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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 
 29 #include <asm/mach-ar7/ar7.h>
 30 #include <asm/mach-ar7/prom.h>
 31 
 32 #define MAX_ENTRY 80
 33 
 34 struct env_var {
 35         char    *name;
 36         char    *value;
 37 };
 38 
 39 static struct env_var adam2_env[MAX_ENTRY];
 40 
 41 char *prom_getenv(const char *name)
 42 {
 43         int i;
 44 
 45         for (i = 0; (i < MAX_ENTRY) && adam2_env[i].name; i++)
 46                 if (!strcmp(name, adam2_env[i].name))
 47                         return adam2_env[i].value;
 48 
 49         return NULL;
 50 }
 51 EXPORT_SYMBOL(prom_getenv);
 52 
 53 static void  __init ar7_init_cmdline(int argc, char *argv[])
 54 {
 55         int i;
 56 
 57         for (i = 1; i < argc; i++) {
 58                 strlcat(arcs_cmdline, argv[i], COMMAND_LINE_SIZE);
 59                 if (i < (argc - 1))
 60                         strlcat(arcs_cmdline, " ", COMMAND_LINE_SIZE);
 61         }
 62 }
 63 
 64 struct psbl_rec {
 65         u32     psbl_size;
 66         u32     env_base;
 67         u32     env_size;
 68         u32     ffs_base;
 69         u32     ffs_size;
 70 };
 71 
 72 static const char psp_env_version[] __initconst = "TIENV0.8";
 73 
 74 struct psp_env_chunk {
 75         u8      num;
 76         u8      ctrl;
 77         u16     csum;
 78         u8      len;
 79         char    data[11];
 80 } __packed;
 81 
 82 struct psp_var_map_entry {
 83         u8      num;
 84         char    *value;
 85 };
 86 
 87 static const struct psp_var_map_entry psp_var_map[] = {
 88         {  1,   "cpufrequency" },
 89         {  2,   "memsize" },
 90         {  3,   "flashsize" },
 91         {  4,   "modetty0" },
 92         {  5,   "modetty1" },
 93         {  8,   "maca" },
 94         {  9,   "macb" },
 95         { 28,   "sysfrequency" },
 96         { 38,   "mipsfrequency" },
 97 };
 98 
 99 /*
100 
101 Well-known variable (num is looked up in table above for matching variable name)
102 Example: cpufrequency=211968000
103 +----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+---
104 | 01 |CTRL|CHECKSUM | 01 | _2 | _1 | _1 | _9 | _6 | _8 | _0 | _0 | _0 | \0 | FF
105 +----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+---
106 
107 Name=Value pair in a single chunk
108 Example: NAME=VALUE
109 +----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+---
110 | 00 |CTRL|CHECKSUM | 01 | _N | _A | _M | _E | _0 | _V | _A | _L | _U | _E | \0
111 +----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+---
112 
113 Name=Value pair in 2 chunks (len is the number of chunks)
114 Example: bootloaderVersion=1.3.7.15
115 +----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+---
116 | 00 |CTRL|CHECKSUM | 02 | _b | _o | _o | _t | _l | _o | _a | _d | _e | _r | _V
117 +----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+---
118 | _e | _r | _s | _i | _o | _n | \0 | _1 | _. | _3 | _. | _7 | _. | _1 | _5 | \0
119 +----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+---
120 
121 Data is padded with 0xFF
122 
123 */
124 
125 #define PSP_ENV_SIZE  4096
126 
127 static char psp_env_data[PSP_ENV_SIZE] = { 0, };
128 
129 static char * __init lookup_psp_var_map(u8 num)
130 {
131         int i;
132 
133         for (i = 0; i < ARRAY_SIZE(psp_var_map); i++)
134                 if (psp_var_map[i].num == num)
135                         return psp_var_map[i].value;
136 
137         return NULL;
138 }
139 
140 static void __init add_adam2_var(char *name, char *value)
141 {
142         int i;
143 
144         for (i = 0; i < MAX_ENTRY; i++) {
145                 if (!adam2_env[i].name) {
146                         adam2_env[i].name = name;
147                         adam2_env[i].value = value;
148                         return;
149                 } else if (!strcmp(adam2_env[i].name, name)) {
150                         adam2_env[i].value = value;
151                         return;
152                 }
153         }
154 }
155 
156 static int __init parse_psp_env(void *psp_env_base)
157 {
158         int i, n;
159         char *name, *value;
160         struct psp_env_chunk *chunks = (struct psp_env_chunk *)psp_env_data;
161 
162         memcpy_fromio(chunks, psp_env_base, PSP_ENV_SIZE);
163 
164         i = 1;
165         n = PSP_ENV_SIZE / sizeof(struct psp_env_chunk);
166         while (i < n) {
167                 if ((chunks[i].num == 0xff) || ((i + chunks[i].len) > n))
168                         break;
169                 value = chunks[i].data;
170                 if (chunks[i].num) {
171                         name = lookup_psp_var_map(chunks[i].num);
172                 } else {
173                         name = value;
174                         value += strlen(name) + 1;
175                 }
176                 if (name)
177                         add_adam2_var(name, value);
178                 i += chunks[i].len;
179         }
180         return 0;
181 }
182 
183 static void __init ar7_init_env(struct env_var *env)
184 {
185         int i;
186         struct psbl_rec *psbl = (struct psbl_rec *)(KSEG1ADDR(0x14000300));
187         void *psp_env = (void *)KSEG1ADDR(psbl->env_base);
188 
189         if (strcmp(psp_env, psp_env_version) == 0) {
190                 parse_psp_env(psp_env);
191         } else {
192                 for (i = 0; i < MAX_ENTRY; i++, env++)
193                         if (env->name)
194                                 add_adam2_var(env->name, env->value);
195         }
196 }
197 
198 static void __init console_config(void)
199 {
200 #ifdef CONFIG_SERIAL_8250_CONSOLE
201         char console_string[40];
202         int baud = 0;
203         char parity = '\0', bits = '\0', flow = '\0';
204         char *s, *p;
205 
206         if (strstr(arcs_cmdline, "console="))
207                 return;
208 
209         s = prom_getenv("modetty0");
210         if (s) {
211                 baud = simple_strtoul(s, &p, 10);
212                 s = p;
213                 if (*s == ',')
214                         s++;
215                 if (*s)
216                         parity = *s++;
217                 if (*s == ',')
218                         s++;
219                 if (*s)
220                         bits = *s++;
221                 if (*s == ',')
222                         s++;
223                 if (*s == 'h')
224                         flow = 'r';
225         }
226 
227         if (baud == 0)
228                 baud = 38400;
229         if (parity != 'n' && parity != 'o' && parity != 'e')
230                 parity = 'n';
231         if (bits != '7' && bits != '8')
232                 bits = '8';
233 
234         if (flow == 'r')
235                 sprintf(console_string, " console=ttyS0,%d%c%c%c", baud,
236                         parity, bits, flow);
237         else
238                 sprintf(console_string, " console=ttyS0,%d%c%c", baud, parity,
239                         bits);
240         strlcat(arcs_cmdline, console_string, COMMAND_LINE_SIZE);
241 #endif
242 }
243 
244 void __init prom_init(void)
245 {
246         ar7_init_cmdline(fw_arg0, (char **)fw_arg1);
247         ar7_init_env((struct env_var *)fw_arg2);
248         console_config();
249 }
250 
251 #define PORT(offset) (KSEG1ADDR(AR7_REGS_UART0 + (offset * 4)))
252 static inline unsigned int serial_in(int offset)
253 {
254         return readl((void *)PORT(offset));
255 }
256 
257 static inline void serial_out(int offset, int value)
258 {
259         writel(value, (void *)PORT(offset));
260 }
261 
262 int prom_putchar(char c)
263 {
264         while ((serial_in(UART_LSR) & UART_LSR_TEMT) == 0)
265                 ;
266         serial_out(UART_TX, c);
267         return 1;
268 }
269 

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