| /* |
| * A low-level PATA driver to handle a Compact Flash connected on the |
| * Mikrotik's RouterBoard 532 board. |
| * |
| * Copyright (C) 2007 Gabor Juhos <juhosg at openwrt.org> |
| * Copyright (C) 2008 Florian Fainelli <florian@openwrt.org> |
| * |
| * This file was based on: drivers/ata/pata_ixp4xx_cf.c |
| * Copyright (C) 2006-07 Tower Technologies |
| * Author: Alessandro Zummo <a.zummo@towertech.it> |
| * |
| * Also was based on the driver for Linux 2.4.xx published by Mikrotik for |
| * their RouterBoard 1xx and 5xx series devices. The original Mikrotik code |
| * seems not to have a license. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| * |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/platform_device.h> |
| |
| #include <linux/io.h> |
| #include <linux/interrupt.h> |
| #include <linux/irq.h> |
| |
| #include <linux/libata.h> |
| #include <scsi/scsi_host.h> |
| |
| #include <asm/gpio.h> |
| |
| #define DRV_NAME "pata-rb532-cf" |
| #define DRV_VERSION "0.1.0" |
| #define DRV_DESC "PATA driver for RouterBOARD 532 Compact Flash" |
| |
| #define RB500_CF_MAXPORTS 1 |
| #define RB500_CF_IO_DELAY 400 |
| |
| #define RB500_CF_REG_BASE 0x0800 |
| #define RB500_CF_REG_ERR 0x080D |
| #define RB500_CF_REG_CTRL 0x080E |
| /* 32bit buffered data register offset */ |
| #define RB500_CF_REG_DBUF32 0x0C00 |
| |
| struct rb532_cf_info { |
| void __iomem *iobase; |
| unsigned int gpio_line; |
| int frozen; |
| unsigned int irq; |
| }; |
| |
| /* ------------------------------------------------------------------------ */ |
| |
| static void rb532_pata_freeze(struct ata_port *ap) |
| { |
| struct rb532_cf_info *info = ap->host->private_data; |
| |
| info->frozen = 1; |
| } |
| |
| static void rb532_pata_thaw(struct ata_port *ap) |
| { |
| struct rb532_cf_info *info = ap->host->private_data; |
| |
| info->frozen = 0; |
| } |
| |
| static irqreturn_t rb532_pata_irq_handler(int irq, void *dev_instance) |
| { |
| struct ata_host *ah = dev_instance; |
| struct rb532_cf_info *info = ah->private_data; |
| |
| if (gpio_get_value(info->gpio_line)) { |
| set_irq_type(info->irq, IRQ_TYPE_LEVEL_LOW); |
| if (!info->frozen) |
| ata_sff_interrupt(info->irq, dev_instance); |
| } else { |
| set_irq_type(info->irq, IRQ_TYPE_LEVEL_HIGH); |
| } |
| |
| return IRQ_HANDLED; |
| } |
| |
| static struct ata_port_operations rb532_pata_port_ops = { |
| .inherits = &ata_sff_port_ops, |
| .sff_data_xfer = ata_sff_data_xfer32, |
| .freeze = rb532_pata_freeze, |
| .thaw = rb532_pata_thaw, |
| }; |
| |
| /* ------------------------------------------------------------------------ */ |
| |
| static struct scsi_host_template rb532_pata_sht = { |
| ATA_PIO_SHT(DRV_NAME), |
| }; |
| |
| /* ------------------------------------------------------------------------ */ |
| |
| static void rb532_pata_setup_ports(struct ata_host *ah) |
| { |
| struct rb532_cf_info *info = ah->private_data; |
| struct ata_port *ap; |
| |
| ap = ah->ports[0]; |
| |
| ap->ops = &rb532_pata_port_ops; |
| ap->pio_mask = 0x1f; /* PIO4 */ |
| ap->flags = ATA_FLAG_NO_LEGACY | ATA_FLAG_MMIO; |
| |
| ap->ioaddr.cmd_addr = info->iobase + RB500_CF_REG_BASE; |
| ap->ioaddr.ctl_addr = info->iobase + RB500_CF_REG_CTRL; |
| ap->ioaddr.altstatus_addr = info->iobase + RB500_CF_REG_CTRL; |
| |
| ata_sff_std_ports(&ap->ioaddr); |
| |
| ap->ioaddr.data_addr = info->iobase + RB500_CF_REG_DBUF32; |
| ap->ioaddr.error_addr = info->iobase + RB500_CF_REG_ERR; |
| } |
| |
| static __devinit int rb532_pata_driver_probe(struct platform_device *pdev) |
| { |
| unsigned int irq; |
| int gpio; |
| struct resource *res; |
| struct ata_host *ah; |
| struct rb532_cf_info *info; |
| int ret; |
| |
| res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| if (!res) { |
| dev_err(&pdev->dev, "no IOMEM resource found\n"); |
| return -EINVAL; |
| } |
| |
| irq = platform_get_irq(pdev, 0); |
| if (irq <= 0) { |
| dev_err(&pdev->dev, "no IRQ resource found\n"); |
| return -ENOENT; |
| } |
| |
| gpio = irq_to_gpio(irq); |
| if (gpio < 0) { |
| dev_err(&pdev->dev, "no GPIO found for irq%d\n", irq); |
| return -ENOENT; |
| } |
| |
| ret = gpio_request(gpio, DRV_NAME); |
| if (ret) { |
| dev_err(&pdev->dev, "GPIO request failed\n"); |
| return ret; |
| } |
| |
| /* allocate host */ |
| ah = ata_host_alloc(&pdev->dev, RB500_CF_MAXPORTS); |
| if (!ah) |
| return -ENOMEM; |
| |
| platform_set_drvdata(pdev, ah); |
| |
| info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL); |
| if (!info) |
| return -ENOMEM; |
| |
| ah->private_data = info; |
| info->gpio_line = gpio; |
| info->irq = irq; |
| |
| info->iobase = devm_ioremap_nocache(&pdev->dev, res->start, |
| res->end - res->start + 1); |
| if (!info->iobase) |
| return -ENOMEM; |
| |
| ret = gpio_direction_input(gpio); |
| if (ret) { |
| dev_err(&pdev->dev, "unable to set GPIO direction, err=%d\n", |
| ret); |
| goto err_free_gpio; |
| } |
| |
| rb532_pata_setup_ports(ah); |
| |
| ret = ata_host_activate(ah, irq, rb532_pata_irq_handler, |
| IRQF_TRIGGER_LOW, &rb532_pata_sht); |
| if (ret) |
| goto err_free_gpio; |
| |
| return 0; |
| |
| err_free_gpio: |
| gpio_free(gpio); |
| |
| return ret; |
| } |
| |
| static __devexit int rb532_pata_driver_remove(struct platform_device *pdev) |
| { |
| struct ata_host *ah = platform_get_drvdata(pdev); |
| struct rb532_cf_info *info = ah->private_data; |
| |
| ata_host_detach(ah); |
| gpio_free(info->gpio_line); |
| |
| return 0; |
| } |
| |
| /* work with hotplug and coldplug */ |
| MODULE_ALIAS("platform:" DRV_NAME); |
| |
| static struct platform_driver rb532_pata_platform_driver = { |
| .probe = rb532_pata_driver_probe, |
| .remove = __devexit_p(rb532_pata_driver_remove), |
| .driver = { |
| .name = DRV_NAME, |
| .owner = THIS_MODULE, |
| }, |
| }; |
| |
| /* ------------------------------------------------------------------------ */ |
| |
| #define DRV_INFO DRV_DESC " version " DRV_VERSION |
| |
| static int __init rb532_pata_module_init(void) |
| { |
| printk(KERN_INFO DRV_INFO "\n"); |
| |
| return platform_driver_register(&rb532_pata_platform_driver); |
| } |
| |
| static void __exit rb532_pata_module_exit(void) |
| { |
| platform_driver_unregister(&rb532_pata_platform_driver); |
| } |
| |
| MODULE_AUTHOR("Gabor Juhos <juhosg at openwrt.org>"); |
| MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>"); |
| MODULE_DESCRIPTION(DRV_DESC); |
| MODULE_VERSION(DRV_VERSION); |
| MODULE_LICENSE("GPL"); |
| |
| module_init(rb532_pata_module_init); |
| module_exit(rb532_pata_module_exit); |