From 849369d6c66d3054688672f97d31fceb8e8230fb Mon Sep 17 00:00:00 2001 From: root Date: Fri, 25 Dec 2015 04:40:36 +0000 Subject: initial_commit --- arch/arm/mach-ep93xx/include/mach/uncompress.h | 94 ++++++++++++++++++++++++++ 1 file changed, 94 insertions(+) create mode 100644 arch/arm/mach-ep93xx/include/mach/uncompress.h (limited to 'arch/arm/mach-ep93xx/include/mach/uncompress.h') 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 00000000..16026c2b --- /dev/null +++ b/arch/arm/mach-ep93xx/include/mach/uncompress.h @@ -0,0 +1,94 @@ +/* + * arch/arm/mach-ep93xx/include/mach/uncompress.h + * + * Copyright (C) 2006 Lennert Buytenhek + * + * 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 + +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; +} + +#if defined(CONFIG_EP93XX_EARLY_UART1) +#define UART_BASE EP93XX_UART1_PHYS_BASE +#elif defined(CONFIG_EP93XX_EARLY_UART2) +#define UART_BASE EP93XX_UART2_PHYS_BASE +#elif defined(CONFIG_EP93XX_EARLY_UART3) +#define UART_BASE EP93XX_UART3_PHYS_BASE +#else +#define UART_BASE EP93XX_UART1_PHYS_BASE +#endif + +#define PHYS_UART_DATA (UART_BASE + 0x00) +#define PHYS_UART_FLAG (UART_BASE + 0x18) +#define UART_FLAG_TXFF 0x20 + +static inline void putc(int c) +{ + int i; + + for (i = 0; i < 1000; 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(); +} + +#define arch_decomp_wdog() -- cgit v1.2.3