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Date: Fri, 5 Dec 2008 23:53:45 +0200
From: Felipe Balbi <me@...ipebalbi.com>
To: Trilok Soni <soni.trilok@...il.com>
Cc: samuel@...tiz.org, linux-kernel@...r.kernel.org,
irda-users@...ts.sourceforge.net,
Andrew Morton <akpm@...ux-foundation.org>,
linux-omap@...r.kernel.org
Subject: Re: [irda-users] [PATCH] OMAP IrDA driver
On Fri, Dec 05, 2008 at 03:18:10PM +0530, Trilok Soni wrote:
> +struct omap_irda {
> + unsigned char open;
> + int speed; /* Current IrDA speed */
> + int newspeed;
> +
> + struct net_device_stats stats;
> + struct irlap_cb *irlap;
> + struct qos_info qos;
> +
> + int rx_dma_channel;
> + int tx_dma_channel;
> +
> + dma_addr_t rx_buf_dma_phys; /* Physical address of RX DMA buffer */
> + dma_addr_t tx_buf_dma_phys; /* Physical address of TX DMA buffer */
> +
> + void *rx_buf_dma_virt; /* Virtual address of RX DMA buffer */
> + void *tx_buf_dma_virt; /* Virtual address of TX DMA buffer */
should these two be void __iomem * ?
> +
> + struct device *dev;
> + struct omap_irda_config *pdata;
> +};
> +
> +static inline void uart_reg_out(int idx, u8 val)
> +{
> + omap_writeb(val, idx);
__raw_writeb(), pass a reference to struct omap_irda here so you'd have
access to a void __iomem *base (read below).
> +}
> +
> +static inline u8 uart_reg_in(int idx)
> +{
> + u8 b = omap_readb(idx);
ditto.
> + return b;
> +}
> +
> +/* forward declarations */
> +static int omap_irda_set_speed(struct net_device *dev, int speed);
> +
> +static void omap_irda_start_rx_dma(struct omap_irda *omap_ir)
> +{
> + /* Configure DMA */
> + omap_set_dma_src_params(omap_ir->rx_dma_channel, 0x3, 0x0,
> + omap_ir->pdata->src_start,
> + 0, 0);
> +
> + omap_enable_dma_irq(omap_ir->rx_dma_channel, 0x01);
> +
> + omap_set_dma_dest_params(omap_ir->rx_dma_channel, 0x0, 0x1,
> + omap_ir->rx_buf_dma_phys,
> + 0, 0);
> +
> + omap_set_dma_transfer_params(omap_ir->rx_dma_channel, 0x0,
> + IRDA_SKB_MAX_MTU, 0x1,
> + 0x0, omap_ir->pdata->rx_trigger, 0);
> +
> + omap_start_dma(omap_ir->rx_dma_channel);
> +}
> +
> +static void omap_start_tx_dma(struct omap_irda *omap_ir, int size)
> +{
> + /* Configure DMA */
> + omap_set_dma_dest_params(omap_ir->tx_dma_channel, 0x03, 0x0,
> + omap_ir->pdata->dest_start, 0, 0);
> +
> + omap_enable_dma_irq(omap_ir->tx_dma_channel, 0x01);
> +
> + omap_set_dma_src_params(omap_ir->tx_dma_channel, 0x0, 0x1,
> + omap_ir->tx_buf_dma_phys,
> + 0, 0);
> +
> + omap_set_dma_transfer_params(omap_ir->tx_dma_channel, 0x0, size, 0x1,
> + 0x0, omap_ir->pdata->tx_trigger, 0);
> +
> + /* Start DMA */
> + omap_start_dma(omap_ir->tx_dma_channel);
> +}
> +
> +/* DMA RX callback - normally, we should not go here,
> + * it calls only if something is going wrong
> + */
> +static void omap_irda_rx_dma_callback(int lch, u16 ch_status, void *data)
> +{
> + struct net_device *dev = data;
> + struct omap_irda *omap_ir = netdev_priv(dev);
> +
> + printk(KERN_ERR "RX Transfer error or very big frame\n");
you have a device pointer in omap_ir, use it and convert these to
dev_dbg() calls.
ditto to all below.
> +static int omap_irda_startup(struct net_device *dev)
> +{
> + struct omap_irda *omap_ir = netdev_priv(dev);
> +
> + /* FIXME: use clk_* apis for UART3 clock*/
> + /* Enable UART3 clock and set UART3 to IrDA mode */
> + if (machine_is_omap_h2() || machine_is_omap_h3())
> + omap_writel(omap_readl(MOD_CONF_CTRL_0) | (1 << 31) | (1 << 15),
> + MOD_CONF_CTRL_0);
> +
> + /* Only for H2?
> + */
> + if (omap_ir->pdata->transceiver_mode && machine_is_omap_h2()) {
> + /* Is it select_irda on H2 ? */
> + omap_writel(omap_readl(FUNC_MUX_CTRL_A) | 7,
> + FUNC_MUX_CTRL_A);
__raw_writel/__raw_readl.
> +static int omap_irda_probe(struct platform_device *pdev)
> +{
> + struct net_device *dev;
> + struct omap_irda *omap_ir;
> + struct omap_irda_config *pdata = pdev->dev.platform_data;
> + unsigned int baudrate_mask;
> + int err = 0;
> + int irq = NO_IRQ;
you should probably have a struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
and use it to ioremap() the base address. Then you can stop using the
omap_read[bsl]/omap_write[bsl] calls and switch over to standard
__raw_read[bsl]/__raw_write[bsl] ones.
> +
> + if (!pdata) {
> + printk(KERN_ERR "IrDA Platform data not supplied\n");
dev_dbg(&pdev->dev, "..");
> + return -ENOENT;
> + }
> +
> + if (!pdata->rx_channel || !pdata->tx_channel) {
> + printk(KERN_ERR "IrDA invalid rx/tx channel value\n");
dev_dbg(&pdev->dev, "..");
> + return -ENOENT;
> + }
> +
> + irq = platform_get_irq(pdev, 0);
> + if (irq <= 0) {
> + printk(KERN_WARNING "no irq for IrDA\n");
dev_dbg(&pdev->dev, "..");
> + return -ENOENT;
> + }
> +
> + dev = alloc_irdadev(sizeof(struct omap_irda));
> + if (!dev)
> + goto err_mem_1;
> +
> +
one blank line only.
> + omap_ir = netdev_priv(dev);
> + omap_ir->dev = &pdev->dev;
> + omap_ir->pdata = pdata;
> +
> + dev->hard_start_xmit = omap_irda_hard_xmit;
> + dev->open = omap_irda_start;
> + dev->stop = omap_irda_stop;
> + dev->do_ioctl = omap_irda_ioctl;
> + dev->get_stats = omap_irda_stats;
> + dev->irq = irq;
> +
> + irda_init_max_qos_capabilies(&omap_ir->qos);
> +
> + baudrate_mask = 0;
> + if (omap_ir->pdata->transceiver_cap & IR_SIRMODE)
> + baudrate_mask |= IR_9600|IR_19200|IR_38400|IR_57600|IR_115200;
> + if (omap_ir->pdata->transceiver_cap & IR_MIRMODE)
> + baudrate_mask |= IR_57600 | IR_1152000;
> + if (omap_ir->pdata->transceiver_cap & IR_FIRMODE)
> + baudrate_mask |= IR_4000000 << 8;
> +
> + omap_ir->qos.baud_rate.bits &= baudrate_mask;
> + omap_ir->qos.min_turn_time.bits = 7;
> +
> + irda_qos_bits_to_value(&omap_ir->qos);
> +
> + /* Any better way to avoid this? No. */
> + if (machine_is_omap_h3() || machine_is_omap_h4())
> + INIT_DELAYED_WORK(&omap_ir->pdata->gpio_expa, NULL);
what does this mean ? what's that gpio_expa??
> +
> + err = register_netdev(dev);
> + if (!err)
> + platform_set_drvdata(pdev, dev);
> + else
> + free_netdev(dev);
> +
> +err_mem_1:
> + return err;
> +}
> +
> +static int omap_irda_remove(struct platform_device *pdev)
> +{
> + struct net_device *dev = platform_get_drvdata(pdev);
> +
> + if (pdev) {
> + unregister_netdev(dev);
> + free_netdev(dev);
> + }
pdev is always true here, remove this if().
> + return 0;
> +}
> +
> +static struct platform_driver omapir_driver = {
> + .probe = omap_irda_probe,
> + .remove = omap_irda_remove,
> + .suspend = omap_irda_suspend,
> + .resume = omap_irda_resume,
> + .driver = {
> + .name = "omapirda",
> + .owner = THIS_MODULE,
> + },
> +};
> +
> +static char __initdata banner[] = KERN_INFO "OMAP IrDA driver initializing\n";
> +
> +static int __init omap_irda_init(void)
> +{
> + printk(banner);
you can remove this banner. No need for it.
> + return platform_driver_register(&omapir_driver);
> +}
> +
> +static void __exit omap_irda_exit(void)
> +{
> + platform_driver_unregister(&omapir_driver);
> +}
> +
> +module_init(omap_irda_init);
> +module_exit(omap_irda_exit);
> +
> +MODULE_AUTHOR("MontaVista");
> +MODULE_DESCRIPTION("OMAP IrDA Driver");
> +MODULE_LICENSE("GPL");
--
balbi
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