[libata] ARM: add ixp4xx PATA driver

Signed-off-by: Alessandro Zummo <a.zummo@towertech.it>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

3 files changed, 282 insertions, 0 deletions

diff --git a/drivers/ata/Kconfig b/drivers/ata/Kconfig
index 98d0f01c90eb..984ab284382a 100644
--- a/drivers/ata/Kconfig
+++ b/drivers/ata/Kconfig
@@ -508,6 +508,16 @@ config PATA_PLATFORM
 
           If unsure, say N.
 
+config PATA_IXP4XX_CF
+        tristate "IXP4XX Compact Flash support"
+        depends on ARCH_IXP4XX
+        help
+          This option enables support for a Compact Flash connected on
+          the ixp4xx expansion bus. This driver had been written for
+          Loft/Avila boards in mind but can work with others.
+
+          If unsure, say N.
+
 endif
 endmenu
 
diff --git a/drivers/ata/Makefile b/drivers/ata/Makefile
index f2b3ea2d15d0..bc3d81ae757e 100644
--- a/drivers/ata/Makefile
+++ b/drivers/ata/Makefile
@@ -55,6 +55,7 @@ obj-$(CONFIG_PATA_WINBOND)	+= pata_sl82c105.o
 obj-$(CONFIG_PATA_WINBOND_VLB)  += pata_winbond.o
 obj-$(CONFIG_PATA_SIS)          += pata_sis.o
 obj-$(CONFIG_PATA_TRIFLEX)      += pata_triflex.o
+obj-$(CONFIG_PATA_IXP4XX_CF)    += pata_ixp4xx_cf.o
 obj-$(CONFIG_PATA_PLATFORM)     += pata_platform.o
 # Should be last but one libata driver
 obj-$(CONFIG_ATA_GENERIC)       += ata_generic.o
diff --git a/drivers/ata/pata_ixp4xx_cf.c b/drivers/ata/pata_ixp4xx_cf.c
new file mode 100644
index 000000000000..d2268bfe6f55
--- /dev/null
+++ b/drivers/ata/pata_ixp4xx_cf.c
@@ -0,0 +1,271 @@
+/*
+ * ixp4xx PATA/Compact Flash driver
+ * Copyright (c) 2006 Tower Technologies
+ * Author: Alessandro Zummo <a.zummo@towertech.it>
+ *
+ * An ATA driver to handle a Compact Flash connected
+ * to the ixp4xx expansion bus in TrueIDE mode. The CF
+ * must have it chip selects connected to two CS lines
+ * on the ixp4xx. The interrupt line is optional, if not
+ * specified the driver will run in polling mode.
+ *
+ * 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/libata.h>
+#include <linux/irq.h>
+#include <linux/platform_device.h>
+#include <scsi/scsi_host.h>
+
+#define DRV_NAME        "pata_ixp4xx_cf"
+#define DRV_VERSION     "0.1.1"
+
+static void ixp4xx_set_mode(struct ata_port *ap)
+{
+        int i;
+
+        for (i = 0; i < ATA_MAX_DEVICES; i++) {
+                struct ata_device *dev = &ap->device[i];
+                if (ata_dev_enabled(dev)) {
+                        dev->pio_mode = XFER_PIO_0;
+                        dev->xfer_mode = XFER_PIO_0;
+                        dev->xfer_shift = ATA_SHIFT_PIO;
+                        dev->flags |= ATA_DFLAG_PIO;
+                }
+        }
+}
+
+static void ixp4xx_phy_reset(struct ata_port *ap)
+{
+        ap->cbl = ATA_CBL_PATA40;
+        ata_port_probe(ap);
+        ata_bus_reset(ap);
+}
+
+static void ixp4xx_mmio_data_xfer(struct ata_device *adev, unsigned char *buf,
+                                unsigned int buflen, int write_data)
+{
+        unsigned int i;
+        unsigned int words = buflen >> 1;
+        u16 *buf16 = (u16 *) buf;
+        struct ata_port *ap = adev->ap;
+        void __iomem *mmio = (void __iomem *)ap->ioaddr.data_addr;
+        struct ixp4xx_pata_data *data = ap->host->dev->platform_data;
+
+        /* set the expansion bus in 16bit mode and restore
+         * 8 bit mode after the transaction.
+         */
+        *data->cs0_cfg &= ~(0x01);
+        udelay(100);
+
+        /* Transfer multiple of 2 bytes */
+        if (write_data) {
+                for (i = 0; i < words; i++)
+                        writew(buf16[i], mmio);
+        } else {
+                for (i = 0; i < words; i++)
+                        buf16[i] = readw(mmio);
+        }
+
+        /* Transfer trailing 1 byte, if any. */
+        if (unlikely(buflen & 0x01)) {
+                u16 align_buf[1] = { 0 };
+                unsigned char *trailing_buf = buf + buflen - 1;
+
+                if (write_data) {
+                        memcpy(align_buf, trailing_buf, 1);
+                        writew(align_buf[0], mmio);
+                } else {
+                        align_buf[0] = readw(mmio);
+                        memcpy(trailing_buf, align_buf, 1);
+                }
+        }
+
+        udelay(100);
+        *data->cs0_cfg |= 0x01;
+}
+
+static void ixp4xx_irq_clear(struct ata_port *ap)
+{
+}
+
+static void ixp4xx_host_stop (struct ata_host *host)
+{
+        struct ixp4xx_pata_data *data = host->dev->platform_data;
+
+        iounmap(data->cs0);
+        iounmap(data->cs1);
+}
+
+static struct scsi_host_template ixp4xx_sht = {
+        .module                 = THIS_MODULE,
+        .name                   = DRV_NAME,
+        .ioctl                  = ata_scsi_ioctl,
+        .queuecommand           = ata_scsi_queuecmd,
+        .can_queue              = ATA_DEF_QUEUE,
+        .this_id                = ATA_SHT_THIS_ID,
+        .sg_tablesize           = LIBATA_MAX_PRD,
+        .max_sectors            = ATA_MAX_SECTORS,
+        .cmd_per_lun            = ATA_SHT_CMD_PER_LUN,
+        .emulated               = ATA_SHT_EMULATED,
+        .use_clustering         = ATA_SHT_USE_CLUSTERING,
+        .proc_name              = DRV_NAME,
+        .dma_boundary           = ATA_DMA_BOUNDARY,
+        .slave_configure        = ata_scsi_slave_config,
+        .bios_param             = ata_std_bios_param,
+};
+
+static struct ata_port_operations ixp4xx_port_ops = {
+        .set_mode       = ixp4xx_set_mode,
+        .mode_filter    = ata_pci_default_filter,
+
+        .port_disable   = ata_port_disable,
+        .tf_load        = ata_tf_load,
+        .tf_read        = ata_tf_read,
+        .check_status   = ata_check_status,
+        .exec_command   = ata_exec_command,
+        .dev_select     = ata_std_dev_select,
+
+        .qc_prep        = ata_qc_prep,
+        .qc_issue       = ata_qc_issue_prot,
+        .eng_timeout    = ata_eng_timeout,
+        .data_xfer      = ixp4xx_mmio_data_xfer,
+
+        .irq_handler    = ata_interrupt,
+        .irq_clear      = ixp4xx_irq_clear,
+
+        .port_start     = ata_port_start,
+        .port_stop      = ata_port_stop,
+        .host_stop      = ixp4xx_host_stop,
+
+        .phy_reset      = ixp4xx_phy_reset,
+};
+
+static void ixp4xx_setup_port(struct ata_ioports *ioaddr,
+                                struct ixp4xx_pata_data *data)
+{
+        ioaddr->cmd_addr        = (unsigned long) data->cs0;
+        ioaddr->altstatus_addr  = (unsigned long) data->cs1 + 0x06;
+        ioaddr->ctl_addr        = (unsigned long) data->cs1 + 0x06;
+
+        ata_std_ports(ioaddr);
+
+#ifndef __ARMEB__
+
+        /* adjust the addresses to handle the address swizzling of the
+         * ixp4xx in little endian mode.
+         */
+
+        ioaddr->data_addr       ^= 0x02;
+        ioaddr->cmd_addr        ^= 0x03;
+        ioaddr->altstatus_addr  ^= 0x03;
+        ioaddr->ctl_addr        ^= 0x03;
+        ioaddr->error_addr      ^= 0x03;
+        ioaddr->feature_addr    ^= 0x03;
+        ioaddr->nsect_addr      ^= 0x03;
+        ioaddr->lbal_addr       ^= 0x03;
+        ioaddr->lbam_addr       ^= 0x03;
+        ioaddr->lbah_addr       ^= 0x03;
+        ioaddr->device_addr     ^= 0x03;
+        ioaddr->status_addr     ^= 0x03;
+        ioaddr->command_addr    ^= 0x03;
+#endif
+}
+
+static __devinit int ixp4xx_pata_probe(struct platform_device *pdev)
+{
+        int ret;
+        unsigned int irq;
+        struct resource *cs0, *cs1;
+        struct ata_probe_ent ae;
+
+        struct ixp4xx_pata_data *data = pdev->dev.platform_data;
+
+        cs0 = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        cs1 = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+
+        if (!cs0 || !cs1)
+                return -EINVAL;
+
+        pdev->dev.coherent_dma_mask = DMA_32BIT_MASK;
+
+        data->cs0 = ioremap(cs0->start, 0x1000);
+        data->cs1 = ioremap(cs1->start, 0x1000);
+
+        irq = platform_get_irq(pdev, 0);
+        if (irq)
+                set_irq_type(irq, IRQT_HIGH);
+
+        /* Setup expansion bus chip selects */
+        *data->cs0_cfg = data->cs0_bits;
+        *data->cs1_cfg = data->cs1_bits;
+
+        memset(&ae, 0, sizeof(struct ata_probe_ent));
+        INIT_LIST_HEAD(&ae.node);
+
+        ae.dev          = &pdev->dev;
+        ae.port_ops     = &ixp4xx_port_ops;
+        ae.sht          = &ixp4xx_sht;
+        ae.n_ports      = 1;
+        ae.pio_mask     = 0x1f; /* PIO4 */
+        ae.irq          = irq;
+        ae.irq_flags    = 0;
+        ae.port_flags   = ATA_FLAG_MMIO | ATA_FLAG_NO_LEGACY
+                        | ATA_FLAG_NO_ATAPI | ATA_FLAG_SRST;
+
+        /* run in polling mode if no irq has been assigned */
+        if (!irq)
+                ae.port_flags |= ATA_FLAG_PIO_POLLING;
+
+        ixp4xx_setup_port(&ae.port[0], data);
+
+        dev_printk(KERN_INFO, &pdev->dev, "version " DRV_VERSION "\n");
+
+        ret = ata_device_add(&ae);
+        if (ret == 0)
+                return -ENODEV;
+
+        return 0;
+}
+
+static __devexit int ixp4xx_pata_remove(struct platform_device *dev)
+{
+        struct ata_host *host = platform_get_drvdata(dev);
+
+        ata_host_remove(host);
+        platform_set_drvdata(dev, NULL);
+
+        return 0;
+}
+
+static struct platform_driver ixp4xx_pata_platform_driver = {
+        .driver  = {
+                .name   = DRV_NAME,
+                .owner  = THIS_MODULE,
+        },
+        .probe          = ixp4xx_pata_probe,
+        .remove         = __devexit_p(ixp4xx_pata_remove),
+};
+
+static int __init ixp4xx_pata_init(void)
+{
+        return platform_driver_register(&ixp4xx_pata_platform_driver);
+}
+
+static void __exit ixp4xx_pata_exit(void)
+{
+        platform_driver_unregister(&ixp4xx_pata_platform_driver);
+}
+
+MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
+MODULE_DESCRIPTION("low-level driver for ixp4xx Compact Flash PATA");
+MODULE_LICENSE("GPL");
+MODULE_VERSION(DRV_VERSION);
+
+module_init(ixp4xx_pata_init);
+module_exit(ixp4xx_pata_exit);