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/*
* arch/arm/mach-orion5x/pci.c
*
* PCI and PCIe functions for Marvell Orion System On Chip
*
* Maintainer: Tzachi Perelstein <tzachi@marvell.com>
*
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without any
* warranty of any kind, whether express or implied.
*/
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/mbus.h>
#include <video/vga.h>
#include <asm/irq.h>
#include <asm/mach/pci.h>
#include <plat/pcie.h>
#include <plat/addr-map.h>
#include <mach/orion5x.h>
#include "common.h"
/*****************************************************************************
* Orion has one PCIe controller and one PCI controller.
*
* Note1: The local PCIe bus number is '0'. The local PCI bus number
* follows the scanned PCIe bridged busses, if any.
*
* Note2: It is possible for PCI/PCIe agents to access many subsystem's
* space, by configuring BARs and Address Decode Windows, e.g. flashes on
* device bus, Orion registers, etc. However this code only enable the
* access to DDR banks.
****************************************************************************/
/*****************************************************************************
* PCIe controller
****************************************************************************/
#define PCIE_BASE (ORION5X_PCIE_VIRT_BASE)
void __init orion5x_pcie_id(u32 *dev, u32 *rev)
{
*dev = orion_pcie_dev_id(PCIE_BASE);
*rev = orion_pcie_rev(PCIE_BASE);
}
static int pcie_valid_config(int bus, int dev)
{
/*
* Don't go out when trying to access --
* 1. nonexisting device on local bus
* 2. where there's no device connected (no link)
*/
if (bus == 0 && dev == 0)
return 1;
if (!orion_pcie_link_up(PCIE_BASE))
return 0;
if (bus == 0 && dev != 1)
return 0;
return 1;
}
/*
* PCIe config cycles are done by programming the PCIE_CONF_ADDR register
* and then reading the PCIE_CONF_DATA register. Need to make sure these
* transactions are atomic.
*/
static DEFINE_SPINLOCK(orion5x_pcie_lock);
static int pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,
int size, u32 *val)
{
unsigned long flags;
int ret;
if (pcie_valid_config(bus->number, PCI_SLOT(devfn)) == 0) {
*val = 0xffffffff;
return PCIBIOS_DEVICE_NOT_FOUND;
}
spin_lock_irqsave(&orion5x_pcie_lock, flags);
ret = orion_pcie_rd_conf(PCIE_BASE, bus, devfn, where, size, val);
spin_unlock_irqrestore(&orion5x_pcie_lock, flags);
return ret;
}
static int pcie_rd_conf_wa(struct pci_bus *bus, u32 devfn,
int where, int size, u32 *val)
{
int ret;
if (pcie_valid_config(bus->number, PCI_SLOT(devfn)) == 0) {
*val = 0xffffffff;
return PCIBIOS_DEVICE_NOT_FOUND;
}
/*
* We only support access to the non-extended configuration
* space when using the WA access method (or we would have to
* sacrifice 256M of CPU virtual address space.)
*/
if (where >= 0x100) {
*val = 0xffffffff;
return PCIBIOS_DEVICE_NOT_FOUND;
}
ret = orion_pcie_rd_conf_wa(ORION5X_PCIE_WA_VIRT_BASE,
bus, devfn, where, size, val);
return ret;
}
static int pcie_wr_conf(struct pci_bus *bus, u32 devfn,
int where, int size, u32 val)
{
unsigned long flags;
int ret;
if (pcie_valid_config(bus->number, PCI_SLOT(devfn)) == 0)
return PCIBIOS_DEVICE_NOT_FOUND;
spin_lock_irqsave(&orion5x_pcie_lock, flags);
ret = orion_pcie_wr_conf(PCIE_BASE, bus, devfn, where, size, val);
spin_unlock_irqrestore(&orion5x_pcie_lock, flags);
return ret;
}
static struct pci_ops pcie_ops = {
.read = pcie_rd_conf,
.write = pcie_wr_conf,
};
static int __init pcie_setup(struct pci_sys_data *sys)
{
struct resource *res;
int dev;
/*
* Generic PCIe unit setup.
*/
orion_pcie_setup(PCIE_BASE);
/*
* Check whether to apply Orion-1/Orion-NAS PCIe config
* read transaction workaround.
*/
dev = orion_pcie_dev_id(PCIE_BASE);
if (dev == MV88F5181_DEV_ID || dev == MV88F5182_DEV_ID) {
printk(KERN_NOTICE "Applying Orion-1/Orion-NAS PCIe config "
"read transaction workaround\n");
orion5x_setup_pcie_wa_win(ORION5X_PCIE_WA_PHYS_BASE,
ORION5X_PCIE_WA_SIZE);
pcie_ops.read = pcie_rd_conf_wa;
}
pci_ioremap_io(sys->busnr * SZ_64K, ORION5X_PCIE_IO_PHYS_BASE);
/*
* Request resources.
*/
res = kzalloc(sizeof(struct resource), GFP_KERNEL);
if (!res)
panic("pcie_setup unable to alloc resources");
/*
* IORESOURCE_MEM
*/
res->name = "PCIe Memory Space";
res->flags = IORESOURCE_MEM;
res->start = ORION5X_PCIE_MEM_PHYS_BASE;
res->end = res->start + ORION5X_PCIE_MEM_SIZE - 1;
if (request_resource(&iomem_resource, res))
panic("Request PCIe Memory resource failed\n");
pci_add_resource_offset(&sys->resources, res, sys->mem_offset);
return 1;
}
/*****************************************************************************
* PCI controller
****************************************************************************/
#define ORION5X_PCI_REG(x) (ORION5X_PCI_VIRT_BASE + (x))
#define PCI_MODE ORION5X_PCI_REG(0xd00)
#define PCI_CMD ORION5X_PCI_REG(0xc00)
#define PCI_P2P_CONF ORION5X_PCI_REG(0x1d14)
#define PCI_CONF_ADDR ORION5X_PCI_REG(0xc78)
#define PCI_CONF_DATA ORION5X_PCI_REG(0xc7c)
/*
* PCI_MODE bits
*/
#define PCI_MODE_64BIT (1 << 2)
#define PCI_MODE_PCIX ((1 << 4) | (1 << 5))
/*
* PCI_CMD bits
*/
#define PCI_CMD_HOST_REORDER (1 << 29)
/*
* PCI_P2P_CONF bits
*/
#define PCI_P2P_BUS_OFFS 16
#define PCI_P2P_BUS_MASK (0xff << PCI_P2P_BUS_OFFS)
#define PCI_P2P_DEV_OFFS 24
#define PCI_P2P_DEV_MASK (0x1f << PCI_P2P_DEV_OFFS)
/*
* PCI_CONF_ADDR bits
*/
#define PCI_CONF_REG(reg) ((reg) & 0xfc)
#define PCI_CONF_FUNC(func) (((func) & 0x3) << 8)
#define PCI_CONF_DEV(dev) (((dev) & 0x1f) << 11)
#define PCI_CONF_BUS(bus) (((bus) & 0xff) << 16)
#define PCI_CONF_ADDR_EN (1 << 31)
/*
* Internal configuration space
*/
#define PCI_CONF_FUNC_STAT_CMD 0
#define PCI_CONF_REG_STAT_CMD 4
#define PCIX_STAT 0x64
#define PCIX_STAT_BUS_OFFS 8
#define PCIX_STAT_BUS_MASK (0xff << PCIX_STAT_BUS_OFFS)
/*
* PCI Address Decode Windows registers
*/
#define PCI_BAR_SIZE_DDR_CS(n) (((n) == 0) ? ORION5X_PCI_REG(0xc08) : \
((n) == 1) ? ORION5X_PCI_REG(0xd08) : \
((n) == 2) ? ORION5X_PCI_REG(0xc0c) : \
((n) == 3) ? ORION5X_PCI_REG(0xd0c) : 0)
#define PCI_BAR_REMAP_DDR_CS(n) (((n) == 0) ? ORION5X_PCI_REG(0xc48) : \
((n) == 1) ? ORION5X_PCI_REG(0xd48) : \
((n) == 2) ? ORION5X_PCI_REG(0xc4c) : \
((n) == 3) ? ORION5X_PCI_REG(0xd4c) : 0)
#define PCI_BAR_ENABLE ORION5X_PCI_REG(0xc3c)
#define PCI_ADDR_DECODE_CTRL ORION5X_PCI_REG(0xd3c)
/*
* PCI configuration helpers for BAR settings
*/
#define PCI_CONF_FUNC_BAR_CS(n) ((n) >> 1)
#define PCI_CONF_REG_BAR_LO_CS(n) (((n) & 1) ? 0x18 : 0x10)
#define PCI_CONF_REG_BAR_HI_CS(n) (((n) & 1) ? 0x1c : 0x14)
/*
* PCI config cycles are done by programming the PCI_CONF_ADDR register
* and then reading the PCI_CONF_DATA register. Need to make sure these
* transactions are atomic.
*/
static DEFINE_SPINLOCK(orion5x_pci_lock);
static int orion5x_pci_cardbus_mode;
static int orion5x_pci_local_bus_nr(void)
{
u32 conf = readl(PCI_P2P_CONF);
return((conf & PCI_P2P_BUS_MASK) >> PCI_P2P_BUS_OFFS);
}
static int orion5x_pci_hw_rd_conf(int bus, int dev, u32 func,
u32 where, u32 size, u32 *val)
{
unsigned long flags;
spin_lock_irqsave(&orion5x_pci_lock, flags);
writel(PCI_CONF_BUS(bus) |
PCI_CONF_DEV(dev) | PCI_CONF_REG(where) |
PCI_CONF_FUNC(func) | PCI_CONF_ADDR_EN, PCI_CONF_ADDR);
*val = readl(PCI_CONF_DATA);
if (size == 1)
*val = (*val >> (8*(where & 0x3))) & 0xff;
else if (size == 2)
*val = (*val >> (8*(where & 0x3))) & 0xffff;
spin_unlock_irqrestore(&orion5x_pci_lock, flags);
return PCIBIOS_SUCCESSFUL;
}
static int orion5x_pci_hw_wr_conf(int bus, int dev, u32 func,
u32 where, u32 size, u32 val)
{
unsigned long flags;
int ret = PCIBIOS_SUCCESSFUL;
spin_lock_irqsave(&orion5x_pci_lock, flags);
writel(PCI_CONF_BUS(bus) |
PCI_CONF_DEV(dev) |
|