efika.c

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/*
 * 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 <generated/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 = pci_bus_to_host(bus);
    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 = pci_bus_to_host(bus);
    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);
        goto out_put;
    }

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

    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);
    return;
out_put:
    of_node_put(pcictrl);
}

#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();

    /* Map important registers from the internal memory map */
    mpc52xx_map_common_devices();

    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
};