common.c

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/*
 * Code commons to all DaVinci SoCs.
 *
 * Author: Mark A. Greer <[email protected]>
 *
 * 2009 (c) MontaVista Software, Inc. 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/module.h>
#include <linux/io.h>
#include <linux/etherdevice.h>
#include <linux/davinci_emac.h>
#include <linux/dma-mapping.h>

#include <asm/tlb.h>
#include <asm/mach/map.h>

#include <mach/common.h>
#include <mach/cputype.h>

#include "clock.h"

struct davinci_soc_info davinci_soc_info;
EXPORT_SYMBOL(davinci_soc_info);

void __iomem *davinci_intc_base;
int davinci_intc_type;

void davinci_get_mac_addr(struct memory_accessor *mem_acc, void *context)
{
    char *mac_addr = davinci_soc_info.emac_pdata->mac_addr;
    off_t offset = (off_t)context;

    /* Read MAC addr from EEPROM */
    if (mem_acc->read(mem_acc, mac_addr, offset, ETH_ALEN) == ETH_ALEN)
        pr_info("Read MAC addr from EEPROM: %pM\n", mac_addr);
}

static int __init davinci_init_id(struct davinci_soc_info *soc_info)
{
    int         i;
    struct davinci_id   *dip;
    u8          variant;
    u16         part_no;
    void __iomem        *base;

    base = ioremap(soc_info->jtag_id_reg, SZ_4K);
    if (!base) {
        pr_err("Unable to map JTAG ID register\n");
        return -ENOMEM;
    }

    soc_info->jtag_id = __raw_readl(base);
    iounmap(base);

    variant = (soc_info->jtag_id & 0xf0000000) >> 28;
    part_no = (soc_info->jtag_id & 0x0ffff000) >> 12;

    for (i = 0, dip = soc_info->ids; i < soc_info->ids_num;
            i++, dip++)
        /* Don't care about the manufacturer right now */
        if ((dip->part_no == part_no) && (dip->variant == variant)) {
            soc_info->cpu_id = dip->cpu_id;
            pr_info("DaVinci %s variant 0x%x\n", dip->name,
                    dip->variant);
            return 0;
        }

    pr_err("Unknown DaVinci JTAG ID 0x%x\n", soc_info->jtag_id);
    return -EINVAL;
}

void __init davinci_common_init(struct davinci_soc_info *soc_info)
{
    int ret;

    if (!soc_info) {
        ret = -EINVAL;
        goto err;
    }

    memcpy(&davinci_soc_info, soc_info, sizeof(struct davinci_soc_info));

    if (davinci_soc_info.io_desc && (davinci_soc_info.io_desc_num > 0))
        iotable_init(davinci_soc_info.io_desc,
                davinci_soc_info.io_desc_num);

    init_consistent_dma_size(14 << 20);

    /*
     * Normally devicemaps_init() would flush caches and tlb after
     * mdesc->map_io(), but we must also do it here because of the CPU
     * revision check below.
     */
    local_flush_tlb_all();
    flush_cache_all();

    /*
     * We want to check CPU revision early for cpu_is_xxxx() macros.
     * IO space mapping must be initialized before we can do that.
     */
    ret = davinci_init_id(&davinci_soc_info);
    if (ret < 0)
        goto err;

    if (davinci_soc_info.cpu_clks) {
        ret = davinci_clk_init(davinci_soc_info.cpu_clks);

        if (ret != 0)
            goto err;
    }

    return;

err:
    panic("davinci_common_init: SoC Initialization failed\n");
}

void __init davinci_init_late(void)
{
    davinci_cpufreq_init();
    davinci_pm_init();
    davinci_clk_disable_unused();
}