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184 lines
4.5 KiB
184 lines
4.5 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* A low-level PATA driver to handle a Compact Flash connected on the |
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* Mikrotik's RouterBoard 532 board. |
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* |
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* Copyright (C) 2007 Gabor Juhos <juhosg at openwrt.org> |
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* Copyright (C) 2008 Florian Fainelli <[email protected]> |
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* |
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* This file was based on: drivers/ata/pata_ixp4xx_cf.c |
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* Copyright (C) 2006-07 Tower Technologies |
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* Author: Alessandro Zummo <[email protected]> |
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* |
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* Also was based on the driver for Linux 2.4.xx published by Mikrotik for |
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* their RouterBoard 1xx and 5xx series devices. The original Mikrotik code |
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* seems not to have a license. |
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*/ |
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#include <linux/gfp.h> |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/platform_device.h> |
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#include <linux/io.h> |
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#include <linux/interrupt.h> |
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#include <linux/irq.h> |
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#include <linux/gpio/consumer.h> |
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#include <linux/libata.h> |
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#include <scsi/scsi_host.h> |
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#include <asm/mach-rc32434/rb.h> |
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#define DRV_NAME "pata-rb532-cf" |
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#define DRV_VERSION "0.1.0" |
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#define DRV_DESC "PATA driver for RouterBOARD 532 Compact Flash" |
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#define RB500_CF_MAXPORTS 1 |
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#define RB500_CF_IO_DELAY 400 |
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#define RB500_CF_REG_BASE 0x0800 |
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#define RB500_CF_REG_ERR 0x080D |
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#define RB500_CF_REG_CTRL 0x080E |
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/* 32bit buffered data register offset */ |
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#define RB500_CF_REG_DBUF32 0x0C00 |
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struct rb532_cf_info { |
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void __iomem *iobase; |
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struct gpio_desc *gpio_line; |
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unsigned int irq; |
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}; |
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/* ------------------------------------------------------------------------ */ |
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static irqreturn_t rb532_pata_irq_handler(int irq, void *dev_instance) |
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{ |
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struct ata_host *ah = dev_instance; |
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struct rb532_cf_info *info = ah->private_data; |
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if (gpiod_get_value(info->gpio_line)) { |
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irq_set_irq_type(info->irq, IRQ_TYPE_LEVEL_LOW); |
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ata_sff_interrupt(info->irq, dev_instance); |
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} else { |
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irq_set_irq_type(info->irq, IRQ_TYPE_LEVEL_HIGH); |
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} |
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return IRQ_HANDLED; |
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} |
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static struct ata_port_operations rb532_pata_port_ops = { |
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.inherits = &ata_sff_port_ops, |
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.sff_data_xfer = ata_sff_data_xfer32, |
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}; |
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/* ------------------------------------------------------------------------ */ |
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static struct scsi_host_template rb532_pata_sht = { |
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ATA_PIO_SHT(DRV_NAME), |
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}; |
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/* ------------------------------------------------------------------------ */ |
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static void rb532_pata_setup_ports(struct ata_host *ah) |
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{ |
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struct rb532_cf_info *info = ah->private_data; |
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struct ata_port *ap; |
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ap = ah->ports[0]; |
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ap->ops = &rb532_pata_port_ops; |
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ap->pio_mask = ATA_PIO4; |
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ap->ioaddr.cmd_addr = info->iobase + RB500_CF_REG_BASE; |
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ap->ioaddr.ctl_addr = info->iobase + RB500_CF_REG_CTRL; |
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ap->ioaddr.altstatus_addr = info->iobase + RB500_CF_REG_CTRL; |
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ata_sff_std_ports(&ap->ioaddr); |
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ap->ioaddr.data_addr = info->iobase + RB500_CF_REG_DBUF32; |
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ap->ioaddr.error_addr = info->iobase + RB500_CF_REG_ERR; |
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} |
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static int rb532_pata_driver_probe(struct platform_device *pdev) |
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{ |
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int irq; |
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struct gpio_desc *gpiod; |
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struct resource *res; |
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struct ata_host *ah; |
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struct rb532_cf_info *info; |
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int ret; |
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
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if (!res) { |
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dev_err(&pdev->dev, "no IOMEM resource found\n"); |
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return -EINVAL; |
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} |
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irq = platform_get_irq(pdev, 0); |
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if (irq < 0) |
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return irq; |
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if (!irq) |
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return -EINVAL; |
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gpiod = devm_gpiod_get(&pdev->dev, NULL, GPIOD_IN); |
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if (IS_ERR(gpiod)) { |
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dev_err(&pdev->dev, "no GPIO found for irq%d\n", irq); |
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return PTR_ERR(gpiod); |
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} |
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gpiod_set_consumer_name(gpiod, DRV_NAME); |
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/* allocate host */ |
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ah = ata_host_alloc(&pdev->dev, RB500_CF_MAXPORTS); |
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if (!ah) |
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return -ENOMEM; |
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info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL); |
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if (!info) |
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return -ENOMEM; |
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ah->private_data = info; |
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info->gpio_line = gpiod; |
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info->irq = irq; |
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info->iobase = devm_ioremap(&pdev->dev, res->start, |
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resource_size(res)); |
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if (!info->iobase) |
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return -ENOMEM; |
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rb532_pata_setup_ports(ah); |
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ret = ata_host_activate(ah, irq, rb532_pata_irq_handler, |
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IRQF_TRIGGER_LOW, &rb532_pata_sht); |
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if (ret) |
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return ret; |
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return 0; |
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} |
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static int rb532_pata_driver_remove(struct platform_device *pdev) |
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{ |
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struct ata_host *ah = platform_get_drvdata(pdev); |
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ata_host_detach(ah); |
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return 0; |
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} |
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static struct platform_driver rb532_pata_platform_driver = { |
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.probe = rb532_pata_driver_probe, |
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.remove = rb532_pata_driver_remove, |
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.driver = { |
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.name = DRV_NAME, |
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}, |
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}; |
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#define DRV_INFO DRV_DESC " version " DRV_VERSION |
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module_platform_driver(rb532_pata_platform_driver); |
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MODULE_AUTHOR("Gabor Juhos <juhosg at openwrt.org>"); |
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MODULE_AUTHOR("Florian Fainelli <[email protected]>"); |
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MODULE_DESCRIPTION(DRV_DESC); |
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MODULE_VERSION(DRV_VERSION); |
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MODULE_LICENSE("GPL"); |
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MODULE_ALIAS("platform:" DRV_NAME);
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