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misc.c

/*
 * 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");
}

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