1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * pata-cs5535.c - CS5535 PATA for new ATA layer
4 * (C) 2005-2006 Red Hat Inc
5 * Alan Cox <alan@lxorguk.ukuu.org.uk>
6 *
7 * based upon cs5535.c from AMD <Jens.Altmann@amd.com> as cleaned up and
8 * made readable and Linux style by Wolfgang Zuleger <wolfgang.zuleger@gmx.de>
9 * and Alexander Kiausch <alex.kiausch@t-online.de>
10 *
11 * Loosely based on the piix & svwks drivers.
12 *
13 * Documentation:
14 * Available from AMD web site.
15 * TODO
16 * Review errata to see if serializing is necessary
17 */
18
19 #include <linux/kernel.h>
20 #include <linux/module.h>
21 #include <linux/pci.h>
22 #include <linux/blkdev.h>
23 #include <linux/delay.h>
24 #include <scsi/scsi_host.h>
25 #include <linux/libata.h>
26 #include <asm/msr.h>
27
28 #define DRV_NAME "pata_cs5535"
29 #define DRV_VERSION "0.2.12"
30
31 /*
32 * The Geode (Aka Athlon GX now) uses an internal MSR based
33 * bus system for control. Demented but there you go.
34 */
35
36 #define MSR_ATAC_BASE 0x51300000
37 #define ATAC_GLD_MSR_CAP (MSR_ATAC_BASE+0)
38 #define ATAC_GLD_MSR_CONFIG (MSR_ATAC_BASE+0x01)
39 #define ATAC_GLD_MSR_SMI (MSR_ATAC_BASE+0x02)
40 #define ATAC_GLD_MSR_ERROR (MSR_ATAC_BASE+0x03)
41 #define ATAC_GLD_MSR_PM (MSR_ATAC_BASE+0x04)
42 #define ATAC_GLD_MSR_DIAG (MSR_ATAC_BASE+0x05)
43 #define ATAC_IO_BAR (MSR_ATAC_BASE+0x08)
44 #define ATAC_RESET (MSR_ATAC_BASE+0x10)
45 #define ATAC_CH0D0_PIO (MSR_ATAC_BASE+0x20)
46 #define ATAC_CH0D0_DMA (MSR_ATAC_BASE+0x21)
47 #define ATAC_CH0D1_PIO (MSR_ATAC_BASE+0x22)
48 #define ATAC_CH0D1_DMA (MSR_ATAC_BASE+0x23)
49 #define ATAC_PCI_ABRTERR (MSR_ATAC_BASE+0x24)
50
51 #define ATAC_BM0_CMD_PRIM 0x00
52 #define ATAC_BM0_STS_PRIM 0x02
53 #define ATAC_BM0_PRD 0x04
54
55 #define CS5535_CABLE_DETECT 0x48
56
57 /**
58 * cs5535_cable_detect - detect cable type
59 * @ap: Port to detect on
60 *
61 * Perform cable detection for ATA66 capable cable. Return a libata
62 * cable type.
63 */
64
cs5535_cable_detect(struct ata_port * ap)65 static int cs5535_cable_detect(struct ata_port *ap)
66 {
67 u8 cable;
68 struct pci_dev *pdev = to_pci_dev(ap->host->dev);
69
70 pci_read_config_byte(pdev, CS5535_CABLE_DETECT, &cable);
71 if (cable & 1)
72 return ATA_CBL_PATA80;
73 else
74 return ATA_CBL_PATA40;
75 }
76
77 /**
78 * cs5535_set_piomode - PIO setup
79 * @ap: ATA interface
80 * @adev: device on the interface
81 *
82 * Set our PIO requirements. The CS5535 is pretty clean about all this
83 */
84
cs5535_set_piomode(struct ata_port * ap,struct ata_device * adev)85 static void cs5535_set_piomode(struct ata_port *ap, struct ata_device *adev)
86 {
87 static const u16 pio_timings[5] = {
88 0xF7F4, 0xF173, 0x8141, 0x5131, 0x1131
89 };
90 static const u16 pio_cmd_timings[5] = {
91 0xF7F4, 0x53F3, 0x13F1, 0x5131, 0x1131
92 };
93 u32 reg, __maybe_unused dummy;
94 struct ata_device *pair = ata_dev_pair(adev);
95
96 int mode = adev->pio_mode - XFER_PIO_0;
97 int cmdmode = mode;
98
99 /* Command timing has to be for the lowest of the pair of devices */
100 if (pair) {
101 int pairmode = pair->pio_mode - XFER_PIO_0;
102 cmdmode = min(mode, pairmode);
103 /* Write the other drive timing register if it changed */
104 if (cmdmode < pairmode)
105 wrmsr(ATAC_CH0D0_PIO + 2 * pair->devno,
106 pio_cmd_timings[cmdmode] << 16 | pio_timings[pairmode], 0);
107 }
108 /* Write the drive timing register */
109 wrmsr(ATAC_CH0D0_PIO + 2 * adev->devno,
110 pio_cmd_timings[cmdmode] << 16 | pio_timings[mode], 0);
111
112 /* Set the PIO "format 1" bit in the DMA timing register */
113 rdmsr(ATAC_CH0D0_DMA + 2 * adev->devno, reg, dummy);
114 wrmsr(ATAC_CH0D0_DMA + 2 * adev->devno, reg | 0x80000000UL, 0);
115 }
116
117 /**
118 * cs5535_set_dmamode - DMA timing setup
119 * @ap: ATA interface
120 * @adev: Device being configured
121 *
122 */
123
cs5535_set_dmamode(struct ata_port * ap,struct ata_device * adev)124 static void cs5535_set_dmamode(struct ata_port *ap, struct ata_device *adev)
125 {
126 static const u32 udma_timings[5] = {
127 0x7F7436A1, 0x7F733481, 0x7F723261, 0x7F713161, 0x7F703061
128 };
129 static const u32 mwdma_timings[3] = {
130 0x7F0FFFF3, 0x7F035352, 0x7F024241
131 };
132 u32 reg, __maybe_unused dummy;
133 int mode = adev->dma_mode;
134
135 rdmsr(ATAC_CH0D0_DMA + 2 * adev->devno, reg, dummy);
136 reg &= 0x80000000UL;
137 if (mode >= XFER_UDMA_0)
138 reg |= udma_timings[mode - XFER_UDMA_0];
139 else
140 reg |= mwdma_timings[mode - XFER_MW_DMA_0];
141 wrmsr(ATAC_CH0D0_DMA + 2 * adev->devno, reg, 0);
142 }
143
144 static const struct scsi_host_template cs5535_sht = {
145 ATA_BMDMA_SHT(DRV_NAME),
146 };
147
148 static struct ata_port_operations cs5535_port_ops = {
149 .inherits = &ata_bmdma_port_ops,
150 .cable_detect = cs5535_cable_detect,
151 .set_piomode = cs5535_set_piomode,
152 .set_dmamode = cs5535_set_dmamode,
153 };
154
155 /**
156 * cs5535_init_one - Initialise a CS5530
157 * @dev: PCI device
158 * @id: Entry in match table
159 *
160 * Install a driver for the newly found CS5530 companion chip. Most of
161 * this is just housekeeping. We have to set the chip up correctly and
162 * turn off various bits of emulation magic.
163 */
164
cs5535_init_one(struct pci_dev * dev,const struct pci_device_id * id)165 static int cs5535_init_one(struct pci_dev *dev, const struct pci_device_id *id)
166 {
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_UDMA4,
172 .port_ops = &cs5535_port_ops
173 };
174 const struct ata_port_info *ppi[] = { &info, &ata_dummy_port_info };
175
176 return ata_pci_bmdma_init_one(dev, ppi, &cs5535_sht, NULL, 0);
177 }
178
179 static const struct pci_device_id cs5535[] = {
180 { PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_CS5535_IDE), },
181 { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_CS5535_IDE), },
182
183 { },
184 };
185
186 static struct pci_driver cs5535_pci_driver = {
187 .name = DRV_NAME,
188 .id_table = cs5535,
189 .probe = cs5535_init_one,
190 .remove = ata_pci_remove_one,
191 #ifdef CONFIG_PM_SLEEP
192 .suspend = ata_pci_device_suspend,
193 .resume = ata_pci_device_resume,
194 #endif
195 };
196
197 module_pci_driver(cs5535_pci_driver);
198
199 MODULE_AUTHOR("Alan Cox, Jens Altmann, Wolfgan Zuleger, Alexander Kiausch");
200 MODULE_DESCRIPTION("low-level driver for the NS/AMD 5535");
201 MODULE_LICENSE("GPL");
202 MODULE_DEVICE_TABLE(pci, cs5535);
203 MODULE_VERSION(DRV_VERSION);
204