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9b170b8fdb
Pull shadow-reg initialization into separate function now, rather than doing it 2x later (scx200, pc8736x). When we revisit 2nd drvr below, it will be to reimplement an init function, rather than another refactor. 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>
149 lines
4.1 KiB
C
149 lines
4.1 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/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_SPINLOCK(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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unsigned long flags;
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spin_lock_irqsave(&scx200_gpio_config_lock, flags);
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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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spin_unlock_irqrestore(&scx200_gpio_config_lock, flags);
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return config;
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}
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void scx200_gpio_dump(unsigned index)
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{
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u32 config = scx200_gpio_configure(index, ~0, 0);
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printk(KERN_INFO NAME ": GPIO-%02u: 0x%08lx %s %s %s %s %s %s %s\n",
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index, (unsigned long) config,
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(config & 1) ? "OE" : "TS", /* output enabled / tristate */
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(config & 2) ? "PP" : "OD", /* push pull / open drain */
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(config & 4) ? "PUE" : "PUD", /* pull up enabled/disabled */
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(config & 8) ? "LOCKED" : "", /* locked / unlocked */
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(config & 16) ? "LEVEL" : "EDGE", /* level/edge input */
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(config & 32) ? "HI" : "LO", /* trigger on rising/falling edge */
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(config & 64) ? "DEBOUNCE" : ""); /* debounce */
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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_gpio_dump);
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EXPORT_SYMBOL(scx200_cb_base);
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