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authorDarren Hart <dvhart@linux.intel.com>2013-02-08 15:20:36 -0800
committerSamuel Ortiz <sameo@linux.intel.com>2013-02-14 00:26:45 +0100
commit5829e9b64e657560e840dc0ecfee177cb002cd69 (patch)
tree282ef54b0edf1c087abe14374ac69132cfdbc612 /drivers/mfd/lpc_sch.c
parentc3e9e6b67db23ae678550f861b5679880481cfa3 (diff)
downloadlinux-5829e9b64e657560e840dc0ecfee177cb002cd69.tar.gz
mfd: lpc_sch: Accomodate partial population of the MFD devices
The current probe aborts if any of the 3 base address registers are disabled. On a TunnelCreek system I am working on, this resulted in the SMBIOS and GPIO devices being removed when it couldn't read the base address for the watchdog timer. This patch accommodates partial population of the lpc_sch_cells array and only aborts if all the base address registers are disabled. A max size array is allocated and the individual device cells are added to it after their base addresses are successfully determined. This simplifies the code a bit by removing the need for the separate tunnelcreek cells array and combining some of the add/remove logic. Cc: Grant Likely <grant.likely@secretlab.ca>, Cc: Denis Turischev <denis@compulab.co.il>, Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Cc: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Darren Hart <dvhart@linux.intel.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Diffstat (limited to 'drivers/mfd/lpc_sch.c')
-rw-r--r--drivers/mfd/lpc_sch.c147
1 files changed, 71 insertions, 76 deletions
diff --git a/drivers/mfd/lpc_sch.c b/drivers/mfd/lpc_sch.c
index 5624fcbba69..8cc6aac27cb 100644
--- a/drivers/mfd/lpc_sch.c
+++ b/drivers/mfd/lpc_sch.c
@@ -45,34 +45,32 @@ static struct resource smbus_sch_resource = {
.flags = IORESOURCE_IO,
};
-
static struct resource gpio_sch_resource = {
.flags = IORESOURCE_IO,
};
-static struct mfd_cell lpc_sch_cells[] = {
- {
- .name = "isch_smbus",
- .num_resources = 1,
- .resources = &smbus_sch_resource,
- },
- {
- .name = "sch_gpio",
- .num_resources = 1,
- .resources = &gpio_sch_resource,
- },
-};
-
static struct resource wdt_sch_resource = {
.flags = IORESOURCE_IO,
};
-static struct mfd_cell tunnelcreek_cells[] = {
- {
- .name = "ie6xx_wdt",
- .num_resources = 1,
- .resources = &wdt_sch_resource,
- },
+static struct mfd_cell lpc_sch_cells[3];
+
+static struct mfd_cell isch_smbus_cell = {
+ .name = "isch_smbus",
+ .num_resources = 1,
+ .resources = &smbus_sch_resource,
+};
+
+static struct mfd_cell sch_gpio_cell = {
+ .name = "sch_gpio",
+ .num_resources = 1,
+ .resources = &gpio_sch_resource,
+};
+
+static struct mfd_cell wdt_sch_cell = {
+ .name = "ie6xx_wdt",
+ .num_resources = 1,
+ .resources = &wdt_sch_resource,
};
static DEFINE_PCI_DEVICE_TABLE(lpc_sch_ids) = {
@@ -88,79 +86,76 @@ static int lpc_sch_probe(struct pci_dev *dev,
{
unsigned int base_addr_cfg;
unsigned short base_addr;
- int i;
+ int i, cells = 0;
int ret;
pci_read_config_dword(dev, SMBASE, &base_addr_cfg);
- if (!(base_addr_cfg & (1 << 31))) {
- dev_err(&dev->dev, "Decode of the SMBus I/O range disabled\n");
- return -ENODEV;
- }
- base_addr = (unsigned short)base_addr_cfg;
- if (base_addr == 0) {
- dev_err(&dev->dev, "I/O space for SMBus uninitialized\n");
- return -ENODEV;
- }
-
- smbus_sch_resource.start = base_addr;
- smbus_sch_resource.end = base_addr + SMBUS_IO_SIZE - 1;
+ base_addr = 0;
+ if (!(base_addr_cfg & (1 << 31)))
+ dev_warn(&dev->dev, "Decode of the SMBus I/O range disabled\n");
+ else
+ base_addr = (unsigned short)base_addr_cfg;
- pci_read_config_dword(dev, GPIOBASE, &base_addr_cfg);
- if (!(base_addr_cfg & (1 << 31))) {
- dev_err(&dev->dev, "Decode of the GPIO I/O range disabled\n");
- return -ENODEV;
- }
- base_addr = (unsigned short)base_addr_cfg;
if (base_addr == 0) {
- dev_err(&dev->dev, "I/O space for GPIO uninitialized\n");
- return -ENODEV;
+ dev_warn(&dev->dev, "I/O space for SMBus uninitialized\n");
+ } else {
+ lpc_sch_cells[cells++] = isch_smbus_cell;
+ smbus_sch_resource.start = base_addr;
+ smbus_sch_resource.end = base_addr + SMBUS_IO_SIZE - 1;
}
- gpio_sch_resource.start = base_addr;
-
- if (id->device == PCI_DEVICE_ID_INTEL_CENTERTON_ILB)
- gpio_sch_resource.end = base_addr + GPIO_IO_SIZE_CENTERTON - 1;
+ pci_read_config_dword(dev, GPIOBASE, &base_addr_cfg);
+ base_addr = 0;
+ if (!(base_addr_cfg & (1 << 31)))
+ dev_warn(&dev->dev, "Decode of the GPIO I/O range disabled\n");
else
- gpio_sch_resource.end = base_addr + GPIO_IO_SIZE - 1;
-
- for (i=0; i < ARRAY_SIZE(lpc_sch_cells); i++)
- lpc_sch_cells[i].id = id->device;
+ base_addr = (unsigned short)base_addr_cfg;
- ret = mfd_add_devices(&dev->dev, 0,
- lpc_sch_cells, ARRAY_SIZE(lpc_sch_cells), NULL,
- 0, NULL);
- if (ret)
- goto out_dev;
+ if (base_addr == 0) {
+ dev_warn(&dev->dev, "I/O space for GPIO uninitialized\n");
+ } else {
+ lpc_sch_cells[cells++] = sch_gpio_cell;
+ gpio_sch_resource.start = base_addr;
+ if (id->device == PCI_DEVICE_ID_INTEL_CENTERTON_ILB)
+ gpio_sch_resource.end = base_addr + GPIO_IO_SIZE_CENTERTON - 1;
+ else
+ gpio_sch_resource.end = base_addr + GPIO_IO_SIZE - 1;
+ }
if (id->device == PCI_DEVICE_ID_INTEL_ITC_LPC
- || id->device == PCI_DEVICE_ID_INTEL_CENTERTON_ILB) {
+ || id->device == PCI_DEVICE_ID_INTEL_CENTERTON_ILB) {
pci_read_config_dword(dev, WDTBASE, &base_addr_cfg);
- if (!(base_addr_cfg & (1 << 31))) {
- dev_err(&dev->dev, "Decode of the WDT I/O range disabled\n");
- ret = -ENODEV;
- goto out_dev;
+ base_addr = 0;
+ if (!(base_addr_cfg & (1 << 31)))
+ dev_warn(&dev->dev, "Decode of the WDT I/O range disabled\n");
+ else
+ base_addr = (unsigned short)base_addr_cfg;
+ if (base_addr == 0)
+ dev_warn(&dev->dev, "I/O space for WDT uninitialized\n");
+ else {
+ lpc_sch_cells[cells++] = wdt_sch_cell;
+ wdt_sch_resource.start = base_addr;
+ wdt_sch_resource.end = base_addr + WDT_IO_SIZE - 1;
}
- base_addr = (unsigned short)base_addr_cfg;
- if (base_addr == 0) {
- dev_err(&dev->dev, "I/O space for WDT uninitialized\n");
- ret = -ENODEV;
- goto out_dev;
- }
-
- wdt_sch_resource.start = base_addr;
- wdt_sch_resource.end = base_addr + WDT_IO_SIZE - 1;
+ }
- for (i = 0; i < ARRAY_SIZE(tunnelcreek_cells); i++)
- tunnelcreek_cells[i].id = id->device;
+ if (WARN_ON(cells > ARRAY_SIZE(lpc_sch_cells))) {
+ dev_err(&dev->dev, "Cell count exceeds array size");
+ return -ENODEV;
+ }
- ret = mfd_add_devices(&dev->dev, 0, tunnelcreek_cells,
- ARRAY_SIZE(tunnelcreek_cells), NULL,
- 0, NULL);
+ if (cells == 0) {
+ dev_err(&dev->dev, "All decode registers disabled.\n");
+ return -ENODEV;
}
- return ret;
-out_dev:
- mfd_remove_devices(&dev->dev);
+ for (i = 0; i < cells; i++)
+ lpc_sch_cells[i].id = id->device;
+
+ ret = mfd_add_devices(&dev->dev, 0, lpc_sch_cells, cells, NULL, 0, NULL);
+ if (ret)
+ mfd_remove_devices(&dev->dev);
+
return ret;
}