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 #if CONFIG_BFIN_KERNEL_CLOCK
34 #include <asm/mach/mem_init.h>
42 .extern _bf53x_relocate_l1_mem
44 #define INITIAL_STACK 0xFFB01000
49 /* R0: argument of command line string, passed from uboot, save it */
51 /* Set the SYSCFG register:
52 * Enable Cycle Counter and Nesting Of Interrupts (3rd Bit)
58 /* Clear Out All the data and pointer Registers */
80 /* Clear Out All the DAG Registers */
96 /* Turn off the icache */
97 p0.l = (IMEM_CONTROL & 0xFFFF);
98 p0.h = (IMEM_CONTROL >> 16);
103 /* Anomaly 05000125 */
104 #ifdef ANOMALY_05000125
110 #ifdef ANOMALY_05000125
114 /* Turn off the dcache */
115 p0.l = (DMEM_CONTROL & 0xFFFF);
116 p0.h = (DMEM_CONTROL >> 16);
121 /* Anomaly 05000125 */
122 #ifdef ANOMALY_05000125
128 #ifdef ANOMALY_05000125
132 /* Initialise UART - when booting from u-boot, the UART is not disabled
133 * so if we dont initalize here, our serial console gets hosed */
137 w[p0] = r0.L; /* To enable DLL writes */
152 p0.h = hi(UART_GCTL);
153 p0.l = lo(UART_GCTL);
155 w[p0] = r0.L; /* To enable UART clock */
158 /* Initialize stack pointer */
159 sp.l = lo(INITIAL_STACK);
160 sp.h = hi(INITIAL_STACK);
164 /* Put The Code for PLL Programming and SDRAM Programming in L1 ISRAM */
165 call _bf53x_relocate_l1_mem;
166 #if CONFIG_BFIN_KERNEL_CLOCK
167 call _start_dma_code;
170 /* Code for initializing Async memory banks */
172 p2.h = hi(EBIU_AMBCTL1);
173 p2.l = lo(EBIU_AMBCTL1);
174 r0.h = hi(AMBCTL1VAL);
175 r0.l = lo(AMBCTL1VAL);
179 p2.h = hi(EBIU_AMBCTL0);
180 p2.l = lo(EBIU_AMBCTL0);
181 r0.h = hi(AMBCTL0VAL);
182 r0.l = lo(AMBCTL0VAL);
186 p2.h = hi(EBIU_AMGCTL);
187 p2.l = lo(EBIU_AMGCTL);
192 /* This section keeps the processor in supervisor mode
193 * during kernel boot. Switches to user mode at end of boot.
194 * See page 3-9 of Hardware Reference manual for documentation.
197 /* EVT15 = _real_start */
217 #if defined(ANOMALY_05000281)
228 p0.l = lo(WDOGA_CTL);
229 p0.h = hi(WDOGA_CTL);
231 w[p0] = r0; /* watchdog off for now */
234 /* Code update for BSS size == 0
235 * Zero out the bss region.
244 lsetup (.L_clear_bss, .L_clear_bss) lc0 = p2;
248 /* In case there is a NULL pointer reference
249 * Zero out region before stext
259 lsetup (.L_clear_zero, .L_clear_zero) lc0 = p2;
263 /* pass the uboot arguments to the global value command line */
282 * load the current thread pointer and stack
284 r1.l = _init_thread_union;
285 r1.h = _init_thread_union;
293 jump.l _start_kernel;
299 #if CONFIG_BFIN_KERNEL_CLOCK
300 ENTRY(_start_dma_code)
301 p0.h = hi(SICA_IWR0);
302 p0.l = lo(SICA_IWR0);
309 * - [14:09] = MSEL[5:0] : CLKIN / VCO multiplication factors
310 * - [8] = BYPASS : BYPASS the PLL, run CLKIN into CCLK/SCLK
311 * - [7] = output delay (add 200ps of delay to mem signals)
312 * - [6] = input delay (add 200ps of input delay to mem signals)
313 * - [5] = PDWN : 1=All Clocks off
314 * - [3] = STOPCK : 1=Core Clock off
315 * - [1] = PLL_OFF : 1=Disable Power to PLL
316 * - [0] = DF : 1=Pass CLKIN/2 to PLL / 0=Pass CLKIN to PLL
317 * all other bits set to zero
320 p0.h = hi(PLL_LOCKCNT);
321 p0.l = lo(PLL_LOCKCNT);
326 P2.H = hi(EBIU_SDGCTL);
327 P2.L = lo(EBIU_SDGCTL);
333 r0 = CONFIG_VCO_MULT & 63; /* Load the VCO multiplier */
334 r0 = r0 << 9; /* Shift it over, */
335 r1 = CLKIN_HALF; /* Do we need to divide CLKIN by 2?*/
337 r1 = PLL_BYPASS; /* Bypass the PLL? */
338 r1 = r1 << 8; /* Shift it over */
339 r0 = r1 | r0; /* add them all together */
342 p0.l = lo(PLL_CTL); /* Load the address */
343 cli r2; /* Disable interrupts */
345 w[p0] = r0.l; /* Set the value */
346 idle; /* Wait for the PLL to stablize */
347 sti r2; /* Enable interrupts */
354 if ! CC jump .Lcheck_again;
356 /* Configure SCLK & CCLK Dividers */
357 r0 = (CONFIG_CCLK_ACT_DIV | CONFIG_SCLK_DIV);
363 p0.l = lo(EBIU_SDRRC);
364 p0.h = hi(EBIU_SDRRC);
369 p0.l = (EBIU_SDBCTL & 0xFFFF);
370 p0.h = (EBIU_SDBCTL >> 16); /* SDRAM Memory Bank Control Register */
375 P2.H = hi(EBIU_SDGCTL);
376 P2.L = lo(EBIU_SDGCTL);
379 p0.h = hi(EBIU_SDSTAT);
380 p0.l = lo(EBIU_SDSTAT);
390 R0.L = lo(mem_SDGCTL);
391 R0.H = hi(mem_SDGCTL);
398 ENDPROC(_start_dma_code)
399 #endif /* CONFIG_BFIN_KERNEL_CLOCK */
402 /* No more interrupts to be handled*/
406 #if defined(CONFIG_BFIN_SHARED_FLASH_ENET)
417 p0.h = hi(FIO_FLAG_C);
418 p0.l = lo(FIO_FLAG_C);
423 /* Clear the IMASK register */
429 /* Clear the ILAT register */
436 /* make sure SYSCR is set to use BMODE */
437 P0.h = hi(SICA_SYSCR);
438 P0.l = lo(SICA_SYSCR);
443 /* issue a system soft reset */
444 P1.h = hi(SICA_SWRST);
445 P1.l = lo(SICA_SWRST);
450 /* clear system soft reset */
455 /* issue core reset */
464 * Set up the usable of RAM stuff. Size of RAM is determined then
465 * an initial stack set up at the end.