1 files changed, 299 insertions, 0 deletions
diff --git a/drivers/ata/pata_it8213.c b/drivers/ata/pata_it8213.c
new file mode 100644
index 000000000..8a3e87781
--- /dev/null
+++ b/drivers/ata/pata_it8213.c
@@ -0,0 +1,299 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ *    pata_it8213.c - iTE Tech. Inc.  IT8213 PATA driver
+ *
+ *    The IT8213 is a very Intel ICH like device for timing purposes, having
+ *    a similar register layout and the same split clock arrangement. Cable
+ *    detection is different, and it does not have slave channels or all the
+ *    clutter of later ICH/SATA setups.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/blkdev.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <scsi/scsi_host.h>
+#include <linux/libata.h>
+#include <linux/ata.h>
+
+#define DRV_NAME	"pata_it8213"
+#define DRV_VERSION	"0.0.3"
+
+/**
+ *	it8213_pre_reset	-	probe begin
+ *	@link: link
+ *	@deadline: deadline jiffies for the operation
+ *
+ *	Filter out ports by the enable bits before doing the normal reset
+ *	and probe.
+ */
+
+static int it8213_pre_reset(struct ata_link *link, unsigned long deadline)
+{
+	static const struct pci_bits it8213_enable_bits[] = {
+		{ 0x41U, 1U, 0x80UL, 0x80UL },	/* port 0 */
+	};
+	struct ata_port *ap = link->ap;
+	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
+	if (!pci_test_config_bits(pdev, &it8213_enable_bits[ap->port_no]))
+		return -ENOENT;
+
+	return ata_sff_prereset(link, deadline);
+}
+
+/**
+ *	it8213_cable_detect	-	check for 40/80 pin
+ *	@ap: Port
+ *
+ *	Perform cable detection for the 8213 ATA interface. This is
+ *	different to the PIIX arrangement
+ */
+
+static int it8213_cable_detect(struct ata_port *ap)
+{
+	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
+	u8 tmp;
+	pci_read_config_byte(pdev, 0x42, &tmp);
+	if (tmp & 2)	/* The initial docs are incorrect */
+		return ATA_CBL_PATA40;
+	return ATA_CBL_PATA80;
+}
+
+/**
+ *	it8213_set_piomode - Initialize host controller PATA PIO timings
+ *	@ap: Port whose timings we are configuring
+ *	@adev: Device whose timings we are configuring
+ *
+ *	Set PIO mode for device, in host controller PCI config space.
+ *
+ *	LOCKING:
+ *	None (inherited from caller).
+ */
+
+static void it8213_set_piomode (struct ata_port *ap, struct ata_device *adev)
+{
+	unsigned int pio	= adev->pio_mode - XFER_PIO_0;
+	struct pci_dev *dev	= to_pci_dev(ap->host->dev);
+	unsigned int master_port = ap->port_no ? 0x42 : 0x40;
+	u16 master_data;
+	int control = 0;
+
+	/*
+	 *	See Intel Document 298600-004 for the timing programing rules
+	 *	for PIIX/ICH. The 8213 is a clone so very similar
+	 */
+
+	static const	 /* ISP  RTC */
+	u8 timings[][2]	= { { 0, 0 },
+			    { 0, 0 },
+			    { 1, 0 },
+			    { 2, 1 },
+			    { 2, 3 }, };
+
+	if (pio > 1)
+		control |= 1;	/* TIME */
+	if (ata_pio_need_iordy(adev))	/* PIO 3/4 require IORDY */
+		control |= 2;	/* IE */
+	/* Bit 2 is set for ATAPI on the IT8213 - reverse of ICH/PIIX */
+	if (adev->class != ATA_DEV_ATA)
+		control |= 4;	/* PPE */
+
+	pci_read_config_word(dev, master_port, &master_data);
+
+	/* Set PPE, IE, and TIME as appropriate */
+	if (adev->devno == 0) {
+		master_data &= 0xCCF0;
+		master_data |= control;
+		master_data |= (timings[pio][0] << 12) |
+			(timings[pio][1] << 8);
+	} else {
+		u8 slave_data;
+
+		master_data &= 0xFF0F;
+		master_data |= (control << 4);
+
+		/* Slave timing in separate register */
+		pci_read_config_byte(dev, 0x44, &slave_data);
+		slave_data &= 0xF0;
+		slave_data |= (timings[pio][0] << 2) | timings[pio][1];
+		pci_write_config_byte(dev, 0x44, slave_data);
+	}
+
+	master_data |= 0x4000;	/* Ensure SITRE is set */
+	pci_write_config_word(dev, master_port, master_data);
+}
+
+/**
+ *	it8213_set_dmamode - Initialize host controller PATA DMA timings
+ *	@ap: Port whose timings we are configuring
+ *	@adev: Device to program
+ *
+ *	Set UDMA/MWDMA mode for device, in host controller PCI config space.
+ *	This device is basically an ICH alike.
+ *
+ *	LOCKING:
+ *	None (inherited from caller).
+ */
+
+static void it8213_set_dmamode (struct ata_port *ap, struct ata_device *adev)
+{
+	struct pci_dev *dev	= to_pci_dev(ap->host->dev);
+	u16 master_data;
+	u8 speed		= adev->dma_mode;
+	int devid		= adev->devno;
+	u8 udma_enable;
+
+	static const	 /* ISP  RTC */
+	u8 timings[][2]	= { { 0, 0 },
+			    { 0, 0 },
+			    { 1, 0 },
+			    { 2, 1 },
+			    { 2, 3 }, };
+
+	pci_read_config_word(dev, 0x40, &master_data);
+	pci_read_config_byte(dev, 0x48, &udma_enable);
+
+	if (speed >= XFER_UDMA_0) {
+		unsigned int udma = adev->dma_mode - XFER_UDMA_0;
+		u16 udma_timing;
+		u16 ideconf;
+		int u_clock, u_speed;
+
+		/* Clocks follow the PIIX style */
+		u_speed = min(2 - (udma & 1), udma);
+		if (udma > 4)
+			u_clock = 0x1000;	/* 100Mhz */
+		else if (udma > 2)
+			u_clock = 1;		/* 66Mhz */
+		else
+			u_clock = 0;		/* 33Mhz */
+
+		udma_enable |= (1 << devid);
+
+		/* Load the UDMA cycle time */
+		pci_read_config_word(dev, 0x4A, &udma_timing);
+		udma_timing &= ~(3 << (4 * devid));
+		udma_timing |= u_speed << (4 * devid);
+		pci_write_config_word(dev, 0x4A, udma_timing);
+
+		/* Load the clock selection */
+		pci_read_config_word(dev, 0x54, &ideconf);
+		ideconf &= ~(0x1001 << devid);
+		ideconf |= u_clock << devid;
+		pci_write_config_word(dev, 0x54, ideconf);
+	} else {
+		/*
+		 * MWDMA is driven by the PIO timings. We must also enable
+		 * IORDY unconditionally along with TIME1. PPE has already
+		 * been set when the PIO timing was set.
+		 */
+		unsigned int mwdma	= adev->dma_mode - XFER_MW_DMA_0;
+		unsigned int control;
+		u8 slave_data;
+		static const unsigned int needed_pio[3] = {
+			XFER_PIO_0, XFER_PIO_3, XFER_PIO_4
+		};
+		int pio = needed_pio[mwdma] - XFER_PIO_0;
+
+		control = 3;	/* IORDY|TIME1 */
+
+		/* If the drive MWDMA is faster than it can do PIO then
+		   we must force PIO into PIO0 */
+
+		if (adev->pio_mode < needed_pio[mwdma])
+			/* Enable DMA timing only */
+			control |= 8;	/* PIO cycles in PIO0 */
+
+		if (devid) {	/* Slave */
+			master_data &= 0xFF4F;  /* Mask out IORDY|TIME1|DMAONLY */
+			master_data |= control << 4;
+			pci_read_config_byte(dev, 0x44, &slave_data);
+			slave_data &= 0xF0;
+			/* Load the matching timing */
+			slave_data |= ((timings[pio][0] << 2) | timings[pio][1]) << (ap->port_no ? 4 : 0);
+			pci_write_config_byte(dev, 0x44, slave_data);
+		} else { 	/* Master */
+			master_data &= 0xCCF4;	/* Mask out IORDY|TIME1|DMAONLY
+						   and master timing bits */
+			master_data |= control;
+			master_data |=
+				(timings[pio][0] << 12) |
+				(timings[pio][1] << 8);
+		}
+		udma_enable &= ~(1 << devid);
+		pci_write_config_word(dev, 0x40, master_data);
+	}
+	pci_write_config_byte(dev, 0x48, udma_enable);
+}
+
+static struct scsi_host_template it8213_sht = {
+	ATA_BMDMA_SHT(DRV_NAME),
+};
+
+
+static struct ata_port_operations it8213_ops = {
+	.inherits		= &ata_bmdma_port_ops,
+	.cable_detect		= it8213_cable_detect,
+	.set_piomode		= it8213_set_piomode,
+	.set_dmamode		= it8213_set_dmamode,
+	.prereset		= it8213_pre_reset,
+};
+
+
+/**
+ *	it8213_init_one - Register 8213 ATA PCI device with kernel services
+ *	@pdev: PCI device to register
+ *	@ent: Entry in it8213_pci_tbl matching with @pdev
+ *
+ *	Called from kernel PCI layer.
+ *
+ *	LOCKING:
+ *	Inherited from PCI layer (may sleep).
+ *
+ *	RETURNS:
+ *	Zero on success, or -ERRNO value.
+ */
+
+static int it8213_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
+{
+	static const struct ata_port_info info = {
+		.flags		= ATA_FLAG_SLAVE_POSS,
+		.pio_mask	= ATA_PIO4,
+		.mwdma_mask	= ATA_MWDMA12_ONLY,
+		.udma_mask	= ATA_UDMA6,
+		.port_ops	= &it8213_ops,
+	};
+	/* Current IT8213 stuff is single port */
+	const struct ata_port_info *ppi[] = { &info, &ata_dummy_port_info };
+
+	ata_print_version_once(&pdev->dev, DRV_VERSION);
+
+	return ata_pci_bmdma_init_one(pdev, ppi, &it8213_sht, NULL, 0);
+}
+
+static const struct pci_device_id it8213_pci_tbl[] = {
+	{ PCI_VDEVICE(ITE, PCI_DEVICE_ID_ITE_8213), },
+
+	{ }	/* terminate list */
+};
+
+static struct pci_driver it8213_pci_driver = {
+	.name			= DRV_NAME,
+	.id_table		= it8213_pci_tbl,
+	.probe			= it8213_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(it8213_pci_driver);
+
+MODULE_AUTHOR("Alan Cox");
+MODULE_DESCRIPTION("SCSI low-level driver for the ITE 8213");
+MODULE_LICENSE("GPL");
+MODULE_DEVICE_TABLE(pci, it8213_pci_tbl);
+MODULE_VERSION(DRV_VERSION);