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-rw-r--r--arch/blackfin/lib/ins.S272
1 files changed, 84 insertions, 188 deletions
diff --git a/arch/blackfin/lib/ins.S b/arch/blackfin/lib/ins.S
index d60554dce87b..1863a6ba507c 100644
--- a/arch/blackfin/lib/ins.S
+++ b/arch/blackfin/lib/ins.S
@@ -1,31 +1,9 @@
/*
- * File: arch/blackfin/lib/ins.S
- * Based on:
- * Author: Bas Vermeulen <bas@buyways.nl>
+ * arch/blackfin/lib/ins.S - ins{bwl} using hardware loops
*
- * Created: Tue Mar 22 15:27:24 CEST 2005
- * Description: Implementation of ins{bwl} for BlackFin processors using zero overhead loops.
- *
- * Modified:
- * Copyright 2004-2008 Analog Devices Inc.
- * Copyright (C) 2005 Bas Vermeulen, BuyWays BV <bas@buyways.nl>
- *
- * Bugs: Enter bugs at http://blackfin.uclinux.org/
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, see the file COPYING, or write
- * to the Free Software Foundation, Inc.,
- * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ * Copyright 2004-2008 Analog Devices Inc.
+ * Copyright (C) 2005 Bas Vermeulen, BuyWays BV <bas@buyways.nl>
+ * Licensed under the GPL-2 or later.
*/
#include <linux/linkage.h>
@@ -33,6 +11,46 @@
.align 2
+#ifdef CONFIG_IPIPE
+# define DO_CLI \
+ [--sp] = rets; \
+ [--sp] = (P5:0); \
+ sp += -12; \
+ call ___ipipe_stall_root_raw; \
+ sp += 12; \
+ (P5:0) = [sp++];
+# define CLI_INNER_NOP
+#else
+# define DO_CLI cli R3;
+# define CLI_INNER_NOP nop; nop; nop;
+#endif
+
+#ifdef CONFIG_IPIPE
+# define DO_STI \
+ sp += -12; \
+ call ___ipipe_unstall_root_raw; \
+ sp += 12; \
+2: rets = [sp++];
+#else
+# define DO_STI 2: sti R3;
+#endif
+
+#ifdef CONFIG_BFIN_INS_LOWOVERHEAD
+# define CLI_OUTER DO_CLI;
+# define STI_OUTER DO_STI;
+# define CLI_INNER 1:
+# if ANOMALY_05000416
+# define STI_INNER nop; 2: nop;
+# else
+# define STI_INNER 2:
+# endif
+#else
+# define CLI_OUTER
+# define STI_OUTER
+# define CLI_INNER 1: DO_CLI; CLI_INNER_NOP;
+# define STI_INNER DO_STI;
+#endif
+
/*
* Reads on the Blackfin are speculative. In Blackfin terms, this means they
* can be interrupted at any time (even after they have been issued on to the
@@ -53,170 +71,48 @@
* buffers in/out of FIFOs.
*/
-ENTRY(_insl)
-#ifdef CONFIG_BFIN_INS_LOWOVERHEAD
- P0 = R0; /* P0 = port */
- cli R3;
- P1 = R1; /* P1 = address */
- P2 = R2; /* P2 = count */
- SSYNC;
- LSETUP( .Llong_loop_s, .Llong_loop_e) LC0 = P2;
-.Llong_loop_s: R0 = [P0];
- [P1++] = R0;
- NOP;
-.Llong_loop_e: NOP;
- sti R3;
- RTS;
-#else
- P0 = R0; /* P0 = port */
- P1 = R1; /* P1 = address */
- P2 = R2; /* P2 = count */
- SSYNC;
- LSETUP( .Llong_loop_s, .Llong_loop_e) LC0 = P2;
-.Llong_loop_s:
- CLI R3;
- NOP; NOP; NOP;
- R0 = [P0];
- [P1++] = R0;
-.Llong_loop_e:
- STI R3;
+#define COMMON_INS(func, ops) \
+ENTRY(_ins##func) \
+ P0 = R0; /* P0 = port */ \
+ CLI_OUTER; /* 3 instructions before first read access */ \
+ P1 = R1; /* P1 = address */ \
+ P2 = R2; /* P2 = count */ \
+ SSYNC; \
+ \
+ LSETUP(1f, 2f) LC0 = P2; \
+ CLI_INNER; \
+ ops; \
+ STI_INNER; \
+ \
+ STI_OUTER; \
+ RTS; \
+ENDPROC(_ins##func)
- RTS;
-#endif
-ENDPROC(_insl)
-
-ENTRY(_insw)
-#ifdef CONFIG_BFIN_INS_LOWOVERHEAD
- P0 = R0; /* P0 = port */
- cli R3;
- P1 = R1; /* P1 = address */
- P2 = R2; /* P2 = count */
- SSYNC;
- LSETUP( .Lword_loop_s, .Lword_loop_e) LC0 = P2;
-.Lword_loop_s: R0 = W[P0];
- W[P1++] = R0;
- NOP;
-.Lword_loop_e: NOP;
- sti R3;
- RTS;
-#else
- P0 = R0; /* P0 = port */
- P1 = R1; /* P1 = address */
- P2 = R2; /* P2 = count */
- SSYNC;
- LSETUP( .Lword_loop_s, .Lword_loop_e) LC0 = P2;
-.Lword_loop_s:
- CLI R3;
- NOP; NOP; NOP;
- R0 = W[P0];
- W[P1++] = R0;
-.Lword_loop_e:
- STI R3;
- RTS;
-
-#endif
-ENDPROC(_insw)
-
-ENTRY(_insw_8)
-#ifdef CONFIG_BFIN_INS_LOWOVERHEAD
- P0 = R0; /* P0 = port */
- cli R3;
- P1 = R1; /* P1 = address */
- P2 = R2; /* P2 = count */
- SSYNC;
- LSETUP( .Lword8_loop_s, .Lword8_loop_e) LC0 = P2;
-.Lword8_loop_s: R0 = W[P0];
- B[P1++] = R0;
- R0 = R0 >> 8;
- B[P1++] = R0;
- NOP;
-.Lword8_loop_e: NOP;
- sti R3;
- RTS;
-#else
- P0 = R0; /* P0 = port */
- P1 = R1; /* P1 = address */
- P2 = R2; /* P2 = count */
- SSYNC;
- LSETUP( .Lword8_loop_s, .Lword8_loop_e) LC0 = P2;
-.Lword8_loop_s:
- CLI R3;
- NOP; NOP; NOP;
- R0 = W[P0];
- B[P1++] = R0;
- R0 = R0 >> 8;
- B[P1++] = R0;
- NOP;
-.Lword8_loop_e:
- STI R3;
+COMMON_INS(l, \
+ R0 = [P0]; \
+ [P1++] = R0; \
+)
- RTS;
-#endif
-ENDPROC(_insw_8)
+COMMON_INS(w, \
+ R0 = W[P0]; \
+ W[P1++] = R0; \
+)
-ENTRY(_insb)
-#ifdef CONFIG_BFIN_INS_LOWOVERHEAD
- P0 = R0; /* P0 = port */
- cli R3;
- P1 = R1; /* P1 = address */
- P2 = R2; /* P2 = count */
- SSYNC;
- LSETUP( .Lbyte_loop_s, .Lbyte_loop_e) LC0 = P2;
-.Lbyte_loop_s: R0 = B[P0];
- B[P1++] = R0;
- NOP;
-.Lbyte_loop_e: NOP;
- sti R3;
- RTS;
-#else
- P0 = R0; /* P0 = port */
- P1 = R1; /* P1 = address */
- P2 = R2; /* P2 = count */
- SSYNC;
- LSETUP( .Lbyte_loop_s, .Lbyte_loop_e) LC0 = P2;
-.Lbyte_loop_s:
- CLI R3;
- NOP; NOP; NOP;
- R0 = B[P0];
- B[P1++] = R0;
-.Lbyte_loop_e:
- STI R3;
+COMMON_INS(w_8, \
+ R0 = W[P0]; \
+ B[P1++] = R0; \
+ R0 = R0 >> 8; \
+ B[P1++] = R0; \
+)
- RTS;
-#endif
-ENDPROC(_insb)
+COMMON_INS(b, \
+ R0 = B[P0]; \
+ B[P1++] = R0; \
+)
-ENTRY(_insl_16)
-#ifdef CONFIG_BFIN_INS_LOWOVERHEAD
- P0 = R0; /* P0 = port */
- cli R3;
- P1 = R1; /* P1 = address */
- P2 = R2; /* P2 = count */
- SSYNC;
- LSETUP( .Llong16_loop_s, .Llong16_loop_e) LC0 = P2;
-.Llong16_loop_s: R0 = [P0];
- W[P1++] = R0;
- R0 = R0 >> 16;
- W[P1++] = R0;
- NOP;
-.Llong16_loop_e: NOP;
- sti R3;
- RTS;
-#else
- P0 = R0; /* P0 = port */
- P1 = R1; /* P1 = address */
- P2 = R2; /* P2 = count */
- SSYNC;
- LSETUP( .Llong16_loop_s, .Llong16_loop_e) LC0 = P2;
-.Llong16_loop_s:
- CLI R3;
- NOP; NOP; NOP;
- R0 = [P0];
- W[P1++] = R0;
- R0 = R0 >> 16;
- W[P1++] = R0;
-.Llong16_loop_e:
- STI R3;
- RTS;
-#endif
-ENDPROC(_insl_16)
+COMMON_INS(l_16, \
+ R0 = [P0]; \
+ W[P1++] = R0; \
+ R0 = R0 >> 16; \
+ W[P1++] = R0; \
+)
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.