1 /* 2 * OF-platform PATA driver 3 * 4 * Copyright (c) 2007 MontaVista Software, Inc. 5 * Anton Vorontsov <avorontsov@ru.mvista.com> 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License (Version 2) as 9 * published by the Free Software Foundation. 10 */ 11 12 #include <linux/kernel.h> 13 #include <linux/module.h> 14 #include <linux/of_address.h> 15 #include <linux/platform_device.h> 16 #include <linux/ata_platform.h> 17 #include <linux/libata.h> 18 19 static int __devinit pata_of_platform_probe(struct platform_device *ofdev) 20 { 21 int ret; 22 struct device_node *dn = ofdev->dev.of_node; 23 struct resource io_res; 24 struct resource ctl_res; 25 struct resource *irq_res; 26 unsigned int reg_shift = 0; 27 int pio_mode = 0; 28 int pio_mask; 29 const u32 *prop; 30 31 ret = of_address_to_resource(dn, 0, &io_res); 32 if (ret) { 33 dev_err(&ofdev->dev, "can't get IO address from " 34 "device tree\n"); 35 return -EINVAL; 36 } 37 38 if (of_device_is_compatible(dn, "electra-ide")) { 39 /* Altstatus is really at offset 0x3f6 from the primary window 40 * on electra-ide. Adjust ctl_res and io_res accordingly. 41 */ 42 ctl_res = io_res; 43 ctl_res.start = ctl_res.start+0x3f6; 44 io_res.end = ctl_res.start-1; 45 } else { 46 ret = of_address_to_resource(dn, 1, &ctl_res); 47 if (ret) { 48 dev_err(&ofdev->dev, "can't get CTL address from " 49 "device tree\n"); 50 return -EINVAL; 51 } 52 } 53 54 irq_res = platform_get_resource(ofdev, IORESOURCE_IRQ, 0); 55 if (irq_res) 56 irq_res->flags = 0; 57 58 prop = of_get_property(dn, "reg-shift", NULL); 59 if (prop) 60 reg_shift = be32_to_cpup(prop); 61 62 prop = of_get_property(dn, "pio-mode", NULL); 63 if (prop) { 64 pio_mode = be32_to_cpup(prop); 65 if (pio_mode > 6) { 66 dev_err(&ofdev->dev, "invalid pio-mode\n"); 67 return -EINVAL; 68 } 69 } else { 70 dev_info(&ofdev->dev, "pio-mode unspecified, assuming PIO0\n"); 71 } 72 73 pio_mask = 1 << pio_mode; 74 pio_mask |= (1 << pio_mode) - 1; 75 76 return __pata_platform_probe(&ofdev->dev, &io_res, &ctl_res, irq_res, 77 reg_shift, pio_mask); 78 } 79 80 static struct of_device_id pata_of_platform_match[] = { 81 { .compatible = "ata-generic", }, 82 { .compatible = "electra-ide", }, 83 {}, 84 }; 85 MODULE_DEVICE_TABLE(of, pata_of_platform_match); 86 87 static struct platform_driver pata_of_platform_driver = { 88 .driver = { 89 .name = "pata_of_platform", 90 .owner = THIS_MODULE, 91 .of_match_table = pata_of_platform_match, 92 }, 93 .probe = pata_of_platform_probe, 94 .remove = ata_platform_remove_one, 95 }; 96 97 module_platform_driver(pata_of_platform_driver); 98 99 MODULE_DESCRIPTION("OF-platform PATA driver"); 100 MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>"); 101 MODULE_LICENSE("GPL"); 102