nettel.c

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/***************************************************************************/

/*
 *  nettel.c -- startup code support for the NETtel boards
 *
 *  Copyright (C) 2009, Greg Ungerer ([email protected])
 */

/***************************************************************************/

#include <linux/kernel.h>
#include <linux/param.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/platform_device.h>
#include <asm/coldfire.h>
#include <asm/mcfsim.h>
#include <asm/nettel.h>

/***************************************************************************/

/*
 * Define the IO and interrupt resources of the 2 SMC9196 interfaces.
 */
#define NETTEL_SMC0_ADDR    0x30600300
#define NETTEL_SMC0_IRQ     29

#define NETTEL_SMC1_ADDR    0x30600000
#define NETTEL_SMC1_IRQ     27

/*
 * We need some access into the SMC9196 registers. Define those registers
 * we will need here (including the smc91x.h doesn't seem to give us these
 * in a simple form).
 */
#define SMC91xx_BANKSELECT  14
#define SMC91xx_BASEADDR    2
#define SMC91xx_BASEMAC     4

/***************************************************************************/

static struct resource nettel_smc91x_0_resources[] = {
    {
        .start      = NETTEL_SMC0_ADDR,
        .end        = NETTEL_SMC0_ADDR + 0x20,
        .flags      = IORESOURCE_MEM,
    },
    {
        .start      = NETTEL_SMC0_IRQ,
        .end        = NETTEL_SMC0_IRQ,
        .flags      = IORESOURCE_IRQ,
    },
};

static struct resource nettel_smc91x_1_resources[] = {
    {
        .start      = NETTEL_SMC1_ADDR,
        .end        = NETTEL_SMC1_ADDR + 0x20,
        .flags      = IORESOURCE_MEM,
    },
    {
        .start      = NETTEL_SMC1_IRQ,
        .end        = NETTEL_SMC1_IRQ,
        .flags      = IORESOURCE_IRQ,
    },
};

static struct platform_device nettel_smc91x[] = {
    {
        .name           = "smc91x",
        .id         = 0,
        .num_resources      = ARRAY_SIZE(nettel_smc91x_0_resources),
        .resource       = nettel_smc91x_0_resources,
    },
    {
        .name           = "smc91x",
        .id         = 1,
        .num_resources      = ARRAY_SIZE(nettel_smc91x_1_resources),
        .resource       = nettel_smc91x_1_resources,
    },
};

static struct platform_device *nettel_devices[] __initdata = {
    &nettel_smc91x[0],
    &nettel_smc91x[1],
};

/***************************************************************************/

static u8 nettel_macdefault[] __initdata = {
    0x00, 0xd0, 0xcf, 0x00, 0x00, 0x01,
};

/*
 * Set flash contained MAC address into SMC9196 core. Make sure the flash
 * MAC address is sane, and not an empty flash. If no good use the Moreton
 * Bay default MAC address instead.
 */

static void __init nettel_smc91x_setmac(unsigned int ioaddr, unsigned int flashaddr)
{
    u16 *macp;

    macp = (u16 *) flashaddr;
    if ((macp[0] == 0xffff) && (macp[1] == 0xffff) && (macp[2] == 0xffff))
        macp = (u16 *) &nettel_macdefault[0];

    writew(1, NETTEL_SMC0_ADDR + SMC91xx_BANKSELECT);
    writew(macp[0], ioaddr + SMC91xx_BASEMAC);
    writew(macp[1], ioaddr + SMC91xx_BASEMAC + 2);
    writew(macp[2], ioaddr + SMC91xx_BASEMAC + 4);
}

/***************************************************************************/

/*
 * Re-map the address space of at least one of the SMC ethernet
 * parts. Both parts power up decoding the same address, so we
 * need to move one of them first, before doing anything else.
 */

static void __init nettel_smc91x_init(void)
{
    writew(0x00ec, MCFSIM_PADDR);
    mcf_setppdata(0, 0x0080);
    writew(1, NETTEL_SMC0_ADDR + SMC91xx_BANKSELECT);
    writew(0x0067, NETTEL_SMC0_ADDR + SMC91xx_BASEADDR);
    mcf_setppdata(0x0080, 0);

    /* Set correct chip select timing for SMC9196 accesses */
    writew(0x1180, MCFSIM_CSCR3);

    /* Set the SMC interrupts to be auto-vectored */
    mcf_autovector(NETTEL_SMC0_IRQ);
    mcf_autovector(NETTEL_SMC1_IRQ);

    /* Set MAC addresses from flash for both interfaces */
    nettel_smc91x_setmac(NETTEL_SMC0_ADDR, 0xf0006000);
    nettel_smc91x_setmac(NETTEL_SMC1_ADDR, 0xf0006006);
}

/***************************************************************************/

static int __init init_nettel(void)
{
    nettel_smc91x_init();
    platform_add_devices(nettel_devices, ARRAY_SIZE(nettel_devices));
    return 0;
}

arch_initcall(init_nettel);

/***************************************************************************/