/* SPDX-License-Identifier: GPL-2.0-or-later */ /* * arch/arm/mach-ep93xx/include/mach/uncompress.h * * Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org> */ #include <mach/ep93xx-regs.h> #include <asm/mach-types.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) ; } #define TS72XX_WDT_CONTROL_PHYS_BASE 0x23800000 #define TS72XX_WDT_FEED_PHYS_BASE 0x23c00000 #define TS72XX_WDT_FEED_VAL 0x05 static void __maybe_unused ts72xx_watchdog_disable(void) { __raw_writeb(TS72XX_WDT_FEED_VAL, TS72XX_WDT_FEED_PHYS_BASE); __raw_writeb(0, TS72XX_WDT_CONTROL_PHYS_BASE); } static void arch_decomp_setup(void) { if (machine_is_ts72xx()) ts72xx_watchdog_disable(); ethernet_reset(); }