diff options
Diffstat (limited to 'target/linux/adm5120/files-2.6.26/drivers/ata/pata_rb153_cf.c')
-rw-r--r-- | target/linux/adm5120/files-2.6.26/drivers/ata/pata_rb153_cf.c | 268 |
1 files changed, 268 insertions, 0 deletions
diff --git a/target/linux/adm5120/files-2.6.26/drivers/ata/pata_rb153_cf.c b/target/linux/adm5120/files-2.6.26/drivers/ata/pata_rb153_cf.c new file mode 100644 index 000000000..ef7f5835a --- /dev/null +++ b/target/linux/adm5120/files-2.6.26/drivers/ata/pata_rb153_cf.c @@ -0,0 +1,268 @@ +/* + * 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); |