/* * A low-level PATA driver to handle a Compact Flash connected on the * Mikrotik's RouterBoard 153 board. * * Copyright (C) 2007-2008 Gabor Juhos <juhosg@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/io.h> #include <linux/interrupt.h> #include <linux/irq.h> #include <linux/gpio.h> #include <linux/platform_device.h> #include <linux/libata.h> #include <scsi/scsi_host.h> #define DRV_NAME "pata-rb153-cf" #define DRV_VERSION "0.5.0" #define DRV_DESC "PATA driver for RouterBOARD 153 Compact Flash" #define RB153_CF_MAXPORTS 1 #define RB153_CF_IO_DELAY 100 #define RB153_CF_REG_CMD 0x0800 #define RB153_CF_REG_CTRL 0x080E #define RB153_CF_REG_DATA 0x0C00 struct rb153_cf_info { void __iomem *iobase; unsigned int gpio_line; int frozen; unsigned int irq; }; static inline void rb153_pata_finish_io(struct ata_port *ap) { struct rb153_cf_info *info = ap->host->private_data; /* FIXME: Keep previous delay. If this is merely a fence then * ata_sff_sync might be sufficient. */ ata_sff_dma_pause(ap); ndelay(RB153_CF_IO_DELAY); set_irq_type(info->irq, IRQ_TYPE_LEVEL_HIGH); } static void rb153_pata_exec_command(struct ata_port *ap, const struct ata_taskfile *tf) { writeb(tf->command, ap->ioaddr.command_addr); rb153_pata_finish_io(ap); } static unsigned int rb153_pata_data_xfer(struct ata_device *adev, unsigned char *buf, unsigned int buflen, int write_data) { void __iomem *ioaddr = adev->link->ap->ioaddr.data_addr; unsigned int t; t = buflen; if (write_data) { for (; t > 0; t--, buf++) writeb(*buf, ioaddr); } else { for (; t > 0; t--, buf++) *buf = readb(ioaddr); } rb153_pata_finish_io(adev->link->ap); return buflen; } static void rb153_pata_freeze(struct ata_port *ap) { struct rb153_cf_info *info = ap->host->private_data; info->frozen = 1; } static void rb153_pata_thaw(struct ata_port *ap) { struct rb153_cf_info *info = ap->host->private_data; info->frozen = 0; } static irqreturn_t rb153_pata_irq_handler(int irq, void *dev_instance) { struct ata_host *ah = dev_instance; struct rb153_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(irq, dev_instance); } else { set_irq_type(info->irq, IRQ_TYPE_LEVEL_HIGH); } return IRQ_HANDLED; } static struct ata_port_operations rb153_pata_port_ops = { .inherits = &ata_sff_port_ops, .sff_exec_command = rb153_pata_exec_command, .sff_data_xfer = rb153_pata_data_xfer, .freeze = rb153_pata_freeze, .thaw = rb153_pata_thaw, }; static struct scsi_host_template rb153_pata_sht = { ATA_PIO_SHT(DRV_NAME), }; static void rb153_pata_setup_port(struct ata_host *ah) { struct rb153_cf_info *info = ah->private_data; struct ata_port *ap; ap = ah->ports[0]; ap->ops = &rb153_pata_port_ops; ap->pio_mask = 0x1f; /* PIO4 */ ap->flags = ATA_FLAG_NO_LEGACY | ATA_FLAG_MMIO; ap->ioaddr.cmd_addr = info->iobase + RB153_CF_REG_CMD; ap->ioaddr.ctl_addr = info->iobase + RB153_CF_REG_CTRL; ap->ioaddr.altstatus_addr = info->iobase + RB153_CF_REG_CTRL; ata_sff_std_ports(&ap->ioaddr); ap->ioaddr.data_addr = info->iobase + RB153_CF_REG_DATA; } static __devinit int rb153_pata_driver_probe(struct platform_device *pdev) { unsigned int irq; int gpio; struct resource *res; struct ata_host *ah; struct rb153_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; } ah = ata_host_alloc(&pdev->dev, RB153_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; } rb153_pata_setup_port(ah); ret = ata_host_activate(ah, irq, rb153_pata_irq_handler, IRQF_TRIGGER_LOW, &rb153_pata_sht); if (ret) goto err_free_gpio; return 0; err_free_gpio: gpio_free(gpio); return ret; } static __devexit int rb153_pata_driver_remove(struct platform_device *pdev) { struct ata_host *ah = platform_get_drvdata(pdev); struct rb153_cf_info *info = ah->private_data; ata_host_detach(ah); gpio_free(info->gpio_line); return 0; } static struct platform_driver rb153_pata_platform_driver = { .probe = rb153_pata_driver_probe, .remove = __devexit_p(rb153_pata_driver_remove), .driver = { .name = DRV_NAME, .owner = THIS_MODULE, }, }; /* ------------------------------------------------------------------------ */ #define DRV_INFO DRV_DESC " version " DRV_VERSION static int __init rb153_pata_module_init(void) { printk(KERN_INFO DRV_INFO "\n"); return platform_driver_register(&rb153_pata_platform_driver); } static void __exit rb153_pata_module_exit(void) { platform_driver_unregister(&rb153_pata_platform_driver); } MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>"); MODULE_DESCRIPTION(DRV_DESC); MODULE_VERSION(DRV_VERSION); MODULE_LICENSE("GPL v2"); module_init(rb153_pata_module_init); module_exit(rb153_pata_module_exit);