]> www.pilppa.org Git - linux-2.6-omap-h63xx.git/blob - arch/blackfin/mach-bf527/head.S
Blackfin arch: unify the duplicated portions of __start and split mach-specific piece...
[linux-2.6-omap-h63xx.git] / arch / blackfin / mach-bf527 / head.S
1 /*
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
5  *
6  * Created:      1998
7  * Description:  Startup code for Blackfin BF537
8  *
9  * Modified:
10  *               Copyright 2004-2007 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 #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 */
47         R0.l = 0xFFFF;
48         [P0] = R0;
49         SSYNC;
50 #endif
51
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 */
54         p0.h = hi(UART1_LCR);
55         p0.l = lo(UART1_LCR);
56         r0 = 0x0(Z);
57         w[p0] = r0.L;   /* To enable DLL writes */
58         ssync;
59
60         p0.h = hi(UART1_DLL);
61         p0.l = lo(UART1_DLL);
62         r0 = 0x0(Z);
63         w[p0] = r0.L;
64         ssync;
65
66         p0.h = hi(UART1_DLH);
67         p0.l = lo(UART1_DLH);
68         r0 = 0x00(Z);
69         w[p0] = r0.L;
70         ssync;
71
72         p0.h = hi(UART1_GCTL);
73         p0.l = lo(UART1_GCTL);
74         r0 = 0x0(Z);
75         w[p0] = r0.L;   /* To enable UART clock */
76         ssync;
77
78         rts;
79 ENDPROC(_mach_early_start)
80
81 __FINIT
82
83 .section .l1.text
84 #ifdef CONFIG_BFIN_KERNEL_CLOCK
85 ENTRY(_start_dma_code)
86
87         /* Enable PHY CLK buffer output */
88         p0.h = hi(VR_CTL);
89         p0.l = lo(VR_CTL);
90         r0.l = w[p0];
91         bitset(r0, 14);
92         w[p0] = r0.l;
93         ssync;
94
95         p0.h = hi(SIC_IWR0);
96         p0.l = lo(SIC_IWR0);
97         r0.l = 0x1;
98         r0.h = 0x0;
99         [p0] = r0;
100         SSYNC;
101
102         /*
103          *  Set PLL_CTL
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
113          */
114
115         p0.h = hi(PLL_LOCKCNT);
116         p0.l = lo(PLL_LOCKCNT);
117         r0 = 0x300(Z);
118         w[p0] = r0.l;
119         ssync;
120
121         P2.H = hi(EBIU_SDGCTL);
122         P2.L = lo(EBIU_SDGCTL);
123         R0 = [P2];
124         BITSET (R0, 24);
125         [P2] = R0;
126         SSYNC;
127
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?*/
131         r0 = r1 | r0;
132         r1 = PLL_BYPASS;                 /* Bypass the PLL?                 */
133         r1 = r1 << 8;                    /* Shift it over                   */
134         r0 = r1 | r0;                    /* add them all together           */
135
136         p0.h = hi(PLL_CTL);
137         p0.l = lo(PLL_CTL);              /* Load the address                */
138         cli r2;                          /* Disable interrupts              */
139         ssync;
140         w[p0] = r0.l;                    /* Set the value                   */
141         idle;                            /* Wait for the PLL to stablize    */
142         sti r2;                          /* Enable interrupts               */
143
144 .Lcheck_again:
145         p0.h = hi(PLL_STAT);
146         p0.l = lo(PLL_STAT);
147         R0 = W[P0](Z);
148         CC = BITTST(R0,5);
149         if ! CC jump .Lcheck_again;
150
151         /* Configure SCLK & CCLK Dividers */
152         r0 = (CONFIG_CCLK_ACT_DIV | CONFIG_SCLK_DIV);
153         p0.h = hi(PLL_DIV);
154         p0.l = lo(PLL_DIV);
155         w[p0] = r0.l;
156         ssync;
157
158         p0.l = lo(EBIU_SDRRC);
159         p0.h = hi(EBIU_SDRRC);
160         r0 = mem_SDRRC;
161         w[p0] = r0.l;
162         ssync;
163
164         P2.H = hi(EBIU_SDGCTL);
165         P2.L = lo(EBIU_SDGCTL);
166         R0 = [P2];
167         BITCLR (R0, 24);
168         p0.h = hi(EBIU_SDSTAT);
169         p0.l = lo(EBIU_SDSTAT);
170         r2.l = w[p0];
171         cc = bittst(r2,3);
172         if !cc jump .Lskip;
173         NOP;
174         BITSET (R0, 23);
175 .Lskip:
176         [P2] = R0;
177         SSYNC;
178
179         R0.L = lo(mem_SDGCTL);
180         R0.H = hi(mem_SDGCTL);
181         R1 = [p2];
182         R1 = R1 | R0;
183         [P2] = R1;
184         SSYNC;
185
186         p0.h = hi(SIC_IWR0);
187         p0.l = lo(SIC_IWR0);
188         r0.l = lo(IWR_ENABLE_ALL);
189         r0.h = hi(IWR_ENABLE_ALL);
190         [p0] = r0;
191         SSYNC;
192
193         RTS;
194 ENDPROC(_start_dma_code)
195 #endif /* CONFIG_BFIN_KERNEL_CLOCK */