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-rw-r--r--arch/blackfin/mach-bf538/head.S137
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1/*
2 * File: arch/blackfin/mach-bf538/head.S
3 * Based on:
4 * Author: Jeff Dionne <jeff@uclinux.org> COPYRIGHT 1998 D. Jeff Dionne
5 *
6 * Created: 1998
7 * Description: bf533 startup file
8 *
9 * Modified:
10 * Copyright 2004-2006 Analog Devices Inc.
11 *
12 * Bugs: Enter bugs at http://blackfin.uclinux.org/
13 *
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.
18 *
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.
23 *
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
28 */
29
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>
36#endif
37
38.section .l1.text
39#ifdef CONFIG_BFIN_KERNEL_CLOCK
40ENTRY(_start_dma_code)
41 p0.h = hi(SIC_IWR0);
42 p0.l = lo(SIC_IWR0);
43 r0.l = 0x1;
44 r0.h = 0x0;
45 [p0] = r0;
46 SSYNC;
47
48 /*
49 * Set PLL_CTL
50 * - [14:09] = MSEL[5:0] : CLKIN / VCO multiplication factors
51 * - [8] = BYPASS : BYPASS the PLL, run CLKIN into CCLK/SCLK
52 * - [7] = output delay (add 200ps of delay to mem signals)
53 * - [6] = input delay (add 200ps of input delay to mem signals)
54 * - [5] = PDWN : 1=All Clocks off
55 * - [3] = STOPCK : 1=Core Clock off
56 * - [1] = PLL_OFF : 1=Disable Power to PLL
57 * - [0] = DF : 1=Pass CLKIN/2 to PLL / 0=Pass CLKIN to PLL
58 * all other bits set to zero
59 */
60
61 p0.h = hi(PLL_LOCKCNT);
62 p0.l = lo(PLL_LOCKCNT);
63 r0 = 0x300(Z);
64 w[p0] = r0.l;
65 ssync;
66
67 P2.H = hi(EBIU_SDGCTL);
68 P2.L = lo(EBIU_SDGCTL);
69 R0 = [P2];
70 BITSET (R0, 24);
71 [P2] = R0;
72 SSYNC;
73
74 r0 = CONFIG_VCO_MULT & 63; /* Load the VCO multiplier */
75 r0 = r0 << 9; /* Shift it over, */
76 r1 = CLKIN_HALF; /* Do we need to divide CLKIN by 2?*/
77 r0 = r1 | r0;
78 r1 = PLL_BYPASS; /* Bypass the PLL? */
79 r1 = r1 << 8; /* Shift it over */
80 r0 = r1 | r0; /* add them all together */
81#ifdef ANOMALY_05000265
82 BITSET(r0, 15); /* Add 250 mV of hysteresis to SPORT input pins */
83#endif
84
85 p0.h = hi(PLL_CTL);
86 p0.l = lo(PLL_CTL); /* Load the address */
87 cli r2; /* Disable interrupts */
88 ssync;
89 w[p0] = r0.l; /* Set the value */
90 idle; /* Wait for the PLL to stablize */
91 sti r2; /* Enable interrupts */
92
93.Lcheck_again:
94 p0.h = hi(PLL_STAT);
95 p0.l = lo(PLL_STAT);
96 R0 = W[P0](Z);
97 CC = BITTST(R0,5);
98 if ! CC jump .Lcheck_again;
99
100 /* Configure SCLK & CCLK Dividers */
101 r0 = (CONFIG_CCLK_ACT_DIV | CONFIG_SCLK_DIV);
102 p0.h = hi(PLL_DIV);
103 p0.l = lo(PLL_DIV);
104 w[p0] = r0.l;
105 ssync;
106
107 p0.l = lo(EBIU_SDRRC);
108 p0.h = hi(EBIU_SDRRC);
109 r0 = mem_SDRRC;
110 w[p0] = r0.l;
111 ssync;
112
113 P2.H = hi(EBIU_SDGCTL);
114 P2.L = lo(EBIU_SDGCTL);
115 R0 = [P2];
116 BITCLR (R0, 24);
117 p0.h = hi(EBIU_SDSTAT);
118 p0.l = lo(EBIU_SDSTAT);
119 r2.l = w[p0];
120 cc = bittst(r2,3);
121 if !cc jump .Lskip;
122 NOP;
123 BITSET (R0, 23);
124.Lskip:
125 [P2] = R0;
126 SSYNC;
127
128 R0.L = lo(mem_SDGCTL);
129 R0.H = hi(mem_SDGCTL);
130 R1 = [p2];
131 R1 = R1 | R0;
132 [P2] = R1;
133 SSYNC;
134
135 RTS;
136ENDPROC(_start_dma_code)
137#endif /* CONFIG_BFIN_KERNEL_CLOCK */