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   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 #include <linux/console.h>
  25
  26 #include <asm/io.h>
  27 #include <asm/irq.h>
  28 #include <asm/sections.h>
  29 #include <asm/pci-bridge.h>
  30 #include <asm/pgtable.h>
  31 #include <asm/prom.h>
  32 #include <asm/time.h>
  33 #include <asm/machdep.h>
  34 #include <asm/rtas.h>
  35 #include <asm/of_device.h>
  36 #include <asm/of_platform.h>
  37 #include <asm/mpc52xx.h>
  38
  39
  40 #define EFIKA_PLATFORM_NAME "Efika"
  41
  42
  43 /* ------------------------------------------------------------------------ */
  44 /* PCI accesses thru RTAS                                                   */
  45 /* ------------------------------------------------------------------------ */
  46
  47 #ifdef CONFIG_PCI
  48
  49 /*
  50  * Access functions for PCI config space using RTAS calls.
  51  */
  52 static int rtas_read_config(struct pci_bus *bus, unsigned int devfn, int offset,
  53                             int len, u32 * val)
  54 {
  55         struct pci_controller *hose = bus->sysdata;
  56         unsigned long addr = (offset & 0xff) | ((devfn & 0xff) << 8)
  57             | (((bus->number - hose->first_busno) & 0xff) << 16)
  58             | (hose->index << 24);
  59         int ret = -1;
  60         int rval;
  61
  62         rval = rtas_call(rtas_token("read-pci-config"), 2, 2, &ret, addr, len);
  63         *val = ret;
  64         return rval ? PCIBIOS_DEVICE_NOT_FOUND : PCIBIOS_SUCCESSFUL;
  65 }
  66
  67 static int rtas_write_config(struct pci_bus *bus, unsigned int devfn,
  68                              int offset, int len, u32 val)
  69 {
  70         struct pci_controller *hose = bus->sysdata;
  71         unsigned long addr = (offset & 0xff) | ((devfn & 0xff) << 8)
  72             | (((bus->number - hose->first_busno) & 0xff) << 16)
  73             | (hose->index << 24);
  74         int rval;
  75
  76         rval = rtas_call(rtas_token("write-pci-config"), 3, 1, NULL,
  77                          addr, len, val);
  78         return rval ? PCIBIOS_DEVICE_NOT_FOUND : PCIBIOS_SUCCESSFUL;
  79 }
  80
  81 static struct pci_ops rtas_pci_ops = {
  82         rtas_read_config,
  83         rtas_write_config
  84 };
  85
  86
  87 void __init efika_pcisetup(void)
  88 {
  89         const int *bus_range;
  90         int len;
  91         struct pci_controller *hose;
  92         struct device_node *root;
  93         struct device_node *pcictrl;
  94
  95         root = of_find_node_by_path("/");
  96         if (root == NULL) {
  97                 printk(KERN_WARNING EFIKA_PLATFORM_NAME
  98                        ": Unable to find the root node\n");
  99                 return;
 100         }
 101
 102         for (pcictrl = NULL;;) {
 103                 pcictrl = of_get_next_child(root, pcictrl);
 104                 if ((pcictrl == NULL) || (strcmp(pcictrl->name, "pci") == 0))
 105                         break;
 106         }
 107
 108         of_node_put(root);
 109
 110         if (pcictrl == NULL) {
 111                 printk(KERN_WARNING EFIKA_PLATFORM_NAME
 112                        ": Unable to find the PCI bridge node\n");
 113                 return;
 114         }
 115
 116         bus_range = of_get_property(pcictrl, "bus-range", &len);
 117         if (bus_range == NULL || len < 2 * sizeof(int)) {
 118                 printk(KERN_WARNING EFIKA_PLATFORM_NAME
 119                        ": Can't get bus-range for %s\n", pcictrl->full_name);
 120                 return;
 121         }
 122
 123         if (bus_range[1] == bus_range[0])
 124                 printk(KERN_INFO EFIKA_PLATFORM_NAME ": PCI bus %d",
 125                        bus_range[0]);
 126         else
 127                 printk(KERN_INFO EFIKA_PLATFORM_NAME ": PCI buses %d..%d",
 128                        bus_range[0], bus_range[1]);
 129         printk(" controlled by %s\n", pcictrl->full_name);
 130         printk("\n");
 131
 132         hose = pcibios_alloc_controller();
 133         if (!hose) {
 134                 printk(KERN_WARNING EFIKA_PLATFORM_NAME
 135                        ": Can't allocate PCI controller structure for %s\n",
 136                        pcictrl->full_name);
 137                 return;
 138         }
 139
 140         hose->arch_data = of_node_get(pcictrl);
 141         hose->first_busno = bus_range[0];
 142         hose->last_busno = bus_range[1];
 143         hose->ops = &rtas_pci_ops;
 144
 145         pci_process_bridge_OF_ranges(hose, pcictrl, 0);
 146 }
 147
 148 #else
 149 void __init efika_pcisetup(void)
 150 {}
 151 #endif
 152
 153
 154
 155 /* ------------------------------------------------------------------------ */
 156 /* Platform setup                                                           */
 157 /* ------------------------------------------------------------------------ */
 158
 159 static void efika_show_cpuinfo(struct seq_file *m)
 160 {
 161         struct device_node *root;
 162         const char *revision;
 163         const char *codegendescription;
 164         const char *codegenvendor;
 165
 166         root = of_find_node_by_path("/");
 167         if (!root)
 168                 return;
 169
 170         revision = of_get_property(root, "revision", NULL);
 171         codegendescription = of_get_property(root, "CODEGEN,description", NULL);
 172         codegenvendor = of_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 static void __init efika_init_early(void)
 225 {
 226 #ifdef CONFIG_SERIAL_MPC52xx
 227         struct device_node *stdout_node;
 228         const char *device_type;
 229
 230         if (strstr(cmd_line, "console="))
 231                 return;
 232         /* find the boot console from /chosen/stdout */
 233         if (!of_chosen)
 234                 return;
 235         device_type = get_property(of_chosen, "linux,stdout-path", NULL);
 236         if (!device_type)
 237                 return;
 238         stdout_node = of_find_node_by_path(device_type);
 239         if (stdout_node) {
 240                 device_type = get_property(stdout_node, "device_type", NULL);
 241                 if (device_type && strcmp(device_type, "serial") == 0)
 242                         add_preferred_console("ttyPSC", 0, NULL);
 243                 of_node_put(stdout_node);
 244         }
 245 #endif
 246 }
 247
 248 define_machine(efika)
 249 {
 250         .name                   = EFIKA_PLATFORM_NAME,
 251         .probe                  = efika_probe,
 252         .setup_arch             = efika_setup_arch,
 253         .init                   = mpc52xx_declare_of_platform_devices,
 254         .init_early             = efika_init_early,
 255         .show_cpuinfo           = efika_show_cpuinfo,
 256         .init_IRQ               = mpc52xx_init_irq,
 257         .get_irq                = mpc52xx_get_irq,
 258         .restart                = rtas_restart,
 259         .power_off              = rtas_power_off,
 260         .halt                   = rtas_halt,
 261         .set_rtc_time           = rtas_set_rtc_time,
 262         .get_rtc_time           = rtas_get_rtc_time,
 263         .progress               = rtas_progress,
 264         .get_boot_time          = rtas_get_boot_time,
 265         .calibrate_decr         = generic_calibrate_decr,
 266         .phys_mem_access_prot   = pci_phys_mem_access_prot,
 267 };
 268