2 * File: arch/blackfin/mach-bf527/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 2004-2007 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>
38 .extern _bf53x_relocate_l1_mem
42 ENTRY(_mach_early_start)
43 #if defined(CONFIG_BF527)
44 p0.h = hi(EMAC_SYSTAT);
45 p0.l = lo(EMAC_SYSTAT);
46 R0.h = 0xFFFF; /* Clear EMAC Interrupt Status bits */
52 /* Initialise UART - when booting from u-boot, the UART is not disabled
53 * so if we dont initalize here, our serial console gets hosed */
57 w[p0] = r0.L; /* To enable DLL writes */
72 p0.h = hi(UART1_GCTL);
73 p0.l = lo(UART1_GCTL);
75 w[p0] = r0.L; /* To enable UART clock */
79 ENDPROC(_mach_early_start)
84 #ifdef CONFIG_BFIN_KERNEL_CLOCK
85 ENTRY(_start_dma_code)
87 /* Enable PHY CLK buffer output */
104 * - [14:09] = MSEL[5:0] : CLKIN / VCO multiplication factors
105 * - [8] = BYPASS : BYPASS the PLL, run CLKIN into CCLK/SCLK
106 * - [7] = output delay (add 200ps of delay to mem signals)
107 * - [6] = input delay (add 200ps of input delay to mem signals)
108 * - [5] = PDWN : 1=All Clocks off
109 * - [3] = STOPCK : 1=Core Clock off
110 * - [1] = PLL_OFF : 1=Disable Power to PLL
111 * - [0] = DF : 1=Pass CLKIN/2 to PLL / 0=Pass CLKIN to PLL
112 * all other bits set to zero
115 p0.h = hi(PLL_LOCKCNT);
116 p0.l = lo(PLL_LOCKCNT);
121 P2.H = hi(EBIU_SDGCTL);
122 P2.L = lo(EBIU_SDGCTL);
128 r0 = CONFIG_VCO_MULT & 63; /* Load the VCO multiplier */
129 r0 = r0 << 9; /* Shift it over, */
130 r1 = CLKIN_HALF; /* Do we need to divide CLKIN by 2?*/
132 r1 = PLL_BYPASS; /* Bypass the PLL? */
133 r1 = r1 << 8; /* Shift it over */
134 r0 = r1 | r0; /* add them all together */
137 p0.l = lo(PLL_CTL); /* Load the address */
138 cli r2; /* Disable interrupts */
140 w[p0] = r0.l; /* Set the value */
141 idle; /* Wait for the PLL to stablize */
142 sti r2; /* Enable interrupts */
149 if ! CC jump .Lcheck_again;
151 /* Configure SCLK & CCLK Dividers */
152 r0 = (CONFIG_CCLK_ACT_DIV | CONFIG_SCLK_DIV);
158 p0.l = lo(EBIU_SDRRC);
159 p0.h = hi(EBIU_SDRRC);
164 P2.H = hi(EBIU_SDGCTL);
165 P2.L = lo(EBIU_SDGCTL);
168 p0.h = hi(EBIU_SDSTAT);
169 p0.l = lo(EBIU_SDSTAT);
179 R0.L = lo(mem_SDGCTL);
180 R0.H = hi(mem_SDGCTL);
188 r0.l = lo(IWR_ENABLE_ALL);
189 r0.h = hi(IWR_ENABLE_ALL);
194 ENDPROC(_start_dma_code)
195 #endif /* CONFIG_BFIN_KERNEL_CLOCK */