Root/drivers/ata/pata_sc1200.c

1/*
2 * New ATA layer SC1200 driver Alan Cox <alan@lxorguk.ukuu.org.uk>
3 *
4 * TODO: Mode selection filtering
5 * TODO: Needs custom DMA cleanup code
6 *
7 * Based very heavily on
8 *
9 * linux/drivers/ide/pci/sc1200.c Version 0.91 28-Jan-2003
10 *
11 * Copyright (C) 2000-2002 Mark Lord <mlord@pobox.com>
12 * May be copied or modified under the terms of the GNU General Public License
13 *
14 * Development of this chipset driver was funded
15 * by the nice folks at National Semiconductor.
16 *
17 * This program is free software; you can redistribute it and/or modify
18 * it under the terms of the GNU General Public License version 2 as
19 * published by the Free Software Foundation.
20 *
21 * This program is distributed in the hope that it will be useful,
22 * but WITHOUT ANY WARRANTY; without even the implied warranty of
23 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
24 * GNU General Public License for more details.
25 *
26 * You should have received a copy of the GNU General Public License
27 * along with this program; if not, write to the Free Software
28 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
29 *
30 */
31
32#include <linux/kernel.h>
33#include <linux/module.h>
34#include <linux/pci.h>
35#include <linux/init.h>
36#include <linux/blkdev.h>
37#include <linux/delay.h>
38#include <scsi/scsi_host.h>
39#include <linux/libata.h>
40
41#define DRV_NAME "pata_sc1200"
42#define DRV_VERSION "0.2.6"
43
44#define SC1200_REV_A 0x00
45#define SC1200_REV_B1 0x01
46#define SC1200_REV_B3 0x02
47#define SC1200_REV_C1 0x03
48#define SC1200_REV_D1 0x04
49
50/**
51 * sc1200_clock - PCI clock
52 *
53 * Return the PCI bus clocking for the SC1200 chipset configuration
54 * in use. We return 0 for 33MHz 1 for 48MHz and 2 for 66Mhz
55 */
56
57static int sc1200_clock(void)
58{
59    /* Magic registers that give us the chipset data */
60    u8 chip_id = inb(0x903C);
61    u8 silicon_rev = inb(0x903D);
62    u16 pci_clock;
63
64    if (chip_id == 0x04 && silicon_rev < SC1200_REV_B1)
65        return 0; /* 33 MHz mode */
66
67    /* Clock generator configuration 0x901E its 8/9 are the PCI clocking
68       0/3 is 33Mhz 1 is 48 2 is 66 */
69
70    pci_clock = inw(0x901E);
71    pci_clock >>= 8;
72    pci_clock &= 0x03;
73    if (pci_clock == 3)
74        pci_clock = 0;
75    return pci_clock;
76}
77
78/**
79 * sc1200_set_piomode - PIO setup
80 * @ap: ATA interface
81 * @adev: device on the interface
82 *
83 * Set our PIO requirements. This is fairly simple on the SC1200
84 */
85
86static void sc1200_set_piomode(struct ata_port *ap, struct ata_device *adev)
87{
88    static const u32 pio_timings[4][5] = {
89        /* format0, 33Mhz */
90        { 0x00009172, 0x00012171, 0x00020080, 0x00032010, 0x00040010 },
91        /* format1, 33Mhz */
92        { 0xd1329172, 0x71212171, 0x30200080, 0x20102010, 0x00100010 },
93        /* format1, 48Mhz */
94        { 0xfaa3f4f3, 0xc23232b2, 0x513101c1, 0x31213121, 0x10211021 },
95        /* format1, 66Mhz */
96        { 0xfff4fff4, 0xf35353d3, 0x814102f1, 0x42314231, 0x11311131 }
97    };
98
99    struct pci_dev *pdev = to_pci_dev(ap->host->dev);
100    u32 format;
101    unsigned int reg = 0x40 + 0x10 * ap->port_no;
102    int mode = adev->pio_mode - XFER_PIO_0;
103
104    pci_read_config_dword(pdev, reg + 4, &format);
105    format >>= 31;
106    format += sc1200_clock();
107    pci_write_config_dword(pdev, reg + 8 * adev->devno,
108                pio_timings[format][mode]);
109}
110
111/**
112 * sc1200_set_dmamode - DMA timing setup
113 * @ap: ATA interface
114 * @adev: Device being configured
115 *
116 * We cannot mix MWDMA and UDMA without reloading timings each switch
117 * master to slave.
118 */
119
120static void sc1200_set_dmamode(struct ata_port *ap, struct ata_device *adev)
121{
122    static const u32 udma_timing[3][3] = {
123        { 0x00921250, 0x00911140, 0x00911030 },
124        { 0x00932470, 0x00922260, 0x00922140 },
125        { 0x009436A1, 0x00933481, 0x00923261 }
126    };
127
128    static const u32 mwdma_timing[3][3] = {
129        { 0x00077771, 0x00012121, 0x00002020 },
130        { 0x000BBBB2, 0x00024241, 0x00013131 },
131        { 0x000FFFF3, 0x00035352, 0x00015151 }
132    };
133
134    int clock = sc1200_clock();
135    struct pci_dev *pdev = to_pci_dev(ap->host->dev);
136    unsigned int reg = 0x40 + 0x10 * ap->port_no;
137    int mode = adev->dma_mode;
138    u32 format;
139
140    if (mode >= XFER_UDMA_0)
141        format = udma_timing[clock][mode - XFER_UDMA_0];
142    else
143        format = mwdma_timing[clock][mode - XFER_MW_DMA_0];
144
145    if (adev->devno == 0) {
146        u32 timings;
147
148        pci_read_config_dword(pdev, reg + 4, &timings);
149        timings &= 0x80000000UL;
150        timings |= format;
151        pci_write_config_dword(pdev, reg + 4, timings);
152    } else
153        pci_write_config_dword(pdev, reg + 12, format);
154}
155
156/**
157 * sc1200_qc_issue - command issue
158 * @qc: command pending
159 *
160 * Called when the libata layer is about to issue a command. We wrap
161 * this interface so that we can load the correct ATA timings if
162 * necessary. Specifically we have a problem that there is only
163 * one MWDMA/UDMA bit.
164 */
165
166static unsigned int sc1200_qc_issue(struct ata_queued_cmd *qc)
167{
168    struct ata_port *ap = qc->ap;
169    struct ata_device *adev = qc->dev;
170    struct ata_device *prev = ap->private_data;
171
172    /* See if the DMA settings could be wrong */
173    if (ata_dma_enabled(adev) && adev != prev && prev != NULL) {
174        /* Maybe, but do the channels match MWDMA/UDMA ? */
175        if ((ata_using_udma(adev) && !ata_using_udma(prev)) ||
176            (ata_using_udma(prev) && !ata_using_udma(adev)))
177                /* Switch the mode bits */
178                sc1200_set_dmamode(ap, adev);
179    }
180
181    return ata_bmdma_qc_issue(qc);
182}
183
184/**
185 * sc1200_qc_defer - implement serialization
186 * @qc: command
187 *
188 * Serialize command issue on this controller.
189 */
190
191static int sc1200_qc_defer(struct ata_queued_cmd *qc)
192{
193    struct ata_host *host = qc->ap->host;
194    struct ata_port *alt = host->ports[1 ^ qc->ap->port_no];
195    int rc;
196
197    /* First apply the usual rules */
198    rc = ata_std_qc_defer(qc);
199    if (rc != 0)
200        return rc;
201
202    /* Now apply serialization rules. Only allow a command if the
203       other channel state machine is idle */
204    if (alt && alt->qc_active)
205        return ATA_DEFER_PORT;
206    return 0;
207}
208
209static struct scsi_host_template sc1200_sht = {
210    ATA_BMDMA_SHT(DRV_NAME),
211    .sg_tablesize = LIBATA_DUMB_MAX_PRD,
212};
213
214static struct ata_port_operations sc1200_port_ops = {
215    .inherits = &ata_bmdma_port_ops,
216    .qc_prep = ata_bmdma_dumb_qc_prep,
217    .qc_issue = sc1200_qc_issue,
218    .qc_defer = sc1200_qc_defer,
219    .cable_detect = ata_cable_40wire,
220    .set_piomode = sc1200_set_piomode,
221    .set_dmamode = sc1200_set_dmamode,
222};
223
224/**
225 * sc1200_init_one - Initialise an SC1200
226 * @dev: PCI device
227 * @id: Entry in match table
228 *
229 * Just throw the needed data at the libata helper and it does all
230 * our work.
231 */
232
233static int sc1200_init_one(struct pci_dev *dev, const struct pci_device_id *id)
234{
235    static const struct ata_port_info info = {
236        .flags = ATA_FLAG_SLAVE_POSS,
237        .pio_mask = ATA_PIO4,
238        .mwdma_mask = ATA_MWDMA2,
239        .udma_mask = ATA_UDMA2,
240        .port_ops = &sc1200_port_ops
241    };
242    const struct ata_port_info *ppi[] = { &info, NULL };
243
244    return ata_pci_bmdma_init_one(dev, ppi, &sc1200_sht, NULL, 0);
245}
246
247static const struct pci_device_id sc1200[] = {
248    { PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_SCx200_IDE), },
249
250    { },
251};
252
253static struct pci_driver sc1200_pci_driver = {
254    .name = DRV_NAME,
255    .id_table = sc1200,
256    .probe = sc1200_init_one,
257    .remove = ata_pci_remove_one,
258#ifdef CONFIG_PM
259    .suspend = ata_pci_device_suspend,
260    .resume = ata_pci_device_resume,
261#endif
262};
263
264module_pci_driver(sc1200_pci_driver);
265
266MODULE_AUTHOR("Alan Cox, Mark Lord");
267MODULE_DESCRIPTION("low-level driver for the NS/AMD SC1200");
268MODULE_LICENSE("GPL");
269MODULE_DEVICE_TABLE(pci, sc1200);
270MODULE_VERSION(DRV_VERSION);
271

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