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 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 ret = of_address_to_resource(dn, 1, &ctl_res); 39 if (ret) { 40 dev_err(&ofdev->dev, "can't get CTL address from " 41 "device tree\n"); 42 return -EINVAL; 43 } 44 45 irq_res = platform_get_resource(ofdev, IORESOURCE_IRQ, 0); 46 47 prop = of_get_property(dn, "reg-shift", NULL); 48 if (prop) 49 reg_shift = be32_to_cpup(prop); 50 51 prop = of_get_property(dn, "pio-mode", NULL); 52 if (prop) { 53 pio_mode = be32_to_cpup(prop); 54 if (pio_mode > 6) { 55 dev_err(&ofdev->dev, "invalid pio-mode\n"); 56 return -EINVAL; 57 } 58 } else { 59 dev_info(&ofdev->dev, "pio-mode unspecified, assuming PIO0\n"); 60 } 61 62 pio_mask = 1 << pio_mode; 63 pio_mask |= (1 << pio_mode) - 1; 64 65 return __pata_platform_probe(&ofdev->dev, &io_res, &ctl_res, irq_res, 66 reg_shift, pio_mask); 67 } 68 69 static struct of_device_id pata_of_platform_match[] = { 70 { .compatible = "ata-generic", }, 71 { }, 72 }; 73 MODULE_DEVICE_TABLE(of, pata_of_platform_match); 74 75 static struct platform_driver pata_of_platform_driver = { 76 .driver = { 77 .name = "pata_of_platform", 78 .of_match_table = pata_of_platform_match, 79 }, 80 .probe = pata_of_platform_probe, 81 .remove = ata_platform_remove_one, 82 }; 83 84 module_platform_driver(pata_of_platform_driver); 85 86 MODULE_DESCRIPTION("OF-platform PATA driver"); 87 MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>"); 88 MODULE_LICENSE("GPL"); 89