[libata] ARM: add ixp4xx PATA driver

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

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
 

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

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);

include/asm-arm/arch-ixp4xx/platform.h

@@ -86,6 +86,19 @@ struct ixp4xx_i2c_pins {
 	unsigned long scl_pin;
 };
 
+/*
+ * This structure provide a means for the board setup code
+ * to give information to th pata_ixp4xx driver. It is
+ * passed as platform_data.
+ */
+struct ixp4xx_pata_data {
+	volatile u32	*cs0_cfg;
+	volatile u32	*cs1_cfg;
+	unsigned long	cs0_bits;
+	unsigned long	cs1_bits;
+	void __iomem	*cs0;
+	void __iomem	*cs1;
+};
 
 struct sys_timer;