// 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/of_platform.h>
#include <linux/of_irq.h>
#include <linux/of_pci.h>
#include <asm/mach-ralink/rt288x.h>
#define RT2880_PCI_BASE 0x00440000
#define RT288X_CPU_IRQ_PCI 4
#define RT2880_PCI_MEM_BASE 0x20000000
#define RT2880_PCI_MEM_SIZE 0x10000000
#define RT2880_PCI_IO_BASE 0x00460000
#define RT2880_PCI_IO_SIZE 0x00010000
#define RT2880_PCI_REG_PCICFG_ADDR 0x00
#define RT2880_PCI_REG_PCIMSK_ADDR 0x0c
#define RT2880_PCI_REG_BAR0SETUP_ADDR 0x10
#define RT2880_PCI_REG_IMBASEBAR0_ADDR 0x18
#define RT2880_PCI_REG_CONFIG_ADDR 0x20
#define RT2880_PCI_REG_CONFIG_DATA 0x24
#define RT2880_PCI_REG_MEMBASE 0x28
#define RT2880_PCI_REG_IOBASE 0x2c
#define RT2880_PCI_REG_ID 0x30
#define RT2880_PCI_REG_CLASS 0x34
#define RT2880_PCI_REG_SUBID 0x38
#define RT2880_PCI_REG_ARBCTL 0x80
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 & 0xfc) |
0x80000000);
}
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)) & 0xff;
break;
case 2:
*val = (data >> ((where & 3) << 3)) & 0xffff;
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 & ~(0xff << ((where & 3) << 3))) |
(val << ((where & 3) << 3));
break;
case 2:
data = (data & ~(0xffff << ((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 0x00:
break;
case 0x11:
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(0x79, RT2880_PCI_REG_ARBCTL);
rt2880_pci_reg_write(0x07FF0001, 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(0x08000000, RT2880_PCI_REG_IMBASEBAR0_ADDR);
rt2880_pci_reg_write(0x08021814, RT2880_PCI_REG_ID);
rt2880_pci_reg_write(0x00800001, RT2880_PCI_REG_CLASS);
rt2880_pci_reg_write(0x28801814, RT2880_PCI_REG_SUBID);
rt2880_pci_reg_write(0x000c0000, RT2880_PCI_REG_PCIMSK_ADDR);
rt2880_pci_write_u32(PCI_BASE_ADDRESS_0, 0x08000000);
(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,
0x08000000);
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,
},
};
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);
