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272 lines
6.5 KiB
272 lines
6.5 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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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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* |
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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/blkdev.h> |
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#include <linux/delay.h> |
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#include <linux/gfp.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 "0.0.5" |
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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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* @ap: ATA port |
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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. Reloading the setup time is expensive so we |
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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 - 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(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_sff_qc_issue(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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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 0; |
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} |
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static bool cmd640_sff_irq_check(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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int irq_reg = ap->port_no ? ARTIM23 : CFR; |
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u8 irq_stat, irq_mask = ap->port_no ? 0x10 : 0x04; |
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pci_read_config_byte(pdev, irq_reg, &irq_stat); |
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return irq_stat & irq_mask; |
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} |
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static struct scsi_host_template cmd640_sht = { |
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ATA_PIO_SHT(DRV_NAME), |
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}; |
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static struct ata_port_operations cmd640_port_ops = { |
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.inherits = &ata_sff_port_ops, |
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/* In theory xfer_noirq is not needed once we kill the prefetcher */ |
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.sff_data_xfer = ata_sff_data_xfer32, |
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.sff_irq_check = cmd640_sff_irq_check, |
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.qc_issue = cmd640_qc_issue, |
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.cable_detect = ata_cable_40wire, |
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.set_piomode = cmd640_set_piomode, |
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.port_start = cmd640_port_start, |
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}; |
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static void cmd640_hardware_init(struct pci_dev *pdev) |
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{ |
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u8 ctrl; |
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/* CMD640 detected, commiserations */ |
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pci_write_config_byte(pdev, 0x5B, 0x00); |
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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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} |
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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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static const struct ata_port_info info = { |
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.flags = ATA_FLAG_SLAVE_POSS, |
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.pio_mask = ATA_PIO4, |
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.port_ops = &cmd640_port_ops |
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}; |
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const struct ata_port_info *ppi[] = { &info, NULL }; |
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int rc; |
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rc = pcim_enable_device(pdev); |
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if (rc) |
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return rc; |
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cmd640_hardware_init(pdev); |
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return ata_pci_sff_init_one(pdev, ppi, &cmd640_sht, NULL, 0); |
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} |
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#ifdef CONFIG_PM_SLEEP |
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static int cmd640_reinit_one(struct pci_dev *pdev) |
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{ |
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struct ata_host *host = pci_get_drvdata(pdev); |
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int rc; |
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rc = ata_pci_device_do_resume(pdev); |
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if (rc) |
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return rc; |
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cmd640_hardware_init(pdev); |
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ata_host_resume(host); |
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return 0; |
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} |
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#endif |
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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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#ifdef CONFIG_PM_SLEEP |
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.suspend = ata_pci_device_suspend, |
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.resume = cmd640_reinit_one, |
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#endif |
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}; |
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module_pci_driver(cmd640_pci_driver); |
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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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