// SPDX-License-Identifier: GPL-2.0-only
/*
* Ralink RT288x SoC PCI register definitions
*
* Copyright (C) 2009 John Crispin <john@phrozen.org>
* Copyright (C) 2009 Gabor Juhos <juhosg@openwrt.org>
*
* Parts of this file are based on Ralink's 2.6.21 BSP
*/
#include <linux/delay.h>
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/io.h>
#include <linux/init.h>
#include <linux/mod_devicetable.h>
#include <linux/platform_device.h>
#include <asm /mach-ralink/rt288x.h>
#define RT2880_PCI_BASE 0 x00440000
#define RT288X_CPU_IRQ_PCI 4
#define RT2880_PCI_MEM_BASE 0 x20000000
#define RT2880_PCI_MEM_SIZE 0 x10000000
#define RT2880_PCI_IO_BASE 0 x00460000
#define RT2880_PCI_IO_SIZE 0 x00010000
#define RT2880_PCI_REG_PCICFG_ADDR 0 x00
#define RT2880_PCI_REG_PCIMSK_ADDR 0 x0c
#define RT2880_PCI_REG_BAR0SETUP_ADDR 0 x10
#define RT2880_PCI_REG_IMBASEBAR0_ADDR 0 x18
#define RT2880_PCI_REG_CONFIG_ADDR 0 x20
#define RT2880_PCI_REG_CONFIG_DATA 0 x24
#define RT2880_PCI_REG_MEMBASE 0 x28
#define RT2880_PCI_REG_IOBASE 0 x2c
#define RT2880_PCI_REG_ID 0 x30
#define RT2880_PCI_REG_CLASS 0 x34
#define RT2880_PCI_REG_SUBID 0 x38
#define RT2880_PCI_REG_ARBCTL 0 x80
static void __iomem *rt2880_pci_base;
static u32 rt2880_pci_reg_read(u32 reg)
{
return readl(rt2880_pci_base + reg);
}
static void rt2880_pci_reg_write(u32 val, u32 reg)
{
writel(val, rt2880_pci_base + reg);
}
static inline u32 rt2880_pci_get_cfgaddr(unsigned int bus, unsigned int slot,
unsigned int func, unsigned int where)
{
return ((bus << 16 ) | (slot << 11 ) | (func << 8 ) | (where & 0 xfc) |
0 x80000000);
}
static int rt2880_pci_config_read(struct pci_bus *bus, unsigned int devfn,
int where, int size, u32 *val)
{
u32 address;
u32 data;
address = rt2880_pci_get_cfgaddr(bus->number, PCI_SLOT(devfn),
PCI_FUNC(devfn), where);
rt2880_pci_reg_write(address, RT2880_PCI_REG_CONFIG_ADDR);
data = rt2880_pci_reg_read(RT2880_PCI_REG_CONFIG_DATA);
switch (size) {
case 1 :
*val = (data >> ((where & 3 ) << 3 )) & 0 xff;
break ;
case 2 :
*val = (data >> ((where & 3 ) << 3 )) & 0 xffff;
break ;
case 4 :
*val = data;
break ;
}
return PCIBIOS_SUCCESSFUL;
}
static int rt2880_pci_config_write(struct pci_bus *bus, unsigned int devfn,
int where, int size, u32 val)
{
u32 address;
u32 data;
address = rt2880_pci_get_cfgaddr(bus->number, PCI_SLOT(devfn),
PCI_FUNC(devfn), where);
rt2880_pci_reg_write(address, RT2880_PCI_REG_CONFIG_ADDR);
data = rt2880_pci_reg_read(RT2880_PCI_REG_CONFIG_DATA);
switch (size) {
case 1 :
data = (data & ~(0 xff << ((where & 3 ) << 3 ))) |
(val << ((where & 3 ) << 3 ));
break ;
case 2 :
data = (data & ~(0 xffff << ((where & 3 ) << 3 ))) |
(val << ((where & 3 ) << 3 ));
break ;
case 4 :
data = val;
break ;
}
rt2880_pci_reg_write(data, RT2880_PCI_REG_CONFIG_DATA);
return PCIBIOS_SUCCESSFUL;
}
static struct pci_ops rt2880_pci_ops = {
.read = rt2880_pci_config_read,
.write = rt2880_pci_config_write,
};
static struct resource rt2880_pci_mem_resource = {
.name = "PCI MEM space" ,
.start = RT2880_PCI_MEM_BASE,
.end = RT2880_PCI_MEM_BASE + RT2880_PCI_MEM_SIZE - 1 ,
.flags = IORESOURCE_MEM,
};
static struct resource rt2880_pci_io_resource = {
.name = "PCI IO space" ,
.start = RT2880_PCI_IO_BASE,
.end = RT2880_PCI_IO_BASE + RT2880_PCI_IO_SIZE - 1 ,
.flags = IORESOURCE_IO,
};
static struct pci_controller rt2880_pci_controller = {
.pci_ops = &rt2880_pci_ops,
.mem_resource = &rt2880_pci_mem_resource,
.io_resource = &rt2880_pci_io_resource,
};
static inline u32 rt2880_pci_read_u32(unsigned long reg)
{
u32 address;
u32 ret;
address = rt2880_pci_get_cfgaddr(0 , 0 , 0 , reg);
rt2880_pci_reg_write(address, RT2880_PCI_REG_CONFIG_ADDR);
ret = rt2880_pci_reg_read(RT2880_PCI_REG_CONFIG_DATA);
return ret;
}
static inline void rt2880_pci_write_u32(unsigned long reg, u32 val)
{
u32 address;
address = rt2880_pci_get_cfgaddr(0 , 0 , 0 , reg);
rt2880_pci_reg_write(address, RT2880_PCI_REG_CONFIG_ADDR);
rt2880_pci_reg_write(val, RT2880_PCI_REG_CONFIG_DATA);
}
int pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
{
int irq = -1 ;
if (dev->bus->number != 0 )
return irq;
switch (PCI_SLOT(dev->devfn)) {
case 0 x00:
break ;
case 0 x11:
irq = RT288X_CPU_IRQ_PCI;
break ;
default :
pr_err("%s:%s[%d] trying to alloc unknown pci irq\n" ,
__FILE__, __func__, __LINE__);
BUG();
break ;
}
return irq;
}
static int rt288x_pci_probe(struct platform_device *pdev)
{
void __iomem *io_map_base;
rt2880_pci_base = ioremap(RT2880_PCI_BASE, PAGE_SIZE);
io_map_base = ioremap(RT2880_PCI_IO_BASE, RT2880_PCI_IO_SIZE);
rt2880_pci_controller.io_map_base = (unsigned long ) io_map_base;
set_io_port_base((unsigned long ) io_map_base);
ioport_resource.start = RT2880_PCI_IO_BASE;
ioport_resource.end = RT2880_PCI_IO_BASE + RT2880_PCI_IO_SIZE - 1 ;
rt2880_pci_reg_write(0 , RT2880_PCI_REG_PCICFG_ADDR);
udelay(1 );
rt2880_pci_reg_write(0 x79, RT2880_PCI_REG_ARBCTL);
rt2880_pci_reg_write(0 x07FF0001, RT2880_PCI_REG_BAR0SETUP_ADDR);
rt2880_pci_reg_write(RT2880_PCI_MEM_BASE, RT2880_PCI_REG_MEMBASE);
rt2880_pci_reg_write(RT2880_PCI_IO_BASE, RT2880_PCI_REG_IOBASE);
rt2880_pci_reg_write(0 x08000000, RT2880_PCI_REG_IMBASEBAR0_ADDR);
rt2880_pci_reg_write(0 x08021814, RT2880_PCI_REG_ID);
rt2880_pci_reg_write(0 x00800001, RT2880_PCI_REG_CLASS);
rt2880_pci_reg_write(0 x28801814, RT2880_PCI_REG_SUBID);
rt2880_pci_reg_write(0 x000c0000, RT2880_PCI_REG_PCIMSK_ADDR);
rt2880_pci_write_u32(PCI_BASE_ADDRESS_0, 0 x08000000);
(void ) rt2880_pci_read_u32(PCI_BASE_ADDRESS_0);
rt2880_pci_controller.of_node = pdev->dev.of_node;
register_pci_controller(&rt2880_pci_controller);
return 0 ;
}
int pcibios_plat_dev_init(struct pci_dev *dev)
{
static bool slot0_init;
/*
* Nobody seems to initialize slot 0, but this platform requires it, so
* do it once when some other slot is being enabled. The PCI subsystem
* should configure other slots properly, so no need to do anything
* special for those.
*/
if (!slot0_init && dev->bus->number == 0 ) {
u16 cmd;
u32 bar0;
slot0_init = true ;
pci_bus_write_config_dword(dev->bus, 0 , PCI_BASE_ADDRESS_0,
0 x08000000);
pci_bus_read_config_dword(dev->bus, 0 , PCI_BASE_ADDRESS_0,
&bar0);
pci_bus_read_config_word(dev->bus, 0 , PCI_COMMAND, &cmd);
cmd |= PCI_COMMAND_MASTER | PCI_COMMAND_IO | PCI_COMMAND_MEMORY;
pci_bus_write_config_word(dev->bus, 0 , PCI_COMMAND, cmd);
}
return 0 ;
}
static const struct of_device_id rt288x_pci_match[] = {
{ .compatible = "ralink,rt288x-pci" },
{},
};
static struct platform_driver rt288x_pci_driver = {
.probe = rt288x_pci_probe,
.driver = {
.name = "rt288x-pci" ,
.of_match_table = rt288x_pci_match,
},
};
static int __init pcibios_init(void )
{
int ret = platform_driver_register(&rt288x_pci_driver);
if (ret)
pr_info("rt288x-pci: Error registering platform driver!" );
return ret;
}
arch_initcall(pcibios_init);
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