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author | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2015-08-05 17:04:01 -0300 |
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committer | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2015-08-05 17:04:01 -0300 |
commit | 57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch) | |
tree | 5e910f0e82173f4ef4f51111366a3f1299037a7b /arch/arm/mach-ep93xx/include/mach/uncompress.h |
Initial import
Diffstat (limited to 'arch/arm/mach-ep93xx/include/mach/uncompress.h')
-rw-r--r-- | arch/arm/mach-ep93xx/include/mach/uncompress.h | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/arch/arm/mach-ep93xx/include/mach/uncompress.h b/arch/arm/mach-ep93xx/include/mach/uncompress.h new file mode 100644 index 000000000..03c42e540 --- /dev/null +++ b/arch/arm/mach-ep93xx/include/mach/uncompress.h @@ -0,0 +1,82 @@ +/* + * arch/arm/mach-ep93xx/include/mach/uncompress.h + * + * Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.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. + */ + +#include <mach/ep93xx-regs.h> + +static unsigned char __raw_readb(unsigned int ptr) +{ + return *((volatile unsigned char *)ptr); +} + +static unsigned int __raw_readl(unsigned int ptr) +{ + return *((volatile unsigned int *)ptr); +} + +static void __raw_writeb(unsigned char value, unsigned int ptr) +{ + *((volatile unsigned char *)ptr) = value; +} + +static void __raw_writel(unsigned int value, unsigned int ptr) +{ + *((volatile unsigned int *)ptr) = value; +} + +#define PHYS_UART_DATA (CONFIG_DEBUG_UART_PHYS + 0x00) +#define PHYS_UART_FLAG (CONFIG_DEBUG_UART_PHYS + 0x18) +#define UART_FLAG_TXFF 0x20 + +static inline void putc(int c) +{ + int i; + + for (i = 0; i < 10000; i++) { + /* Transmit fifo not full? */ + if (!(__raw_readb(PHYS_UART_FLAG) & UART_FLAG_TXFF)) + break; + } + + __raw_writeb(c, PHYS_UART_DATA); +} + +static inline void flush(void) +{ +} + + +/* + * Some bootloaders don't turn off DMA from the ethernet MAC before + * jumping to linux, which means that we might end up with bits of RX + * status and packet data scribbled over the uncompressed kernel image. + * Work around this by resetting the ethernet MAC before we uncompress. + */ +#define PHYS_ETH_SELF_CTL 0x80010020 +#define ETH_SELF_CTL_RESET 0x00000001 + +static void ethernet_reset(void) +{ + unsigned int v; + + /* Reset the ethernet MAC. */ + v = __raw_readl(PHYS_ETH_SELF_CTL); + __raw_writel(v | ETH_SELF_CTL_RESET, PHYS_ETH_SELF_CTL); + + /* Wait for reset to finish. */ + while (__raw_readl(PHYS_ETH_SELF_CTL) & ETH_SELF_CTL_RESET) + ; +} + + +static void arch_decomp_setup(void) +{ + ethernet_reset(); +} |