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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * OF-platform PATA driver4 *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 18static const struct scsi_host_template pata_platform_sht = {19 ATA_PIO_SHT(DRV_NAME),20};21 22static 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 80static const struct of_device_id pata_of_platform_match[] = {81 { .compatible = "ata-generic", },82 { /* sentinel */ }83};84MODULE_DEVICE_TABLE(of, pata_of_platform_match);85 86static 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_new = ata_platform_remove_one,93};94 95module_platform_driver(pata_of_platform_driver);96 97MODULE_DESCRIPTION("OF-platform PATA driver");98MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>");99MODULE_LICENSE("GPL");100