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