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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-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/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 General-Purpose I/O Modules on BF537 */
44         p0.h = hi(BFIN_PORT_MUX);
45         p0.l = lo(BFIN_PORT_MUX);
46         R0 = (PGDE_UART | PFTE_UART)(Z);
47         W[P0] = R0.L; /* Enable both UARTS */
48         SSYNC;
49
50         /* Enable peripheral function of PORTF for UART0 and UART1 */
51         p0.h = hi(PORTF_FER);
52         p0.l = lo(PORTF_FER);
53         R0 = 0x000F(Z);
54         W[P0] = R0.L;
55         SSYNC;
56
57 #if !defined(CONFIG_BF534)
58         p0.h = hi(EMAC_SYSTAT);
59         p0.l = lo(EMAC_SYSTAT);
60         R0.h = 0xFFFF; /* Clear EMAC Interrupt Status bits */
61         R0.l = 0xFFFF;
62         [P0] = R0;
63         SSYNC;
64 #endif
65
66         /* Initialise UART - when booting from u-boot, the UART is not disabled
67          * so if we dont initalize here, our serial console gets hosed */
68         p0.h = hi(BFIN_UART_LCR);
69         p0.l = lo(BFIN_UART_LCR);
70         r0 = 0x0(Z);
71         w[p0] = r0.L;   /* To enable DLL writes */
72         ssync;
73
74         p0.h = hi(BFIN_UART_DLL);
75         p0.l = lo(BFIN_UART_DLL);
76         r0 = 0x0(Z);
77         w[p0] = r0.L;
78         ssync;
79
80         p0.h = hi(BFIN_UART_DLH);
81         p0.l = lo(BFIN_UART_DLH);
82         r0 = 0x00(Z);
83         w[p0] = r0.L;
84         ssync;
85
86         p0.h = hi(BFIN_UART_GCTL);
87         p0.l = lo(BFIN_UART_GCTL);
88         r0 = 0x0(Z);
89         w[p0] = r0.L;   /* To enable UART clock */
90         ssync;
91
92         rts;
93 ENDPROC(_mach_early_start)
94
95 __FINIT
96
97 .section .l1.text
98 #ifdef CONFIG_BFIN_KERNEL_CLOCK
99 ENTRY(_start_dma_code)
100
101         /* Enable PHY CLK buffer output */
102         p0.h = hi(VR_CTL);
103         p0.l = lo(VR_CTL);
104         r0.l = w[p0];
105         bitset(r0, 14);
106         w[p0] = r0.l;
107         ssync;
108
109         p0.h = hi(SIC_IWR);
110         p0.l = lo(SIC_IWR);
111         r0.l = 0x1;
112         r0.h = 0x0;
113         [p0] = r0;
114         SSYNC;
115
116         /*
117          *  Set PLL_CTL
118          *   - [14:09] = MSEL[5:0] : CLKIN / VCO multiplication factors
119          *   - [8]     = BYPASS    : BYPASS the PLL, run CLKIN into CCLK/SCLK
120          *   - [7]     = output delay (add 200ps of delay to mem signals)
121          *   - [6]     = input delay (add 200ps of input delay to mem signals)
122          *   - [5]     = PDWN      : 1=All Clocks off
123          *   - [3]     = STOPCK    : 1=Core Clock off
124          *   - [1]     = PLL_OFF   : 1=Disable Power to PLL
125          *   - [0]     = DF        : 1=Pass CLKIN/2 to PLL / 0=Pass CLKIN to PLL
126          *   all other bits set to zero
127          */
128
129         p0.h = hi(PLL_LOCKCNT);
130         p0.l = lo(PLL_LOCKCNT);
131         r0 = 0x300(Z);
132         w[p0] = r0.l;
133         ssync;
134
135         P2.H = hi(EBIU_SDGCTL);
136         P2.L = lo(EBIU_SDGCTL);
137         R0 = [P2];
138         BITSET (R0, 24);
139         [P2] = R0;
140         SSYNC;
141
142         r0 = CONFIG_VCO_MULT & 63;       /* Load the VCO multiplier         */
143         r0 = r0 << 9;                    /* Shift it over,                  */
144         r1 = CLKIN_HALF;                 /* Do we need to divide CLKIN by 2?*/
145         r0 = r1 | r0;
146         r1 = PLL_BYPASS;                 /* Bypass the PLL?                 */
147         r1 = r1 << 8;                    /* Shift it over                   */
148         r0 = r1 | r0;                    /* add them all together           */
149
150         p0.h = hi(PLL_CTL);
151         p0.l = lo(PLL_CTL);              /* Load the address                */
152         cli r2;                          /* Disable interrupts              */
153         ssync;
154         w[p0] = r0.l;                    /* Set the value                   */
155         idle;                            /* Wait for the PLL to stablize    */
156         sti r2;                          /* Enable interrupts               */
157
158 .Lcheck_again:
159         p0.h = hi(PLL_STAT);
160         p0.l = lo(PLL_STAT);
161         R0 = W[P0](Z);
162         CC = BITTST(R0,5);
163         if ! CC jump .Lcheck_again;
164
165         /* Configure SCLK & CCLK Dividers */
166         r0 = (CONFIG_CCLK_ACT_DIV | CONFIG_SCLK_DIV);
167         p0.h = hi(PLL_DIV);
168         p0.l = lo(PLL_DIV);
169         w[p0] = r0.l;
170         ssync;
171
172         p0.l = lo(EBIU_SDRRC);
173         p0.h = hi(EBIU_SDRRC);
174         r0 = mem_SDRRC;
175         w[p0] = r0.l;
176         ssync;
177
178         P2.H = hi(EBIU_SDGCTL);
179         P2.L = lo(EBIU_SDGCTL);
180         R0 = [P2];
181         BITCLR (R0, 24);
182         p0.h = hi(EBIU_SDSTAT);
183         p0.l = lo(EBIU_SDSTAT);
184         r2.l = w[p0];
185         cc = bittst(r2,3);
186         if !cc jump .Lskip;
187         NOP;
188         BITSET (R0, 23);
189 .Lskip:
190         [P2] = R0;
191         SSYNC;
192
193         R0.L = lo(mem_SDGCTL);
194         R0.H = hi(mem_SDGCTL);
195         R1 = [p2];
196         R1 = R1 | R0;
197         [P2] = R1;
198         SSYNC;
199
200         p0.h = hi(SIC_IWR);
201         p0.l = lo(SIC_IWR);
202         r0.l = lo(IWR_ENABLE_ALL);
203         r0.h = hi(IWR_ENABLE_ALL);
204         [p0] = r0;
205         SSYNC;
206
207         RTS;
208 ENDPROC(_start_dma_code)
209 #endif /* CONFIG_BFIN_KERNEL_CLOCK */