2 * File: arch/blackfin/mach-bf561/head.S
3 * Based on: arch/blackfin/mach-bf533/head.S
7 * Description: BF561 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>
41 .extern _bf53x_relocate_l1_mem
43 #define INITIAL_STACK 0xFFB01000
49 /* R0: argument of command line string, passed from uboot, save it */
51 /* Set the SYSCFG register */
53 SYSCFG = R0; /*Enable Cycle Counter and Nesting Of Interrupts(3rd Bit)*/
56 /*Clear Out All the data and pointer Registers*/
78 /* Clear Out All the DAG Registers*/
94 /* Turn off the icache */
95 p0.l = (IMEM_CONTROL & 0xFFFF);
96 p0.h = (IMEM_CONTROL >> 16);
101 /* Anomaly 05000125 */
102 #ifdef ANOMALY_05000125
108 #ifdef ANOMALY_05000125
112 /* Turn off the dcache */
113 p0.l = (DMEM_CONTROL & 0xFFFF);
114 p0.h = (DMEM_CONTROL >> 16);
119 /* Anomaly 05000125 */
120 #ifdef ANOMALY_05000125
126 #ifdef ANOMALY_05000125
134 w[p0] = r0.L; /* To enable DLL writes */
149 p0.h = hi(UART_GCTL);
150 p0.l = lo(UART_GCTL);
152 w[p0] = r0.L; /* To enable UART clock */
155 /* Initialize stack pointer */
156 sp.l = lo(INITIAL_STACK);
157 sp.h = hi(INITIAL_STACK);
161 /* Put The Code for PLL Programming and SDRAM Programming in L1 ISRAM */
162 call _bf53x_relocate_l1_mem;
163 #if CONFIG_BFIN_KERNEL_CLOCK
164 call _start_dma_code;
167 /* Code for initializing Async memory banks */
169 p2.h = hi(EBIU_AMBCTL1);
170 p2.l = lo(EBIU_AMBCTL1);
171 r0.h = hi(AMBCTL1VAL);
172 r0.l = lo(AMBCTL1VAL);
176 p2.h = hi(EBIU_AMBCTL0);
177 p2.l = lo(EBIU_AMBCTL0);
178 r0.h = hi(AMBCTL0VAL);
179 r0.l = lo(AMBCTL0VAL);
183 p2.h = hi(EBIU_AMGCTL);
184 p2.l = lo(EBIU_AMGCTL);
189 /* This section keeps the processor in supervisor mode
190 * during kernel boot. Switches to user mode at end of boot.
191 * See page 3-9 of Hardware Reference manual for documentation.
194 /* EVT15 = _real_start */
214 #if defined(ANOMALY_05000281)
224 p0.l = lo(WDOGA_CTL);
225 p0.h = hi(WDOGA_CTL);
227 w[p0] = r0; /* watchdog off for now */
230 /* Code update for BSS size == 0
231 * Zero out the bss region.
240 lsetup (.L_clear_bss, .L_clear_bss ) lc0 = p2;
244 /* In case there is a NULL pointer reference
245 * Zero out region before stext
255 lsetup (.L_clear_zero, .L_clear_zero ) lc0 = p2;
259 /* pass the uboot arguments to the global value command line */
278 * load the current thread pointer and stack
280 r1.l = _init_thread_union;
281 r1.h = _init_thread_union;
294 #if CONFIG_BFIN_KERNEL_CLOCK
295 ENTRY(_start_dma_code)
296 p0.h = hi(SICA_IWR0);
297 p0.l = lo(SICA_IWR0);
304 * - [14:09] = MSEL[5:0] : CLKIN / VCO multiplication factors
305 * - [8] = BYPASS : BYPASS the PLL, run CLKIN into CCLK/SCLK
306 * - [7] = output delay (add 200ps of delay to mem signals)
307 * - [6] = input delay (add 200ps of input delay to mem signals)
308 * - [5] = PDWN : 1=All Clocks off
309 * - [3] = STOPCK : 1=Core Clock off
310 * - [1] = PLL_OFF : 1=Disable Power to PLL
311 * - [0] = DF : 1=Pass CLKIN/2 to PLL / 0=Pass CLKIN to PLL
312 * all other bits set to zero
315 p0.h = hi(PLL_LOCKCNT);
316 p0.l = lo(PLL_LOCKCNT);
321 P2.H = hi(EBIU_SDGCTL);
322 P2.L = lo(EBIU_SDGCTL);
328 r0 = CONFIG_VCO_MULT & 63; /* Load the VCO multiplier */
329 r0 = r0 << 9; /* Shift it over, */
330 r1 = CLKIN_HALF; /* Do we need to divide CLKIN by 2?*/
332 r1 = PLL_BYPASS; /* Bypass the PLL? */
333 r1 = r1 << 8; /* Shift it over */
334 r0 = r1 | r0; /* add them all together */
337 p0.l = lo(PLL_CTL); /* Load the address */
338 cli r2; /* Disable interrupts */
340 w[p0] = r0.l; /* Set the value */
341 idle; /* Wait for the PLL to stablize */
342 sti r2; /* Enable interrupts */
349 if ! CC jump .Lcheck_again;
351 /* Configure SCLK & CCLK Dividers */
352 r0 = (CONFIG_CCLK_ACT_DIV | CONFIG_SCLK_DIV);
358 p0.l = lo(EBIU_SDRRC);
359 p0.h = hi(EBIU_SDRRC);
364 p0.l = (EBIU_SDBCTL & 0xFFFF);
365 p0.h = (EBIU_SDBCTL >> 16); /* SDRAM Memory Bank Control Register */
370 P2.H = hi(EBIU_SDGCTL);
371 P2.L = lo(EBIU_SDGCTL);
374 p0.h = hi(EBIU_SDSTAT);
375 p0.l = lo(EBIU_SDSTAT);
385 R0.L = lo(mem_SDGCTL);
386 R0.H = hi(mem_SDGCTL);
393 #endif /* CONFIG_BFIN_KERNEL_CLOCK */
396 /* No more interrupts to be handled*/
400 #if defined(CONFIG_BFIN_SHARED_FLASH_ENET)
411 p0.h = hi(FIO_FLAG_C);
412 p0.l = lo(FIO_FLAG_C);
417 /* Clear the bits 13-15 in SWRST if they werent cleared */
418 p0.h = hi(SICA_SWRST);
419 p0.l = lo(SICA_SWRST);
423 /* Clear the IMASK register */
429 /* Clear the ILAT register */
436 /* Disable the WDOG TIMER */
437 p0.h = hi(WDOGA_CTL);
438 p0.l = lo(WDOGA_CTL);
443 /* Clear the sticky bit incase it is already set */
444 p0.h = hi(WDOGA_CTL);
445 p0.l = lo(WDOGA_CTL);
450 /* Program the count value */
453 P0.h = hi(WDOGA_CNT);
454 P0.l = lo(WDOGA_CNT);
458 /* Program WDOG_STAT if necessary */
459 P0.h = hi(WDOGA_CTL);
460 P0.l = lo(WDOGA_CTL);
463 if !CC JUMP .LWRITESTAT;
465 if !CC JUMP .LWRITESTAT;
469 /* When watch dog timer is enabled,
470 * a write to STAT will load the contents of CNT to STAT
473 P0.h = hi(WDOGA_STAT);
474 P0.l = lo(WDOGA_STAT)
479 /* Enable the reset event */
480 P0.h = hi(WDOGA_CTL);
481 P0.l = lo(WDOGA_CTL);
489 /* Enable the wdog counter */
502 * Set up the usable of RAM stuff. Size of RAM is determined then
503 * an initial stack set up at the end.