Root/drivers/ata/ata_generic.c

1/*
2 * ata_generic.c - Generic PATA/SATA controller driver.
3 * Copyright 2005 Red Hat Inc, all rights reserved.
4 *
5 * Elements from ide/pci/generic.c
6 * Copyright (C) 2001-2002 Andre Hedrick <andre@linux-ide.org>
7 * Portions (C) Copyright 2002 Red Hat Inc <alan@redhat.com>
8 *
9 * May be copied or modified under the terms of the GNU General Public License
10 *
11 * Driver for PCI IDE interfaces implementing the standard bus mastering
12 * interface functionality. This assumes the BIOS did the drive set up and
13 * tuning for us. By default we do not grab all IDE class devices as they
14 * may have other drivers or need fixups to avoid problems. Instead we keep
15 * a default list of stuff without documentation/driver that appears to
16 * work.
17 */
18
19#include <linux/kernel.h>
20#include <linux/module.h>
21#include <linux/pci.h>
22#include <linux/init.h>
23#include <linux/blkdev.h>
24#include <linux/delay.h>
25#include <scsi/scsi_host.h>
26#include <linux/libata.h>
27
28#define DRV_NAME "ata_generic"
29#define DRV_VERSION "0.2.15"
30
31/*
32 * A generic parallel ATA driver using libata
33 */
34
35enum {
36    ATA_GEN_CLASS_MATCH = (1 << 0),
37    ATA_GEN_FORCE_DMA = (1 << 1),
38    ATA_GEN_INTEL_IDER = (1 << 2),
39};
40
41/**
42 * generic_set_mode - mode setting
43 * @link: link to set up
44 * @unused: returned device on error
45 *
46 * Use a non standard set_mode function. We don't want to be tuned.
47 * The BIOS configured everything. Our job is not to fiddle. We
48 * read the dma enabled bits from the PCI configuration of the device
49 * and respect them.
50 */
51
52static int generic_set_mode(struct ata_link *link, struct ata_device **unused)
53{
54    struct ata_port *ap = link->ap;
55    const struct pci_device_id *id = ap->host->private_data;
56    int dma_enabled = 0;
57    struct ata_device *dev;
58
59    if (id->driver_data & ATA_GEN_FORCE_DMA) {
60        dma_enabled = 0xff;
61    } else if (ap->ioaddr.bmdma_addr) {
62        /* Bits 5 and 6 indicate if DMA is active on master/slave */
63        dma_enabled = ioread8(ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);
64    }
65
66    ata_for_each_dev(dev, link, ENABLED) {
67        /* We don't really care */
68        dev->pio_mode = XFER_PIO_0;
69        dev->dma_mode = XFER_MW_DMA_0;
70        /* We do need the right mode information for DMA or PIO
71           and this comes from the current configuration flags */
72        if (dma_enabled & (1 << (5 + dev->devno))) {
73            unsigned int xfer_mask = ata_id_xfermask(dev->id);
74            const char *name;
75
76            if (xfer_mask & (ATA_MASK_MWDMA | ATA_MASK_UDMA))
77                name = ata_mode_string(xfer_mask);
78            else {
79                /* SWDMA perhaps? */
80                name = "DMA";
81                xfer_mask |= ata_xfer_mode2mask(XFER_MW_DMA_0);
82            }
83
84            ata_dev_info(dev, "configured for %s\n", name);
85
86            dev->xfer_mode = ata_xfer_mask2mode(xfer_mask);
87            dev->xfer_shift = ata_xfer_mode2shift(dev->xfer_mode);
88            dev->flags &= ~ATA_DFLAG_PIO;
89        } else {
90            ata_dev_info(dev, "configured for PIO\n");
91            dev->xfer_mode = XFER_PIO_0;
92            dev->xfer_shift = ATA_SHIFT_PIO;
93            dev->flags |= ATA_DFLAG_PIO;
94        }
95    }
96    return 0;
97}
98
99static struct scsi_host_template generic_sht = {
100    ATA_BMDMA_SHT(DRV_NAME),
101};
102
103static struct ata_port_operations generic_port_ops = {
104    .inherits = &ata_bmdma_port_ops,
105    .cable_detect = ata_cable_unknown,
106    .set_mode = generic_set_mode,
107};
108
109static int all_generic_ide; /* Set to claim all devices */
110
111/**
112 * is_intel_ider - identify intel IDE-R devices
113 * @dev: PCI device
114 *
115 * Distinguish Intel IDE-R controller devices from other Intel IDE
116 * devices. IDE-R devices have no timing registers and are in
117 * most respects virtual. They should be driven by the ata_generic
118 * driver.
119 *
120 * IDE-R devices have PCI offset 0xF8.L as zero, later Intel ATA has
121 * it non zero. All Intel ATA has 0x40 writable (timing), but it is
122 * not writable on IDE-R devices (this is guaranteed).
123 */
124
125static int is_intel_ider(struct pci_dev *dev)
126{
127    /* For Intel IDE the value at 0xF8 is only zero on IDE-R
128       interfaces */
129    u32 r;
130    u16 t;
131
132    /* Check the manufacturing ID, it will be zero for IDE-R */
133    pci_read_config_dword(dev, 0xF8, &r);
134    /* Not IDE-R: punt so that ata_(old)piix gets it */
135    if (r != 0)
136        return 0;
137    /* 0xF8 will also be zero on some early Intel IDE devices
138       but they will have a sane timing register */
139    pci_read_config_word(dev, 0x40, &t);
140    if (t != 0)
141        return 0;
142    /* Finally check if the timing register is writable so that
143       we eliminate any early devices hot-docked in a docking
144       station */
145    pci_write_config_word(dev, 0x40, 1);
146    pci_read_config_word(dev, 0x40, &t);
147    if (t) {
148        pci_write_config_word(dev, 0x40, 0);
149        return 0;
150    }
151    return 1;
152}
153
154/**
155 * ata_generic_init - attach generic IDE
156 * @dev: PCI device found
157 * @id: match entry
158 *
159 * Called each time a matching IDE interface is found. We check if the
160 * interface is one we wish to claim and if so we perform any chip
161 * specific hacks then let the ATA layer do the heavy lifting.
162 */
163
164static int ata_generic_init_one(struct pci_dev *dev, const struct pci_device_id *id)
165{
166    u16 command;
167    static const struct ata_port_info info = {
168        .flags = ATA_FLAG_SLAVE_POSS,
169        .pio_mask = ATA_PIO4,
170        .mwdma_mask = ATA_MWDMA2,
171        .udma_mask = ATA_UDMA5,
172        .port_ops = &generic_port_ops
173    };
174    const struct ata_port_info *ppi[] = { &info, NULL };
175
176    /* Don't use the generic entry unless instructed to do so */
177    if ((id->driver_data & ATA_GEN_CLASS_MATCH) && all_generic_ide == 0)
178        return -ENODEV;
179
180    if ((id->driver_data & ATA_GEN_INTEL_IDER) && !all_generic_ide)
181        if (!is_intel_ider(dev))
182            return -ENODEV;
183
184    /* Devices that need care */
185    if (dev->vendor == PCI_VENDOR_ID_UMC &&
186        dev->device == PCI_DEVICE_ID_UMC_UM8886A &&
187        (!(PCI_FUNC(dev->devfn) & 1)))
188        return -ENODEV;
189
190    if (dev->vendor == PCI_VENDOR_ID_OPTI &&
191        dev->device == PCI_DEVICE_ID_OPTI_82C558 &&
192        (!(PCI_FUNC(dev->devfn) & 1)))
193        return -ENODEV;
194
195    /* Don't re-enable devices in generic mode or we will break some
196       motherboards with disabled and unused IDE controllers */
197    pci_read_config_word(dev, PCI_COMMAND, &command);
198    if (!(command & PCI_COMMAND_IO))
199        return -ENODEV;
200
201    if (dev->vendor == PCI_VENDOR_ID_AL)
202        ata_pci_bmdma_clear_simplex(dev);
203
204    if (dev->vendor == PCI_VENDOR_ID_ATI) {
205        int rc = pcim_enable_device(dev);
206        if (rc < 0)
207            return rc;
208        pcim_pin_device(dev);
209    }
210    return ata_pci_bmdma_init_one(dev, ppi, &generic_sht, (void *)id, 0);
211}
212
213static struct pci_device_id ata_generic[] = {
214    { PCI_DEVICE(PCI_VENDOR_ID_PCTECH, PCI_DEVICE_ID_PCTECH_SAMURAI_IDE), },
215    { PCI_DEVICE(PCI_VENDOR_ID_HOLTEK, PCI_DEVICE_ID_HOLTEK_6565), },
216    { PCI_DEVICE(PCI_VENDOR_ID_UMC, PCI_DEVICE_ID_UMC_UM8673F), },
217    { PCI_DEVICE(PCI_VENDOR_ID_UMC, PCI_DEVICE_ID_UMC_UM8886A), },
218    { PCI_DEVICE(PCI_VENDOR_ID_UMC, PCI_DEVICE_ID_UMC_UM8886BF), },
219    { PCI_DEVICE(PCI_VENDOR_ID_HINT, PCI_DEVICE_ID_HINT_VXPROII_IDE), },
220    { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C561), },
221    { PCI_DEVICE(PCI_VENDOR_ID_OPTI, PCI_DEVICE_ID_OPTI_82C558), },
222    { PCI_DEVICE(PCI_VENDOR_ID_CENATEK,PCI_DEVICE_ID_CENATEK_IDE),
223      .driver_data = ATA_GEN_FORCE_DMA },
224    /*
225     * For some reason, MCP89 on MacBook 7,1 doesn't work with
226     * ahci, use ata_generic instead.
227     */
228    { PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP89_SATA,
229      PCI_VENDOR_ID_APPLE, 0xcb89,
230      .driver_data = ATA_GEN_FORCE_DMA },
231#if !defined(CONFIG_PATA_TOSHIBA) && !defined(CONFIG_PATA_TOSHIBA_MODULE)
232    { PCI_DEVICE(PCI_VENDOR_ID_TOSHIBA,PCI_DEVICE_ID_TOSHIBA_PICCOLO_1), },
233    { PCI_DEVICE(PCI_VENDOR_ID_TOSHIBA,PCI_DEVICE_ID_TOSHIBA_PICCOLO_2), },
234    { PCI_DEVICE(PCI_VENDOR_ID_TOSHIBA,PCI_DEVICE_ID_TOSHIBA_PICCOLO_3), },
235    { PCI_DEVICE(PCI_VENDOR_ID_TOSHIBA,PCI_DEVICE_ID_TOSHIBA_PICCOLO_5), },
236#endif
237    /* Intel, IDE class device */
238    { PCI_VENDOR_ID_INTEL, PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID,
239      PCI_CLASS_STORAGE_IDE << 8, 0xFFFFFF00UL,
240      .driver_data = ATA_GEN_INTEL_IDER },
241    /* Must come last. If you add entries adjust this table appropriately */
242    { PCI_DEVICE_CLASS(PCI_CLASS_STORAGE_IDE << 8, 0xFFFFFF00UL),
243      .driver_data = ATA_GEN_CLASS_MATCH },
244    { 0, },
245};
246
247static struct pci_driver ata_generic_pci_driver = {
248    .name = DRV_NAME,
249    .id_table = ata_generic,
250    .probe = ata_generic_init_one,
251    .remove = ata_pci_remove_one,
252#ifdef CONFIG_PM
253    .suspend = ata_pci_device_suspend,
254    .resume = ata_pci_device_resume,
255#endif
256};
257
258module_pci_driver(ata_generic_pci_driver);
259
260MODULE_AUTHOR("Alan Cox");
261MODULE_DESCRIPTION("low-level driver for generic ATA");
262MODULE_LICENSE("GPL");
263MODULE_DEVICE_TABLE(pci, ata_generic);
264MODULE_VERSION(DRV_VERSION);
265
266module_param(all_generic_ide, int, 0);
267

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