--- /dev/null
+/*
+ * Libata driver for the highpoint 372N and 302N UDMA66 ATA controllers.
+ *
+ * This driver is heavily based upon:
+ *
+ * linux/drivers/ide/pci/hpt366.c Version 0.36 April 25, 2003
+ *
+ * Copyright (C) 1999-2003 Andre Hedrick <andre@linux-ide.org>
+ * Portions Copyright (C) 2001 Sun Microsystems, Inc.
+ * Portions Copyright (C) 2003 Red Hat Inc
+ *
+ *
+ * TODO
+ * 371N
+ * Work out best PLL policy
+ */
+
+#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 "pata_hpt3x2n"
+#define DRV_VERSION "0.3.2"
+
+enum {
+ HPT_PCI_FAST = (1 << 31),
+ PCI66 = (1 << 1),
+ USE_DPLL = (1 << 0)
+};
+
+struct hpt_clock {
+ u8 xfer_speed;
+ u32 timing;
+};
+
+struct hpt_chip {
+ const char *name;
+ struct hpt_clock *clocks[3];
+};
+
+/* key for bus clock timings
+ * bit
+ * 0:3 data_high_time. inactive time of DIOW_/DIOR_ for PIO and MW
+ * DMA. cycles = value + 1
+ * 4:8 data_low_time. active time of DIOW_/DIOR_ for PIO and MW
+ * DMA. cycles = value + 1
+ * 9:12 cmd_high_time. inactive time of DIOW_/DIOR_ during task file
+ * register access.
+ * 13:17 cmd_low_time. active time of DIOW_/DIOR_ during task file
+ * register access.
+ * 18:21 udma_cycle_time. clock freq and clock cycles for UDMA xfer.
+ * during task file register access.
+ * 22:24 pre_high_time. time to initialize 1st cycle for PIO and MW DMA
+ * xfer.
+ * 25:27 cmd_pre_high_time. time to initialize 1st PIO cycle for task
+ * register access.
+ * 28 UDMA enable
+ * 29 DMA enable
+ * 30 PIO_MST enable. if set, the chip is in bus master mode during
+ * PIO.
+ * 31 FIFO enable.
+ */
+
+/* 66MHz DPLL clocks */
+
+static struct hpt_clock hpt3x2n_clocks[] = {
+ { XFER_UDMA_7, 0x1c869c62 },
+ { XFER_UDMA_6, 0x1c869c62 },
+ { XFER_UDMA_5, 0x1c8a9c62 },
+ { XFER_UDMA_4, 0x1c8a9c62 },
+ { XFER_UDMA_3, 0x1c8e9c62 },
+ { XFER_UDMA_2, 0x1c929c62 },
+ { XFER_UDMA_1, 0x1c9a9c62 },
+ { XFER_UDMA_0, 0x1c829c62 },
+
+ { XFER_MW_DMA_2, 0x2c829c62 },
+ { XFER_MW_DMA_1, 0x2c829c66 },
+ { XFER_MW_DMA_0, 0x2c829d2c },
+
+ { XFER_PIO_4, 0x0c829c62 },
+ { XFER_PIO_3, 0x0c829c84 },
+ { XFER_PIO_2, 0x0c829ca6 },
+ { XFER_PIO_1, 0x0d029d26 },
+ { XFER_PIO_0, 0x0d029d5e },
+ { 0, 0x0d029d5e }
+};
+
+/**
+ * hpt3x2n_find_mode - reset the hpt3x2n bus
+ * @ap: ATA port
+ * @speed: transfer mode
+ *
+ * Return the 32bit register programming information for this channel
+ * that matches the speed provided. For the moment the clocks table
+ * is hard coded but easy to change. This will be needed if we use
+ * different DPLLs
+ */
+
+static u32 hpt3x2n_find_mode(struct ata_port *ap, int speed)
+{
+ struct hpt_clock *clocks = hpt3x2n_clocks;
+
+ while(clocks->xfer_speed) {
+ if (clocks->xfer_speed == speed)
+ return clocks->timing;
+ clocks++;
+ }
+ BUG();
+ return 0xffffffffU; /* silence compiler warning */
+}
+
+/**
+ * hpt3x2n_pre_reset - reset the hpt3x2n bus
+ * @ap: ATA port to reset
+ *
+ * Perform the initial reset handling for the 3x2n series controllers.
+ * Reset the hardware and state machine, obtain the cable type.
+ */
+
+static int hpt3xn_pre_reset(struct ata_port *ap)
+{
+ u8 scr2, ata66;
+ struct pci_dev *pdev = to_pci_dev(ap->host->dev);
+
+ pci_read_config_byte(pdev, 0x5B, &scr2);
+ pci_write_config_byte(pdev, 0x5B, scr2 & ~0x01);
+ /* Cable register now active */
+ pci_read_config_byte(pdev, 0x5A, &ata66);
+ /* Restore state */
+ pci_write_config_byte(pdev, 0x5B, scr2);
+
+ if (ata66 & (1 << ap->port_no))
+ ap->cbl = ATA_CBL_PATA40;
+ else
+ ap->cbl = ATA_CBL_PATA80;
+
+ /* Reset the state machine */
+ pci_write_config_byte(pdev, 0x50, 0x37);
+ pci_write_config_byte(pdev, 0x54, 0x37);
+ udelay(100);
+
+ return ata_std_prereset(ap);
+}
+
+/**
+ * hpt3x2n_error_handler - probe the hpt3x2n bus
+ * @ap: ATA port to reset
+ *
+ * Perform the probe reset handling for the 3x2N
+ */
+
+static void hpt3x2n_error_handler(struct ata_port *ap)
+{
+ ata_bmdma_drive_eh(ap, hpt3xn_pre_reset, ata_std_softreset, NULL, ata_std_postreset);
+}
+
+/**
+ * hpt3x2n_set_piomode - PIO setup
+ * @ap: ATA interface
+ * @adev: device on the interface
+ *
+ * Perform PIO mode setup.
+ */
+
+static void hpt3x2n_set_piomode(struct ata_port *ap, struct ata_device *adev)
+{
+ struct pci_dev *pdev = to_pci_dev(ap->host->dev);
+ u32 addr1, addr2;
+ u32 reg;
+ u32 mode;
+ u8 fast;
+
+ addr1 = 0x40 + 4 * (adev->devno + 2 * ap->port_no);
+ addr2 = 0x51 + 4 * ap->port_no;
+
+ /* Fast interrupt prediction disable, hold off interrupt disable */
+ pci_read_config_byte(pdev, addr2, &fast);
+ fast &= ~0x07;
+ pci_write_config_byte(pdev, addr2, fast);
+
+ pci_read_config_dword(pdev, addr1, ®);
+ mode = hpt3x2n_find_mode(ap, adev->pio_mode);
+ mode &= ~0x8000000; /* No FIFO in PIO */
+ mode &= ~0x30070000; /* Leave config bits alone */
+ reg &= 0x30070000; /* Strip timing bits */
+ pci_write_config_dword(pdev, addr1, reg | mode);
+}
+
+/**
+ * hpt3x2n_set_dmamode - DMA timing setup
+ * @ap: ATA interface
+ * @adev: Device being configured
+ *
+ * Set up the channel for MWDMA or UDMA modes. Much the same as with
+ * PIO, load the mode number and then set MWDMA or UDMA flag.
+ */
+
+static void hpt3x2n_set_dmamode(struct ata_port *ap, struct ata_device *adev)
+{
+ struct pci_dev *pdev = to_pci_dev(ap->host->dev);
+ u32 addr1, addr2;
+ u32 reg;
+ u32 mode;
+ u8 fast;
+
+ addr1 = 0x40 + 4 * (adev->devno + 2 * ap->port_no);
+ addr2 = 0x51 + 4 * ap->port_no;
+
+ /* Fast interrupt prediction disable, hold off interrupt disable */
+ pci_read_config_byte(pdev, addr2, &fast);
+ fast &= ~0x07;
+ pci_write_config_byte(pdev, addr2, fast);
+
+ pci_read_config_dword(pdev, addr1, ®);
+ mode = hpt3x2n_find_mode(ap, adev->dma_mode);
+ mode |= 0x8000000; /* FIFO in MWDMA or UDMA */
+ mode &= ~0xC0000000; /* Leave config bits alone */
+ reg &= 0xC0000000; /* Strip timing bits */
+ pci_write_config_dword(pdev, addr1, reg | mode);
+}
+
+/**
+ * hpt3x2n_bmdma_end - DMA engine stop
+ * @qc: ATA command
+ *
+ * Clean up after the HPT3x2n and later DMA engine
+ */
+
+static void hpt3x2n_bmdma_stop(struct ata_queued_cmd *qc)
+{
+ struct ata_port *ap = qc->ap;
+ struct pci_dev *pdev = to_pci_dev(ap->host->dev);
+ int mscreg = 0x50 + 2 * ap->port_no;
+ u8 bwsr_stat, msc_stat;
+
+ pci_read_config_byte(pdev, 0x6A, &bwsr_stat);
+ pci_read_config_byte(pdev, mscreg, &msc_stat);
+ if (bwsr_stat & (1 << ap->port_no))
+ pci_write_config_byte(pdev, mscreg, msc_stat | 0x30);
+ ata_bmdma_stop(qc);
+}
+
+/**
+ * hpt3x2n_set_clock - clock control
+ * @ap: ATA port
+ * @source: 0x21 or 0x23 for PLL or PCI sourced clock
+ *
+ * Switch the ATA bus clock between the PLL and PCI clock sources
+ * while correctly isolating the bus and resetting internal logic
+ *
+ * We must use the DPLL for
+ * - writing
+ * - second channel UDMA7 (SATA ports) or higher
+ * - 66MHz PCI
+ *
+ * or we will underclock the device and get reduced performance.
+ */
+
+static void hpt3x2n_set_clock(struct ata_port *ap, int source)
+{
+ unsigned long bmdma = ap->ioaddr.bmdma_addr;
+
+ /* Tristate the bus */
+ outb(0x80, bmdma+0x73);
+ outb(0x80, bmdma+0x77);
+
+ /* Switch clock and reset channels */
+ outb(source, bmdma+0x7B);
+ outb(0xC0, bmdma+0x79);
+
+ /* Reset state machines */
+ outb(0x37, bmdma+0x70);
+ outb(0x37, bmdma+0x74);
+
+ /* Complete reset */
+ outb(0x00, bmdma+0x79);
+
+ /* Reconnect channels to bus */
+ outb(0x00, bmdma+0x73);
+ outb(0x00, bmdma+0x77);
+}
+
+/* Check if our partner interface is busy */
+
+static int hpt3x2n_pair_idle(struct ata_port *ap)
+{
+ struct ata_host *host = ap->host;
+ struct ata_port *pair = host->ports[ap->port_no ^ 1];
+
+ if (pair->hsm_task_state == HSM_ST_IDLE)
+ return 1;
+ return 0;
+}
+
+static int hpt3x2n_use_dpll(struct ata_port *ap, int writing)
+{
+ long flags = (long)ap->host->private_data;
+ /* See if we should use the DPLL */
+ if (writing)
+ return USE_DPLL; /* Needed for write */
+ if (flags & PCI66)
+ return USE_DPLL; /* Needed at 66Mhz */
+ return 0;
+}
+
+static unsigned int hpt3x2n_qc_issue_prot(struct ata_queued_cmd *qc)
+{
+ struct ata_taskfile *tf = &qc->tf;
+ struct ata_port *ap = qc->ap;
+ int flags = (long)ap->host->private_data;
+
+ if (hpt3x2n_pair_idle(ap)) {
+ int dpll = hpt3x2n_use_dpll(ap, (tf->flags & ATA_TFLAG_WRITE));
+ if ((flags & USE_DPLL) != dpll) {
+ if (dpll == 1)
+ hpt3x2n_set_clock(ap, 0x21);
+ else
+ hpt3x2n_set_clock(ap, 0x23);
+ }
+ }
+ return ata_qc_issue_prot(qc);
+}
+
+static struct scsi_host_template hpt3x2n_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,
+ .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,
+ .slave_destroy = ata_scsi_slave_destroy,
+ .bios_param = ata_std_bios_param,
+};
+
+/*
+ * Configuration for HPT3x2n.
+ */
+
+static struct ata_port_operations hpt3x2n_port_ops = {
+ .port_disable = ata_port_disable,
+ .set_piomode = hpt3x2n_set_piomode,
+ .set_dmamode = hpt3x2n_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,
+
+ .freeze = ata_bmdma_freeze,
+ .thaw = ata_bmdma_thaw,
+ .error_handler = hpt3x2n_error_handler,
+ .post_internal_cmd = ata_bmdma_post_internal_cmd,
+
+ .bmdma_setup = ata_bmdma_setup,
+ .bmdma_start = ata_bmdma_start,
+ .bmdma_stop = hpt3x2n_bmdma_stop,
+ .bmdma_status = ata_bmdma_status,
+
+ .qc_prep = ata_qc_prep,
+ .qc_issue = hpt3x2n_qc_issue_prot,
+
+ .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
+};
+
+/**
+ * hpt3xn_calibrate_dpll - Calibrate the DPLL loop
+ * @dev: PCI device
+ *
+ * Perform a calibration cycle on the HPT3xN DPLL. Returns 1 if this
+ * succeeds
+ */
+
+static int hpt3xn_calibrate_dpll(struct pci_dev *dev)
+{
+ u8 reg5b;
+ u32 reg5c;
+ int tries;
+
+ for(tries = 0; tries < 0x5000; tries++) {
+ udelay(50);
+ pci_read_config_byte(dev, 0x5b, ®5b);
+ if (reg5b & 0x80) {
+ /* See if it stays set */
+ for(tries = 0; tries < 0x1000; tries ++) {
+ pci_read_config_byte(dev, 0x5b, ®5b);
+ /* Failed ? */
+ if ((reg5b & 0x80) == 0)
+ return 0;
+ }
+ /* Turn off tuning, we have the DPLL set */
+ pci_read_config_dword(dev, 0x5c, ®5c);
+ pci_write_config_dword(dev, 0x5c, reg5c & ~ 0x100);
+ return 1;
+ }
+ }
+ /* Never went stable */
+ return 0;
+}
+
+static int hpt3x2n_pci_clock(struct pci_dev *pdev)
+{
+ unsigned long freq;
+ u32 fcnt;
+
+ pci_read_config_dword(pdev, 0x70/*CHECKME*/, &fcnt);
+ if ((fcnt >> 12) != 0xABCDE) {
+ printk(KERN_WARNING "hpt3xn: BIOS clock data not set.\n");
+ return 33; /* Not BIOS set */
+ }
+ fcnt &= 0x1FF;
+
+ freq = (fcnt * 77) / 192;
+
+ /* Clamp to bands */
+ if (freq < 40)
+ return 33;
+ if (freq < 45)
+ return 40;
+ if (freq < 55)
+ return 50;
+ return 66;
+}
+
+/**
+ * hpt3x2n_init_one - Initialise an HPT37X/302
+ * @dev: PCI device
+ * @id: Entry in match table
+ *
+ * Initialise an HPT3x2n device. There are some interesting complications
+ * here. Firstly the chip may report 366 and be one of several variants.
+ * Secondly all the timings depend on the clock for the chip which we must
+ * detect and look up
+ *
+ * This is the known chip mappings. It may be missing a couple of later
+ * releases.
+ *
+ * Chip version PCI Rev Notes
+ * HPT372 4 (HPT366) 5 Other driver
+ * HPT372N 4 (HPT366) 6 UDMA133
+ * HPT372 5 (HPT372) 1 Other driver
+ * HPT372N 5 (HPT372) 2 UDMA133
+ * HPT302 6 (HPT302) * Other driver
+ * HPT302N 6 (HPT302) > 1 UDMA133
+ * HPT371 7 (HPT371) * Other driver
+ * HPT371N 7 (HPT371) > 1 UDMA133
+ * HPT374 8 (HPT374) * Other driver
+ * HPT372N 9 (HPT372N) * UDMA133
+ *
+ * (1) UDMA133 support depends on the bus clock
+ *
+ * To pin down HPT371N
+ */
+
+static int hpt3x2n_init_one(struct pci_dev *dev, const struct pci_device_id *id)
+{
+ /* HPT372N and friends - UDMA133 */
+ static struct ata_port_info info = {
+ .sht = &hpt3x2n_sht,
+ .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
+ .pio_mask = 0x1f,
+ .mwdma_mask = 0x07,
+ .udma_mask = 0x7f,
+ .port_ops = &hpt3x2n_port_ops
+ };
+ struct ata_port_info *port_info[2];
+ struct ata_port_info *port = &info;
+
+ u8 irqmask;
+ u32 class_rev;
+
+ unsigned int pci_mhz;
+ unsigned int f_low, f_high;
+ int adjust;
+
+ pci_read_config_dword(dev, PCI_CLASS_REVISION, &class_rev);
+ class_rev &= 0xFF;
+
+ switch(dev->device) {
+ case PCI_DEVICE_ID_TTI_HPT366:
+ if (class_rev < 6)
+ return -ENODEV;
+ break;
+ case PCI_DEVICE_ID_TTI_HPT372:
+ /* 372N if rev >= 1*/
+ if (class_rev == 0)
+ return -ENODEV;
+ break;
+ case PCI_DEVICE_ID_TTI_HPT302:
+ if (class_rev < 2)
+ return -ENODEV;
+ break;
+ case PCI_DEVICE_ID_TTI_HPT372N:
+ break;
+ default:
+ printk(KERN_ERR "pata_hpt3x2n: PCI table is bogus please report (%d).\n", dev->device);
+ return -ENODEV;
+ }
+
+ /* Ok so this is a chip we support */
+
+ pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, (L1_CACHE_BYTES / 4));
+ pci_write_config_byte(dev, PCI_LATENCY_TIMER, 0x78);
+ pci_write_config_byte(dev, PCI_MIN_GNT, 0x08);
+ pci_write_config_byte(dev, PCI_MAX_LAT, 0x08);
+
+ pci_read_config_byte(dev, 0x5A, &irqmask);
+ irqmask &= ~0x10;
+ pci_write_config_byte(dev, 0x5a, irqmask);
+
+ /* Tune the PLL. HPT recommend using 75 for SATA, 66 for UDMA133 or
+ 50 for UDMA100. Right now we always use 66 */
+
+ pci_mhz = hpt3x2n_pci_clock(dev);
+
+ f_low = (pci_mhz * 48) / 66; /* PCI Mhz for 66Mhz DPLL */
+ f_high = f_low + 2; /* Tolerance */
+
+ pci_write_config_dword(dev, 0x5C, (f_high << 16) | f_low | 0x100);
+ /* PLL clock */
+ pci_write_config_byte(dev, 0x5B, 0x21);
+
+ /* Unlike the 37x we don't try jiggling the frequency */
+ for(adjust = 0; adjust < 8; adjust++) {
+ if (hpt3xn_calibrate_dpll(dev))
+ break;
+ pci_write_config_dword(dev, 0x5C, (f_high << 16) | f_low);
+ }
+ if (adjust == 8)
+ printk(KERN_WARNING "hpt3xn: DPLL did not stabilize.\n");
+
+ /* Set our private data up. We only need a few flags so we use
+ it directly */
+ port->private_data = NULL;
+ if (pci_mhz > 60)
+ port->private_data = (void *)PCI66;
+
+ /* Now kick off ATA set up */
+ port_info[0] = port_info[1] = port;
+ return ata_pci_init_one(dev, port_info, 2);
+}
+
+static const struct pci_device_id hpt3x2n[] = {
+ { PCI_VDEVICE(TTI, PCI_DEVICE_ID_TTI_HPT366), },
+ { PCI_VDEVICE(TTI, PCI_DEVICE_ID_TTI_HPT372), },
+ { PCI_VDEVICE(TTI, PCI_DEVICE_ID_TTI_HPT302), },
+ { PCI_VDEVICE(TTI, PCI_DEVICE_ID_TTI_HPT372N), },
+
+ { },
+};
+
+static struct pci_driver hpt3x2n_pci_driver = {
+ .name = DRV_NAME,
+ .id_table = hpt3x2n,
+ .probe = hpt3x2n_init_one,
+ .remove = ata_pci_remove_one
+};
+
+static int __init hpt3x2n_init(void)
+{
+ return pci_register_driver(&hpt3x2n_pci_driver);
+}
+
+static void __exit hpt3x2n_exit(void)
+{
+ pci_unregister_driver(&hpt3x2n_pci_driver);
+}
+
+MODULE_AUTHOR("Alan Cox");
+MODULE_DESCRIPTION("low-level driver for the Highpoint HPT3x2n/30x");
+MODULE_LICENSE("GPL");
+MODULE_DEVICE_TABLE(pci, hpt3x2n);
+MODULE_VERSION(DRV_VERSION);
+
+module_init(hpt3x2n_init);
+module_exit(hpt3x2n_exit);
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