[PATCH] Add retain_initrd boot option
[linux-2.6.git] / arch / powerpc / platforms / 52xx / efika-setup.c
1 /*
2  *
3  * Efika 5K2 platform setup
4  * Some code really inspired from the lite5200b platform.
5  * 
6  * Copyright (C) 2006 bplan GmbH
7  *
8  * This file is licensed under the terms of the GNU General Public License
9  * version 2. This program is licensed "as is" without any warranty of any
10  * kind, whether express or implied.
11  *
12  */
13
14 #include <linux/errno.h>
15 #include <linux/kernel.h>
16 #include <linux/slab.h>
17 #include <linux/reboot.h>
18 #include <linux/init.h>
19 #include <linux/utsrelease.h>
20 #include <linux/seq_file.h>
21 #include <linux/root_dev.h>
22 #include <linux/initrd.h>
23 #include <linux/timer.h>
24 #include <linux/pci.h>
25
26 #include <asm/pgtable.h>
27 #include <asm/prom.h>
28 #include <asm/time.h>
29 #include <asm/machdep.h>
30 #include <asm/rtas.h>
31 #include <asm/of_device.h>
32 #include <asm/of_platform.h>
33 #include <asm/mpc52xx.h>
34
35 #include "efika.h"
36
37 static void efika_show_cpuinfo(struct seq_file *m)
38 {
39         struct device_node *root;
40         const char *revision = NULL;
41         const char *codegendescription = NULL;
42         const char *codegenvendor = NULL;
43
44         root = of_find_node_by_path("/");
45         if (root) {
46                 revision = get_property(root, "revision", NULL);
47                 codegendescription =
48                     get_property(root, "CODEGEN,description", NULL);
49                 codegenvendor = get_property(root, "CODEGEN,vendor", NULL);
50
51                 of_node_put(root);
52         }
53
54         if (codegendescription)
55                 seq_printf(m, "machine\t\t: %s\n", codegendescription);
56         else
57                 seq_printf(m, "machine\t\t: Efika\n");
58
59         if (revision)
60                 seq_printf(m, "revision\t: %s\n", revision);
61
62         if (codegenvendor)
63                 seq_printf(m, "vendor\t\t: %s\n", codegenvendor);
64
65         of_node_put(root);
66 }
67
68 static void __init efika_setup_arch(void)
69 {
70         rtas_initialize();
71
72 #ifdef CONFIG_BLK_DEV_INITRD
73         initrd_below_start_ok = 1;
74
75         if (initrd_start)
76                 ROOT_DEV = Root_RAM0;
77         else
78 #endif
79                 ROOT_DEV = Root_SDA2;   /* sda2 (sda1 is for the kernel) */
80
81         efika_pcisetup();
82
83         if (ppc_md.progress)
84                 ppc_md.progress("Linux/PPC " UTS_RELEASE " runnung on Efika ;-)\n", 0x0);
85 }
86
87 static void __init efika_init(void)
88 {
89         struct device_node *np;
90         struct device_node *cnp = NULL;
91         const u32 *base;
92
93         /* Find every child of the SOC node and add it to of_platform */
94         np = of_find_node_by_name(NULL, "builtin");
95         if (np) {
96                 char name[BUS_ID_SIZE];
97                 while ((cnp = of_get_next_child(np, cnp))) {
98                         strcpy(name, cnp->name);
99
100                         base = get_property(cnp, "reg", NULL);
101                         if (base == NULL)
102                                 continue;
103
104                         snprintf(name+strlen(name), BUS_ID_SIZE, "@%x", *base);
105                         of_platform_device_create(cnp, name, NULL);
106
107                         printk(KERN_INFO EFIKA_PLATFORM_NAME" : Added %s (type '%s' at '%s') to the known devices\n", name, cnp->type, cnp->full_name);
108                 }
109         }
110
111         if (ppc_md.progress)
112                 ppc_md.progress("  Have fun with your Efika!    ", 0x7777);
113 }
114
115 static int __init efika_probe(void)
116 {
117         char *model = of_get_flat_dt_prop(of_get_flat_dt_root(),
118                                           "model", NULL);
119
120         if (model == NULL)
121                 return 0;
122         if (strcmp(model, "EFIKA5K2"))
123                 return 0;
124
125         ISA_DMA_THRESHOLD = ~0L;
126         DMA_MODE_READ = 0x44;
127         DMA_MODE_WRITE = 0x48;
128
129         return 1;
130 }
131
132 define_machine(efika)
133 {
134         .name = EFIKA_PLATFORM_NAME,
135         .probe = efika_probe,
136         .setup_arch = efika_setup_arch,
137         .init = efika_init,
138         .show_cpuinfo = efika_show_cpuinfo,
139         .init_IRQ = mpc52xx_init_irq,
140         .get_irq = mpc52xx_get_irq,
141         .restart = rtas_restart,
142         .power_off = rtas_power_off,
143         .halt = rtas_halt,
144         .set_rtc_time = rtas_set_rtc_time,
145         .get_rtc_time = rtas_get_rtc_time,
146         .progress = rtas_progress,
147         .get_boot_time = rtas_get_boot_time,
148         .calibrate_decr = generic_calibrate_decr,
149         .phys_mem_access_prot = pci_phys_mem_access_prot,
150 };