linux/drivers/ide/it8213.c
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   1/*
   2 * ITE 8213 IDE driver
   3 *
   4 * Copyright (C) 2006 Jack Lee
   5 * Copyright (C) 2006 Alan Cox
   6 * Copyright (C) 2007 Bartlomiej Zolnierkiewicz
   7 */
   8
   9#include <linux/kernel.h>
  10#include <linux/types.h>
  11#include <linux/module.h>
  12#include <linux/pci.h>
  13#include <linux/ide.h>
  14#include <linux/init.h>
  15
  16#define DRV_NAME "it8213"
  17
  18/**
  19 *      it8213_set_pio_mode     -       set host controller for PIO mode
  20 *      @hwif: port
  21 *      @drive: drive
  22 *
  23 *      Set the interface PIO mode.
  24 */
  25
  26static void it8213_set_pio_mode(ide_hwif_t *hwif, ide_drive_t *drive)
  27{
  28        struct pci_dev *dev     = to_pci_dev(hwif->dev);
  29        int is_slave            = drive->dn & 1;
  30        int master_port         = 0x40;
  31        int slave_port          = 0x44;
  32        unsigned long flags;
  33        u16 master_data;
  34        u8 slave_data;
  35        static DEFINE_SPINLOCK(tune_lock);
  36        int control = 0;
  37        const u8 pio = drive->pio_mode - XFER_PIO_0;
  38
  39        static const u8 timings[][2] = {
  40                                        { 0, 0 },
  41                                        { 0, 0 },
  42                                        { 1, 0 },
  43                                        { 2, 1 },
  44                                        { 2, 3 }, };
  45
  46        spin_lock_irqsave(&tune_lock, flags);
  47        pci_read_config_word(dev, master_port, &master_data);
  48
  49        if (pio > 1)
  50                control |= 1;   /* Programmable timing on */
  51        if (drive->media != ide_disk)
  52                control |= 4;   /* ATAPI */
  53        if (ide_pio_need_iordy(drive, pio))
  54                control |= 2;   /* IORDY */
  55        if (is_slave) {
  56                master_data |=  0x4000;
  57                master_data &= ~0x0070;
  58                if (pio > 1)
  59                        master_data = master_data | (control << 4);
  60                pci_read_config_byte(dev, slave_port, &slave_data);
  61                slave_data = slave_data & 0xf0;
  62                slave_data = slave_data | (timings[pio][0] << 2) | timings[pio][1];
  63        } else {
  64                master_data &= ~0x3307;
  65                if (pio > 1)
  66                        master_data = master_data | control;
  67                master_data = master_data | (timings[pio][0] << 12) | (timings[pio][1] << 8);
  68        }
  69        pci_write_config_word(dev, master_port, master_data);
  70        if (is_slave)
  71                pci_write_config_byte(dev, slave_port, slave_data);
  72        spin_unlock_irqrestore(&tune_lock, flags);
  73}
  74
  75/**
  76 *      it8213_set_dma_mode     -       set host controller for DMA mode
  77 *      @hwif: port
  78 *      @drive: drive
  79 *
  80 *      Tune the ITE chipset for the DMA mode.
  81 */
  82
  83static void it8213_set_dma_mode(ide_hwif_t *hwif, ide_drive_t *drive)
  84{
  85        struct pci_dev *dev     = to_pci_dev(hwif->dev);
  86        u8 maslave              = 0x40;
  87        int a_speed             = 3 << (drive->dn * 4);
  88        int u_flag              = 1 << drive->dn;
  89        int v_flag              = 0x01 << drive->dn;
  90        int w_flag              = 0x10 << drive->dn;
  91        int u_speed             = 0;
  92        u16                     reg4042, reg4a;
  93        u8                      reg48, reg54, reg55;
  94        const u8 speed          = drive->dma_mode;
  95
  96        pci_read_config_word(dev, maslave, &reg4042);
  97        pci_read_config_byte(dev, 0x48, &reg48);
  98        pci_read_config_word(dev, 0x4a, &reg4a);
  99        pci_read_config_byte(dev, 0x54, &reg54);
 100        pci_read_config_byte(dev, 0x55, &reg55);
 101
 102        if (speed >= XFER_UDMA_0) {
 103                u8 udma = speed - XFER_UDMA_0;
 104
 105                u_speed = min_t(u8, 2 - (udma & 1), udma) << (drive->dn * 4);
 106
 107                if (!(reg48 & u_flag))
 108                        pci_write_config_byte(dev, 0x48, reg48 | u_flag);
 109                if (speed >= XFER_UDMA_5)
 110                        pci_write_config_byte(dev, 0x55, (u8) reg55|w_flag);
 111                else
 112                        pci_write_config_byte(dev, 0x55, (u8) reg55 & ~w_flag);
 113
 114                if ((reg4a & a_speed) != u_speed)
 115                        pci_write_config_word(dev, 0x4a, (reg4a & ~a_speed) | u_speed);
 116                if (speed > XFER_UDMA_2) {
 117                        if (!(reg54 & v_flag))
 118                                pci_write_config_byte(dev, 0x54, reg54 | v_flag);
 119                } else
 120                        pci_write_config_byte(dev, 0x54, reg54 & ~v_flag);
 121        } else {
 122                const u8 mwdma_to_pio[] = { 0, 3, 4 };
 123
 124                if (reg48 & u_flag)
 125                        pci_write_config_byte(dev, 0x48, reg48 & ~u_flag);
 126                if (reg4a & a_speed)
 127                        pci_write_config_word(dev, 0x4a, reg4a & ~a_speed);
 128                if (reg54 & v_flag)
 129                        pci_write_config_byte(dev, 0x54, reg54 & ~v_flag);
 130                if (reg55 & w_flag)
 131                        pci_write_config_byte(dev, 0x55, (u8) reg55 & ~w_flag);
 132
 133                if (speed >= XFER_MW_DMA_0)
 134                        drive->pio_mode =
 135                                mwdma_to_pio[speed - XFER_MW_DMA_0] + XFER_PIO_0;
 136                else
 137                        drive->pio_mode = XFER_PIO_2; /* for SWDMA2 */
 138
 139                it8213_set_pio_mode(hwif, drive);
 140        }
 141}
 142
 143static u8 it8213_cable_detect(ide_hwif_t *hwif)
 144{
 145        struct pci_dev *dev = to_pci_dev(hwif->dev);
 146        u8 reg42h = 0;
 147
 148        pci_read_config_byte(dev, 0x42, &reg42h);
 149
 150        return (reg42h & 0x02) ? ATA_CBL_PATA40 : ATA_CBL_PATA80;
 151}
 152
 153static const struct ide_port_ops it8213_port_ops = {
 154        .set_pio_mode           = it8213_set_pio_mode,
 155        .set_dma_mode           = it8213_set_dma_mode,
 156        .cable_detect           = it8213_cable_detect,
 157};
 158
 159static const struct ide_port_info it8213_chipset = {
 160        .name           = DRV_NAME,
 161        .enablebits     = { {0x41, 0x80, 0x80} },
 162        .port_ops       = &it8213_port_ops,
 163        .host_flags     = IDE_HFLAG_SINGLE,
 164        .pio_mask       = ATA_PIO4,
 165        .swdma_mask     = ATA_SWDMA2_ONLY,
 166        .mwdma_mask     = ATA_MWDMA12_ONLY,
 167        .udma_mask      = ATA_UDMA6,
 168};
 169
 170/**
 171 *      it8213_init_one -       pci layer discovery entry
 172 *      @dev: PCI device
 173 *      @id: ident table entry
 174 *
 175 *      Called by the PCI code when it finds an ITE8213 controller. As
 176 *      this device follows the standard interfaces we can use the
 177 *      standard helper functions to do almost all the work for us.
 178 */
 179
 180static int it8213_init_one(struct pci_dev *dev, const struct pci_device_id *id)
 181{
 182        return ide_pci_init_one(dev, &it8213_chipset, NULL);
 183}
 184
 185static const struct pci_device_id it8213_pci_tbl[] = {
 186        { PCI_VDEVICE(ITE, PCI_DEVICE_ID_ITE_8213), 0 },
 187        { 0, },
 188};
 189
 190MODULE_DEVICE_TABLE(pci, it8213_pci_tbl);
 191
 192static struct pci_driver it8213_pci_driver = {
 193        .name           = "ITE8213_IDE",
 194        .id_table       = it8213_pci_tbl,
 195        .probe          = it8213_init_one,
 196        .remove         = ide_pci_remove,
 197        .suspend        = ide_pci_suspend,
 198        .resume         = ide_pci_resume,
 199};
 200
 201static int __init it8213_ide_init(void)
 202{
 203        return ide_pci_register_driver(&it8213_pci_driver);
 204}
 205
 206static void __exit it8213_ide_exit(void)
 207{
 208        pci_unregister_driver(&it8213_pci_driver);
 209}
 210
 211module_init(it8213_ide_init);
 212module_exit(it8213_ide_exit);
 213
 214MODULE_AUTHOR("Jack Lee, Alan Cox");
 215MODULE_DESCRIPTION("PCI driver module for the ITE 8213");
 216MODULE_LICENSE("GPL");
 217
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