[libata] Add a bunch of PATA drivers.
The vast majority of drivers and changes are from Alan Cox. Albert Lee
contributed and maintains pata_pdc2027x. Adrian Bunk, Andrew Morton,
and Tejun Heo contributed various minor fixes and updates.
Signed-off-by: Jeff Garzik <jeff@garzik.org>
diff --git a/drivers/ata/pata_sc1200.c b/drivers/ata/pata_sc1200.c
new file mode 100644
index 0000000..9b42b9a
--- /dev/null
+++ b/drivers/ata/pata_sc1200.c
@@ -0,0 +1,287 @@
+/*
+ * New ATA layer SC1200 driver Alan Cox <alan@redhat.com>
+ *
+ * TODO: Mode selection filtering
+ * TODO: Can't enable second channel until ATA core has serialize
+ * TODO: Needs custom DMA cleanup code
+ *
+ * Based very heavily on
+ *
+ * linux/drivers/ide/pci/sc1200.c Version 0.91 28-Jan-2003
+ *
+ * Copyright (C) 2000-2002 Mark Lord <mlord@pobox.com>
+ * May be copied or modified under the terms of the GNU General Public License
+ *
+ * Development of this chipset driver was funded
+ * by the nice folks at National Semiconductor.
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/init.h>
+#include <linux/blkdev.h>
+#include <linux/delay.h>
+#include <scsi/scsi_host.h>
+#include <linux/libata.h>
+
+#define DRV_NAME "sc1200"
+#define DRV_VERSION "0.2.3"
+
+#define SC1200_REV_A 0x00
+#define SC1200_REV_B1 0x01
+#define SC1200_REV_B3 0x02
+#define SC1200_REV_C1 0x03
+#define SC1200_REV_D1 0x04
+
+/**
+ * sc1200_clock - PCI clock
+ *
+ * Return the PCI bus clocking for the SC1200 chipset configuration
+ * in use. We return 0 for 33MHz 1 for 48MHz and 2 for 66Mhz
+ */
+
+static int sc1200_clock(void)
+{
+ /* Magic registers that give us the chipset data */
+ u8 chip_id = inb(0x903C);
+ u8 silicon_rev = inb(0x903D);
+ u16 pci_clock;
+
+ if (chip_id == 0x04 && silicon_rev < SC1200_REV_B1)
+ return 0; /* 33 MHz mode */
+
+ /* Clock generator configuration 0x901E its 8/9 are the PCI clocking
+ 0/3 is 33Mhz 1 is 48 2 is 66 */
+
+ pci_clock = inw(0x901E);
+ pci_clock >>= 8;
+ pci_clock &= 0x03;
+ if (pci_clock == 3)
+ pci_clock = 0;
+ return pci_clock;
+}
+
+/**
+ * sc1200_set_piomode - PIO setup
+ * @ap: ATA interface
+ * @adev: device on the interface
+ *
+ * Set our PIO requirements. This is fairly simple on the SC1200
+ */
+
+static void sc1200_set_piomode(struct ata_port *ap, struct ata_device *adev)
+{
+ static const u32 pio_timings[4][5] = {
+ {0x00009172, 0x00012171, 0x00020080, 0x00032010, 0x00040010}, // format0 33Mhz
+ {0xd1329172, 0x71212171, 0x30200080, 0x20102010, 0x00100010}, // format1, 33Mhz
+ {0xfaa3f4f3, 0xc23232b2, 0x513101c1, 0x31213121, 0x10211021}, // format1, 48Mhz
+ {0xfff4fff4, 0xf35353d3, 0x814102f1, 0x42314231, 0x11311131} // format1, 66Mhz
+ };
+
+ struct pci_dev *pdev = to_pci_dev(ap->host->dev);
+ u32 format;
+ unsigned int reg = 0x40 + 0x10 * ap->port_no;
+ int mode = adev->pio_mode - XFER_PIO_0;
+
+ pci_read_config_dword(pdev, reg + 4, &format);
+ format >>= 31;
+ format += sc1200_clock();
+ pci_write_config_dword(pdev, reg + 8 * adev->devno,
+ pio_timings[format][mode]);
+}
+
+/**
+ * sc1200_set_dmamode - DMA timing setup
+ * @ap: ATA interface
+ * @adev: Device being configured
+ *
+ * We cannot mix MWDMA and UDMA without reloading timings each switch
+ * master to slave.
+ */
+
+static void sc1200_set_dmamode(struct ata_port *ap, struct ata_device *adev)
+{
+ static const u32 udma_timing[3][3] = {
+ { 0x00921250, 0x00911140, 0x00911030 },
+ { 0x00932470, 0x00922260, 0x00922140 },
+ { 0x009436A1, 0x00933481, 0x00923261 }
+ };
+
+ static const u32 mwdma_timing[3][3] = {
+ { 0x00077771, 0x00012121, 0x00002020 },
+ { 0x000BBBB2, 0x00024241, 0x00013131 },
+ { 0x000FFFF3, 0x00035352, 0x00015151 }
+ };
+
+ int clock = sc1200_clock();
+ struct pci_dev *pdev = to_pci_dev(ap->host->dev);
+ unsigned int reg = 0x40 + 0x10 * ap->port_no;
+ int mode = adev->dma_mode;
+ u32 format;
+
+ if (mode >= XFER_UDMA_0)
+ format = udma_timing[clock][mode - XFER_UDMA_0];
+ else
+ format = mwdma_timing[clock][mode - XFER_MW_DMA_0];
+
+ if (adev->devno == 0) {
+ u32 timings;
+
+ pci_read_config_dword(pdev, reg + 4, &timings);
+ timings &= 0x80000000UL;
+ timings |= format;
+ pci_write_config_dword(pdev, reg + 4, timings);
+ } else
+ pci_write_config_dword(pdev, reg + 12, format);
+}
+
+/**
+ * sc1200_qc_issue_prot - command issue
+ * @qc: command pending
+ *
+ * Called when the libata layer is about to issue a command. We wrap
+ * this interface so that we can load the correct ATA timings if
+ * neccessary. Specifically we have a problem that there is only
+ * one MWDMA/UDMA bit.
+ */
+
+static unsigned int sc1200_qc_issue_prot(struct ata_queued_cmd *qc)
+{
+ struct ata_port *ap = qc->ap;
+ struct ata_device *adev = qc->dev;
+ struct ata_device *prev = ap->private_data;
+
+ /* See if the DMA settings could be wrong */
+ if (adev->dma_mode != 0 && adev != prev && prev != NULL) {
+ /* Maybe, but do the channels match MWDMA/UDMA ? */
+ if ((adev->dma_mode >= XFER_UDMA_0 && prev->dma_mode < XFER_UDMA_0) ||
+ (adev->dma_mode < XFER_UDMA_0 && prev->dma_mode >= XFER_UDMA_0))
+ /* Switch the mode bits */
+ sc1200_set_dmamode(ap, adev);
+ }
+
+ return ata_qc_issue_prot(qc);
+}
+
+static struct scsi_host_template sc1200_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 sc1200_port_ops = {
+ .port_disable = ata_port_disable,
+ .set_piomode = sc1200_set_piomode,
+ .set_dmamode = sc1200_set_dmamode,
+ .mode_filter = ata_pci_default_filter,
+
+ .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,
+
+ .error_handler = ata_bmdma_error_handler,
+
+ .bmdma_setup = ata_bmdma_setup,
+ .bmdma_start = ata_bmdma_start,
+ .bmdma_stop = ata_bmdma_stop,
+ .bmdma_status = ata_bmdma_status,
+
+ .qc_prep = ata_qc_prep,
+ .qc_issue = sc1200_qc_issue_prot,
+ .eng_timeout = ata_eng_timeout,
+ .data_xfer = ata_pio_data_xfer,
+
+ .irq_handler = ata_interrupt,
+ .irq_clear = ata_bmdma_irq_clear,
+
+ .port_start = ata_port_start,
+ .port_stop = ata_port_stop,
+ .host_stop = ata_host_stop
+};
+
+/**
+ * sc1200_init_one - Initialise an SC1200
+ * @dev: PCI device
+ * @id: Entry in match table
+ *
+ * Just throw the needed data at the libata helper and it does all
+ * our work.
+ */
+
+static int sc1200_init_one(struct pci_dev *dev, const struct pci_device_id *id)
+{
+ static struct ata_port_info info = {
+ .sht = &sc1200_sht,
+ .flags = ATA_FLAG_SLAVE_POSS|ATA_FLAG_SRST,
+ .pio_mask = 0x1f,
+ .mwdma_mask = 0x07,
+ .udma_mask = 0x07,
+ .port_ops = &sc1200_port_ops
+ };
+ static struct ata_port_info *port_info[2] = { &info, &info };
+
+ /* Can't enable port 2 yet, see top comments */
+ return ata_pci_init_one(dev, port_info, 1);
+}
+
+static struct pci_device_id sc1200[] = {
+ { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_SCx200_IDE), },
+ { 0, },
+};
+
+static struct pci_driver sc1200_pci_driver = {
+ .name = DRV_NAME,
+ .id_table = sc1200,
+ .probe = sc1200_init_one,
+ .remove = ata_pci_remove_one
+};
+
+static int __init sc1200_init(void)
+{
+ return pci_register_driver(&sc1200_pci_driver);
+}
+
+
+static void __exit sc1200_exit(void)
+{
+ pci_unregister_driver(&sc1200_pci_driver);
+}
+
+
+MODULE_AUTHOR("Alan Cox, Mark Lord");
+MODULE_DESCRIPTION("low-level driver for the NS/AMD SC1200");
+MODULE_LICENSE("GPL");
+MODULE_DEVICE_TABLE(pci, sc1200);
+MODULE_VERSION(DRV_VERSION);
+
+module_init(sc1200_init);
+module_exit(sc1200_exit);