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 #define DRV_NAME "pata_of_platform" 20 21 static struct scsi_host_template pata_platform_sht = { 22 ATA_PIO_SHT(DRV_NAME), 23 }; 24 25 static int pata_of_platform_probe(struct platform_device *ofdev) 26 { 27 int ret; 28 struct device_node *dn = ofdev->dev.of_node; 29 struct resource io_res; 30 struct resource ctl_res; 31 struct resource *irq_res; 32 unsigned int reg_shift = 0; 33 int pio_mode = 0; 34 int pio_mask; 35 bool use16bit; 36 37 ret = of_address_to_resource(dn, 0, &io_res); 38 if (ret) { 39 dev_err(&ofdev->dev, "can't get IO address from " 40 "device tree\n"); 41 return -EINVAL; 42 } 43 44 ret = of_address_to_resource(dn, 1, &ctl_res); 45 if (ret) { 46 dev_err(&ofdev->dev, "can't get CTL address from " 47 "device tree\n"); 48 return -EINVAL; 49 } 50 51 irq_res = platform_get_resource(ofdev, IORESOURCE_IRQ, 0); 52 53 of_property_read_u32(dn, "reg-shift", ®_shift); 54 55 if (!of_property_read_u32(dn, "pio-mode", &pio_mode)) { 56 if (pio_mode > 6) { 57 dev_err(&ofdev->dev, "invalid pio-mode\n"); 58 return -EINVAL; 59 } 60 } else { 61 dev_info(&ofdev->dev, "pio-mode unspecified, assuming PIO0\n"); 62 } 63 64 use16bit = of_property_read_bool(dn, "ata-generic,use16bit"); 65 66 pio_mask = 1 << pio_mode; 67 pio_mask |= (1 << pio_mode) - 1; 68 69 return __pata_platform_probe(&ofdev->dev, &io_res, &ctl_res, irq_res, 70 reg_shift, pio_mask, &pata_platform_sht, 71 use16bit); 72 } 73 74 static const struct of_device_id pata_of_platform_match[] = { 75 { .compatible = "ata-generic", }, 76 { }, 77 }; 78 MODULE_DEVICE_TABLE(of, pata_of_platform_match); 79 80 static struct platform_driver pata_of_platform_driver = { 81 .driver = { 82 .name = DRV_NAME, 83 .of_match_table = pata_of_platform_match, 84 }, 85 .probe = pata_of_platform_probe, 86 .remove = ata_platform_remove_one, 87 }; 88 89 module_platform_driver(pata_of_platform_driver); 90 91 MODULE_DESCRIPTION("OF-platform PATA driver"); 92 MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>"); 93 MODULE_LICENSE("GPL"); 94