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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/init.h>
 30 #include <linux/blkdev.h>
 31 #include <linux/delay.h>
 32 #include <scsi/scsi_host.h>
 33 #include <linux/libata.h>
 34 
 35 #define DRV_NAME "pata_opti"
 36 #define DRV_VERSION "0.2.9"
 37 
 38 enum {
 39         READ_REG        = 0,    /* index of Read cycle timing register */
 40         WRITE_REG       = 1,    /* index of Write cycle timing register */
 41         CNTRL_REG       = 3,    /* index of Control register */
 42         STRAP_REG       = 5,    /* index of Strap register */
 43         MISC_REG        = 6     /* index of Miscellaneous register */
 44 };
 45 
 46 /**
 47  *      opti_pre_reset          -       probe begin
 48  *      @link: ATA link
 49  *      @deadline: deadline jiffies for the operation
 50  *
 51  *      Set up cable type and use generic probe init
 52  */
 53 
 54 static int opti_pre_reset(struct ata_link *link, unsigned long deadline)
 55 {
 56         struct ata_port *ap = link->ap;
 57         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 58         static const struct pci_bits opti_enable_bits[] = {
 59                 { 0x45, 1, 0x80, 0x00 },
 60                 { 0x40, 1, 0x08, 0x00 }
 61         };
 62 
 63         if (!pci_test_config_bits(pdev, &opti_enable_bits[ap->port_no]))
 64                 return -ENOENT;
 65 
 66         return ata_sff_prereset(link, deadline);
 67 }
 68 
 69 /**
 70  *      opti_write_reg          -       control register setup
 71  *      @ap: ATA port
 72  *      @value: value
 73  *      @reg: control register number
 74  *
 75  *      The Opti uses magic 'trapdoor' register accesses to do configuration
 76  *      rather than using PCI space as other controllers do. The double inw
 77  *      on the error register activates configuration mode. We can then write
 78  *      the control register
 79  */
 80 
 81 static void opti_write_reg(struct ata_port *ap, u8 val, int reg)
 82 {
 83         void __iomem *regio = ap->ioaddr.cmd_addr;
 84 
 85         /* These 3 unlock the control register access */
 86         ioread16(regio + 1);
 87         ioread16(regio + 1);
 88         iowrite8(3, regio + 2);
 89 
 90         /* Do the I/O */
 91         iowrite8(val, regio + reg);
 92 
 93         /* Relock */
 94         iowrite8(0x83, regio + 2);
 95 }
 96 
 97 /**
 98  *      opti_set_piomode        -       set initial PIO mode data
 99  *      @ap: ATA interface
100  *      @adev: ATA device
101  *
102  *      Called to do the PIO mode setup. Timing numbers are taken from
103  *      the FreeBSD driver then pre computed to keep the code clean. There
104  *      are two tables depending on the hardware clock speed.
105  */
106 
107 static void opti_set_piomode(struct ata_port *ap, struct ata_device *adev)
108 {
109         struct ata_device *pair = ata_dev_pair(adev);
110         int clock;
111         int pio = adev->pio_mode - XFER_PIO_0;
112         void __iomem *regio = ap->ioaddr.cmd_addr;
113         u8 addr;
114 
115         /* Address table precomputed with prefetch off and a DCLK of 2 */
116         static const u8 addr_timing[2][5] = {
117                 { 0x30, 0x20, 0x20, 0x10, 0x10 },
118                 { 0x20, 0x20, 0x10, 0x10, 0x10 }
119         };
120         static const u8 data_rec_timing[2][5] = {
121                 { 0x6B, 0x56, 0x42, 0x32, 0x31 },
122                 { 0x58, 0x44, 0x32, 0x22, 0x21 }
123         };
124 
125         iowrite8(0xff, regio + 5);
126         clock = ioread16(regio + 5) & 1;
127 
128         /*
129          *      As with many controllers the address setup time is shared
130          *      and must suit both devices if present.
131          */
132 
133         addr = addr_timing[clock][pio];
134         if (pair) {
135                 /* Hardware constraint */
136                 u8 pair_addr = addr_timing[clock][pair->pio_mode - XFER_PIO_0];
137                 if (pair_addr > addr)
138                         addr = pair_addr;
139         }
140 
141         /* Commence primary programming sequence */
142         opti_write_reg(ap, adev->devno, MISC_REG);
143         opti_write_reg(ap, data_rec_timing[clock][pio], READ_REG);
144         opti_write_reg(ap, data_rec_timing[clock][pio], WRITE_REG);
145         opti_write_reg(ap, addr, MISC_REG);
146 
147         /* Programming sequence complete, override strapping */
148         opti_write_reg(ap, 0x85, CNTRL_REG);
149 }
150 
151 static struct scsi_host_template opti_sht = {
152         ATA_PIO_SHT(DRV_NAME),
153 };
154 
155 static struct ata_port_operations opti_port_ops = {
156         .inherits       = &ata_sff_port_ops,
157         .cable_detect   = ata_cable_40wire,
158         .set_piomode    = opti_set_piomode,
159         .prereset       = opti_pre_reset,
160 };
161 
162 static int opti_init_one(struct pci_dev *dev, const struct pci_device_id *id)
163 {
164         static const struct ata_port_info info = {
165                 .flags = ATA_FLAG_SLAVE_POSS,
166                 .pio_mask = ATA_PIO4,
167                 .port_ops = &opti_port_ops
168         };
169         const struct ata_port_info *ppi[] = { &info, NULL };
170 
171         ata_print_version_once(&dev->dev, DRV_VERSION);
172 
173         return ata_pci_sff_init_one(dev, ppi, &opti_sht, NULL, 0);
174 }
175 
176 static const struct pci_device_id opti[] = {
177         { PCI_VDEVICE(OPTI, PCI_DEVICE_ID_OPTI_82C621), 0 },
178         { PCI_VDEVICE(OPTI, PCI_DEVICE_ID_OPTI_82C825), 1 },
179 
180         { },
181 };
182 
183 static struct pci_driver opti_pci_driver = {
184         .name           = DRV_NAME,
185         .id_table       = opti,
186         .probe          = opti_init_one,
187         .remove         = ata_pci_remove_one,
188 #ifdef CONFIG_PM
189         .suspend        = ata_pci_device_suspend,
190         .resume         = ata_pci_device_resume,
191 #endif
192 };
193 
194 module_pci_driver(opti_pci_driver);
195 
196 MODULE_AUTHOR("Alan Cox");
197 MODULE_DESCRIPTION("low-level driver for Opti 621/621X");
198 MODULE_LICENSE("GPL");
199 MODULE_DEVICE_TABLE(pci, opti);
200 MODULE_VERSION(DRV_VERSION);
201 

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