[PATCH v4 08/10] platform/x86/intel/pmt: add register access helpers

[Michael J. Ruhl]

The control register is used in a read/modify/write pattern.
The status register is used in a read/check bit pattern.

Add helpers to eliminate common code.

Signed-off-by: Michael J. Ruhl <michael.j.ruhl at intel.com>
---
 drivers/platform/x86/intel/pmt/crashlog.c | 58 +++++++++++------------
 1 file changed, 29 insertions(+), 29 deletions(-)

diff --git a/drivers/platform/x86/intel/pmt/crashlog.c b/drivers/platform/x86/intel/pmt/crashlog.c
index 99f0e85f2de6..e11865686f2a 100644
--- a/drivers/platform/x86/intel/pmt/crashlog.c
+++ b/drivers/platform/x86/intel/pmt/crashlog.c
@@ -63,20 +63,40 @@ struct pmt_crashlog_priv {
 /*
  * I/O
  */
-static bool pmt_crashlog_complete(struct intel_pmt_entry *entry)
+#define SET	true
+#define CLEAR	false
+
+static void read_modify_write(struct intel_pmt_entry *entry, u32 bit, bool set)
 {
-	u32 control = readl(entry->disc_table + CONTROL_OFFSET);
+	u32 reg = readl(entry->disc_table + CONTROL_OFFSET);
+
+	reg &= ~CRASHLOG_FLAG_TRIGGER_MASK;
+
+	if (set)
+		reg |= bit;
+	else
+		reg &= bit;
+
+	writel(reg, entry->disc_table + CONTROL_OFFSET);
+}
+
+static bool read_check(struct intel_pmt_entry *entry, u32 bit)
+{
+	u32 reg = readl(entry->disc_table + CONTROL_OFFSET);
+
+	return !!(reg & bit);
+}
 
+static bool pmt_crashlog_complete(struct intel_pmt_entry *entry)
+{
 	/* return current value of the crashlog complete flag */
-	return !!(control & CRASHLOG_FLAG_TRIGGER_COMPLETE);
+	return read_check(entry, CRASHLOG_FLAG_TRIGGER_COMPLETE);
 }
 
 static bool pmt_crashlog_disabled(struct intel_pmt_entry *entry)
 {
-	u32 control = readl(entry->disc_table + CONTROL_OFFSET);
-
 	/* return current value of the crashlog disabled flag */
-	return !!(control & CRASHLOG_FLAG_DISABLE);
+	return read_check(entry, CRASHLOG_FLAG_DISABLE);
 }
 
 static bool pmt_crashlog_supported(struct intel_pmt_entry *entry)
@@ -97,37 +117,17 @@ static bool pmt_crashlog_supported(struct intel_pmt_entry *entry)
 static void pmt_crashlog_set_disable(struct intel_pmt_entry *entry,
 				     bool disable)
 {
-	u32 control = readl(entry->disc_table + CONTROL_OFFSET);
-
-	/* clear trigger bits so we are only modifying disable flag */
-	control &= ~CRASHLOG_FLAG_TRIGGER_MASK;
-
-	if (disable)
-		control |= CRASHLOG_FLAG_DISABLE;
-	else
-		control &= ~CRASHLOG_FLAG_DISABLE;
-
-	writel(control, entry->disc_table + CONTROL_OFFSET);
+	read_modify_write(entry, CRASHLOG_FLAG_DISABLE, disable);
 }
 
 static void pmt_crashlog_set_clear(struct intel_pmt_entry *entry)
 {
-	u32 control = readl(entry->disc_table + CONTROL_OFFSET);
-
-	control &= ~CRASHLOG_FLAG_TRIGGER_MASK;
-	control |= CRASHLOG_FLAG_TRIGGER_CLEAR;
-
-	writel(control, entry->disc_table + CONTROL_OFFSET);
+	read_modify_write(entry, CRASHLOG_FLAG_TRIGGER_CLEAR, SET);
 }
 
 static void pmt_crashlog_set_execute(struct intel_pmt_entry *entry)
 {
-	u32 control = readl(entry->disc_table + CONTROL_OFFSET);
-
-	control &= ~CRASHLOG_FLAG_TRIGGER_MASK;
-	control |= CRASHLOG_FLAG_TRIGGER_EXECUTE;
-
-	writel(control, entry->disc_table + CONTROL_OFFSET);
+	read_modify_write(entry, CRASHLOG_FLAG_TRIGGER_EXECUTE, SET);
 }
 
 /*
-- 
2.49.0