1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * OF-platform PATA driver 4 * 5 * Copyright (c) 2007 MontaVista Software, Inc. 6 * Anton Vorontsov <avorontsov@ru.mvista.com> 7 */ 8 9 #include <linux/kernel.h> 10 #include <linux/module.h> 11 #include <linux/of_address.h> 12 #include <linux/platform_device.h> 13 #include <linux/ata_platform.h> 14 #include <linux/libata.h> 15 16 #define DRV_NAME "pata_of_platform" 17 18 static struct scsi_host_template pata_platform_sht = { 19 ATA_PIO_SHT(DRV_NAME), 20 }; 21 22 static int pata_of_platform_probe(struct platform_device *ofdev) 23 { 24 int ret; 25 struct device_node *dn = ofdev->dev.of_node; 26 struct resource io_res; 27 struct resource ctl_res; 28 struct resource irq_res; 29 unsigned int reg_shift = 0; 30 int pio_mode = 0; 31 int pio_mask; 32 bool use16bit; 33 int irq; 34 35 ret = of_address_to_resource(dn, 0, &io_res); 36 if (ret) { 37 dev_err(&ofdev->dev, "can't get IO address from " 38 "device tree\n"); 39 return -EINVAL; 40 } 41 42 ret = of_address_to_resource(dn, 1, &ctl_res); 43 if (ret) { 44 dev_err(&ofdev->dev, "can't get CTL address from " 45 "device tree\n"); 46 return -EINVAL; 47 } 48 49 memset(&irq_res, 0, sizeof(irq_res)); 50 51 irq = platform_get_irq_optional(ofdev, 0); 52 if (irq < 0 && irq != -ENXIO) 53 return irq; 54 if (irq > 0) { 55 irq_res.start = irq; 56 irq_res.end = irq; 57 } 58 59 of_property_read_u32(dn, "reg-shift", ®_shift); 60 61 if (!of_property_read_u32(dn, "pio-mode", &pio_mode)) { 62 if (pio_mode > 6) { 63 dev_err(&ofdev->dev, "invalid pio-mode\n"); 64 return -EINVAL; 65 } 66 } else { 67 dev_info(&ofdev->dev, "pio-mode unspecified, assuming PIO0\n"); 68 } 69 70 use16bit = of_property_read_bool(dn, "ata-generic,use16bit"); 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 > 0 ? &irq_res : NULL, 76 reg_shift, pio_mask, &pata_platform_sht, 77 use16bit); 78 } 79 80 static const struct of_device_id pata_of_platform_match[] = { 81 { .compatible = "ata-generic", }, 82 { }, 83 }; 84 MODULE_DEVICE_TABLE(of, pata_of_platform_match); 85 86 static struct platform_driver pata_of_platform_driver = { 87 .driver = { 88 .name = DRV_NAME, 89 .of_match_table = pata_of_platform_match, 90 }, 91 .probe = pata_of_platform_probe, 92 .remove = ata_platform_remove_one, 93 }; 94 95 module_platform_driver(pata_of_platform_driver); 96 97 MODULE_DESCRIPTION("OF-platform PATA driver"); 98 MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>"); 99 MODULE_LICENSE("GPL"); 100