Some common code uses more of the io.h funcs than we currently provide, so pull in all of the ones from the linux kernel.
Signed-off-by: Mike Frysinger vapier@gentoo.org --- include/asm-blackfin/config-pre.h | 3 + include/asm-blackfin/io.h | 159 +++++++++++++++++++++++++++---------- lib_blackfin/Makefile | 2 + lib_blackfin/ins.S | 117 +++++++++++++++++++++++++++ lib_blackfin/outs.S | 60 ++++++++++++++ 5 files changed, 298 insertions(+), 43 deletions(-) create mode 100644 lib_blackfin/ins.S create mode 100644 lib_blackfin/outs.S
diff --git a/include/asm-blackfin/config-pre.h b/include/asm-blackfin/config-pre.h index b1d3a94..1170a2a 100644 --- a/include/asm-blackfin/config-pre.h +++ b/include/asm-blackfin/config-pre.h @@ -71,4 +71,7 @@ static inline const char *get_bfin_boot_mode(int bfin_boot) # define BFIN_BOOT_SPI_SSEL 1 #endif
+/* We rarely use interrupts, so favor throughput over latency */ +#define CONFIG_BFIN_INS_LOWOVERHEAD + #endif diff --git a/include/asm-blackfin/io.h b/include/asm-blackfin/io.h index 9cb07d4..75244a0 100644 --- a/include/asm-blackfin/io.h +++ b/include/asm-blackfin/io.h @@ -1,25 +1,9 @@ /* * U-boot - io.h IO routines * - * Copyright (c) 2005-2007 Analog Devices Inc. + * Copyright 2004-2009 Analog Devices Inc. * - * See file CREDITS for list of people who contributed to this - * project. - * - * 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, write to the Free Software - * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, - * MA 02110-1301 USA + * Licensed under the GPL-2 or later. */
#ifndef _BLACKFIN_IO_H @@ -29,6 +13,8 @@
#include <asm/blackfin.h>
+#define __iomem + static inline void sync(void) { SSYNC(); @@ -70,70 +56,154 @@ static inline phys_addr_t virt_to_phys(void * vaddr) * * readX/writeX() are used to access memory mapped devices. On some * architectures the memory mapped IO stuff needs to be accessed - * differently. On the m68k architecture, we just read/write the + * differently. On the bfin architecture, we just read/write the * memory location directly. */ - #ifndef __ASSEMBLY__
-static inline unsigned char readb(const volatile void *addr) +static inline unsigned char readb(const volatile void __iomem *addr) { unsigned int val; int tmp;
- __asm__ __volatile__ ("cli %1;\n\t" - "NOP; NOP; SSYNC;\n\t" - "%0 = b [%2] (z);\n\t" - "sti %1;\n\t" - : "=d"(val), "=d"(tmp): "a"(addr)); + __asm__ __volatile__ ( + "cli %1;" + "NOP; NOP; SSYNC;" + "%0 = b [%2] (z);" + "sti %1;" + : "=d"(val), "=d"(tmp) + : "a"(addr) + );
return (unsigned char) val; }
-static inline unsigned short readw(const volatile void *addr) +static inline unsigned short readw(const volatile void __iomem *addr) { unsigned int val; int tmp;
- __asm__ __volatile__ ("cli %1;\n\t" - "NOP; NOP; SSYNC;\n\t" - "%0 = w [%2] (z);\n\t" - "sti %1;\n\t" - : "=d"(val), "=d"(tmp): "a"(addr)); + __asm__ __volatile__ ( + "cli %1;" + "NOP; NOP; SSYNC;" + "%0 = w [%2] (z);" + "sti %1;" + : "=d"(val), "=d"(tmp) + : "a"(addr) + );
return (unsigned short) val; }
-static inline unsigned int readl(const volatile void *addr) +static inline unsigned int readl(const volatile void __iomem *addr) { unsigned int val; int tmp;
- __asm__ __volatile__ ("cli %1;\n\t" - "NOP; NOP; SSYNC;\n\t" - "%0 = [%2];\n\t" - "sti %1;\n\t" - : "=d"(val), "=d"(tmp): "a"(addr)); + __asm__ __volatile__ ( + "cli %1;" + "NOP; NOP; SSYNC;" + "%0 = [%2];" + "sti %1;" + : "=d"(val), "=d"(tmp) + : "a"(addr) + ); + return val; }
-#define __raw_readb readb -#define __raw_readw readw -#define __raw_readl readl - #endif /* __ASSEMBLY__ */
#define writeb(b, addr) (void)((*(volatile unsigned char *) (addr)) = (b)) #define writew(b, addr) (void)((*(volatile unsigned short *) (addr)) = (b)) #define writel(b, addr) (void)((*(volatile unsigned int *) (addr)) = (b)) + +#define __raw_readb readb +#define __raw_readw readw +#define __raw_readl readl #define __raw_writeb writeb #define __raw_writew writew #define __raw_writel writel - #define memset_io(a, b, c) memset((void *)(a), (b), (c)) #define memcpy_fromio(a, b, c) memcpy((a), (void *)(b), (c)) #define memcpy_toio(a, b, c) memcpy((void *)(a), (b), (c))
+/* Convert "I/O port addresses" to actual addresses. i.e. ugly casts. */ +#define __io(port) ((void *)(unsigned long)(port)) + +#define inb(port) readb(__io(port)) +#define inw(port) readw(__io(port)) +#define inl(port) readl(__io(port)) +#define outb(x, port) writeb(x, __io(port)) +#define outw(x, port) writew(x, __io(port)) +#define outl(x, port) writel(x, __io(port)) + +#define inb_p(port) inb(__io(port)) +#define inw_p(port) inw(__io(port)) +#define inl_p(port) inl(__io(port)) +#define outb_p(x, port) outb(x, __io(port)) +#define outw_p(x, port) outw(x, __io(port)) +#define outl_p(x, port) outl(x, __io(port)) + +#define ioread8_rep(a, d, c) readsb(a, d, c) +#define ioread16_rep(a, d, c) readsw(a, d, c) +#define ioread32_rep(a, d, c) readsl(a, d, c) +#define iowrite8_rep(a, s, c) writesb(a, s, c) +#define iowrite16_rep(a, s, c) writesw(a, s, c) +#define iowrite32_rep(a, s, c) writesl(a, s, c) + +#define ioread8(x) readb(x) +#define ioread16(x) readw(x) +#define ioread32(x) readl(x) +#define iowrite8(val, x) writeb(val, x) +#define iowrite16(val, x) writew(val, x) +#define iowrite32(val, x) writel(val, x) + +#define mmiowb() wmb() + +#ifndef __ASSEMBLY__ + +extern void outsb(unsigned long port, const void *addr, unsigned long count); +extern void outsw(unsigned long port, const void *addr, unsigned long count); +extern void outsw_8(unsigned long port, const void *addr, unsigned long count); +extern void outsl(unsigned long port, const void *addr, unsigned long count); + +extern void insb(unsigned long port, void *addr, unsigned long count); +extern void insw(unsigned long port, void *addr, unsigned long count); +extern void insw_8(unsigned long port, void *addr, unsigned long count); +extern void insl(unsigned long port, void *addr, unsigned long count); +extern void insl_16(unsigned long port, void *addr, unsigned long count); + +static inline void readsl(const void __iomem *addr, void *buf, int len) +{ + insl((unsigned long)addr, buf, len); +} + +static inline void readsw(const void __iomem *addr, void *buf, int len) +{ + insw((unsigned long)addr, buf, len); +} + +static inline void readsb(const void __iomem *addr, void *buf, int len) +{ + insb((unsigned long)addr, buf, len); +} + +static inline void writesl(const void __iomem *addr, const void *buf, int len) +{ + outsl((unsigned long)addr, buf, len); +} + +static inline void writesw(const void __iomem *addr, const void *buf, int len) +{ + outsw((unsigned long)addr, buf, len); +} + +static inline void writesb(const void __iomem *addr, const void *buf, int len) +{ + outsb((unsigned long)addr, buf, len); +} + #if defined(CONFIG_STAMP_CF) || defined(CONFIG_BFIN_IDE) /* This hack for CF/IDE needs to be addressed at some point */ extern void cf_outsw(unsigned short *addr, unsigned short *sect_buf, int words); @@ -151,4 +221,7 @@ extern void cf_outb(unsigned char val, volatile unsigned char *addr); #endif
#endif + +#endif /* __KERNEL__ */ + #endif diff --git a/lib_blackfin/Makefile b/lib_blackfin/Makefile index cbf47f0..eebb131 100644 --- a/lib_blackfin/Makefile +++ b/lib_blackfin/Makefile @@ -31,10 +31,12 @@ CFLAGS += -DBFIN_BOARD_NAME='"$(BOARD)"'
LIB = $(obj)lib$(ARCH).a
+SOBJS-y += ins.o SOBJS-y += memcmp.o SOBJS-y += memcpy.o SOBJS-y += memmove.o SOBJS-y += memset.o +SOBJS-y += outs.o
COBJS-y += board.o COBJS-y += boot.o diff --git a/lib_blackfin/ins.S b/lib_blackfin/ins.S new file mode 100644 index 0000000..4519596 --- /dev/null +++ b/lib_blackfin/ins.S @@ -0,0 +1,117 @@ +/* + * arch/blackfin/lib/ins.S - ins{bwl} using hardware loops + * + * Copyright 2004-2008 Analog Devices Inc. + * Copyright (C) 2005 Bas Vermeulen, BuyWays BV bas@buyways.nl + * Licensed under the GPL-2 or later. + */ + +#include <asm/blackfin.h> + +.align 2 + +#ifdef CONFIG_IPIPE +# define DO_CLI \ + [--sp] = rets; \ + [--sp] = (P5:0); \ + sp += -12; \ + call ___ipipe_disable_root_irqs_hw; \ + 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_enable_root_irqs_hw; \ + 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 + * external bus), and re-issued after the interrupt occurs. + * + * If a FIFO is sitting on the end of the read, it will see two reads, + * when the core only sees one. The FIFO receives the read which is cancelled, + * and not delivered to the core. + * + * To solve this, interrupts are turned off before reads occur to I/O space. + * There are 3 versions of all these functions + * - turns interrupts off every read (higher overhead, but lower latency) + * - turns interrupts off every loop (low overhead, but longer latency) + * - DMA version, which do not suffer from this issue. DMA versions have + * different name (prefixed by dma_ ), and are located in + * ../kernel/bfin_dma_5xx.c + * Using the dma related functions are recommended for transfering large + * buffers in/out of FIFOs. + */ + +#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) + +COMMON_INS(l, \ + R0 = [P0]; \ + [P1++] = R0; \ +) + +COMMON_INS(w, \ + R0 = W[P0]; \ + W[P1++] = R0; \ +) + +COMMON_INS(w_8, \ + R0 = W[P0]; \ + B[P1++] = R0; \ + R0 = R0 >> 8; \ + B[P1++] = R0; \ +) + +COMMON_INS(b, \ + R0 = B[P0]; \ + B[P1++] = R0; \ +) + +COMMON_INS(l_16, \ + R0 = [P0]; \ + W[P1++] = R0; \ + R0 = R0 >> 16; \ + W[P1++] = R0; \ +) diff --git a/lib_blackfin/outs.S b/lib_blackfin/outs.S new file mode 100644 index 0000000..90c6033 --- /dev/null +++ b/lib_blackfin/outs.S @@ -0,0 +1,60 @@ +/* + * Implementation of outs{bwl} for BlackFin processors using zero overhead loops. + * + * Copyright 2005-2009 Analog Devices Inc. + * 2005 BuyWays BV + * Bas Vermeulen bas@buyways.nl + * + * Licensed under the GPL-2. + */ + +#include <asm/linkage.h> + +.align 2 + +ENTRY(_outsl) + P0 = R0; /* P0 = port */ + P1 = R1; /* P1 = address */ + P2 = R2; /* P2 = count */ + + LSETUP( .Llong_loop_s, .Llong_loop_e) LC0 = P2; +.Llong_loop_s: R0 = [P1++]; +.Llong_loop_e: [P0] = R0; + RTS; +ENDPROC(_outsl) + +ENTRY(_outsw) + P0 = R0; /* P0 = port */ + P1 = R1; /* P1 = address */ + P2 = R2; /* P2 = count */ + + LSETUP( .Lword_loop_s, .Lword_loop_e) LC0 = P2; +.Lword_loop_s: R0 = W[P1++]; +.Lword_loop_e: W[P0] = R0; + RTS; +ENDPROC(_outsw) + +ENTRY(_outsb) + P0 = R0; /* P0 = port */ + P1 = R1; /* P1 = address */ + P2 = R2; /* P2 = count */ + + LSETUP( .Lbyte_loop_s, .Lbyte_loop_e) LC0 = P2; +.Lbyte_loop_s: R0 = B[P1++]; +.Lbyte_loop_e: B[P0] = R0; + RTS; +ENDPROC(_outsb) + +ENTRY(_outsw_8) + P0 = R0; /* P0 = port */ + P1 = R1; /* P1 = address */ + P2 = R2; /* P2 = count */ + + LSETUP( .Lword8_loop_s, .Lword8_loop_e) LC0 = P2; +.Lword8_loop_s: R1 = B[P1++]; + R0 = B[P1++]; + R0 = R0 << 8; + R0 = R0 + R1; +.Lword8_loop_e: W[P0] = R0; + RTS; +ENDPROC(_outsw_8)