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