Fixed MTP to work with TWRP

drivers/ata/pata_ixp4xx_cf.c

@@ -0,0 +1,208 @@
+/*
+ * ixp4xx PATA/Compact Flash driver
+ * Copyright (C) 2006-07 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. In the irq is not available, you might
+ * want to modify both this driver and libata to 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	"0.2"
+
+static int ixp4xx_set_mode(struct ata_link *link, struct ata_device **error)
+{
+	struct ata_device *dev;
+
+	ata_for_each_dev(dev, link, ENABLED) {
+		ata_dev_info(dev, "configured for PIO0\n");
+		dev->pio_mode = XFER_PIO_0;
+		dev->xfer_mode = XFER_PIO_0;
+		dev->xfer_shift = ATA_SHIFT_PIO;
+		dev->flags |= ATA_DFLAG_PIO;
+	}
+	return 0;
+}
+
+static unsigned int ixp4xx_mmio_data_xfer(struct ata_device *dev,
+				unsigned char *buf, unsigned int buflen, int rw)
+{
+	unsigned int i;
+	unsigned int words = buflen >> 1;
+	u16 *buf16 = (u16 *) buf;
+	struct ata_port *ap = dev->link->ap;
+	void __iomem *mmio = ap->ioaddr.data_addr;
+	struct ixp4xx_pata_data *data = dev_get_platdata(ap->host->dev);
+
+	/* 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 (rw == READ)
+		for (i = 0; i < words; i++)
+			buf16[i] = readw(mmio);
+	else
+		for (i = 0; i < words; i++)
+			writew(buf16[i], mmio);
+
+	/* Transfer trailing 1 byte, if any. */
+	if (unlikely(buflen & 0x01)) {
+		u16 align_buf[1] = { 0 };
+		unsigned char *trailing_buf = buf + buflen - 1;
+
+		if (rw == READ) {
+			align_buf[0] = readw(mmio);
+			memcpy(trailing_buf, align_buf, 1);
+		} else {
+			memcpy(align_buf, trailing_buf, 1);
+			writew(align_buf[0], mmio);
+		}
+		words++;
+	}
+
+	udelay(100);
+	*data->cs0_cfg |= 0x01;
+
+	return words << 1;
+}
+
+static struct scsi_host_template ixp4xx_sht = {
+	ATA_PIO_SHT(DRV_NAME),
+};
+
+static struct ata_port_operations ixp4xx_port_ops = {
+	.inherits		= &ata_sff_port_ops,
+	.sff_data_xfer		= ixp4xx_mmio_data_xfer,
+	.cable_detect		= ata_cable_40wire,
+	.set_mode		= ixp4xx_set_mode,
+};
+
+static void ixp4xx_setup_port(struct ata_port *ap,
+			      struct ixp4xx_pata_data *data,
+			      unsigned long raw_cs0, unsigned long raw_cs1)
+{
+	struct ata_ioports *ioaddr = &ap->ioaddr;
+	unsigned long raw_cmd = raw_cs0;
+	unsigned long raw_ctl = raw_cs1 + 0x06;
+
+	ioaddr->cmd_addr	= data->cs0;
+	ioaddr->altstatus_addr	= data->cs1 + 0x06;
+	ioaddr->ctl_addr	= data->cs1 + 0x06;
+
+	ata_sff_std_ports(ioaddr);
+
+#ifndef __ARMEB__
+
+	/* adjust the addresses to handle the address swizzling of the
+	 * ixp4xx in little endian mode.
+	 */
+
+	*(unsigned long *)&ioaddr->data_addr		^= 0x02;
+	*(unsigned long *)&ioaddr->cmd_addr		^= 0x03;
+	*(unsigned long *)&ioaddr->altstatus_addr	^= 0x03;
+	*(unsigned long *)&ioaddr->ctl_addr		^= 0x03;
+	*(unsigned long *)&ioaddr->error_addr		^= 0x03;
+	*(unsigned long *)&ioaddr->feature_addr		^= 0x03;
+	*(unsigned long *)&ioaddr->nsect_addr		^= 0x03;
+	*(unsigned long *)&ioaddr->lbal_addr		^= 0x03;
+	*(unsigned long *)&ioaddr->lbam_addr		^= 0x03;
+	*(unsigned long *)&ioaddr->lbah_addr		^= 0x03;
+	*(unsigned long *)&ioaddr->device_addr		^= 0x03;
+	*(unsigned long *)&ioaddr->status_addr		^= 0x03;
+	*(unsigned long *)&ioaddr->command_addr		^= 0x03;
+
+	raw_cmd ^= 0x03;
+	raw_ctl ^= 0x03;
+#endif
+
+	ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx", raw_cmd, raw_ctl);
+}
+
+static int ixp4xx_pata_probe(struct platform_device *pdev)
+{
+	unsigned int irq;
+	struct resource *cs0, *cs1;
+	struct ata_host *host;
+	struct ata_port *ap;
+	struct ixp4xx_pata_data *data = dev_get_platdata(&pdev->dev);
+	int ret;
+
+	cs0 = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	cs1 = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+
+	if (!cs0 || !cs1)
+		return -EINVAL;
+
+	/* allocate host */
+	host = ata_host_alloc(&pdev->dev, 1);
+	if (!host)
+		return -ENOMEM;
+
+	/* acquire resources and fill host */
+	ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
+	if (ret)
+		return ret;
+
+	data->cs0 = devm_ioremap(&pdev->dev, cs0->start, 0x1000);
+	data->cs1 = devm_ioremap(&pdev->dev, cs1->start, 0x1000);
+
+	if (!data->cs0 || !data->cs1)
+		return -ENOMEM;
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq)
+		irq_set_irq_type(irq, IRQ_TYPE_EDGE_RISING);
+
+	/* Setup expansion bus chip selects */
+	*data->cs0_cfg = data->cs0_bits;
+	*data->cs1_cfg = data->cs1_bits;
+
+	ap = host->ports[0];
+
+	ap->ops	= &ixp4xx_port_ops;
+	ap->pio_mask = ATA_PIO4;
+	ap->flags |= ATA_FLAG_NO_ATAPI;
+
+	ixp4xx_setup_port(ap, data, cs0->start, cs1->start);
+
+	ata_print_version_once(&pdev->dev, DRV_VERSION);
+
+	/* activate host */
+	return ata_host_activate(host, irq, ata_sff_interrupt, 0, &ixp4xx_sht);
+}
+
+static struct platform_driver ixp4xx_pata_platform_driver = {
+	.driver	 = {
+		.name   = DRV_NAME,
+		.owner  = THIS_MODULE,
+	},
+	.probe		= ixp4xx_pata_probe,
+	.remove		= ata_platform_remove_one,
+};
+
+module_platform_driver(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_ALIAS("platform:" DRV_NAME);