--- /dev/null
+/*
+ * pata_cmd640.c - CMD640 PCI PATA for new ATA layer
+ * (C) 2007 Red Hat Inc
+ * Alan Cox <alan@redhat.com>
+ *
+ * Based upon
+ * linux/drivers/ide/pci/cmd640.c Version 1.02 Sep 01, 1996
+ *
+ * Copyright (C) 1995-1996 Linus Torvalds & authors (see driver)
+ *
+ * This drives only the PCI version of the controller. If you have a
+ * VLB one then we have enough docs to support it but you can write
+ * your own code.
+ */
+
+#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_cmd640"
+#define DRV_VERSION "0.0.3"
+
+struct cmd640_reg {
+ int last;
+ u8 reg58[ATA_MAX_DEVICES];
+};
+
+enum {
+ CFR = 0x50,
+ CNTRL = 0x51,
+ CMDTIM = 0x52,
+ ARTIM0 = 0x53,
+ DRWTIM0 = 0x54,
+ ARTIM23 = 0x57,
+ DRWTIM23 = 0x58,
+ BRST = 0x59
+};
+
+/**
+ * cmd640_set_piomode - set initial PIO mode data
+ * @adev: ATA device
+ *
+ * Called to do the PIO mode setup.
+ */
+
+static void cmd640_set_piomode(struct ata_port *ap, struct ata_device *adev)
+{
+ struct cmd640_reg *timing = ap->private_data;
+ struct pci_dev *pdev = to_pci_dev(ap->host->dev);
+ struct ata_timing t;
+ const unsigned long T = 1000000 / 33;
+ const u8 setup_data[] = { 0x40, 0x40, 0x40, 0x80, 0x00 };
+ u8 reg;
+ int arttim = ARTIM0 + 2 * adev->devno;
+ struct ata_device *pair = ata_dev_pair(adev);
+
+ if (ata_timing_compute(adev, adev->pio_mode, &t, T, 0) < 0) {
+ printk(KERN_ERR DRV_NAME ": mode computation failed.\n");
+ return;
+ }
+
+ /* The second channel has shared timings and the setup timing is
+ messy to switch to merge it for worst case */
+ if (ap->port_no && pair) {
+ struct ata_timing p;
+ ata_timing_compute(pair, pair->pio_mode, &p, T, 1);
+ ata_timing_merge(&p, &t, &t, ATA_TIMING_SETUP);
+ }
+
+ /* Make the timings fit */
+ if (t.recover > 16) {
+ t.active += t.recover - 16;
+ t.recover = 16;
+ }
+ if (t.active > 16)
+ t.active = 16;
+
+ /* Now convert the clocks into values we can actually stuff into
+ the chip */
+
+ if (t.recover > 1)
+ t.recover--; /* 640B only */
+ else
+ t.recover = 15;
+
+ if (t.setup > 4)
+ t.setup = 0xC0;
+ else
+ t.setup = setup_data[t.setup];
+
+ if (ap->port_no == 0) {
+ t.active &= 0x0F; /* 0 = 16 */
+
+ /* Load setup timing */
+ pci_read_config_byte(pdev, arttim, ®);
+ reg &= 0x3F;
+ reg |= t.setup;
+ pci_write_config_byte(pdev, arttim, reg);
+
+ /* Load active/recovery */
+ pci_write_config_byte(pdev, arttim + 1, (t.active << 4) | t.recover);
+ } else {
+ /* Save the shared timings for channel, they will be loaded
+ by qc_issue_prot. Reloading the setup time is expensive
+ so we keep a merged one loaded */
+ pci_read_config_byte(pdev, ARTIM23, ®);
+ reg &= 0x3F;
+ reg |= t.setup;
+ pci_write_config_byte(pdev, ARTIM23, reg);
+ timing->reg58[adev->devno] = (t.active << 4) | t.recover;
+ }
+}
+
+
+/**
+ * cmd640_qc_issue_prot - command preparation hook
+ * @qc: Command to be issued
+ *
+ * Channel 1 has shared timings. We must reprogram the
+ * clock each drive 2/3 switch we do.
+ */
+
+static unsigned int cmd640_qc_issue_prot(struct ata_queued_cmd *qc)
+{
+ struct ata_port *ap = qc->ap;
+ struct ata_device *adev = qc->dev;
+ struct pci_dev *pdev = to_pci_dev(ap->host->dev);
+ struct cmd640_reg *timing = ap->private_data;
+
+ if (ap->port_no != 0 && adev->devno != timing->last) {
+ pci_write_config_byte(pdev, DRWTIM23, timing->reg58[adev->devno]);
+ timing->last = adev->devno;
+ }
+ return ata_qc_issue_prot(qc);
+}
+
+/**
+ * cmd640_port_start - port setup
+ * @ap: ATA port being set up
+ *
+ * The CMD640 needs to maintain private data structures so we
+ * allocate space here.
+ */
+
+static int cmd640_port_start(struct ata_port *ap)
+{
+ struct pci_dev *pdev = to_pci_dev(ap->host->dev);
+ struct cmd640_reg *timing;
+
+ int ret = ata_port_start(ap);
+ if (ret < 0)
+ return ret;
+
+ timing = devm_kzalloc(&pdev->dev, sizeof(struct cmd640_reg), GFP_KERNEL);
+ if (timing == NULL)
+ return -ENOMEM;
+ timing->last = -1; /* Force a load */
+ ap->private_data = timing;
+ return ret;
+}
+
+static struct scsi_host_template cmd640_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,
+ .resume = ata_scsi_device_resume,
+ .suspend = ata_scsi_device_suspend,
+};
+
+static struct ata_port_operations cmd640_port_ops = {
+ .port_disable = ata_port_disable,
+ .set_piomode = cmd640_set_piomode,
+ .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 = ata_bmdma_error_handler,
+ .post_internal_cmd = ata_bmdma_post_internal_cmd,
+ .cable_detect = ata_cable_40wire,
+
+ .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 = cmd640_qc_issue_prot,
+
+ /* In theory this is not needed once we kill the prefetcher */
+ .data_xfer = ata_data_xfer_noirq,
+
+ .irq_handler = ata_interrupt,
+ .irq_clear = ata_bmdma_irq_clear,
+ .irq_on = ata_irq_on,
+ .irq_ack = ata_irq_ack,
+
+ .port_start = cmd640_port_start,
+};
+
+static int cmd640_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
+{
+ u8 r;
+ u8 ctrl;
+
+ static struct ata_port_info info = {
+ .sht = &cmd640_sht,
+ .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
+ .pio_mask = 0x1f,
+ .port_ops = &cmd640_port_ops
+ };
+
+ static struct ata_port_info *port_info[2] = { &info, &info };
+
+ /* CMD640 detected, commiserations */
+ pci_write_config_byte(pdev, 0x5C, 0x00);
+ /* Get version info */
+ pci_read_config_byte(pdev, CFR, &r);
+ /* PIO0 command cycles */
+ pci_write_config_byte(pdev, CMDTIM, 0);
+ /* 512 byte bursts (sector) */
+ pci_write_config_byte(pdev, BRST, 0x40);
+ /*
+ * A reporter a long time ago
+ * Had problems with the data fifo
+ * So don't run the risk
+ * Of putting crap on the disk
+ * For its better just to go slow
+ */
+ /* Do channel 0 */
+ pci_read_config_byte(pdev, CNTRL, &ctrl);
+ pci_write_config_byte(pdev, CNTRL, ctrl | 0xC0);
+ /* Ditto for channel 1 */
+ pci_read_config_byte(pdev, ARTIM23, &ctrl);
+ ctrl |= 0x0C;
+ pci_write_config_byte(pdev, ARTIM23, ctrl);
+
+ return ata_pci_init_one(pdev, port_info, 2);
+}
+
+static int cmd640_reinit_one(struct pci_dev *pdev)
+{
+ return ata_pci_device_resume(pdev);
+}
+
+static const struct pci_device_id cmd640[] = {
+ { PCI_VDEVICE(CMD, 0x640), 0 },
+ { },
+};
+
+static struct pci_driver cmd640_pci_driver = {
+ .name = DRV_NAME,
+ .id_table = cmd640,
+ .probe = cmd640_init_one,
+ .remove = ata_pci_remove_one,
+ .suspend = ata_pci_device_suspend,
+ .resume = cmd640_reinit_one,
+};
+
+static int __init cmd640_init(void)
+{
+ return pci_register_driver(&cmd640_pci_driver);
+}
+
+static void __exit cmd640_exit(void)
+{
+ pci_unregister_driver(&cmd640_pci_driver);
+}
+
+MODULE_AUTHOR("Alan Cox");
+MODULE_DESCRIPTION("low-level driver for CMD640 PATA controllers");
+MODULE_LICENSE("GPL");
+MODULE_DEVICE_TABLE(pci, cmd640);
+MODULE_VERSION(DRV_VERSION);
+
+module_init(cmd640_init);
+module_exit(cmd640_exit);
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