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linux-sg2042/arch/mips/pci/pci-xlp.c

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/*
* Copyright (c) 2003-2012 Broadcom Corporation
* All Rights Reserved
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the Broadcom
* license below:
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY BROADCOM ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL BROADCOM OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/msi.h>
#include <linux/mm.h>
#include <linux/irq.h>
#include <linux/irqdesc.h>
#include <linux/console.h>
#include <asm/io.h>
#include <asm/netlogic/interrupt.h>
#include <asm/netlogic/haldefs.h>
#include <asm/netlogic/common.h>
#include <asm/netlogic/xlp-hal/iomap.h>
#include <asm/netlogic/xlp-hal/pic.h>
#include <asm/netlogic/xlp-hal/xlp.h>
#include <asm/netlogic/xlp-hal/pcibus.h>
#include <asm/netlogic/xlp-hal/bridge.h>
static void *pci_config_base;
#define pci_cfg_addr(bus, devfn, off) (((bus) << 20) | ((devfn) << 12) | (off))
/* PCI ops */
static inline u32 pci_cfg_read_32bit(struct pci_bus *bus, unsigned int devfn,
int where)
{
u32 data;
u32 *cfgaddr;
where &= ~3;
if (bus->number == 0 && PCI_SLOT(devfn) == 1 && where == 0x954)
return 0xffffffff;
cfgaddr = (u32 *)(pci_config_base +
pci_cfg_addr(bus->number, devfn, where));
data = *cfgaddr;
return data;
}
static inline void pci_cfg_write_32bit(struct pci_bus *bus, unsigned int devfn,
int where, u32 data)
{
u32 *cfgaddr;
cfgaddr = (u32 *)(pci_config_base +
pci_cfg_addr(bus->number, devfn, where & ~3));
*cfgaddr = data;
}
static int nlm_pcibios_read(struct pci_bus *bus, unsigned int devfn,
int where, int size, u32 *val)
{
u32 data;
if ((size == 2) && (where & 1))
return PCIBIOS_BAD_REGISTER_NUMBER;
else if ((size == 4) && (where & 3))
return PCIBIOS_BAD_REGISTER_NUMBER;
data = pci_cfg_read_32bit(bus, devfn, where);
if (size == 1)
*val = (data >> ((where & 3) << 3)) & 0xff;
else if (size == 2)
*val = (data >> ((where & 3) << 3)) & 0xffff;
else
*val = data;
return PCIBIOS_SUCCESSFUL;
}
static int nlm_pcibios_write(struct pci_bus *bus, unsigned int devfn,
int where, int size, u32 val)
{
u32 data;
if ((size == 2) && (where & 1))
return PCIBIOS_BAD_REGISTER_NUMBER;
else if ((size == 4) && (where & 3))
return PCIBIOS_BAD_REGISTER_NUMBER;
data = pci_cfg_read_32bit(bus, devfn, where);
if (size == 1)
data = (data & ~(0xff << ((where & 3) << 3))) |
(val << ((where & 3) << 3));
else if (size == 2)
data = (data & ~(0xffff << ((where & 3) << 3))) |
(val << ((where & 3) << 3));
else
data = val;
pci_cfg_write_32bit(bus, devfn, where, data);
return PCIBIOS_SUCCESSFUL;
}
struct pci_ops nlm_pci_ops = {
.read = nlm_pcibios_read,
.write = nlm_pcibios_write
};
static struct resource nlm_pci_mem_resource = {
.name = "XLP PCI MEM",
.start = 0xd0000000UL, /* 256MB PCI mem @ 0xd000_0000 */
.end = 0xdfffffffUL,
.flags = IORESOURCE_MEM,
};
static struct resource nlm_pci_io_resource = {
.name = "XLP IO MEM",
.start = 0x14000000UL, /* 64MB PCI IO @ 0x1000_0000 */
.end = 0x17ffffffUL,
.flags = IORESOURCE_IO,
};
struct pci_controller nlm_pci_controller = {
.index = 0,
.pci_ops = &nlm_pci_ops,
.mem_resource = &nlm_pci_mem_resource,
.mem_offset = 0x00000000UL,
.io_resource = &nlm_pci_io_resource,
.io_offset = 0x00000000UL,
};
static struct pci_dev *xlp_get_pcie_link(const struct pci_dev *dev)
{
struct pci_bus *bus, *p;
/* Find the bridge on bus 0 */
bus = dev->bus;
for (p = bus->parent; p && p->number != 0; p = p->parent)
bus = p;
return p ? bus->self : NULL;
}
static inline int nlm_pci_link_to_irq(int link)
{
return PIC_PCIE_LINK_0_IRQ + link;
}
int __init pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
{
struct pci_dev *lnkdev;
int lnkslot, lnkfunc;
/*
* For XLP PCIe, there is an IRQ per Link, find out which
* link the device is on to assign interrupts
*/
lnkdev = xlp_get_pcie_link(dev);
if (lnkdev == NULL)
return 0;
lnkfunc = PCI_FUNC(lnkdev->devfn);
lnkslot = PCI_SLOT(lnkdev->devfn);
return nlm_irq_to_xirq(lnkslot / 8, nlm_pci_link_to_irq(lnkfunc));
}
/* Do platform specific device initialization at pci_enable_device() time */
int pcibios_plat_dev_init(struct pci_dev *dev)
{
return 0;
}
/*
* If big-endian, enable hardware byteswap on the PCIe bridges.
* This will make both the SoC and PCIe devices behave consistently with
* readl/writel.
*/
#ifdef __BIG_ENDIAN
static void xlp_config_pci_bswap(int node, int link)
{
uint64_t nbubase, lnkbase;
u32 reg;
nbubase = nlm_get_bridge_regbase(node);
lnkbase = nlm_get_pcie_base(node, link);
/*
* Enable byte swap in hardware. Program each link's PCIe SWAP regions
* from the link's address ranges.
*/
reg = nlm_read_bridge_reg(nbubase, BRIDGE_PCIEMEM_BASE0 + link);
nlm_write_pci_reg(lnkbase, PCIE_BYTE_SWAP_MEM_BASE, reg);
reg = nlm_read_bridge_reg(nbubase, BRIDGE_PCIEMEM_LIMIT0 + link);
nlm_write_pci_reg(lnkbase, PCIE_BYTE_SWAP_MEM_LIM, reg | 0xfff);
reg = nlm_read_bridge_reg(nbubase, BRIDGE_PCIEIO_BASE0 + link);
nlm_write_pci_reg(lnkbase, PCIE_BYTE_SWAP_IO_BASE, reg);
reg = nlm_read_bridge_reg(nbubase, BRIDGE_PCIEIO_LIMIT0 + link);
nlm_write_pci_reg(lnkbase, PCIE_BYTE_SWAP_IO_LIM, reg | 0xfff);
}
#else
/* Swap configuration not needed in little-endian mode */
static inline void xlp_config_pci_bswap(int node, int link) {}
#endif /* __BIG_ENDIAN */
static int __init pcibios_init(void)
{
struct nlm_soc_info *nodep;
uint64_t pciebase;
int link, n;
u32 reg;
/* Firmware assigns PCI resources */
pci_set_flags(PCI_PROBE_ONLY);
pci_config_base = ioremap(XLP_DEFAULT_PCI_ECFG_BASE, 64 << 20);
/* Extend IO port for memory mapped io */
ioport_resource.start = 0;
ioport_resource.end = ~0;
for (n = 0; n < NLM_NR_NODES; n++) {
nodep = nlm_get_node(n);
if (!nodep->coremask)
continue; /* node does not exist */
for (link = 0; link < 4; link++) {
pciebase = nlm_get_pcie_base(n, link);
if (nlm_read_pci_reg(pciebase, 0) == 0xffffffff)
continue;
xlp_config_pci_bswap(n, link);
/* put in intpin and irq - u-boot does not */
reg = nlm_read_pci_reg(pciebase, 0xf);
reg &= ~0x1fu;
reg |= (1 << 8) | nlm_pci_link_to_irq(link);
nlm_write_pci_reg(pciebase, 0xf, reg);
pr_info("XLP PCIe: Link %d-%d initialized.\n", n, link);
}
}
set_io_port_base(CKSEG1);
nlm_pci_controller.io_map_base = CKSEG1;
register_pci_controller(&nlm_pci_controller);
pr_info("XLP PCIe Controller %pR%pR.\n", &nlm_pci_io_resource,
&nlm_pci_mem_resource);
return 0;
}
arch_initcall(pcibios_init);
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