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| 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 |
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Tags:
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