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Linux/drivers/ata/pata_opti.c

  1 /*
  2  * pata_opti.c  - ATI PATA for new ATA layer
  3  *                        (C) 2005 Red Hat Inc
  4  *
  5  * Based on
  6  *  linux/drivers/ide/pci/opti621.c             Version 0.7     Sept 10, 2002
  7  *
  8  *  Copyright (C) 1996-1998  Linus Torvalds & authors (see below)
  9  *
 10  * Authors:
 11  * Jaromir Koutek <miri@punknet.cz>,
 12  * Jan Harkes <jaharkes@cwi.nl>,
 13  * Mark Lord <mlord@pobox.com>
 14  * Some parts of code are from ali14xx.c and from rz1000.c.
 15  *
 16  * Also consulted the FreeBSD prototype driver by Kevin Day to try
 17  * and resolve some confusions. Further documentation can be found in
 18  * Ralf Brown's interrupt list
 19  *
 20  * If you have other variants of the Opti range (Viper/Vendetta) please
 21  * try this driver with those PCI idents and report back. For the later
 22  * chips see the pata_optidma driver
 23  *
 24  */
 25 
 26 #include <linux/kernel.h>
 27 #include <linux/module.h>
 28 #include <linux/pci.h>
 29 #include <linux/blkdev.h>
 30 #include <linux/delay.h>
 31 #include <scsi/scsi_host.h>
 32 #include <linux/libata.h>
 33 
 34 #define DRV_NAME "pata_opti"
 35 #define DRV_VERSION "0.2.9"
 36 
 37 enum {
 38         READ_REG        = 0,    /* index of Read cycle timing register */
 39         WRITE_REG       = 1,    /* index of Write cycle timing register */
 40         CNTRL_REG       = 3,    /* index of Control register */
 41         STRAP_REG       = 5,    /* index of Strap register */
 42         MISC_REG        = 6     /* index of Miscellaneous register */
 43 };
 44 
 45 /**
 46  *      opti_pre_reset          -       probe begin
 47  *      @link: ATA link
 48  *      @deadline: deadline jiffies for the operation
 49  *
 50  *      Set up cable type and use generic probe init
 51  */
 52 
 53 static int opti_pre_reset(struct ata_link *link, unsigned long deadline)
 54 {
 55         struct ata_port *ap = link->ap;
 56         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 57         static const struct pci_bits opti_enable_bits[] = {
 58                 { 0x45, 1, 0x80, 0x00 },
 59                 { 0x40, 1, 0x08, 0x00 }
 60         };
 61 
 62         if (!pci_test_config_bits(pdev, &opti_enable_bits[ap->port_no]))
 63                 return -ENOENT;
 64 
 65         return ata_sff_prereset(link, deadline);
 66 }
 67 
 68 /**
 69  *      opti_write_reg          -       control register setup
 70  *      @ap: ATA port
 71  *      @value: value
 72  *      @reg: control register number
 73  *
 74  *      The Opti uses magic 'trapdoor' register accesses to do configuration
 75  *      rather than using PCI space as other controllers do. The double inw
 76  *      on the error register activates configuration mode. We can then write
 77  *      the control register
 78  */
 79 
 80 static void opti_write_reg(struct ata_port *ap, u8 val, int reg)
 81 {
 82         void __iomem *regio = ap->ioaddr.cmd_addr;
 83 
 84         /* These 3 unlock the control register access */
 85         ioread16(regio + 1);
 86         ioread16(regio + 1);
 87         iowrite8(3, regio + 2);
 88 
 89         /* Do the I/O */
 90         iowrite8(val, regio + reg);
 91 
 92         /* Relock */
 93         iowrite8(0x83, regio + 2);
 94 }
 95 
 96 /**
 97  *      opti_set_piomode        -       set initial PIO mode data
 98  *      @ap: ATA interface
 99  *      @adev: ATA device
100  *
101  *      Called to do the PIO mode setup. Timing numbers are taken from
102  *      the FreeBSD driver then pre computed to keep the code clean. There
103  *      are two tables depending on the hardware clock speed.
104  */
105 
106 static void opti_set_piomode(struct ata_port *ap, struct ata_device *adev)
107 {
108         struct ata_device *pair = ata_dev_pair(adev);
109         int clock;
110         int pio = adev->pio_mode - XFER_PIO_0;
111         void __iomem *regio = ap->ioaddr.cmd_addr;
112         u8 addr;
113 
114         /* Address table precomputed with prefetch off and a DCLK of 2 */
115         static const u8 addr_timing[2][5] = {
116                 { 0x30, 0x20, 0x20, 0x10, 0x10 },
117                 { 0x20, 0x20, 0x10, 0x10, 0x10 }
118         };
119         static const u8 data_rec_timing[2][5] = {
120                 { 0x6B, 0x56, 0x42, 0x32, 0x31 },
121                 { 0x58, 0x44, 0x32, 0x22, 0x21 }
122         };
123 
124         iowrite8(0xff, regio + 5);
125         clock = ioread16(regio + 5) & 1;
126 
127         /*
128          *      As with many controllers the address setup time is shared
129          *      and must suit both devices if present.
130          */
131 
132         addr = addr_timing[clock][pio];
133         if (pair) {
134                 /* Hardware constraint */
135                 u8 pair_addr = addr_timing[clock][pair->pio_mode - XFER_PIO_0];
136                 if (pair_addr > addr)
137                         addr = pair_addr;
138         }
139 
140         /* Commence primary programming sequence */
141         opti_write_reg(ap, adev->devno, MISC_REG);
142         opti_write_reg(ap, data_rec_timing[clock][pio], READ_REG);
143         opti_write_reg(ap, data_rec_timing[clock][pio], WRITE_REG);
144         opti_write_reg(ap, addr, MISC_REG);
145 
146         /* Programming sequence complete, override strapping */
147         opti_write_reg(ap, 0x85, CNTRL_REG);
148 }
149 
150 static struct scsi_host_template opti_sht = {
151         ATA_PIO_SHT(DRV_NAME),
152 };
153 
154 static struct ata_port_operations opti_port_ops = {
155         .inherits       = &ata_sff_port_ops,
156         .cable_detect   = ata_cable_40wire,
157         .set_piomode    = opti_set_piomode,
158         .prereset       = opti_pre_reset,
159 };
160 
161 static int opti_init_one(struct pci_dev *dev, const struct pci_device_id *id)
162 {
163         static const struct ata_port_info info = {
164                 .flags = ATA_FLAG_SLAVE_POSS,
165                 .pio_mask = ATA_PIO4,
166                 .port_ops = &opti_port_ops
167         };
168         const struct ata_port_info *ppi[] = { &info, NULL };
169 
170         ata_print_version_once(&dev->dev, DRV_VERSION);
171 
172         return ata_pci_sff_init_one(dev, ppi, &opti_sht, NULL, 0);
173 }
174 
175 static const struct pci_device_id opti[] = {
176         { PCI_VDEVICE(OPTI, PCI_DEVICE_ID_OPTI_82C621), 0 },
177         { PCI_VDEVICE(OPTI, PCI_DEVICE_ID_OPTI_82C825), 1 },
178 
179         { },
180 };
181 
182 static struct pci_driver opti_pci_driver = {
183         .name           = DRV_NAME,
184         .id_table       = opti,
185         .probe          = opti_init_one,
186         .remove         = ata_pci_remove_one,
187 #ifdef CONFIG_PM
188         .suspend        = ata_pci_device_suspend,
189         .resume         = ata_pci_device_resume,
190 #endif
191 };
192 
193 module_pci_driver(opti_pci_driver);
194 
195 MODULE_AUTHOR("Alan Cox");
196 MODULE_DESCRIPTION("low-level driver for Opti 621/621X");
197 MODULE_LICENSE("GPL");
198 MODULE_DEVICE_TABLE(pci, opti);
199 MODULE_VERSION(DRV_VERSION);
200 

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