Fixed MTP to work with TWRP

drivers/ata/pata_opti.c

@@ -0,0 +1,199 @@
+/*
+ * pata_opti.c 	- ATI PATA for new ATA layer
+ *			  (C) 2005 Red Hat Inc
+ *
+ * Based on
+ *  linux/drivers/ide/pci/opti621.c		Version 0.7	Sept 10, 2002
+ *
+ *  Copyright (C) 1996-1998  Linus Torvalds & authors (see below)
+ *
+ * Authors:
+ * Jaromir Koutek <miri@punknet.cz>,
+ * Jan Harkes <jaharkes@cwi.nl>,
+ * Mark Lord <mlord@pobox.com>
+ * Some parts of code are from ali14xx.c and from rz1000.c.
+ *
+ * Also consulted the FreeBSD prototype driver by Kevin Day to try
+ * and resolve some confusions. Further documentation can be found in
+ * Ralf Brown's interrupt list
+ *
+ * If you have other variants of the Opti range (Viper/Vendetta) please
+ * try this driver with those PCI idents and report back. For the later
+ * chips see the pata_optidma driver
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/blkdev.h>
+#include <linux/delay.h>
+#include <scsi/scsi_host.h>
+#include <linux/libata.h>
+
+#define DRV_NAME "pata_opti"
+#define DRV_VERSION "0.2.9"
+
+enum {
+	READ_REG	= 0,	/* index of Read cycle timing register */
+	WRITE_REG 	= 1,	/* index of Write cycle timing register */
+	CNTRL_REG 	= 3,	/* index of Control register */
+	STRAP_REG 	= 5,	/* index of Strap register */
+	MISC_REG 	= 6	/* index of Miscellaneous register */
+};
+
+/**
+ *	opti_pre_reset		-	probe begin
+ *	@link: ATA link
+ *	@deadline: deadline jiffies for the operation
+ *
+ *	Set up cable type and use generic probe init
+ */
+
+static int opti_pre_reset(struct ata_link *link, unsigned long deadline)
+{
+	struct ata_port *ap = link->ap;
+	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
+	static const struct pci_bits opti_enable_bits[] = {
+		{ 0x45, 1, 0x80, 0x00 },
+		{ 0x40, 1, 0x08, 0x00 }
+	};
+
+	if (!pci_test_config_bits(pdev, &opti_enable_bits[ap->port_no]))
+		return -ENOENT;
+
+	return ata_sff_prereset(link, deadline);
+}
+
+/**
+ *	opti_write_reg		-	control register setup
+ *	@ap: ATA port
+ *	@value: value
+ *	@reg: control register number
+ *
+ *	The Opti uses magic 'trapdoor' register accesses to do configuration
+ *	rather than using PCI space as other controllers do. The double inw
+ *	on the error register activates configuration mode. We can then write
+ *	the control register
+ */
+
+static void opti_write_reg(struct ata_port *ap, u8 val, int reg)
+{
+	void __iomem *regio = ap->ioaddr.cmd_addr;
+
+	/* These 3 unlock the control register access */
+	ioread16(regio + 1);
+	ioread16(regio + 1);
+	iowrite8(3, regio + 2);
+
+	/* Do the I/O */
+	iowrite8(val, regio + reg);
+
+	/* Relock */
+	iowrite8(0x83, regio + 2);
+}
+
+/**
+ *	opti_set_piomode	-	set initial PIO mode data
+ *	@ap: ATA interface
+ *	@adev: ATA device
+ *
+ *	Called to do the PIO mode setup. Timing numbers are taken from
+ *	the FreeBSD driver then pre computed to keep the code clean. There
+ *	are two tables depending on the hardware clock speed.
+ */
+
+static void opti_set_piomode(struct ata_port *ap, struct ata_device *adev)
+{
+	struct ata_device *pair = ata_dev_pair(adev);
+	int clock;
+	int pio = adev->pio_mode - XFER_PIO_0;
+	void __iomem *regio = ap->ioaddr.cmd_addr;
+	u8 addr;
+
+	/* Address table precomputed with prefetch off and a DCLK of 2 */
+	static const u8 addr_timing[2][5] = {
+		{ 0x30, 0x20, 0x20, 0x10, 0x10 },
+		{ 0x20, 0x20, 0x10, 0x10, 0x10 }
+	};
+	static const u8 data_rec_timing[2][5] = {
+		{ 0x6B, 0x56, 0x42, 0x32, 0x31 },
+		{ 0x58, 0x44, 0x32, 0x22, 0x21 }
+	};
+
+	iowrite8(0xff, regio + 5);
+	clock = ioread16(regio + 5) & 1;
+
+	/*
+ 	 *	As with many controllers the address setup time is shared
+ 	 *	and must suit both devices if present.
+	 */
+
+	addr = addr_timing[clock][pio];
+	if (pair) {
+		/* Hardware constraint */
+		u8 pair_addr = addr_timing[clock][pair->pio_mode - XFER_PIO_0];
+		if (pair_addr > addr)
+			addr = pair_addr;
+	}
+
+	/* Commence primary programming sequence */
+	opti_write_reg(ap, adev->devno, MISC_REG);
+	opti_write_reg(ap, data_rec_timing[clock][pio], READ_REG);
+	opti_write_reg(ap, data_rec_timing[clock][pio], WRITE_REG);
+	opti_write_reg(ap, addr, MISC_REG);
+
+	/* Programming sequence complete, override strapping */
+	opti_write_reg(ap, 0x85, CNTRL_REG);
+}
+
+static struct scsi_host_template opti_sht = {
+	ATA_PIO_SHT(DRV_NAME),
+};
+
+static struct ata_port_operations opti_port_ops = {
+	.inherits	= &ata_sff_port_ops,
+	.cable_detect	= ata_cable_40wire,
+	.set_piomode	= opti_set_piomode,
+	.prereset	= opti_pre_reset,
+};
+
+static int opti_init_one(struct pci_dev *dev, const struct pci_device_id *id)
+{
+	static const struct ata_port_info info = {
+		.flags = ATA_FLAG_SLAVE_POSS,
+		.pio_mask = ATA_PIO4,
+		.port_ops = &opti_port_ops
+	};
+	const struct ata_port_info *ppi[] = { &info, NULL };
+
+	ata_print_version_once(&dev->dev, DRV_VERSION);
+
+	return ata_pci_sff_init_one(dev, ppi, &opti_sht, NULL, 0);
+}
+
+static const struct pci_device_id opti[] = {
+	{ PCI_VDEVICE(OPTI, PCI_DEVICE_ID_OPTI_82C621), 0 },
+	{ PCI_VDEVICE(OPTI, PCI_DEVICE_ID_OPTI_82C825), 1 },
+
+	{ },
+};
+
+static struct pci_driver opti_pci_driver = {
+	.name 		= DRV_NAME,
+	.id_table	= opti,
+	.probe 		= opti_init_one,
+	.remove		= ata_pci_remove_one,
+#ifdef CONFIG_PM_SLEEP
+	.suspend	= ata_pci_device_suspend,
+	.resume		= ata_pci_device_resume,
+#endif
+};
+
+module_pci_driver(opti_pci_driver);
+
+MODULE_AUTHOR("Alan Cox");
+MODULE_DESCRIPTION("low-level driver for Opti 621/621X");
+MODULE_LICENSE("GPL");
+MODULE_DEVICE_TABLE(pci, opti);
+MODULE_VERSION(DRV_VERSION);