drivers/ide/slc90e66.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *  Copyright (C) 2000-2002 Andre Hedrick <andre@linux-ide.org>
   4  *  Copyright (C) 2006-2007 MontaVista Software, Inc. <source@mvista.com>
   5  *
   6  * This is a look-alike variation of the ICH0 PIIX4 Ultra-66,
   7  * but this keeps the ISA-Bridge and slots alive.
   8  *
   9  */
  10
  11 #include <linux/types.h>
  12 #include <linux/module.h>
  13 #include <linux/kernel.h>
  14 #include <linux/pci.h>
  15 #include <linux/ide.h>
  16 #include <linux/init.h>
  17
  18 #define DRV_NAME "slc90e66"
  19
  20 static DEFINE_SPINLOCK(slc90e66_lock);
  21
  22 static void slc90e66_set_pio_mode(ide_hwif_t *hwif, ide_drive_t *drive)
  23 {
  24         struct pci_dev *dev     = to_pci_dev(hwif->dev);
  25         int is_slave            = drive->dn & 1;
  26         int master_port         = hwif->channel ? 0x42 : 0x40;
  27         int slave_port          = 0x44;
  28         unsigned long flags;
  29         u16 master_data;
  30         u8 slave_data;
  31         int control = 0;
  32         const u8 pio = drive->pio_mode - XFER_PIO_0;
  33
  34                                      /* ISP  RTC */
  35         static const u8 timings[][2] = {
  36                                         { 0, 0 },
  37                                         { 0, 0 },
  38                                         { 1, 0 },
  39                                         { 2, 1 },
  40                                         { 2, 3 }, };
  41
  42         spin_lock_irqsave(&slc90e66_lock, flags);
  43         pci_read_config_word(dev, master_port, &master_data);
  44
  45         if (pio > 1)
  46                 control |= 1;   /* Programmable timing on */
  47         if (drive->media == ide_disk)
  48                 control |= 4;   /* Prefetch, post write */
  49         if (ide_pio_need_iordy(drive, pio))
  50                 control |= 2;   /* IORDY */
  51         if (is_slave) {
  52                 master_data |=  0x4000;
  53                 master_data &= ~0x0070;
  54                 if (pio > 1) {
  55                         /* Set PPE, IE and TIME */
  56                         master_data |= control << 4;
  57                 }
  58                 pci_read_config_byte(dev, slave_port, &slave_data);
  59                 slave_data &= hwif->channel ? 0x0f : 0xf0;
  60                 slave_data |= ((timings[pio][0] << 2) | timings[pio][1]) <<
  61                                (hwif->channel ? 4 : 0);
  62         } else {
  63                 master_data &= ~0x3307;
  64                 if (pio > 1) {
  65                         /* enable PPE, IE and TIME */
  66                         master_data |= control;
  67                 }
  68                 master_data |= (timings[pio][0] << 12) | (timings[pio][1] << 8);
  69         }
  70         pci_write_config_word(dev, master_port, master_data);
  71         if (is_slave)
  72                 pci_write_config_byte(dev, slave_port, slave_data);
  73         spin_unlock_irqrestore(&slc90e66_lock, flags);
  74 }
  75
  76 static void slc90e66_set_dma_mode(ide_hwif_t *hwif, ide_drive_t *drive)
  77 {
  78         struct pci_dev *dev     = to_pci_dev(hwif->dev);
  79         u8 maslave              = hwif->channel ? 0x42 : 0x40;
  80         int sitre = 0, a_speed  = 7 << (drive->dn * 4);
  81         int u_speed = 0, u_flag = 1 << drive->dn;
  82         u16                     reg4042, reg44, reg48, reg4a;
  83         const u8 speed          = drive->dma_mode;
  84
  85         pci_read_config_word(dev, maslave, &reg4042);
  86         sitre = (reg4042 & 0x4000) ? 1 : 0;
  87         pci_read_config_word(dev, 0x44, &reg44);
  88         pci_read_config_word(dev, 0x48, &reg48);
  89         pci_read_config_word(dev, 0x4a, &reg4a);
  90
  91         if (speed >= XFER_UDMA_0) {
  92                 u_speed = (speed - XFER_UDMA_0) << (drive->dn * 4);
  93
  94                 if (!(reg48 & u_flag))
  95                         pci_write_config_word(dev, 0x48, reg48|u_flag);
  96                 if ((reg4a & a_speed) != u_speed) {
  97                         pci_write_config_word(dev, 0x4a, reg4a & ~a_speed);
  98                         pci_read_config_word(dev, 0x4a, &reg4a);
  99                         pci_write_config_word(dev, 0x4a, reg4a|u_speed);
 100                 }
 101         } else {
 102                 const u8 mwdma_to_pio[] = { 0, 3, 4 };
 103
 104                 if (reg48 & u_flag)
 105                         pci_write_config_word(dev, 0x48, reg48 & ~u_flag);
 106                 if (reg4a & a_speed)
 107                         pci_write_config_word(dev, 0x4a, reg4a & ~a_speed);
 108
 109                 if (speed >= XFER_MW_DMA_0)
 110                         drive->pio_mode =
 111                                 mwdma_to_pio[speed - XFER_MW_DMA_0] + XFER_PIO_0;
 112                 else
 113                         drive->pio_mode = XFER_PIO_2; /* for SWDMA2 */
 114
 115                 slc90e66_set_pio_mode(hwif, drive);
 116         }
 117 }
 118
 119 static u8 slc90e66_cable_detect(ide_hwif_t *hwif)
 120 {
 121         struct pci_dev *dev = to_pci_dev(hwif->dev);
 122         u8 reg47 = 0, mask = hwif->channel ? 0x01 : 0x02;
 123
 124         pci_read_config_byte(dev, 0x47, &reg47);
 125
 126         /* bit[0(1)]: 0:80, 1:40 */
 127         return (reg47 & mask) ? ATA_CBL_PATA40 : ATA_CBL_PATA80;
 128 }
 129
 130 static const struct ide_port_ops slc90e66_port_ops = {
 131         .set_pio_mode           = slc90e66_set_pio_mode,
 132         .set_dma_mode           = slc90e66_set_dma_mode,
 133         .cable_detect           = slc90e66_cable_detect,
 134 };
 135
 136 static const struct ide_port_info slc90e66_chipset = {
 137         .name           = DRV_NAME,
 138         .enablebits     = { {0x41, 0x80, 0x80}, {0x43, 0x80, 0x80} },
 139         .port_ops       = &slc90e66_port_ops,
 140         .pio_mask       = ATA_PIO4,
 141         .swdma_mask     = ATA_SWDMA2_ONLY,
 142         .mwdma_mask     = ATA_MWDMA12_ONLY,
 143         .udma_mask      = ATA_UDMA4,
 144 };
 145
 146 static int slc90e66_init_one(struct pci_dev *dev,
 147                              const struct pci_device_id *id)
 148 {
 149         return ide_pci_init_one(dev, &slc90e66_chipset, NULL);
 150 }
 151
 152 static const struct pci_device_id slc90e66_pci_tbl[] = {
 153         { PCI_VDEVICE(EFAR, PCI_DEVICE_ID_EFAR_SLC90E66_1), 0 },
 154         { 0, },
 155 };
 156 MODULE_DEVICE_TABLE(pci, slc90e66_pci_tbl);
 157
 158 static struct pci_driver slc90e66_pci_driver = {
 159         .name           = "SLC90e66_IDE",
 160         .id_table       = slc90e66_pci_tbl,
 161         .probe          = slc90e66_init_one,
 162         .remove         = ide_pci_remove,
 163         .suspend        = ide_pci_suspend,
 164         .resume         = ide_pci_resume,
 165 };
 166
 167 static int __init slc90e66_ide_init(void)
 168 {
 169         return ide_pci_register_driver(&slc90e66_pci_driver);
 170 }
 171
 172 static void __exit slc90e66_ide_exit(void)
 173 {
 174         pci_unregister_driver(&slc90e66_pci_driver);
 175 }
 176
 177 module_init(slc90e66_ide_init);
 178 module_exit(slc90e66_ide_exit);
 179
 180 MODULE_AUTHOR("Andre Hedrick");
 181 MODULE_DESCRIPTION("PCI driver module for SLC90E66 IDE");
 182 MODULE_LICENSE("GPL");