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Linux/drivers/ide/cs5520.c

  1 /*
  2  *      IDE tuning and bus mastering support for the CS5510/CS5520
  3  *      chipsets
  4  *
  5  *      The CS5510/CS5520 are slightly unusual devices. Unlike the 
  6  *      typical IDE controllers they do bus mastering with the drive in
  7  *      PIO mode and smarter silicon.
  8  *
  9  *      The practical upshot of this is that we must always tune the
 10  *      drive for the right PIO mode. We must also ignore all the blacklists
 11  *      and the drive bus mastering DMA information.
 12  *
 13  *      *** This driver is strictly experimental ***
 14  *
 15  *      (c) Copyright Red Hat Inc 2002
 16  * 
 17  * This program is free software; you can redistribute it and/or modify it
 18  * under the terms of the GNU General Public License as published by the
 19  * Free Software Foundation; either version 2, or (at your option) any
 20  * later version.
 21  *
 22  * This program is distributed in the hope that it will be useful, but
 23  * WITHOUT ANY WARRANTY; without even the implied warranty of
 24  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 25  * General Public License for more details.
 26  *
 27  * For the avoidance of doubt the "preferred form" of this code is one which
 28  * is in an open non patent encumbered format. Where cryptographic key signing
 29  * forms part of the process of creating an executable the information
 30  * including keys needed to generate an equivalently functional executable
 31  * are deemed to be part of the source code.
 32  *
 33  */
 34  
 35 #include <linux/module.h>
 36 #include <linux/types.h>
 37 #include <linux/kernel.h>
 38 #include <linux/init.h>
 39 #include <linux/pci.h>
 40 #include <linux/ide.h>
 41 #include <linux/dma-mapping.h>
 42 
 43 #define DRV_NAME "cs5520"
 44 
 45 struct pio_clocks
 46 {
 47         int address;
 48         int assert;
 49         int recovery;
 50 };
 51 
 52 static struct pio_clocks cs5520_pio_clocks[]={
 53         {3, 6, 11},
 54         {2, 5, 6},
 55         {1, 4, 3},
 56         {1, 3, 2},
 57         {1, 2, 1}
 58 };
 59 
 60 static void cs5520_set_pio_mode(ide_hwif_t *hwif, ide_drive_t *drive)
 61 {
 62         struct pci_dev *pdev = to_pci_dev(hwif->dev);
 63         int controller = drive->dn > 1 ? 1 : 0;
 64         const u8 pio = drive->pio_mode - XFER_PIO_0;
 65 
 66         /* 8bit CAT/CRT - 8bit command timing for channel */
 67         pci_write_config_byte(pdev, 0x62 + controller, 
 68                 (cs5520_pio_clocks[pio].recovery << 4) |
 69                 (cs5520_pio_clocks[pio].assert));
 70 
 71         /* 0x64 - 16bit Primary, 0x68 - 16bit Secondary */
 72 
 73         /* FIXME: should these use address ? */
 74         /* Data read timing */
 75         pci_write_config_byte(pdev, 0x64 + 4*controller + (drive->dn&1),
 76                 (cs5520_pio_clocks[pio].recovery << 4) |
 77                 (cs5520_pio_clocks[pio].assert));
 78         /* Write command timing */
 79         pci_write_config_byte(pdev, 0x66 + 4*controller + (drive->dn&1),
 80                 (cs5520_pio_clocks[pio].recovery << 4) |
 81                 (cs5520_pio_clocks[pio].assert));
 82 }
 83 
 84 static void cs5520_set_dma_mode(ide_hwif_t *hwif, ide_drive_t *drive)
 85 {
 86         printk(KERN_ERR "cs55x0: bad ide timing.\n");
 87 
 88         drive->pio_mode = XFER_PIO_0 + 0;
 89         cs5520_set_pio_mode(hwif, drive);
 90 }
 91 
 92 static const struct ide_port_ops cs5520_port_ops = {
 93         .set_pio_mode           = cs5520_set_pio_mode,
 94         .set_dma_mode           = cs5520_set_dma_mode,
 95 };
 96 
 97 static const struct ide_port_info cyrix_chipset = {
 98         .name           = DRV_NAME,
 99         .enablebits     = { { 0x60, 0x01, 0x01 }, { 0x60, 0x02, 0x02 } },
100         .port_ops       = &cs5520_port_ops,
101         .host_flags     = IDE_HFLAG_ISA_PORTS | IDE_HFLAG_CS5520,
102         .pio_mask       = ATA_PIO4,
103 };
104 
105 /*
106  *      The 5510/5520 are a bit weird. They don't quite set up the way
107  *      the PCI helper layer expects so we must do much of the set up 
108  *      work longhand.
109  */
110  
111 static int cs5520_init_one(struct pci_dev *dev, const struct pci_device_id *id)
112 {
113         const struct ide_port_info *d = &cyrix_chipset;
114         struct ide_hw hw[2], *hws[] = { NULL, NULL };
115 
116         ide_setup_pci_noise(dev, d);
117 
118         /* We must not grab the entire device, it has 'ISA' space in its
119          * BARS too and we will freak out other bits of the kernel
120          */
121         if (pci_enable_device_io(dev)) {
122                 printk(KERN_WARNING "%s: Unable to enable 55x0.\n", d->name);
123                 return -ENODEV;
124         }
125         pci_set_master(dev);
126         if (pci_set_dma_mask(dev, DMA_BIT_MASK(32))) {
127                 printk(KERN_WARNING "%s: No suitable DMA available.\n",
128                         d->name);
129                 return -ENODEV;
130         }
131 
132         /*
133          *      Now the chipset is configured we can let the core
134          *      do all the device setup for us
135          */
136 
137         ide_pci_setup_ports(dev, d, &hw[0], &hws[0]);
138         hw[0].irq = 14;
139         hw[1].irq = 15;
140 
141         return ide_host_add(d, hws, 2, NULL);
142 }
143 
144 static const struct pci_device_id cs5520_pci_tbl[] = {
145         { PCI_VDEVICE(CYRIX, PCI_DEVICE_ID_CYRIX_5510), 0 },
146         { PCI_VDEVICE(CYRIX, PCI_DEVICE_ID_CYRIX_5520), 1 },
147         { 0, },
148 };
149 MODULE_DEVICE_TABLE(pci, cs5520_pci_tbl);
150 
151 static struct pci_driver cs5520_pci_driver = {
152         .name           = "Cyrix_IDE",
153         .id_table       = cs5520_pci_tbl,
154         .probe          = cs5520_init_one,
155         .suspend        = ide_pci_suspend,
156         .resume         = ide_pci_resume,
157 };
158 
159 static int __init cs5520_ide_init(void)
160 {
161         return ide_pci_register_driver(&cs5520_pci_driver);
162 }
163 
164 module_init(cs5520_ide_init);
165 
166 MODULE_AUTHOR("Alan Cox");
167 MODULE_DESCRIPTION("PCI driver module for Cyrix 5510/5520 IDE");
168 MODULE_LICENSE("GPL");
169 

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