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1/*
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
5 *
6 * Created: 1998
7 * Description: Startup code for Blackfin BF537
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/clocks.h>
35#include <mach/mem_init.h>
36#endif
37
38.section .l1.text
39#ifdef CONFIG_BFIN_KERNEL_CLOCK
40ENTRY(_start_dma_code)
41
42 /* Enable PHY CLK buffer output */
43 p0.h = hi(VR_CTL);
44 p0.l = lo(VR_CTL);
45 r0.l = w[p0];
46 bitset(r0, 14);
47 w[p0] = r0.l;
48 ssync;
49
50 p0.h = hi(SIC_IWR);
51 p0.l = lo(SIC_IWR);
52 r0.l = 0x1;
53 r0.h = 0x0;
54 [p0] = r0;
55 SSYNC;
56
57 /*
58 * Set PLL_CTL
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
68 */
69
70 p0.h = hi(PLL_LOCKCNT);
71 p0.l = lo(PLL_LOCKCNT);
72 r0 = 0x300(Z);
73 w[p0] = r0.l;
74 ssync;
75
76 P2.H = hi(EBIU_SDGCTL);
77 P2.L = lo(EBIU_SDGCTL);
78 R0 = [P2];
79 BITSET (R0, 24);
80 [P2] = R0;
81 SSYNC;
82
83 r0 = CONFIG_VCO_MULT & 63; /* Load the VCO multiplier */
84 r0 = r0 << 9; /* Shift it over, */
85 r1 = CLKIN_HALF; /* Do we need to divide CLKIN by 2?*/
86 r0 = r1 | r0;
87 r1 = PLL_BYPASS; /* Bypass the PLL? */
88 r1 = r1 << 8; /* Shift it over */
89 r0 = r1 | r0; /* add them all together */
90#ifdef ANOMALY_05000265
91 BITSET(r0, 15); /* Add 250 mV of hysteresis to SPORT input pins */
92#endif
93
94 p0.h = hi(PLL_CTL);
95 p0.l = lo(PLL_CTL); /* Load the address */
96 cli r2; /* Disable interrupts */
97 ssync;
98 w[p0] = r0.l; /* Set the value */
99 idle; /* Wait for the PLL to stablize */
100 sti r2; /* Enable interrupts */
101
102.Lcheck_again:
103 p0.h = hi(PLL_STAT);
104 p0.l = lo(PLL_STAT);
105 R0 = W[P0](Z);
106 CC = BITTST(R0,5);
107 if ! CC jump .Lcheck_again;
108
109 /* Configure SCLK & CCLK Dividers */
110 r0 = (CONFIG_CCLK_ACT_DIV | CONFIG_SCLK_DIV);
111 p0.h = hi(PLL_DIV);
112 p0.l = lo(PLL_DIV);
113 w[p0] = r0.l;
114 ssync;
115
116 p0.l = lo(EBIU_SDRRC);
117 p0.h = hi(EBIU_SDRRC);
118 r0 = mem_SDRRC;
119 w[p0] = r0.l;
120 ssync;
121
122 P2.H = hi(EBIU_SDGCTL);
123 P2.L = lo(EBIU_SDGCTL);
124 R0 = [P2];
125 BITCLR (R0, 24);
126 p0.h = hi(EBIU_SDSTAT);
127 p0.l = lo(EBIU_SDSTAT);
128 r2.l = w[p0];
129 cc = bittst(r2,3);
130 if !cc jump .Lskip;
131 NOP;
132 BITSET (R0, 23);
133.Lskip:
134 [P2] = R0;
135 SSYNC;
136
137 R0.L = lo(mem_SDGCTL);
138 R0.H = hi(mem_SDGCTL);
139 R1 = [p2];
140 R1 = R1 | R0;
141 [P2] = R1;
142 SSYNC;
143
144 RTS;
145ENDPROC(_start_dma_code)
146#endif /* CONFIG_BFIN_KERNEL_CLOCK */