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 <asm/blackfin.h>
32 #if CONFIG_BFIN_KERNEL_CLOCK
33 #include <asm/mach/mem_init.h>
35 #if CONFIG_DEBUG_KERNEL_START
36 #include <asm/mach-common/def_LPBlackfin.h>
44 .extern _bf53x_relocate_l1_mem
46 #define INITIAL_STACK 0xFFB01000
52 /* R0: argument of command line string, passed from uboot, save it */
54 /* Set the SYSCFG register */
56 /*Enable Cycle Counter and Nesting Of Interrupts(3rd Bit)*/
60 /*Clear Out All the data and pointer Registers*/
82 /* Clear Out All the DAG Registers*/
98 #if CONFIG_DEBUG_KERNEL_START
101 * Set up a temporary Event Vector Table, so if something bad happens before
102 * the kernel is fully started, it doesn't vector off into the bootloaders
109 P2.l = debug_kernel_start_trap;
110 P2.h = debug_kernel_start_trap;
118 .Lfill_temp_vector_table:
119 [P0++] = P2; /* Core Event Vector Table */
121 if !CC JUMP .Lfill_temp_vector_table
128 p0.h = hi(FIO_MASKA_C);
129 p0.l = lo(FIO_MASKA_C);
131 w[p0] = r0.L; /* Disable all interrupts */
134 p0.h = hi(FIO_MASKB_C);
135 p0.l = lo(FIO_MASKB_C);
137 w[p0] = r0.L; /* Disable all interrupts */
140 /* Turn off the icache */
141 p0.l = (IMEM_CONTROL & 0xFFFF);
142 p0.h = (IMEM_CONTROL >> 16);
147 /* Anomaly 05000125 */
148 #ifdef ANOMALY_05000125
154 #ifdef ANOMALY_05000125
158 /* Turn off the dcache */
159 p0.l = (DMEM_CONTROL & 0xFFFF);
160 p0.h = (DMEM_CONTROL >> 16);
165 /* Anomaly 05000125 */
166 #ifdef ANOMALY_05000125
172 #ifdef ANOMALY_05000125
176 /* Initialise UART - when booting from u-boot, the UART is not disabled
177 * so if we dont initalize here, our serial console gets hosed */
181 w[p0] = r0.L; /* To enable DLL writes */
196 p0.h = hi(UART_GCTL);
197 p0.l = lo(UART_GCTL);
199 w[p0] = r0.L; /* To enable UART clock */
202 /* Initialize stack pointer */
203 sp.l = lo(INITIAL_STACK);
204 sp.h = hi(INITIAL_STACK);
208 /* Put The Code for PLL Programming and SDRAM Programming in L1 ISRAM */
209 call _bf53x_relocate_l1_mem;
210 #if CONFIG_BFIN_KERNEL_CLOCK
211 call _start_dma_code;
214 /* Code for initializing Async memory banks */
216 p2.h = hi(EBIU_AMBCTL1);
217 p2.l = lo(EBIU_AMBCTL1);
218 r0.h = hi(AMBCTL1VAL);
219 r0.l = lo(AMBCTL1VAL);
223 p2.h = hi(EBIU_AMBCTL0);
224 p2.l = lo(EBIU_AMBCTL0);
225 r0.h = hi(AMBCTL0VAL);
226 r0.l = lo(AMBCTL0VAL);
230 p2.h = hi(EBIU_AMGCTL);
231 p2.l = lo(EBIU_AMGCTL);
236 /* This section keeps the processor in supervisor mode
237 * during kernel boot. Switches to user mode at end of boot.
238 * See page 3-9 of Hardware Reference manual for documentation.
241 /* EVT15 = _real_start */
261 #if defined(ANOMALY_05000281)
274 w[p0] = r0; /* watchdog off for now */
277 /* Code update for BSS size == 0
278 * Zero out the bss region.
287 lsetup (.L_clear_bss, .L_clear_bss) lc0 = p2;
291 /* In case there is a NULL pointer reference
292 * Zero out region before stext
302 lsetup (.L_clear_zero, .L_clear_zero) lc0 = p2;
306 /* pass the uboot arguments to the global value command line */
325 * load the current thread pointer and stack
327 r1.l = _init_thread_union;
328 r1.h = _init_thread_union;
341 #if CONFIG_BFIN_KERNEL_CLOCK
342 ENTRY(_start_dma_code)
352 * - [14:09] = MSEL[5:0] : CLKIN / VCO multiplication factors
353 * - [8] = BYPASS : BYPASS the PLL, run CLKIN into CCLK/SCLK
354 * - [7] = output delay (add 200ps of delay to mem signals)
355 * - [6] = input delay (add 200ps of input delay to mem signals)
356 * - [5] = PDWN : 1=All Clocks off
357 * - [3] = STOPCK : 1=Core Clock off
358 * - [1] = PLL_OFF : 1=Disable Power to PLL
359 * - [0] = DF : 1=Pass CLKIN/2 to PLL / 0=Pass CLKIN to PLL
360 * all other bits set to zero
363 p0.h = hi(PLL_LOCKCNT);
364 p0.l = lo(PLL_LOCKCNT);
369 P2.H = hi(EBIU_SDGCTL);
370 P2.L = lo(EBIU_SDGCTL);
376 r0 = CONFIG_VCO_MULT & 63; /* Load the VCO multiplier */
377 r0 = r0 << 9; /* Shift it over, */
378 r1 = CLKIN_HALF; /* Do we need to divide CLKIN by 2?*/
380 r1 = PLL_BYPASS; /* Bypass the PLL? */
381 r1 = r1 << 8; /* Shift it over */
382 r0 = r1 | r0; /* add them all together */
385 p0.l = lo(PLL_CTL); /* Load the address */
386 cli r2; /* Disable interrupts */
388 w[p0] = r0.l; /* Set the value */
389 idle; /* Wait for the PLL to stablize */
390 sti r2; /* Enable interrupts */
397 if ! CC jump .Lcheck_again;
399 /* Configure SCLK & CCLK Dividers */
400 r0 = (CONFIG_CCLK_ACT_DIV | CONFIG_SCLK_DIV);
406 p0.l = lo(EBIU_SDRRC);
407 p0.h = hi(EBIU_SDRRC);
412 p0.l = (EBIU_SDBCTL & 0xFFFF);
413 p0.h = (EBIU_SDBCTL >> 16); /* SDRAM Memory Bank Control Register */
418 P2.H = hi(EBIU_SDGCTL);
419 P2.L = lo(EBIU_SDGCTL);
422 p0.h = hi(EBIU_SDSTAT);
423 p0.l = lo(EBIU_SDSTAT);
433 R0.L = lo(mem_SDGCTL);
434 R0.H = hi(mem_SDGCTL);
442 r0.l = lo(IWR_ENABLE_ALL)
443 r0.h = hi(IWR_ENABLE_ALL)
448 #endif /* CONFIG_BFIN_KERNEL_CLOCK */
451 /* No more interrupts to be handled*/
455 #if defined(CONFIG_BFIN_SHARED_FLASH_ENET)
458 r0.l = ~(1 << CONFIG_ENET_FLASH_PIN);
463 r0.l = (1 << CONFIG_ENET_FLASH_PIN);
466 p0.h = hi(FIO_FLAG_C);
467 p0.l = lo(FIO_FLAG_C);
468 r0.l = (1 << CONFIG_ENET_FLASH_PIN);
472 /* Clear the IMASK register */
478 /* Clear the ILAT register */
485 /* make sure SYSCR is set to use BMODE */
492 /* issue a system soft reset */
499 /* clear system soft reset */
504 /* issue core reset */
510 #if CONFIG_DEBUG_KERNEL_START
511 debug_kernel_start_trap:
512 /* Set up a temp stack in L1 - SDRAM might not be working */
513 P0.L = lo(L1_DATA_A_START + 0x100);
514 P0.H = hi(L1_DATA_A_START + 0x100);
517 /* Make sure the Clocks are the way I think they should be */
518 r0 = CONFIG_VCO_MULT & 63; /* Load the VCO multiplier */
519 r0 = r0 << 9; /* Shift it over, */
520 r1 = CLKIN_HALF; /* Do we need to divide CLKIN by 2?*/
522 r1 = PLL_BYPASS; /* Bypass the PLL? */
523 r1 = r1 << 8; /* Shift it over */
524 r0 = r1 | r0; /* add them all together */
527 p0.l = lo(PLL_CTL); /* Load the address */
528 cli r2; /* Disable interrupts */
530 w[p0] = r0.l; /* Set the value */
531 idle; /* Wait for the PLL to stablize */
532 sti r2; /* Enable interrupts */
539 if ! CC jump .Lcheck_again1;
541 /* Configure SCLK & CCLK Dividers */
542 r0 = (CONFIG_CCLK_ACT_DIV | CONFIG_SCLK_DIV);
548 /* Make sure UART is enabled - you can never be sure */
551 * Setup for console. Argument comes from the menuconfig
554 #ifdef CONFIG_BAUD_9600
555 #define CONSOLE_BAUD_RATE 9600
556 #elif CONFIG_BAUD_19200
557 #define CONSOLE_BAUD_RATE 19200
558 #elif CONFIG_BAUD_38400
559 #define CONSOLE_BAUD_RATE 38400
560 #elif CONFIG_BAUD_57600
561 #define CONSOLE_BAUD_RATE 57600
562 #elif CONFIG_BAUD_115200
563 #define CONSOLE_BAUD_RATE 115200
566 p0.h = hi(UART_GCTL);
567 p0.l = lo(UART_GCTL);
569 w[p0] = r0.L; /* To Turn off UART clocks */
575 w[p0] = r0.L; /* To enable DLL writes */
578 R1 = (((CONFIG_CLKIN_HZ * CONFIG_VCO_MULT) / CONFIG_SCLK_DIV) / (CONSOLE_BAUD_RATE * 16));
593 p0.h = hi(UART_GCTL);
594 p0.l = lo(UART_GCTL);
596 w[p0] = r0.L; /* To enable UART clock */
602 w[p0] = r0.L; /* To Turn on UART */
605 p0.h = hi(UART_GCTL);
606 p0.l = lo(UART_GCTL);
608 w[p0] = r0.L; /* To Turn on UART Clocks */
684 .Ldebug_kernel_start_trap_done:
685 JUMP .Ldebug_kernel_start_trap_done;
689 R5 = ':'; /* one past 9 */
698 if CC JUMP .Ldump_reg1;
704 if !CC JUMP .Ldump_reg1;
708 if !CC JUMP .Ldump_reg2
714 if !CC JUMP .Lwait_char;
718 #endif /* CONFIG_DEBUG_KERNEL_START */
723 * Set up the usable of RAM stuff. Size of RAM is determined then
724 * an initial stack set up at the end.