--- /dev/null
+#ifndef _METAG_L2CACHE_H
+#define _METAG_L2CACHE_H
+
+#ifdef CONFIG_METAG_L2C
+
+#include <asm/global_lock.h>
+#include <asm/io.h>
+
+/*
+ * Store the last known value of pfenable (we don't want prefetch enabled while
+ * L2 is off).
+ */
+extern int l2c_pfenable;
+
+/* defined in arch/metag/drivers/core-sysfs.c */
+extern struct sysdev_class cache_sysclass;
+
+static inline void wr_fence(void);
+
+/*
+ * Functions for reading of L2 cache configuration.
+ */
+
+/* Get raw L2 config register (CORE_CONFIG3) */
+static inline unsigned int meta_l2c_config(void)
+{
+ const unsigned int *corecfg3 = (const unsigned int *)METAC_CORE_CONFIG3;
+ return *corecfg3;
+}
+
+/* Get whether the L2 is present */
+static inline int meta_l2c_is_present(void)
+{
+ return meta_l2c_config() & METAC_CORECFG3_L2C_HAVE_L2C_BIT;
+}
+
+/* Get whether the L2 is configured for write-back instead of write-through */
+static inline int meta_l2c_is_writeback(void)
+{
+ return meta_l2c_config() & METAC_CORECFG3_L2C_MODE_BIT;
+}
+
+/* Get whether the L2 is unified instead of separated code/data */
+static inline int meta_l2c_is_unified(void)
+{
+ return meta_l2c_config() & METAC_CORECFG3_L2C_UNIFIED_BIT;
+}
+
+/* Get the L2 cache size in bytes */
+static inline unsigned int meta_l2c_size(void)
+{
+ unsigned int size_s;
+ if (!meta_l2c_is_present())
+ return 0;
+ size_s = (meta_l2c_config() & METAC_CORECFG3_L2C_SIZE_BITS)
+ >> METAC_CORECFG3_L2C_SIZE_S;
+ /* L2CSIZE is in KiB */
+ return 1024 << size_s;
+}
+
+/* Get the number of ways in the L2 cache */
+static inline unsigned int meta_l2c_ways(void)
+{
+ unsigned int ways_s;
+ if (!meta_l2c_is_present())
+ return 0;
+ ways_s = (meta_l2c_config() & METAC_CORECFG3_L2C_NUM_WAYS_BITS)
+ >> METAC_CORECFG3_L2C_NUM_WAYS_S;
+ return 0x1 << ways_s;
+}
+
+/* Get the line size of the L2 cache */
+static inline unsigned int meta_l2c_linesize(void)
+{
+ unsigned int line_size;
+ if (!meta_l2c_is_present())
+ return 0;
+ line_size = (meta_l2c_config() & METAC_CORECFG3_L2C_LINE_SIZE_BITS)
+ >> METAC_CORECFG3_L2C_LINE_SIZE_S;
+ switch (line_size) {
+ case METAC_CORECFG3_L2C_LINE_SIZE_64B:
+ return 64;
+ default:
+ return 0;
+ }
+}
+
+/* Get the revision ID of the L2 cache */
+static inline unsigned int meta_l2c_revision(void)
+{
+ return (meta_l2c_config() & METAC_CORECFG3_L2C_REV_ID_BITS)
+ >> METAC_CORECFG3_L2C_REV_ID_S;
+}
+
+
+/*
+ * Start an initialisation of the L2 cachelines and wait for completion.
+ * This should only be done in a LOCK1 or LOCK2 critical section while the L2
+ * is disabled.
+ */
+static inline void _meta_l2c_init(void)
+{
+ metag_out32(SYSC_L2C_INIT_INIT, SYSC_L2C_INIT);
+ while (metag_in32(SYSC_L2C_INIT) == SYSC_L2C_INIT_IN_PROGRESS)
+ /* do nothing */;
+}
+
+/*
+ * Start a writeback of dirty L2 cachelines and wait for completion.
+ * This should only be done in a LOCK1 or LOCK2 critical section.
+ */
+static inline void _meta_l2c_purge(void)
+{
+ metag_out32(SYSC_L2C_PURGE_PURGE, SYSC_L2C_PURGE);
+ while (metag_in32(SYSC_L2C_PURGE) == SYSC_L2C_PURGE_IN_PROGRESS)
+ /* do nothing */;
+}
+
+/* Set whether the L2 cache is enabled. */
+static inline void _meta_l2c_enable(int enabled)
+{
+ unsigned int enable;
+
+ enable = metag_in32(SYSC_L2C_ENABLE);
+ if (enabled)
+ enable |= SYSC_L2C_ENABLE_ENABLE_BIT;
+ else
+ enable &= ~SYSC_L2C_ENABLE_ENABLE_BIT;
+ metag_out32(enable, SYSC_L2C_ENABLE);
+}
+
+/* Set whether the L2 cache prefetch is enabled. */
+static inline void _meta_l2c_pf_enable(int pfenabled)
+{
+ unsigned int enable;
+
+ enable = metag_in32(SYSC_L2C_ENABLE);
+ if (pfenabled)
+ enable |= SYSC_L2C_ENABLE_PFENABLE_BIT;
+ else
+ enable &= ~SYSC_L2C_ENABLE_PFENABLE_BIT;
+ metag_out32(enable, SYSC_L2C_ENABLE);
+}
+
+/* Return whether the L2 cache is enabled */
+static inline int _meta_l2c_is_enabled(void)
+{
+ return metag_in32(SYSC_L2C_ENABLE) & SYSC_L2C_ENABLE_ENABLE_BIT;
+}
+
+/* Return whether the L2 cache prefetch is enabled */
+static inline int _meta_l2c_pf_is_enabled(void)
+{
+ return metag_in32(SYSC_L2C_ENABLE) & SYSC_L2C_ENABLE_PFENABLE_BIT;
+}
+
+
+/* Return whether the L2 cache is enabled */
+static inline int meta_l2c_is_enabled(void)
+{
+ int en;
+
+ /*
+ * There is no need to lock at the moment, as the enable bit is never
+ * intermediately changed, so we will never see an intermediate result.
+ */
+ en = _meta_l2c_is_enabled();
+
+ return en;
+}
+
+/*
+ * Ensure the L2 cache is disabled.
+ * Return whether the L2 was previously disabled.
+ */
+int meta_l2c_disable(void);
+
+/*
+ * Ensure the L2 cache is enabled.
+ * Return whether the L2 was previously enabled.
+ */
+int meta_l2c_enable(void);
+
+/* Return whether the L2 cache prefetch is enabled */
+static inline int meta_l2c_pf_is_enabled(void)
+{
+ return l2c_pfenable;
+}
+
+/*
+ * Set whether the L2 cache prefetch is enabled.
+ * Return whether the L2 prefetch was previously enabled.
+ */
+int meta_l2c_pf_enable(int pfenable);
+
+/*
+ * Flush the L2 cache.
+ * Return 1 if the L2 is disabled.
+ */
+int meta_l2c_flush(void);
+
+/*
+ * Write back all dirty cache lines in the L2 cache.
+ * Return 1 if the L2 is disabled or there isn't any writeback.
+ */
+static inline int meta_l2c_writeback(void)
+{
+ unsigned long flags;
+ int en;
+
+ /* no need to purge if it's not a writeback cache */
+ if (!meta_l2c_is_writeback())
+ return 1;
+
+ /*
+ * Purge only works if the L2 is enabled, and involves reading back to
+ * detect completion, so keep this operation atomic with other threads.
+ */
+ __global_lock1(flags);
+ en = meta_l2c_is_enabled();
+ if (likely(en)) {
+ wr_fence();
+ _meta_l2c_purge();
+ }
+ __global_unlock1(flags);
+
+ return !en;
+}
+
+#else /* CONFIG_METAG_L2C */
+
+#define meta_l2c_config() 0
+#define meta_l2c_is_present() 0
+#define meta_l2c_is_writeback() 0
+#define meta_l2c_is_unified() 0
+#define meta_l2c_size() 0
+#define meta_l2c_ways() 0
+#define meta_l2c_linesize() 0
+#define meta_l2c_revision() 0
+
+#define meta_l2c_is_enabled() 0
+#define _meta_l2c_pf_is_enabled() 0
+#define meta_l2c_pf_is_enabled() 0
+#define meta_l2c_disable() 1
+#define meta_l2c_enable() 0
+#define meta_l2c_pf_enable(X) 0
+static inline int meta_l2c_flush(void)
+{
+ return 1;
+}
+static inline int meta_l2c_writeback(void)
+{
+ return 1;
+}
+
+#endif /* CONFIG_METAG_L2C */
+
+#endif /* _METAG_L2CACHE_H */
Code Review / kvmfornfv.git / blobdiff