static int __init omap1_system_dma_init()

in mach-omap1/dma.c [310:414]

• 87 lines of code
• 13 McCabe index (conditional complexity)

static int __init omap1_system_dma_init(void)
{
	struct omap_system_dma_plat_info	p;
	struct omap_dma_dev_attr		*d;
	struct platform_device			*pdev, *dma_pdev;
	int ret;

	pdev = platform_device_alloc("omap_dma_system", 0);
	if (!pdev) {
		pr_err("%s: Unable to device alloc for dma\n",
			__func__);
		return -ENOMEM;
	}

	dma_base = ioremap(res[0].start, resource_size(&res[0]));
	if (!dma_base) {
		pr_err("%s: Unable to ioremap\n", __func__);
		ret = -ENODEV;
		goto exit_device_put;
	}

	ret = platform_device_add_resources(pdev, res, ARRAY_SIZE(res));
	if (ret) {
		dev_err(&pdev->dev, "%s: Unable to add resources for %s%d\n",
			__func__, pdev->name, pdev->id);
		goto exit_iounmap;
	}

	d = kzalloc(sizeof(*d), GFP_KERNEL);
	if (!d) {
		ret = -ENOMEM;
		goto exit_iounmap;
	}

	/* Valid attributes for omap1 plus processors */
	if (cpu_is_omap15xx())
		d->dev_caps = ENABLE_1510_MODE;
	enable_1510_mode = d->dev_caps & ENABLE_1510_MODE;

	if (cpu_is_omap16xx())
		d->dev_caps = ENABLE_16XX_MODE;

	d->dev_caps		|= SRC_PORT;
	d->dev_caps		|= DST_PORT;
	d->dev_caps		|= SRC_INDEX;
	d->dev_caps		|= DST_INDEX;
	d->dev_caps		|= IS_BURST_ONLY4;
	d->dev_caps		|= CLEAR_CSR_ON_READ;
	d->dev_caps		|= IS_WORD_16;

	/* available logical channels */
	if (cpu_is_omap15xx()) {
		d->lch_count = 9;
	} else {
		if (d->dev_caps & ENABLE_1510_MODE)
			d->lch_count = 9;
		else
			d->lch_count = 16;
	}

	p = dma_plat_info;
	p.dma_attr = d;
	p.errata = configure_dma_errata();

	if (cpu_is_omap7xx()) {
		p.slave_map = omap7xx_sdma_map;
		p.slavecnt = ARRAY_SIZE(omap7xx_sdma_map);
	} else {
		p.slave_map = omap1xxx_sdma_map;
		p.slavecnt = ARRAY_SIZE(omap1xxx_sdma_map);
	}

	ret = platform_device_add_data(pdev, &p, sizeof(p));
	if (ret) {
		dev_err(&pdev->dev, "%s: Unable to add resources for %s%d\n",
			__func__, pdev->name, pdev->id);
		goto exit_release_d;
	}

	ret = platform_device_add(pdev);
	if (ret) {
		dev_err(&pdev->dev, "%s: Unable to add resources for %s%d\n",
			__func__, pdev->name, pdev->id);
		goto exit_release_d;
	}

	dma_pdev = platform_device_register_full(&omap_dma_dev_info);
	if (IS_ERR(dma_pdev)) {
		ret = PTR_ERR(dma_pdev);
		goto exit_release_pdev;
	}

	return ret;

exit_release_pdev:
	platform_device_del(pdev);
exit_release_d:
	kfree(d);
exit_iounmap:
	iounmap(dma_base);
exit_device_put:
	platform_device_put(pdev);

	return ret;
}