdt_watchdog *wd = platform_timer;
+   int irq = map_generic_timer_interrupt(wd->timer_interrupt,
+ wd->timer_flags);
+   int no_irq = 1;
+
+   /*
+* According to SBSA specification the size of refresh and control
+* frames of SBSA Generic Watchdog is SZ_4K(Offset 0x000 – 0xFFF).
+*/
+   struct resource res[] = {
+   DEFINE_RES_MEM(wd->control_frame_address, SZ_4K),
+   DEFINE_RES_MEM(wd->refresh_frame_address, SZ_4K),
+   DEFINE_RES_IRQ(irq),
+   };
+
+   pr_debug("a Watchdog GT(0x%llx/0x%llx gsi:%u flags:0x%x).\n",
+wd->refresh_frame_address, wd->control_frame_address,
+wd->timer_interrupt, wd->timer_flags);
+
+   if (!(wd->refresh_frame_address && wd->control_frame_address)) {
+   pr_err(FW_BUG "failed getting the Watchdog GT frame addr.\n");
+   return -EINVAL;
+   }
+
+   if (!wd->timer_interrupt)
+   pr_warn(FW_BUG "failed getting the Watchdog GT GSIV.\n");
+   else if (irq <= 0)
+   pr_warn("failed to map the Watchdog GT GSIV.\n");
+   else
+   no_irq = 0;
+
+   /*
+* Add a platform device named "sbsa-gwdt" to match the platform driver.
+* "sbsa-gwdt": SBSA(Server Base System Architecture) Generic Watchdog
+* The platform driver (like drivers/watchdog/sbsa_gwdt.c)can get device
+* info below by matching this name.
+*/
+   pdev = platform_device_register_simple("sbsa-gwdt", index, res,
+  ARRAY_SIZE(res) - no_irq);
+   if (IS_ERR(pdev)) {
+   acpi_unregister_gsi(wd->timer_interrupt);
+   return PTR_ERR(pdev);
+   }
+
+   return 0;
+}
+
+static int __init gtdt_sbsa_gwdt_init(void)
+{
+   struct acpi_table_header *table;
+   void *platform_timer;
+   int index = 0;
+
+   if (acpi_disabled)
+   return 0;
+
+   if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_GTDT, 0, )))
+   return -EINVAL;
+
+   if (acpi_gtdt_desc_init(table) < 0)
+   return -EINVAL;
+
+   for_each_platform_timer(platform_timer) {
+   if (is_watchdog(platform_timer) &&
+   !gtdt_import_sbsa_gwdt(platform_timer, index))
+   index++;
+   }
+
+   if (index)
+   pr_info("found %d SBSA generic Watchdog.\n", index);
+
+   return 0;
+}
+
+device_initcall(gtdt_sbsa_gwdt_init);
diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index b4b3e25..105f059 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -207,6 +207,7 @@ config ARM_SBSA_WATCHDOG
depends on ARM64
depends on ARM_ARCH_TIMER
select WATCHDOG_CORE
+   select ACPI_GTDT if ACPI
help
  ARM SBSA Generic Watchdog has two stage timeouts:
  the first signal (WS0) is for alerting the system by interrupt,
-- 
2.5.5