cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

pata_of_platform.c (2419B)

      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
     18static 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", &reg_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		= 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");