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Linux/arch/mips/ar7/prom.c

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  1 // SPDX-License-Identifier: GPL-2.0-only
  2 /*
  3  * Carsten Langgaard, carstenl@mips.com
  4  * Copyright (C) 1999,2000 MIPS Technologies, Inc.  All rights reserved.
  5  *
  6  * Putting things on the screen/serial line using YAMONs facilities.
  7  */
  8 #include <linux/init.h>
  9 #include <linux/kernel.h>
 10 #include <linux/serial_reg.h>
 11 #include <linux/spinlock.h>
 12 #include <linux/export.h>
 13 #include <linux/string.h>
 14 #include <linux/io.h>
 15 #include <asm/bootinfo.h>
 16 #include <asm/setup.h>
 17 
 18 #include <asm/mach-ar7/ar7.h>
 19 #include <asm/mach-ar7/prom.h>
 20 
 21 #define MAX_ENTRY 80
 22 
 23 struct env_var {
 24         char    *name;
 25         char    *value;
 26 };
 27 
 28 static struct env_var adam2_env[MAX_ENTRY];
 29 
 30 char *prom_getenv(const char *name)
 31 {
 32         int i;
 33 
 34         for (i = 0; (i < MAX_ENTRY) && adam2_env[i].name; i++)
 35                 if (!strcmp(name, adam2_env[i].name))
 36                         return adam2_env[i].value;
 37 
 38         return NULL;
 39 }
 40 EXPORT_SYMBOL(prom_getenv);
 41 
 42 static void  __init ar7_init_cmdline(int argc, char *argv[])
 43 {
 44         int i;
 45 
 46         for (i = 1; i < argc; i++) {
 47                 strlcat(arcs_cmdline, argv[i], COMMAND_LINE_SIZE);
 48                 if (i < (argc - 1))
 49                         strlcat(arcs_cmdline, " ", COMMAND_LINE_SIZE);
 50         }
 51 }
 52 
 53 struct psbl_rec {
 54         u32     psbl_size;
 55         u32     env_base;
 56         u32     env_size;
 57         u32     ffs_base;
 58         u32     ffs_size;
 59 };
 60 
 61 static const char psp_env_version[] __initconst = "TIENV0.8";
 62 
 63 struct psp_env_chunk {
 64         u8      num;
 65         u8      ctrl;
 66         u16     csum;
 67         u8      len;
 68         char    data[11];
 69 } __packed;
 70 
 71 struct psp_var_map_entry {
 72         u8      num;
 73         char    *value;
 74 };
 75 
 76 static const struct psp_var_map_entry psp_var_map[] = {
 77         {  1,   "cpufrequency" },
 78         {  2,   "memsize" },
 79         {  3,   "flashsize" },
 80         {  4,   "modetty0" },
 81         {  5,   "modetty1" },
 82         {  8,   "maca" },
 83         {  9,   "macb" },
 84         { 28,   "sysfrequency" },
 85         { 38,   "mipsfrequency" },
 86 };
 87 
 88 /*
 89 
 90 Well-known variable (num is looked up in table above for matching variable name)
 91 Example: cpufrequency=211968000
 92 +----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+---
 93 | 01 |CTRL|CHECKSUM | 01 | _2 | _1 | _1 | _9 | _6 | _8 | _0 | _0 | _0 | \0 | FF
 94 +----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+---
 95 
 96 Name=Value pair in a single chunk
 97 Example: NAME=VALUE
 98 +----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+---
 99 | 00 |CTRL|CHECKSUM | 01 | _N | _A | _M | _E | _0 | _V | _A | _L | _U | _E | \0
100 +----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+---
101 
102 Name=Value pair in 2 chunks (len is the number of chunks)
103 Example: bootloaderVersion=1.3.7.15
104 +----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+---
105 | 00 |CTRL|CHECKSUM | 02 | _b | _o | _o | _t | _l | _o | _a | _d | _e | _r | _V
106 +----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+---
107 | _e | _r | _s | _i | _o | _n | \0 | _1 | _. | _3 | _. | _7 | _. | _1 | _5 | \0
108 +----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+---
109 
110 Data is padded with 0xFF
111 
112 */
113 
114 #define PSP_ENV_SIZE  4096
115 
116 static char psp_env_data[PSP_ENV_SIZE] = { 0, };
117 
118 static char * __init lookup_psp_var_map(u8 num)
119 {
120         int i;
121 
122         for (i = 0; i < ARRAY_SIZE(psp_var_map); i++)
123                 if (psp_var_map[i].num == num)
124                         return psp_var_map[i].value;
125 
126         return NULL;
127 }
128 
129 static void __init add_adam2_var(char *name, char *value)
130 {
131         int i;
132 
133         for (i = 0; i < MAX_ENTRY; i++) {
134                 if (!adam2_env[i].name) {
135                         adam2_env[i].name = name;
136                         adam2_env[i].value = value;
137                         return;
138                 } else if (!strcmp(adam2_env[i].name, name)) {
139                         adam2_env[i].value = value;
140                         return;
141                 }
142         }
143 }
144 
145 static int __init parse_psp_env(void *psp_env_base)
146 {
147         int i, n;
148         char *name, *value;
149         struct psp_env_chunk *chunks = (struct psp_env_chunk *)psp_env_data;
150 
151         memcpy_fromio(chunks, psp_env_base, PSP_ENV_SIZE);
152 
153         i = 1;
154         n = PSP_ENV_SIZE / sizeof(struct psp_env_chunk);
155         while (i < n) {
156                 if ((chunks[i].num == 0xff) || ((i + chunks[i].len) > n))
157                         break;
158                 value = chunks[i].data;
159                 if (chunks[i].num) {
160                         name = lookup_psp_var_map(chunks[i].num);
161                 } else {
162                         name = value;
163                         value += strlen(name) + 1;
164                 }
165                 if (name)
166                         add_adam2_var(name, value);
167                 i += chunks[i].len;
168         }
169         return 0;
170 }
171 
172 static void __init ar7_init_env(struct env_var *env)
173 {
174         int i;
175         struct psbl_rec *psbl = (struct psbl_rec *)(KSEG1ADDR(0x14000300));
176         void *psp_env = (void *)KSEG1ADDR(psbl->env_base);
177 
178         if (strcmp(psp_env, psp_env_version) == 0) {
179                 parse_psp_env(psp_env);
180         } else {
181                 for (i = 0; i < MAX_ENTRY; i++, env++)
182                         if (env->name)
183                                 add_adam2_var(env->name, env->value);
184         }
185 }
186 
187 static void __init console_config(void)
188 {
189 #ifdef CONFIG_SERIAL_8250_CONSOLE
190         char console_string[40];
191         int baud = 0;
192         char parity = '\0', bits = '\0', flow = '\0';
193         char *s, *p;
194 
195         if (strstr(arcs_cmdline, "console="))
196                 return;
197 
198         s = prom_getenv("modetty0");
199         if (s) {
200                 baud = simple_strtoul(s, &p, 10);
201                 s = p;
202                 if (*s == ',')
203                         s++;
204                 if (*s)
205                         parity = *s++;
206                 if (*s == ',')
207                         s++;
208                 if (*s)
209                         bits = *s++;
210                 if (*s == ',')
211                         s++;
212                 if (*s == 'h')
213                         flow = 'r';
214         }
215 
216         if (baud == 0)
217                 baud = 38400;
218         if (parity != 'n' && parity != 'o' && parity != 'e')
219                 parity = 'n';
220         if (bits != '7' && bits != '8')
221                 bits = '8';
222 
223         if (flow == 'r')
224                 sprintf(console_string, " console=ttyS0,%d%c%c%c", baud,
225                         parity, bits, flow);
226         else
227                 sprintf(console_string, " console=ttyS0,%d%c%c", baud, parity,
228                         bits);
229         strlcat(arcs_cmdline, console_string, COMMAND_LINE_SIZE);
230 #endif
231 }
232 
233 void __init prom_init(void)
234 {
235         ar7_init_cmdline(fw_arg0, (char **)fw_arg1);
236         ar7_init_env((struct env_var *)fw_arg2);
237         console_config();
238 }
239 
240 #define PORT(offset) (KSEG1ADDR(AR7_REGS_UART0 + (offset * 4)))
241 static inline unsigned int serial_in(int offset)
242 {
243         return readl((void *)PORT(offset));
244 }
245 
246 static inline void serial_out(int offset, int value)
247 {
248         writel(value, (void *)PORT(offset));
249 }
250 
251 void prom_putchar(char c)
252 {
253         while ((serial_in(UART_LSR) & UART_LSR_TEMT) == 0)
254                 ;
255         serial_out(UART_TX, c);
256 }
257 

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