2 * File: arch/blackfin/mach-bf537/head.S
3 * Based on: arch/blackfin/mach-bf533/head.S
4 * Author: Jeff Dionne <jeff@uclinux.org> COPYRIGHT 1998 D. Jeff Dionne
7 * Description: Startup code for Blackfin BF537
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 General-Purpose I/O Modules on BF537 */
133 /* Rev 0.0 Anomaly 05000212 - PORTx_FER,
134 * PORT_MUX Registers Do Not accept "writes" correctly:
136 p0.h = hi(BFIN_PORT_MUX);
137 p0.l = lo(BFIN_PORT_MUX);
138 #ifdef ANOMALY_05000212
139 R0.L = W[P0]; /* Read */
142 R0 = (PGDE_UART | PFTE_UART)(Z);
143 #ifdef ANOMALY_05000212
144 W[P0] = R0.L; /* Write */
147 W[P0] = R0.L; /* Enable both UARTS */
150 p0.h = hi(PORTF_FER);
151 p0.l = lo(PORTF_FER);
152 #ifdef ANOMALY_05000212
153 R0.L = W[P0]; /* Read */
157 #ifdef ANOMALY_05000212
158 W[P0] = R0.L; /* Write */
161 /* Enable peripheral function of PORTF for UART0 and UART1 */
165 #if !defined(CONFIG_BF534)
166 p0.h = hi(EMAC_SYSTAT);
167 p0.l = lo(EMAC_SYSTAT);
168 R0.h = 0xFFFF; /* Clear EMAC Interrupt Status bits */
174 #ifdef CONFIG_BF537_PORT_H
175 p0.h = hi(PORTH_FER);
176 p0.l = lo(PORTH_FER);
177 R0.L = W[P0]; /* Read */
180 W[P0] = R0.L; /* Write */
182 W[P0] = R0.L; /* Disable peripheral function of PORTH */
186 /* Initialise UART - when booting from u-boot, the UART is not disabled
187 * so if we dont initalize here, our serial console gets hosed */
191 w[p0] = r0.L; /* To enable DLL writes */
206 p0.h = hi(UART_GCTL);
207 p0.l = lo(UART_GCTL);
209 w[p0] = r0.L; /* To enable UART clock */
212 /* Initialize stack pointer */
213 sp.l = lo(INITIAL_STACK);
214 sp.h = hi(INITIAL_STACK);
218 /* Put The Code for PLL Programming and SDRAM Programming in L1 ISRAM */
219 call _bf53x_relocate_l1_mem;
220 #if CONFIG_BFIN_KERNEL_CLOCK
221 call _start_dma_code;
224 /* Code for initializing Async memory banks */
226 p2.h = hi(EBIU_AMBCTL1);
227 p2.l = lo(EBIU_AMBCTL1);
228 r0.h = hi(AMBCTL1VAL);
229 r0.l = lo(AMBCTL1VAL);
233 p2.h = hi(EBIU_AMBCTL0);
234 p2.l = lo(EBIU_AMBCTL0);
235 r0.h = hi(AMBCTL0VAL);
236 r0.l = lo(AMBCTL0VAL);
240 p2.h = hi(EBIU_AMGCTL);
241 p2.l = lo(EBIU_AMGCTL);
246 /* This section keeps the processor in supervisor mode
247 * during kernel boot. Switches to user mode at end of boot.
248 * See page 3-9 of Hardware Reference manual for documentation.
251 /* EVT15 = _real_start */
271 #if defined(ANOMALY_05000281)
285 w[p0] = r0; /* watchdog off for now */
288 /* Code update for BSS size == 0
289 * Zero out the bss region.
298 lsetup (.L_clear_bss, .L_clear_bss) lc0 = p2;
302 /* In case there is a NULL pointer reference
303 * Zero out region before stext
313 lsetup (.L_clear_zero, .L_clear_zero) lc0 = p2;
317 /* pass the uboot arguments to the global value command line */
336 * load the current thread pointer and stack
338 r1.l = _init_thread_union;
339 r1.h = _init_thread_union;
347 jump.l _start_kernel;
353 #if CONFIG_BFIN_KERNEL_CLOCK
354 ENTRY(_start_dma_code)
356 /* Enable PHY CLK buffer output */
373 * - [14:09] = MSEL[5:0] : CLKIN / VCO multiplication factors
374 * - [8] = BYPASS : BYPASS the PLL, run CLKIN into CCLK/SCLK
375 * - [7] = output delay (add 200ps of delay to mem signals)
376 * - [6] = input delay (add 200ps of input delay to mem signals)
377 * - [5] = PDWN : 1=All Clocks off
378 * - [3] = STOPCK : 1=Core Clock off
379 * - [1] = PLL_OFF : 1=Disable Power to PLL
380 * - [0] = DF : 1=Pass CLKIN/2 to PLL / 0=Pass CLKIN to PLL
381 * all other bits set to zero
384 p0.h = hi(PLL_LOCKCNT);
385 p0.l = lo(PLL_LOCKCNT);
390 P2.H = hi(EBIU_SDGCTL);
391 P2.L = lo(EBIU_SDGCTL);
397 r0 = CONFIG_VCO_MULT & 63; /* Load the VCO multiplier */
398 r0 = r0 << 9; /* Shift it over, */
399 r1 = CLKIN_HALF; /* Do we need to divide CLKIN by 2?*/
401 r1 = PLL_BYPASS; /* Bypass the PLL? */
402 r1 = r1 << 8; /* Shift it over */
403 r0 = r1 | r0; /* add them all together */
406 p0.l = lo(PLL_CTL); /* Load the address */
407 cli r2; /* Disable interrupts */
409 w[p0] = r0.l; /* Set the value */
410 idle; /* Wait for the PLL to stablize */
411 sti r2; /* Enable interrupts */
418 if ! CC jump .Lcheck_again;
420 /* Configure SCLK & CCLK Dividers */
421 r0 = (CONFIG_CCLK_ACT_DIV | CONFIG_SCLK_DIV);
427 p0.l = lo(EBIU_SDRRC);
428 p0.h = hi(EBIU_SDRRC);
433 p0.l = (EBIU_SDBCTL & 0xFFFF);
434 p0.h = (EBIU_SDBCTL >> 16); /* SDRAM Memory Bank Control Register */
439 P2.H = hi(EBIU_SDGCTL);
440 P2.L = lo(EBIU_SDGCTL);
443 p0.h = hi(EBIU_SDSTAT);
444 p0.l = lo(EBIU_SDSTAT);
454 R0.L = lo(mem_SDGCTL);
455 R0.H = hi(mem_SDGCTL);
463 r0.l = lo(IWR_ENABLE_ALL);
464 r0.h = hi(IWR_ENABLE_ALL);
469 ENDPROC(_start_dma_code)
470 #endif /* CONFIG_BFIN_KERNEL_CLOCK */
473 /* No more interrupts to be handled*/
477 #if defined(CONFIG_MTD_M25P80)
479 * The following code fix the SPI flash reboot issue,
480 * /CS signal of the chip which is using PF10 return to GPIO mode
482 p0.h = hi(PORTF_FER);
483 p0.l = lo(PORTF_FER);
488 /* /CS return to high */
495 /* Delay some time, This is necessary */
499 lsetup (.L_delay_lab1, .L_delay_lab1_end) lc1 = p1;
504 lsetup (.L_delay_lab0, .L_delay_lab0_end) lc0 = p0;
513 /* Clear the IMASK register */
519 /* Clear the ILAT register */
526 /* make sure SYSCR is set to use BMODE */
533 /* issue a system soft reset */
540 /* clear system soft reset */
545 /* issue core reset */
554 * Set up the usable of RAM stuff. Size of RAM is determined then
555 * an initial stack set up at the end.