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