diff options
Diffstat (limited to 'drivers/ata/pata_rb532_cf.c')
| -rw-r--r-- | drivers/ata/pata_rb532_cf.c | 184 |
1 files changed, 184 insertions, 0 deletions
diff --git a/drivers/ata/pata_rb532_cf.c b/drivers/ata/pata_rb532_cf.c new file mode 100644 index 000000000..2e110aefe --- /dev/null +++ b/drivers/ata/pata_rb532_cf.c @@ -0,0 +1,184 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * 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. + */ + +#include <linux/gfp.h> +#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/gpio/consumer.h> + +#include <linux/libata.h> +#include <scsi/scsi_host.h> + +#include <asm/mach-rc32434/rb.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; + struct gpio_desc *gpio_line; + unsigned int irq; +}; + +/* ------------------------------------------------------------------------ */ + +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 (gpiod_get_value(info->gpio_line)) { + irq_set_irq_type(info->irq, IRQ_TYPE_LEVEL_LOW); + ata_sff_interrupt(info->irq, dev_instance); + } else { + irq_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, +}; + +/* ------------------------------------------------------------------------ */ + +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 = ATA_PIO4; + + 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 int rb532_pata_driver_probe(struct platform_device *pdev) +{ + int irq; + struct gpio_desc *gpiod; + 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) + return irq; + if (!irq) + return -EINVAL; + + gpiod = devm_gpiod_get(&pdev->dev, NULL, GPIOD_IN); + if (IS_ERR(gpiod)) { + dev_err(&pdev->dev, "no GPIO found for irq%d\n", irq); + return PTR_ERR(gpiod); + } + gpiod_set_consumer_name(gpiod, DRV_NAME); + + /* allocate host */ + ah = ata_host_alloc(&pdev->dev, RB500_CF_MAXPORTS); + if (!ah) + return -ENOMEM; + + info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL); + if (!info) + return -ENOMEM; + + ah->private_data = info; + info->gpio_line = gpiod; + info->irq = irq; + + info->iobase = devm_ioremap(&pdev->dev, res->start, + resource_size(res)); + if (!info->iobase) + return -ENOMEM; + + rb532_pata_setup_ports(ah); + + ret = ata_host_activate(ah, irq, rb532_pata_irq_handler, + IRQF_TRIGGER_LOW, &rb532_pata_sht); + if (ret) + return ret; + + return 0; +} + +static int rb532_pata_driver_remove(struct platform_device *pdev) +{ + struct ata_host *ah = platform_get_drvdata(pdev); + + ata_host_detach(ah); + + return 0; +} + +static struct platform_driver rb532_pata_platform_driver = { + .probe = rb532_pata_driver_probe, + .remove = rb532_pata_driver_remove, + .driver = { + .name = DRV_NAME, + }, +}; + +#define DRV_INFO DRV_DESC " version " DRV_VERSION + +module_platform_driver(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_ALIAS("platform:" DRV_NAME); |