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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * pata_sch.c - Intel SCH PATA controllers
4 *
5 * Copyright (c) 2008 Alek Du <alek.du@intel.com>
6 */
7
8/*
9 * Supports:
10 * Intel SCH (AF82US15W, AF82US15L, AF82UL11L) chipsets -- see spec at:
11 * http://download.intel.com/design/chipsets/embedded/datashts/319537.pdf
12 */
13
14#include <linux/kernel.h>
15#include <linux/module.h>
16#include <linux/pci.h>
17#include <linux/blkdev.h>
18#include <linux/delay.h>
19#include <linux/device.h>
20#include <scsi/scsi_host.h>
21#include <linux/libata.h>
22#include <linux/dmi.h>
23
24#define DRV_NAME "pata_sch"
25#define DRV_VERSION "0.2"
26
27/* see SCH datasheet page 351 */
28enum {
29 D0TIM = 0x80, /* Device 0 Timing Register */
30 D1TIM = 0x84, /* Device 1 Timing Register */
31 PM = 0x07, /* PIO Mode Bit Mask */
32 MDM = (0x03 << 8), /* Multi-word DMA Mode Bit Mask */
33 UDM = (0x07 << 16), /* Ultra DMA Mode Bit Mask */
34 PPE = (1 << 30), /* Prefetch/Post Enable */
35 USD = (1 << 31), /* Use Synchronous DMA */
36};
37
38static int sch_init_one(struct pci_dev *pdev,
39 const struct pci_device_id *ent);
40static void sch_set_piomode(struct ata_port *ap, struct ata_device *adev);
41static void sch_set_dmamode(struct ata_port *ap, struct ata_device *adev);
42
43static const struct pci_device_id sch_pci_tbl[] = {
44 /* Intel SCH PATA Controller */
45 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_SCH_IDE), 0 },
46 { } /* terminate list */
47};
48
49static struct pci_driver sch_pci_driver = {
50 .name = DRV_NAME,
51 .id_table = sch_pci_tbl,
52 .probe = sch_init_one,
53 .remove = ata_pci_remove_one,
54#ifdef CONFIG_PM_SLEEP
55 .suspend = ata_pci_device_suspend,
56 .resume = ata_pci_device_resume,
57#endif
58};
59
60static const struct scsi_host_template sch_sht = {
61 ATA_BMDMA_SHT(DRV_NAME),
62};
63
64static struct ata_port_operations sch_pata_ops = {
65 .inherits = &ata_bmdma_port_ops,
66 .cable_detect = ata_cable_unknown,
67 .set_piomode = sch_set_piomode,
68 .set_dmamode = sch_set_dmamode,
69};
70
71static const struct ata_port_info sch_port_info = {
72 .flags = ATA_FLAG_SLAVE_POSS,
73 .pio_mask = ATA_PIO4,
74 .mwdma_mask = ATA_MWDMA2,
75 .udma_mask = ATA_UDMA5,
76 .port_ops = &sch_pata_ops,
77};
78
79MODULE_AUTHOR("Alek Du <alek.du@intel.com>");
80MODULE_DESCRIPTION("SCSI low-level driver for Intel SCH PATA controllers");
81MODULE_LICENSE("GPL");
82MODULE_DEVICE_TABLE(pci, sch_pci_tbl);
83MODULE_VERSION(DRV_VERSION);
84
85/**
86 * sch_set_piomode - Initialize host controller PATA PIO timings
87 * @ap: Port whose timings we are configuring
88 * @adev: ATA device
89 *
90 * Set PIO mode for device, in host controller PCI config space.
91 *
92 * LOCKING:
93 * None (inherited from caller).
94 */
95
96static void sch_set_piomode(struct ata_port *ap, struct ata_device *adev)
97{
98 unsigned int pio = adev->pio_mode - XFER_PIO_0;
99 struct pci_dev *dev = to_pci_dev(ap->host->dev);
100 unsigned int port = adev->devno ? D1TIM : D0TIM;
101 unsigned int data;
102
103 pci_read_config_dword(dev, port, &data);
104 /* see SCH datasheet page 351 */
105 /* set PIO mode */
106 data &= ~(PM | PPE);
107 data |= pio;
108 /* enable PPE for block device */
109 if (adev->class == ATA_DEV_ATA)
110 data |= PPE;
111 pci_write_config_dword(dev, port, data);
112}
113
114/**
115 * sch_set_dmamode - Initialize host controller PATA DMA timings
116 * @ap: Port whose timings we are configuring
117 * @adev: ATA device
118 *
119 * Set MW/UDMA mode for device, in host controller PCI config space.
120 *
121 * LOCKING:
122 * None (inherited from caller).
123 */
124
125static void sch_set_dmamode(struct ata_port *ap, struct ata_device *adev)
126{
127 unsigned int dma_mode = adev->dma_mode;
128 struct pci_dev *dev = to_pci_dev(ap->host->dev);
129 unsigned int port = adev->devno ? D1TIM : D0TIM;
130 unsigned int data;
131
132 pci_read_config_dword(dev, port, &data);
133 /* see SCH datasheet page 351 */
134 if (dma_mode >= XFER_UDMA_0) {
135 /* enable Synchronous DMA mode */
136 data |= USD;
137 data &= ~UDM;
138 data |= (dma_mode - XFER_UDMA_0) << 16;
139 } else { /* must be MWDMA mode, since we masked SWDMA already */
140 data &= ~(USD | MDM);
141 data |= (dma_mode - XFER_MW_DMA_0) << 8;
142 }
143 pci_write_config_dword(dev, port, data);
144}
145
146/**
147 * sch_init_one - Register SCH ATA PCI device with kernel services
148 * @pdev: PCI device to register
149 * @ent: Entry in sch_pci_tbl matching with @pdev
150 *
151 * LOCKING:
152 * Inherited from PCI layer (may sleep).
153 *
154 * RETURNS:
155 * Zero on success, or -ERRNO value.
156 */
157
158static int sch_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
159{
160 const struct ata_port_info *ppi[] = { &sch_port_info, NULL };
161
162 ata_print_version_once(&pdev->dev, DRV_VERSION);
163
164 return ata_pci_bmdma_init_one(pdev, ppi, &sch_sht, NULL, 0);
165}
166
167module_pci_driver(sch_pci_driver);
1/*
2 * pata_sch.c - Intel SCH PATA controllers
3 *
4 * Copyright (c) 2008 Alek Du <alek.du@intel.com>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License 2 as published
8 * by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; see the file COPYING. If not, write to
17 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
18 *
19 */
20
21/*
22 * Supports:
23 * Intel SCH (AF82US15W, AF82US15L, AF82UL11L) chipsets -- see spec at:
24 * http://download.intel.com/design/chipsets/embedded/datashts/319537.pdf
25 */
26
27#include <linux/kernel.h>
28#include <linux/module.h>
29#include <linux/pci.h>
30#include <linux/blkdev.h>
31#include <linux/delay.h>
32#include <linux/device.h>
33#include <scsi/scsi_host.h>
34#include <linux/libata.h>
35#include <linux/dmi.h>
36
37#define DRV_NAME "pata_sch"
38#define DRV_VERSION "0.2"
39
40/* see SCH datasheet page 351 */
41enum {
42 D0TIM = 0x80, /* Device 0 Timing Register */
43 D1TIM = 0x84, /* Device 1 Timing Register */
44 PM = 0x07, /* PIO Mode Bit Mask */
45 MDM = (0x03 << 8), /* Multi-word DMA Mode Bit Mask */
46 UDM = (0x07 << 16), /* Ultra DMA Mode Bit Mask */
47 PPE = (1 << 30), /* Prefetch/Post Enable */
48 USD = (1 << 31), /* Use Synchronous DMA */
49};
50
51static int sch_init_one(struct pci_dev *pdev,
52 const struct pci_device_id *ent);
53static void sch_set_piomode(struct ata_port *ap, struct ata_device *adev);
54static void sch_set_dmamode(struct ata_port *ap, struct ata_device *adev);
55
56static const struct pci_device_id sch_pci_tbl[] = {
57 /* Intel SCH PATA Controller */
58 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_SCH_IDE), 0 },
59 { } /* terminate list */
60};
61
62static struct pci_driver sch_pci_driver = {
63 .name = DRV_NAME,
64 .id_table = sch_pci_tbl,
65 .probe = sch_init_one,
66 .remove = ata_pci_remove_one,
67#ifdef CONFIG_PM
68 .suspend = ata_pci_device_suspend,
69 .resume = ata_pci_device_resume,
70#endif
71};
72
73static struct scsi_host_template sch_sht = {
74 ATA_BMDMA_SHT(DRV_NAME),
75};
76
77static struct ata_port_operations sch_pata_ops = {
78 .inherits = &ata_bmdma_port_ops,
79 .cable_detect = ata_cable_unknown,
80 .set_piomode = sch_set_piomode,
81 .set_dmamode = sch_set_dmamode,
82};
83
84static struct ata_port_info sch_port_info = {
85 .flags = ATA_FLAG_SLAVE_POSS,
86 .pio_mask = ATA_PIO4,
87 .mwdma_mask = ATA_MWDMA2,
88 .udma_mask = ATA_UDMA5,
89 .port_ops = &sch_pata_ops,
90};
91
92MODULE_AUTHOR("Alek Du <alek.du@intel.com>");
93MODULE_DESCRIPTION("SCSI low-level driver for Intel SCH PATA controllers");
94MODULE_LICENSE("GPL");
95MODULE_DEVICE_TABLE(pci, sch_pci_tbl);
96MODULE_VERSION(DRV_VERSION);
97
98/**
99 * sch_set_piomode - Initialize host controller PATA PIO timings
100 * @ap: Port whose timings we are configuring
101 * @adev: ATA device
102 *
103 * Set PIO mode for device, in host controller PCI config space.
104 *
105 * LOCKING:
106 * None (inherited from caller).
107 */
108
109static void sch_set_piomode(struct ata_port *ap, struct ata_device *adev)
110{
111 unsigned int pio = adev->pio_mode - XFER_PIO_0;
112 struct pci_dev *dev = to_pci_dev(ap->host->dev);
113 unsigned int port = adev->devno ? D1TIM : D0TIM;
114 unsigned int data;
115
116 pci_read_config_dword(dev, port, &data);
117 /* see SCH datasheet page 351 */
118 /* set PIO mode */
119 data &= ~(PM | PPE);
120 data |= pio;
121 /* enable PPE for block device */
122 if (adev->class == ATA_DEV_ATA)
123 data |= PPE;
124 pci_write_config_dword(dev, port, data);
125}
126
127/**
128 * sch_set_dmamode - Initialize host controller PATA DMA timings
129 * @ap: Port whose timings we are configuring
130 * @adev: ATA device
131 *
132 * Set MW/UDMA mode for device, in host controller PCI config space.
133 *
134 * LOCKING:
135 * None (inherited from caller).
136 */
137
138static void sch_set_dmamode(struct ata_port *ap, struct ata_device *adev)
139{
140 unsigned int dma_mode = adev->dma_mode;
141 struct pci_dev *dev = to_pci_dev(ap->host->dev);
142 unsigned int port = adev->devno ? D1TIM : D0TIM;
143 unsigned int data;
144
145 pci_read_config_dword(dev, port, &data);
146 /* see SCH datasheet page 351 */
147 if (dma_mode >= XFER_UDMA_0) {
148 /* enable Synchronous DMA mode */
149 data |= USD;
150 data &= ~UDM;
151 data |= (dma_mode - XFER_UDMA_0) << 16;
152 } else { /* must be MWDMA mode, since we masked SWDMA already */
153 data &= ~(USD | MDM);
154 data |= (dma_mode - XFER_MW_DMA_0) << 8;
155 }
156 pci_write_config_dword(dev, port, data);
157}
158
159/**
160 * sch_init_one - Register SCH ATA PCI device with kernel services
161 * @pdev: PCI device to register
162 * @ent: Entry in sch_pci_tbl matching with @pdev
163 *
164 * LOCKING:
165 * Inherited from PCI layer (may sleep).
166 *
167 * RETURNS:
168 * Zero on success, or -ERRNO value.
169 */
170
171static int sch_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
172{
173 const struct ata_port_info *ppi[] = { &sch_port_info, NULL };
174
175 ata_print_version_once(&pdev->dev, DRV_VERSION);
176
177 return ata_pci_bmdma_init_one(pdev, ppi, &sch_sht, NULL, 0);
178}
179
180module_pci_driver(sch_pci_driver);