Merge branch 'master' of /home/sam/kernel/linux-2.6/
[pandora-kernel.git] / arch / ppc / syslib / ibm44x_common.c
1 /*
2  * PPC44x system library
3  *
4  * Matt Porter <mporter@kernel.crashing.org>
5  * Copyright 2002-2005 MontaVista Software Inc.
6  *
7  * Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
8  * Copyright (c) 2003, 2004 Zultys Technologies
9  *
10  * This program is free software; you can redistribute  it and/or modify it
11  * under  the terms of  the GNU General  Public License as published by the
12  * Free Software Foundation;  either version 2 of the  License, or (at your
13  * option) any later version.
14  *
15  */
16 #include <linux/time.h>
17 #include <linux/types.h>
18 #include <linux/serial.h>
19 #include <linux/module.h>
20 #include <linux/initrd.h>
21
22 #include <asm/ibm44x.h>
23 #include <asm/mmu.h>
24 #include <asm/machdep.h>
25 #include <asm/time.h>
26 #include <asm/ppc4xx_pic.h>
27 #include <asm/param.h>
28 #include <asm/bootinfo.h>
29 #include <asm/ppcboot.h>
30
31 #include <syslib/gen550.h>
32
33 /* Global Variables */
34 bd_t __res;
35
36 phys_addr_t fixup_bigphys_addr(phys_addr_t addr, phys_addr_t size)
37 {
38         phys_addr_t page_4gb = 0;
39
40         /*
41          * Trap the least significant 32-bit portions of an
42          * address in the 440's 36-bit address space.  Fix
43          * them up with the appropriate ERPN
44          */
45         if ((addr >= PPC44x_IO_LO) && (addr <= PPC44x_IO_HI))
46                 page_4gb = PPC44x_IO_PAGE;
47         else if ((addr >= PPC44x_PCI0CFG_LO) && (addr <= PPC44x_PCI0CFG_HI))
48                 page_4gb = PPC44x_PCICFG_PAGE;
49 #ifdef CONFIG_440SP
50         else if ((addr >= PPC44x_PCI1CFG_LO) && (addr <= PPC44x_PCI1CFG_HI))
51                 page_4gb = PPC44x_PCICFG_PAGE;
52         else if ((addr >= PPC44x_PCI2CFG_LO) && (addr <= PPC44x_PCI2CFG_HI))
53                 page_4gb = PPC44x_PCICFG_PAGE;
54 #endif
55         else if ((addr >= PPC44x_PCIMEM_LO) && (addr <= PPC44x_PCIMEM_HI))
56                 page_4gb = PPC44x_PCIMEM_PAGE;
57
58         return (page_4gb | addr);
59 };
60 EXPORT_SYMBOL(fixup_bigphys_addr);
61
62 void __init ibm44x_calibrate_decr(unsigned int freq)
63 {
64         tb_ticks_per_jiffy = freq / HZ;
65         tb_to_us = mulhwu_scale_factor(freq, 1000000);
66
67         /* Set the time base to zero */
68         mtspr(SPRN_TBWL, 0);
69         mtspr(SPRN_TBWU, 0);
70
71         /* Clear any pending timer interrupts */
72         mtspr(SPRN_TSR, TSR_ENW | TSR_WIS | TSR_DIS | TSR_FIS);
73
74         /* Enable decrementer interrupt */
75         mtspr(SPRN_TCR, TCR_DIE);
76 }
77
78 extern void abort(void);
79
80 static void ibm44x_restart(char *cmd)
81 {
82         local_irq_disable();
83         abort();
84 }
85
86 static void ibm44x_power_off(void)
87 {
88         local_irq_disable();
89         for(;;);
90 }
91
92 static void ibm44x_halt(void)
93 {
94         local_irq_disable();
95         for(;;);
96 }
97
98 /*
99  * Read the 44x memory controller to get size of system memory.
100  */
101 static unsigned long __init ibm44x_find_end_of_memory(void)
102 {
103         u32 i, bank_config;
104         u32 mem_size = 0;
105
106         for (i=0; i<4; i++)
107         {
108                 switch (i)
109                 {
110                         case 0:
111                                 mtdcr(DCRN_SDRAM0_CFGADDR, SDRAM0_B0CR);
112                                 break;
113                         case 1:
114                                 mtdcr(DCRN_SDRAM0_CFGADDR, SDRAM0_B1CR);
115                                 break;
116                         case 2:
117                                 mtdcr(DCRN_SDRAM0_CFGADDR, SDRAM0_B2CR);
118                                 break;
119                         case 3:
120                                 mtdcr(DCRN_SDRAM0_CFGADDR, SDRAM0_B3CR);
121                                 break;
122                 }
123
124                 bank_config = mfdcr(DCRN_SDRAM0_CFGDATA);
125
126                 if (!(bank_config & SDRAM_CONFIG_BANK_ENABLE))
127                         continue;
128                 switch (SDRAM_CONFIG_BANK_SIZE(bank_config))
129                 {
130                         case SDRAM_CONFIG_SIZE_8M:
131                                 mem_size += PPC44x_MEM_SIZE_8M;
132                                 break;
133                         case SDRAM_CONFIG_SIZE_16M:
134                                 mem_size += PPC44x_MEM_SIZE_16M;
135                                 break;
136                         case SDRAM_CONFIG_SIZE_32M:
137                                 mem_size += PPC44x_MEM_SIZE_32M;
138                                 break;
139                         case SDRAM_CONFIG_SIZE_64M:
140                                 mem_size += PPC44x_MEM_SIZE_64M;
141                                 break;
142                         case SDRAM_CONFIG_SIZE_128M:
143                                 mem_size += PPC44x_MEM_SIZE_128M;
144                                 break;
145                         case SDRAM_CONFIG_SIZE_256M:
146                                 mem_size += PPC44x_MEM_SIZE_256M;
147                                 break;
148                         case SDRAM_CONFIG_SIZE_512M:
149                                 mem_size += PPC44x_MEM_SIZE_512M;
150                                 break;
151                 }
152         }
153         return mem_size;
154 }
155
156 void __init ibm44x_platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
157                                  unsigned long r6, unsigned long r7)
158 {
159         parse_bootinfo(find_bootinfo());
160
161         /*
162          * If we were passed in a board information, copy it into the
163          * residual data area.
164          */
165         if (r3)
166                 __res = *(bd_t *)(r3 + KERNELBASE);
167
168 #if defined(CONFIG_BLK_DEV_INITRD)
169         /*
170          * If the init RAM disk has been configured in, and there's a valid
171          * starting address for it, set it up.
172          */
173         if (r4) {
174                 initrd_start = r4 + KERNELBASE;
175                 initrd_end = r5 + KERNELBASE;
176         }
177 #endif  /* CONFIG_BLK_DEV_INITRD */
178
179         /* Copy the kernel command line arguments to a safe place. */
180
181         if (r6) {
182                 *(char *) (r7 + KERNELBASE) = 0;
183                 strcpy(cmd_line, (char *) (r6 + KERNELBASE));
184         }
185
186         ppc_md.init_IRQ = ppc4xx_pic_init;
187         ppc_md.find_end_of_memory = ibm44x_find_end_of_memory;
188         ppc_md.restart = ibm44x_restart;
189         ppc_md.power_off = ibm44x_power_off;
190         ppc_md.halt = ibm44x_halt;
191
192 #ifdef CONFIG_SERIAL_TEXT_DEBUG
193         ppc_md.progress = gen550_progress;
194 #endif /* CONFIG_SERIAL_TEXT_DEBUG */
195 #ifdef CONFIG_KGDB
196         ppc_md.kgdb_map_scc = gen550_kgdb_map_scc;
197 #endif
198
199         /*
200          * The Abatron BDI JTAG debugger does not tolerate others
201          * mucking with the debug registers.
202          */
203 #if !defined(CONFIG_BDI_SWITCH)
204         /* Enable internal debug mode */
205         mtspr(SPRN_DBCR0, (DBCR0_IDM));
206
207         /* Clear any residual debug events */
208         mtspr(SPRN_DBSR, 0xffffffff);
209 #endif
210 }
211
212 /* Called from machine_check_exception */
213 void platform_machine_check(struct pt_regs *regs)
214 {
215 #if defined(CONFIG_440SP) || defined(CONFIG_440SPE)
216         printk("PLB0: BEAR=0x%08x%08x ACR=  0x%08x BESR= 0x%08x%08x\n",
217                mfdcr(DCRN_PLB0_BEARH), mfdcr(DCRN_PLB0_BEARL),
218                mfdcr(DCRN_PLB0_ACR), mfdcr(DCRN_PLB0_BESRH),
219                mfdcr(DCRN_PLB0_BESRL));
220         printk("PLB1: BEAR=0x%08x%08x ACR=  0x%08x BESR= 0x%08x%08x\n",
221                mfdcr(DCRN_PLB1_BEARH), mfdcr(DCRN_PLB1_BEARL),
222                mfdcr(DCRN_PLB1_ACR), mfdcr(DCRN_PLB1_BESRH),
223                mfdcr(DCRN_PLB1_BESRL));
224 #else
225         printk("PLB0: BEAR=0x%08x%08x ACR=  0x%08x BESR= 0x%08x\n",
226                 mfdcr(DCRN_PLB0_BEARH), mfdcr(DCRN_PLB0_BEARL),
227                 mfdcr(DCRN_PLB0_ACR),  mfdcr(DCRN_PLB0_BESR));
228 #endif
229         printk("POB0: BEAR=0x%08x%08x BESR0=0x%08x BESR1=0x%08x\n",
230                 mfdcr(DCRN_POB0_BEARH), mfdcr(DCRN_POB0_BEARL),
231                 mfdcr(DCRN_POB0_BESR0), mfdcr(DCRN_POB0_BESR1));
232         printk("OPB0: BEAR=0x%08x%08x BSTAT=0x%08x\n",
233                 mfdcr(DCRN_OPB0_BEARH), mfdcr(DCRN_OPB0_BEARL),
234                 mfdcr(DCRN_OPB0_BSTAT));
235 }