aboutsummaryrefslogtreecommitdiffstats
path: root/arch/mn10300/mm/cache-inv-by-reg.S
diff options
context:
space:
mode:
Diffstat (limited to 'arch/mn10300/mm/cache-inv-by-reg.S')
-rw-r--r--arch/mn10300/mm/cache-inv-by-reg.S356
1 files changed, 356 insertions, 0 deletions
diff --git a/arch/mn10300/mm/cache-inv-by-reg.S b/arch/mn10300/mm/cache-inv-by-reg.S
new file mode 100644
index 00000000000..c8950861ed7
--- /dev/null
+++ b/arch/mn10300/mm/cache-inv-by-reg.S
@@ -0,0 +1,356 @@
+/* MN10300 CPU cache invalidation routines, using automatic purge registers
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public Licence
+ * as published by the Free Software Foundation; either version
+ * 2 of the Licence, or (at your option) any later version.
+ */
+#include <linux/sys.h>
+#include <linux/linkage.h>
+#include <asm/smp.h>
+#include <asm/page.h>
+#include <asm/cache.h>
+#include <asm/irqflags.h>
+#include <asm/cacheflush.h>
+
+#define mn10300_local_dcache_inv_range_intr_interval \
+ +((1 << MN10300_DCACHE_INV_RANGE_INTR_LOG2_INTERVAL) - 1)
+
+#if mn10300_local_dcache_inv_range_intr_interval > 0xff
+#error MN10300_DCACHE_INV_RANGE_INTR_LOG2_INTERVAL must be 8 or less
+#endif
+
+ .am33_2
+
+#ifndef CONFIG_SMP
+ .globl mn10300_icache_inv
+ .globl mn10300_icache_inv_page
+ .globl mn10300_icache_inv_range
+ .globl mn10300_icache_inv_range2
+ .globl mn10300_dcache_inv
+ .globl mn10300_dcache_inv_page
+ .globl mn10300_dcache_inv_range
+ .globl mn10300_dcache_inv_range2
+
+mn10300_icache_inv = mn10300_local_icache_inv
+mn10300_icache_inv_page = mn10300_local_icache_inv_page
+mn10300_icache_inv_range = mn10300_local_icache_inv_range
+mn10300_icache_inv_range2 = mn10300_local_icache_inv_range2
+mn10300_dcache_inv = mn10300_local_dcache_inv
+mn10300_dcache_inv_page = mn10300_local_dcache_inv_page
+mn10300_dcache_inv_range = mn10300_local_dcache_inv_range
+mn10300_dcache_inv_range2 = mn10300_local_dcache_inv_range2
+
+#endif /* !CONFIG_SMP */
+
+###############################################################################
+#
+# void mn10300_local_icache_inv(void)
+# Invalidate the entire icache
+#
+###############################################################################
+ ALIGN
+ .globl mn10300_local_icache_inv
+ .type mn10300_local_icache_inv,@function
+mn10300_local_icache_inv:
+ mov CHCTR,a0
+
+ movhu (a0),d0
+ btst CHCTR_ICEN,d0
+ beq mn10300_local_icache_inv_end
+
+ # invalidate
+ or CHCTR_ICINV,d0
+ movhu d0,(a0)
+ movhu (a0),d0
+
+mn10300_local_icache_inv_end:
+ ret [],0
+ .size mn10300_local_icache_inv,.-mn10300_local_icache_inv
+
+###############################################################################
+#
+# void mn10300_local_dcache_inv(void)
+# Invalidate the entire dcache
+#
+###############################################################################
+ ALIGN
+ .globl mn10300_local_dcache_inv
+ .type mn10300_local_dcache_inv,@function
+mn10300_local_dcache_inv:
+ mov CHCTR,a0
+
+ movhu (a0),d0
+ btst CHCTR_DCEN,d0
+ beq mn10300_local_dcache_inv_end
+
+ # invalidate
+ or CHCTR_DCINV,d0
+ movhu d0,(a0)
+ movhu (a0),d0
+
+mn10300_local_dcache_inv_end:
+ ret [],0
+ .size mn10300_local_dcache_inv,.-mn10300_local_dcache_inv
+
+###############################################################################
+#
+# void mn10300_local_dcache_inv_range(unsigned long start, unsigned long end)
+# void mn10300_local_dcache_inv_range2(unsigned long start, unsigned long size)
+# void mn10300_local_dcache_inv_page(unsigned long start)
+# Invalidate a range of addresses on a page in the dcache
+#
+###############################################################################
+ ALIGN
+ .globl mn10300_local_dcache_inv_page
+ .globl mn10300_local_dcache_inv_range
+ .globl mn10300_local_dcache_inv_range2
+ .type mn10300_local_dcache_inv_page,@function
+ .type mn10300_local_dcache_inv_range,@function
+ .type mn10300_local_dcache_inv_range2,@function
+mn10300_local_dcache_inv_page:
+ and ~(PAGE_SIZE-1),d0
+ mov PAGE_SIZE,d1
+mn10300_local_dcache_inv_range2:
+ add d0,d1
+mn10300_local_dcache_inv_range:
+ # If we are in writeback mode we check the start and end alignments,
+ # and if they're not cacheline-aligned, we must flush any bits outside
+ # the range that share cachelines with stuff inside the range
+#ifdef CONFIG_MN10300_CACHE_WBACK
+ btst ~(L1_CACHE_BYTES-1),d0
+ bne 1f
+ btst ~(L1_CACHE_BYTES-1),d1
+ beq 2f
+1:
+ bra mn10300_local_dcache_flush_inv_range
+2:
+#endif /* CONFIG_MN10300_CACHE_WBACK */
+
+ movm [d2,d3,a2],(sp)
+
+ mov CHCTR,a0
+ movhu (a0),d2
+ btst CHCTR_DCEN,d2
+ beq mn10300_local_dcache_inv_range_end
+
+ # round the addresses out to be full cachelines, unless we're in
+ # writeback mode, in which case we would be in flush and invalidate by
+ # now
+#ifndef CONFIG_MN10300_CACHE_WBACK
+ and L1_CACHE_TAG_ADDRESS|L1_CACHE_TAG_ENTRY,d0 # round start
+ # addr down
+
+ mov L1_CACHE_BYTES-1,d2
+ add d2,d1
+ and L1_CACHE_TAG_ADDRESS|L1_CACHE_TAG_ENTRY,d1 # round end addr up
+#endif /* !CONFIG_MN10300_CACHE_WBACK */
+
+ sub d0,d1,d2 # calculate the total size
+ mov d0,a2 # A2 = start address
+ mov d1,a1 # A1 = end address
+
+ LOCAL_CLI_SAVE(d3)
+
+ mov DCPGCR,a0 # make sure the purger isn't busy
+ setlb
+ mov (a0),d0
+ btst DCPGCR_DCPGBSY,d0
+ lne
+
+ # skip initial address alignment calculation if address is zero
+ mov d2,d1
+ cmp 0,a2
+ beq 1f
+
+dcivloop:
+ /* calculate alignsize
+ *
+ * alignsize = L1_CACHE_BYTES;
+ * while (! start & alignsize) {
+ * alignsize <<=1;
+ * }
+ * d1 = alignsize;
+ */
+ mov L1_CACHE_BYTES,d1
+ lsr 1,d1
+ setlb
+ add d1,d1
+ mov d1,d0
+ and a2,d0
+ leq
+
+1:
+ /* calculate invsize
+ *
+ * if (totalsize > alignsize) {
+ * invsize = alignsize;
+ * } else {
+ * invsize = totalsize;
+ * tmp = 0x80000000;
+ * while (! invsize & tmp) {
+ * tmp >>= 1;
+ * }
+ * invsize = tmp;
+ * }
+ * d1 = invsize
+ */
+ cmp d2,d1
+ bns 2f
+ mov d2,d1
+
+ mov 0x80000000,d0 # start from 31bit=1
+ setlb
+ lsr 1,d0
+ mov d0,e0
+ and d1,e0
+ leq
+ mov d0,d1
+
+2:
+ /* set mask
+ *
+ * mask = ~(invsize-1);
+ * DCPGMR = mask;
+ */
+ mov d1,d0
+ add -1,d0
+ not d0
+ mov d0,(DCPGMR)
+
+ # invalidate area
+ mov a2,d0
+ or DCPGCR_DCI,d0
+ mov d0,(a0) # DCPGCR = (mask & start) | DCPGCR_DCI
+
+ setlb # wait for the purge to complete
+ mov (a0),d0
+ btst DCPGCR_DCPGBSY,d0
+ lne
+
+ sub d1,d2 # decrease size remaining
+ add d1,a2 # increase next start address
+
+ /* check invalidating of end address
+ *
+ * a2 = a2 + invsize
+ * if (a2 < end) {
+ * goto dcivloop;
+ * } */
+ cmp a1,a2
+ bns dcivloop
+
+ LOCAL_IRQ_RESTORE(d3)
+
+mn10300_local_dcache_inv_range_end:
+ ret [d2,d3,a2],12
+ .size mn10300_local_dcache_inv_page,.-mn10300_local_dcache_inv_page
+ .size mn10300_local_dcache_inv_range,.-mn10300_local_dcache_inv_range
+ .size mn10300_local_dcache_inv_range2,.-mn10300_local_dcache_inv_range2
+
+###############################################################################
+#
+# void mn10300_local_icache_inv_page(unsigned long start)
+# void mn10300_local_icache_inv_range2(unsigned long start, unsigned long size)
+# void mn10300_local_icache_inv_range(unsigned long start, unsigned long end)
+# Invalidate a range of addresses on a page in the icache
+#
+###############################################################################
+ ALIGN
+ .globl mn10300_local_icache_inv_page
+ .globl mn10300_local_icache_inv_range
+ .globl mn10300_local_icache_inv_range2
+ .type mn10300_local_icache_inv_page,@function
+ .type mn10300_local_icache_inv_range,@function
+ .type mn10300_local_icache_inv_range2,@function
+mn10300_local_icache_inv_page:
+ and ~(PAGE_SIZE-1),d0
+ mov PAGE_SIZE,d1
+mn10300_local_icache_inv_range2:
+ add d0,d1
+mn10300_local_icache_inv_range:
+ movm [d2,d3,a2],(sp)
+
+ mov CHCTR,a0
+ movhu (a0),d2
+ btst CHCTR_ICEN,d2
+ beq mn10300_local_icache_inv_range_reg_end
+
+ /* calculate alignsize
+ *
+ * alignsize = L1_CACHE_BYTES;
+ * for (i = (end - start - 1) / L1_CACHE_BYTES ; i > 0; i >>= 1) {
+ * alignsize <<= 1;
+ * }
+ * d2 = alignsize;
+ */
+ mov L1_CACHE_BYTES,d2
+ sub d0,d1,d3
+ add -1,d3
+ lsr L1_CACHE_SHIFT,d3
+ beq 2f
+1:
+ add d2,d2
+ lsr 1,d3
+ bne 1b
+2:
+
+ /* a1 = end */
+ mov d1,a1
+
+ LOCAL_CLI_SAVE(d3)
+
+ mov ICIVCR,a0
+ /* wait for busy bit of area invalidation */
+ setlb
+ mov (a0),d1
+ btst ICIVCR_ICIVBSY,d1
+ lne
+
+ /* set mask
+ *
+ * mask = ~(alignsize-1);
+ * ICIVMR = mask;
+ */
+ mov d2,d1
+ add -1,d1
+ not d1
+ mov d1,(ICIVMR)
+ /* a2 = mask & start */
+ and d1,d0,a2
+
+icivloop:
+ /* area invalidate
+ *
+ * ICIVCR = (mask & start) | ICIVCR_ICI
+ */
+ mov a2,d0
+ or ICIVCR_ICI,d0
+ mov d0,(a0)
+
+ /* wait for busy bit of area invalidation */
+ setlb
+ mov (a0),d1
+ btst ICIVCR_ICIVBSY,d1
+ lne
+
+ /* check invalidating of end address
+ *
+ * a2 = a2 + alignsize
+ * if (a2 < end) {
+ * goto icivloop;
+ * } */
+ add d2,a2
+ cmp a1,a2
+ bns icivloop
+
+ LOCAL_IRQ_RESTORE(d3)
+
+mn10300_local_icache_inv_range_reg_end:
+ ret [d2,d3,a2],12
+ .size mn10300_local_icache_inv_page,.-mn10300_local_icache_inv_page
+ .size mn10300_local_icache_inv_range,.-mn10300_local_icache_inv_range
+ .size mn10300_local_icache_inv_range2,.-mn10300_local_icache_inv_range2