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/init.h>
  13 #include <generated/utsrelease.h>
  14 #include <linux/pci.h>
  15 #include <linux/of.h>
  16 #include <asm/dma.h>
  17 #include <asm/prom.h>
  18 #include <asm/time.h>
  19 #include <asm/machdep.h>
  20 #include <asm/rtas.h>
  21 #include <asm/mpc52xx.h>
  22
  23 #define EFIKA_PLATFORM_NAME "Efika"
  24
  25
  26 /* ------------------------------------------------------------------------ */
  27 /* PCI accesses thru RTAS                                                   */
  28 /* ------------------------------------------------------------------------ */
  29
  30 #ifdef CONFIG_PCI
  31
  32 /*
  33  * Access functions for PCI config space using RTAS calls.
  34  */
  35 static int rtas_read_config(struct pci_bus *bus, unsigned int devfn, int offset,
  36                             int len, u32 * val)
  37 {
  38         struct pci_controller *hose = pci_bus_to_host(bus);
  39         unsigned long addr = (offset & 0xff) | ((devfn & 0xff) << 8)
  40             | (((bus->number - hose->first_busno) & 0xff) << 16)
  41             | (hose->global_number << 24);
  42         int ret = -1;
  43         int rval;
  44
  45         rval = rtas_call(rtas_token("read-pci-config"), 2, 2, &ret, addr, len);
  46         *val = ret;
  47         return rval ? PCIBIOS_DEVICE_NOT_FOUND : PCIBIOS_SUCCESSFUL;
  48 }
  49
  50 static int rtas_write_config(struct pci_bus *bus, unsigned int devfn,
  51                              int offset, int len, u32 val)
  52 {
  53         struct pci_controller *hose = pci_bus_to_host(bus);
  54         unsigned long addr = (offset & 0xff) | ((devfn & 0xff) << 8)
  55             | (((bus->number - hose->first_busno) & 0xff) << 16)
  56             | (hose->global_number << 24);
  57         int rval;
  58
  59         rval = rtas_call(rtas_token("write-pci-config"), 3, 1, NULL,
  60                          addr, len, val);
  61         return rval ? PCIBIOS_DEVICE_NOT_FOUND : PCIBIOS_SUCCESSFUL;
  62 }
  63
  64 static struct pci_ops rtas_pci_ops = {
  65         .read = rtas_read_config,
  66         .write = rtas_write_config,
  67 };
  68
  69
  70 static void __init efika_pcisetup(void)
  71 {
  72         const int *bus_range;
  73         int len;
  74         struct pci_controller *hose;
  75         struct device_node *root;
  76         struct device_node *pcictrl;
  77
  78         root = of_find_node_by_path("/");
  79         if (root == NULL) {
  80                 printk(KERN_WARNING EFIKA_PLATFORM_NAME
  81                        ": Unable to find the root node\n");
  82                 return;
  83         }
  84
  85         for (pcictrl = NULL;;) {
  86                 pcictrl = of_get_next_child(root, pcictrl);
  87                 if ((pcictrl == NULL) || (strcmp(pcictrl->name, "pci") == 0))
  88                         break;
  89         }
  90
  91         of_node_put(root);
  92
  93         if (pcictrl == NULL) {
  94                 printk(KERN_WARNING EFIKA_PLATFORM_NAME
  95                        ": Unable to find the PCI bridge node\n");
  96                 return;
  97         }
  98
  99         bus_range = of_get_property(pcictrl, "bus-range", &len);
 100         if (bus_range == NULL || len < 2 * sizeof(int)) {
 101                 printk(KERN_WARNING EFIKA_PLATFORM_NAME
 102                        ": Can't get bus-range for %s\n", pcictrl->full_name);
 103                 goto out_put;
 104         }
 105
 106         if (bus_range[1] == bus_range[0])
 107                 printk(KERN_INFO EFIKA_PLATFORM_NAME ": PCI bus %d",
 108                        bus_range[0]);
 109         else
 110                 printk(KERN_INFO EFIKA_PLATFORM_NAME ": PCI buses %d..%d",
 111                        bus_range[0], bus_range[1]);
 112         printk(" controlled by %s\n", pcictrl->full_name);
 113         printk("\n");
 114
 115         hose = pcibios_alloc_controller(pcictrl);
 116         if (!hose) {
 117                 printk(KERN_WARNING EFIKA_PLATFORM_NAME
 118                        ": Can't allocate PCI controller structure for %s\n",
 119                        pcictrl->full_name);
 120                 goto out_put;
 121         }
 122
 123         hose->first_busno = bus_range[0];
 124         hose->last_busno = bus_range[1];
 125         hose->ops = &rtas_pci_ops;
 126
 127         pci_process_bridge_OF_ranges(hose, pcictrl, 0);
 128         return;
 129 out_put:
 130         of_node_put(pcictrl);
 131 }
 132
 133 #else
 134 static void __init efika_pcisetup(void)
 135 {}
 136 #endif
 137
 138
 139
 140 /* ------------------------------------------------------------------------ */
 141 /* Platform setup                                                           */
 142 /* ------------------------------------------------------------------------ */
 143
 144 static void efika_show_cpuinfo(struct seq_file *m)
 145 {
 146         struct device_node *root;
 147         const char *revision;
 148         const char *codegendescription;
 149         const char *codegenvendor;
 150
 151         root = of_find_node_by_path("/");
 152         if (!root)
 153                 return;
 154
 155         revision = of_get_property(root, "revision", NULL);
 156         codegendescription = of_get_property(root, "CODEGEN,description", NULL);
 157         codegenvendor = of_get_property(root, "CODEGEN,vendor", NULL);
 158
 159         if (codegendescription)
 160                 seq_printf(m, "machine\t\t: %s\n", codegendescription);
 161         else
 162                 seq_printf(m, "machine\t\t: Efika\n");
 163
 164         if (revision)
 165                 seq_printf(m, "revision\t: %s\n", revision);
 166
 167         if (codegenvendor)
 168                 seq_printf(m, "vendor\t\t: %s\n", codegenvendor);
 169
 170         of_node_put(root);
 171 }
 172
 173 #ifdef CONFIG_PM
 174 static void efika_suspend_prepare(void __iomem *mbar)
 175 {
 176         u8 pin = 4;     /* GPIO_WKUP_4 (GPIO_PSC6_0 - IRDA_RX) */
 177         u8 level = 1;   /* wakeup on high level */
 178         /* IOW. to wake it up, short pins 1 and 3 on IRDA connector */
 179         mpc52xx_set_wakeup_gpio(pin, level);
 180 }
 181 #endif
 182
 183 static void __init efika_setup_arch(void)
 184 {
 185         rtas_initialize();
 186
 187         /* Map important registers from the internal memory map */
 188         mpc52xx_map_common_devices();
 189
 190         efika_pcisetup();
 191
 192 #ifdef CONFIG_PM
 193         mpc52xx_suspend.board_suspend_prepare = efika_suspend_prepare;
 194         mpc52xx_pm_init();
 195 #endif
 196
 197         if (ppc_md.progress)
 198                 ppc_md.progress("Linux/PPC " UTS_RELEASE " running on Efika ;-)\n", 0x0);
 199 }
 200
 201 static int __init efika_probe(void)
 202 {
 203         const char *model = of_get_flat_dt_prop(of_get_flat_dt_root(),
 204                                                 "model", NULL);
 205
 206         if (model == NULL)
 207                 return 0;
 208         if (strcmp(model, "EFIKA5K2"))
 209                 return 0;
 210
 211         ISA_DMA_THRESHOLD = ~0L;
 212         DMA_MODE_READ = 0x44;
 213         DMA_MODE_WRITE = 0x48;
 214
 215         pm_power_off = rtas_power_off;
 216
 217         return 1;
 218 }
 219
 220 define_machine(efika)
 221 {
 222         .name                   = EFIKA_PLATFORM_NAME,
 223         .probe                  = efika_probe,
 224         .setup_arch             = efika_setup_arch,
 225         .init                   = mpc52xx_declare_of_platform_devices,
 226         .show_cpuinfo           = efika_show_cpuinfo,
 227         .init_IRQ               = mpc52xx_init_irq,
 228         .get_irq                = mpc52xx_get_irq,
 229         .restart                = rtas_restart,
 230         .halt                   = rtas_halt,
 231         .set_rtc_time           = rtas_set_rtc_time,
 232         .get_rtc_time           = rtas_get_rtc_time,
 233         .progress               = rtas_progress,
 234         .get_boot_time          = rtas_get_boot_time,
 235         .calibrate_decr         = generic_calibrate_decr,
 236 #ifdef CONFIG_PCI
 237         .phys_mem_access_prot   = pci_phys_mem_access_prot,
 238 #endif
 239 };
 240