xtensa: s6000 variant
Support for the Stretch S6000 Xtensa core variant.
Signed-off-by: Johannes Weiner <jw@emlix.com>
Signed-off-by: Oskar Schirmer <os@emlix.com>
Signed-off-by: Chris Zankel <chris@zankel.net>
diff --git a/arch/xtensa/variants/s6000/irq.c b/arch/xtensa/variants/s6000/irq.c
new file mode 100644
index 0000000..6651e32
--- /dev/null
+++ b/arch/xtensa/variants/s6000/irq.c
@@ -0,0 +1,74 @@
+/*
+ * s6000 irq crossbar
+ *
+ * Copyright (c) 2009 emlix GmbH
+ * Authors: Johannes Weiner <jw@emlix.com>
+ * Oskar Schirmer <os@emlix.com>
+ */
+#include <linux/io.h>
+#include <asm/irq.h>
+#include <variant/hardware.h>
+
+/* S6_REG_INTC */
+#define INTC_STATUS 0x000
+#define INTC_RAW 0x010
+#define INTC_STATUS_AG 0x100
+#define INTC_CFG(n) (0x200 + 4 * (n))
+
+/*
+ * The s6000 has a crossbar that multiplexes interrupt output lines
+ * from the peripherals to input lines on the xtensa core.
+ *
+ * We leave the mapping decisions to the platform as it depends on the
+ * actually connected peripherals which distribution makes sense.
+ */
+extern const signed char *platform_irq_mappings[NR_IRQS];
+
+static unsigned long scp_to_intc_enable[] = {
+#define TO_INTC_ENABLE(n) (((n) << 1) + 1)
+ TO_INTC_ENABLE(0),
+ TO_INTC_ENABLE(1),
+ TO_INTC_ENABLE(2),
+ TO_INTC_ENABLE(3),
+ TO_INTC_ENABLE(4),
+ TO_INTC_ENABLE(5),
+ TO_INTC_ENABLE(6),
+ TO_INTC_ENABLE(7),
+ TO_INTC_ENABLE(8),
+ TO_INTC_ENABLE(9),
+ TO_INTC_ENABLE(10),
+ TO_INTC_ENABLE(11),
+ TO_INTC_ENABLE(12),
+ -1,
+ -1,
+ TO_INTC_ENABLE(13),
+ -1,
+ TO_INTC_ENABLE(14),
+ -1,
+ TO_INTC_ENABLE(15),
+#undef TO_INTC_ENABLE
+};
+
+static void irq_set(unsigned int irq, int enable)
+{
+ unsigned long en;
+ const signed char *m = platform_irq_mappings[irq];
+
+ if (!m)
+ return;
+ en = enable ? scp_to_intc_enable[irq] : 0;
+ while (*m >= 0) {
+ writel(en, S6_REG_INTC + INTC_CFG(*m));
+ m++;
+ }
+}
+
+void variant_irq_enable(unsigned int irq)
+{
+ irq_set(irq, 1);
+}
+
+void variant_irq_disable(unsigned int irq)
+{
+ irq_set(irq, 0);
+}