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Commit c770e001 authored by Laurent Pinchart's avatar Laurent Pinchart Committed by Felipe Balbi
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usb: isp1760: Refactor PCI initialization code 



Move the initialization code out of the PCI probe function to a new
function in order to simplify and fix error handling.

Signed-off-by: default avatarLaurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: default avatarFelipe Balbi <balbi@ti.com>
parent 10feee14

drivers/usb/host/isp1760-if.c

+69 −65
Original line number Diff line number Diff line
@@ -25,69 +25,34 @@ 
#endif



#ifdef CONFIG_PCI

static int isp1761_pci_probe(struct pci_dev *dev,

		const struct pci_device_id *id)

static int isp1761_pci_init(struct pci_dev *dev)

{

	resource_size_t mem_start;

	resource_size_t mem_length;

	u8 __iomem *iobase;

	u8 latency, limit;

	__u32 reg_data;

	int retry_count;

	unsigned int devflags = 0;

	int ret_status = 0;



	resource_size_t pci_mem_phy0;

	resource_size_t memlength;

	u32 reg_data;



	u8 __iomem *chip_addr;

	u8 __iomem *iobase;

	resource_size_t nxp_pci_io_base;

	resource_size_t iolength;



	if (usb_disabled())

		return -ENODEV;



	if (pci_enable_device(dev) < 0)

		return -ENODEV;



	if (!dev->irq)

		return -ENODEV;



	/* Grab the PLX PCI mem maped port start address we need  */

	nxp_pci_io_base = pci_resource_start(dev, 0);

	iolength = pci_resource_len(dev, 0);



	if (!request_mem_region(nxp_pci_io_base, iolength, "ISP1761 IO MEM")) {

		printk(KERN_ERR "request region #1\n");

		return -EBUSY;

	}



	iobase = ioremap_nocache(nxp_pci_io_base, iolength);

	if (!iobase) {

		printk(KERN_ERR "ioremap #1\n");

		ret_status = -ENOMEM;

		goto cleanup1;

	}

	/* Grab the PLX PCI shared memory of the ISP 1761 we need  */

	pci_mem_phy0 = pci_resource_start(dev, 3);

	memlength = pci_resource_len(dev, 3);

	if (memlength < 0xffff) {

	mem_start = pci_resource_start(dev, 3);

	mem_length = pci_resource_len(dev, 3);

	if (mem_length < 0xffff) {

		printk(KERN_ERR "memory length for this resource is wrong\n");

		ret_status = -ENOMEM;

		goto cleanup2;

		return -ENOMEM;

	}



	if (!request_mem_region(pci_mem_phy0, memlength, "ISP-PCI")) {

	if (!request_mem_region(mem_start, mem_length, "ISP-PCI")) {

		printk(KERN_ERR "host controller already in use\n");

		ret_status = -EBUSY;

		goto cleanup2;

		return -EBUSY;

	}



	/* map available memory */

	chip_addr = ioremap_nocache(pci_mem_phy0,memlength);

	if (!chip_addr) {

	iobase = ioremap_nocache(mem_start, mem_length);

	if (!iobase) {

		printk(KERN_ERR "Error ioremap failed\n");

		release_mem_region(pci_mem_phy0, memlength);

		ret_status = -ENOMEM;

		goto cleanup2;

		release_mem_region(mem_start, mem_length);

		return -ENOMEM;

	}



	/* bad pci latencies can contribute to overruns */
@@ -108,25 +73,38 @@ static int isp1761_pci_probe(struct pci_dev *dev, 
		/*by default host is in 16bit mode, so

		 * io operations at this stage must be 16 bit

		 * */

		writel(0xface, chip_addr + HC_SCRATCH_REG);

		writel(0xface, iobase + HC_SCRATCH_REG);

		udelay(100);

		reg_data = readl(chip_addr + HC_SCRATCH_REG) & 0x0000ffff;

		reg_data = readl(iobase + HC_SCRATCH_REG) & 0x0000ffff;

		retry_count--;

	}



	iounmap(chip_addr);

	release_mem_region(pci_mem_phy0, memlength);

	iounmap(iobase);

	release_mem_region(mem_start, mem_length);



	/* Host Controller presence is detected by writing to scratch register

	 * and reading back and checking the contents are same or not

	 */

	if (reg_data != 0xFACE) {

		dev_err(&dev->dev, "scratch register mismatch %x\n", reg_data);

		ret_status = -ENOMEM;

		goto cleanup2;

		return -ENOMEM;

	}



	pci_set_master(dev);

	/* Grab the PLX PCI mem maped port start address we need  */

	mem_start = pci_resource_start(dev, 0);

	mem_length = pci_resource_len(dev, 0);



	if (!request_mem_region(mem_start, mem_length, "ISP1761 IO MEM")) {

		printk(KERN_ERR "request region #1\n");

		return -EBUSY;

	}



	iobase = ioremap_nocache(mem_start, mem_length);

	if (!iobase) {

		printk(KERN_ERR "ioremap #1\n");

		release_mem_region(mem_start, mem_length);

		return -ENOMEM;

	}



	/* configure PLX PCI chip to pass interrupts */

#define PLX_INT_CSR_REG 0x68
@@ -136,17 +114,43 @@ static int isp1761_pci_probe(struct pci_dev *dev, 


	/* done with PLX IO access */

	iounmap(iobase);

	release_mem_region(nxp_pci_io_base, iolength);

	release_mem_region(mem_start, mem_length);



	return 0;

}



static int isp1761_pci_probe(struct pci_dev *dev,

		const struct pci_device_id *id)

{

	unsigned int devflags = 0;

	int ret;



	if (usb_disabled())

		return -ENODEV;



	if (!dev->irq)

		return -ENODEV;



	if (pci_enable_device(dev) < 0)

		return -ENODEV;



	ret = isp1761_pci_init(dev);

	if (ret < 0)

		goto error;



	pci_set_master(dev);



	dev->dev.dma_mask = NULL;

	return isp1760_register(&dev->resource[3], dev->irq, IRQF_SHARED,

	ret = isp1760_register(&dev->resource[3], dev->irq, IRQF_SHARED,

			       &dev->dev, devflags);

	if (ret < 0)

		goto error;



cleanup2:

	iounmap(iobase);

cleanup1:

	release_mem_region(nxp_pci_io_base, iolength);

	return ret_status;

	return 0;



error:

	pci_disable_device(dev);

	return ret;

}



static void isp1761_pci_remove(struct pci_dev *dev)