1 /*
2 * linux/arch/arm/plat-omap/common.c
3 *
4 * Code common to all OMAP machines.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10 #include <linux/module.h>
11 #include <linux/kernel.h>
12 #include <linux/init.h>
13 #include <linux/delay.h>
14 #include <linux/pm.h>
15 #include <linux/console.h>
16 #include <linux/serial.h>
17 #include <linux/tty.h>
18 #include <linux/serial_8250.h>
19 #include <linux/serial_reg.h>
20 #include <linux/clk.h>
21 #include <linux/io.h>
22
23 #include <mach/hardware.h>
24 #include <asm/system.h>
25 #include <asm/pgtable.h>
26 #include <asm/mach/map.h>
27 #include <asm/setup.h>
28
29 #include <mach/common.h>
30 #include <mach/board.h>
31 #include <mach/control.h>
32 #include <mach/mux.h>
33 #include <mach/fpga.h>
34
35 #include <mach/clock.h>
36
37 #if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3)
38 # include "../mach-omap2/sdrc.h"
39 #endif
40
41 #define NO_LENGTH_CHECK 0xffffffff
42
43 unsigned char omap_bootloader_tag[512];
44 int omap_bootloader_tag_len;
45
46 struct omap_board_config_kernel *omap_board_config;
47 int omap_board_config_size;
48
get_config(u16 tag,size_t len,int skip,size_t * len_out)49 static const void *get_config(u16 tag, size_t len, int skip, size_t *len_out)
50 {
51 struct omap_board_config_kernel *kinfo = NULL;
52 int i;
53
54 #ifdef CONFIG_OMAP_BOOT_TAG
55 struct omap_board_config_entry *info = NULL;
56
57 if (omap_bootloader_tag_len > 4)
58 info = (struct omap_board_config_entry *) omap_bootloader_tag;
59 while (info != NULL) {
60 u8 *next;
61
62 if (info->tag == tag) {
63 if (skip == 0)
64 break;
65 skip--;
66 }
67
68 if ((info->len & 0x03) != 0) {
69 /* We bail out to avoid an alignment fault */
70 printk(KERN_ERR "OMAP peripheral config: Length (%d) not word-aligned (tag %04x)\n",
71 info->len, info->tag);
72 return NULL;
73 }
74 next = (u8 *) info + sizeof(*info) + info->len;
75 if (next >= omap_bootloader_tag + omap_bootloader_tag_len)
76 info = NULL;
77 else
78 info = (struct omap_board_config_entry *) next;
79 }
80 if (info != NULL) {
81 /* Check the length as a lame attempt to check for
82 * binary inconsistency. */
83 if (len != NO_LENGTH_CHECK) {
84 /* Word-align len */
85 if (len & 0x03)
86 len = (len + 3) & ~0x03;
87 if (info->len != len) {
88 printk(KERN_ERR "OMAP peripheral config: Length mismatch with tag %x (want %d, got %d)\n",
89 tag, len, info->len);
90 return NULL;
91 }
92 }
93 if (len_out != NULL)
94 *len_out = info->len;
95 return info->data;
96 }
97 #endif
98 /* Try to find the config from the board-specific structures
99 * in the kernel. */
100 for (i = 0; i < omap_board_config_size; i++) {
101 if (omap_board_config[i].tag == tag) {
102 if (skip == 0) {
103 kinfo = &omap_board_config[i];
104 break;
105 } else {
106 skip--;
107 }
108 }
109 }
110 if (kinfo == NULL)
111 return NULL;
112 return kinfo->data;
113 }
114
__omap_get_config(u16 tag,size_t len,int nr)115 const void *__omap_get_config(u16 tag, size_t len, int nr)
116 {
117 return get_config(tag, len, nr, NULL);
118 }
119 EXPORT_SYMBOL(__omap_get_config);
120
omap_get_var_config(u16 tag,size_t * len)121 const void *omap_get_var_config(u16 tag, size_t *len)
122 {
123 return get_config(tag, NO_LENGTH_CHECK, 0, len);
124 }
125 EXPORT_SYMBOL(omap_get_var_config);
126
omap_add_serial_console(void)127 static int __init omap_add_serial_console(void)
128 {
129 const struct omap_serial_console_config *con_info;
130 const struct omap_uart_config *uart_info;
131 static char speed[11], *opt = NULL;
132 int line, i, uart_idx;
133
134 uart_info = omap_get_config(OMAP_TAG_UART, struct omap_uart_config);
135 con_info = omap_get_config(OMAP_TAG_SERIAL_CONSOLE,
136 struct omap_serial_console_config);
137 if (uart_info == NULL || con_info == NULL)
138 return 0;
139
140 if (con_info->console_uart == 0)
141 return 0;
142
143 if (con_info->console_speed) {
144 snprintf(speed, sizeof(speed), "%u", con_info->console_speed);
145 opt = speed;
146 }
147
148 uart_idx = con_info->console_uart - 1;
149 if (uart_idx >= OMAP_MAX_NR_PORTS) {
150 printk(KERN_INFO "Console: external UART#%d. "
151 "Not adding it as console this time.\n",
152 uart_idx + 1);
153 return 0;
154 }
155 if (!(uart_info->enabled_uarts & (1 << uart_idx))) {
156 printk(KERN_ERR "Console: Selected UART#%d is "
157 "not enabled for this platform\n",
158 uart_idx + 1);
159 return -1;
160 }
161 line = 0;
162 for (i = 0; i < uart_idx; i++) {
163 if (uart_info->enabled_uarts & (1 << i))
164 line++;
165 }
166 return add_preferred_console("ttyS", line, opt);
167 }
168 console_initcall(omap_add_serial_console);
169
170
171 /*
172 * 32KHz clocksource ... always available, on pretty most chips except
173 * OMAP 730 and 1510. Other timers could be used as clocksources, with
174 * higher resolution in free-running counter modes (e.g. 12 MHz xtal),
175 * but systems won't necessarily want to spend resources that way.
176 */
177
178 #if defined(CONFIG_ARCH_OMAP16XX)
179 #define TIMER_32K_SYNCHRONIZED 0xfffbc410
180 #elif defined(CONFIG_ARCH_OMAP24XX) || defined(CONFIG_ARCH_OMAP34XX)
181 #define TIMER_32K_SYNCHRONIZED (OMAP2_32KSYNCT_BASE + 0x10)
182 #endif
183
184 #ifdef TIMER_32K_SYNCHRONIZED
185
186 #include <linux/clocksource.h>
187
omap_32k_read(void)188 static cycle_t omap_32k_read(void)
189 {
190 return omap_readl(TIMER_32K_SYNCHRONIZED);
191 }
192
193 static struct clocksource clocksource_32k = {
194 .name = "32k_counter",
195 .rating = 250,
196 .read = omap_32k_read,
197 .mask = CLOCKSOURCE_MASK(32),
198 .shift = 10,
199 .flags = CLOCK_SOURCE_IS_CONTINUOUS,
200 };
201
202 /*
203 * Returns current time from boot in nsecs. It's OK for this to wrap
204 * around for now, as it's just a relative time stamp.
205 */
sched_clock(void)206 unsigned long long sched_clock(void)
207 {
208 unsigned long long ret;
209
210 ret = (unsigned long long)omap_32k_read();
211 ret = (ret * clocksource_32k.mult_orig) >> clocksource_32k.shift;
212 return ret;
213 }
214
omap_init_clocksource_32k(void)215 static int __init omap_init_clocksource_32k(void)
216 {
217 static char err[] __initdata = KERN_ERR
218 "%s: can't register clocksource!\n";
219
220 if (cpu_is_omap16xx() || cpu_class_is_omap2()) {
221 struct clk *sync_32k_ick;
222
223 sync_32k_ick = clk_get(NULL, "omap_32ksync_ick");
224 if (sync_32k_ick)
225 clk_enable(sync_32k_ick);
226
227 clocksource_32k.mult = clocksource_hz2mult(32768,
228 clocksource_32k.shift);
229
230 if (clocksource_register(&clocksource_32k))
231 printk(err, clocksource_32k.name);
232 }
233 return 0;
234 }
235 arch_initcall(omap_init_clocksource_32k);
236
237 #endif /* TIMER_32K_SYNCHRONIZED */
238
239 /* Global address base setup code */
240
241 #if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3)
242
243 static struct omap_globals *omap2_globals;
244
__omap2_set_globals(void)245 static void __init __omap2_set_globals(void)
246 {
247 omap2_set_globals_tap(omap2_globals);
248 omap2_set_globals_memory(omap2_globals);
249 omap2_set_globals_control(omap2_globals);
250 omap2_set_globals_prcm(omap2_globals);
251 }
252
253 #endif
254
255 #if defined(CONFIG_ARCH_OMAP2420)
256
257 static struct omap_globals omap242x_globals = {
258 .class = OMAP242X_CLASS,
259 .tap = OMAP2_IO_ADDRESS(0x48014000),
260 .sdrc = OMAP2_IO_ADDRESS(OMAP2420_SDRC_BASE),
261 .sms = OMAP2_IO_ADDRESS(OMAP2420_SMS_BASE),
262 .ctrl = OMAP2_IO_ADDRESS(OMAP2420_CTRL_BASE),
263 .prm = OMAP2_IO_ADDRESS(OMAP2420_PRM_BASE),
264 .cm = OMAP2_IO_ADDRESS(OMAP2420_CM_BASE),
265 };
266
omap2_set_globals_242x(void)267 void __init omap2_set_globals_242x(void)
268 {
269 omap2_globals = &omap242x_globals;
270 __omap2_set_globals();
271 }
272 #endif
273
274 #if defined(CONFIG_ARCH_OMAP2430)
275
276 static struct omap_globals omap243x_globals = {
277 .class = OMAP243X_CLASS,
278 .tap = OMAP2_IO_ADDRESS(0x4900a000),
279 .sdrc = OMAP2_IO_ADDRESS(OMAP243X_SDRC_BASE),
280 .sms = OMAP2_IO_ADDRESS(OMAP243X_SMS_BASE),
281 .ctrl = OMAP2_IO_ADDRESS(OMAP243X_CTRL_BASE),
282 .prm = OMAP2_IO_ADDRESS(OMAP2430_PRM_BASE),
283 .cm = OMAP2_IO_ADDRESS(OMAP2430_CM_BASE),
284 };
285
omap2_set_globals_243x(void)286 void __init omap2_set_globals_243x(void)
287 {
288 omap2_globals = &omap243x_globals;
289 __omap2_set_globals();
290 }
291 #endif
292
293 #if defined(CONFIG_ARCH_OMAP3430)
294
295 static struct omap_globals omap343x_globals = {
296 .class = OMAP343X_CLASS,
297 .tap = OMAP2_IO_ADDRESS(0x4830A000),
298 .sdrc = OMAP2_IO_ADDRESS(OMAP343X_SDRC_BASE),
299 .sms = OMAP2_IO_ADDRESS(OMAP343X_SMS_BASE),
300 .ctrl = OMAP2_IO_ADDRESS(OMAP343X_CTRL_BASE),
301 .prm = OMAP2_IO_ADDRESS(OMAP3430_PRM_BASE),
302 .cm = OMAP2_IO_ADDRESS(OMAP3430_CM_BASE),
303 };
304
omap2_set_globals_343x(void)305 void __init omap2_set_globals_343x(void)
306 {
307 omap2_globals = &omap343x_globals;
308 __omap2_set_globals();
309 }
310 #endif
311
312