Merge branch 'acpica-release-fixes' into release-2.6.27
[cascardo/linux.git] / arch / blackfin / mach-bf561 / head.S
1 /*
2  * File:         arch/blackfin/mach-bf561/head.S
3  * Based on:     arch/blackfin/mach-bf533/head.S
4  * Author:
5  *
6  * Created:
7  * Description:  BF561 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
40 ENTRY(_start_dma_code)
41         p0.h = hi(SICA_IWR0);
42         p0.l = lo(SICA_IWR0);
43         r0.l = 0x1;
44         [p0] = r0;
45         SSYNC;
46
47         /*
48          *  Set PLL_CTL
49          *   - [14:09] = MSEL[5:0] : CLKIN / VCO multiplication factors
50          *   - [8]     = BYPASS    : BYPASS the PLL, run CLKIN into CCLK/SCLK
51          *   - [7]     = output delay (add 200ps of delay to mem signals)
52          *   - [6]     = input delay (add 200ps of input delay to mem signals)
53          *   - [5]     = PDWN      : 1=All Clocks off
54          *   - [3]     = STOPCK    : 1=Core Clock off
55          *   - [1]     = PLL_OFF   : 1=Disable Power to PLL
56          *   - [0]     = DF        : 1=Pass CLKIN/2 to PLL / 0=Pass CLKIN to PLL
57          *   all other bits set to zero
58          */
59
60         p0.h = hi(PLL_LOCKCNT);
61         p0.l = lo(PLL_LOCKCNT);
62         r0 = 0x300(Z);
63         w[p0] = r0.l;
64         ssync;
65
66         P2.H = hi(EBIU_SDGCTL);
67         P2.L = lo(EBIU_SDGCTL);
68         R0 = [P2];
69         BITSET (R0, 24);
70         [P2] = R0;
71         SSYNC;
72
73         r0 = CONFIG_VCO_MULT & 63;       /* Load the VCO multiplier         */
74         r0 = r0 << 9;                    /* Shift it over,                  */
75         r1 = CLKIN_HALF;                 /* Do we need to divide CLKIN by 2?*/
76         r0 = r1 | r0;
77         r1 = PLL_BYPASS;                 /* Bypass the PLL?                 */
78         r1 = r1 << 8;                    /* Shift it over                   */
79         r0 = r1 | r0;                    /* add them all together           */
80
81         p0.h = hi(PLL_CTL);
82         p0.l = lo(PLL_CTL);              /* Load the address                */
83         cli r2;                          /* Disable interrupts              */
84         ssync;
85         w[p0] = r0.l;                    /* Set the value                   */
86         idle;                            /* Wait for the PLL to stablize    */
87         sti r2;                          /* Enable interrupts               */
88
89 .Lcheck_again:
90         p0.h = hi(PLL_STAT);
91         p0.l = lo(PLL_STAT);
92         R0 = W[P0](Z);
93         CC = BITTST(R0,5);
94         if ! CC jump .Lcheck_again;
95
96         /* Configure SCLK & CCLK Dividers */
97         r0 = (CONFIG_CCLK_ACT_DIV | CONFIG_SCLK_DIV);
98         p0.h = hi(PLL_DIV);
99         p0.l = lo(PLL_DIV);
100         w[p0] = r0.l;
101         ssync;
102
103         p0.l = lo(EBIU_SDRRC);
104         p0.h = hi(EBIU_SDRRC);
105         r0 = mem_SDRRC;
106         w[p0] = r0.l;
107         ssync;
108
109         P2.H = hi(EBIU_SDGCTL);
110         P2.L = lo(EBIU_SDGCTL);
111         R0 = [P2];
112         BITCLR (R0, 24);
113         p0.h = hi(EBIU_SDSTAT);
114         p0.l = lo(EBIU_SDSTAT);
115         r2.l = w[p0];
116         cc = bittst(r2,3);
117         if !cc jump .Lskip;
118         NOP;
119         BITSET (R0, 23);
120 .Lskip:
121         [P2] = R0;
122         SSYNC;
123
124         R0.L = lo(mem_SDGCTL);
125         R0.H = hi(mem_SDGCTL);
126         R1 = [p2];
127         R1 = R1 | R0;
128         [P2] = R1;
129         SSYNC;
130
131         RTS;
132 ENDPROC(_start_dma_code)
133 #endif /* CONFIG_BFIN_KERNEL_CLOCK */