drivers/ata/pata_sc1200.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * New ATA layer SC1200 driver      Alan Cox <alan@lxorguk.ukuu.org.uk>
0004  *
0005  * TODO: Mode selection filtering
0006  * TODO: Needs custom DMA cleanup code
0007  *
0008  * Based very heavily on
0009  *
0010  * linux/drivers/ide/pci/sc1200.c       Version 0.91    28-Jan-2003
0011  *
0012  * Copyright (C) 2000-2002      Mark Lord <mlord@pobox.com>
0013  * May be copied or modified under the terms of the GNU General Public License
0014  *
0015  * Development of this chipset driver was funded
0016  * by the nice folks at National Semiconductor.
0017  */
0018
0019 #include <linux/kernel.h>
0020 #include <linux/module.h>
0021 #include <linux/pci.h>
0022 #include <linux/blkdev.h>
0023 #include <linux/delay.h>
0024 #include <scsi/scsi_host.h>
0025 #include <linux/libata.h>
0026
0027 #define DRV_NAME    "pata_sc1200"
0028 #define DRV_VERSION "0.2.6"
0029
0030 #define SC1200_REV_A    0x00
0031 #define SC1200_REV_B1   0x01
0032 #define SC1200_REV_B3   0x02
0033 #define SC1200_REV_C1   0x03
0034 #define SC1200_REV_D1   0x04
0035
0036 /**
0037  *  sc1200_clock    -   PCI clock
0038  *
0039  *  Return the PCI bus clocking for the SC1200 chipset configuration
0040  *  in use. We return 0 for 33MHz 1 for 48MHz and 2 for 66Mhz
0041  */
0042
0043 static int sc1200_clock(void)
0044 {
0045     /* Magic registers that give us the chipset data */
0046     u8 chip_id = inb(0x903C);
0047     u8 silicon_rev = inb(0x903D);
0048     u16 pci_clock;
0049
0050     if (chip_id == 0x04 && silicon_rev < SC1200_REV_B1)
0051         return 0;   /* 33 MHz mode */
0052
0053     /* Clock generator configuration 0x901E its 8/9 are the PCI clocking
0054        0/3 is 33Mhz 1 is 48 2 is 66 */
0055
0056     pci_clock = inw(0x901E);
0057     pci_clock >>= 8;
0058     pci_clock &= 0x03;
0059     if (pci_clock == 3)
0060         pci_clock = 0;
0061     return pci_clock;
0062 }
0063
0064 /**
0065  *  sc1200_set_piomode      -   PIO setup
0066  *  @ap: ATA interface
0067  *  @adev: device on the interface
0068  *
0069  *  Set our PIO requirements. This is fairly simple on the SC1200
0070  */
0071
0072 static void sc1200_set_piomode(struct ata_port *ap, struct ata_device *adev)
0073 {
0074     static const u32 pio_timings[4][5] = {
0075         /* format0, 33Mhz */
0076         { 0x00009172, 0x00012171, 0x00020080, 0x00032010, 0x00040010 },
0077         /* format1, 33Mhz */
0078         { 0xd1329172, 0x71212171, 0x30200080, 0x20102010, 0x00100010 },
0079         /* format1, 48Mhz */
0080         { 0xfaa3f4f3, 0xc23232b2, 0x513101c1, 0x31213121, 0x10211021 },
0081         /* format1, 66Mhz */
0082         { 0xfff4fff4, 0xf35353d3, 0x814102f1, 0x42314231, 0x11311131 }
0083     };
0084
0085     struct pci_dev *pdev = to_pci_dev(ap->host->dev);
0086     u32 format;
0087     unsigned int reg = 0x40 + 0x10 * ap->port_no;
0088     int mode = adev->pio_mode - XFER_PIO_0;
0089
0090     pci_read_config_dword(pdev, reg + 4, &format);
0091     format >>= 31;
0092     format += sc1200_clock();
0093     pci_write_config_dword(pdev, reg + 8 * adev->devno,
0094                 pio_timings[format][mode]);
0095 }
0096
0097 /**
0098  *  sc1200_set_dmamode      -   DMA timing setup
0099  *  @ap: ATA interface
0100  *  @adev: Device being configured
0101  *
0102  *  We cannot mix MWDMA and UDMA without reloading timings each switch
0103  *  master to slave.
0104  */
0105
0106 static void sc1200_set_dmamode(struct ata_port *ap, struct ata_device *adev)
0107 {
0108     static const u32 udma_timing[3][3] = {
0109         { 0x00921250, 0x00911140, 0x00911030 },
0110         { 0x00932470, 0x00922260, 0x00922140 },
0111         { 0x009436A1, 0x00933481, 0x00923261 }
0112     };
0113
0114     static const u32 mwdma_timing[3][3] = {
0115         { 0x00077771, 0x00012121, 0x00002020 },
0116         { 0x000BBBB2, 0x00024241, 0x00013131 },
0117         { 0x000FFFF3, 0x00035352, 0x00015151 }
0118     };
0119
0120     int clock = sc1200_clock();
0121     struct pci_dev *pdev = to_pci_dev(ap->host->dev);
0122     unsigned int reg = 0x40 + 0x10 * ap->port_no;
0123     int mode = adev->dma_mode;
0124     u32 format;
0125
0126     if (mode >= XFER_UDMA_0)
0127         format = udma_timing[clock][mode - XFER_UDMA_0];
0128     else
0129         format = mwdma_timing[clock][mode - XFER_MW_DMA_0];
0130
0131     if (adev->devno == 0) {
0132         u32 timings;
0133
0134         pci_read_config_dword(pdev, reg + 4, &timings);
0135         timings &= 0x80000000UL;
0136         timings |= format;
0137         pci_write_config_dword(pdev, reg + 4, timings);
0138     } else
0139         pci_write_config_dword(pdev, reg + 12, format);
0140 }
0141
0142 /**
0143  *  sc1200_qc_issue     -   command issue
0144  *  @qc: command pending
0145  *
0146  *  Called when the libata layer is about to issue a command. We wrap
0147  *  this interface so that we can load the correct ATA timings if
0148  *  necessary.  Specifically we have a problem that there is only
0149  *  one MWDMA/UDMA bit.
0150  */
0151
0152 static unsigned int sc1200_qc_issue(struct ata_queued_cmd *qc)
0153 {
0154     struct ata_port *ap = qc->ap;
0155     struct ata_device *adev = qc->dev;
0156     struct ata_device *prev = ap->private_data;
0157
0158     /* See if the DMA settings could be wrong */
0159     if (ata_dma_enabled(adev) && adev != prev && prev != NULL) {
0160         /* Maybe, but do the channels match MWDMA/UDMA ? */
0161         if ((ata_using_udma(adev) && !ata_using_udma(prev)) ||
0162             (ata_using_udma(prev) && !ata_using_udma(adev)))
0163                 /* Switch the mode bits */
0164                 sc1200_set_dmamode(ap, adev);
0165     }
0166
0167     return ata_bmdma_qc_issue(qc);
0168 }
0169
0170 /**
0171  *  sc1200_qc_defer -   implement serialization
0172  *  @qc: command
0173  *
0174  *  Serialize command issue on this controller.
0175  */
0176
0177 static int sc1200_qc_defer(struct ata_queued_cmd *qc)
0178 {
0179     struct ata_host *host = qc->ap->host;
0180     struct ata_port *alt = host->ports[1 ^ qc->ap->port_no];
0181     int rc;
0182
0183     /* First apply the usual rules */
0184     rc = ata_std_qc_defer(qc);
0185     if (rc != 0)
0186         return rc;
0187
0188     /* Now apply serialization rules. Only allow a command if the
0189        other channel state machine is idle */
0190     if (alt && alt->qc_active)
0191         return  ATA_DEFER_PORT;
0192     return 0;
0193 }
0194
0195 static struct scsi_host_template sc1200_sht = {
0196     ATA_BASE_SHT(DRV_NAME),
0197     .sg_tablesize   = LIBATA_DUMB_MAX_PRD,
0198     .dma_boundary   = ATA_DMA_BOUNDARY,
0199 };
0200
0201 static struct ata_port_operations sc1200_port_ops = {
0202     .inherits   = &ata_bmdma_port_ops,
0203     .qc_prep    = ata_bmdma_dumb_qc_prep,
0204     .qc_issue   = sc1200_qc_issue,
0205     .qc_defer   = sc1200_qc_defer,
0206     .cable_detect   = ata_cable_40wire,
0207     .set_piomode    = sc1200_set_piomode,
0208     .set_dmamode    = sc1200_set_dmamode,
0209 };
0210
0211 /**
0212  *  sc1200_init_one     -   Initialise an SC1200
0213  *  @dev: PCI device
0214  *  @id: Entry in match table
0215  *
0216  *  Just throw the needed data at the libata helper and it does all
0217  *  our work.
0218  */
0219
0220 static int sc1200_init_one(struct pci_dev *dev, const struct pci_device_id *id)
0221 {
0222     static const struct ata_port_info info = {
0223         .flags = ATA_FLAG_SLAVE_POSS,
0224         .pio_mask = ATA_PIO4,
0225         .mwdma_mask = ATA_MWDMA2,
0226         .udma_mask = ATA_UDMA2,
0227         .port_ops = &sc1200_port_ops
0228     };
0229     const struct ata_port_info *ppi[] = { &info, NULL };
0230
0231     return ata_pci_bmdma_init_one(dev, ppi, &sc1200_sht, NULL, 0);
0232 }
0233
0234 static const struct pci_device_id sc1200[] = {
0235     { PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_SCx200_IDE), },
0236
0237     { },
0238 };
0239
0240 static struct pci_driver sc1200_pci_driver = {
0241     .name       = DRV_NAME,
0242     .id_table   = sc1200,
0243     .probe      = sc1200_init_one,
0244     .remove     = ata_pci_remove_one,
0245 #ifdef CONFIG_PM_SLEEP
0246     .suspend    = ata_pci_device_suspend,
0247     .resume     = ata_pci_device_resume,
0248 #endif
0249 };
0250
0251 module_pci_driver(sc1200_pci_driver);
0252
0253 MODULE_AUTHOR("Alan Cox, Mark Lord");
0254 MODULE_DESCRIPTION("low-level driver for the NS/AMD SC1200");
0255 MODULE_LICENSE("GPL");
0256 MODULE_DEVICE_TABLE(pci, sc1200);
0257 MODULE_VERSION(DRV_VERSION);