+/*
+ * A low-level PATA driver to handle a Compact Flash connected on the
+ * Mikrotik's RouterBoard 153 board.
+ *
+ * Copyright (C) 2007 Gabor Juhos <juhosg at 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/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-rb153-cf"
+#define DRV_VERSION "0.1"
+#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 error;
+};
+
+/* ------------------------------------------------------------------------ */
+
+static inline void rb153_pata_finish_io(struct ata_port *ap)
+{
+ struct ata_host *ah = ap->host;
+
+ ata_altstatus(ap);
+ ndelay(RB153_CF_IO_DELAY);
+
+ set_irq_type(ah->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 void rb153_pata_data_xfer(struct ata_device *adev, unsigned char *buf,
+ unsigned int buflen, int write_data)
+{
+ struct ata_port *ap = adev->ap;
+ unsigned int i;
+
+ if (write_data) {
+ for (i = 0; i < buflen; i++)
+ writeb(buf[i], ap->ioaddr.data_addr);
+ } else {
+ for (; buflen > 0; buflen--)
+ buf[i] = readb(ap->ioaddr.data_addr);
+ }
+
+ rb153_pata_finish_io(ap);
+}
+
+static void rb153_pata_thaw(struct ata_port *ap)
+{
+ struct rb153_cf_info *info = ap->host->private_data;
+
+ info->error = 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(ah->irq, IRQ_TYPE_LEVEL_LOW);
+ if (!info->error)
+ ata_interrupt(irq, dev_instance);
+ } else {
+ set_irq_type(ah->irq, IRQ_TYPE_LEVEL_HIGH);
+ }
+
+ return IRQ_HANDLED;
+}
+
+static void rb153_pata_irq_clear(struct ata_port *ap)
+{
+}
+
+static int rb153_pata_port_start(struct ata_port *ap)
+{
+ return 0;
+}
+
+static struct ata_port_operations rb153_pata_port_ops = {
+ .port_disable = ata_port_disable,
+
+ .tf_load = ata_tf_load,
+ .tf_read = ata_tf_read,
+
+ .exec_command = rb153_pata_exec_command,
+ .check_status = ata_check_status,
+ .dev_select = ata_std_dev_select,
+
+ .data_xfer = rb153_pata_data_xfer,
+
+ .qc_prep = ata_qc_prep,
+ .qc_issue = ata_qc_issue_prot,
+
+ .thaw = rb153_pata_thaw,
+ .error_handler = ata_bmdma_error_handler,
+
+ .irq_handler = rb153_pata_irq_handler,
+ .irq_clear = rb153_pata_irq_clear,
+ .irq_on = ata_irq_on,
+
+ .port_start = rb153_pata_port_start,
+};
+
+/* ------------------------------------------------------------------------ */
+
+static struct scsi_host_template rb153_pata_sht = {
+ .module = THIS_MODULE,
+ .name = DRV_NAME,
+ .ioctl = ata_scsi_ioctl,
+ .queuecommand = ata_scsi_queuecmd,
+ .slave_configure = ata_scsi_slave_config,
+ .slave_destroy = ata_scsi_slave_destroy,
+ .bios_param = ata_std_bios_param,
+ .proc_name = DRV_NAME,
+
+ .can_queue = ATA_DEF_QUEUE,
+ .this_id = ATA_SHT_THIS_ID,
+ .sg_tablesize = LIBATA_MAX_PRD,
+ .dma_boundary = ATA_DMA_BOUNDARY,
+ .cmd_per_lun = ATA_SHT_CMD_PER_LUN,
+ .emulated = ATA_SHT_EMULATED,
+ .use_clustering = ATA_SHT_USE_CLUSTERING,
+};
+
+/* ------------------------------------------------------------------------ */
+
+static void rb153_pata_setup_ports(struct ata_host *ah)
+{
+ struct rb153_cf_info *info = ah->private_data;
+ struct ata_port *ap;
+ struct ata_ioports *iop;
+
+ ap = ah->ports[0];
+ iop = &ap->ioaddr;
+
+ ap->ops = &rb153_pata_port_ops;
+ ap->pio_mask = 0x1f; /* PIO4 */
+ ap->flags |= ATA_FLAG_MMIO | ATA_FLAG_NO_LEGACY;
+
+ iop->cmd_addr = info->iobase + RB153_CF_REG_CMD;
+ iop->ctl_addr = info->iobase + RB153_CF_REG_CTRL;
+ iop->altstatus_addr = info->iobase + RB153_CF_REG_CTRL;
+ iop->data_addr = info->iobase + RB153_CF_REG_DATA;
+
+ ata_std_ports(iop);
+}
+
+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;
+ }
+
+ /* allocate host */
+ 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->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_ports(ah);
+
+ ret = ata_host_activate(ah, irq, ata_interrupt, IRQF_TRIGGER_HIGH,
+ &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 at openwrt.org>");
+MODULE_DESCRIPTION(DRV_DESC);
+MODULE_VERSION(DRV_VERSION);
+MODULE_LICENSE("GPL");
+
+module_init(rb153_pata_module_init);
+module_exit(rb153_pata_module_exit);
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