[deliverable/linux.git] / arch / arm / plat-s3c / include / plat / uncompress.h

/* linux/include/asm-arm/plat-s3c/uncompress.h
 *
 * Copyright 2003, 2007 Simtec Electronics
 *	http://armlinux.simtec.co.uk/
 *	Ben Dooks <ben@simtec.co.uk>
 *
 * S3C - uncompress code
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
*/

#ifndef __ASM_PLAT_UNCOMPRESS_H
#define __ASM_PLAT_UNCOMPRESS_H

typedef unsigned int upf_t;	/* cannot include linux/serial_core.h */

/* uart setup */

static unsigned int fifo_mask;
static unsigned int fifo_max;

/* forward declerations */

static void arch_detect_cpu(void);

/* defines for UART registers */

#include <plat/regs-serial.h>
#include <plat/regs-watchdog.h>

/* working in physical space... */
#undef S3C2410_WDOGREG
#define S3C2410_WDOGREG(x) ((S3C24XX_PA_WATCHDOG + (x)))

/* how many bytes we allow into the FIFO at a time in FIFO mode */
#define FIFO_MAX	 (14)

#define uart_base S3C_PA_UART + (S3C_UART_OFFSET * CONFIG_S3C_LOWLEVEL_UART_PORT)

static __inline__ void
uart_wr(unsigned int reg, unsigned int val)
{
	volatile unsigned int *ptr;

	ptr = (volatile unsigned int *)(reg + uart_base);
	*ptr = val;
}

static __inline__ unsigned int
uart_rd(unsigned int reg)
{
	volatile unsigned int *ptr;

	ptr = (volatile unsigned int *)(reg + uart_base);
	return *ptr;
}

/* we can deal with the case the UARTs are being run
 * in FIFO mode, so that we don't hold up our execution
 * waiting for tx to happen...
*/

static void putc(int ch)
{
	if (uart_rd(S3C2410_UFCON) & S3C2410_UFCON_FIFOMODE) {
		int level;

		while (1) {
			level = uart_rd(S3C2410_UFSTAT);
			level &= fifo_mask;

			if (level < fifo_max)
				break;
		}

	} else {
		/* not using fifos */

		while ((uart_rd(S3C2410_UTRSTAT) & S3C2410_UTRSTAT_TXE) != S3C2410_UTRSTAT_TXE)
			barrier();
	}

	/* write byte to transmission register */
	uart_wr(S3C2410_UTXH, ch);
}

static inline void flush(void)
{
}

#define __raw_writel(d, ad)			\
	do {							\
		*((volatile unsigned int __force *)(ad)) = (d); \
	} while (0)

/* CONFIG_S3C_BOOT_WATCHDOG
 *
 * Simple boot-time watchdog setup, to reboot the system if there is
 * any problem with the boot process
*/

#ifdef CONFIG_S3C_BOOT_WATCHDOG

#define WDOG_COUNT (0xff00)

static inline void arch_decomp_wdog(void)
{
	__raw_writel(WDOG_COUNT, S3C2410_WTCNT);
}

static void arch_decomp_wdog_start(void)
{
	__raw_writel(WDOG_COUNT, S3C2410_WTDAT);
	__raw_writel(WDOG_COUNT, S3C2410_WTCNT);
	__raw_writel(S3C2410_WTCON_ENABLE | S3C2410_WTCON_DIV128 | S3C2410_WTCON_RSTEN | S3C2410_WTCON_PRESCALE(0x80), S3C2410_WTCON);
}

#else
#define arch_decomp_wdog_start()
#define arch_decomp_wdog()
#endif

#ifdef CONFIG_S3C_BOOT_ERROR_RESET

static void arch_decomp_error(const char *x)
{
	putstr("\n\n");
	putstr(x);
	putstr("\n\n -- System resetting\n");

	__raw_writel(0x4000, S3C2410_WTDAT);
	__raw_writel(0x4000, S3C2410_WTCNT);
	__raw_writel(S3C2410_WTCON_ENABLE | S3C2410_WTCON_DIV128 | S3C2410_WTCON_RSTEN | S3C2410_WTCON_PRESCALE(0x40), S3C2410_WTCON);

	while(1);
}

#define arch_error arch_decomp_error
#endif

static void error(char *err);

#ifdef CONFIG_S3C_BOOT_UART_FORCE_FIFO
static inline void arch_enable_uart_fifo(void)
{
	u32 fifocon = uart_rd(S3C2410_UFCON);

	if (!(fifocon & S3C2410_UFCON_FIFOMODE)) {
		fifocon |= S3C2410_UFCON_RESETBOTH;
		uart_wr(S3C2410_UFCON, fifocon);

		/* wait for fifo reset to complete */
		while (1) {
			fifocon = uart_rd(S3C2410_UFCON);
			if (!(fifocon & S3C2410_UFCON_RESETBOTH))
				break;
		}
	}
}
#else
#define arch_enable_uart_fifo() do { } while(0)
#endif


static void
arch_decomp_setup(void)
{
	/* we may need to setup the uart(s) here if we are not running
	 * on an BAST... the BAST will have left the uarts configured
	 * after calling linux.
	 */

	arch_detect_cpu();
	arch_decomp_wdog_start();

	/* Enable the UART FIFOs if they where not enabled and our
	 * configuration says we should turn them on.
	 */

	arch_enable_uart_fifo();
}


#endif /* __ASM_PLAT_UNCOMPRESS_H */
Commit	Line	Data
a14a26ac BD	1	/* linux/include/asm-arm/plat-s3c/uncompress.h
	2	*
	3	* Copyright 2003, 2007 Simtec Electronics
	4	* http://armlinux.simtec.co.uk/
	5	* Ben Dooks <ben@simtec.co.uk>
	6	*
	7	* S3C - uncompress code
	8	*
	9	* This program is free software; you can redistribute it and/or modify
	10	* it under the terms of the GNU General Public License version 2 as
	11	* published by the Free Software Foundation.
	12	*/
	13
	14	#ifndef __ASM_PLAT_UNCOMPRESS_H
	15	#define __ASM_PLAT_UNCOMPRESS_H
	16
	17	typedef unsigned int upf_t; /* cannot include linux/serial_core.h */
	18
	19	/* uart setup */
	20
	21	static unsigned int fifo_mask;
	22	static unsigned int fifo_max;
	23
	24	/* forward declerations */
	25
	26	static void arch_detect_cpu(void);
	27
	28	/* defines for UART registers */
	29
a2b7ba9c	30	#include <plat/regs-serial.h>
180ee700	31	#include <plat/regs-watchdog.h>
a14a26ac BD	32
	33	/* working in physical space... */
	34	#undef S3C2410_WDOGREG
	35	#define S3C2410_WDOGREG(x) ((S3C24XX_PA_WATCHDOG + (x)))
	36
	37	/* how many bytes we allow into the FIFO at a time in FIFO mode */
	38	#define FIFO_MAX (14)
	39
e1a2bd1d	40	#define uart_base S3C_PA_UART + (S3C_UART_OFFSET * CONFIG_S3C_LOWLEVEL_UART_PORT)
a14a26ac BD	41
	42	static __inline__ void
	43	uart_wr(unsigned int reg, unsigned int val)
	44	{
	45	volatile unsigned int *ptr;
	46
	47	ptr = (volatile unsigned int *)(reg + uart_base);
	48	*ptr = val;
	49	}
	50
	51	static __inline__ unsigned int
	52	uart_rd(unsigned int reg)
	53	{
	54	volatile unsigned int *ptr;
	55
	56	ptr = (volatile unsigned int *)(reg + uart_base);
	57	return *ptr;
	58	}
	59
	60	/* we can deal with the case the UARTs are being run
	61	* in FIFO mode, so that we don't hold up our execution
	62	* waiting for tx to happen...
	63	*/
	64
	65	static void putc(int ch)
	66	{
	67	if (uart_rd(S3C2410_UFCON) & S3C2410_UFCON_FIFOMODE) {
	68	int level;
	69
	70	while (1) {
	71	level = uart_rd(S3C2410_UFSTAT);
	72	level &= fifo_mask;
	73
	74	if (level < fifo_max)
	75	break;
	76	}
	77
	78	} else {
	79	/* not using fifos */
	80
	81	while ((uart_rd(S3C2410_UTRSTAT) & S3C2410_UTRSTAT_TXE) != S3C2410_UTRSTAT_TXE)
	82	barrier();
	83	}
	84
	85	/* write byte to transmission register */
	86	uart_wr(S3C2410_UTXH, ch);
	87	}
	88
	89	static inline void flush(void)
	90	{
	91	}
	92
1144d653 DS	93	#define __raw_writel(d, ad) \
	94	do { \
	95	((volatile unsigned int __force )(ad)) = (d); \
	96	} while (0)
a14a26ac	97
a45f8261	98	/* CONFIG_S3C_BOOT_WATCHDOG
a14a26ac BD	99	*
	100	* Simple boot-time watchdog setup, to reboot the system if there is
	101	* any problem with the boot process
	102	*/
	103
a45f8261	104	#ifdef CONFIG_S3C_BOOT_WATCHDOG
a14a26ac BD	105
	106	#define WDOG_COUNT (0xff00)
	107
	108	static inline void arch_decomp_wdog(void)
	109	{
	110	__raw_writel(WDOG_COUNT, S3C2410_WTCNT);
	111	}
	112
	113	static void arch_decomp_wdog_start(void)
	114	{
	115	__raw_writel(WDOG_COUNT, S3C2410_WTDAT);
	116	__raw_writel(WDOG_COUNT, S3C2410_WTCNT);
	117	__raw_writel(S3C2410_WTCON_ENABLE \| S3C2410_WTCON_DIV128 \| S3C2410_WTCON_RSTEN \| S3C2410_WTCON_PRESCALE(0x80), S3C2410_WTCON);
	118	}
	119
	120	#else
	121	#define arch_decomp_wdog_start()
	122	#define arch_decomp_wdog()
	123	#endif
	124
a45f8261	125	#ifdef CONFIG_S3C_BOOT_ERROR_RESET
a14a26ac BD	126
	127	static void arch_decomp_error(const char *x)
	128	{
	129	putstr("\n\n");
	130	putstr(x);
	131	putstr("\n\n -- System resetting\n");
	132
	133	__raw_writel(0x4000, S3C2410_WTDAT);
	134	__raw_writel(0x4000, S3C2410_WTCNT);
	135	__raw_writel(S3C2410_WTCON_ENABLE \| S3C2410_WTCON_DIV128 \| S3C2410_WTCON_RSTEN \| S3C2410_WTCON_PRESCALE(0x40), S3C2410_WTCON);
	136
	137	while(1);
	138	}
	139
	140	#define arch_error arch_decomp_error
	141	#endif
	142
	143	static void error(char *err);
	144
e7aa6f46 BD	145	#ifdef CONFIG_S3C_BOOT_UART_FORCE_FIFO
	146	static inline void arch_enable_uart_fifo(void)
	147	{
	148	u32 fifocon = uart_rd(S3C2410_UFCON);
	149
	150	if (!(fifocon & S3C2410_UFCON_FIFOMODE)) {
	151	fifocon \|= S3C2410_UFCON_RESETBOTH;
	152	uart_wr(S3C2410_UFCON, fifocon);
	153
	154	/* wait for fifo reset to complete */
	155	while (1) {
	156	fifocon = uart_rd(S3C2410_UFCON);
	157	if (!(fifocon & S3C2410_UFCON_RESETBOTH))
	158	break;
	159	}
	160	}
	161	}
	162	#else
	163	#define arch_enable_uart_fifo() do { } while(0)
	164	#endif
	165
	166
a14a26ac BD	167	static void
	168	arch_decomp_setup(void)
	169	{
	170	/* we may need to setup the uart(s) here if we are not running
	171	* on an BAST... the BAST will have left the uarts configured
	172	* after calling linux.
	173	*/
	174
	175	arch_detect_cpu();
	176	arch_decomp_wdog_start();
e7aa6f46 BD	177
	178	/* Enable the UART FIFOs if they where not enabled and our
	179	* configuration says we should turn them on.
	180	*/
	181
	182	arch_enable_uart_fifo();
a14a26ac BD	183	}
	184
	185
	186	#endif /* __ASM_PLAT_UNCOMPRESS_H */