1/*
2 * BIOS Flash chip on Intel 440GX board.
3 *
4 * Bugs this currently does not work under linuxBIOS.
5 */
6
7#include <linux/module.h>
8#include <linux/pci.h>
9#include <linux/kernel.h>
10#include <linux/init.h>
11#include <asm/io.h>
12#include <linux/mtd/mtd.h>
13#include <linux/mtd/map.h>
14
15#define PIIXE_IOBASE_RESOURCE	11
16
17#define WINDOW_ADDR 0xfff00000
18#define WINDOW_SIZE 0x00100000
19#define BUSWIDTH 1
20
21static u32 iobase;
22#define IOBASE iobase
23#define TRIBUF_PORT (IOBASE+0x37)
24#define VPP_PORT (IOBASE+0x28)
25
26static struct mtd_info *mymtd;
27
28
29/* Is this really the vpp port? */
30static DEFINE_SPINLOCK(l440gx_vpp_lock);
31static int l440gx_vpp_refcnt;
32static void l440gx_set_vpp(struct map_info *map, int vpp)
33{
34	unsigned long flags;
35
36	spin_lock_irqsave(&l440gx_vpp_lock, flags);
37	if (vpp) {
38		if (++l440gx_vpp_refcnt == 1)   /* first nested 'on' */
39			outl(inl(VPP_PORT) | 1, VPP_PORT);
40	} else {
41		if (--l440gx_vpp_refcnt == 0)   /* last nested 'off' */
42			outl(inl(VPP_PORT) & ~1, VPP_PORT);
43	}
44	spin_unlock_irqrestore(&l440gx_vpp_lock, flags);
45}
46
47static struct map_info l440gx_map = {
48	.name = "L440GX BIOS",
49	.size = WINDOW_SIZE,
50	.bankwidth = BUSWIDTH,
51	.phys = WINDOW_ADDR,
52#if 0
53	/* FIXME verify that this is the
54	 * appripriate code for vpp enable/disable
55	 */
56	.set_vpp = l440gx_set_vpp
57#endif
58};
59
60static int __init init_l440gx(void)
61{
62	struct pci_dev *dev, *pm_dev;
63	struct resource *pm_iobase;
64	__u16 word;
65
66	dev = pci_get_device(PCI_VENDOR_ID_INTEL,
67		PCI_DEVICE_ID_INTEL_82371AB_0, NULL);
68
69	pm_dev = pci_get_device(PCI_VENDOR_ID_INTEL,
70		PCI_DEVICE_ID_INTEL_82371AB_3, NULL);
71
72	pci_dev_put(dev);
73
74	if (!dev || !pm_dev) {
75		printk(KERN_NOTICE "L440GX flash mapping: failed to find PIIX4 ISA bridge, cannot continue\n");
76		pci_dev_put(pm_dev);
77		return -ENODEV;
78	}
79
80	l440gx_map.virt = ioremap_nocache(WINDOW_ADDR, WINDOW_SIZE);
81
82	if (!l440gx_map.virt) {
83		printk(KERN_WARNING "Failed to ioremap L440GX flash region\n");
84		pci_dev_put(pm_dev);
85		return -ENOMEM;
86	}
87	simple_map_init(&l440gx_map);
88	printk(KERN_NOTICE "window_addr = 0x%08lx\n", (unsigned long)l440gx_map.virt);
89
90	/* Setup the pm iobase resource
91	 * This code should move into some kind of generic bridge
92	 * driver but for the moment I'm content with getting the
93	 * allocation correct.
94	 */
95	pm_iobase = &pm_dev->resource[PIIXE_IOBASE_RESOURCE];
96	if (!(pm_iobase->flags & IORESOURCE_IO)) {
97		pm_iobase->name = "pm iobase";
98		pm_iobase->start = 0;
99		pm_iobase->end = 63;
100		pm_iobase->flags = IORESOURCE_IO;
101
102		/* Put the current value in the resource */
103		pci_read_config_dword(pm_dev, 0x40, &iobase);
104		iobase &= ~1;
105		pm_iobase->start += iobase & ~1;
106		pm_iobase->end += iobase & ~1;
107
108		pci_dev_put(pm_dev);
109
110		/* Allocate the resource region */
111		if (pci_assign_resource(pm_dev, PIIXE_IOBASE_RESOURCE) != 0) {
112			pci_dev_put(dev);
113			pci_dev_put(pm_dev);
114			printk(KERN_WARNING "Could not allocate pm iobase resource\n");
115			iounmap(l440gx_map.virt);
116			return -ENXIO;
117		}
118	}
119	/* Set the iobase */
120	iobase = pm_iobase->start;
121	pci_write_config_dword(pm_dev, 0x40, iobase | 1);
122
123
124	/* Set XBCS# */
125	pci_read_config_word(dev, 0x4e, &word);
126	word |= 0x4;
127        pci_write_config_word(dev, 0x4e, word);
128
129	/* Supply write voltage to the chip */
130	l440gx_set_vpp(&l440gx_map, 1);
131
132	/* Enable the gate on the WE line */
133	outb(inb(TRIBUF_PORT) & ~1, TRIBUF_PORT);
134
135       	printk(KERN_NOTICE "Enabled WE line to L440GX BIOS flash chip.\n");
136
137	mymtd = do_map_probe("jedec_probe", &l440gx_map);
138	if (!mymtd) {
139		printk(KERN_NOTICE "JEDEC probe on BIOS chip failed. Using ROM\n");
140		mymtd = do_map_probe("map_rom", &l440gx_map);
141	}
142	if (mymtd) {
143		mymtd->owner = THIS_MODULE;
144
145		mtd_device_register(mymtd, NULL, 0);
146		return 0;
147	}
148
149	iounmap(l440gx_map.virt);
150	return -ENXIO;
151}
152
153static void __exit cleanup_l440gx(void)
154{
155	mtd_device_unregister(mymtd);
156	map_destroy(mymtd);
157
158	iounmap(l440gx_map.virt);
159}
160
161module_init(init_l440gx);
162module_exit(cleanup_l440gx);
163
164MODULE_LICENSE("GPL");
165MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
166MODULE_DESCRIPTION("MTD map driver for BIOS chips on Intel L440GX motherboards");
167