--- /dev/null
+/*
+ * 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/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/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;
+ 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 (gpio_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;
+ 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,
+ resource_size(res));
+ 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 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;
+}
+
+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);
Code Review / kvmfornfv.git / blobdiff