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Blackfin arch: unify the duplicated portions of __start and split mach-specific piece...
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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 .extern _bf53x_relocate_l1_mem
39
40 __INIT
41
42 ENTRY(_mach_early_start)
43         /* Initialise UART - when booting from u-boot, the UART is not disabled
44          * so if we dont initalize here, our serial console gets hosed */
45         p0.h = hi(BFIN_UART_LCR);
46         p0.l = lo(BFIN_UART_LCR);
47         r0 = 0x0(Z);
48         w[p0] = r0.L;   /* To enable DLL writes */
49         ssync;
50
51         p0.h = hi(BFIN_UART_DLL);
52         p0.l = lo(BFIN_UART_DLL);
53         r0 = 0x0(Z);
54         w[p0] = r0.L;
55         ssync;
56
57         p0.h = hi(BFIN_UART_DLH);
58         p0.l = lo(BFIN_UART_DLH);
59         r0 = 0x00(Z);
60         w[p0] = r0.L;
61         ssync;
62
63         p0.h = hi(BFIN_UART_GCTL);
64         p0.l = lo(BFIN_UART_GCTL);
65         r0 = 0x0(Z);
66         w[p0] = r0.L;   /* To enable UART clock */
67         ssync;
68
69         rts;
70 ENDPROC(_mach_early_start)
71
72 __FINIT
73
74 .section .l1.text
75 #ifdef CONFIG_BFIN_KERNEL_CLOCK
76 ENTRY(_start_dma_code)
77         p0.h = hi(SICA_IWR0);
78         p0.l = lo(SICA_IWR0);
79         r0.l = 0x1;
80         [p0] = r0;
81         SSYNC;
82
83         /*
84          *  Set PLL_CTL
85          *   - [14:09] = MSEL[5:0] : CLKIN / VCO multiplication factors
86          *   - [8]     = BYPASS    : BYPASS the PLL, run CLKIN into CCLK/SCLK
87          *   - [7]     = output delay (add 200ps of delay to mem signals)
88          *   - [6]     = input delay (add 200ps of input delay to mem signals)
89          *   - [5]     = PDWN      : 1=All Clocks off
90          *   - [3]     = STOPCK    : 1=Core Clock off
91          *   - [1]     = PLL_OFF   : 1=Disable Power to PLL
92          *   - [0]     = DF        : 1=Pass CLKIN/2 to PLL / 0=Pass CLKIN to PLL
93          *   all other bits set to zero
94          */
95
96         p0.h = hi(PLL_LOCKCNT);
97         p0.l = lo(PLL_LOCKCNT);
98         r0 = 0x300(Z);
99         w[p0] = r0.l;
100         ssync;
101
102         P2.H = hi(EBIU_SDGCTL);
103         P2.L = lo(EBIU_SDGCTL);
104         R0 = [P2];
105         BITSET (R0, 24);
106         [P2] = R0;
107         SSYNC;
108
109         r0 = CONFIG_VCO_MULT & 63;       /* Load the VCO multiplier         */
110         r0 = r0 << 9;                    /* Shift it over,                  */
111         r1 = CLKIN_HALF;                 /* Do we need to divide CLKIN by 2?*/
112         r0 = r1 | r0;
113         r1 = PLL_BYPASS;                 /* Bypass the PLL?                 */
114         r1 = r1 << 8;                    /* Shift it over                   */
115         r0 = r1 | r0;                    /* add them all together           */
116
117         p0.h = hi(PLL_CTL);
118         p0.l = lo(PLL_CTL);              /* Load the address                */
119         cli r2;                          /* Disable interrupts              */
120         ssync;
121         w[p0] = r0.l;                    /* Set the value                   */
122         idle;                            /* Wait for the PLL to stablize    */
123         sti r2;                          /* Enable interrupts               */
124
125 .Lcheck_again:
126         p0.h = hi(PLL_STAT);
127         p0.l = lo(PLL_STAT);
128         R0 = W[P0](Z);
129         CC = BITTST(R0,5);
130         if ! CC jump .Lcheck_again;
131
132         /* Configure SCLK & CCLK Dividers */
133         r0 = (CONFIG_CCLK_ACT_DIV | CONFIG_SCLK_DIV);
134         p0.h = hi(PLL_DIV);
135         p0.l = lo(PLL_DIV);
136         w[p0] = r0.l;
137         ssync;
138
139         p0.l = lo(EBIU_SDRRC);
140         p0.h = hi(EBIU_SDRRC);
141         r0 = mem_SDRRC;
142         w[p0] = r0.l;
143         ssync;
144
145         P2.H = hi(EBIU_SDGCTL);
146         P2.L = lo(EBIU_SDGCTL);
147         R0 = [P2];
148         BITCLR (R0, 24);
149         p0.h = hi(EBIU_SDSTAT);
150         p0.l = lo(EBIU_SDSTAT);
151         r2.l = w[p0];
152         cc = bittst(r2,3);
153         if !cc jump .Lskip;
154         NOP;
155         BITSET (R0, 23);
156 .Lskip:
157         [P2] = R0;
158         SSYNC;
159
160         R0.L = lo(mem_SDGCTL);
161         R0.H = hi(mem_SDGCTL);
162         R1 = [p2];
163         R1 = R1 | R0;
164         [P2] = R1;
165         SSYNC;
166
167         RTS;
168 ENDPROC(_start_dma_code)
169 #endif /* CONFIG_BFIN_KERNEL_CLOCK */