Root/target/linux/adm5120/files/arch/mips/pci/pci-adm5120.c

1/*
2 * ADM5120 PCI Host Controller driver
3 *
4 * Copyright (C) 2007-2008 Gabor Juhos <juhosg@openwrt.org>
5 *
6 * This code was based on the ADM5120 specific port of the Linux 2.6.10 kernel
7 * done by Jeroen Vreeken
8 * Copyright (C) 2005 Jeroen Vreeken (pe1rxq@amsat.org)
9 *
10 * Jeroen's code was based on the Linux 2.4.xx source codes found in various
11 * tarballs released by Edimax for it's ADM5120 based devices
12 * Copyright (C) ADMtek Incorporated
13 *
14 * This program is free software; you can redistribute it and/or modify it
15 * under the terms of the GNU General Public License version 2 as published
16 * by the Free Software Foundation.
17 *
18 */
19#include <linux/types.h>
20#include <linux/kernel.h>
21#include <linux/init.h>
22#include <linux/spinlock.h>
23#include <linux/io.h>
24
25#include <linux/pci.h>
26#include <linux/pci_ids.h>
27#include <linux/pci_regs.h>
28
29#include <asm/delay.h>
30#include <asm/bootinfo.h>
31
32#include <asm/mach-adm5120/adm5120_defs.h>
33#include <asm/mach-adm5120/adm5120_info.h>
34#include <asm/mach-adm5120/adm5120_defs.h>
35#include <asm/mach-adm5120/adm5120_platform.h>
36
37#undef DEBUG
38
39#ifdef DEBUG
40#define DBG(f, a...) printk(KERN_DEBUG f, ## a)
41#else
42#define DBG(f, a...) do {} while (0)
43#endif
44
45#define PCI_ENABLE 0x80000000
46
47/* -------------------------------------------------------------------------*/
48
49static unsigned int adm5120_pci_nr_irqs __initdata;
50static struct adm5120_pci_irq *adm5120_pci_irq_map __initdata;
51
52static spinlock_t pci_lock = SPIN_LOCK_UNLOCKED;
53
54/* -------------------------------------------------------------------------*/
55
56static inline void write_cfgaddr(u32 addr)
57{
58    __raw_writel((addr | PCI_ENABLE),
59        (void __iomem *)(KSEG1ADDR(ADM5120_PCICFG_ADDR)));
60}
61
62static inline void write_cfgdata(u32 data)
63{
64    __raw_writel(data, (void __iomem *)KSEG1ADDR(ADM5120_PCICFG_DATA));
65}
66
67static inline u32 read_cfgdata(void)
68{
69    return __raw_readl((void __iomem *)KSEG1ADDR(ADM5120_PCICFG_DATA));
70}
71
72static inline u32 mkaddr(struct pci_bus *bus, unsigned int devfn, int where)
73{
74    return (((bus->number & 0xFF) << 16) | ((devfn & 0xFF) << 8) | \
75        (where & 0xFC));
76}
77
78/* -------------------------------------------------------------------------*/
79
80static int pci_config_read(struct pci_bus *bus, unsigned int devfn, int where,
81        int size, u32 *val)
82{
83    unsigned long flags;
84    u32 data;
85
86    spin_lock_irqsave(&pci_lock, flags);
87
88    write_cfgaddr(mkaddr(bus, devfn, where));
89    data = read_cfgdata();
90
91    DBG("PCI: cfg_read %02u.%02u.%01u/%02X:%01d, cfg:0x%08X",
92        bus->number, PCI_SLOT(devfn), PCI_FUNC(devfn),
93        where, size, data);
94
95    switch (size) {
96    case 1:
97        if (where & 1)
98            data >>= 8;
99        if (where & 2)
100            data >>= 16;
101        data &= 0xFF;
102        break;
103    case 2:
104        if (where & 2)
105            data >>= 16;
106        data &= 0xFFFF;
107        break;
108    }
109
110    *val = data;
111    DBG(", 0x%08X returned\n", data);
112
113    spin_unlock_irqrestore(&pci_lock, flags);
114
115    return PCIBIOS_SUCCESSFUL;
116}
117
118static int pci_config_write(struct pci_bus *bus, unsigned int devfn, int where,
119        int size, u32 val)
120{
121    unsigned long flags;
122    u32 data;
123    int s;
124
125    spin_lock_irqsave(&pci_lock, flags);
126
127    write_cfgaddr(mkaddr(bus, devfn, where));
128    data = read_cfgdata();
129
130    DBG("PCI: cfg_write %02u.%02u.%01u/%02X:%01d, cfg:0x%08X",
131        bus->number, PCI_SLOT(devfn), PCI_FUNC(devfn),
132        where, size, data);
133
134    switch (size) {
135    case 1:
136        s = ((where & 3) << 3);
137        data &= ~(0xFF << s);
138        data |= ((val & 0xFF) << s);
139        break;
140    case 2:
141        s = ((where & 2) << 4);
142        data &= ~(0xFFFF << s);
143        data |= ((val & 0xFFFF) << s);
144        break;
145    case 4:
146        data = val;
147        break;
148    }
149
150    write_cfgdata(data);
151    DBG(", 0x%08X written\n", data);
152
153    spin_unlock_irqrestore(&pci_lock, flags);
154
155    return PCIBIOS_SUCCESSFUL;
156}
157
158struct pci_ops adm5120_pci_ops = {
159    .read = pci_config_read,
160    .write = pci_config_write,
161};
162
163/* -------------------------------------------------------------------------*/
164
165static void adm5120_pci_fixup(struct pci_dev *dev)
166{
167    if (dev->devfn != 0)
168        return;
169
170    /* setup COMMAND register */
171    pci_write_config_word(dev, PCI_COMMAND,
172        (PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER));
173
174    /* setup CACHE_LINE_SIZE register */
175    pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, 4);
176
177    /* setup BARS */
178    pci_write_config_dword(dev, PCI_BASE_ADDRESS_0, 0);
179    pci_write_config_dword(dev, PCI_BASE_ADDRESS_1, 0);
180}
181
182DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_ADMTEK, PCI_DEVICE_ID_ADMTEK_ADM5120,
183    adm5120_pci_fixup);
184
185/* -------------------------------------------------------------------------*/
186
187void __init adm5120_pci_set_irq_map(unsigned int nr_irqs,
188        struct adm5120_pci_irq *map)
189{
190    adm5120_pci_nr_irqs = nr_irqs;
191    adm5120_pci_irq_map = map;
192}
193
194int __init pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
195{
196    int irq = -1;
197    int i;
198
199    if ((!adm5120_pci_nr_irqs) || (!adm5120_pci_irq_map)) {
200        printk(KERN_ALERT "PCI: pci_irq_map is not initialized\n");
201        goto out;
202    }
203
204    if (slot < 1 || slot > 3) {
205        printk(KERN_ALERT "PCI: slot number %u is not supported\n",
206            slot);
207        goto out;
208    }
209
210    for (i = 0; i < adm5120_pci_nr_irqs; i++) {
211        if ((adm5120_pci_irq_map[i].slot == slot)
212            && (adm5120_pci_irq_map[i].func == PCI_FUNC(dev->devfn))
213            && (adm5120_pci_irq_map[i].pin == pin)) {
214            irq = adm5120_pci_irq_map[i].irq;
215            break;
216        }
217    }
218
219    if (irq < 0) {
220        printk(KERN_ALERT "PCI: no irq found for %s pin:%u\n",
221            pci_name((struct pci_dev *)dev), pin);
222    } else {
223        printk(KERN_INFO "PCI: mapping irq for %s pin:%u, irq:%d\n",
224            pci_name((struct pci_dev *)dev), pin, irq);
225    }
226
227out:
228    return irq;
229}
230
231int pcibios_plat_dev_init(struct pci_dev *dev)
232{
233    return 0;
234}
235
236/* -------------------------------------------------------------------------*/
237
238static struct resource pci_io_resource = {
239    .name = "ADM5120 PCI I/O",
240    .start = ADM5120_PCIIO_BASE,
241    .end = ADM5120_PCICFG_ADDR-1,
242    .flags = IORESOURCE_IO
243};
244
245static struct resource pci_mem_resource = {
246    .name = "ADM5120 PCI MEM",
247    .start = ADM5120_PCIMEM_BASE,
248    .end = ADM5120_PCIIO_BASE-1,
249    .flags = IORESOURCE_MEM
250};
251
252static struct pci_controller adm5120_controller = {
253    .pci_ops = &adm5120_pci_ops,
254    .io_resource = &pci_io_resource,
255    .mem_resource = &pci_mem_resource,
256};
257
258static int __init adm5120_pci_setup(void)
259{
260    if (adm5120_package_pqfp()) {
261        printk(KERN_INFO "PCI: not available on ADM5120P\n");
262        return -1;
263    }
264
265    /* Avoid ISA compat ranges. */
266    PCIBIOS_MIN_IO = 0x00000000;
267    PCIBIOS_MIN_MEM = 0x00000000;
268
269    /* Set I/O resource limits. */
270    ioport_resource.end = 0x1fffffff;
271    iomem_resource.end = 0xffffffff;
272
273    register_pci_controller(&adm5120_controller);
274    return 0;
275}
276
277arch_initcall(adm5120_pci_setup);
278

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