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, where: port, val: &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, where: port, val: 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, where: port, val: &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, where: port, val: 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(dev: &pdev->dev, DRV_VERSION);
163
164 return ata_pci_bmdma_init_one(pdev, ppi, sht: &sch_sht, NULL, hflags: 0);
165}
166
167module_pci_driver(sch_pci_driver);
168