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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * A low-level PATA driver to handle a Compact Flash connected on the4 * 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.c10 * Copyright (C) 2006-07 Tower Technologies11 * Author: Alessandro Zummo <a.zummo@towertech.it>12 *13 * Also was based on the driver for Linux 2.4.xx published by Mikrotik for14 * their RouterBoard 1xx and 5xx series devices. The original Mikrotik code15 * 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 138#define RB500_CF_IO_DELAY 40039 40#define RB500_CF_REG_BASE 0x080041#define RB500_CF_REG_ERR 0x080D42#define RB500_CF_REG_CTRL 0x080E43/* 32bit buffered data register offset */44#define RB500_CF_REG_DBUF32 0x0C0045 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 const 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 void 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 165static struct platform_driver rb532_pata_platform_driver = {166 .probe = rb532_pata_driver_probe,167 .remove_new = rb532_pata_driver_remove,168 .driver = {169 .name = DRV_NAME,170 },171};172 173#define DRV_INFO DRV_DESC " version " DRV_VERSION174 175module_platform_driver(rb532_pata_platform_driver);176 177MODULE_AUTHOR("Gabor Juhos <juhosg at openwrt.org>");178MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");179MODULE_DESCRIPTION(DRV_DESC);180MODULE_VERSION(DRV_VERSION);181MODULE_LICENSE("GPL");182MODULE_ALIAS("platform:" DRV_NAME);183