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