timer.c

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#include <linux/clk.h>
#include <linux/io.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/platform_device.h>

#include <mach/irqs.h>

#include <plat/dmtimer.h>

#define OMAP1610_GPTIMER1_BASE      0xfffb1400
#define OMAP1610_GPTIMER2_BASE      0xfffb1c00
#define OMAP1610_GPTIMER3_BASE      0xfffb2400
#define OMAP1610_GPTIMER4_BASE      0xfffb2c00
#define OMAP1610_GPTIMER5_BASE      0xfffb3400
#define OMAP1610_GPTIMER6_BASE      0xfffb3c00
#define OMAP1610_GPTIMER7_BASE      0xfffb7400
#define OMAP1610_GPTIMER8_BASE      0xfffbd400

#define OMAP1_DM_TIMER_COUNT        8

static int omap1_dm_timer_set_src(struct platform_device *pdev,
                int source)
{
    int n = (pdev->id - 1) << 1;
    u32 l;

    l = omap_readl(MOD_CONF_CTRL_1) & ~(0x03 << n);
    l |= source << n;
    omap_writel(l, MOD_CONF_CTRL_1);

    return 0;
}

static int __init omap1_dm_timer_init(void)
{
    int i;
    int ret;
    struct dmtimer_platform_data *pdata;
    struct platform_device *pdev;

    if (!cpu_is_omap16xx())
        return 0;

    for (i = 1; i <= OMAP1_DM_TIMER_COUNT; i++) {
        struct resource res[2];
        u32 base, irq;

        switch (i) {
        case 1:
            base = OMAP1610_GPTIMER1_BASE;
            irq = INT_1610_GPTIMER1;
            break;
        case 2:
            base = OMAP1610_GPTIMER2_BASE;
            irq = INT_1610_GPTIMER2;
            break;
        case 3:
            base = OMAP1610_GPTIMER3_BASE;
            irq = INT_1610_GPTIMER3;
            break;
        case 4:
            base = OMAP1610_GPTIMER4_BASE;
            irq = INT_1610_GPTIMER4;
            break;
        case 5:
            base = OMAP1610_GPTIMER5_BASE;
            irq = INT_1610_GPTIMER5;
            break;
        case 6:
            base = OMAP1610_GPTIMER6_BASE;
            irq = INT_1610_GPTIMER6;
            break;
        case 7:
            base = OMAP1610_GPTIMER7_BASE;
            irq = INT_1610_GPTIMER7;
            break;
        case 8:
            base = OMAP1610_GPTIMER8_BASE;
            irq = INT_1610_GPTIMER8;
            break;
        default:
            /*
             * not supposed to reach here.
             * this is to remove warning.
             */
            return -EINVAL;
        }

        pdev = platform_device_alloc("omap_timer", i);
        if (!pdev) {
            pr_err("%s: Failed to device alloc for dmtimer%d\n",
                __func__, i);
            return -ENOMEM;
        }

        memset(res, 0, 2 * sizeof(struct resource));
        res[0].start = base;
        res[0].end = base + 0x46;
        res[0].flags = IORESOURCE_MEM;
        res[1].start = irq;
        res[1].end = irq;
        res[1].flags = IORESOURCE_IRQ;
        ret = platform_device_add_resources(pdev, res,
                ARRAY_SIZE(res));
        if (ret) {
            dev_err(&pdev->dev, "%s: Failed to add resources.\n",
                __func__);
            goto err_free_pdev;
        }

        pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
        if (!pdata) {
            dev_err(&pdev->dev, "%s: Failed to allocate pdata.\n",
                __func__);
            ret = -ENOMEM;
            goto err_free_pdata;
        }

        pdata->set_timer_src = omap1_dm_timer_set_src;
        pdata->timer_capability = OMAP_TIMER_ALWON |
                OMAP_TIMER_NEEDS_RESET | OMAP_TIMER_HAS_DSP_IRQ;

        ret = platform_device_add_data(pdev, pdata, sizeof(*pdata));
        if (ret) {
            dev_err(&pdev->dev, "%s: Failed to add platform data.\n",
                __func__);
            goto err_free_pdata;
        }

        ret = platform_device_add(pdev);
        if (ret) {
            dev_err(&pdev->dev, "%s: Failed to add platform device.\n",
                __func__);
            goto err_free_pdata;
        }

        dev_dbg(&pdev->dev, " Registered.\n");
    }

    return 0;

err_free_pdata:
    kfree(pdata);

err_free_pdev:
    platform_device_unregister(pdev);

    return ret;
}
arch_initcall(omap1_dm_timer_init);