2 * File: arch/blackfin/mach-bf548/head.S
3 * Based on: arch/blackfin/mach-bf537/head.S
4 * Author: Jeff Dionne <jeff@uclinux.org> COPYRIGHT 1998 D. Jeff Dionne
7 * Description: Startup code for Blackfin BF548
10 * Copyright 2004-2007 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 <<<<<<< HEAD:arch/blackfin/mach-bf548/head.S
33 #include <linux/init.h>
34 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:arch/blackfin/mach-bf548/head.S
35 #include <asm/blackfin.h>
36 #include <asm/trace.h>
37 #if CONFIG_BFIN_KERNEL_CLOCK
38 #include <asm/mach-common/clocks.h>
39 #include <asm/mach/mem_init.h>
47 .extern _bf53x_relocate_l1_mem
49 #define INITIAL_STACK 0xFFB01000
51 <<<<<<< HEAD:arch/blackfin/mach-bf548/head.S
55 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:arch/blackfin/mach-bf548/head.S
58 <<<<<<< HEAD:arch/blackfin/mach-bf548/head.S
61 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:arch/blackfin/mach-bf548/head.S
62 /* R0: argument of command line string, passed from uboot, save it */
64 /* Enable Cycle Counter and Nesting Of Interrupts */
65 #ifdef CONFIG_BFIN_SCRATCH_REG_CYCLES
68 R0 = SYSCFG_SNEN | SYSCFG_CCEN;
73 /* Clear Out All the data and pointer Registers*/
95 /* Clear Out All the DAG Registers*/
111 trace_buffer_init(p0,r0);
115 /* Turn off the icache */
116 p0.l = LO(IMEM_CONTROL);
117 p0.h = HI(IMEM_CONTROL);
124 /* Turn off the dcache */
125 p0.l = LO(DMEM_CONTROL);
126 p0.h = HI(DMEM_CONTROL);
133 /* Initialize stack pointer */
134 SP.L = LO(INITIAL_STACK);
135 SP.H = HI(INITIAL_STACK);
139 #ifdef CONFIG_EARLY_PRINTK
141 call _init_early_exception_vectors;
145 /* Put The Code for PLL Programming and SDRAM Programming in L1 ISRAM */
146 call _bf53x_relocate_l1_mem;
147 #if CONFIG_BFIN_KERNEL_CLOCK
148 call _start_dma_code;
150 /* Code for initializing Async memory banks */
152 p2.h = hi(EBIU_AMBCTL1);
153 p2.l = lo(EBIU_AMBCTL1);
154 r0.h = hi(AMBCTL1VAL);
155 r0.l = lo(AMBCTL1VAL);
159 p2.h = hi(EBIU_AMBCTL0);
160 p2.l = lo(EBIU_AMBCTL0);
161 r0.h = hi(AMBCTL0VAL);
162 r0.l = lo(AMBCTL0VAL);
166 p2.h = hi(EBIU_AMGCTL);
167 p2.l = lo(EBIU_AMGCTL);
172 p2.h = hi(EBIU_MBSCTL);
173 p2.l = lo(EBIU_MBSCTL);
174 r0.h = hi(CONFIG_EBIU_MBSCTLVAL);
175 r0.l = lo(CONFIG_EBIU_MBSCTLVAL);
179 p2.h = hi(EBIU_MODE);
180 p2.l = lo(EBIU_MODE);
181 r0.h = hi(CONFIG_EBIU_MODEVAL);
182 r0.l = lo(CONFIG_EBIU_MODEVAL);
186 p2.h = hi(EBIU_FCTL);
187 p2.l = lo(EBIU_FCTL);
188 r0.h = hi(CONFIG_EBIU_FCTLVAL);
189 r0.l = lo(CONFIG_EBIU_FCTLVAL);
193 /* This section keeps the processor in supervisor mode
194 * during kernel boot. Switches to user mode at end of boot.
195 * See page 3-9 of Hardware Reference manual for documentation.
198 /* EVT15 = _real_start */
227 <<<<<<< HEAD:arch/blackfin/mach-bf548/head.S
230 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:arch/blackfin/mach-bf548/head.S
237 w[p0] = r0; /* watchdog off for now */
240 /* Code update for BSS size == 0
241 * Zero out the bss region.
250 lsetup (.L_clear_bss, .L_clear_bss ) lc0 = p2;
254 /* In case there is a NULL pointer reference
255 * Zero out region before stext
265 lsetup (.L_clear_zero, .L_clear_zero ) lc0 = p2;
269 /* pass the uboot arguments to the global value command line */
289 * load the current thread pointer and stack
291 r1.l = _init_thread_union;
292 r1.h = _init_thread_union;
303 <<<<<<< HEAD:arch/blackfin/mach-bf548/head.S
308 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:arch/blackfin/mach-bf548/head.S
311 #if CONFIG_BFIN_KERNEL_CLOCK
312 ENTRY(_start_dma_code)
314 /* Enable PHY CLK buffer output */
331 * - [14:09] = MSEL[5:0] : CLKIN / VCO multiplication factors
332 * - [8] = BYPASS : BYPASS the PLL, run CLKIN into CCLK/SCLK
333 * - [7] = output delay (add 200ps of delay to mem signals)
334 * - [6] = input delay (add 200ps of input delay to mem signals)
335 * - [5] = PDWN : 1=All Clocks off
336 * - [3] = STOPCK : 1=Core Clock off
337 * - [1] = PLL_OFF : 1=Disable Power to PLL
338 * - [0] = DF : 1=Pass CLKIN/2 to PLL / 0=Pass CLKIN to PLL
339 * all other bits set to zero
342 p0.h = hi(PLL_LOCKCNT);
343 p0.l = lo(PLL_LOCKCNT);
348 #if defined(CONFIG_BF54x)
349 P2.H = hi(EBIU_RSTCTL);
350 P2.L = lo(EBIU_RSTCTL);
354 P2.H = hi(EBIU_SDGCTL);
355 P2.L = lo(EBIU_SDGCTL);
361 #if defined(CONFIG_BF54x)
365 if !CC JUMP .LSRR_MODE;
368 r0 = CONFIG_VCO_MULT & 63; /* Load the VCO multiplier */
369 r0 = r0 << 9; /* Shift it over, */
370 r1 = CLKIN_HALF; /* Do we need to divide CLKIN by 2?*/
372 r1 = PLL_BYPASS; /* Bypass the PLL? */
373 r1 = r1 << 8; /* Shift it over */
374 r0 = r1 | r0; /* add them all together */
377 p0.l = lo(PLL_CTL); /* Load the address */
378 cli r2; /* Disable interrupts */
380 w[p0] = r0.l; /* Set the value */
381 idle; /* Wait for the PLL to stablize */
382 sti r2; /* Enable interrupts */
389 if ! CC jump .Lcheck_again;
391 /* Configure SCLK & CCLK Dividers */
392 r0 = (CONFIG_CCLK_ACT_DIV | CONFIG_SCLK_DIV);
398 #if defined(CONFIG_BF54x)
399 P2.H = hi(EBIU_RSTCTL);
400 P2.L = lo(EBIU_RSTCTL);
403 if CC jump .Lskipddrrst;
410 p0.l = lo(EBIU_DDRCTL0);
411 p0.h = hi(EBIU_DDRCTL0);
412 r0.l = lo(mem_DDRCTL0);
413 r0.h = hi(mem_DDRCTL0);
417 p0.l = lo(EBIU_DDRCTL1);
418 p0.h = hi(EBIU_DDRCTL1);
419 r0.l = lo(mem_DDRCTL1);
420 r0.h = hi(mem_DDRCTL1);
424 p0.l = lo(EBIU_DDRCTL2);
425 p0.h = hi(EBIU_DDRCTL2);
426 r0.l = lo(mem_DDRCTL2);
427 r0.h = hi(mem_DDRCTL2);
431 p0.l = lo(EBIU_SDRRC);
432 p0.h = hi(EBIU_SDRRC);
437 p0.l = LO(EBIU_SDBCTL);
438 p0.h = HI(EBIU_SDBCTL); /* SDRAM Memory Bank Control Register */
443 P2.H = hi(EBIU_SDGCTL);
444 P2.L = lo(EBIU_SDGCTL);
447 p0.h = hi(EBIU_SDSTAT);
448 p0.l = lo(EBIU_SDSTAT);
458 R0.L = lo(mem_SDGCTL);
459 R0.H = hi(mem_SDGCTL);
468 r0.l = lo(IWR_ENABLE_ALL);
469 r0.h = hi(IWR_ENABLE_ALL);
474 <<<<<<< HEAD:arch/blackfin/mach-bf548/head.S
476 ENDPROC(_start_dma_code)
477 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:arch/blackfin/mach-bf548/head.S
478 #endif /* CONFIG_BFIN_KERNEL_CLOCK */
483 * Set up the usable of RAM stuff. Size of RAM is determined then
484 * an initial stack set up at the end.