1 /*
2 * misc.c
3 *
4 * This is a collection of several routines from gzip-1.0.3
5 * adapted for Linux.
6 *
7 * malloc by Hannu Savolainen 1993 and Matthias Urlichs 1994
8 * puts by Nick Holloway 1993, better puts by Martin Mares 1995
9 * adaptation for Linux/CRIS Axis Communications AB, 1999
10 *
11 */
12
13 /* where the piggybacked kernel image expects itself to live.
14 * it is the same address we use when we network load an uncompressed
15 * image into DRAM, and it is the address the kernel is linked to live
16 * at by vmlinux.lds.S
17 */
18
19 #define KERNEL_LOAD_ADR 0x40004000
20
21
22 #include <linux/types.h>
23 #include <hwregs/reg_rdwr.h>
24 #include <hwregs/reg_map.h>
25 #include <hwregs/ser_defs.h>
26 #include <hwregs/pinmux_defs.h>
27 #ifdef CONFIG_CRIS_MACH_ARTPEC3
28 #include <hwregs/clkgen_defs.h>
29 #endif
30
31 /*
32 * gzip declarations
33 */
34
35 #define OF(args) args
36 #define STATIC static
37
38 void* memset(void* s, int c, size_t n);
39 void* memcpy(void* __dest, __const void* __src,
40 size_t __n);
41
42 #define memzero(s, n) memset ((s), 0, (n))
43
44
45 typedef unsigned char uch;
46 typedef unsigned short ush;
47 typedef unsigned long ulg;
48
49 #define WSIZE 0x8000 /* Window size must be at least 32k, */
50 /* and a power of two */
51
52 static uch *inbuf; /* input buffer */
53 static uch window[WSIZE]; /* Sliding window buffer */
54
55 unsigned inptr = 0; /* index of next byte to be processed in inbuf
56 * After decompression it will contain the
57 * compressed size, and head.S will read it.
58 */
59
60 static unsigned outcnt = 0; /* bytes in output buffer */
61
62 /* gzip flag byte */
63 #define ASCII_FLAG 0x01 /* bit 0 set: file probably ascii text */
64 #define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */
65 #define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */
66 #define ORIG_NAME 0x08 /* bit 3 set: original file name present */
67 #define COMMENT 0x10 /* bit 4 set: file comment present */
68 #define ENCRYPTED 0x20 /* bit 5 set: file is encrypted */
69 #define RESERVED 0xC0 /* bit 6,7: reserved */
70
71 #define get_byte() inbuf[inptr++]
72
73 /* Diagnostic functions */
74 #ifdef DEBUG
75 # define Assert(cond,msg) {if(!(cond)) error(msg);}
76 # define Trace(x) fprintf x
77 # define Tracev(x) {if (verbose) fprintf x ;}
78 # define Tracevv(x) {if (verbose>1) fprintf x ;}
79 # define Tracec(c,x) {if (verbose && (c)) fprintf x ;}
80 # define Tracecv(c,x) {if (verbose>1 && (c)) fprintf x ;}
81 #else
82 # define Assert(cond,msg)
83 # define Trace(x)
84 # define Tracev(x)
85 # define Tracevv(x)
86 # define Tracec(c,x)
87 # define Tracecv(c,x)
88 #endif
89
90 static void flush_window(void);
91 static void error(char *m);
92
93 extern char *input_data; /* lives in head.S */
94
95 static long bytes_out;
96 static uch *output_data;
97 static unsigned long output_ptr;
98
99 static void error(char *m);
100
101 static void puts(const char *);
102
103 /* the "heap" is put directly after the BSS ends, at end */
104
105 extern int _end;
106 static long free_mem_ptr = (long)&_end;
107 static long free_mem_end_ptr;
108
109 #include "../../../../../lib/inflate.c"
110
111 /* decompressor info and error messages to serial console */
112
113 static inline void
serout(const char * s,reg_scope_instances regi_ser)114 serout(const char *s, reg_scope_instances regi_ser)
115 {
116 reg_ser_rs_stat_din rs;
117 reg_ser_rw_dout dout = {.data = *s};
118
119 do {
120 rs = REG_RD(ser, regi_ser, rs_stat_din);
121 }
122 while (!rs.tr_rdy);/* Wait for transceiver. */
123
124 REG_WR(ser, regi_ser, rw_dout, dout);
125 }
126
127 static void
puts(const char * s)128 puts(const char *s)
129 {
130 #ifndef CONFIG_ETRAX_DEBUG_PORT_NULL
131 while (*s) {
132 #ifdef CONFIG_ETRAX_DEBUG_PORT0
133 serout(s, regi_ser0);
134 #endif
135 #ifdef CONFIG_ETRAX_DEBUG_PORT1
136 serout(s, regi_ser1);
137 #endif
138 #ifdef CONFIG_ETRAX_DEBUG_PORT2
139 serout(s, regi_ser2);
140 #endif
141 #ifdef CONFIG_ETRAX_DEBUG_PORT3
142 serout(s, regi_ser3);
143 #endif
144 *s++;
145 }
146 /* CONFIG_ETRAX_DEBUG_PORT_NULL */
147 #endif
148 }
149
150 void*
memset(void * s,int c,size_t n)151 memset(void* s, int c, size_t n)
152 {
153 int i;
154 char *ss = (char*)s;
155
156 for (i=0;i<n;i++) ss[i] = c;
157
158 return s;
159 }
160
161 void*
memcpy(void * __dest,__const void * __src,size_t __n)162 memcpy(void* __dest, __const void* __src,
163 size_t __n)
164 {
165 int i;
166 char *d = (char *)__dest, *s = (char *)__src;
167
168 for (i=0;i<__n;i++) d[i] = s[i];
169
170 return __dest;
171 }
172
173 /* ===========================================================================
174 * Write the output window window[0..outcnt-1] and update crc and bytes_out.
175 * (Used for the decompressed data only.)
176 */
177
178 static void
flush_window()179 flush_window()
180 {
181 ulg c = crc; /* temporary variable */
182 unsigned n;
183 uch *in, *out, ch;
184
185 in = window;
186 out = &output_data[output_ptr];
187 for (n = 0; n < outcnt; n++) {
188 ch = *out++ = *in++;
189 c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8);
190 }
191 crc = c;
192 bytes_out += (ulg)outcnt;
193 output_ptr += (ulg)outcnt;
194 outcnt = 0;
195 }
196
197 static void
error(char * x)198 error(char *x)
199 {
200 puts("\r\n\n");
201 puts(x);
202 puts("\r\n\n -- System halted\n");
203
204 while(1); /* Halt */
205 }
206
207 void
setup_normal_output_buffer(void)208 setup_normal_output_buffer(void)
209 {
210 output_data = (char *)KERNEL_LOAD_ADR;
211 }
212
213 static inline void
serial_setup(reg_scope_instances regi_ser)214 serial_setup(reg_scope_instances regi_ser)
215 {
216 reg_ser_rw_xoff xoff;
217 reg_ser_rw_tr_ctrl tr_ctrl;
218 reg_ser_rw_rec_ctrl rec_ctrl;
219 reg_ser_rw_tr_baud_div tr_baud;
220 reg_ser_rw_rec_baud_div rec_baud;
221
222 /* Turn off XOFF. */
223 xoff = REG_RD(ser, regi_ser, rw_xoff);
224
225 xoff.chr = 0;
226 xoff.automatic = regk_ser_no;
227
228 REG_WR(ser, regi_ser, rw_xoff, xoff);
229
230 /* Set baudrate and stopbits. */
231 tr_ctrl = REG_RD(ser, regi_ser, rw_tr_ctrl);
232 rec_ctrl = REG_RD(ser, regi_ser, rw_rec_ctrl);
233 tr_baud = REG_RD(ser, regi_ser, rw_tr_baud_div);
234 rec_baud = REG_RD(ser, regi_ser, rw_rec_baud_div);
235
236 tr_ctrl.stop_bits = 1; /* 2 stop bits. */
237 tr_ctrl.en = 1; /* enable transmitter */
238 rec_ctrl.en = 1; /* enabler receiver */
239
240 /*
241 * The baudrate setup used to be a bit fishy, but now transmitter and
242 * receiver are both set to the intended baud rate, 115200.
243 * The magic value is 29.493 MHz.
244 */
245 tr_ctrl.base_freq = regk_ser_f29_493;
246 rec_ctrl.base_freq = regk_ser_f29_493;
247 tr_baud.div = (29493000 / 8) / 115200;
248 rec_baud.div = (29493000 / 8) / 115200;
249
250 REG_WR(ser, regi_ser, rw_tr_ctrl, tr_ctrl);
251 REG_WR(ser, regi_ser, rw_tr_baud_div, tr_baud);
252 REG_WR(ser, regi_ser, rw_rec_ctrl, rec_ctrl);
253 REG_WR(ser, regi_ser, rw_rec_baud_div, rec_baud);
254 }
255
256 void
decompress_kernel(void)257 decompress_kernel(void)
258 {
259 char revision;
260
261 #if defined(CONFIG_ETRAX_DEBUG_PORT1) || \
262 defined(CONFIG_ETRAX_DEBUG_PORT2) || \
263 defined(CONFIG_ETRAX_DEBUG_PORT3)
264 reg_pinmux_rw_hwprot hwprot;
265
266 #ifdef CONFIG_CRIS_MACH_ARTPEC3
267 reg_clkgen_rw_clk_ctrl clk_ctrl;
268
269 /* Enable corresponding clock region when serial 1..3 selected */
270
271 clk_ctrl = REG_RD(clkgen, regi_clkgen, rw_clk_ctrl);
272 clk_ctrl.sser_ser_dma6_7 = regk_clkgen_yes;
273 REG_WR(clkgen, regi_clkgen, rw_clk_ctrl, clk_ctrl);
274 #endif
275
276 /* pinmux setup for ports 1..3 */
277 hwprot = REG_RD(pinmux, regi_pinmux, rw_hwprot);
278 #endif
279
280 #ifdef CONFIG_ETRAX_DEBUG_PORT0
281 serial_setup(regi_ser0);
282 #endif
283 #ifdef CONFIG_ETRAX_DEBUG_PORT1
284 hwprot.ser1 = regk_pinmux_yes;
285 serial_setup(regi_ser1);
286 #endif
287 #ifdef CONFIG_ETRAX_DEBUG_PORT2
288 hwprot.ser2 = regk_pinmux_yes;
289 serial_setup(regi_ser2);
290 #endif
291 #ifdef CONFIG_ETRAX_DEBUG_PORT3
292 hwprot.ser3 = regk_pinmux_yes;
293 serial_setup(regi_ser3);
294 #endif
295 #if defined(CONFIG_ETRAX_DEBUG_PORT1) || \
296 defined(CONFIG_ETRAX_DEBUG_PORT2) || \
297 defined(CONFIG_ETRAX_DEBUG_PORT3)
298 REG_WR(pinmux, regi_pinmux, rw_hwprot, hwprot);
299 #endif
300
301 /* input_data is set in head.S */
302 inbuf = input_data;
303
304 setup_normal_output_buffer();
305
306 makecrc();
307
308 __asm__ volatile ("move $vr,%0" : "=rm" (revision));
309 if (revision < 32)
310 {
311 puts("You need an ETRAX FS to run Linux 2.6/crisv32.\r\n");
312 while(1);
313 }
314
315 puts("Uncompressing Linux...\r\n");
316 gunzip();
317 puts("Done. Now booting the kernel.\r\n");
318 }
319