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8bcf6135c3
Replace spinlocks guarding gpio config ops with mutexes. This is a me-too patch, and is justifiable insofar as mutexes have stricter semantics and better debugging support, so are preferred where they are applicable. Signed-off-by: Jim Cromie <jim.cromie@gmail.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
133 lines
3.3 KiB
C
133 lines
3.3 KiB
C
/* linux/arch/i386/kernel/scx200.c
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Copyright (c) 2001,2002 Christer Weinigel <wingel@nano-system.com>
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National Semiconductor SCx200 support. */
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#include <linux/config.h>
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/mutex.h>
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#include <linux/pci.h>
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#include <linux/scx200.h>
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#include <linux/scx200_gpio.h>
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/* Verify that the configuration block really is there */
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#define scx200_cb_probe(base) (inw((base) + SCx200_CBA) == (base))
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#define NAME "scx200"
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MODULE_AUTHOR("Christer Weinigel <wingel@nano-system.com>");
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MODULE_DESCRIPTION("NatSemi SCx200 Driver");
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MODULE_LICENSE("GPL");
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unsigned scx200_gpio_base = 0;
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long scx200_gpio_shadow[2];
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unsigned scx200_cb_base = 0;
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static struct pci_device_id scx200_tbl[] = {
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{ PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_SCx200_BRIDGE) },
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{ PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_SC1100_BRIDGE) },
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{ PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_SCx200_XBUS) },
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{ PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_SC1100_XBUS) },
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{ },
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};
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MODULE_DEVICE_TABLE(pci,scx200_tbl);
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static int __devinit scx200_probe(struct pci_dev *, const struct pci_device_id *);
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static struct pci_driver scx200_pci_driver = {
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.name = "scx200",
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.id_table = scx200_tbl,
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.probe = scx200_probe,
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};
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static DEFINE_MUTEX(scx200_gpio_config_lock);
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static void __devinit scx200_init_shadow(void)
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{
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int bank;
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/* read the current values driven on the GPIO signals */
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for (bank = 0; bank < 2; ++bank)
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scx200_gpio_shadow[bank] = inl(scx200_gpio_base + 0x10 * bank);
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}
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static int __devinit scx200_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
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{
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unsigned base;
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if (pdev->device == PCI_DEVICE_ID_NS_SCx200_BRIDGE ||
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pdev->device == PCI_DEVICE_ID_NS_SC1100_BRIDGE) {
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base = pci_resource_start(pdev, 0);
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printk(KERN_INFO NAME ": GPIO base 0x%x\n", base);
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if (request_region(base, SCx200_GPIO_SIZE, "NatSemi SCx200 GPIO") == 0) {
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printk(KERN_ERR NAME ": can't allocate I/O for GPIOs\n");
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return -EBUSY;
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}
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scx200_gpio_base = base;
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scx200_init_shadow();
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} else {
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/* find the base of the Configuration Block */
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if (scx200_cb_probe(SCx200_CB_BASE_FIXED)) {
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scx200_cb_base = SCx200_CB_BASE_FIXED;
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} else {
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pci_read_config_dword(pdev, SCx200_CBA_SCRATCH, &base);
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if (scx200_cb_probe(base)) {
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scx200_cb_base = base;
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} else {
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printk(KERN_WARNING NAME ": Configuration Block not found\n");
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return -ENODEV;
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}
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}
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printk(KERN_INFO NAME ": Configuration Block base 0x%x\n", scx200_cb_base);
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}
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return 0;
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}
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u32 scx200_gpio_configure(unsigned index, u32 mask, u32 bits)
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{
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u32 config, new_config;
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mutex_lock(&scx200_gpio_config_lock);
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outl(index, scx200_gpio_base + 0x20);
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config = inl(scx200_gpio_base + 0x24);
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new_config = (config & mask) | bits;
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outl(new_config, scx200_gpio_base + 0x24);
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mutex_unlock(&scx200_gpio_config_lock);
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return config;
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}
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static int __init scx200_init(void)
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{
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printk(KERN_INFO NAME ": NatSemi SCx200 Driver\n");
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return pci_register_driver(&scx200_pci_driver);
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}
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static void __exit scx200_cleanup(void)
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{
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pci_unregister_driver(&scx200_pci_driver);
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release_region(scx200_gpio_base, SCx200_GPIO_SIZE);
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}
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module_init(scx200_init);
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module_exit(scx200_cleanup);
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EXPORT_SYMBOL(scx200_gpio_base);
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EXPORT_SYMBOL(scx200_gpio_shadow);
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EXPORT_SYMBOL(scx200_gpio_configure);
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EXPORT_SYMBOL(scx200_cb_base);
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