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pata_cmd640: CMD640 PCI support
Support for the PCI CMD640 (not VLB) Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Alan Cox
Jeff Garzik
parent
be0d18dff5
commit
b2248dac07
@ -209,6 +209,16 @@ config PATA_ATIIXP
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If unsure, say N.
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config PATA_CMD640_PCI
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tristate "CMD640 PCI PATA support (Very Experimental)"
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depends on PCI && EXPERIMENTAL
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help
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This option enables support for the CMD640 PCI IDE
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interface chip. Only the primary channel is currently
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supported.
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If unsure, say N.
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config PATA_CMD64X
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tristate "CMD64x PATA support (Very Experimental)"
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depends on PCI&& EXPERIMENTAL
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@ -22,6 +22,7 @@ obj-$(CONFIG_PATA_ALI) += pata_ali.o
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obj-$(CONFIG_PATA_AMD) += pata_amd.o
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obj-$(CONFIG_PATA_ARTOP) += pata_artop.o
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obj-$(CONFIG_PATA_ATIIXP) += pata_atiixp.o
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obj-$(CONFIG_PATA_CMD640_PCI) += pata_cmd640.o
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obj-$(CONFIG_PATA_CMD64X) += pata_cmd64x.o
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obj-$(CONFIG_PATA_CS5520) += pata_cs5520.o
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obj-$(CONFIG_PATA_CS5530) += pata_cs5530.o
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298
drivers/ata/pata_cmd640.c
Normal file
298
drivers/ata/pata_cmd640.c
Normal file
@ -0,0 +1,298 @@
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/*
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* pata_cmd640.c - CMD640 PCI PATA for new ATA layer
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* (C) 2007 Red Hat Inc
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* Alan Cox <alan@redhat.com>
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*
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* Based upon
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* linux/drivers/ide/pci/cmd640.c Version 1.02 Sep 01, 1996
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*
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* Copyright (C) 1995-1996 Linus Torvalds & authors (see driver)
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*
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* This drives only the PCI version of the controller. If you have a
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* VLB one then we have enough docs to support it but you can write
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* your own code.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/pci.h>
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#include <linux/init.h>
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#include <linux/blkdev.h>
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#include <linux/delay.h>
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#include <scsi/scsi_host.h>
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#include <linux/libata.h>
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#define DRV_NAME "pata_cmd640"
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#define DRV_VERSION "0.0.3"
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struct cmd640_reg {
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int last;
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u8 reg58[ATA_MAX_DEVICES];
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};
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enum {
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CFR = 0x50,
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CNTRL = 0x51,
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CMDTIM = 0x52,
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ARTIM0 = 0x53,
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DRWTIM0 = 0x54,
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ARTIM23 = 0x57,
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DRWTIM23 = 0x58,
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BRST = 0x59
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};
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/**
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* cmd640_set_piomode - set initial PIO mode data
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* @adev: ATA device
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*
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* Called to do the PIO mode setup.
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*/
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static void cmd640_set_piomode(struct ata_port *ap, struct ata_device *adev)
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{
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struct cmd640_reg *timing = ap->private_data;
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struct pci_dev *pdev = to_pci_dev(ap->host->dev);
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struct ata_timing t;
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const unsigned long T = 1000000 / 33;
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const u8 setup_data[] = { 0x40, 0x40, 0x40, 0x80, 0x00 };
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u8 reg;
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int arttim = ARTIM0 + 2 * adev->devno;
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struct ata_device *pair = ata_dev_pair(adev);
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if (ata_timing_compute(adev, adev->pio_mode, &t, T, 0) < 0) {
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printk(KERN_ERR DRV_NAME ": mode computation failed.\n");
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return;
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}
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/* The second channel has shared timings and the setup timing is
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messy to switch to merge it for worst case */
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if (ap->port_no && pair) {
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struct ata_timing p;
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ata_timing_compute(pair, pair->pio_mode, &p, T, 1);
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ata_timing_merge(&p, &t, &t, ATA_TIMING_SETUP);
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}
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/* Make the timings fit */
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if (t.recover > 16) {
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t.active += t.recover - 16;
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t.recover = 16;
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}
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if (t.active > 16)
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t.active = 16;
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/* Now convert the clocks into values we can actually stuff into
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the chip */
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if (t.recover > 1)
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t.recover--; /* 640B only */
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else
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t.recover = 15;
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if (t.setup > 4)
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t.setup = 0xC0;
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else
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t.setup = setup_data[t.setup];
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if (ap->port_no == 0) {
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t.active &= 0x0F; /* 0 = 16 */
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/* Load setup timing */
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pci_read_config_byte(pdev, arttim, ®);
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reg &= 0x3F;
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reg |= t.setup;
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pci_write_config_byte(pdev, arttim, reg);
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/* Load active/recovery */
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pci_write_config_byte(pdev, arttim + 1, (t.active << 4) | t.recover);
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} else {
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/* Save the shared timings for channel, they will be loaded
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by qc_issue_prot. Reloading the setup time is expensive
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so we keep a merged one loaded */
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pci_read_config_byte(pdev, ARTIM23, ®);
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reg &= 0x3F;
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reg |= t.setup;
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pci_write_config_byte(pdev, ARTIM23, reg);
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timing->reg58[adev->devno] = (t.active << 4) | t.recover;
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}
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}
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/**
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* cmd640_qc_issue_prot - command preparation hook
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* @qc: Command to be issued
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*
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* Channel 1 has shared timings. We must reprogram the
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* clock each drive 2/3 switch we do.
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*/
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static unsigned int cmd640_qc_issue_prot(struct ata_queued_cmd *qc)
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{
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struct ata_port *ap = qc->ap;
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struct ata_device *adev = qc->dev;
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struct pci_dev *pdev = to_pci_dev(ap->host->dev);
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struct cmd640_reg *timing = ap->private_data;
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if (ap->port_no != 0 && adev->devno != timing->last) {
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pci_write_config_byte(pdev, DRWTIM23, timing->reg58[adev->devno]);
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timing->last = adev->devno;
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}
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return ata_qc_issue_prot(qc);
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}
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/**
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* cmd640_port_start - port setup
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* @ap: ATA port being set up
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*
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* The CMD640 needs to maintain private data structures so we
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* allocate space here.
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*/
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static int cmd640_port_start(struct ata_port *ap)
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{
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struct pci_dev *pdev = to_pci_dev(ap->host->dev);
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struct cmd640_reg *timing;
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int ret = ata_port_start(ap);
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if (ret < 0)
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return ret;
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timing = devm_kzalloc(&pdev->dev, sizeof(struct cmd640_reg), GFP_KERNEL);
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if (timing == NULL)
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return -ENOMEM;
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timing->last = -1; /* Force a load */
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ap->private_data = timing;
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return ret;
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}
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static struct scsi_host_template cmd640_sht = {
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.module = THIS_MODULE,
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.name = DRV_NAME,
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.ioctl = ata_scsi_ioctl,
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.queuecommand = ata_scsi_queuecmd,
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.can_queue = ATA_DEF_QUEUE,
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.this_id = ATA_SHT_THIS_ID,
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.sg_tablesize = LIBATA_MAX_PRD,
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.cmd_per_lun = ATA_SHT_CMD_PER_LUN,
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.emulated = ATA_SHT_EMULATED,
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.use_clustering = ATA_SHT_USE_CLUSTERING,
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.proc_name = DRV_NAME,
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.dma_boundary = ATA_DMA_BOUNDARY,
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.slave_configure = ata_scsi_slave_config,
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.slave_destroy = ata_scsi_slave_destroy,
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.bios_param = ata_std_bios_param,
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.resume = ata_scsi_device_resume,
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.suspend = ata_scsi_device_suspend,
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};
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static struct ata_port_operations cmd640_port_ops = {
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.port_disable = ata_port_disable,
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.set_piomode = cmd640_set_piomode,
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.mode_filter = ata_pci_default_filter,
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.tf_load = ata_tf_load,
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.tf_read = ata_tf_read,
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.check_status = ata_check_status,
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.exec_command = ata_exec_command,
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.dev_select = ata_std_dev_select,
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.freeze = ata_bmdma_freeze,
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.thaw = ata_bmdma_thaw,
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.error_handler = ata_bmdma_error_handler,
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.post_internal_cmd = ata_bmdma_post_internal_cmd,
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.cable_detect = ata_cable_40wire,
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.bmdma_setup = ata_bmdma_setup,
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.bmdma_start = ata_bmdma_start,
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.bmdma_stop = ata_bmdma_stop,
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.bmdma_status = ata_bmdma_status,
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.qc_prep = ata_qc_prep,
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.qc_issue = cmd640_qc_issue_prot,
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/* In theory this is not needed once we kill the prefetcher */
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.data_xfer = ata_data_xfer_noirq,
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.irq_handler = ata_interrupt,
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.irq_clear = ata_bmdma_irq_clear,
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.irq_on = ata_irq_on,
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.irq_ack = ata_irq_ack,
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.port_start = cmd640_port_start,
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};
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static int cmd640_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
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{
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u8 r;
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u8 ctrl;
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static struct ata_port_info info = {
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.sht = &cmd640_sht,
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.flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
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.pio_mask = 0x1f,
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.port_ops = &cmd640_port_ops
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};
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static struct ata_port_info *port_info[2] = { &info, &info };
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/* CMD640 detected, commiserations */
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pci_write_config_byte(pdev, 0x5C, 0x00);
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/* Get version info */
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pci_read_config_byte(pdev, CFR, &r);
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/* PIO0 command cycles */
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pci_write_config_byte(pdev, CMDTIM, 0);
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/* 512 byte bursts (sector) */
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pci_write_config_byte(pdev, BRST, 0x40);
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/*
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* A reporter a long time ago
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* Had problems with the data fifo
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* So don't run the risk
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* Of putting crap on the disk
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* For its better just to go slow
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*/
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/* Do channel 0 */
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pci_read_config_byte(pdev, CNTRL, &ctrl);
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pci_write_config_byte(pdev, CNTRL, ctrl | 0xC0);
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/* Ditto for channel 1 */
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pci_read_config_byte(pdev, ARTIM23, &ctrl);
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ctrl |= 0x0C;
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pci_write_config_byte(pdev, ARTIM23, ctrl);
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return ata_pci_init_one(pdev, port_info, 2);
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}
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static int cmd640_reinit_one(struct pci_dev *pdev)
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{
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return ata_pci_device_resume(pdev);
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}
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static const struct pci_device_id cmd640[] = {
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{ PCI_VDEVICE(CMD, 0x640), 0 },
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{ },
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};
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static struct pci_driver cmd640_pci_driver = {
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.name = DRV_NAME,
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.id_table = cmd640,
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.probe = cmd640_init_one,
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.remove = ata_pci_remove_one,
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.suspend = ata_pci_device_suspend,
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.resume = cmd640_reinit_one,
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};
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static int __init cmd640_init(void)
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{
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return pci_register_driver(&cmd640_pci_driver);
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}
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static void __exit cmd640_exit(void)
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{
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pci_unregister_driver(&cmd640_pci_driver);
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}
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MODULE_AUTHOR("Alan Cox");
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MODULE_DESCRIPTION("low-level driver for CMD640 PATA controllers");
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MODULE_LICENSE("GPL");
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MODULE_DEVICE_TABLE(pci, cmd640);
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MODULE_VERSION(DRV_VERSION);
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module_init(cmd640_init);
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module_exit(cmd640_exit);
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