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_each_child_of_node(root, pcictrl)
  86                 if (of_node_name_eq(pcictrl, "pci"))
  87                         break;
  88
  89         of_node_put(root);
  90
  91         if (pcictrl == NULL) {
  92                 printk(KERN_WARNING EFIKA_PLATFORM_NAME
  93                        ": Unable to find the PCI bridge node\n");
  94                 return;
  95         }
  96
  97         bus_range = of_get_property(pcictrl, "bus-range", &len);
  98         if (bus_range == NULL || len < 2 * sizeof(int)) {
  99                 printk(KERN_WARNING EFIKA_PLATFORM_NAME
 100                        ": Can't get bus-range for %pOF\n", pcictrl);
 101                 goto out_put;
 102         }
 103
 104         if (bus_range[1] == bus_range[0])
 105                 printk(KERN_INFO EFIKA_PLATFORM_NAME ": PCI bus %d",
 106                        bus_range[0]);
 107         else
 108                 printk(KERN_INFO EFIKA_PLATFORM_NAME ": PCI buses %d..%d",
 109                        bus_range[0], bus_range[1]);
 110         printk(" controlled by %pOF\n", pcictrl);
 111         printk("\n");
 112
 113         hose = pcibios_alloc_controller(pcictrl);
 114         if (!hose) {
 115                 printk(KERN_WARNING EFIKA_PLATFORM_NAME
 116                        ": Can't allocate PCI controller structure for %pOF\n",
 117                        pcictrl);
 118                 goto out_put;
 119         }
 120
 121         hose->first_busno = bus_range[0];
 122         hose->last_busno = bus_range[1];
 123         hose->ops = &rtas_pci_ops;
 124
 125         pci_process_bridge_OF_ranges(hose, pcictrl, 0);
 126         return;
 127 out_put:
 128         of_node_put(pcictrl);
 129 }
 130
 131 #else
 132 static void __init efika_pcisetup(void)
 133 {}
 134 #endif
 135
 136
 137
 138 /* ------------------------------------------------------------------------ */
 139 /* Platform setup                                                           */
 140 /* ------------------------------------------------------------------------ */
 141
 142 static void efika_show_cpuinfo(struct seq_file *m)
 143 {
 144         struct device_node *root;
 145         const char *revision;
 146         const char *codegendescription;
 147         const char *codegenvendor;
 148
 149         root = of_find_node_by_path("/");
 150         if (!root)
 151                 return;
 152
 153         revision = of_get_property(root, "revision", NULL);
 154         codegendescription = of_get_property(root, "CODEGEN,description", NULL);
 155         codegenvendor = of_get_property(root, "CODEGEN,vendor", NULL);
 156
 157         if (codegendescription)
 158                 seq_printf(m, "machine\t\t: %s\n", codegendescription);
 159         else
 160                 seq_printf(m, "machine\t\t: Efika\n");
 161
 162         if (revision)
 163                 seq_printf(m, "revision\t: %s\n", revision);
 164
 165         if (codegenvendor)
 166                 seq_printf(m, "vendor\t\t: %s\n", codegenvendor);
 167
 168         of_node_put(root);
 169 }
 170
 171 #ifdef CONFIG_PM
 172 static void efika_suspend_prepare(void __iomem *mbar)
 173 {
 174         u8 pin = 4;     /* GPIO_WKUP_4 (GPIO_PSC6_0 - IRDA_RX) */
 175         u8 level = 1;   /* wakeup on high level */
 176         /* IOW. to wake it up, short pins 1 and 3 on IRDA connector */
 177         mpc52xx_set_wakeup_gpio(pin, level);
 178 }
 179 #endif
 180
 181 static void __init efika_setup_arch(void)
 182 {
 183         rtas_initialize();
 184
 185         /* Map important registers from the internal memory map */
 186         mpc52xx_map_common_devices();
 187
 188         efika_pcisetup();
 189
 190 #ifdef CONFIG_PM
 191         mpc52xx_suspend.board_suspend_prepare = efika_suspend_prepare;
 192         mpc52xx_pm_init();
 193 #endif
 194
 195         if (ppc_md.progress)
 196                 ppc_md.progress("Linux/PPC " UTS_RELEASE " running on Efika ;-)\n", 0x0);
 197 }
 198
 199 static int __init efika_probe(void)
 200 {
 201         const char *model = of_get_property(of_root, "model", NULL);
 202
 203         if (model == NULL)
 204                 return 0;
 205         if (strcmp(model, "EFIKA5K2"))
 206                 return 0;
 207
 208         DMA_MODE_READ = 0x44;
 209         DMA_MODE_WRITE = 0x48;
 210
 211         pm_power_off = rtas_power_off;
 212
 213         return 1;
 214 }
 215
 216 define_machine(efika)
 217 {
 218         .name                   = EFIKA_PLATFORM_NAME,
 219         .probe                  = efika_probe,
 220         .setup_arch             = efika_setup_arch,
 221         .init                   = mpc52xx_declare_of_platform_devices,
 222         .show_cpuinfo           = efika_show_cpuinfo,
 223         .init_IRQ               = mpc52xx_init_irq,
 224         .get_irq                = mpc52xx_get_irq,
 225         .restart                = rtas_restart,
 226         .halt                   = rtas_halt,
 227         .set_rtc_time           = rtas_set_rtc_time,
 228         .get_rtc_time           = rtas_get_rtc_time,
 229         .progress               = rtas_progress,
 230         .get_boot_time          = rtas_get_boot_time,
 231         .calibrate_decr         = generic_calibrate_decr,
 232 #ifdef CONFIG_PCI
 233         .phys_mem_access_prot   = pci_phys_mem_access_prot,
 234 #endif
 235 };
 236