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Linux/arch/mips/ar7/prom.c

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  1 /*
  2  * Carsten Langgaard, carstenl@mips.com
  3  * Copyright (C) 1999,2000 MIPS Technologies, Inc.  All rights reserved.
  4  *
  5  *  This program is free software; you can distribute it and/or modify it
  6  *  under the terms of the GNU General Public License (Version 2) as
  7  *  published by the Free Software Foundation.
  8  *
  9  *  This program is distributed in the hope it will be useful, but WITHOUT
 10  *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 11  *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 12  *  for more details.
 13  *
 14  *  You should have received a copy of the GNU General Public License along
 15  *  with this program; if not, write to the Free Software Foundation, Inc.,
 16  *  59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
 17  *
 18  * Putting things on the screen/serial line using YAMONs facilities.
 19  */
 20 #include <linux/init.h>
 21 #include <linux/kernel.h>
 22 #include <linux/serial_reg.h>
 23 #include <linux/spinlock.h>
 24 #include <linux/export.h>
 25 #include <linux/string.h>
 26 #include <linux/io.h>
 27 #include <asm/bootinfo.h>
 28 #include <asm/setup.h>
 29 
 30 #include <asm/mach-ar7/ar7.h>
 31 #include <asm/mach-ar7/prom.h>
 32 
 33 #define MAX_ENTRY 80
 34 
 35 struct env_var {
 36         char    *name;
 37         char    *value;
 38 };
 39 
 40 static struct env_var adam2_env[MAX_ENTRY];
 41 
 42 char *prom_getenv(const char *name)
 43 {
 44         int i;
 45 
 46         for (i = 0; (i < MAX_ENTRY) && adam2_env[i].name; i++)
 47                 if (!strcmp(name, adam2_env[i].name))
 48                         return adam2_env[i].value;
 49 
 50         return NULL;
 51 }
 52 EXPORT_SYMBOL(prom_getenv);
 53 
 54 static void  __init ar7_init_cmdline(int argc, char *argv[])
 55 {
 56         int i;
 57 
 58         for (i = 1; i < argc; i++) {
 59                 strlcat(arcs_cmdline, argv[i], COMMAND_LINE_SIZE);
 60                 if (i < (argc - 1))
 61                         strlcat(arcs_cmdline, " ", COMMAND_LINE_SIZE);
 62         }
 63 }
 64 
 65 struct psbl_rec {
 66         u32     psbl_size;
 67         u32     env_base;
 68         u32     env_size;
 69         u32     ffs_base;
 70         u32     ffs_size;
 71 };
 72 
 73 static const char psp_env_version[] __initconst = "TIENV0.8";
 74 
 75 struct psp_env_chunk {
 76         u8      num;
 77         u8      ctrl;
 78         u16     csum;
 79         u8      len;
 80         char    data[11];
 81 } __packed;
 82 
 83 struct psp_var_map_entry {
 84         u8      num;
 85         char    *value;
 86 };
 87 
 88 static const struct psp_var_map_entry psp_var_map[] = {
 89         {  1,   "cpufrequency" },
 90         {  2,   "memsize" },
 91         {  3,   "flashsize" },
 92         {  4,   "modetty0" },
 93         {  5,   "modetty1" },
 94         {  8,   "maca" },
 95         {  9,   "macb" },
 96         { 28,   "sysfrequency" },
 97         { 38,   "mipsfrequency" },
 98 };
 99 
100 /*
101 
102 Well-known variable (num is looked up in table above for matching variable name)
103 Example: cpufrequency=211968000
104 +----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+---
105 | 01 |CTRL|CHECKSUM | 01 | _2 | _1 | _1 | _9 | _6 | _8 | _0 | _0 | _0 | \0 | FF
106 +----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+---
107 
108 Name=Value pair in a single chunk
109 Example: NAME=VALUE
110 +----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+---
111 | 00 |CTRL|CHECKSUM | 01 | _N | _A | _M | _E | _0 | _V | _A | _L | _U | _E | \0
112 +----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+---
113 
114 Name=Value pair in 2 chunks (len is the number of chunks)
115 Example: bootloaderVersion=1.3.7.15
116 +----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+---
117 | 00 |CTRL|CHECKSUM | 02 | _b | _o | _o | _t | _l | _o | _a | _d | _e | _r | _V
118 +----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+---
119 | _e | _r | _s | _i | _o | _n | \0 | _1 | _. | _3 | _. | _7 | _. | _1 | _5 | \0
120 +----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+---
121 
122 Data is padded with 0xFF
123 
124 */
125 
126 #define PSP_ENV_SIZE  4096
127 
128 static char psp_env_data[PSP_ENV_SIZE] = { 0, };
129 
130 static char * __init lookup_psp_var_map(u8 num)
131 {
132         int i;
133 
134         for (i = 0; i < ARRAY_SIZE(psp_var_map); i++)
135                 if (psp_var_map[i].num == num)
136                         return psp_var_map[i].value;
137 
138         return NULL;
139 }
140 
141 static void __init add_adam2_var(char *name, char *value)
142 {
143         int i;
144 
145         for (i = 0; i < MAX_ENTRY; i++) {
146                 if (!adam2_env[i].name) {
147                         adam2_env[i].name = name;
148                         adam2_env[i].value = value;
149                         return;
150                 } else if (!strcmp(adam2_env[i].name, name)) {
151                         adam2_env[i].value = value;
152                         return;
153                 }
154         }
155 }
156 
157 static int __init parse_psp_env(void *psp_env_base)
158 {
159         int i, n;
160         char *name, *value;
161         struct psp_env_chunk *chunks = (struct psp_env_chunk *)psp_env_data;
162 
163         memcpy_fromio(chunks, psp_env_base, PSP_ENV_SIZE);
164 
165         i = 1;
166         n = PSP_ENV_SIZE / sizeof(struct psp_env_chunk);
167         while (i < n) {
168                 if ((chunks[i].num == 0xff) || ((i + chunks[i].len) > n))
169                         break;
170                 value = chunks[i].data;
171                 if (chunks[i].num) {
172                         name = lookup_psp_var_map(chunks[i].num);
173                 } else {
174                         name = value;
175                         value += strlen(name) + 1;
176                 }
177                 if (name)
178                         add_adam2_var(name, value);
179                 i += chunks[i].len;
180         }
181         return 0;
182 }
183 
184 static void __init ar7_init_env(struct env_var *env)
185 {
186         int i;
187         struct psbl_rec *psbl = (struct psbl_rec *)(KSEG1ADDR(0x14000300));
188         void *psp_env = (void *)KSEG1ADDR(psbl->env_base);
189 
190         if (strcmp(psp_env, psp_env_version) == 0) {
191                 parse_psp_env(psp_env);
192         } else {
193                 for (i = 0; i < MAX_ENTRY; i++, env++)
194                         if (env->name)
195                                 add_adam2_var(env->name, env->value);
196         }
197 }
198 
199 static void __init console_config(void)
200 {
201 #ifdef CONFIG_SERIAL_8250_CONSOLE
202         char console_string[40];
203         int baud = 0;
204         char parity = '\0', bits = '\0', flow = '\0';
205         char *s, *p;
206 
207         if (strstr(arcs_cmdline, "console="))
208                 return;
209 
210         s = prom_getenv("modetty0");
211         if (s) {
212                 baud = simple_strtoul(s, &p, 10);
213                 s = p;
214                 if (*s == ',')
215                         s++;
216                 if (*s)
217                         parity = *s++;
218                 if (*s == ',')
219                         s++;
220                 if (*s)
221                         bits = *s++;
222                 if (*s == ',')
223                         s++;
224                 if (*s == 'h')
225                         flow = 'r';
226         }
227 
228         if (baud == 0)
229                 baud = 38400;
230         if (parity != 'n' && parity != 'o' && parity != 'e')
231                 parity = 'n';
232         if (bits != '7' && bits != '8')
233                 bits = '8';
234 
235         if (flow == 'r')
236                 sprintf(console_string, " console=ttyS0,%d%c%c%c", baud,
237                         parity, bits, flow);
238         else
239                 sprintf(console_string, " console=ttyS0,%d%c%c", baud, parity,
240                         bits);
241         strlcat(arcs_cmdline, console_string, COMMAND_LINE_SIZE);
242 #endif
243 }
244 
245 void __init prom_init(void)
246 {
247         ar7_init_cmdline(fw_arg0, (char **)fw_arg1);
248         ar7_init_env((struct env_var *)fw_arg2);
249         console_config();
250 }
251 
252 #define PORT(offset) (KSEG1ADDR(AR7_REGS_UART0 + (offset * 4)))
253 static inline unsigned int serial_in(int offset)
254 {
255         return readl((void *)PORT(offset));
256 }
257 
258 static inline void serial_out(int offset, int value)
259 {
260         writel(value, (void *)PORT(offset));
261 }
262 
263 void prom_putchar(char c)
264 {
265         while ((serial_in(UART_LSR) & UART_LSR_TEMT) == 0)
266                 ;
267         serial_out(UART_TX, c);
268 }
269 

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