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 18 static int __devinit pata_of_platform_probe(struct platform_device *ofdev) 19 { 20 int ret; 21 struct device_node *dn = ofdev->dev.of_node; 22 struct resource io_res; 23 struct resource ctl_res; 24 struct resource *irq_res; 25 unsigned int reg_shift = 0; 26 int pio_mode = 0; 27 int pio_mask; 28 const u32 *prop; 29 30 ret = of_address_to_resource(dn, 0, &io_res); 31 if (ret) { 32 dev_err(&ofdev->dev, "can't get IO address from " 33 "device tree\n"); 34 return -EINVAL; 35 } 36 37 if (of_device_is_compatible(dn, "electra-ide")) { 38 /* Altstatus is really at offset 0x3f6 from the primary window 39 * on electra-ide. Adjust ctl_res and io_res accordingly. 40 */ 41 ctl_res = io_res; 42 ctl_res.start = ctl_res.start+0x3f6; 43 io_res.end = ctl_res.start-1; 44 } else { 45 ret = of_address_to_resource(dn, 1, &ctl_res); 46 if (ret) { 47 dev_err(&ofdev->dev, "can't get CTL address from " 48 "device tree\n"); 49 return -EINVAL; 50 } 51 } 52 53 irq_res = platform_get_resource(ofdev, IORESOURCE_IRQ, 0); 54 if (irq_res) 55 irq_res->flags = 0; 56 57 prop = of_get_property(dn, "reg-shift", NULL); 58 if (prop) 59 reg_shift = be32_to_cpup(prop); 60 61 prop = of_get_property(dn, "pio-mode", NULL); 62 if (prop) { 63 pio_mode = be32_to_cpup(prop); 64 if (pio_mode > 6) { 65 dev_err(&ofdev->dev, "invalid pio-mode\n"); 66 return -EINVAL; 67 } 68 } else { 69 dev_info(&ofdev->dev, "pio-mode unspecified, assuming PIO0\n"); 70 } 71 72 pio_mask = 1 << pio_mode; 73 pio_mask |= (1 << pio_mode) - 1; 74 75 return __pata_platform_probe(&ofdev->dev, &io_res, &ctl_res, irq_res, 76 reg_shift, pio_mask); 77 } 78 79 static int __devexit pata_of_platform_remove(struct platform_device *ofdev) 80 { 81 return __pata_platform_remove(&ofdev->dev); 82 } 83 84 static struct of_device_id pata_of_platform_match[] = { 85 { .compatible = "ata-generic", }, 86 { .compatible = "electra-ide", }, 87 {}, 88 }; 89 MODULE_DEVICE_TABLE(of, pata_of_platform_match); 90 91 static struct platform_driver pata_of_platform_driver = { 92 .driver = { 93 .name = "pata_of_platform", 94 .owner = THIS_MODULE, 95 .of_match_table = pata_of_platform_match, 96 }, 97 .probe = pata_of_platform_probe, 98 .remove = __devexit_p(pata_of_platform_remove), 99 }; 100 101 module_platform_driver(pata_of_platform_driver); 102 103 MODULE_DESCRIPTION("OF-platform PATA driver"); 104 MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>"); 105 MODULE_LICENSE("GPL"); 106