xref: /OK3568_Linux_fs/kernel/arch/arm/mach-ep93xx/include/mach/uncompress.h (revision 4882a59341e53eb6f0b4789bf948001014eff981) 
1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0-or-later */
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun  * arch/arm/mach-ep93xx/include/mach/uncompress.h
4*4882a593Smuzhiyun  *
5*4882a593Smuzhiyun  * Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org>
6*4882a593Smuzhiyun  */
7*4882a593Smuzhiyun 
8*4882a593Smuzhiyun #include <mach/ep93xx-regs.h>
9*4882a593Smuzhiyun #include <asm/mach-types.h>
10*4882a593Smuzhiyun 
__raw_readb(unsigned int ptr)11*4882a593Smuzhiyun static unsigned char __raw_readb(unsigned int ptr)
12*4882a593Smuzhiyun {
13*4882a593Smuzhiyun 	return *((volatile unsigned char *)ptr);
14*4882a593Smuzhiyun }
15*4882a593Smuzhiyun 
__raw_readl(unsigned int ptr)16*4882a593Smuzhiyun static unsigned int __raw_readl(unsigned int ptr)
17*4882a593Smuzhiyun {
18*4882a593Smuzhiyun 	return *((volatile unsigned int *)ptr);
19*4882a593Smuzhiyun }
20*4882a593Smuzhiyun 
__raw_writeb(unsigned char value,unsigned int ptr)21*4882a593Smuzhiyun static void __raw_writeb(unsigned char value, unsigned int ptr)
22*4882a593Smuzhiyun {
23*4882a593Smuzhiyun 	*((volatile unsigned char *)ptr) = value;
24*4882a593Smuzhiyun }
25*4882a593Smuzhiyun 
__raw_writel(unsigned int value,unsigned int ptr)26*4882a593Smuzhiyun static void __raw_writel(unsigned int value, unsigned int ptr)
27*4882a593Smuzhiyun {
28*4882a593Smuzhiyun 	*((volatile unsigned int *)ptr) = value;
29*4882a593Smuzhiyun }
30*4882a593Smuzhiyun 
31*4882a593Smuzhiyun #define PHYS_UART_DATA		(CONFIG_DEBUG_UART_PHYS + 0x00)
32*4882a593Smuzhiyun #define PHYS_UART_FLAG		(CONFIG_DEBUG_UART_PHYS + 0x18)
33*4882a593Smuzhiyun #define UART_FLAG_TXFF		0x20
34*4882a593Smuzhiyun 
putc(int c)35*4882a593Smuzhiyun static inline void putc(int c)
36*4882a593Smuzhiyun {
37*4882a593Smuzhiyun 	int i;
38*4882a593Smuzhiyun 
39*4882a593Smuzhiyun 	for (i = 0; i < 10000; i++) {
40*4882a593Smuzhiyun 		/* Transmit fifo not full? */
41*4882a593Smuzhiyun 		if (!(__raw_readb(PHYS_UART_FLAG) & UART_FLAG_TXFF))
42*4882a593Smuzhiyun 			break;
43*4882a593Smuzhiyun 	}
44*4882a593Smuzhiyun 
45*4882a593Smuzhiyun 	__raw_writeb(c, PHYS_UART_DATA);
46*4882a593Smuzhiyun }
47*4882a593Smuzhiyun 
flush(void)48*4882a593Smuzhiyun static inline void flush(void)
49*4882a593Smuzhiyun {
50*4882a593Smuzhiyun }
51*4882a593Smuzhiyun 
52*4882a593Smuzhiyun 
53*4882a593Smuzhiyun /*
54*4882a593Smuzhiyun  * Some bootloaders don't turn off DMA from the ethernet MAC before
55*4882a593Smuzhiyun  * jumping to linux, which means that we might end up with bits of RX
56*4882a593Smuzhiyun  * status and packet data scribbled over the uncompressed kernel image.
57*4882a593Smuzhiyun  * Work around this by resetting the ethernet MAC before we uncompress.
58*4882a593Smuzhiyun  */
59*4882a593Smuzhiyun #define PHYS_ETH_SELF_CTL		0x80010020
60*4882a593Smuzhiyun #define ETH_SELF_CTL_RESET		0x00000001
61*4882a593Smuzhiyun 
ethernet_reset(void)62*4882a593Smuzhiyun static void ethernet_reset(void)
63*4882a593Smuzhiyun {
64*4882a593Smuzhiyun 	unsigned int v;
65*4882a593Smuzhiyun 
66*4882a593Smuzhiyun 	/* Reset the ethernet MAC.  */
67*4882a593Smuzhiyun 	v = __raw_readl(PHYS_ETH_SELF_CTL);
68*4882a593Smuzhiyun 	__raw_writel(v | ETH_SELF_CTL_RESET, PHYS_ETH_SELF_CTL);
69*4882a593Smuzhiyun 
70*4882a593Smuzhiyun 	/* Wait for reset to finish.  */
71*4882a593Smuzhiyun 	while (__raw_readl(PHYS_ETH_SELF_CTL) & ETH_SELF_CTL_RESET)
72*4882a593Smuzhiyun 		;
73*4882a593Smuzhiyun }
74*4882a593Smuzhiyun 
75*4882a593Smuzhiyun #define TS72XX_WDT_CONTROL_PHYS_BASE	0x23800000
76*4882a593Smuzhiyun #define TS72XX_WDT_FEED_PHYS_BASE	0x23c00000
77*4882a593Smuzhiyun #define TS72XX_WDT_FEED_VAL		0x05
78*4882a593Smuzhiyun 
ts72xx_watchdog_disable(void)79*4882a593Smuzhiyun static void __maybe_unused ts72xx_watchdog_disable(void)
80*4882a593Smuzhiyun {
81*4882a593Smuzhiyun 	__raw_writeb(TS72XX_WDT_FEED_VAL, TS72XX_WDT_FEED_PHYS_BASE);
82*4882a593Smuzhiyun 	__raw_writeb(0, TS72XX_WDT_CONTROL_PHYS_BASE);
83*4882a593Smuzhiyun }
84*4882a593Smuzhiyun 
arch_decomp_setup(void)85*4882a593Smuzhiyun static void arch_decomp_setup(void)
86*4882a593Smuzhiyun {
87*4882a593Smuzhiyun 	if (machine_is_ts72xx())
88*4882a593Smuzhiyun 		ts72xx_watchdog_disable();
89*4882a593Smuzhiyun 	ethernet_reset();
90*4882a593Smuzhiyun }
91