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 #ifdef CONFIG_BFIN_KERNEL_CLOCK
35 #include <asm/mach-common/clocks.h>
36 #include <asm/mach/mem_init.h>
41 .extern _bf53x_relocate_l1_mem
43 #define INITIAL_STACK 0xFFB01000
48 /* R0: argument of command line string, passed from uboot, save it */
50 /* Enable Cycle Counter and Nesting Of Interrupts */
51 #ifdef CONFIG_BFIN_SCRATCH_REG_CYCLES
54 R0 = SYSCFG_SNEN | SYSCFG_CCEN;
59 /* Clear Out All the data and pointer Registers */
81 /* Clear Out All the DAG Registers */
97 trace_buffer_init(p0,r0);
101 p0.h = hi(FIO_MASKA_C);
102 p0.l = lo(FIO_MASKA_C);
104 w[p0] = r0.L; /* Disable all interrupts */
107 p0.h = hi(FIO_MASKB_C);
108 p0.l = lo(FIO_MASKB_C);
110 w[p0] = r0.L; /* Disable all interrupts */
113 /* Turn off the icache */
114 p0.l = LO(IMEM_CONTROL);
115 p0.h = HI(IMEM_CONTROL);
120 /* Anomaly 05000125 */
131 /* Turn off the dcache */
132 p0.l = LO(DMEM_CONTROL);
133 p0.h = HI(DMEM_CONTROL);
138 /* Anomaly 05000125 */
149 /* Initialise UART - when booting from u-boot, the UART is not disabled
150 * so if we dont initalize here, our serial console gets hosed */
151 p0.h = hi(BFIN_UART_LCR);
152 p0.l = lo(BFIN_UART_LCR);
154 w[p0] = r0.L; /* To enable DLL writes */
157 p0.h = hi(BFIN_UART_DLL);
158 p0.l = lo(BFIN_UART_DLL);
163 p0.h = hi(BFIN_UART_DLH);
164 p0.l = lo(BFIN_UART_DLH);
169 p0.h = hi(BFIN_UART_GCTL);
170 p0.l = lo(BFIN_UART_GCTL);
172 w[p0] = r0.L; /* To enable UART clock */
175 /* Initialize stack pointer */
176 sp.l = lo(INITIAL_STACK);
177 sp.h = hi(INITIAL_STACK);
181 #ifdef CONFIG_EARLY_PRINTK
183 call _init_early_exception_vectors;
187 /* Put The Code for PLL Programming and SDRAM Programming in L1 ISRAM */
188 call _bf53x_relocate_l1_mem;
189 #ifdef CONFIG_BFIN_KERNEL_CLOCK
190 call _start_dma_code;
193 /* Code for initializing Async memory banks */
195 p2.h = hi(EBIU_AMBCTL1);
196 p2.l = lo(EBIU_AMBCTL1);
197 r0.h = hi(AMBCTL1VAL);
198 r0.l = lo(AMBCTL1VAL);
202 p2.h = hi(EBIU_AMBCTL0);
203 p2.l = lo(EBIU_AMBCTL0);
204 r0.h = hi(AMBCTL0VAL);
205 r0.l = lo(AMBCTL0VAL);
209 p2.h = hi(EBIU_AMGCTL);
210 p2.l = lo(EBIU_AMGCTL);
215 /* This section keeps the processor in supervisor mode
216 * during kernel boot. Switches to user mode at end of boot.
217 * See page 3-9 of Hardware Reference manual for documentation.
220 /* EVT15 = _real_start */
254 w[p0] = r0; /* watchdog off for now */
257 /* Code update for BSS size == 0
258 * Zero out the bss region.
267 lsetup (.L_clear_bss, .L_clear_bss) lc0 = p2;
271 /* In case there is a NULL pointer reference
272 * Zero out region before stext
282 lsetup (.L_clear_zero, .L_clear_zero) lc0 = p2;
286 /* pass the uboot arguments to the global value command line */
305 * load the current thread pointer and stack
307 r1.l = _init_thread_union;
308 r1.h = _init_thread_union;
316 jump.l _start_kernel;
322 #ifdef CONFIG_BFIN_KERNEL_CLOCK
323 ENTRY(_start_dma_code)
333 * - [14:09] = MSEL[5:0] : CLKIN / VCO multiplication factors
334 * - [8] = BYPASS : BYPASS the PLL, run CLKIN into CCLK/SCLK
335 * - [7] = output delay (add 200ps of delay to mem signals)
336 * - [6] = input delay (add 200ps of input delay to mem signals)
337 * - [5] = PDWN : 1=All Clocks off
338 * - [3] = STOPCK : 1=Core Clock off
339 * - [1] = PLL_OFF : 1=Disable Power to PLL
340 * - [0] = DF : 1=Pass CLKIN/2 to PLL / 0=Pass CLKIN to PLL
341 * all other bits set to zero
344 p0.h = hi(PLL_LOCKCNT);
345 p0.l = lo(PLL_LOCKCNT);
350 P2.H = hi(EBIU_SDGCTL);
351 P2.L = lo(EBIU_SDGCTL);
357 r0 = CONFIG_VCO_MULT & 63; /* Load the VCO multiplier */
358 r0 = r0 << 9; /* Shift it over, */
359 r1 = CLKIN_HALF; /* Do we need to divide CLKIN by 2?*/
361 r1 = PLL_BYPASS; /* Bypass the PLL? */
362 r1 = r1 << 8; /* Shift it over */
363 r0 = r1 | r0; /* add them all together */
366 p0.l = lo(PLL_CTL); /* Load the address */
367 cli r2; /* Disable interrupts */
369 w[p0] = r0.l; /* Set the value */
370 idle; /* Wait for the PLL to stablize */
371 sti r2; /* Enable interrupts */
378 if ! CC jump .Lcheck_again;
380 /* Configure SCLK & CCLK Dividers */
381 r0 = (CONFIG_CCLK_ACT_DIV | CONFIG_SCLK_DIV);
387 p0.l = lo(EBIU_SDRRC);
388 p0.h = hi(EBIU_SDRRC);
393 P2.H = hi(EBIU_SDGCTL);
394 P2.L = lo(EBIU_SDGCTL);
397 p0.h = hi(EBIU_SDSTAT);
398 p0.l = lo(EBIU_SDSTAT);
408 R0.L = lo(mem_SDGCTL);
409 R0.H = hi(mem_SDGCTL);
417 r0.l = lo(IWR_ENABLE_ALL);
418 r0.h = hi(IWR_ENABLE_ALL);
423 ENDPROC(_start_dma_code)
424 #endif /* CONFIG_BFIN_KERNEL_CLOCK */