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USB: isp1760: Fix probe in PCI glue code

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Contains fixes so probe on x86 PCI runs, apparently I'm first to try
this. Several fixes to memory access to probe host scratch register.
Previously would bug check on chip_addr var used uninitialized.
Scratch reg write failed in one instance due to 16-bit initial access
mode, so added "& 0x0000ffff" to the readl as fix.
Includes some general cleanup - remove global vars, organize memory map
resource use.

Signed-off-by: Karl Bongers <kbongers@jged.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Karl Bongers 2008-12-01 11:47:40 +01:00 committed by Greg Kroah-Hartman
parent 6c0735687d
commit 6013bbbab0
1 changed files with 55 additions and 42 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

97
drivers/usb/host/isp1760-if.c
View File

@ -129,23 +129,23 @@ static struct of_platform_driver isp1760_of_driver = {
#endif
#ifdef CONFIG_PCI
static u32 nxp_pci_io_base;
static u32 iolength;
static u32 pci_mem_phy0;
static u32 length;
static u8 __iomem *chip_addr;
static u8 __iomem *iobase;
static int __devinit isp1761_pci_probe(struct pci_dev *dev,
const struct pci_device_id *id)
{
u8 latency, limit;
__u32 reg_data;
int retry_count;
int length;
int status = 1;
struct usb_hcd *hcd;
unsigned int devflags = 0;
int ret_status = 0;
resource_size_t pci_mem_phy0;
resource_size_t memlength;
u8 __iomem *chip_addr;
u8 __iomem *iobase;
resource_size_t nxp_pci_io_base;
resource_size_t iolength;
if (usb_disabled())
return -ENODEV;
@ -168,26 +168,30 @@ static int __devinit isp1761_pci_probe(struct pci_dev *dev,
iobase = ioremap_nocache(nxp_pci_io_base, iolength);
if (!iobase) {
printk(KERN_ERR "ioremap #1\n");
release_mem_region(nxp_pci_io_base, iolength);
return -ENOMEM;
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);
length = pci_resource_len(dev, 3);
if (length < 0xffff) {
printk(KERN_ERR "memory length for this resource is less than "
"required\n");
release_mem_region(nxp_pci_io_base, iolength);
iounmap(iobase);
return -ENOMEM;
memlength = pci_resource_len(dev, 3);
if (memlength < 0xffff) {
printk(KERN_ERR "memory length for this resource is wrong\n");
ret_status = -ENOMEM;
goto cleanup2;
}
if (!request_mem_region(pci_mem_phy0, length, "ISP-PCI")) {
if (!request_mem_region(pci_mem_phy0, memlength, "ISP-PCI")) {
printk(KERN_ERR "host controller already in use\n");
release_mem_region(nxp_pci_io_base, iolength);
iounmap(iobase);
return -EBUSY;
ret_status = -EBUSY;
goto cleanup2;
}
/* map available memory */
chip_addr = ioremap_nocache(pci_mem_phy0,memlength);
if (!chip_addr) {
printk(KERN_ERR "Error ioremap failed\n");
ret_status = -ENOMEM;
goto cleanup3;
}
/* bad pci latencies can contribute to overruns */
@ -210,39 +214,54 @@ static int __devinit isp1761_pci_probe(struct pci_dev *dev,
* */
writel(0xface, chip_addr + HC_SCRATCH_REG);
udelay(100);
reg_data = readl(chip_addr + HC_SCRATCH_REG);
reg_data = readl(chip_addr + HC_SCRATCH_REG) & 0x0000ffff;
retry_count--;
}
iounmap(chip_addr);
/* 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);
goto clean;
ret_status = -ENOMEM;
goto cleanup3;
}
pci_set_master(dev);
status = readl(iobase + 0x68);
status |= 0x900;
writel(status, iobase + 0x68);
/* configure PLX PCI chip to pass interrupts */
#define PLX_INT_CSR_REG 0x68
reg_data = readl(iobase + PLX_INT_CSR_REG);
reg_data |= 0x900;
writel(reg_data, iobase + PLX_INT_CSR_REG);
dev->dev.dma_mask = NULL;
hcd = isp1760_register(pci_mem_phy0, length, dev->irq,
hcd = isp1760_register(pci_mem_phy0, memlength, dev->irq,
IRQF_SHARED | IRQF_DISABLED, &dev->dev, dev_name(&dev->dev),
devflags);
if (!IS_ERR(hcd)) {
pci_set_drvdata(dev, hcd);
return 0;
if (IS_ERR(hcd)) {
ret_status = -ENODEV;
goto cleanup3;
}
clean:
status = -ENODEV;
/* done with PLX IO access */
iounmap(iobase);
release_mem_region(pci_mem_phy0, length);
release_mem_region(nxp_pci_io_base, iolength);
return status;
pci_set_drvdata(dev, hcd);
return 0;
cleanup3:
release_mem_region(pci_mem_phy0, memlength);
cleanup2:
iounmap(iobase);
cleanup1:
release_mem_region(nxp_pci_io_base, iolength);
return ret_status;
}
static void isp1761_pci_remove(struct pci_dev *dev)
{
struct usb_hcd *hcd;
@ -255,12 +274,6 @@ static void isp1761_pci_remove(struct pci_dev *dev)
usb_put_hcd(hcd);
pci_disable_device(dev);
iounmap(iobase);
iounmap(chip_addr);
release_mem_region(nxp_pci_io_base, iolength);
release_mem_region(pci_mem_phy0, length);
}
static void isp1761_pci_shutdown(struct pci_dev *dev)