1 files changed, 297 insertions, 0 deletions
diff --git a/drivers/ata/pata_cs5520.c b/drivers/ata/pata_cs5520.c
new file mode 100644
index 000000000..f4289a532
--- /dev/null
+++ b/drivers/ata/pata_cs5520.c
@@ -0,0 +1,297 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *	IDE tuning and bus mastering support for the CS5510/CS5520
+ *	chipsets
+ *
+ *	The CS5510/CS5520 are slightly unusual devices. Unlike the
+ *	typical IDE controllers they do bus mastering with the drive in
+ *	PIO mode and smarter silicon.
+ *
+ *	The practical upshot of this is that we must always tune the
+ *	drive for the right PIO mode. We must also ignore all the blacklists
+ *	and the drive bus mastering DMA information. Also to confuse matters
+ *	further we can do DMA on PIO only drives.
+ *
+ *	DMA on the 5510 also requires we disable_hlt() during DMA on early
+ *	revisions.
+ *
+ *	*** This driver is strictly experimental ***
+ *
+ *	(c) Copyright Red Hat Inc 2002
+ *
+ * Documentation:
+ *	Not publicly available.
+ */
+#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_cs5520"
+#define DRV_VERSION	"0.6.6"
+
+struct pio_clocks
+{
+	int address;
+	int assert;
+	int recovery;
+};
+
+static const struct pio_clocks cs5520_pio_clocks[]={
+	{3, 6, 11},
+	{2, 5, 6},
+	{1, 4, 3},
+	{1, 3, 2},
+	{1, 2, 1}
+};
+
+/**
+ *	cs5520_set_timings	-	program PIO timings
+ *	@ap: ATA port
+ *	@adev: ATA device
+ *	@pio: PIO ID
+ *
+ *	Program the PIO mode timings for the controller according to the pio
+ *	clocking table.
+ */
+
+static void cs5520_set_timings(struct ata_port *ap, struct ata_device *adev, int pio)
+{
+	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
+	int slave = adev->devno;
+
+	pio -= XFER_PIO_0;
+
+	/* Channel command timing */
+	pci_write_config_byte(pdev, 0x62 + ap->port_no,
+				(cs5520_pio_clocks[pio].recovery << 4) |
+				(cs5520_pio_clocks[pio].assert));
+	/* FIXME: should these use address ? */
+	/* Read command timing */
+	pci_write_config_byte(pdev, 0x64 +  4*ap->port_no + slave,
+				(cs5520_pio_clocks[pio].recovery << 4) |
+				(cs5520_pio_clocks[pio].assert));
+	/* Write command timing */
+	pci_write_config_byte(pdev, 0x66 +  4*ap->port_no + slave,
+				(cs5520_pio_clocks[pio].recovery << 4) |
+				(cs5520_pio_clocks[pio].assert));
+}
+
+/**
+ *	cs5520_set_piomode	-	program PIO timings
+ *	@ap: ATA port
+ *	@adev: ATA device
+ *
+ *	Program the PIO mode timings for the controller according to the pio
+ *	clocking table.
+ */
+
+static void cs5520_set_piomode(struct ata_port *ap, struct ata_device *adev)
+{
+	cs5520_set_timings(ap, adev, adev->pio_mode);
+}
+
+static struct scsi_host_template cs5520_sht = {
+	ATA_BASE_SHT(DRV_NAME),
+	.sg_tablesize		= LIBATA_DUMB_MAX_PRD,
+	.dma_boundary		= ATA_DMA_BOUNDARY,
+};
+
+static struct ata_port_operations cs5520_port_ops = {
+	.inherits		= &ata_bmdma_port_ops,
+	.qc_prep		= ata_bmdma_dumb_qc_prep,
+	.cable_detect		= ata_cable_40wire,
+	.set_piomode		= cs5520_set_piomode,
+};
+
+static int cs5520_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
+{
+	static const unsigned int cmd_port[] = { 0x1F0, 0x170 };
+	static const unsigned int ctl_port[] = { 0x3F6, 0x376 };
+	struct ata_port_info pi = {
+		.flags		= ATA_FLAG_SLAVE_POSS,
+		.pio_mask	= ATA_PIO4,
+		.port_ops	= &cs5520_port_ops,
+	};
+	const struct ata_port_info *ppi[2];
+	u8 pcicfg;
+	void __iomem *iomap[5];
+	struct ata_host *host;
+	struct ata_ioports *ioaddr;
+	int i, rc;
+
+	rc = pcim_enable_device(pdev);
+	if (rc)
+		return rc;
+
+	/* IDE port enable bits */
+	pci_read_config_byte(pdev, 0x60, &pcicfg);
+
+	/* Check if the ATA ports are enabled */
+	if ((pcicfg & 3) == 0)
+		return -ENODEV;
+
+	ppi[0] = ppi[1] = &ata_dummy_port_info;
+	if (pcicfg & 1)
+		ppi[0] = &pi;
+	if (pcicfg & 2)
+		ppi[1] = &pi;
+
+	if ((pcicfg & 0x40) == 0) {
+		dev_warn(&pdev->dev, "DMA mode disabled. Enabling.\n");
+		pci_write_config_byte(pdev, 0x60, pcicfg | 0x40);
+	}
+
+	pi.mwdma_mask = id->driver_data;
+
+	host = ata_host_alloc_pinfo(&pdev->dev, ppi, 2);
+	if (!host)
+		return -ENOMEM;
+
+	/* Perform set up for DMA */
+	if (pci_enable_device_io(pdev)) {
+		dev_err(&pdev->dev, "unable to configure BAR2.\n");
+		return -ENODEV;
+	}
+
+	if (dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32))) {
+		dev_err(&pdev->dev, "unable to configure DMA mask.\n");
+		return -ENODEV;
+	}
+
+	/* Map IO ports and initialize host accordingly */
+	iomap[0] = devm_ioport_map(&pdev->dev, cmd_port[0], 8);
+	iomap[1] = devm_ioport_map(&pdev->dev, ctl_port[0], 1);
+	iomap[2] = devm_ioport_map(&pdev->dev, cmd_port[1], 8);
+	iomap[3] = devm_ioport_map(&pdev->dev, ctl_port[1], 1);
+	iomap[4] = pcim_iomap(pdev, 2, 0);
+
+	if (!iomap[0] || !iomap[1] || !iomap[2] || !iomap[3] || !iomap[4])
+		return -ENOMEM;
+
+	ioaddr = &host->ports[0]->ioaddr;
+	ioaddr->cmd_addr = iomap[0];
+	ioaddr->ctl_addr = iomap[1];
+	ioaddr->altstatus_addr = iomap[1];
+	ioaddr->bmdma_addr = iomap[4];
+	ata_sff_std_ports(ioaddr);
+
+	ata_port_desc(host->ports[0],
+		      "cmd 0x%x ctl 0x%x", cmd_port[0], ctl_port[0]);
+	ata_port_pbar_desc(host->ports[0], 4, 0, "bmdma");
+
+	ioaddr = &host->ports[1]->ioaddr;
+	ioaddr->cmd_addr = iomap[2];
+	ioaddr->ctl_addr = iomap[3];
+	ioaddr->altstatus_addr = iomap[3];
+	ioaddr->bmdma_addr = iomap[4] + 8;
+	ata_sff_std_ports(ioaddr);
+
+	ata_port_desc(host->ports[1],
+		      "cmd 0x%x ctl 0x%x", cmd_port[1], ctl_port[1]);
+	ata_port_pbar_desc(host->ports[1], 4, 8, "bmdma");
+
+	/* activate the host */
+	pci_set_master(pdev);
+	rc = ata_host_start(host);
+	if (rc)
+		return rc;
+
+	for (i = 0; i < 2; i++) {
+		static const int irq[] = { 14, 15 };
+		struct ata_port *ap = host->ports[i];
+
+		if (ata_port_is_dummy(ap))
+			continue;
+
+		rc = devm_request_irq(&pdev->dev, irq[ap->port_no],
+				      ata_bmdma_interrupt, 0, DRV_NAME, host);
+		if (rc)
+			return rc;
+
+		ata_port_desc(ap, "irq %d", irq[i]);
+	}
+
+	return ata_host_register(host, &cs5520_sht);
+}
+
+#ifdef CONFIG_PM_SLEEP
+/**
+ *	cs5520_reinit_one	-	device resume
+ *	@pdev: PCI device
+ *
+ *	Do any reconfiguration work needed by a resume from RAM. We need
+ *	to restore DMA mode support on BIOSen which disabled it
+ */
+
+static int cs5520_reinit_one(struct pci_dev *pdev)
+{
+	struct ata_host *host = pci_get_drvdata(pdev);
+	u8 pcicfg;
+	int rc;
+
+	rc = ata_pci_device_do_resume(pdev);
+	if (rc)
+		return rc;
+
+	pci_read_config_byte(pdev, 0x60, &pcicfg);
+	if ((pcicfg & 0x40) == 0)
+		pci_write_config_byte(pdev, 0x60, pcicfg | 0x40);
+
+	ata_host_resume(host);
+	return 0;
+}
+
+/**
+ *	cs5520_pci_device_suspend	-	device suspend
+ *	@pdev: PCI device
+ *	@mesg: PM event message
+ *
+ *	We have to cut and waste bits from the standard method because
+ *	the 5520 is a bit odd and not just a pure ATA device. As a result
+ *	we must not disable it. The needed code is short and this avoids
+ *	chip specific mess in the core code.
+ */
+
+static int cs5520_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
+{
+	struct ata_host *host = pci_get_drvdata(pdev);
+
+	ata_host_suspend(host, mesg);
+
+	pci_save_state(pdev);
+	return 0;
+}
+#endif /* CONFIG_PM_SLEEP */
+
+/* For now keep DMA off. We can set it for all but A rev CS5510 once the
+   core ATA code can handle it */
+
+static const struct pci_device_id pata_cs5520[] = {
+	{ PCI_VDEVICE(CYRIX, PCI_DEVICE_ID_CYRIX_5510), },
+	{ PCI_VDEVICE(CYRIX, PCI_DEVICE_ID_CYRIX_5520), },
+
+	{ },
+};
+
+static struct pci_driver cs5520_pci_driver = {
+	.name 		= DRV_NAME,
+	.id_table	= pata_cs5520,
+	.probe 		= cs5520_init_one,
+	.remove		= ata_pci_remove_one,
+#ifdef CONFIG_PM_SLEEP
+	.suspend	= cs5520_pci_device_suspend,
+	.resume		= cs5520_reinit_one,
+#endif
+};
+
+module_pci_driver(cs5520_pci_driver);
+
+MODULE_AUTHOR("Alan Cox");
+MODULE_DESCRIPTION("low-level driver for Cyrix CS5510/5520");
+MODULE_LICENSE("GPL");
+MODULE_DEVICE_TABLE(pci, pata_cs5520);
+MODULE_VERSION(DRV_VERSION);