283 lines
6.8 KiB
C
283 lines
6.8 KiB
C
/*
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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 <florian@openwrt.org>
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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 <a.zummo@towertech.it>
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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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/libata.h>
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#include <scsi/scsi_host.h>
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#include <asm/gpio.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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unsigned int gpio_line;
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int frozen;
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unsigned int irq;
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};
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/* ------------------------------------------------------------------------ */
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static inline void rb532_pata_finish_io(struct ata_port *ap)
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{
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struct ata_host *ah = ap->host;
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struct rb532_cf_info *info = ah->private_data;
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/* FIXME: Keep previous delay. If this is merely a fence then
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ata_sff_sync might be sufficient. */
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ata_sff_dma_pause(ap);
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ndelay(RB500_CF_IO_DELAY);
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}
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static void rb532_pata_exec_command(struct ata_port *ap,
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const struct ata_taskfile *tf)
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{
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writeb(tf->command, ap->ioaddr.command_addr);
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rb532_pata_finish_io(ap);
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}
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static unsigned int rb532_pata_data_xfer(struct ata_device *adev, unsigned char *buf,
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unsigned int buflen, int write_data)
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{
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struct ata_port *ap = adev->link->ap;
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void __iomem *ioaddr = ap->ioaddr.data_addr;
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int retlen = buflen;
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if (write_data) {
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for (; buflen > 0; buflen--, buf++)
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writeb(*buf, ioaddr);
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} else {
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for (; buflen > 0; buflen--, buf++)
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*buf = readb(ioaddr);
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}
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rb532_pata_finish_io(adev->link->ap);
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return retlen;
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}
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static void rb532_pata_freeze(struct ata_port *ap)
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{
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struct rb532_cf_info *info = ap->host->private_data;
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info->frozen = 1;
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}
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static void rb532_pata_thaw(struct ata_port *ap)
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{
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struct rb532_cf_info *info = ap->host->private_data;
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info->frozen = 0;
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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 (gpio_get_value(info->gpio_line)) {
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set_irq_type(info->irq, IRQ_TYPE_LEVEL_LOW);
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if (!info->frozen)
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ata_sff_interrupt(info->irq, dev_instance);
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} else {
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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_exec_command = rb532_pata_exec_command,
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.sff_data_xfer = rb532_pata_data_xfer,
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.freeze = rb532_pata_freeze,
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.thaw = rb532_pata_thaw,
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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 = 0x1f; /* PIO4 */
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ap->flags = ATA_FLAG_NO_LEGACY | ATA_FLAG_MMIO;
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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 __devinit int rb532_pata_driver_probe(struct platform_device *pdev)
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{
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unsigned int irq;
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int gpio;
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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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dev_err(&pdev->dev, "no IRQ resource found\n");
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return -ENOENT;
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}
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gpio = irq_to_gpio(irq);
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if (gpio < 0) {
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dev_err(&pdev->dev, "no GPIO found for irq%d\n", irq);
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return -ENOENT;
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}
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ret = gpio_request(gpio, DRV_NAME);
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if (ret) {
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dev_err(&pdev->dev, "GPIO request failed\n");
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return ret;
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}
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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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platform_set_drvdata(pdev, ah);
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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 = gpio;
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info->irq = irq;
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info->iobase = devm_ioremap_nocache(&pdev->dev, res->start,
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res->end - res->start + 1);
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if (!info->iobase)
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return -ENOMEM;
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ret = gpio_direction_input(gpio);
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if (ret) {
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dev_err(&pdev->dev, "unable to set GPIO direction, err=%d\n",
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ret);
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goto err_free_gpio;
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}
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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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goto err_free_gpio;
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return 0;
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err_free_gpio:
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gpio_free(gpio);
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return ret;
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}
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static __devexit 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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struct rb532_cf_info *info = ah->private_data;
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ata_host_detach(ah);
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gpio_free(info->gpio_line);
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return 0;
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}
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/* work with hotplug and coldplug */
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MODULE_ALIAS("platform:" DRV_NAME);
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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 = __devexit_p(rb532_pata_driver_remove),
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.driver = {
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.name = DRV_NAME,
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.owner = THIS_MODULE,
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},
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};
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/* ------------------------------------------------------------------------ */
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#define DRV_INFO DRV_DESC " version " DRV_VERSION
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static int __init rb532_pata_module_init(void)
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{
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printk(KERN_INFO DRV_INFO "\n");
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return platform_driver_register(&rb532_pata_platform_driver);
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}
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static void __exit rb532_pata_module_exit(void)
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{
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platform_driver_unregister(&rb532_pata_platform_driver);
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}
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MODULE_AUTHOR("Gabor Juhos <juhosg at openwrt.org>");
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MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
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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_init(rb532_pata_module_init);
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module_exit(rb532_pata_module_exit);
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