1 /*
2  *
3  * Common functions for OMAP4/5 based boards
4  *
5  * (C) Copyright 2010
6  * Texas Instruments, <www.ti.com>
7  *
8  * Author :
9  *	Aneesh V	<aneesh@ti.com>
10  *	Steve Sakoman	<steve@sakoman.com>
11  *
12  * SPDX-License-Identifier:	GPL-2.0+
13  */
14 #include <common.h>
15 #include <debug_uart.h>
16 #include <spl.h>
17 #include <asm/arch/sys_proto.h>
18 #include <linux/sizes.h>
19 #include <asm/emif.h>
20 #include <asm/omap_common.h>
21 #include <linux/compiler.h>
22 #include <asm/system.h>
23 
24 DECLARE_GLOBAL_DATA_PTR;
25 
26 void do_set_mux(u32 base, struct pad_conf_entry const *array, int size)
27 {
28 	int i;
29 	struct pad_conf_entry *pad = (struct pad_conf_entry *) array;
30 
31 	for (i = 0; i < size; i++, pad++)
32 		writew(pad->val, base + pad->offset);
33 }
34 
35 static void set_mux_conf_regs(void)
36 {
37 	switch (omap_hw_init_context()) {
38 	case OMAP_INIT_CONTEXT_SPL:
39 		set_muxconf_regs();
40 		break;
41 	case OMAP_INIT_CONTEXT_UBOOT_AFTER_SPL:
42 		break;
43 	case OMAP_INIT_CONTEXT_UBOOT_FROM_NOR:
44 	case OMAP_INIT_CONTEXT_UBOOT_AFTER_CH:
45 		set_muxconf_regs();
46 		break;
47 	}
48 }
49 
50 u32 cortex_rev(void)
51 {
52 
53 	unsigned int rev;
54 
55 	/* Read Main ID Register (MIDR) */
56 	asm ("mrc p15, 0, %0, c0, c0, 0" : "=r" (rev));
57 
58 	return rev;
59 }
60 
61 static void omap_rev_string(void)
62 {
63 	u32 omap_rev = omap_revision();
64 	u32 soc_variant	= (omap_rev & 0xF0000000) >> 28;
65 	u32 omap_variant = (omap_rev & 0xFFFF0000) >> 16;
66 	u32 major_rev = (omap_rev & 0x00000F00) >> 8;
67 	u32 minor_rev = (omap_rev & 0x000000F0) >> 4;
68 
69 	const char *sec_s;
70 
71 	switch (get_device_type()) {
72 	case TST_DEVICE:
73 		sec_s = "TST";
74 		break;
75 	case EMU_DEVICE:
76 		sec_s = "EMU";
77 		break;
78 	case HS_DEVICE:
79 		sec_s = "HS";
80 		break;
81 	case GP_DEVICE:
82 		sec_s = "GP";
83 		break;
84 	default:
85 		sec_s = "?";
86 	}
87 
88 	if (soc_variant)
89 		printf("OMAP");
90 	else
91 		printf("DRA");
92 	printf("%x-%s ES%x.%x\n", omap_variant, sec_s, major_rev, minor_rev);
93 }
94 
95 #ifdef CONFIG_SPL_BUILD
96 void spl_display_print(void)
97 {
98 	omap_rev_string();
99 }
100 #endif
101 
102 void __weak srcomp_enable(void)
103 {
104 }
105 
106 /**
107  * do_board_detect() - Detect board description
108  *
109  * Function to detect board description. This is expected to be
110  * overridden in the SoC family board file where desired.
111  */
112 void __weak do_board_detect(void)
113 {
114 }
115 
116 /**
117  * vcores_init() - Assign omap_vcores based on board
118  *
119  * Function to pick the vcores based on board. This is expected to be
120  * overridden in the SoC family board file where desired.
121  */
122 void __weak vcores_init(void)
123 {
124 }
125 
126 void s_init(void)
127 {
128 }
129 
130 /**
131  * early_system_init - Does Early system initialization.
132  *
133  * Does early system init of watchdog, muxing,  andclocks
134  * Watchdog disable is done always. For the rest what gets done
135  * depends on the boot mode in which this function is executed when
136  *   1. SPL running from SRAM
137  *   2. U-Boot running from FLASH
138  *   3. U-Boot loaded to SDRAM by SPL
139  *   4. U-Boot loaded to SDRAM by ROM code using the
140  *	Configuration Header feature
141  * Please have a look at the respective functions to see what gets
142  * done in each of these cases
143  * This function is called with SRAM stack.
144  */
145 void early_system_init(void)
146 {
147 	init_omap_revision();
148 	hw_data_init();
149 
150 #ifdef CONFIG_SPL_BUILD
151 	if (warm_reset())
152 		force_emif_self_refresh();
153 #endif
154 	watchdog_init();
155 	set_mux_conf_regs();
156 #ifdef CONFIG_SPL_BUILD
157 	srcomp_enable();
158 	do_io_settings();
159 #endif
160 	setup_early_clocks();
161 #ifdef CONFIG_SPL_BUILD
162 	/*
163 	 * Save the boot parameters passed from romcode.
164 	 * We cannot delay the saving further than this,
165 	 * to prevent overwrites.
166 	 */
167 	save_omap_boot_params();
168 #endif
169 	do_board_detect();
170 #ifdef CONFIG_SPL_BUILD
171 	spl_early_init();
172 #endif
173 	vcores_init();
174 #ifdef CONFIG_DEBUG_UART_OMAP
175 	debug_uart_init();
176 #endif
177 	prcm_init();
178 }
179 
180 #ifdef CONFIG_SPL_BUILD
181 void board_init_f(ulong dummy)
182 {
183 	early_system_init();
184 #ifdef CONFIG_BOARD_EARLY_INIT_F
185 	board_early_init_f();
186 #endif
187 	/* For regular u-boot sdram_init() is called from dram_init() */
188 	sdram_init();
189 	gd->ram_size = omap_sdram_size();
190 }
191 #endif
192 
193 int arch_cpu_init_dm(void)
194 {
195 	early_system_init();
196 	return 0;
197 }
198 
199 /*
200  * Routine: wait_for_command_complete
201  * Description: Wait for posting to finish on watchdog
202  */
203 void wait_for_command_complete(struct watchdog *wd_base)
204 {
205 	int pending = 1;
206 	do {
207 		pending = readl(&wd_base->wwps);
208 	} while (pending);
209 }
210 
211 /*
212  * Routine: watchdog_init
213  * Description: Shut down watch dogs
214  */
215 void watchdog_init(void)
216 {
217 	struct watchdog *wd2_base = (struct watchdog *)WDT2_BASE;
218 
219 	writel(WD_UNLOCK1, &wd2_base->wspr);
220 	wait_for_command_complete(wd2_base);
221 	writel(WD_UNLOCK2, &wd2_base->wspr);
222 }
223 
224 
225 /*
226  * This function finds the SDRAM size available in the system
227  * based on DMM section configurations
228  * This is needed because the size of memory installed may be
229  * different on different versions of the board
230  */
231 u32 omap_sdram_size(void)
232 {
233 	u32 section, i, valid;
234 	u64 sdram_start = 0, sdram_end = 0, addr,
235 	    size, total_size = 0, trap_size = 0, trap_start = 0;
236 
237 	for (i = 0; i < 4; i++) {
238 		section	= __raw_readl(DMM_BASE + i*4);
239 		valid = (section & EMIF_SDRC_ADDRSPC_MASK) >>
240 			(EMIF_SDRC_ADDRSPC_SHIFT);
241 		addr = section & EMIF_SYS_ADDR_MASK;
242 
243 		/* See if the address is valid */
244 		if ((addr >= TI_ARMV7_DRAM_ADDR_SPACE_START) &&
245 		    (addr < TI_ARMV7_DRAM_ADDR_SPACE_END)) {
246 			size = ((section & EMIF_SYS_SIZE_MASK) >>
247 				   EMIF_SYS_SIZE_SHIFT);
248 			size = 1 << size;
249 			size *= SZ_16M;
250 
251 			if (valid != DMM_SDRC_ADDR_SPC_INVALID) {
252 				if (!sdram_start || (addr < sdram_start))
253 					sdram_start = addr;
254 				if (!sdram_end || ((addr + size) > sdram_end))
255 					sdram_end = addr + size;
256 			} else {
257 				trap_size = size;
258 				trap_start = addr;
259 			}
260 		}
261 	}
262 
263 	if ((trap_start >= sdram_start) && (trap_start < sdram_end))
264 		total_size = (sdram_end - sdram_start) - (trap_size);
265 	else
266 		total_size = sdram_end - sdram_start;
267 
268 	return total_size;
269 }
270 
271 
272 /*
273  * Routine: dram_init
274  * Description: sets uboots idea of sdram size
275  */
276 int dram_init(void)
277 {
278 	sdram_init();
279 	gd->ram_size = omap_sdram_size();
280 	return 0;
281 }
282 
283 /*
284  * Print board information
285  */
286 int checkboard(void)
287 {
288 	puts(sysinfo.board_string);
289 	return 0;
290 }
291 
292 #if defined(CONFIG_DISPLAY_CPUINFO)
293 /*
294  * Print CPU information
295  */
296 int print_cpuinfo(void)
297 {
298 	puts("CPU  : ");
299 	omap_rev_string();
300 
301 	return 0;
302 }
303 #endif
304