ARM: OMAP4: Add minimal support for omap4
[platform/kernel/linux-arm64.git] / arch / arm / plat-omap / common.c
1 /*
2  * linux/arch/arm/plat-omap/common.c
3  *
4  * Code common to all OMAP machines.
5  * The file is created by Tony Lindgren <tony@atomide.com>
6  *
7  * Copyright (C) 2009 Texas Instruments
8  * Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.com>
9  *
10  * This program is free software; you can redistribute it and/or modify
11  * it under the terms of the GNU General Public License version 2 as
12  * published by the Free Software Foundation.
13  */
14 #include <linux/module.h>
15 #include <linux/kernel.h>
16 #include <linux/init.h>
17 #include <linux/delay.h>
18 #include <linux/pm.h>
19 #include <linux/console.h>
20 #include <linux/serial.h>
21 #include <linux/tty.h>
22 #include <linux/serial_8250.h>
23 #include <linux/serial_reg.h>
24 #include <linux/clk.h>
25 #include <linux/io.h>
26
27 #include <mach/hardware.h>
28 #include <asm/system.h>
29 #include <asm/pgtable.h>
30 #include <asm/mach/map.h>
31 #include <asm/setup.h>
32
33 #include <mach/common.h>
34 #include <mach/board.h>
35 #include <mach/control.h>
36 #include <mach/mux.h>
37 #include <mach/fpga.h>
38
39 #include <mach/clock.h>
40
41 #if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3)
42 # include "../mach-omap2/sdrc.h"
43 #endif
44
45 #define NO_LENGTH_CHECK 0xffffffff
46
47 unsigned char omap_bootloader_tag[512];
48 int omap_bootloader_tag_len;
49
50 struct omap_board_config_kernel *omap_board_config;
51 int omap_board_config_size;
52
53 static const void *get_config(u16 tag, size_t len, int skip, size_t *len_out)
54 {
55         struct omap_board_config_kernel *kinfo = NULL;
56         int i;
57
58 #ifdef CONFIG_OMAP_BOOT_TAG
59         struct omap_board_config_entry *info = NULL;
60
61         if (omap_bootloader_tag_len > 4)
62                 info = (struct omap_board_config_entry *) omap_bootloader_tag;
63         while (info != NULL) {
64                 u8 *next;
65
66                 if (info->tag == tag) {
67                         if (skip == 0)
68                                 break;
69                         skip--;
70                 }
71
72                 if ((info->len & 0x03) != 0) {
73                         /* We bail out to avoid an alignment fault */
74                         printk(KERN_ERR "OMAP peripheral config: Length (%d) not word-aligned (tag %04x)\n",
75                                info->len, info->tag);
76                         return NULL;
77                 }
78                 next = (u8 *) info + sizeof(*info) + info->len;
79                 if (next >= omap_bootloader_tag + omap_bootloader_tag_len)
80                         info = NULL;
81                 else
82                         info = (struct omap_board_config_entry *) next;
83         }
84         if (info != NULL) {
85                 /* Check the length as a lame attempt to check for
86                  * binary inconsistency. */
87                 if (len != NO_LENGTH_CHECK) {
88                         /* Word-align len */
89                         if (len & 0x03)
90                                 len = (len + 3) & ~0x03;
91                         if (info->len != len) {
92                                 printk(KERN_ERR "OMAP peripheral config: Length mismatch with tag %x (want %d, got %d)\n",
93                                        tag, len, info->len);
94                                 return NULL;
95                         }
96                 }
97                 if (len_out != NULL)
98                         *len_out = info->len;
99                 return info->data;
100         }
101 #endif
102         /* Try to find the config from the board-specific structures
103          * in the kernel. */
104         for (i = 0; i < omap_board_config_size; i++) {
105                 if (omap_board_config[i].tag == tag) {
106                         if (skip == 0) {
107                                 kinfo = &omap_board_config[i];
108                                 break;
109                         } else {
110                                 skip--;
111                         }
112                 }
113         }
114         if (kinfo == NULL)
115                 return NULL;
116         return kinfo->data;
117 }
118
119 const void *__omap_get_config(u16 tag, size_t len, int nr)
120 {
121         return get_config(tag, len, nr, NULL);
122 }
123 EXPORT_SYMBOL(__omap_get_config);
124
125 const void *omap_get_var_config(u16 tag, size_t *len)
126 {
127         return get_config(tag, NO_LENGTH_CHECK, 0, len);
128 }
129 EXPORT_SYMBOL(omap_get_var_config);
130
131 static int __init omap_add_serial_console(void)
132 {
133         const struct omap_serial_console_config *con_info;
134         const struct omap_uart_config *uart_info;
135         static char speed[11], *opt = NULL;
136         int line, i, uart_idx;
137
138         uart_info = omap_get_config(OMAP_TAG_UART, struct omap_uart_config);
139         con_info = omap_get_config(OMAP_TAG_SERIAL_CONSOLE,
140                                         struct omap_serial_console_config);
141         if (uart_info == NULL || con_info == NULL)
142                 return 0;
143
144         if (con_info->console_uart == 0)
145                 return 0;
146
147         if (con_info->console_speed) {
148                 snprintf(speed, sizeof(speed), "%u", con_info->console_speed);
149                 opt = speed;
150         }
151
152         uart_idx = con_info->console_uart - 1;
153         if (uart_idx >= OMAP_MAX_NR_PORTS) {
154                 printk(KERN_INFO "Console: external UART#%d. "
155                         "Not adding it as console this time.\n",
156                         uart_idx + 1);
157                 return 0;
158         }
159         if (!(uart_info->enabled_uarts & (1 << uart_idx))) {
160                 printk(KERN_ERR "Console: Selected UART#%d is "
161                         "not enabled for this platform\n",
162                         uart_idx + 1);
163                 return -1;
164         }
165         line = 0;
166         for (i = 0; i < uart_idx; i++) {
167                 if (uart_info->enabled_uarts & (1 << i))
168                         line++;
169         }
170         return add_preferred_console("ttyS", line, opt);
171 }
172 console_initcall(omap_add_serial_console);
173
174
175 /*
176  * 32KHz clocksource ... always available, on pretty most chips except
177  * OMAP 730 and 1510.  Other timers could be used as clocksources, with
178  * higher resolution in free-running counter modes (e.g. 12 MHz xtal),
179  * but systems won't necessarily want to spend resources that way.
180  */
181
182 #define OMAP16XX_TIMER_32K_SYNCHRONIZED         0xfffbc410
183
184 #if !(defined(CONFIG_ARCH_OMAP730) || defined(CONFIG_ARCH_OMAP15XX))
185
186 #include <linux/clocksource.h>
187
188 #ifdef CONFIG_ARCH_OMAP16XX
189 static cycle_t omap16xx_32k_read(struct clocksource *cs)
190 {
191         return omap_readl(OMAP16XX_TIMER_32K_SYNCHRONIZED);
192 }
193 #else
194 #define omap16xx_32k_read       NULL
195 #endif
196
197 #ifdef CONFIG_ARCH_OMAP2420
198 static cycle_t omap2420_32k_read(struct clocksource *cs)
199 {
200         return omap_readl(OMAP2420_32KSYNCT_BASE + 0x10);
201 }
202 #else
203 #define omap2420_32k_read       NULL
204 #endif
205
206 #ifdef CONFIG_ARCH_OMAP2430
207 static cycle_t omap2430_32k_read(struct clocksource *cs)
208 {
209         return omap_readl(OMAP2430_32KSYNCT_BASE + 0x10);
210 }
211 #else
212 #define omap2430_32k_read       NULL
213 #endif
214
215 #ifdef CONFIG_ARCH_OMAP34XX
216 static cycle_t omap34xx_32k_read(struct clocksource *cs)
217 {
218         return omap_readl(OMAP3430_32KSYNCT_BASE + 0x10);
219 }
220 #else
221 #define omap34xx_32k_read       NULL
222 #endif
223
224 #ifdef CONFIG_ARCH_OMAP4
225 static cycle_t omap44xx_32k_read(struct clocksource *cs)
226 {
227         return omap_readl(OMAP4430_32KSYNCT_BASE + 0x10);
228 }
229 #else
230 #define omap44xx_32k_read       NULL
231 #endif
232
233 /*
234  * Kernel assumes that sched_clock can be called early but may not have
235  * things ready yet.
236  */
237 static cycle_t omap_32k_read_dummy(struct clocksource *cs)
238 {
239         return 0;
240 }
241
242 static struct clocksource clocksource_32k = {
243         .name           = "32k_counter",
244         .rating         = 250,
245         .read           = omap_32k_read_dummy,
246         .mask           = CLOCKSOURCE_MASK(32),
247         .shift          = 10,
248         .flags          = CLOCK_SOURCE_IS_CONTINUOUS,
249 };
250
251 /*
252  * Returns current time from boot in nsecs. It's OK for this to wrap
253  * around for now, as it's just a relative time stamp.
254  */
255 unsigned long long sched_clock(void)
256 {
257         unsigned long long ret;
258
259         ret = (unsigned long long)clocksource_32k.read(&clocksource_32k);
260         ret = (ret * clocksource_32k.mult_orig) >> clocksource_32k.shift;
261         return ret;
262 }
263
264 static int __init omap_init_clocksource_32k(void)
265 {
266         static char err[] __initdata = KERN_ERR
267                         "%s: can't register clocksource!\n";
268
269         if (cpu_is_omap16xx() || cpu_class_is_omap2()) {
270                 struct clk *sync_32k_ick;
271
272                 if (cpu_is_omap16xx())
273                         clocksource_32k.read = omap16xx_32k_read;
274                 else if (cpu_is_omap2420())
275                         clocksource_32k.read = omap2420_32k_read;
276                 else if (cpu_is_omap2430())
277                         clocksource_32k.read = omap2430_32k_read;
278                 else if (cpu_is_omap34xx())
279                         clocksource_32k.read = omap34xx_32k_read;
280                 else if (cpu_is_omap44xx())
281                         clocksource_32k.read = omap44xx_32k_read;
282                 else
283                         return -ENODEV;
284
285                 sync_32k_ick = clk_get(NULL, "omap_32ksync_ick");
286                 if (sync_32k_ick)
287                         clk_enable(sync_32k_ick);
288
289                 clocksource_32k.mult = clocksource_hz2mult(32768,
290                                             clocksource_32k.shift);
291
292                 if (clocksource_register(&clocksource_32k))
293                         printk(err, clocksource_32k.name);
294         }
295         return 0;
296 }
297 arch_initcall(omap_init_clocksource_32k);
298
299 #endif  /* !(defined(CONFIG_ARCH_OMAP730) || defined(CONFIG_ARCH_OMAP15XX)) */
300
301 /* Global address base setup code */
302
303 #if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3)
304
305 static void __init __omap2_set_globals(struct omap_globals *omap2_globals)
306 {
307         omap2_set_globals_tap(omap2_globals);
308         omap2_set_globals_sdrc(omap2_globals);
309         omap2_set_globals_control(omap2_globals);
310         omap2_set_globals_prcm(omap2_globals);
311 }
312
313 #endif
314
315 #if defined(CONFIG_ARCH_OMAP2420)
316
317 static struct omap_globals omap242x_globals = {
318         .class  = OMAP242X_CLASS,
319         .tap    = OMAP2_IO_ADDRESS(0x48014000),
320         .sdrc   = OMAP2_IO_ADDRESS(OMAP2420_SDRC_BASE),
321         .sms    = OMAP2_IO_ADDRESS(OMAP2420_SMS_BASE),
322         .ctrl   = OMAP2_IO_ADDRESS(OMAP2420_CTRL_BASE),
323         .prm    = OMAP2_IO_ADDRESS(OMAP2420_PRM_BASE),
324         .cm     = OMAP2_IO_ADDRESS(OMAP2420_CM_BASE),
325 };
326
327 void __init omap2_set_globals_242x(void)
328 {
329         __omap2_set_globals(&omap242x_globals);
330 }
331 #endif
332
333 #if defined(CONFIG_ARCH_OMAP2430)
334
335 static struct omap_globals omap243x_globals = {
336         .class  = OMAP243X_CLASS,
337         .tap    = OMAP2_IO_ADDRESS(0x4900a000),
338         .sdrc   = OMAP2_IO_ADDRESS(OMAP243X_SDRC_BASE),
339         .sms    = OMAP2_IO_ADDRESS(OMAP243X_SMS_BASE),
340         .ctrl   = OMAP2_IO_ADDRESS(OMAP243X_CTRL_BASE),
341         .prm    = OMAP2_IO_ADDRESS(OMAP2430_PRM_BASE),
342         .cm     = OMAP2_IO_ADDRESS(OMAP2430_CM_BASE),
343 };
344
345 void __init omap2_set_globals_243x(void)
346 {
347         __omap2_set_globals(&omap243x_globals);
348 }
349 #endif
350
351 #if defined(CONFIG_ARCH_OMAP3430)
352
353 static struct omap_globals omap343x_globals = {
354         .class  = OMAP343X_CLASS,
355         .tap    = OMAP2_IO_ADDRESS(0x4830A000),
356         .sdrc   = OMAP2_IO_ADDRESS(OMAP343X_SDRC_BASE),
357         .sms    = OMAP2_IO_ADDRESS(OMAP343X_SMS_BASE),
358         .ctrl   = OMAP2_IO_ADDRESS(OMAP343X_CTRL_BASE),
359         .prm    = OMAP2_IO_ADDRESS(OMAP3430_PRM_BASE),
360         .cm     = OMAP2_IO_ADDRESS(OMAP3430_CM_BASE),
361 };
362
363 void __init omap2_set_globals_343x(void)
364 {
365         __omap2_set_globals(&omap343x_globals);
366 }
367 #endif
368
369 #if defined(CONFIG_ARCH_OMAP4)
370 static struct omap_globals omap4_globals = {
371         .class  = OMAP443X_CLASS,
372         .tap    = OMAP2_IO_ADDRESS(0x4830a000),
373         .ctrl   = OMAP2_IO_ADDRESS(OMAP443X_CTRL_BASE),
374         .prm    = OMAP2_IO_ADDRESS(OMAP4430_PRM_BASE),
375         .cm     = OMAP2_IO_ADDRESS(OMAP4430_CM_BASE),
376 };
377
378 void __init omap2_set_globals_443x(void)
379 {
380         omap2_set_globals_tap(&omap4_globals);
381         omap2_set_globals_control(&omap4_globals);
382 }
383 #endif
384