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/of_irq.h> 16 #include <linux/of_platform.h> 17 #include <linux/ata_platform.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 ret = of_irq_to_resource(dn, 0, &irq_res); 55 if (!ret) 56 irq_res.start = irq_res.end = 0; 57 else 58 irq_res.flags = 0; 59 60 prop = of_get_property(dn, "reg-shift", NULL); 61 if (prop) 62 reg_shift = be32_to_cpup(prop); 63 64 prop = of_get_property(dn, "pio-mode", NULL); 65 if (prop) { 66 pio_mode = be32_to_cpup(prop); 67 if (pio_mode > 6) { 68 dev_err(&ofdev->dev, "invalid pio-mode\n"); 69 return -EINVAL; 70 } 71 } else { 72 dev_info(&ofdev->dev, "pio-mode unspecified, assuming PIO0\n"); 73 } 74 75 pio_mask = 1 << pio_mode; 76 pio_mask |= (1 << pio_mode) - 1; 77 78 return __pata_platform_probe(&ofdev->dev, &io_res, &ctl_res, &irq_res, 79 reg_shift, pio_mask); 80 } 81 82 static int __devexit pata_of_platform_remove(struct platform_device *ofdev) 83 { 84 return __pata_platform_remove(&ofdev->dev); 85 } 86 87 static struct of_device_id pata_of_platform_match[] = { 88 { .compatible = "ata-generic", }, 89 { .compatible = "electra-ide", }, 90 {}, 91 }; 92 MODULE_DEVICE_TABLE(of, pata_of_platform_match); 93 94 static struct platform_driver pata_of_platform_driver = { 95 .driver = { 96 .name = "pata_of_platform", 97 .owner = THIS_MODULE, 98 .of_match_table = pata_of_platform_match, 99 }, 100 .probe = pata_of_platform_probe, 101 .remove = __devexit_p(pata_of_platform_remove), 102 }; 103 104 static int __init pata_of_platform_init(void) 105 { 106 return platform_driver_register(&pata_of_platform_driver); 107 } 108 module_init(pata_of_platform_init); 109 110 static void __exit pata_of_platform_exit(void) 111 { 112 platform_driver_unregister(&pata_of_platform_driver); 113 } 114 module_exit(pata_of_platform_exit); 115 116 MODULE_DESCRIPTION("OF-platform PATA driver"); 117 MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>"); 118 MODULE_LICENSE("GPL"); 119