release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/ide/it8213.c

   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
  26 static 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
  83 static 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
 143 static 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
 153 static 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
 159 static const struct ide_port_info it8213_chipset __devinitdata = {
 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
 180 static int __devinit 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
 185 static const struct pci_device_id it8213_pci_tbl[] = {
 186         { PCI_VDEVICE(ITE, PCI_DEVICE_ID_ITE_8213), 0 },
 187         { 0, },
 188 };
 189
 190 MODULE_DEVICE_TABLE(pci, it8213_pci_tbl);
 191
 192 static 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
 201 static int __init it8213_ide_init(void)
 202 {
 203         return ide_pci_register_driver(&it8213_pci_driver);
 204 }
 205
 206 static void __exit it8213_ide_exit(void)
 207 {
 208         pci_unregister_driver(&it8213_pci_driver);
 209 }
 210
 211 module_init(it8213_ide_init);
 212 module_exit(it8213_ide_exit);
 213
 214 MODULE_AUTHOR("Jack Lee, Alan Cox");
 215 MODULE_DESCRIPTION("PCI driver module for the ITE 8213");
 216 MODULE_LICENSE("GPL");