arm: introduce cross trigger interface helpers

OMAP4 uses cross trigger interface(CTI) to route
performance monitor irq to GIC, so introduce cti
helpers to make access for cti easily.

Acked-by: Jean Pihet <j-pihet@ti.com>
Signed-off-by: Ming Lei <ming.lei@canonical.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>

1 files changed, 179 insertions, 0 deletions

diff --git a/arch/arm/include/asm/cti.h b/arch/arm/include/asm/cti.h
new file mode 100644
index 000000000000..a0ada3ea4358
--- /dev/null
+++ b/arch/arm/include/asm/cti.h
@@ -0,0 +1,179 @@
+#ifndef __ASMARM_CTI_H
+#define __ASMARM_CTI_H
+
+#include        <asm/io.h>
+
+/* The registers' definition is from section 3.2 of
+ * Embedded Cross Trigger Revision: r0p0
+ */
+#define         CTICONTROL              0x000
+#define         CTISTATUS               0x004
+#define         CTILOCK                 0x008
+#define         CTIPROTECTION           0x00C
+#define         CTIINTACK               0x010
+#define         CTIAPPSET               0x014
+#define         CTIAPPCLEAR             0x018
+#define         CTIAPPPULSE             0x01c
+#define         CTIINEN                 0x020
+#define         CTIOUTEN                0x0A0
+#define         CTITRIGINSTATUS         0x130
+#define         CTITRIGOUTSTATUS        0x134
+#define         CTICHINSTATUS           0x138
+#define         CTICHOUTSTATUS          0x13c
+#define         CTIPERIPHID0            0xFE0
+#define         CTIPERIPHID1            0xFE4
+#define         CTIPERIPHID2            0xFE8
+#define         CTIPERIPHID3            0xFEC
+#define         CTIPCELLID0             0xFF0
+#define         CTIPCELLID1             0xFF4
+#define         CTIPCELLID2             0xFF8
+#define         CTIPCELLID3             0xFFC
+
+/* The below are from section 3.6.4 of
+ * CoreSight v1.0 Architecture Specification
+ */
+#define         LOCKACCESS              0xFB0
+#define         LOCKSTATUS              0xFB4
+
+/* write this value to LOCKACCESS will unlock the module, and
+ * other value will lock the module
+ */
+#define         LOCKCODE                0xC5ACCE55
+
+/**
+ * struct cti - cross trigger interface struct
+ * @base: mapped virtual address for the cti base
+ * @irq: irq number for the cti
+ * @trig_out_for_irq: triger out number which will cause
+ *      the @irq happen
+ *
+ * cti struct used to operate cti registers.
+ */
+struct cti {
+        void __iomem *base;
+        int irq;
+        int trig_out_for_irq;
+};
+
+/**
+ * cti_init - initialize the cti instance
+ * @cti: cti instance
+ * @base: mapped virtual address for the cti base
+ * @irq: irq number for the cti
+ * @trig_out: triger out number which will cause
+ *      the @irq happen
+ *
+ * called by machine code to pass the board dependent
+ * @base, @irq and @trig_out to cti.
+ */
+static inline void cti_init(struct cti *cti,
+        void __iomem *base, int irq, int trig_out)
+{
+        cti->base = base;
+        cti->irq  = irq;
+        cti->trig_out_for_irq = trig_out;
+}
+
+/**
+ * cti_map_trigger - use the @chan to map @trig_in to @trig_out
+ * @cti: cti instance
+ * @trig_in: trigger in number
+ * @trig_out: trigger out number
+ * @channel: channel number
+ *
+ * This function maps one trigger in of @trig_in to one trigger
+ * out of @trig_out using the channel @chan.
+ */
+static inline void cti_map_trigger(struct cti *cti,
+        int trig_in, int trig_out, int chan)
+{
+        void __iomem *base = cti->base;
+        unsigned long val;
+
+        val = __raw_readl(base + CTIINEN + trig_in * 4);
+        val |= BIT(chan);
+        __raw_writel(val, base + CTIINEN + trig_in * 4);
+
+        val = __raw_readl(base + CTIOUTEN + trig_out * 4);
+        val |= BIT(chan);
+        __raw_writel(val, base + CTIOUTEN + trig_out * 4);
+}
+
+/**
+ * cti_enable - enable the cti module
+ * @cti: cti instance
+ *
+ * enable the cti module
+ */
+static inline void cti_enable(struct cti *cti)
+{
+        __raw_writel(0x1, cti->base + CTICONTROL);
+}
+
+/**
+ * cti_disable - disable the cti module
+ * @cti: cti instance
+ *
+ * enable the cti module
+ */
+static inline void cti_disable(struct cti *cti)
+{
+        __raw_writel(0, cti->base + CTICONTROL);
+}
+
+/**
+ * cti_irq_ack - clear the cti irq
+ * @cti: cti instance
+ *
+ * clear the cti irq
+ */
+static inline void cti_irq_ack(struct cti *cti)
+{
+        void __iomem *base = cti->base;
+        unsigned long val;
+
+        val = __raw_readl(base + CTIINTACK);
+        val |= BIT(cti->trig_out_for_irq);
+        __raw_writel(val, base + CTIINTACK);
+}
+
+/**
+ * cti_unlock - unlock cti module
+ * @cti: cti instance
+ *
+ * unlock the cti module, or else any writes to the cti
+ * module is not allowed.
+ */
+static inline void cti_unlock(struct cti *cti)
+{
+        void __iomem *base = cti->base;
+        unsigned long val;
+
+        val = __raw_readl(base + LOCKSTATUS);
+
+        if (val & 1) {
+                val = LOCKCODE;
+                __raw_writel(val, base + LOCKACCESS);
+        }
+}
+
+/**
+ * cti_lock - lock cti module
+ * @cti: cti instance
+ *
+ * lock the cti module, so any writes to the cti
+ * module will be not allowed.
+ */
+static inline void cti_lock(struct cti *cti)
+{
+        void __iomem *base = cti->base;
+        unsigned long val;
+
+        val = __raw_readl(base + LOCKSTATUS);
+
+        if (!(val & 1)) {
+                val = ~LOCKCODE;
+                __raw_writel(val, base + LOCKACCESS);
+        }
+}
+#endif