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Linux/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 = {
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 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");
217 

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