pata_cmd640: CMD640 PCI support
authorAlan Cox <alan@lxorguk.ukuu.org.uk>
Tue, 6 Mar 2007 10:38:11 +0000 (02:38 -0800)
committerJeff Garzik <jeff@garzik.org>
Sat, 28 Apr 2007 18:15:55 +0000 (14:15 -0400)
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>
drivers/ata/Kconfig
drivers/ata/Makefile
drivers/ata/pata_cmd640.c [new file with mode: 0644]

index 7bdbe5a..1410907 100644 (file)
@@ -209,6 +209,16 @@ config PATA_ATIIXP
 
          If unsure, say N.
 
+config PATA_CMD640_PCI
+       tristate "CMD640 PCI PATA support (Very Experimental)"
+       depends on PCI && EXPERIMENTAL
+       help
+         This option enables support for the CMD640 PCI IDE
+         interface chip. Only the primary channel is currently
+         supported.
+
+         If unsure, say N.
+
 config PATA_CMD64X
        tristate "CMD64x PATA support (Very Experimental)"
        depends on PCI&& EXPERIMENTAL
index 13d7397..b7055e3 100644 (file)
@@ -22,6 +22,7 @@ obj-$(CONFIG_PATA_ALI)                += pata_ali.o
 obj-$(CONFIG_PATA_AMD)         += pata_amd.o
 obj-$(CONFIG_PATA_ARTOP)       += pata_artop.o
 obj-$(CONFIG_PATA_ATIIXP)      += pata_atiixp.o
+obj-$(CONFIG_PATA_CMD640_PCI)  += pata_cmd640.o
 obj-$(CONFIG_PATA_CMD64X)      += pata_cmd64x.o
 obj-$(CONFIG_PATA_CS5520)      += pata_cs5520.o
 obj-$(CONFIG_PATA_CS5530)      += pata_cs5530.o
diff --git a/drivers/ata/pata_cmd640.c b/drivers/ata/pata_cmd640.c
new file mode 100644 (file)
index 0000000..4d01d46
--- /dev/null
@@ -0,0 +1,298 @@
+/*
+ * 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);
+               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);
+               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);