2 * File: arch/blackfin/mach-bf533/head.S
4 * Author: Jeff Dionne <jeff@uclinux.org> COPYRIGHT 1998 D. Jeff Dionne
7 * Description: bf533 startup file
10 * Copyright 2004-2006 Analog Devices Inc.
12 * Bugs: Enter bugs at http://blackfin.uclinux.org/
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2 of the License, or
17 * (at your option) any later version.
19 * This program is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU General Public License for more details.
24 * You should have received a copy of the GNU General Public License
25 * along with this program; if not, see the file COPYING, or write
26 * to the Free Software Foundation, Inc.,
27 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
30 #include <linux/linkage.h>
31 #include <linux/init.h>
32 #include <asm/blackfin.h>
33 #if CONFIG_BFIN_KERNEL_CLOCK
34 #include <asm/mach/mem_init.h>
36 #if CONFIG_DEBUG_KERNEL_START
37 #include <asm/mach-common/def_LPBlackfin.h>
45 .extern _bf53x_relocate_l1_mem
47 #define INITIAL_STACK 0xFFB01000
52 /* R0: argument of command line string, passed from uboot, save it */
54 /* Set the SYSCFG register:
55 * Enable Cycle Counter and Nesting Of Interrupts (3rd Bit)
61 /* Clear Out All the data and pointer Registers */
83 /* Clear Out All the DAG Registers */
99 #if CONFIG_DEBUG_KERNEL_START
102 * Set up a temporary Event Vector Table, so if something bad happens before
103 * the kernel is fully started, it doesn't vector off into the bootloaders
110 P2.l = debug_kernel_start_trap;
111 P2.h = debug_kernel_start_trap;
119 .Lfill_temp_vector_table:
120 [P0++] = P2; /* Core Event Vector Table */
122 if !CC JUMP .Lfill_temp_vector_table
129 p0.h = hi(FIO_MASKA_C);
130 p0.l = lo(FIO_MASKA_C);
132 w[p0] = r0.L; /* Disable all interrupts */
135 p0.h = hi(FIO_MASKB_C);
136 p0.l = lo(FIO_MASKB_C);
138 w[p0] = r0.L; /* Disable all interrupts */
141 /* Turn off the icache */
142 p0.l = (IMEM_CONTROL & 0xFFFF);
143 p0.h = (IMEM_CONTROL >> 16);
148 /* Anomaly 05000125 */
149 #ifdef ANOMALY_05000125
155 #ifdef ANOMALY_05000125
159 /* Turn off the dcache */
160 p0.l = (DMEM_CONTROL & 0xFFFF);
161 p0.h = (DMEM_CONTROL >> 16);
166 /* Anomaly 05000125 */
167 #ifdef ANOMALY_05000125
173 #ifdef ANOMALY_05000125
177 /* Initialise UART - when booting from u-boot, the UART is not disabled
178 * so if we dont initalize here, our serial console gets hosed */
182 w[p0] = r0.L; /* To enable DLL writes */
197 p0.h = hi(UART_GCTL);
198 p0.l = lo(UART_GCTL);
200 w[p0] = r0.L; /* To enable UART clock */
203 /* Initialize stack pointer */
204 sp.l = lo(INITIAL_STACK);
205 sp.h = hi(INITIAL_STACK);
209 /* Put The Code for PLL Programming and SDRAM Programming in L1 ISRAM */
210 call _bf53x_relocate_l1_mem;
211 #if CONFIG_BFIN_KERNEL_CLOCK
212 call _start_dma_code;
215 /* Code for initializing Async memory banks */
217 p2.h = hi(EBIU_AMBCTL1);
218 p2.l = lo(EBIU_AMBCTL1);
219 r0.h = hi(AMBCTL1VAL);
220 r0.l = lo(AMBCTL1VAL);
224 p2.h = hi(EBIU_AMBCTL0);
225 p2.l = lo(EBIU_AMBCTL0);
226 r0.h = hi(AMBCTL0VAL);
227 r0.l = lo(AMBCTL0VAL);
231 p2.h = hi(EBIU_AMGCTL);
232 p2.l = lo(EBIU_AMGCTL);
237 /* This section keeps the processor in supervisor mode
238 * during kernel boot. Switches to user mode at end of boot.
239 * See page 3-9 of Hardware Reference manual for documentation.
242 /* EVT15 = _real_start */
262 #if defined(ANOMALY_05000281)
276 w[p0] = r0; /* watchdog off for now */
279 /* Code update for BSS size == 0
280 * Zero out the bss region.
289 lsetup (.L_clear_bss, .L_clear_bss) lc0 = p2;
293 /* In case there is a NULL pointer reference
294 * Zero out region before stext
304 lsetup (.L_clear_zero, .L_clear_zero) lc0 = p2;
308 /* pass the uboot arguments to the global value command line */
327 * load the current thread pointer and stack
329 r1.l = _init_thread_union;
330 r1.h = _init_thread_union;
338 jump.l _start_kernel;
344 #if CONFIG_BFIN_KERNEL_CLOCK
345 ENTRY(_start_dma_code)
355 * - [14:09] = MSEL[5:0] : CLKIN / VCO multiplication factors
356 * - [8] = BYPASS : BYPASS the PLL, run CLKIN into CCLK/SCLK
357 * - [7] = output delay (add 200ps of delay to mem signals)
358 * - [6] = input delay (add 200ps of input delay to mem signals)
359 * - [5] = PDWN : 1=All Clocks off
360 * - [3] = STOPCK : 1=Core Clock off
361 * - [1] = PLL_OFF : 1=Disable Power to PLL
362 * - [0] = DF : 1=Pass CLKIN/2 to PLL / 0=Pass CLKIN to PLL
363 * all other bits set to zero
366 p0.h = hi(PLL_LOCKCNT);
367 p0.l = lo(PLL_LOCKCNT);
372 P2.H = hi(EBIU_SDGCTL);
373 P2.L = lo(EBIU_SDGCTL);
379 r0 = CONFIG_VCO_MULT & 63; /* Load the VCO multiplier */
380 r0 = r0 << 9; /* Shift it over, */
381 r1 = CLKIN_HALF; /* Do we need to divide CLKIN by 2?*/
383 r1 = PLL_BYPASS; /* Bypass the PLL? */
384 r1 = r1 << 8; /* Shift it over */
385 r0 = r1 | r0; /* add them all together */
388 p0.l = lo(PLL_CTL); /* Load the address */
389 cli r2; /* Disable interrupts */
391 w[p0] = r0.l; /* Set the value */
392 idle; /* Wait for the PLL to stablize */
393 sti r2; /* Enable interrupts */
400 if ! CC jump .Lcheck_again;
402 /* Configure SCLK & CCLK Dividers */
403 r0 = (CONFIG_CCLK_ACT_DIV | CONFIG_SCLK_DIV);
409 p0.l = lo(EBIU_SDRRC);
410 p0.h = hi(EBIU_SDRRC);
415 p0.l = (EBIU_SDBCTL & 0xFFFF);
416 p0.h = (EBIU_SDBCTL >> 16); /* SDRAM Memory Bank Control Register */
421 P2.H = hi(EBIU_SDGCTL);
422 P2.L = lo(EBIU_SDGCTL);
425 p0.h = hi(EBIU_SDSTAT);
426 p0.l = lo(EBIU_SDSTAT);
436 R0.L = lo(mem_SDGCTL);
437 R0.H = hi(mem_SDGCTL);
445 r0.l = lo(IWR_ENABLE_ALL);
446 r0.h = hi(IWR_ENABLE_ALL);
451 ENDPROC(_start_dma_code)
452 #endif /* CONFIG_BFIN_KERNEL_CLOCK */
455 /* No more interrupts to be handled*/
459 #if defined(CONFIG_BFIN_SHARED_FLASH_ENET)
462 r0.l = ~(1 << CONFIG_ENET_FLASH_PIN);
467 r0.l = (1 << CONFIG_ENET_FLASH_PIN);
470 p0.h = hi(FIO_FLAG_C);
471 p0.l = lo(FIO_FLAG_C);
472 r0.l = (1 << CONFIG_ENET_FLASH_PIN);
476 /* Clear the IMASK register */
482 /* Clear the ILAT register */
489 /* make sure SYSCR is set to use BMODE */
496 /* issue a system soft reset */
503 /* clear system soft reset */
508 /* issue core reset */
514 #if CONFIG_DEBUG_KERNEL_START
515 debug_kernel_start_trap:
516 /* Set up a temp stack in L1 - SDRAM might not be working */
517 P0.L = lo(L1_DATA_A_START + 0x100);
518 P0.H = hi(L1_DATA_A_START + 0x100);
521 /* Make sure the Clocks are the way I think they should be */
522 r0 = CONFIG_VCO_MULT & 63; /* Load the VCO multiplier */
523 r0 = r0 << 9; /* Shift it over, */
524 r1 = CLKIN_HALF; /* Do we need to divide CLKIN by 2?*/
526 r1 = PLL_BYPASS; /* Bypass the PLL? */
527 r1 = r1 << 8; /* Shift it over */
528 r0 = r1 | r0; /* add them all together */
531 p0.l = lo(PLL_CTL); /* Load the address */
532 cli r2; /* Disable interrupts */
534 w[p0] = r0.l; /* Set the value */
535 idle; /* Wait for the PLL to stablize */
536 sti r2; /* Enable interrupts */
543 if ! CC jump .Lcheck_again1;
545 /* Configure SCLK & CCLK Dividers */
546 r0 = (CONFIG_CCLK_ACT_DIV | CONFIG_SCLK_DIV);
552 /* Make sure UART is enabled - you can never be sure */
555 * Setup for console. Argument comes from the menuconfig
558 #ifdef CONFIG_BAUD_9600
559 #define CONSOLE_BAUD_RATE 9600
560 #elif CONFIG_BAUD_19200
561 #define CONSOLE_BAUD_RATE 19200
562 #elif CONFIG_BAUD_38400
563 #define CONSOLE_BAUD_RATE 38400
564 #elif CONFIG_BAUD_57600
565 #define CONSOLE_BAUD_RATE 57600
566 #elif CONFIG_BAUD_115200
567 #define CONSOLE_BAUD_RATE 115200
570 p0.h = hi(UART_GCTL);
571 p0.l = lo(UART_GCTL);
573 w[p0] = r0.L; /* To Turn off UART clocks */
579 w[p0] = r0.L; /* To enable DLL writes */
582 R1 = (((CONFIG_CLKIN_HZ * CONFIG_VCO_MULT) / CONFIG_SCLK_DIV) / (CONSOLE_BAUD_RATE * 16));
597 p0.h = hi(UART_GCTL);
598 p0.l = lo(UART_GCTL);
600 w[p0] = r0.L; /* To enable UART clock */
606 w[p0] = r0.L; /* To Turn on UART */
609 p0.h = hi(UART_GCTL);
610 p0.l = lo(UART_GCTL);
612 w[p0] = r0.L; /* To Turn on UART Clocks */
688 .Ldebug_kernel_start_trap_done:
689 JUMP .Ldebug_kernel_start_trap_done;
693 R5 = ':'; /* one past 9 */
702 if CC JUMP .Ldump_reg1;
708 if !CC JUMP .Ldump_reg1;
712 if !CC JUMP .Ldump_reg2
718 if !CC JUMP .Lwait_char;
722 #endif /* CONFIG_DEBUG_KERNEL_START */
727 * Set up the usable of RAM stuff. Size of RAM is determined then
728 * an initial stack set up at the end.