mpc52xx_psc_spi.c

linux 内核源代码

{
	struct mpc52xx_cdm __iomem *cdm;
	struct mpc52xx_gpio __iomem *gpio;
	struct mpc52xx_psc __iomem *psc = mps->psc;
	u32 ul;
	u32 mclken_div;
	int ret = 0;

#if defined(CONFIG_PPC_MERGE)
	cdm = mpc52xx_find_and_map("mpc5200-cdm");
	gpio = mpc52xx_find_and_map("mpc5200-gpio");
#else
	cdm = ioremap(MPC52xx_PA(MPC52xx_CDM_OFFSET), MPC52xx_CDM_SIZE);
	gpio = ioremap(MPC52xx_PA(MPC52xx_GPIO_OFFSET), MPC52xx_GPIO_SIZE);
#endif
	if (!cdm || !gpio) {
		printk(KERN_ERR "Error mapping CDM/GPIO\n");
		ret = -EFAULT;
		goto unmap_regs;
	}

	/* default sysclk is 512MHz */
	mclken_div = 0x8000 |
		(((mps->sysclk ? mps->sysclk : 512000000) / MCLK) & 0x1FF);

	switch (psc_id) {
	case 1:
		ul = in_be32(&gpio->port_config);
		ul &= 0xFFFFFFF8;
		ul |= 0x00000006;
		out_be32(&gpio->port_config, ul);
		out_be16(&cdm->mclken_div_psc1, mclken_div);
		ul = in_be32(&cdm->clk_enables);
		ul |= 0x00000020;
		out_be32(&cdm->clk_enables, ul);
		break;
	case 2:
		ul = in_be32(&gpio->port_config);
		ul &= 0xFFFFFF8F;
		ul |= 0x00000060;
		out_be32(&gpio->port_config, ul);
		out_be16(&cdm->mclken_div_psc2, mclken_div);
		ul = in_be32(&cdm->clk_enables);
		ul |= 0x00000040;
		out_be32(&cdm->clk_enables, ul);
		break;
	case 3:
		ul = in_be32(&gpio->port_config);
		ul &= 0xFFFFF0FF;
		ul |= 0x00000600;
		out_be32(&gpio->port_config, ul);
		out_be16(&cdm->mclken_div_psc3, mclken_div);
		ul = in_be32(&cdm->clk_enables);
		ul |= 0x00000080;
		out_be32(&cdm->clk_enables, ul);
		break;
	case 6:
		ul = in_be32(&gpio->port_config);
		ul &= 0xFF8FFFFF;
		ul |= 0x00700000;
		out_be32(&gpio->port_config, ul);
		out_be16(&cdm->mclken_div_psc6, mclken_div);
		ul = in_be32(&cdm->clk_enables);
		ul |= 0x00000010;
		out_be32(&cdm->clk_enables, ul);
		break;
	default:
		ret = -EINVAL;
		goto unmap_regs;
	}

	/* Reset the PSC into a known state */
	out_8(&psc->command, MPC52xx_PSC_RST_RX);
	out_8(&psc->command, MPC52xx_PSC_RST_TX);
	out_8(&psc->command, MPC52xx_PSC_TX_DISABLE | MPC52xx_PSC_RX_DISABLE);

	/* Disable interrupts, interrupts are based on alarm level */
	out_be16(&psc->mpc52xx_psc_imr, 0);
	out_8(&psc->command, MPC52xx_PSC_SEL_MODE_REG_1);
	out_8(&psc->rfcntl, 0);
	out_8(&psc->mode, MPC52xx_PSC_MODE_FFULL);

	/* Configure 8bit codec mode as a SPI master and use EOF flags */
	/* SICR_SIM_CODEC8|SICR_GENCLK|SICR_SPI|SICR_MSTR|SICR_USEEOF */
	out_be32(&psc->sicr, 0x0180C800);
	out_be16(&psc->ccr, 0x070F); /* by default SPI Clk 1MHz */

	/* Set 2ms DTL delay */
	out_8(&psc->ctur, 0x00);
	out_8(&psc->ctlr, 0x84);

	mps->bits_per_word = 8;

unmap_regs:
	if (cdm)
		iounmap(cdm);
	if (gpio)
		iounmap(gpio);

	return ret;
}

static irqreturn_t mpc52xx_psc_spi_isr(int irq, void *dev_id)
{
	struct mpc52xx_psc_spi *mps = (struct mpc52xx_psc_spi *)dev_id;
	struct mpc52xx_psc __iomem *psc = mps->psc;

	/* disable interrupt and wake up the work queue */
	if (in_be16(&psc->mpc52xx_psc_isr) & MPC52xx_PSC_IMR_RXRDY) {
		out_be16(&psc->mpc52xx_psc_imr, 0);
		complete(&mps->done);
		return IRQ_HANDLED;
	}
	return IRQ_NONE;
}

/* bus_num is used only for the case dev->platform_data == NULL */
static int __init mpc52xx_psc_spi_do_probe(struct device *dev, u32 regaddr,
				u32 size, unsigned int irq, s16 bus_num)
{
	struct fsl_spi_platform_data *pdata = dev->platform_data;
	struct mpc52xx_psc_spi *mps;
	struct spi_master *master;
	int ret;

	master = spi_alloc_master(dev, sizeof *mps);
	if (master == NULL)
		return -ENOMEM;

	dev_set_drvdata(dev, master);
	mps = spi_master_get_devdata(master);

	mps->irq = irq;
	if (pdata == NULL) {
		dev_warn(dev, "probe called without platform data, no "
				"(de)activate_cs function will be called\n");
		mps->activate_cs = NULL;
		mps->deactivate_cs = NULL;
		mps->sysclk = 0;
		master->bus_num = bus_num;
		master->num_chipselect = 255;
	} else {
		mps->activate_cs = pdata->activate_cs;
		mps->deactivate_cs = pdata->deactivate_cs;
		mps->sysclk = pdata->sysclk;
		master->bus_num = pdata->bus_num;
		master->num_chipselect = pdata->max_chipselect;
	}
	master->setup = mpc52xx_psc_spi_setup;
	master->transfer = mpc52xx_psc_spi_transfer;
	master->cleanup = mpc52xx_psc_spi_cleanup;

	mps->psc = ioremap(regaddr, size);
	if (!mps->psc) {
		dev_err(dev, "could not ioremap I/O port range\n");
		ret = -EFAULT;
		goto free_master;
	}

	ret = request_irq(mps->irq, mpc52xx_psc_spi_isr, 0, "mpc52xx-psc-spi",
				mps);
	if (ret)
		goto free_master;

	ret = mpc52xx_psc_spi_port_config(master->bus_num, mps);
	if (ret < 0)
		goto free_irq;

	spin_lock_init(&mps->lock);
	init_completion(&mps->done);
	INIT_WORK(&mps->work, mpc52xx_psc_spi_work);
	INIT_LIST_HEAD(&mps->queue);

	mps->workqueue = create_singlethread_workqueue(
		master->dev.parent->bus_id);
	if (mps->workqueue == NULL) {
		ret = -EBUSY;
		goto free_irq;
	}

	ret = spi_register_master(master);
	if (ret < 0)
		goto unreg_master;

	return ret;

unreg_master:
	destroy_workqueue(mps->workqueue);
free_irq:
	free_irq(mps->irq, mps);
free_master:
	if (mps->psc)
		iounmap(mps->psc);
	spi_master_put(master);

	return ret;
}

static int __exit mpc52xx_psc_spi_do_remove(struct device *dev)
{
	struct spi_master *master = dev_get_drvdata(dev);
	struct mpc52xx_psc_spi *mps = spi_master_get_devdata(master);

	flush_workqueue(mps->workqueue);
	destroy_workqueue(mps->workqueue);
	spi_unregister_master(master);
	free_irq(mps->irq, mps);
	if (mps->psc)
		iounmap(mps->psc);

	return 0;
}

#if !defined(CONFIG_PPC_MERGE)
static int __init mpc52xx_psc_spi_probe(struct platform_device *dev)
{
	switch(dev->id) {
	case 1:
	case 2:
	case 3:
	case 6:
		return mpc52xx_psc_spi_do_probe(&dev->dev,
			MPC52xx_PA(MPC52xx_PSCx_OFFSET(dev->id)),
			MPC52xx_PSC_SIZE, platform_get_irq(dev, 0), dev->id);
	default:
		return -EINVAL;
	}
}

static int __exit mpc52xx_psc_spi_remove(struct platform_device *dev)
{
	return mpc52xx_psc_spi_do_remove(&dev->dev);
}

static struct platform_driver mpc52xx_psc_spi_platform_driver = {
	.remove = __exit_p(mpc52xx_psc_spi_remove),
	.driver = {
		.name = "mpc52xx-psc-spi",
		.owner = THIS_MODULE,
	},
};

static int __init mpc52xx_psc_spi_init(void)
{
	return platform_driver_probe(&mpc52xx_psc_spi_platform_driver,
			mpc52xx_psc_spi_probe);
}
module_init(mpc52xx_psc_spi_init);

static void __exit mpc52xx_psc_spi_exit(void)
{
	platform_driver_unregister(&mpc52xx_psc_spi_platform_driver);
}
module_exit(mpc52xx_psc_spi_exit);

#else	/* defined(CONFIG_PPC_MERGE) */

static int __init mpc52xx_psc_spi_of_probe(struct of_device *op,
	const struct of_device_id *match)
{
	const u32 *regaddr_p;
	u64 regaddr64, size64;
	s16 id = -1;

	regaddr_p = of_get_address(op->node, 0, &size64, NULL);
	if (!regaddr_p) {
		printk(KERN_ERR "Invalid PSC address\n");
		return -EINVAL;
	}
	regaddr64 = of_translate_address(op->node, regaddr_p);

	/* get PSC id (1..6, used by port_config) */
	if (op->dev.platform_data == NULL) {
		const u32 *psc_nump;

		psc_nump = of_get_property(op->node, "cell-index", NULL);
		if (!psc_nump || *psc_nump > 5) {
			printk(KERN_ERR "mpc52xx_psc_spi: Device node %s has invalid "
					"cell-index property\n", op->node->full_name);
			return -EINVAL;
		}
		id = *psc_nump + 1;
	}

	return mpc52xx_psc_spi_do_probe(&op->dev, (u32)regaddr64, (u32)size64,
					irq_of_parse_and_map(op->node, 0), id);
}

static int __exit mpc52xx_psc_spi_of_remove(struct of_device *op)
{
	return mpc52xx_psc_spi_do_remove(&op->dev);
}

static struct of_device_id mpc52xx_psc_spi_of_match[] = {
	{ .type = "spi", .compatible = "mpc5200-psc-spi", },
	{},
};

MODULE_DEVICE_TABLE(of, mpc52xx_psc_spi_of_match);

static struct of_platform_driver mpc52xx_psc_spi_of_driver = {
	.owner = THIS_MODULE,
	.name = "mpc52xx-psc-spi",
	.match_table = mpc52xx_psc_spi_of_match,
	.probe = mpc52xx_psc_spi_of_probe,
	.remove = __exit_p(mpc52xx_psc_spi_of_remove),
	.driver = {
		.name = "mpc52xx-psc-spi",
		.owner = THIS_MODULE,
	},
};

static int __init mpc52xx_psc_spi_init(void)
{
	return of_register_platform_driver(&mpc52xx_psc_spi_of_driver);
}
module_init(mpc52xx_psc_spi_init);

static void __exit mpc52xx_psc_spi_exit(void)
{
	of_unregister_platform_driver(&mpc52xx_psc_spi_of_driver);
}
module_exit(mpc52xx_psc_spi_exit);

#endif	/* defined(CONFIG_PPC_MERGE) */

MODULE_AUTHOR("Dragos Carp");
MODULE_DESCRIPTION("MPC52xx PSC SPI Driver");
MODULE_LICENSE("GPL");