1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * pata_jmicron.c - JMicron ATA driver for non AHCI mode. This drives the
4 * PATA port of the controller. The SATA ports are
5 * driven by AHCI in the usual configuration although
6 * this driver can handle other setups if we need it.
7 *
8 * (c) 2006 Red Hat
9 */
10
11 #include <linux/kernel.h>
12 #include <linux/module.h>
13 #include <linux/pci.h>
14 #include <linux/blkdev.h>
15 #include <linux/delay.h>
16 #include <linux/device.h>
17 #include <scsi/scsi_host.h>
18 #include <linux/libata.h>
19 #include <linux/ata.h>
20
21 #define DRV_NAME "pata_jmicron"
22 #define DRV_VERSION "0.1.5"
23
24 typedef enum {
25 PORT_PATA0 = 0,
26 PORT_PATA1 = 1,
27 PORT_SATA = 2,
28 } port_type;
29
30 /**
31 * jmicron_pre_reset - check for 40/80 pin
32 * @link: ATA link
33 * @deadline: deadline jiffies for the operation
34 *
35 * Perform the PATA port setup we need.
36 *
37 * On the Jmicron 361/363 there is a single PATA port that can be mapped
38 * either as primary or secondary (or neither). We don't do any policy
39 * and setup here. We assume that has been done by init_one and the
40 * BIOS.
41 */
jmicron_pre_reset(struct ata_link * link,unsigned long deadline)42 static int jmicron_pre_reset(struct ata_link *link, unsigned long deadline)
43 {
44 struct ata_port *ap = link->ap;
45 struct pci_dev *pdev = to_pci_dev(ap->host->dev);
46 u32 control;
47 u32 control5;
48 int port_mask = 1<< (4 * ap->port_no);
49 int port = ap->port_no;
50 port_type port_map[2];
51
52 /* Check if our port is enabled */
53 pci_read_config_dword(pdev, 0x40, &control);
54 if ((control & port_mask) == 0)
55 return -ENOENT;
56
57 /* There are two basic mappings. One has the two SATA ports merged
58 as master/slave and the secondary as PATA, the other has only the
59 SATA port mapped */
60 if (control & (1 << 23)) {
61 port_map[0] = PORT_SATA;
62 port_map[1] = PORT_PATA0;
63 } else {
64 port_map[0] = PORT_SATA;
65 port_map[1] = PORT_SATA;
66 }
67
68 /* The 365/366 may have this bit set to map the second PATA port
69 as the internal primary channel */
70 pci_read_config_dword(pdev, 0x80, &control5);
71 if (control5 & (1<<24))
72 port_map[0] = PORT_PATA1;
73
74 /* The two ports may then be logically swapped by the firmware */
75 if (control & (1 << 22))
76 port = port ^ 1;
77
78 /*
79 * Now we know which physical port we are talking about we can
80 * actually do our cable checking etc. Thankfully we don't need
81 * to do the plumbing for other cases.
82 */
83 switch (port_map[port]) {
84 case PORT_PATA0:
85 if ((control & (1 << 5)) == 0)
86 return -ENOENT;
87 if (control & (1 << 3)) /* 40/80 pin primary */
88 ap->cbl = ATA_CBL_PATA40;
89 else
90 ap->cbl = ATA_CBL_PATA80;
91 break;
92 case PORT_PATA1:
93 /* Bit 21 is set if the port is enabled */
94 if ((control5 & (1 << 21)) == 0)
95 return -ENOENT;
96 if (control5 & (1 << 19)) /* 40/80 pin secondary */
97 ap->cbl = ATA_CBL_PATA40;
98 else
99 ap->cbl = ATA_CBL_PATA80;
100 break;
101 case PORT_SATA:
102 ap->cbl = ATA_CBL_SATA;
103 break;
104 }
105 return ata_sff_prereset(link, deadline);
106 }
107
108 /* No PIO or DMA methods needed for this device */
109
110 static struct scsi_host_template jmicron_sht = {
111 ATA_BMDMA_SHT(DRV_NAME),
112 };
113
114 static struct ata_port_operations jmicron_ops = {
115 .inherits = &ata_bmdma_port_ops,
116 .prereset = jmicron_pre_reset,
117 };
118
119
120 /**
121 * jmicron_init_one - Register Jmicron ATA PCI device with kernel services
122 * @pdev: PCI device to register
123 * @ent: Entry in jmicron_pci_tbl matching with @pdev
124 *
125 * Called from kernel PCI layer.
126 *
127 * LOCKING:
128 * Inherited from PCI layer (may sleep).
129 *
130 * RETURNS:
131 * Zero on success, or -ERRNO value.
132 */
133
jmicron_init_one(struct pci_dev * pdev,const struct pci_device_id * id)134 static int jmicron_init_one (struct pci_dev *pdev, const struct pci_device_id *id)
135 {
136 static const struct ata_port_info info = {
137 .flags = ATA_FLAG_SLAVE_POSS,
138
139 .pio_mask = ATA_PIO4,
140 .mwdma_mask = ATA_MWDMA2,
141 .udma_mask = ATA_UDMA5,
142
143 .port_ops = &jmicron_ops,
144 };
145 const struct ata_port_info *ppi[] = { &info, NULL };
146
147 return ata_pci_bmdma_init_one(pdev, ppi, &jmicron_sht, NULL, 0);
148 }
149
150 static const struct pci_device_id jmicron_pci_tbl[] = {
151 { PCI_VENDOR_ID_JMICRON, PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID,
152 PCI_CLASS_STORAGE_IDE << 8, 0xffff00, 0 },
153 { } /* terminate list */
154 };
155
156 static struct pci_driver jmicron_pci_driver = {
157 .name = DRV_NAME,
158 .id_table = jmicron_pci_tbl,
159 .probe = jmicron_init_one,
160 .remove = ata_pci_remove_one,
161 #ifdef CONFIG_PM_SLEEP
162 .suspend = ata_pci_device_suspend,
163 .resume = ata_pci_device_resume,
164 #endif
165 };
166
167 module_pci_driver(jmicron_pci_driver);
168
169 MODULE_AUTHOR("Alan Cox");
170 MODULE_DESCRIPTION("SCSI low-level driver for Jmicron PATA ports");
171 MODULE_LICENSE("GPL");
172 MODULE_DEVICE_TABLE(pci, jmicron_pci_tbl);
173 MODULE_VERSION(DRV_VERSION);
174
175
