xref: /openbmc/linux/drivers/ata/pata_cs5535.c (revision 25df73d9)
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