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 #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 /* Enable Cycle Counter and Nesting Of Interrupts */
55 #ifdef CONFIG_BFIN_SCRATCH_REG_CYCLES
58 R0 = SYSCFG_SNEN | SYSCFG_CCEN;
63 /* Clear Out All the data and pointer Registers */
85 /* Clear Out All the DAG Registers */
101 trace_buffer_init(p0,r0);
105 /* Turn off the icache */
106 p0.l = LO(IMEM_CONTROL);
107 p0.h = HI(IMEM_CONTROL);
112 /* Anomaly 05000125 */
123 /* Turn off the dcache */
124 p0.l = LO(DMEM_CONTROL);
125 p0.h = HI(DMEM_CONTROL);
130 /* Anomaly 05000125 */
141 /* Initialise General-Purpose I/O Modules on BF537 */
142 /* Rev 0.0 Anomaly 05000212 - PORTx_FER,
143 * PORT_MUX Registers Do Not accept "writes" correctly:
145 p0.h = hi(BFIN_PORT_MUX);
146 p0.l = lo(BFIN_PORT_MUX);
148 R0.L = W[P0]; /* Read */
151 R0 = (PGDE_UART | PFTE_UART)(Z);
153 W[P0] = R0.L; /* Write */
156 W[P0] = R0.L; /* Enable both UARTS */
159 p0.h = hi(PORTF_FER);
160 p0.l = lo(PORTF_FER);
162 R0.L = W[P0]; /* Read */
167 W[P0] = R0.L; /* Write */
170 /* Enable peripheral function of PORTF for UART0 and UART1 */
174 #if !defined(CONFIG_BF534)
175 p0.h = hi(EMAC_SYSTAT);
176 p0.l = lo(EMAC_SYSTAT);
177 R0.h = 0xFFFF; /* Clear EMAC Interrupt Status bits */
183 #ifdef CONFIG_BF537_PORT_H
184 p0.h = hi(PORTH_FER);
185 p0.l = lo(PORTH_FER);
186 R0.L = W[P0]; /* Read */
189 W[P0] = R0.L; /* Write */
191 W[P0] = R0.L; /* Disable peripheral function of PORTH */
195 /* Initialise UART - when booting from u-boot, the UART is not disabled
196 * so if we dont initalize here, our serial console gets hosed */
200 w[p0] = r0.L; /* To enable DLL writes */
215 p0.h = hi(UART_GCTL);
216 p0.l = lo(UART_GCTL);
218 w[p0] = r0.L; /* To enable UART clock */
221 /* Initialize stack pointer */
222 sp.l = lo(INITIAL_STACK);
223 sp.h = hi(INITIAL_STACK);
227 #ifdef CONFIG_EARLY_PRINTK
229 call _init_early_exception_vectors;
233 /* Put The Code for PLL Programming and SDRAM Programming in L1 ISRAM */
234 call _bf53x_relocate_l1_mem;
235 #if CONFIG_BFIN_KERNEL_CLOCK
236 call _start_dma_code;
239 /* Code for initializing Async memory banks */
241 p2.h = hi(EBIU_AMBCTL1);
242 p2.l = lo(EBIU_AMBCTL1);
243 r0.h = hi(AMBCTL1VAL);
244 r0.l = lo(AMBCTL1VAL);
248 p2.h = hi(EBIU_AMBCTL0);
249 p2.l = lo(EBIU_AMBCTL0);
250 r0.h = hi(AMBCTL0VAL);
251 r0.l = lo(AMBCTL0VAL);
255 p2.h = hi(EBIU_AMGCTL);
256 p2.l = lo(EBIU_AMGCTL);
261 /* This section keeps the processor in supervisor mode
262 * during kernel boot. Switches to user mode at end of boot.
263 * See page 3-9 of Hardware Reference manual for documentation.
266 /* EVT15 = _real_start */
300 w[p0] = r0; /* watchdog off for now */
303 /* Code update for BSS size == 0
304 * Zero out the bss region.
313 lsetup (.L_clear_bss, .L_clear_bss) lc0 = p2;
317 /* In case there is a NULL pointer reference
318 * Zero out region before stext
328 lsetup (.L_clear_zero, .L_clear_zero) lc0 = p2;
332 /* pass the uboot arguments to the global value command line */
351 * load the current thread pointer and stack
353 r1.l = _init_thread_union;
354 r1.h = _init_thread_union;
362 jump.l _start_kernel;
368 #if CONFIG_BFIN_KERNEL_CLOCK
369 ENTRY(_start_dma_code)
371 /* Enable PHY CLK buffer output */
388 * - [14:09] = MSEL[5:0] : CLKIN / VCO multiplication factors
389 * - [8] = BYPASS : BYPASS the PLL, run CLKIN into CCLK/SCLK
390 * - [7] = output delay (add 200ps of delay to mem signals)
391 * - [6] = input delay (add 200ps of input delay to mem signals)
392 * - [5] = PDWN : 1=All Clocks off
393 * - [3] = STOPCK : 1=Core Clock off
394 * - [1] = PLL_OFF : 1=Disable Power to PLL
395 * - [0] = DF : 1=Pass CLKIN/2 to PLL / 0=Pass CLKIN to PLL
396 * all other bits set to zero
399 p0.h = hi(PLL_LOCKCNT);
400 p0.l = lo(PLL_LOCKCNT);
405 P2.H = hi(EBIU_SDGCTL);
406 P2.L = lo(EBIU_SDGCTL);
412 r0 = CONFIG_VCO_MULT & 63; /* Load the VCO multiplier */
413 r0 = r0 << 9; /* Shift it over, */
414 r1 = CLKIN_HALF; /* Do we need to divide CLKIN by 2?*/
416 r1 = PLL_BYPASS; /* Bypass the PLL? */
417 r1 = r1 << 8; /* Shift it over */
418 r0 = r1 | r0; /* add them all together */
421 p0.l = lo(PLL_CTL); /* Load the address */
422 cli r2; /* Disable interrupts */
424 w[p0] = r0.l; /* Set the value */
425 idle; /* Wait for the PLL to stablize */
426 sti r2; /* Enable interrupts */
433 if ! CC jump .Lcheck_again;
435 /* Configure SCLK & CCLK Dividers */
436 r0 = (CONFIG_CCLK_ACT_DIV | CONFIG_SCLK_DIV);
442 p0.l = lo(EBIU_SDRRC);
443 p0.h = hi(EBIU_SDRRC);
448 p0.l = LO(EBIU_SDBCTL);
449 p0.h = HI(EBIU_SDBCTL); /* SDRAM Memory Bank Control Register */
454 P2.H = hi(EBIU_SDGCTL);
455 P2.L = lo(EBIU_SDGCTL);
458 p0.h = hi(EBIU_SDSTAT);
459 p0.l = lo(EBIU_SDSTAT);
469 R0.L = lo(mem_SDGCTL);
470 R0.H = hi(mem_SDGCTL);
478 r0.l = lo(IWR_ENABLE_ALL);
479 r0.h = hi(IWR_ENABLE_ALL);
484 ENDPROC(_start_dma_code)
485 #endif /* CONFIG_BFIN_KERNEL_CLOCK */
490 * Set up the usable of RAM stuff. Size of RAM is determined then
491 * an initial stack set up at the end.