cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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pata_rb532_cf.c (4626B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 *  A low-level PATA driver to handle a Compact Flash connected on the
      4 *  Mikrotik's RouterBoard 532 board.
      5 *
      6 *  Copyright (C) 2007 Gabor Juhos <juhosg at openwrt.org>
      7 *  Copyright (C) 2008 Florian Fainelli <florian@openwrt.org>
      8 *
      9 *  This file was based on: drivers/ata/pata_ixp4xx_cf.c
     10 *	Copyright (C) 2006-07 Tower Technologies
     11 *	Author: Alessandro Zummo <a.zummo@towertech.it>
     12 *
     13 *  Also was based on the driver for Linux 2.4.xx published by Mikrotik for
     14 *  their RouterBoard 1xx and 5xx series devices. The original Mikrotik code
     15 *  seems not to have a license.
     16 */
     17
     18#include <linux/gfp.h>
     19#include <linux/kernel.h>
     20#include <linux/module.h>
     21#include <linux/platform_device.h>
     22
     23#include <linux/io.h>
     24#include <linux/interrupt.h>
     25#include <linux/irq.h>
     26#include <linux/gpio/consumer.h>
     27
     28#include <linux/libata.h>
     29#include <scsi/scsi_host.h>
     30
     31#include <asm/mach-rc32434/rb.h>
     32
     33#define DRV_NAME	"pata-rb532-cf"
     34#define DRV_VERSION	"0.1.0"
     35#define DRV_DESC	"PATA driver for RouterBOARD 532 Compact Flash"
     36
     37#define RB500_CF_MAXPORTS	1
     38#define RB500_CF_IO_DELAY	400
     39
     40#define RB500_CF_REG_BASE	0x0800
     41#define RB500_CF_REG_ERR	0x080D
     42#define RB500_CF_REG_CTRL	0x080E
     43/* 32bit buffered data register offset */
     44#define RB500_CF_REG_DBUF32	0x0C00
     45
     46struct rb532_cf_info {
     47	void __iomem	*iobase;
     48	struct gpio_desc *gpio_line;
     49	unsigned int	irq;
     50};
     51
     52/* ------------------------------------------------------------------------ */
     53
     54static irqreturn_t rb532_pata_irq_handler(int irq, void *dev_instance)
     55{
     56	struct ata_host *ah = dev_instance;
     57	struct rb532_cf_info *info = ah->private_data;
     58
     59	if (gpiod_get_value(info->gpio_line)) {
     60		irq_set_irq_type(info->irq, IRQ_TYPE_LEVEL_LOW);
     61		ata_sff_interrupt(info->irq, dev_instance);
     62	} else {
     63		irq_set_irq_type(info->irq, IRQ_TYPE_LEVEL_HIGH);
     64	}
     65
     66	return IRQ_HANDLED;
     67}
     68
     69static struct ata_port_operations rb532_pata_port_ops = {
     70	.inherits		= &ata_sff_port_ops,
     71	.sff_data_xfer		= ata_sff_data_xfer32,
     72};
     73
     74/* ------------------------------------------------------------------------ */
     75
     76static struct scsi_host_template rb532_pata_sht = {
     77	ATA_PIO_SHT(DRV_NAME),
     78};
     79
     80/* ------------------------------------------------------------------------ */
     81
     82static void rb532_pata_setup_ports(struct ata_host *ah)
     83{
     84	struct rb532_cf_info *info = ah->private_data;
     85	struct ata_port *ap;
     86
     87	ap = ah->ports[0];
     88
     89	ap->ops		= &rb532_pata_port_ops;
     90	ap->pio_mask	= ATA_PIO4;
     91
     92	ap->ioaddr.cmd_addr	= info->iobase + RB500_CF_REG_BASE;
     93	ap->ioaddr.ctl_addr	= info->iobase + RB500_CF_REG_CTRL;
     94	ap->ioaddr.altstatus_addr = info->iobase + RB500_CF_REG_CTRL;
     95
     96	ata_sff_std_ports(&ap->ioaddr);
     97
     98	ap->ioaddr.data_addr	= info->iobase + RB500_CF_REG_DBUF32;
     99	ap->ioaddr.error_addr	= info->iobase + RB500_CF_REG_ERR;
    100}
    101
    102static int rb532_pata_driver_probe(struct platform_device *pdev)
    103{
    104	int irq;
    105	struct gpio_desc *gpiod;
    106	struct resource *res;
    107	struct ata_host *ah;
    108	struct rb532_cf_info *info;
    109	int ret;
    110
    111	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
    112	if (!res) {
    113		dev_err(&pdev->dev, "no IOMEM resource found\n");
    114		return -EINVAL;
    115	}
    116
    117	irq = platform_get_irq(pdev, 0);
    118	if (irq < 0)
    119		return irq;
    120	if (!irq)
    121		return -EINVAL;
    122
    123	gpiod = devm_gpiod_get(&pdev->dev, NULL, GPIOD_IN);
    124	if (IS_ERR(gpiod)) {
    125		dev_err(&pdev->dev, "no GPIO found for irq%d\n", irq);
    126		return PTR_ERR(gpiod);
    127	}
    128	gpiod_set_consumer_name(gpiod, DRV_NAME);
    129
    130	/* allocate host */
    131	ah = ata_host_alloc(&pdev->dev, RB500_CF_MAXPORTS);
    132	if (!ah)
    133		return -ENOMEM;
    134
    135	info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
    136	if (!info)
    137		return -ENOMEM;
    138
    139	ah->private_data = info;
    140	info->gpio_line = gpiod;
    141	info->irq = irq;
    142
    143	info->iobase = devm_ioremap(&pdev->dev, res->start,
    144				resource_size(res));
    145	if (!info->iobase)
    146		return -ENOMEM;
    147
    148	rb532_pata_setup_ports(ah);
    149
    150	ret = ata_host_activate(ah, irq, rb532_pata_irq_handler,
    151				IRQF_TRIGGER_LOW, &rb532_pata_sht);
    152	if (ret)
    153		return ret;
    154
    155	return 0;
    156}
    157
    158static int rb532_pata_driver_remove(struct platform_device *pdev)
    159{
    160	struct ata_host *ah = platform_get_drvdata(pdev);
    161
    162	ata_host_detach(ah);
    163
    164	return 0;
    165}
    166
    167static struct platform_driver rb532_pata_platform_driver = {
    168	.probe		= rb532_pata_driver_probe,
    169	.remove		= rb532_pata_driver_remove,
    170	.driver	 = {
    171		.name   = DRV_NAME,
    172	},
    173};
    174
    175#define DRV_INFO DRV_DESC " version " DRV_VERSION
    176
    177module_platform_driver(rb532_pata_platform_driver);
    178
    179MODULE_AUTHOR("Gabor Juhos <juhosg at openwrt.org>");
    180MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
    181MODULE_DESCRIPTION(DRV_DESC);
    182MODULE_VERSION(DRV_VERSION);
    183MODULE_LICENSE("GPL");
    184MODULE_ALIAS("platform:" DRV_NAME);