/*
 * misc.c
 *
 * This is a collection of several routines from gzip-1.0.3
 * adapted for Linux.
 *
 * malloc by Hannu Savolainen 1993 and Matthias Urlichs 1994
 * puts by Nick Holloway 1993, better puts by Martin Mares 1995
 * adaptation for Linux/CRIS Axis Communications AB, 1999
 *
 */

/* where the piggybacked kernel image expects itself to live.
 * it is the same address we use when we network load an uncompressed
 * image into DRAM, and it is the address the kernel is linked to live
 * at by vmlinux.lds.S
 */

#define KERNEL_LOAD_ADR 0x40004000

#include <linux/types.h>

#ifdef CONFIG_ETRAX_ARCH_V32
#include <hwregs/reg_rdwr.h>
#include <hwregs/reg_map.h>
#include <hwregs/ser_defs.h>
#include <hwregs/pinmux_defs.h>
#ifdef CONFIG_CRIS_MACH_ARTPEC3
#include <hwregs/clkgen_defs.h>
#endif
#else
#include <arch/svinto.h>
#endif

/*
 * gzip declarations
 */

#define OF(args)  args
#define STATIC static

void *memset(void *s, int c, size_t n);
void *memcpy(void *__dest, __const void *__src, size_t __n);

#define memzero(s, n)     memset((s), 0, (n))

typedef unsigned char  uch;
typedef unsigned short ush;
typedef unsigned long  ulg;

#define WSIZE 0x8000		/* Window size must be at least 32k, */
				/* and a power of two */

static uch *inbuf;	     /* input buffer */
static uch window[WSIZE];    /* Sliding window buffer */

unsigned inptr = 0;	/* index of next byte to be processed in inbuf
			 * After decompression it will contain the
			 * compressed size, and head.S will read it.
			 */

static unsigned outcnt = 0;  /* bytes in output buffer */

/* gzip flag byte */
#define ASCII_FLAG   0x01 /* bit 0 set: file probably ascii text */
#define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */
#define EXTRA_FIELD  0x04 /* bit 2 set: extra field present */
#define ORIG_NAME    0x08 /* bit 3 set: original file name present */
#define COMMENT      0x10 /* bit 4 set: file comment present */
#define ENCRYPTED    0x20 /* bit 5 set: file is encrypted */
#define RESERVED     0xC0 /* bit 6,7:   reserved */

#define get_byte() (inbuf[inptr++])

/* Diagnostic functions */
#ifdef DEBUG
#  define Assert(cond, msg) do { \
		if (!(cond)) \
			error(msg); \
	} while (0)
#  define Trace(x) fprintf x
#  define Tracev(x) do { \
		if (verbose) \
			fprintf x; \
	} while (0)
#  define Tracevv(x) do { \
		if (verbose > 1) \
			fprintf x; \
	} while (0)
#  define Tracec(c, x) do { \
		if (verbose && (c)) \
			fprintf x; \
	} while (0)
#  define Tracecv(c, x) do { \
		if (verbose > 1 && (c)) \
			fprintf x; \
	} while (0)
#else
#  define Assert(cond, msg)
#  define Trace(x)
#  define Tracev(x)
#  define Tracevv(x)
#  define Tracec(c, x)
#  define Tracecv(c, x)
#endif

static void flush_window(void);
static void error(char *m);
static void aputs(const char *s);

extern char *input_data;  /* lives in head.S */

static long bytes_out;
static uch *output_data;
static unsigned long output_ptr;

/* the "heap" is put directly after the BSS ends, at end */

extern int _end;
static long free_mem_ptr = (long)&_end;
static long free_mem_end_ptr;

#include "../../../../../lib/inflate.c"

/* decompressor info and error messages to serial console */

#ifdef CONFIG_ETRAX_ARCH_V32
static inline void serout(const char *s, reg_scope_instances regi_ser)
{
	reg_ser_rs_stat_din rs;
	reg_ser_rw_dout dout = {.data = *s};

	do {
		rs = REG_RD(ser, regi_ser, rs_stat_din);
	}
	while (!rs.tr_rdy);/* Wait for transceiver. */

	REG_WR(ser, regi_ser, rw_dout, dout);
}
#define SEROUT(S, N) \
	do { \
		serout(S, regi_ser ## N); \
		s++; \
	} while (0)
#else
#define SEROUT(S, N) do { \
		while (!(*R_SERIAL ## N ## _STATUS & (1 << 5))) \
			; \
		*R_SERIAL ## N ## _TR_DATA = *s++; \
	} while (0)
#endif

static void aputs(const char *s)
{
#ifndef CONFIG_ETRAX_DEBUG_PORT_NULL
	while (*s) {
#ifdef CONFIG_ETRAX_DEBUG_PORT0
		SEROUT(s, 0);
#endif
#ifdef CONFIG_ETRAX_DEBUG_PORT1
		SEROUT(s, 1);
#endif
#ifdef CONFIG_ETRAX_DEBUG_PORT2
		SEROUT(s, 2);
#endif
#ifdef CONFIG_ETRAX_DEBUG_PORT3
		SEROUT(s, 3);
#endif
	}
#endif /* CONFIG_ETRAX_DEBUG_PORT_NULL */
}

void *memset(void *s, int c, size_t n)
{
	int i;
	char *ss = (char*)s;

	for (i=0;i<n;i++) ss[i] = c;

	return s;
}

void *memcpy(void *__dest, __const void *__src, size_t __n)
{
	int i;
	char *d = (char *)__dest, *s = (char *)__src;

	for (i = 0; i < __n; i++)
		d[i] = s[i];

	return __dest;
}

/* ===========================================================================
 * Write the output window window[0..outcnt-1] and update crc and bytes_out.
 * (Used for the decompressed data only.)
 */

static void flush_window(void)
{
	ulg c = crc;         /* temporary variable */
	unsigned n;
	uch *in, *out, ch;

	in = window;
	out = &output_data[output_ptr];
	for (n = 0; n < outcnt; n++) {
		ch = *out = *in;
		out++;
		in++;
		c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8);
	}
	crc = c;
	bytes_out += (ulg)outcnt;
	output_ptr += (ulg)outcnt;
	outcnt = 0;
}

static void error(char *x)
{
	aputs("\n\n");
	aputs(x);
	aputs("\n\n -- System halted\n");

	while(1);	/* Halt */
}

void setup_normal_output_buffer(void)
{
	output_data = (char *)KERNEL_LOAD_ADR;
}

#ifdef CONFIG_ETRAX_ARCH_V32
static inline void serial_setup(reg_scope_instances regi_ser)
{
	reg_ser_rw_xoff xoff;
	reg_ser_rw_tr_ctrl tr_ctrl;
	reg_ser_rw_rec_ctrl rec_ctrl;
	reg_ser_rw_tr_baud_div tr_baud;
	reg_ser_rw_rec_baud_div rec_baud;

	/* Turn off XOFF. */
	xoff = REG_RD(ser, regi_ser, rw_xoff);

	xoff.chr = 0;
	xoff.automatic = regk_ser_no;

	REG_WR(ser, regi_ser, rw_xoff, xoff);

	/* Set baudrate and stopbits. */
	tr_ctrl = REG_RD(ser, regi_ser, rw_tr_ctrl);
	rec_ctrl = REG_RD(ser, regi_ser, rw_rec_ctrl);
	tr_baud = REG_RD(ser, regi_ser, rw_tr_baud_div);
	rec_baud = REG_RD(ser, regi_ser, rw_rec_baud_div);

	tr_ctrl.stop_bits = 1;	/* 2 stop bits. */
	tr_ctrl.en = 1; /* enable transmitter */
	rec_ctrl.en = 1; /* enabler receiver */

	/*
	 * The baudrate setup used to be a bit fishy, but now transmitter and
	 * receiver are both set to the intended baud rate, 115200.
	 * The magic value is 29.493 MHz.
	 */
	tr_ctrl.base_freq = regk_ser_f29_493;
	rec_ctrl.base_freq = regk_ser_f29_493;
	tr_baud.div = (29493000 / 8) / 115200;
	rec_baud.div = (29493000 / 8) / 115200;

	REG_WR(ser, regi_ser, rw_tr_ctrl, tr_ctrl);
	REG_WR(ser, regi_ser, rw_tr_baud_div, tr_baud);
	REG_WR(ser, regi_ser, rw_rec_ctrl, rec_ctrl);
	REG_WR(ser, regi_ser, rw_rec_baud_div, rec_baud);
}
#endif

void decompress_kernel(void)
{
	char revision;
	char compile_rev;

#ifdef CONFIG_ETRAX_ARCH_V32
	/* Need at least a CRISv32 to run. */
	compile_rev = 32;
#if defined(CONFIG_ETRAX_DEBUG_PORT1) || \
    defined(CONFIG_ETRAX_DEBUG_PORT2) || \
    defined(CONFIG_ETRAX_DEBUG_PORT3)
	reg_pinmux_rw_hwprot hwprot;

#ifdef CONFIG_CRIS_MACH_ARTPEC3
	reg_clkgen_rw_clk_ctrl clk_ctrl;

	/* Enable corresponding clock region when serial 1..3 selected */

	clk_ctrl = REG_RD(clkgen, regi_clkgen, rw_clk_ctrl);
	clk_ctrl.sser_ser_dma6_7 = regk_clkgen_yes;
	REG_WR(clkgen, regi_clkgen, rw_clk_ctrl, clk_ctrl);
#endif

	/* pinmux setup for ports 1..3 */
	hwprot = REG_RD(pinmux, regi_pinmux, rw_hwprot);
#endif


#ifdef CONFIG_ETRAX_DEBUG_PORT0
	serial_setup(regi_ser0);
#endif
#ifdef CONFIG_ETRAX_DEBUG_PORT1
	hwprot.ser1 = regk_pinmux_yes;
	serial_setup(regi_ser1);
#endif
#ifdef CONFIG_ETRAX_DEBUG_PORT2
	hwprot.ser2 = regk_pinmux_yes;
	serial_setup(regi_ser2);
#endif
#ifdef CONFIG_ETRAX_DEBUG_PORT3
	hwprot.ser3 = regk_pinmux_yes;
	serial_setup(regi_ser3);
#endif
#if defined(CONFIG_ETRAX_DEBUG_PORT1) || \
    defined(CONFIG_ETRAX_DEBUG_PORT2) || \
    defined(CONFIG_ETRAX_DEBUG_PORT3)
	REG_WR(pinmux, regi_pinmux, rw_hwprot, hwprot);
#endif

	/* input_data is set in head.S */
	inbuf = input_data;
#else /* CRISv10 */
	/* Need at least a crisv10 to run. */
	compile_rev = 10;

	/* input_data is set in head.S */
	inbuf = input_data;

#ifdef CONFIG_ETRAX_DEBUG_PORT0
	*R_SERIAL0_XOFF = 0;
	*R_SERIAL0_BAUD = 0x99;
	*R_SERIAL0_TR_CTRL = 0x40;
#endif
#ifdef CONFIG_ETRAX_DEBUG_PORT1
	*R_SERIAL1_XOFF = 0;
	*R_SERIAL1_BAUD = 0x99;
	*R_SERIAL1_TR_CTRL = 0x40;
#endif
#ifdef CONFIG_ETRAX_DEBUG_PORT2
	*R_GEN_CONFIG = 0x08;
	*R_SERIAL2_XOFF = 0;
	*R_SERIAL2_BAUD = 0x99;
	*R_SERIAL2_TR_CTRL = 0x40;
#endif
#ifdef CONFIG_ETRAX_DEBUG_PORT3
	*R_GEN_CONFIG = 0x100;
	*R_SERIAL3_XOFF = 0;
	*R_SERIAL3_BAUD = 0x99;
	*R_SERIAL3_TR_CTRL = 0x40;
#endif
#endif

	setup_normal_output_buffer();

	makecrc();

	__asm__ volatile ("move $vr,%0" : "=rm" (revision));
	if (revision < compile_rev) {
#ifdef CONFIG_ETRAX_ARCH_V32
		aputs("You need at least ETRAX FS to run Linux 2.6/crisv32\n");
#else
		aputs("You need an ETRAX 100LX to run linux 2.6/crisv10\n");
#endif
		while(1);
	}

	aputs("Uncompressing Linux...\n");
	gunzip();
	aputs("Done. Now booting the kernel\n");
}