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Message-ID: <20100319163849.GB30409@sortiz.org>
Date: Fri, 19 Mar 2010 17:38:51 +0100
From: Samuel Ortiz <sameo@...ux.intel.com>
To: "Ira W. Snyder" <iws@...o.caltech.edu>
Cc: linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
socketcan-core@...ts.berlios.de
Subject: Re: [PATCH 1/3] mfd: add support for Janz CMOD-IO PCI MODULbus
Carrier Board
Hi Ira,
Some comments below:
On Thu, Mar 18, 2010 at 09:38:42AM -0700, Ira W. Snyder wrote:
> +/* Module Parameters */
> +static unsigned int num_modules = CMODIO_MAX_MODULES;
> +static unsigned char *modules[CMODIO_MAX_MODULES] = {
> + "janz-ican3",
> + "janz-ican3",
> + "",
> + "janz-ttl",
> +};
That's not very nice, but I honestly dont know how to make it less ugly...
At least this should be all left blank by default, as Wolfgang hinted.
> +/*
> + * Subdevice Support
> + */
Please use the mfd-core API for building and registering platform sub devices.
The pieces of code below should shrink significantly.
> +static int cmodio_remove_subdev(struct device *dev, void *data)
> +{
> + platform_device_unregister(to_platform_device(dev));
> + return 0;
> +}
> +
> +static void cmodio_subdev_release(struct device *dev)
> +{
> + kfree(to_platform_device(dev));
> +}
> +
> +static struct platform_device *cmodio_create_subdev(struct cmodio_device *priv,
> + char *name,
> + unsigned int res_count,
> + unsigned int pdata_size)
> +{
> + struct platform_device *pdev;
> + size_t res_size;
> +
> + res_size = sizeof(struct resource) * res_count;
> + pdev = kzalloc(sizeof(*pdev) + res_size + pdata_size, GFP_KERNEL);
> + if (!pdev)
> + return NULL;
> +
> + pdev->dev.release = cmodio_subdev_release;
> + pdev->dev.parent = &priv->pdev->dev;
> + pdev->name = name;
> +
> + if (res_count) {
> + pdev->resource = (struct resource *)(pdev + 1);
> + pdev->num_resources = res_count;
> + }
> +
> + if (pdata_size)
> + pdev->dev.platform_data = (void *)(pdev + 1) + res_size;
> +
> + return pdev;
> +}
> +
> +/* Create a memory resource for a subdevice */
> +static void cmodio_create_mem(struct resource *parent, struct resource *res,
> + resource_size_t offset, resource_size_t size)
> +{
> + res->flags = IORESOURCE_MEM;
> + res->parent = parent;
> + res->start = parent->start + offset;
> + res->end = parent->start + offset + size - 1;
> +}
> +
> +/* Create an IRQ resource for a subdevice */
> +static void cmodio_create_irq(struct resource *res, unsigned int irq)
> +{
> + res->flags = IORESOURCE_IRQ;
> + res->parent = NULL;
> + res->start = irq;
> + res->end = irq;
> +}
> +
> +static int __devinit cmodio_probe_subdevice(struct cmodio_device *priv,
> + char *name, unsigned int modno)
> +{
> + struct janz_platform_data *pdata;
> + struct platform_device *pdev;
> + resource_size_t offset, size;
> + struct pci_dev *pci;
> + int ret;
> +
> + pci = priv->pdev;
> + pdev = cmodio_create_subdev(priv, name, 3, sizeof(*pdata));
> + if (!pdev) {
> + dev_err(&pci->dev, "MODULbus slot %d alloc failed\n", modno);
> + ret = -ENOMEM;
> + goto out_return;
> + }
> +
> + pdata = pdev->dev.platform_data;
> + pdata->modno = modno;
> + pdev->id = priv->subdev_id++;
> +
> + /* MODULbus registers -- PCI BAR3 is big-endian MODULbus access */
> + offset = CMODIO_MODULBUS_SIZE * modno;
> + size = CMODIO_MODULBUS_SIZE;
> + cmodio_create_mem(&pci->resource[3], &pdev->resource[0], offset, size);
> +
> + /* PLX Control Registers -- PCI BAR4 is interrupt and other registers */
> + offset = 0;
> + size = resource_size(&pci->resource[4]);
> + cmodio_create_mem(&pci->resource[4], &pdev->resource[1], offset, size);
> +
> + /* IRQ */
> + cmodio_create_irq(&pdev->resource[2], pci->irq);
> +
> + /* Register the device */
> + ret = platform_device_register(pdev);
> + if (ret) {
> + dev_err(&pci->dev, "MODULbus slot %d register failed\n", modno);
> + goto out_free;
> + }
> +
> + return 0;
> +
> +out_free:
> + cmodio_subdev_release(&pdev->dev);
> +out_return:
> + return ret;
> +}
> +
> +/* Probe each submodule using kernel parameters */
> +static int __devinit cmodio_probe_submodules(struct cmodio_device *priv)
> +{
> + char *name;
> + int i;
> +
> + for (i = 0; i < num_modules; i++) {
> + name = modules[i];
> + if (!strcmp(name, ""))
> + continue;
> +
> + dev_dbg(&priv->pdev->dev, "MODULbus %d: name %s\n", i, name);
> + cmodio_probe_subdevice(priv, name, i);
> + }
> +
> + return 0;
> +}
> +/*
> + * PCI Driver
> + */
> +
> +static int __devinit cmodio_pci_probe(struct pci_dev *dev,
> + const struct pci_device_id *id)
> +{
> + struct cmodio_device *priv;
> + int ret;
> +
> + priv = kzalloc(sizeof(*priv), GFP_KERNEL);
> + if (!priv) {
> + dev_err(&dev->dev, "unable to allocate private data\n");
> + ret = -ENOMEM;
> + goto out_return;
> + }
> +
> + pci_set_drvdata(dev, priv);
> + priv->pdev = dev;
> +
> + /* Hardware Initialization */
> + ret = pci_enable_device(dev);
> + if (ret) {
> + dev_err(&dev->dev, "unable to enable device\n");
> + goto out_free_priv;
> + }
> +
> + pci_set_master(dev);
> + ret = pci_request_regions(dev, DRV_NAME);
> + if (ret) {
> + dev_err(&dev->dev, "unable to request regions\n");
> + goto out_pci_disable_device;
> + }
> +
> + /* Onboard configuration registers */
> + priv->ctrl = pci_ioremap_bar(dev, 4);
Why 4 ?
> +#define PCI_VENDOR_ID_JANZ 0x13c3
That probably belongs to pci_ids.h
Cheers,
Samuel.
--
Intel Open Source Technology Centre
http://oss.intel.com/
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