2 * File: arch/blackfin/mach-bf548/head.S
3 * Based on: arch/blackfin/mach-bf537/head.S
4 * Author: Jeff Dionne <jeff@uclinux.org> COPYRIGHT 1998 D. Jeff Dionne
7 * Description: Startup code for Blackfin BF548
10 * Copyright 2004-2007 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 /* Turn off the icache */
102 p0.l = LO(IMEM_CONTROL);
103 p0.h = HI(IMEM_CONTROL);
110 /* Turn off the dcache */
111 p0.l = LO(DMEM_CONTROL);
112 p0.h = HI(DMEM_CONTROL);
119 /* Initialize stack pointer */
120 SP.L = LO(INITIAL_STACK);
121 SP.H = HI(INITIAL_STACK);
125 #ifdef CONFIG_EARLY_PRINTK
127 call _init_early_exception_vectors;
131 /* Put The Code for PLL Programming and SDRAM Programming in L1 ISRAM */
132 call _bf53x_relocate_l1_mem;
133 #ifdef CONFIG_BFIN_KERNEL_CLOCK
134 call _start_dma_code;
137 /* This section keeps the processor in supervisor mode
138 * during kernel boot. Switches to user mode at end of boot.
139 * See page 3-9 of Hardware Reference manual for documentation.
142 /* EVT15 = _real_start */
176 #ifdef CONFIG_BFIN_KERNEL_CLOCK
177 ENTRY(_start_dma_code)
179 /* Enable PHY CLK buffer output */
196 * - [14:09] = MSEL[5:0] : CLKIN / VCO multiplication factors
197 * - [8] = BYPASS : BYPASS the PLL, run CLKIN into CCLK/SCLK
198 * - [7] = output delay (add 200ps of delay to mem signals)
199 * - [6] = input delay (add 200ps of input delay to mem signals)
200 * - [5] = PDWN : 1=All Clocks off
201 * - [3] = STOPCK : 1=Core Clock off
202 * - [1] = PLL_OFF : 1=Disable Power to PLL
203 * - [0] = DF : 1=Pass CLKIN/2 to PLL / 0=Pass CLKIN to PLL
204 * all other bits set to zero
207 p0.h = hi(PLL_LOCKCNT);
208 p0.l = lo(PLL_LOCKCNT);
213 #if defined(CONFIG_BF54x)
214 P2.H = hi(EBIU_RSTCTL);
215 P2.L = lo(EBIU_RSTCTL);
219 P2.H = hi(EBIU_SDGCTL);
220 P2.L = lo(EBIU_SDGCTL);
226 #if defined(CONFIG_BF54x)
230 if !CC JUMP .LSRR_MODE;
233 r0 = CONFIG_VCO_MULT & 63; /* Load the VCO multiplier */
234 r0 = r0 << 9; /* Shift it over, */
235 r1 = CLKIN_HALF; /* Do we need to divide CLKIN by 2?*/
237 r1 = PLL_BYPASS; /* Bypass the PLL? */
238 r1 = r1 << 8; /* Shift it over */
239 r0 = r1 | r0; /* add them all together */
242 p0.l = lo(PLL_CTL); /* Load the address */
243 cli r2; /* Disable interrupts */
245 w[p0] = r0.l; /* Set the value */
246 idle; /* Wait for the PLL to stablize */
247 sti r2; /* Enable interrupts */
254 if ! CC jump .Lcheck_again;
256 /* Configure SCLK & CCLK Dividers */
257 r0 = (CONFIG_CCLK_ACT_DIV | CONFIG_SCLK_DIV);
263 #if defined(CONFIG_BF54x)
264 P2.H = hi(EBIU_RSTCTL);
265 P2.L = lo(EBIU_RSTCTL);
268 if CC jump .Lskipddrrst;
275 p0.l = lo(EBIU_DDRCTL0);
276 p0.h = hi(EBIU_DDRCTL0);
277 r0.l = lo(mem_DDRCTL0);
278 r0.h = hi(mem_DDRCTL0);
282 p0.l = lo(EBIU_DDRCTL1);
283 p0.h = hi(EBIU_DDRCTL1);
284 r0.l = lo(mem_DDRCTL1);
285 r0.h = hi(mem_DDRCTL1);
289 p0.l = lo(EBIU_DDRCTL2);
290 p0.h = hi(EBIU_DDRCTL2);
291 r0.l = lo(mem_DDRCTL2);
292 r0.h = hi(mem_DDRCTL2);
296 p0.l = lo(EBIU_SDRRC);
297 p0.h = hi(EBIU_SDRRC);
302 p0.l = LO(EBIU_SDBCTL);
303 p0.h = HI(EBIU_SDBCTL); /* SDRAM Memory Bank Control Register */
308 P2.H = hi(EBIU_SDGCTL);
309 P2.L = lo(EBIU_SDGCTL);
312 p0.h = hi(EBIU_SDSTAT);
313 p0.l = lo(EBIU_SDSTAT);
323 R0.L = lo(mem_SDGCTL);
324 R0.H = hi(mem_SDGCTL);
333 r0.l = lo(IWR_ENABLE_ALL);
334 r0.h = hi(IWR_ENABLE_ALL);
339 ENDPROC(_start_dma_code)
340 #endif /* CONFIG_BFIN_KERNEL_CLOCK */