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 #include <asm/trace.h>
34 #if CONFIG_BFIN_KERNEL_CLOCK
35 #include <asm/mach-common/clocks.h>
36 #include <asm/mach/mem_init.h>
38 #if CONFIG_DEBUG_KERNEL_START
39 #include <asm/mach-common/def_LPBlackfin.h>
47 .extern _bf53x_relocate_l1_mem
49 #define INITIAL_STACK 0xFFB01000
54 /* R0: argument of command line string, passed from uboot, save it */
56 /* Enable Cycle Counter and Nesting Of Interrupts */
57 #ifdef CONFIG_BFIN_SCRATCH_REG_CYCLES
60 R0 = SYSCFG_SNEN | SYSCFG_CCEN;
65 /* Clear Out All the data and pointer Registers */
87 /* Clear Out All the DAG Registers */
103 trace_buffer_init(p0,r0);
107 #if CONFIG_DEBUG_KERNEL_START
110 * Set up a temporary Event Vector Table, so if something bad happens before
111 * the kernel is fully started, it doesn't vector off into the bootloaders
118 P2.l = debug_kernel_start_trap;
119 P2.h = debug_kernel_start_trap;
127 .Lfill_temp_vector_table:
128 [P0++] = P2; /* Core Event Vector Table */
130 if !CC JUMP .Lfill_temp_vector_table
137 p0.h = hi(FIO_MASKA_C);
138 p0.l = lo(FIO_MASKA_C);
140 w[p0] = r0.L; /* Disable all interrupts */
143 p0.h = hi(FIO_MASKB_C);
144 p0.l = lo(FIO_MASKB_C);
146 w[p0] = r0.L; /* Disable all interrupts */
149 /* Turn off the icache */
150 p0.l = LO(IMEM_CONTROL);
151 p0.h = HI(IMEM_CONTROL);
156 /* Anomaly 05000125 */
167 /* Turn off the dcache */
168 p0.l = LO(DMEM_CONTROL);
169 p0.h = HI(DMEM_CONTROL);
174 /* Anomaly 05000125 */
185 /* Initialise UART - when booting from u-boot, the UART is not disabled
186 * so if we dont initalize here, our serial console gets hosed */
190 w[p0] = r0.L; /* To enable DLL writes */
205 p0.h = hi(UART_GCTL);
206 p0.l = lo(UART_GCTL);
208 w[p0] = r0.L; /* To enable UART clock */
211 /* Initialize stack pointer */
212 sp.l = lo(INITIAL_STACK);
213 sp.h = hi(INITIAL_STACK);
217 /* Put The Code for PLL Programming and SDRAM Programming in L1 ISRAM */
218 call _bf53x_relocate_l1_mem;
219 #if CONFIG_BFIN_KERNEL_CLOCK
220 call _start_dma_code;
223 /* Code for initializing Async memory banks */
225 p2.h = hi(EBIU_AMBCTL1);
226 p2.l = lo(EBIU_AMBCTL1);
227 r0.h = hi(AMBCTL1VAL);
228 r0.l = lo(AMBCTL1VAL);
232 p2.h = hi(EBIU_AMBCTL0);
233 p2.l = lo(EBIU_AMBCTL0);
234 r0.h = hi(AMBCTL0VAL);
235 r0.l = lo(AMBCTL0VAL);
239 p2.h = hi(EBIU_AMGCTL);
240 p2.l = lo(EBIU_AMGCTL);
245 /* This section keeps the processor in supervisor mode
246 * during kernel boot. Switches to user mode at end of boot.
247 * See page 3-9 of Hardware Reference manual for documentation.
250 /* EVT15 = _real_start */
284 w[p0] = r0; /* watchdog off for now */
287 /* Code update for BSS size == 0
288 * Zero out the bss region.
297 lsetup (.L_clear_bss, .L_clear_bss) lc0 = p2;
301 /* In case there is a NULL pointer reference
302 * Zero out region before stext
312 lsetup (.L_clear_zero, .L_clear_zero) lc0 = p2;
316 /* pass the uboot arguments to the global value command line */
335 * load the current thread pointer and stack
337 r1.l = _init_thread_union;
338 r1.h = _init_thread_union;
346 jump.l _start_kernel;
352 #if CONFIG_BFIN_KERNEL_CLOCK
353 ENTRY(_start_dma_code)
363 * - [14:09] = MSEL[5:0] : CLKIN / VCO multiplication factors
364 * - [8] = BYPASS : BYPASS the PLL, run CLKIN into CCLK/SCLK
365 * - [7] = output delay (add 200ps of delay to mem signals)
366 * - [6] = input delay (add 200ps of input delay to mem signals)
367 * - [5] = PDWN : 1=All Clocks off
368 * - [3] = STOPCK : 1=Core Clock off
369 * - [1] = PLL_OFF : 1=Disable Power to PLL
370 * - [0] = DF : 1=Pass CLKIN/2 to PLL / 0=Pass CLKIN to PLL
371 * all other bits set to zero
374 p0.h = hi(PLL_LOCKCNT);
375 p0.l = lo(PLL_LOCKCNT);
380 P2.H = hi(EBIU_SDGCTL);
381 P2.L = lo(EBIU_SDGCTL);
387 r0 = CONFIG_VCO_MULT & 63; /* Load the VCO multiplier */
388 r0 = r0 << 9; /* Shift it over, */
389 r1 = CLKIN_HALF; /* Do we need to divide CLKIN by 2?*/
391 r1 = PLL_BYPASS; /* Bypass the PLL? */
392 r1 = r1 << 8; /* Shift it over */
393 r0 = r1 | r0; /* add them all together */
396 p0.l = lo(PLL_CTL); /* Load the address */
397 cli r2; /* Disable interrupts */
399 w[p0] = r0.l; /* Set the value */
400 idle; /* Wait for the PLL to stablize */
401 sti r2; /* Enable interrupts */
408 if ! CC jump .Lcheck_again;
410 /* Configure SCLK & CCLK Dividers */
411 r0 = (CONFIG_CCLK_ACT_DIV | CONFIG_SCLK_DIV);
417 p0.l = lo(EBIU_SDRRC);
418 p0.h = hi(EBIU_SDRRC);
423 p0.l = LO(EBIU_SDBCTL);
424 p0.h = HI(EBIU_SDBCTL); /* SDRAM Memory Bank Control Register */
429 P2.H = hi(EBIU_SDGCTL);
430 P2.L = lo(EBIU_SDGCTL);
433 p0.h = hi(EBIU_SDSTAT);
434 p0.l = lo(EBIU_SDSTAT);
444 R0.L = lo(mem_SDGCTL);
445 R0.H = hi(mem_SDGCTL);
453 r0.l = lo(IWR_ENABLE_ALL);
454 r0.h = hi(IWR_ENABLE_ALL);
459 ENDPROC(_start_dma_code)
460 #endif /* CONFIG_BFIN_KERNEL_CLOCK */
462 #if CONFIG_DEBUG_KERNEL_START
463 debug_kernel_start_trap:
464 /* Set up a temp stack in L1 - SDRAM might not be working */
465 P0.L = lo(L1_DATA_A_START + 0x100);
466 P0.H = hi(L1_DATA_A_START + 0x100);
469 /* Make sure the Clocks are the way I think they should be */
470 r0 = CONFIG_VCO_MULT & 63; /* Load the VCO multiplier */
471 r0 = r0 << 9; /* Shift it over, */
472 r1 = CLKIN_HALF; /* Do we need to divide CLKIN by 2?*/
474 r1 = PLL_BYPASS; /* Bypass the PLL? */
475 r1 = r1 << 8; /* Shift it over */
476 r0 = r1 | r0; /* add them all together */
479 p0.l = lo(PLL_CTL); /* Load the address */
480 cli r2; /* Disable interrupts */
482 w[p0] = r0.l; /* Set the value */
483 idle; /* Wait for the PLL to stablize */
484 sti r2; /* Enable interrupts */
491 if ! CC jump .Lcheck_again1;
493 /* Configure SCLK & CCLK Dividers */
494 r0 = (CONFIG_CCLK_ACT_DIV | CONFIG_SCLK_DIV);
500 /* Make sure UART is enabled - you can never be sure */
503 * Setup for console. Argument comes from the menuconfig
506 #ifdef CONFIG_BAUD_9600
507 #define CONSOLE_BAUD_RATE 9600
508 #elif CONFIG_BAUD_19200
509 #define CONSOLE_BAUD_RATE 19200
510 #elif CONFIG_BAUD_38400
511 #define CONSOLE_BAUD_RATE 38400
512 #elif CONFIG_BAUD_57600
513 #define CONSOLE_BAUD_RATE 57600
514 #elif CONFIG_BAUD_115200
515 #define CONSOLE_BAUD_RATE 115200
518 p0.h = hi(UART_GCTL);
519 p0.l = lo(UART_GCTL);
521 w[p0] = r0.L; /* To Turn off UART clocks */
527 w[p0] = r0.L; /* To enable DLL writes */
530 R1 = (((CONFIG_CLKIN_HZ * CONFIG_VCO_MULT) / CONFIG_SCLK_DIV) / (CONSOLE_BAUD_RATE * 16));
545 p0.h = hi(UART_GCTL);
546 p0.l = lo(UART_GCTL);
548 w[p0] = r0.L; /* To enable UART clock */
554 w[p0] = r0.L; /* To Turn on UART */
557 p0.h = hi(UART_GCTL);
558 p0.l = lo(UART_GCTL);
560 w[p0] = r0.L; /* To Turn on UART Clocks */
636 .Ldebug_kernel_start_trap_done:
637 JUMP .Ldebug_kernel_start_trap_done;
641 R5 = ':'; /* one past 9 */
650 if CC JUMP .Ldump_reg1;
656 if !CC JUMP .Ldump_reg1;
660 if !CC JUMP .Ldump_reg2
666 if !CC JUMP .Lwait_char;
670 #endif /* CONFIG_DEBUG_KERNEL_START */
675 * Set up the usable of RAM stuff. Size of RAM is determined then
676 * an initial stack set up at the end.