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@@ -0,0 +1,314 @@
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+/*
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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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+
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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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+
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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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+
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+#include <linux/libata.h>
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+#include <scsi/scsi_host.h>
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+
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+#include <asm/gpio.h>
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+
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+#define DRV_NAME "pata-rb500-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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+
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+#define RB500_CF_MAXPORTS 1
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+#define RB500_CF_IO_DELAY 400
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+
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+#define RB500_CF_REG_CMD 0x0800
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+#define RB500_CF_REG_CTRL 0x080E
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+#define RB500_CF_REG_DATA 0x0C00
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+
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+struct rb500_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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+/* ------------------------------------------------------------------------ */
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+
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+static inline void rb500_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 rb500_cf_info *info = ah->private_data;
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+
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+ ata_altstatus(ap);
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+ ndelay(RB500_CF_IO_DELAY);
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+
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+ set_irq_type(info->irq, IRQ_TYPE_LEVEL_HIGH);
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+}
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+
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+static void rb500_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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+ rb500_pata_finish_io(ap);
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+}
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+
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+static void rb500_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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+
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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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+
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+ rb500_pata_finish_io(adev->link->ap);
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+}
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+
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+static void rb500_pata_freeze(struct ata_port *ap)
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+{
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+ struct rb500_cf_info *info = ap->host->private_data;
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+
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+ info->frozen = 1;
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+}
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+
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+static void rb500_pata_thaw(struct ata_port *ap)
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+{
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+ struct rb500_cf_info *info = ap->host->private_data;
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+
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+ info->frozen = 0;
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+}
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+
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+static irqreturn_t rb500_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 rb500_cf_info *info = ah->private_data;
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+
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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_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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+
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+ return IRQ_HANDLED;
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+}
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+
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+static void rb500_pata_irq_clear(struct ata_port *ap)
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+{
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+}
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+
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+static int rb500_pata_port_start(struct ata_port *ap)
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+{
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+ return 0;
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+}
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+
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+static struct ata_port_operations rb500_pata_port_ops = {
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+ .tf_load = ata_tf_load,
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+ .tf_read = ata_tf_read,
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+
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+ .exec_command = rb500_pata_exec_command,
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+ .check_status = ata_check_status,
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+ .dev_select = ata_std_dev_select,
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+
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+ .data_xfer = rb500_pata_data_xfer,
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+
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+ .qc_prep = ata_qc_prep,
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+ .qc_issue = ata_qc_issue_prot,
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+
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+ .freeze = rb500_pata_freeze,
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+ .thaw = rb500_pata_thaw,
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+ .error_handler = ata_bmdma_error_handler,
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+
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+ .irq_handler = rb500_pata_irq_handler,
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+ .irq_clear = rb500_pata_irq_clear,
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+ .irq_on = ata_irq_on,
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+
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+ .port_start = rb500_pata_port_start,
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+};
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+
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+/* ------------------------------------------------------------------------ */
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+
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+static struct scsi_host_template rb500_pata_sht = {
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+ .module = THIS_MODULE,
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+ .name = DRV_NAME,
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+ .ioctl = ata_scsi_ioctl,
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+ .queuecommand = ata_scsi_queuecmd,
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+ .slave_configure = ata_scsi_slave_config,
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+ .slave_destroy = ata_scsi_slave_destroy,
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+ .bios_param = ata_std_bios_param,
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+ .proc_name = DRV_NAME,
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+
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+ .can_queue = ATA_DEF_QUEUE,
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+ .this_id = ATA_SHT_THIS_ID,
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+ .sg_tablesize = LIBATA_MAX_PRD,
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+ .dma_boundary = ATA_DMA_BOUNDARY,
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+ .cmd_per_lun = ATA_SHT_CMD_PER_LUN,
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+ .emulated = ATA_SHT_EMULATED,
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+ .use_clustering = ATA_SHT_USE_CLUSTERING,
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+};
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+
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+/* ------------------------------------------------------------------------ */
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+
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+static void rb500_pata_setup_ports(struct ata_host *ah)
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+{
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+ struct rb500_cf_info *info = ah->private_data;
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+ struct ata_port *ap;
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+
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+ ap = ah->ports[0];
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+
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+ ap->ops = &rb500_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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+
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+ ap->ioaddr.cmd_addr = info->iobase + RB500_CF_REG_CMD;
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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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+
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+ ata_std_ports(&ap->ioaddr);
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+
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+ ap->ioaddr.data_addr = info->iobase + RB500_CF_REG_DATA;
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+}
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+
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+static __devinit int rb500_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 rb500_cf_info *info;
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+ int ret;
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+
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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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+
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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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+
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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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+
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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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+
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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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+
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+ platform_set_drvdata(pdev, ah);
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+
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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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+
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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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+
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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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+
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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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+
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+ rb500_pata_setup_ports(ah);
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+
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+ ret = ata_host_activate(ah, irq, rb500_pata_irq_handler,
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+ IRQF_TRIGGER_LOW, &rb500_pata_sht);
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+ if (ret)
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+ goto err_free_gpio;
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+
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+ return 0;
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+
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+err_free_gpio:
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+ gpio_free(gpio);
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+
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+ return ret;
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+}
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+
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+static __devexit int rb500_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 rb500_cf_info *info = ah->private_data;
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+
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+ ata_host_detach(ah);
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+ gpio_free(info->gpio_line);
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+
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+ return 0;
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+}
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+
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+static struct platform_driver rb500_pata_platform_driver = {
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+ .probe = rb500_pata_driver_probe,
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+ .remove = __devexit_p(rb500_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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+/* ------------------------------------------------------------------------ */
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+
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+#define DRV_INFO DRV_DESC " version " DRV_VERSION
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+
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+static int __init rb500_pata_module_init(void)
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+{
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+ printk(KERN_INFO DRV_INFO "\n");
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+
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+ return platform_driver_register(&rb500_pata_platform_driver);
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+}
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+
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+static void __exit rb500_pata_module_exit(void)
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+{
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+ platform_driver_unregister(&rb500_pata_platform_driver);
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+}
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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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+
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+module_init(rb500_pata_module_init);
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+module_exit(rb500_pata_module_exit);
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Linus Torvalds