1/* SPDX-License-Identifier: GPL-2.0-or-later */ 2/* 3 * arch/arm/mach-ep93xx/include/mach/uncompress.h 4 * 5 * Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org> 6 */ 7 8#include <mach/ep93xx-regs.h> 9#include <asm/mach-types.h> 10 11static unsigned char __raw_readb(unsigned int ptr) 12{ 13 return *((volatile unsigned char *)ptr); 14} 15 16static unsigned int __raw_readl(unsigned int ptr) 17{ 18 return *((volatile unsigned int *)ptr); 19} 20 21static void __raw_writeb(unsigned char value, unsigned int ptr) 22{ 23 *((volatile unsigned char *)ptr) = value; 24} 25 26static void __raw_writel(unsigned int value, unsigned int ptr) 27{ 28 *((volatile unsigned int *)ptr) = value; 29} 30 31#define PHYS_UART_DATA (CONFIG_DEBUG_UART_PHYS + 0x00) 32#define PHYS_UART_FLAG (CONFIG_DEBUG_UART_PHYS + 0x18) 33#define UART_FLAG_TXFF 0x20 34 35static inline void putc(int c) 36{ 37 int i; 38 39 for (i = 0; i < 10000; i++) { 40 /* Transmit fifo not full? */ 41 if (!(__raw_readb(PHYS_UART_FLAG) & UART_FLAG_TXFF)) 42 break; 43 } 44 45 __raw_writeb(c, PHYS_UART_DATA); 46} 47 48static inline void flush(void) 49{ 50} 51 52 53/* 54 * Some bootloaders don't turn off DMA from the ethernet MAC before 55 * jumping to linux, which means that we might end up with bits of RX 56 * status and packet data scribbled over the uncompressed kernel image. 57 * Work around this by resetting the ethernet MAC before we uncompress. 58 */ 59#define PHYS_ETH_SELF_CTL 0x80010020 60#define ETH_SELF_CTL_RESET 0x00000001 61 62static void ethernet_reset(void) 63{ 64 unsigned int v; 65 66 /* Reset the ethernet MAC. */ 67 v = __raw_readl(PHYS_ETH_SELF_CTL); 68 __raw_writel(v | ETH_SELF_CTL_RESET, PHYS_ETH_SELF_CTL); 69 70 /* Wait for reset to finish. */ 71 while (__raw_readl(PHYS_ETH_SELF_CTL) & ETH_SELF_CTL_RESET) 72 ; 73} 74 75#define TS72XX_WDT_CONTROL_PHYS_BASE 0x23800000 76#define TS72XX_WDT_FEED_PHYS_BASE 0x23c00000 77#define TS72XX_WDT_FEED_VAL 0x05 78 79static void __maybe_unused ts72xx_watchdog_disable(void) 80{ 81 __raw_writeb(TS72XX_WDT_FEED_VAL, TS72XX_WDT_FEED_PHYS_BASE); 82 __raw_writeb(0, TS72XX_WDT_CONTROL_PHYS_BASE); 83} 84 85static void arch_decomp_setup(void) 86{ 87 if (machine_is_ts72xx()) 88 ts72xx_watchdog_disable(); 89 ethernet_reset(); 90} 91