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 <linux/init.h>
32 #include <asm/blackfin.h>
33 #include <asm/trace.h>
35 #if CONFIG_BFIN_KERNEL_CLOCK
36 #include <asm/mach-common/clocks.h>
37 #include <asm/mach/mem_init.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 trace_buffer_init(p0,r0);
103 /* Turn off the icache */
104 p0.l = LO(IMEM_CONTROL);
105 p0.h = HI(IMEM_CONTROL);
120 /* Turn off the dcache */
121 p0.l = LO(DMEM_CONTROL);
122 p0.h = HI(DMEM_CONTROL);
127 /* Anomaly 05000125 */
138 /* Initialise UART - when booting from u-boot, the UART is not disabled
139 * so if we dont initalize here, our serial console gets hosed */
143 w[p0] = r0.L; /* To enable DLL writes */
158 p0.h = hi(UART_GCTL);
159 p0.l = lo(UART_GCTL);
161 w[p0] = r0.L; /* To enable UART clock */
164 /* Initialize stack pointer */
165 sp.l = lo(INITIAL_STACK);
166 sp.h = hi(INITIAL_STACK);
170 /* Put The Code for PLL Programming and SDRAM Programming in L1 ISRAM */
171 call _bf53x_relocate_l1_mem;
172 #if CONFIG_BFIN_KERNEL_CLOCK
173 call _start_dma_code;
176 /* Code for initializing Async memory banks */
178 p2.h = hi(EBIU_AMBCTL1);
179 p2.l = lo(EBIU_AMBCTL1);
180 r0.h = hi(AMBCTL1VAL);
181 r0.l = lo(AMBCTL1VAL);
185 p2.h = hi(EBIU_AMBCTL0);
186 p2.l = lo(EBIU_AMBCTL0);
187 r0.h = hi(AMBCTL0VAL);
188 r0.l = lo(AMBCTL0VAL);
192 p2.h = hi(EBIU_AMGCTL);
193 p2.l = lo(EBIU_AMGCTL);
198 /* This section keeps the processor in supervisor mode
199 * during kernel boot. Switches to user mode at end of boot.
200 * See page 3-9 of Hardware Reference manual for documentation.
203 /* EVT15 = _real_start */
234 p0.l = lo(WDOGA_CTL);
235 p0.h = hi(WDOGA_CTL);
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 */
288 * load the current thread pointer and stack
290 r1.l = _init_thread_union;
291 r1.h = _init_thread_union;
299 jump.l _start_kernel;
305 #if CONFIG_BFIN_KERNEL_CLOCK
306 ENTRY(_start_dma_code)
307 p0.h = hi(SICA_IWR0);
308 p0.l = lo(SICA_IWR0);
315 * - [14:09] = MSEL[5:0] : CLKIN / VCO multiplication factors
316 * - [8] = BYPASS : BYPASS the PLL, run CLKIN into CCLK/SCLK
317 * - [7] = output delay (add 200ps of delay to mem signals)
318 * - [6] = input delay (add 200ps of input delay to mem signals)
319 * - [5] = PDWN : 1=All Clocks off
320 * - [3] = STOPCK : 1=Core Clock off
321 * - [1] = PLL_OFF : 1=Disable Power to PLL
322 * - [0] = DF : 1=Pass CLKIN/2 to PLL / 0=Pass CLKIN to PLL
323 * all other bits set to zero
326 p0.h = hi(PLL_LOCKCNT);
327 p0.l = lo(PLL_LOCKCNT);
332 P2.H = hi(EBIU_SDGCTL);
333 P2.L = lo(EBIU_SDGCTL);
339 r0 = CONFIG_VCO_MULT & 63; /* Load the VCO multiplier */
340 r0 = r0 << 9; /* Shift it over, */
341 r1 = CLKIN_HALF; /* Do we need to divide CLKIN by 2?*/
343 r1 = PLL_BYPASS; /* Bypass the PLL? */
344 r1 = r1 << 8; /* Shift it over */
345 r0 = r1 | r0; /* add them all together */
348 p0.l = lo(PLL_CTL); /* Load the address */
349 cli r2; /* Disable interrupts */
351 w[p0] = r0.l; /* Set the value */
352 idle; /* Wait for the PLL to stablize */
353 sti r2; /* Enable interrupts */
360 if ! CC jump .Lcheck_again;
362 /* Configure SCLK & CCLK Dividers */
363 r0 = (CONFIG_CCLK_ACT_DIV | CONFIG_SCLK_DIV);
369 p0.l = lo(EBIU_SDRRC);
370 p0.h = hi(EBIU_SDRRC);
375 p0.l = LO(EBIU_SDBCTL);
376 p0.h = HI(EBIU_SDBCTL); /* SDRAM Memory Bank Control Register */
381 P2.H = hi(EBIU_SDGCTL);
382 P2.L = lo(EBIU_SDGCTL);
385 p0.h = hi(EBIU_SDSTAT);
386 p0.l = lo(EBIU_SDSTAT);
396 R0.L = lo(mem_SDGCTL);
397 R0.H = hi(mem_SDGCTL);
404 ENDPROC(_start_dma_code)
405 #endif /* CONFIG_BFIN_KERNEL_CLOCK */
408 /* No more interrupts to be handled*/
412 #if defined(CONFIG_BFIN_SHARED_FLASH_ENET)
423 p0.h = hi(FIO_FLAG_C);
424 p0.l = lo(FIO_FLAG_C);
429 /* Clear the IMASK register */
435 /* Clear the ILAT register */
442 /* make sure SYSCR is set to use BMODE */
445 R0.l = 0x20; /* on BF561, disable core b */
449 /* issue a system soft reset */
456 /* clear system soft reset */
461 /* issue core reset */
470 * Set up the usable of RAM stuff. Size of RAM is determined then
471 * an initial stack set up at the end.