ep8248e.c

Go to the documentation of this file.

/*
 * Embedded Planet EP8248E support
 *
 * Copyright 2007 Freescale Semiconductor, Inc.
 * Author: Scott Wood <[email protected]>
 *
 * This program is free software; you can redistribute  it and/or modify it
 * under  the terms of  the GNU General  Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 */

#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/fsl_devices.h>
#include <linux/mdio-bitbang.h>
#include <linux/of_mdio.h>
#include <linux/slab.h>
#include <linux/of_platform.h>

#include <asm/io.h>
#include <asm/cpm2.h>
#include <asm/udbg.h>
#include <asm/machdep.h>
#include <asm/time.h>
#include <asm/mpc8260.h>
#include <asm/prom.h>

#include <sysdev/fsl_soc.h>
#include <sysdev/cpm2_pic.h>

#include "pq2.h"

static u8 __iomem *ep8248e_bcsr;
static struct device_node *ep8248e_bcsr_node;

#define BCSR7_SCC2_ENABLE 0x10

#define BCSR8_PHY1_ENABLE 0x80
#define BCSR8_PHY1_POWER  0x40
#define BCSR8_PHY2_ENABLE 0x20
#define BCSR8_PHY2_POWER  0x10
#define BCSR8_MDIO_READ   0x04
#define BCSR8_MDIO_CLOCK  0x02
#define BCSR8_MDIO_DATA   0x01

#define BCSR9_USB_ENABLE  0x80
#define BCSR9_USB_POWER   0x40
#define BCSR9_USB_HOST    0x20
#define BCSR9_USB_FULL_SPEED_TARGET 0x10

static void __init ep8248e_pic_init(void)
{
    struct device_node *np = of_find_compatible_node(NULL, NULL, "fsl,pq2-pic");
    if (!np) {
        printk(KERN_ERR "PIC init: can not find cpm-pic node\n");
        return;
    }

    cpm2_pic_init(np);
    of_node_put(np);
}

static void ep8248e_set_mdc(struct mdiobb_ctrl *ctrl, int level)
{
    if (level)
        setbits8(&ep8248e_bcsr[8], BCSR8_MDIO_CLOCK);
    else
        clrbits8(&ep8248e_bcsr[8], BCSR8_MDIO_CLOCK);

    /* Read back to flush the write. */
    in_8(&ep8248e_bcsr[8]);
}

static void ep8248e_set_mdio_dir(struct mdiobb_ctrl *ctrl, int output)
{
    if (output)
        clrbits8(&ep8248e_bcsr[8], BCSR8_MDIO_READ);
    else
        setbits8(&ep8248e_bcsr[8], BCSR8_MDIO_READ);

    /* Read back to flush the write. */
    in_8(&ep8248e_bcsr[8]);
}

static void ep8248e_set_mdio_data(struct mdiobb_ctrl *ctrl, int data)
{
    if (data)
        setbits8(&ep8248e_bcsr[8], BCSR8_MDIO_DATA);
    else
        clrbits8(&ep8248e_bcsr[8], BCSR8_MDIO_DATA);

    /* Read back to flush the write. */
    in_8(&ep8248e_bcsr[8]);
}

static int ep8248e_get_mdio_data(struct mdiobb_ctrl *ctrl)
{
    return in_8(&ep8248e_bcsr[8]) & BCSR8_MDIO_DATA;
}

static const struct mdiobb_ops ep8248e_mdio_ops = {
    .set_mdc = ep8248e_set_mdc,
    .set_mdio_dir = ep8248e_set_mdio_dir,
    .set_mdio_data = ep8248e_set_mdio_data,
    .get_mdio_data = ep8248e_get_mdio_data,
    .owner = THIS_MODULE,
};

static struct mdiobb_ctrl ep8248e_mdio_ctrl = {
    .ops = &ep8248e_mdio_ops,
};

static int __devinit ep8248e_mdio_probe(struct platform_device *ofdev)
{
    struct mii_bus *bus;
    struct resource res;
    struct device_node *node;
    int ret;

    node = of_get_parent(ofdev->dev.of_node);
    of_node_put(node);
    if (node != ep8248e_bcsr_node)
        return -ENODEV;

    ret = of_address_to_resource(ofdev->dev.of_node, 0, &res);
    if (ret)
        return ret;

    bus = alloc_mdio_bitbang(&ep8248e_mdio_ctrl);
    if (!bus)
        return -ENOMEM;

    bus->irq = kmalloc(sizeof(int) * PHY_MAX_ADDR, GFP_KERNEL);
    if (bus->irq == NULL) {
        ret = -ENOMEM;
        goto err_free_bus;
    }

    bus->name = "ep8248e-mdio-bitbang";
    bus->parent = &ofdev->dev;
    snprintf(bus->id, MII_BUS_ID_SIZE, "%x", res.start);

    ret = of_mdiobus_register(bus, ofdev->dev.of_node);
    if (ret)
        goto err_free_irq;

    return 0;
err_free_irq:
    kfree(bus->irq);
err_free_bus:
    free_mdio_bitbang(bus);
    return ret;
}

static int ep8248e_mdio_remove(struct platform_device *ofdev)
{
    BUG();
    return 0;
}

static const struct of_device_id ep8248e_mdio_match[] = {
    {
        .compatible = "fsl,ep8248e-mdio-bitbang",
    },
    {},
};

static struct platform_driver ep8248e_mdio_driver = {
    .driver = {
        .name = "ep8248e-mdio-bitbang",
        .owner = THIS_MODULE,
        .of_match_table = ep8248e_mdio_match,
    },
    .probe = ep8248e_mdio_probe,
    .remove = ep8248e_mdio_remove,
};

struct cpm_pin {
    int port, pin, flags;
};

static __initdata struct cpm_pin ep8248e_pins[] = {
    /* SMC1 */
    {2, 4, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
    {2, 5, CPM_PIN_OUTPUT | CPM_PIN_PRIMARY},

    /* SCC1 */
    {2, 14, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
    {2, 15, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
    {3, 29, CPM_PIN_OUTPUT | CPM_PIN_PRIMARY},
    {3, 30, CPM_PIN_OUTPUT | CPM_PIN_SECONDARY},
    {3, 31, CPM_PIN_INPUT | CPM_PIN_PRIMARY},

    /* FCC1 */
    {0, 14, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
    {0, 15, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
    {0, 16, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
    {0, 17, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
    {0, 18, CPM_PIN_OUTPUT | CPM_PIN_PRIMARY},
    {0, 19, CPM_PIN_OUTPUT | CPM_PIN_PRIMARY},
    {0, 20, CPM_PIN_OUTPUT | CPM_PIN_PRIMARY},
    {0, 21, CPM_PIN_OUTPUT | CPM_PIN_PRIMARY},
    {0, 26, CPM_PIN_INPUT | CPM_PIN_SECONDARY},
    {0, 27, CPM_PIN_INPUT | CPM_PIN_SECONDARY},
    {0, 28, CPM_PIN_OUTPUT | CPM_PIN_SECONDARY},
    {0, 29, CPM_PIN_OUTPUT | CPM_PIN_SECONDARY},
    {0, 30, CPM_PIN_INPUT | CPM_PIN_SECONDARY},
    {0, 31, CPM_PIN_INPUT | CPM_PIN_SECONDARY},
    {2, 21, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
    {2, 22, CPM_PIN_INPUT | CPM_PIN_PRIMARY},

    /* FCC2 */
    {1, 18, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
    {1, 19, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
    {1, 20, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
    {1, 21, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
    {1, 22, CPM_PIN_OUTPUT | CPM_PIN_PRIMARY},
    {1, 23, CPM_PIN_OUTPUT | CPM_PIN_PRIMARY},
    {1, 24, CPM_PIN_OUTPUT | CPM_PIN_PRIMARY},
    {1, 25, CPM_PIN_OUTPUT | CPM_PIN_PRIMARY},
    {1, 26, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
    {1, 27, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
    {1, 28, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
    {1, 29, CPM_PIN_OUTPUT | CPM_PIN_SECONDARY},
    {1, 30, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
    {1, 31, CPM_PIN_OUTPUT | CPM_PIN_PRIMARY},
    {2, 18, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
    {2, 19, CPM_PIN_INPUT | CPM_PIN_PRIMARY},

    /* I2C */
    {4, 14, CPM_PIN_INPUT | CPM_PIN_SECONDARY},
    {4, 15, CPM_PIN_INPUT | CPM_PIN_SECONDARY},

    /* USB */
    {2, 10, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
    {2, 11, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
    {2, 20, CPM_PIN_OUTPUT | CPM_PIN_PRIMARY},
    {2, 24, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
    {3, 23, CPM_PIN_OUTPUT | CPM_PIN_PRIMARY},
    {3, 24, CPM_PIN_OUTPUT | CPM_PIN_PRIMARY},
    {3, 25, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
};

static void __init init_ioports(void)
{
    int i;

    for (i = 0; i < ARRAY_SIZE(ep8248e_pins); i++) {
        const struct cpm_pin *pin = &ep8248e_pins[i];
        cpm2_set_pin(pin->port, pin->pin, pin->flags);
    }

    cpm2_smc_clk_setup(CPM_CLK_SMC1, CPM_BRG7);
    cpm2_clk_setup(CPM_CLK_SCC1, CPM_BRG1, CPM_CLK_RX);
    cpm2_clk_setup(CPM_CLK_SCC1, CPM_BRG1, CPM_CLK_TX);
    cpm2_clk_setup(CPM_CLK_SCC3, CPM_CLK8, CPM_CLK_TX); /* USB */
    cpm2_clk_setup(CPM_CLK_FCC1, CPM_CLK11, CPM_CLK_RX);
    cpm2_clk_setup(CPM_CLK_FCC1, CPM_CLK10, CPM_CLK_TX);
    cpm2_clk_setup(CPM_CLK_FCC2, CPM_CLK13, CPM_CLK_RX);
    cpm2_clk_setup(CPM_CLK_FCC2, CPM_CLK14, CPM_CLK_TX);
}

static void __init ep8248e_setup_arch(void)
{
    if (ppc_md.progress)
        ppc_md.progress("ep8248e_setup_arch()", 0);

    cpm2_reset();

    /* When this is set, snooping CPM DMA from RAM causes
     * machine checks.  See erratum SIU18.
     */
    clrbits32(&cpm2_immr->im_siu_conf.siu_82xx.sc_bcr, MPC82XX_BCR_PLDP);

    ep8248e_bcsr_node =
        of_find_compatible_node(NULL, NULL, "fsl,ep8248e-bcsr");
    if (!ep8248e_bcsr_node) {
        printk(KERN_ERR "No bcsr in device tree\n");
        return;
    }

    ep8248e_bcsr = of_iomap(ep8248e_bcsr_node, 0);
    if (!ep8248e_bcsr) {
        printk(KERN_ERR "Cannot map BCSR registers\n");
        of_node_put(ep8248e_bcsr_node);
        ep8248e_bcsr_node = NULL;
        return;
    }

    setbits8(&ep8248e_bcsr[7], BCSR7_SCC2_ENABLE);
    setbits8(&ep8248e_bcsr[8], BCSR8_PHY1_ENABLE | BCSR8_PHY1_POWER |
                               BCSR8_PHY2_ENABLE | BCSR8_PHY2_POWER);

    init_ioports();

    if (ppc_md.progress)
        ppc_md.progress("ep8248e_setup_arch(), finish", 0);
}

static  __initdata struct of_device_id of_bus_ids[] = {
    { .compatible = "simple-bus", },
    { .compatible = "fsl,ep8248e-bcsr", },
    {},
};

static int __init declare_of_platform_devices(void)
{
    of_platform_bus_probe(NULL, of_bus_ids, NULL);
    platform_driver_register(&ep8248e_mdio_driver);

    return 0;
}
machine_device_initcall(ep8248e, declare_of_platform_devices);

/*
 * Called very early, device-tree isn't unflattened
 */
static int __init ep8248e_probe(void)
{
    unsigned long root = of_get_flat_dt_root();
    return of_flat_dt_is_compatible(root, "fsl,ep8248e");
}

define_machine(ep8248e)
{
    .name = "Embedded Planet EP8248E",
    .probe = ep8248e_probe,
    .setup_arch = ep8248e_setup_arch,
    .init_IRQ = ep8248e_pic_init,
    .get_irq = cpm2_get_irq,
    .calibrate_decr = generic_calibrate_decr,
    .restart = pq2_restart,
    .progress = udbg_progress,
};