Merge master.kernel.org:/pub/scm/linux/kernel/git/lethal/sh-2.6
[linux-2.6] / arch / powerpc / platforms / 52xx / efika.c
1 /*
2  * Efika 5K2 platform code
3  * Some code really inspired from the lite5200b platform.
4  *
5  * Copyright (C) 2006 bplan GmbH
6  *
7  * This file is licensed under the terms of the GNU General Public License
8  * version 2. This program is licensed "as is" without any warranty of any
9  * kind, whether express or implied.
10  */
11
12 #include <linux/errno.h>
13 #include <linux/kernel.h>
14 #include <linux/slab.h>
15 #include <linux/reboot.h>
16 #include <linux/init.h>
17 #include <linux/utsrelease.h>
18 #include <linux/seq_file.h>
19 #include <linux/string.h>
20 #include <linux/root_dev.h>
21 #include <linux/initrd.h>
22 #include <linux/timer.h>
23 #include <linux/pci.h>
24
25 #include <asm/io.h>
26 #include <asm/irq.h>
27 #include <asm/sections.h>
28 #include <asm/pci-bridge.h>
29 #include <asm/pgtable.h>
30 #include <asm/prom.h>
31 #include <asm/time.h>
32 #include <asm/machdep.h>
33 #include <asm/rtas.h>
34 #include <asm/of_device.h>
35 #include <asm/of_platform.h>
36 #include <asm/mpc52xx.h>
37
38
39 #define EFIKA_PLATFORM_NAME "Efika"
40
41
42 /* ------------------------------------------------------------------------ */
43 /* PCI accesses thru RTAS                                                   */
44 /* ------------------------------------------------------------------------ */
45
46 #ifdef CONFIG_PCI
47
48 /*
49  * Access functions for PCI config space using RTAS calls.
50  */
51 static int rtas_read_config(struct pci_bus *bus, unsigned int devfn, int offset,
52                             int len, u32 * val)
53 {
54         struct pci_controller *hose = bus->sysdata;
55         unsigned long addr = (offset & 0xff) | ((devfn & 0xff) << 8)
56             | (((bus->number - hose->first_busno) & 0xff) << 16)
57             | (hose->index << 24);
58         int ret = -1;
59         int rval;
60
61         rval = rtas_call(rtas_token("read-pci-config"), 2, 2, &ret, addr, len);
62         *val = ret;
63         return rval ? PCIBIOS_DEVICE_NOT_FOUND : PCIBIOS_SUCCESSFUL;
64 }
65
66 static int rtas_write_config(struct pci_bus *bus, unsigned int devfn,
67                              int offset, int len, u32 val)
68 {
69         struct pci_controller *hose = bus->sysdata;
70         unsigned long addr = (offset & 0xff) | ((devfn & 0xff) << 8)
71             | (((bus->number - hose->first_busno) & 0xff) << 16)
72             | (hose->index << 24);
73         int rval;
74
75         rval = rtas_call(rtas_token("write-pci-config"), 3, 1, NULL,
76                          addr, len, val);
77         return rval ? PCIBIOS_DEVICE_NOT_FOUND : PCIBIOS_SUCCESSFUL;
78 }
79
80 static struct pci_ops rtas_pci_ops = {
81         rtas_read_config,
82         rtas_write_config
83 };
84
85
86 void __init efika_pcisetup(void)
87 {
88         const int *bus_range;
89         int len;
90         struct pci_controller *hose;
91         struct device_node *root;
92         struct device_node *pcictrl;
93
94         root = of_find_node_by_path("/");
95         if (root == NULL) {
96                 printk(KERN_WARNING EFIKA_PLATFORM_NAME
97                        ": Unable to find the root node\n");
98                 return;
99         }
100
101         for (pcictrl = NULL;;) {
102                 pcictrl = of_get_next_child(root, pcictrl);
103                 if ((pcictrl == NULL) || (strcmp(pcictrl->name, "pci") == 0))
104                         break;
105         }
106
107         of_node_put(root);
108
109         if (pcictrl == NULL) {
110                 printk(KERN_WARNING EFIKA_PLATFORM_NAME
111                        ": Unable to find the PCI bridge node\n");
112                 return;
113         }
114
115         bus_range = get_property(pcictrl, "bus-range", &len);
116         if (bus_range == NULL || len < 2 * sizeof(int)) {
117                 printk(KERN_WARNING EFIKA_PLATFORM_NAME
118                        ": Can't get bus-range for %s\n", pcictrl->full_name);
119                 return;
120         }
121
122         if (bus_range[1] == bus_range[0])
123                 printk(KERN_INFO EFIKA_PLATFORM_NAME ": PCI bus %d",
124                        bus_range[0]);
125         else
126                 printk(KERN_INFO EFIKA_PLATFORM_NAME ": PCI buses %d..%d",
127                        bus_range[0], bus_range[1]);
128         printk(" controlled by %s\n", pcictrl->full_name);
129         printk("\n");
130
131         hose = pcibios_alloc_controller();
132         if (!hose) {
133                 printk(KERN_WARNING EFIKA_PLATFORM_NAME
134                        ": Can't allocate PCI controller structure for %s\n",
135                        pcictrl->full_name);
136                 return;
137         }
138
139         hose->arch_data = of_node_get(pcictrl);
140         hose->first_busno = bus_range[0];
141         hose->last_busno = bus_range[1];
142         hose->ops = &rtas_pci_ops;
143
144         pci_process_bridge_OF_ranges(hose, pcictrl, 0);
145 }
146
147 #else
148 void __init efika_pcisetup(void)
149 {}
150 #endif
151
152
153
154 /* ------------------------------------------------------------------------ */
155 /* Platform setup                                                           */
156 /* ------------------------------------------------------------------------ */
157
158 static void efika_show_cpuinfo(struct seq_file *m)
159 {
160         struct device_node *root;
161         const char *revision = NULL;
162         const char *codegendescription = NULL;
163         const char *codegenvendor = NULL;
164
165         root = of_find_node_by_path("/");
166         if (!root)
167                 return;
168
169         revision = get_property(root, "revision", NULL);
170         codegendescription =
171                     get_property(root, "CODEGEN,description", NULL);
172         codegenvendor = get_property(root, "CODEGEN,vendor", NULL);
173
174         if (codegendescription)
175                 seq_printf(m, "machine\t\t: %s\n", codegendescription);
176         else
177                 seq_printf(m, "machine\t\t: Efika\n");
178
179         if (revision)
180                 seq_printf(m, "revision\t: %s\n", revision);
181
182         if (codegenvendor)
183                 seq_printf(m, "vendor\t\t: %s\n", codegenvendor);
184
185         of_node_put(root);
186 }
187
188 static void __init efika_setup_arch(void)
189 {
190         rtas_initialize();
191
192 #ifdef CONFIG_BLK_DEV_INITRD
193         initrd_below_start_ok = 1;
194
195         if (initrd_start)
196                 ROOT_DEV = Root_RAM0;
197         else
198 #endif
199                 ROOT_DEV = Root_SDA2;   /* sda2 (sda1 is for the kernel) */
200
201         efika_pcisetup();
202
203         if (ppc_md.progress)
204                 ppc_md.progress("Linux/PPC " UTS_RELEASE " running on Efika ;-)\n", 0x0);
205 }
206
207 static int __init efika_probe(void)
208 {
209         char *model = of_get_flat_dt_prop(of_get_flat_dt_root(),
210                                           "model", NULL);
211
212         if (model == NULL)
213                 return 0;
214         if (strcmp(model, "EFIKA5K2"))
215                 return 0;
216
217         ISA_DMA_THRESHOLD = ~0L;
218         DMA_MODE_READ = 0x44;
219         DMA_MODE_WRITE = 0x48;
220
221         return 1;
222 }
223
224 define_machine(efika)
225 {
226         .name                   = EFIKA_PLATFORM_NAME,
227         .probe                  = efika_probe,
228         .setup_arch             = efika_setup_arch,
229         .init                   = mpc52xx_declare_of_platform_devices,
230         .show_cpuinfo           = efika_show_cpuinfo,
231         .init_IRQ               = mpc52xx_init_irq,
232         .get_irq                = mpc52xx_get_irq,
233         .restart                = rtas_restart,
234         .power_off              = rtas_power_off,
235         .halt                   = rtas_halt,
236         .set_rtc_time           = rtas_set_rtc_time,
237         .get_rtc_time           = rtas_get_rtc_time,
238         .progress               = rtas_progress,
239         .get_boot_time          = rtas_get_boot_time,
240         .calibrate_decr         = generic_calibrate_decr,
241         .phys_mem_access_prot   = pci_phys_mem_access_prot,
242 };
243