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 #ifdef CONFIG_BFIN_KERNEL_CLOCK
34 #include <asm/mach-common/clocks.h>
35 #include <asm/mach/mem_init.h>
39 #ifdef CONFIG_BFIN_KERNEL_CLOCK
40 ENTRY(_start_dma_code)
42 /* Enable PHY CLK buffer output */
59 * - [14:09] = MSEL[5:0] : CLKIN / VCO multiplication factors
60 * - [8] = BYPASS : BYPASS the PLL, run CLKIN into CCLK/SCLK
61 * - [7] = output delay (add 200ps of delay to mem signals)
62 * - [6] = input delay (add 200ps of input delay to mem signals)
63 * - [5] = PDWN : 1=All Clocks off
64 * - [3] = STOPCK : 1=Core Clock off
65 * - [1] = PLL_OFF : 1=Disable Power to PLL
66 * - [0] = DF : 1=Pass CLKIN/2 to PLL / 0=Pass CLKIN to PLL
67 * all other bits set to zero
70 p0.h = hi(PLL_LOCKCNT);
71 p0.l = lo(PLL_LOCKCNT);
76 #if defined(CONFIG_BF54x)
77 P2.H = hi(EBIU_RSTCTL);
78 P2.L = lo(EBIU_RSTCTL);
82 P2.H = hi(EBIU_SDGCTL);
83 P2.L = lo(EBIU_SDGCTL);
89 #if defined(CONFIG_BF54x)
93 if !CC JUMP .LSRR_MODE;
96 r0 = CONFIG_VCO_MULT & 63; /* Load the VCO multiplier */
97 r0 = r0 << 9; /* Shift it over, */
98 r1 = CLKIN_HALF; /* Do we need to divide CLKIN by 2?*/
100 r1 = PLL_BYPASS; /* Bypass the PLL? */
101 r1 = r1 << 8; /* Shift it over */
102 r0 = r1 | r0; /* add them all together */
105 p0.l = lo(PLL_CTL); /* Load the address */
106 cli r2; /* Disable interrupts */
108 w[p0] = r0.l; /* Set the value */
109 idle; /* Wait for the PLL to stablize */
110 sti r2; /* Enable interrupts */
117 if ! CC jump .Lcheck_again;
119 /* Configure SCLK & CCLK Dividers */
120 r0 = (CONFIG_CCLK_ACT_DIV | CONFIG_SCLK_DIV);
126 #if defined(CONFIG_BF54x)
127 P2.H = hi(EBIU_RSTCTL);
128 P2.L = lo(EBIU_RSTCTL);
131 if CC jump .Lskipddrrst;
138 p0.l = lo(EBIU_DDRCTL0);
139 p0.h = hi(EBIU_DDRCTL0);
140 r0.l = lo(mem_DDRCTL0);
141 r0.h = hi(mem_DDRCTL0);
145 p0.l = lo(EBIU_DDRCTL1);
146 p0.h = hi(EBIU_DDRCTL1);
147 r0.l = lo(mem_DDRCTL1);
148 r0.h = hi(mem_DDRCTL1);
152 p0.l = lo(EBIU_DDRCTL2);
153 p0.h = hi(EBIU_DDRCTL2);
154 r0.l = lo(mem_DDRCTL2);
155 r0.h = hi(mem_DDRCTL2);
159 p0.l = lo(EBIU_SDRRC);
160 p0.h = hi(EBIU_SDRRC);
165 p0.l = LO(EBIU_SDBCTL);
166 p0.h = HI(EBIU_SDBCTL); /* SDRAM Memory Bank Control Register */
171 P2.H = hi(EBIU_SDGCTL);
172 P2.L = lo(EBIU_SDGCTL);
175 p0.h = hi(EBIU_SDSTAT);
176 p0.l = lo(EBIU_SDSTAT);
186 R0.L = lo(mem_SDGCTL);
187 R0.H = hi(mem_SDGCTL);
195 ENDPROC(_start_dma_code)
196 #endif /* CONFIG_BFIN_KERNEL_CLOCK */