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/*
* ADM5120 PCI Host Controller driver
*
* Copyright (C) 2007-2008 Gabor Juhos <juhosg@openwrt.org>
*
* This code was based on the ADM5120 specific port of the Linux 2.6.10 kernel
* done by Jeroen Vreeken
* Copyright (C) 2005 Jeroen Vreeken (pe1rxq@amsat.org)
*
* Jeroen's code was based on the Linux 2.4.xx source codes found in various
* tarballs released by Edimax for it's ADM5120 based devices
* Copyright (C) ADMtek Incorporated
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation.
*
*/
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/spinlock.h>
#include <linux/io.h>
#include <linux/delay.h>
#include <linux/pci.h>
#include <linux/pci_ids.h>
#include <linux/pci_regs.h>
#include <asm/bootinfo.h>
#include <asm/mach-adm5120/adm5120_defs.h>
#include <asm/mach-adm5120/adm5120_info.h>
#include <asm/mach-adm5120/adm5120_defs.h>
#include <asm/mach-adm5120/adm5120_platform.h>
#undef DEBUG
#ifdef DEBUG
#define DBG(f, a...) printk(KERN_DEBUG f, ## a)
#else
#define DBG(f, a...) do {} while (0)
#endif
#define PCI_ENABLE 0x80000000
/* -------------------------------------------------------------------------*/
static unsigned int adm5120_pci_nr_irqs __initdata;
static struct adm5120_pci_irq *adm5120_pci_irq_map __initdata;
static DEFINE_SPINLOCK(pci_lock);
/* -------------------------------------------------------------------------*/
static inline void write_cfgaddr(u32 addr)
{
__raw_writel((addr | PCI_ENABLE),
(void __iomem *)(KSEG1ADDR(ADM5120_PCICFG_ADDR)));
}
static inline void write_cfgdata(u32 data)
{
__raw_writel(data, (void __iomem *)KSEG1ADDR(ADM5120_PCICFG_DATA));
}
static inline u32 read_cfgdata(void)
{
return __raw_readl((void __iomem *)KSEG1ADDR(ADM5120_PCICFG_DATA));
}
static inline u32 mkaddr(struct pci_bus *bus, unsigned int devfn, int where)
{
return ((bus->number & 0xFF) << 16) | ((devfn & 0xFF) << 8) | \
(where & 0xFC);
}
/* -------------------------------------------------------------------------*/
static int pci_config_read(struct pci_bus *bus, unsigned int devfn, int where,
int size, u32 *val)
{
unsigned long flags;
u32 data;
spin_lock_irqsave(&pci_lock, flags);
write_cfgaddr(mkaddr(bus, devfn, where));
data = read_cfgdata();
DBG("PCI: cfg_read %02u.%02u.%01u/%02X:%01d, cfg:0x%08X",
bus->number, PCI_SLOT(devfn), PCI_FUNC(devfn),
where, size, data);
switch (size) {
case 1:
if (where & 1)
data >>= 8;
if (where & 2)
data >>= 16;
data &= 0xFF;
break;
case 2:
if (where & 2)
data >>= 16;
data &= 0xFFFF;
break;
}
*val = data;
DBG(", 0x%08X returned\n", data);
spin_unlock_irqrestore(&pci_lock, flags);
return PCIBIOS_SUCCESSFUL;
}
static int pci_config_write(struct pci_bus *bus, unsigned int devfn, int where,
int size, u32 val)
{
unsigned long flags;
u32 data;
int s;
spin_lock_irqsave(&pci_lock, flags);
write_cfgaddr(mkaddr(bus, devfn, where));
data = read_cfgdata();
DBG("PCI: cfg_write %02u.%02u.%01u/%02X:%01d, cfg:0x%08X",
bus->number, PCI_SLOT(devfn), PCI_FUNC(devfn),
where, size, data);
switch (size) {
case 1:
s = ((where & 3) << 3);
data &= ~(0xFF << s);
data |= ((val & 0xFF) << s);
break;
case 2:
s = ((where & 2) << 4);
data &= ~(0xFFFF << s);
data |= ((val & 0xFFFF) << s);
break;
case 4:
data = val;
break;
}
write_cfgdata(data);
DBG(", 0x%08X written\n", data);
spin_unlock_irqrestore(&pci_lock, flags);
return PCIBIOS_SUCCESSFUL;
}
struct pci_ops adm5120_pci_ops = {
.read = pci_config_read,
.write = pci_config_write,
};
/* -------------------------------------------------------------------------*/
static void adm5120_pci_fixup(struct pci_dev *dev)
{
if (dev->devfn != 0)
return;
/* setup COMMAND register */
pci_write_config_word(dev, PCI_COMMAND,
(PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER));
/* setup CACHE_LINE_SIZE register */
pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, 4);
/* setup BARS */
pci_write_config_dword(dev, PCI_BASE_ADDRESS_0, 0);
pci_write_config_dword(dev, PCI_BASE_ADDRESS_1, 0);
}
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_ADMTEK, PCI_DEVICE_ID_ADMTEK_ADM5120,
adm5120_pci_fixup);
/* -------------------------------------------------------------------------*/
void __init adm5120_pci_set_irq_map(unsigned int nr_irqs,
struct adm5120_pci_irq *map)
{
adm5120_pci_nr_irqs = nr_irqs;
adm5120_pci_irq_map = map;
}
int __init pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
{
int irq = -1;
int i;
if ((!adm5120_pci_nr_irqs) || (!adm5120_pci_irq_map)) {
printk(KERN_ALERT "PCI: pci_irq_map is not initialized\n");
goto out;
}
if (slot < 1 || slot > 4) {
printk(KERN_ALERT "PCI: slot number %u is not supported\n",
slot);
goto out;
}
for (i = 0; i < adm5120_pci_nr_irqs; i++) {
if ((adm5120_pci_irq_map[i].slot == slot)
&& (adm5120_pci_irq_map[i].func == PCI_FUNC(dev->devfn))
&& (adm5120_pci_irq_map[i].pin == pin)) {
irq = adm5120_pci_irq_map[i].irq;
break;
}
}
if (irq < 0) {
printk(KERN_ALERT "PCI: no irq found for %s pin:%u\n",
pci_name((struct pci_dev *)dev), pin);
} else {
printk(KERN_INFO "PCI: mapping irq for %s pin:%u, irq:%d\n",
pci_name((struct pci_dev *)dev), pin, irq);
}
out:
return irq;
}
int pcibios_plat_dev_init(struct pci_dev *dev)
{
return 0;
}
/* -------------------------------------------------------------------------*/
static struct resource pci_io_resource = {
.name = "ADM5120 PCI I/O",
.start = ADM5120_PCIIO_BASE,
.end = ADM5120_PCICFG_ADDR-1,
.flags = IORESOURCE_IO
};
static struct resource pci_mem_resource = {
.name = "ADM5120 PCI MEM",
.start = ADM5120_PCIMEM_BASE,
.end = ADM5120_PCIIO_BASE-1,
.flags = IORESOURCE_MEM
};
static struct pci_controller adm5120_controller = {
.pci_ops = &adm5120_pci_ops,
.io_resource = &pci_io_resource,
.mem_resource = &pci_mem_resource,
};
static int __init adm5120_pci_setup(void)
{
if (adm5120_package_pqfp()) {
printk(KERN_INFO "PCI: not available on ADM5120P\n");
return -1;
}
/* Avoid ISA compat ranges. */
PCIBIOS_MIN_IO = 0x00000000;
PCIBIOS_MIN_MEM = 0x00000000;
/* Set I/O resource limits. */
ioport_resource.end = 0x1fffffff;
iomem_resource.end = 0xffffffff;
register_pci_controller(&adm5120_controller);
return 0;
}
arch_initcall(adm5120_pci_setup);
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