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efika.c

/*
 * Efika 5K2 platform code
 * Some code really inspired from the lite5200b platform.
 *
 * Copyright (C) 2006 bplan GmbH
 *
 * This file is licensed under the terms of the GNU General Public License
 * version 2. This program is licensed "as is" without any warranty of any
 * kind, whether express or implied.
 */

#include <linux/init.h>
#include <linux/utsrelease.h>
#include <linux/pci.h>
#include <linux/of.h>
#include <asm/prom.h>
#include <asm/time.h>
#include <asm/machdep.h>
#include <asm/rtas.h>
#include <asm/mpc52xx.h>

#define EFIKA_PLATFORM_NAME "Efika"


/* ------------------------------------------------------------------------ */
/* PCI accesses thru RTAS                                                   */
/* ------------------------------------------------------------------------ */

#ifdef CONFIG_PCI

/*
 * Access functions for PCI config space using RTAS calls.
 */
static int rtas_read_config(struct pci_bus *bus, unsigned int devfn, int offset,
                      int len, u32 * val)
{
      struct pci_controller *hose = bus->sysdata;
      unsigned long addr = (offset & 0xff) | ((devfn & 0xff) << 8)
          | (((bus->number - hose->first_busno) & 0xff) << 16)
          | (hose->global_number << 24);
      int ret = -1;
      int rval;

      rval = rtas_call(rtas_token("read-pci-config"), 2, 2, &ret, addr, len);
      *val = ret;
      return rval ? PCIBIOS_DEVICE_NOT_FOUND : PCIBIOS_SUCCESSFUL;
}

static int rtas_write_config(struct pci_bus *bus, unsigned int devfn,
                       int offset, int len, u32 val)
{
      struct pci_controller *hose = bus->sysdata;
      unsigned long addr = (offset & 0xff) | ((devfn & 0xff) << 8)
          | (((bus->number - hose->first_busno) & 0xff) << 16)
          | (hose->global_number << 24);
      int rval;

      rval = rtas_call(rtas_token("write-pci-config"), 3, 1, NULL,
                   addr, len, val);
      return rval ? PCIBIOS_DEVICE_NOT_FOUND : PCIBIOS_SUCCESSFUL;
}

static struct pci_ops rtas_pci_ops = {
      .read = rtas_read_config,
      .write = rtas_write_config,
};


static void __init efika_pcisetup(void)
{
      const int *bus_range;
      int len;
      struct pci_controller *hose;
      struct device_node *root;
      struct device_node *pcictrl;

      root = of_find_node_by_path("/");
      if (root == NULL) {
            printk(KERN_WARNING EFIKA_PLATFORM_NAME
                   ": Unable to find the root node\n");
            return;
      }

      for (pcictrl = NULL;;) {
            pcictrl = of_get_next_child(root, pcictrl);
            if ((pcictrl == NULL) || (strcmp(pcictrl->name, "pci") == 0))
                  break;
      }

      of_node_put(root);

      if (pcictrl == NULL) {
            printk(KERN_WARNING EFIKA_PLATFORM_NAME
                   ": Unable to find the PCI bridge node\n");
            return;
      }

      bus_range = of_get_property(pcictrl, "bus-range", &len);
      if (bus_range == NULL || len < 2 * sizeof(int)) {
            printk(KERN_WARNING EFIKA_PLATFORM_NAME
                   ": Can't get bus-range for %s\n", pcictrl->full_name);
            return;
      }

      if (bus_range[1] == bus_range[0])
            printk(KERN_INFO EFIKA_PLATFORM_NAME ": PCI bus %d",
                   bus_range[0]);
      else
            printk(KERN_INFO EFIKA_PLATFORM_NAME ": PCI buses %d..%d",
                   bus_range[0], bus_range[1]);
      printk(" controlled by %s\n", pcictrl->full_name);
      printk("\n");

      hose = pcibios_alloc_controller(of_node_get(pcictrl));
      if (!hose) {
            printk(KERN_WARNING EFIKA_PLATFORM_NAME
                   ": Can't allocate PCI controller structure for %s\n",
                   pcictrl->full_name);
            return;
      }

      hose->first_busno = bus_range[0];
      hose->last_busno = bus_range[1];
      hose->ops = &rtas_pci_ops;

      pci_process_bridge_OF_ranges(hose, pcictrl, 0);
}

#else
static void __init efika_pcisetup(void)
{}
#endif



/* ------------------------------------------------------------------------ */
/* Platform setup                                                           */
/* ------------------------------------------------------------------------ */

static void efika_show_cpuinfo(struct seq_file *m)
{
      struct device_node *root;
      const char *revision;
      const char *codegendescription;
      const char *codegenvendor;

      root = of_find_node_by_path("/");
      if (!root)
            return;

      revision = of_get_property(root, "revision", NULL);
      codegendescription = of_get_property(root, "CODEGEN,description", NULL);
      codegenvendor = of_get_property(root, "CODEGEN,vendor", NULL);

      if (codegendescription)
            seq_printf(m, "machine\t\t: %s\n", codegendescription);
      else
            seq_printf(m, "machine\t\t: Efika\n");

      if (revision)
            seq_printf(m, "revision\t: %s\n", revision);

      if (codegenvendor)
            seq_printf(m, "vendor\t\t: %s\n", codegenvendor);

      of_node_put(root);
}

#ifdef CONFIG_PM
static void efika_suspend_prepare(void __iomem *mbar)
{
      u8 pin = 4; /* GPIO_WKUP_4 (GPIO_PSC6_0 - IRDA_RX) */
      u8 level = 1;     /* wakeup on high level */
      /* IOW. to wake it up, short pins 1 and 3 on IRDA connector */
      mpc52xx_set_wakeup_gpio(pin, level);
}
#endif

static void __init efika_setup_arch(void)
{
      rtas_initialize();

      efika_pcisetup();

#ifdef CONFIG_PM
      mpc52xx_suspend.board_suspend_prepare = efika_suspend_prepare;
      mpc52xx_pm_init();
#endif

      if (ppc_md.progress)
            ppc_md.progress("Linux/PPC " UTS_RELEASE " running on Efika ;-)\n", 0x0);
}

static int __init efika_probe(void)
{
      char *model = of_get_flat_dt_prop(of_get_flat_dt_root(),
                                "model", NULL);

      if (model == NULL)
            return 0;
      if (strcmp(model, "EFIKA5K2"))
            return 0;

      ISA_DMA_THRESHOLD = ~0L;
      DMA_MODE_READ = 0x44;
      DMA_MODE_WRITE = 0x48;

      return 1;
}

define_machine(efika)
{
      .name             = EFIKA_PLATFORM_NAME,
      .probe                  = efika_probe,
      .setup_arch       = efika_setup_arch,
      .init             = mpc52xx_declare_of_platform_devices,
      .show_cpuinfo           = efika_show_cpuinfo,
      .init_IRQ         = mpc52xx_init_irq,
      .get_irq          = mpc52xx_get_irq,
      .restart          = rtas_restart,
      .power_off        = rtas_power_off,
      .halt             = rtas_halt,
      .set_rtc_time           = rtas_set_rtc_time,
      .get_rtc_time           = rtas_get_rtc_time,
      .progress         = rtas_progress,
      .get_boot_time          = rtas_get_boot_time,
      .calibrate_decr         = generic_calibrate_decr,
#ifdef CONFIG_PCI
      .phys_mem_access_prot   = pci_phys_mem_access_prot,
#endif
};


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