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MIPS: Reorganize Cavium OCTEON PCI support.

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Move the cavium PCI files to the arch/mips/pci directory.  Also cleanup
comment formatting and code layout.  Code from pci-common.c, was moved
into other files.

Signed-off-by: David Daney <ddaney@caviumnetworks.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
David Daney
2009-06-29 17:18:51 -07:00
committed by Ralf Baechle
parent ada8e9514b
commit 01a6221a6a
8 changed files with 197 additions and 221 deletions
Download Patch File Download Diff File Expand all files Collapse all files

5
arch/mips/pci/Makefile
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@@ -52,3 +52,8 @@ obj-$(CONFIG_VICTOR_MPC30X) += fixup-mpc30x.o
obj-$(CONFIG_ZAO_CAPCELLA) += fixup-capcella.o
obj-$(CONFIG_WR_PPMC) += fixup-wrppmc.o
obj-$(CONFIG_MIKROTIK_RB532) += pci-rc32434.o ops-rc32434.o fixup-rc32434.o
obj-$(CONFIG_CPU_CAVIUM_OCTEON) += pci-octeon.o pcie-octeon.o
ifdef CONFIG_PCI_MSI
obj-$(CONFIG_CPU_CAVIUM_OCTEON) += msi-octeon.o
endif

288
arch/mips/pci/msi-octeon.c Normal file
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@@ -0,0 +1,288 @@
/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 2005-2009 Cavium Networks
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/msi.h>
#include <linux/spinlock.h>
#include <linux/interrupt.h>
#include <asm/octeon/octeon.h>
#include <asm/octeon/cvmx-npi-defs.h>
#include <asm/octeon/cvmx-pci-defs.h>
#include <asm/octeon/cvmx-npei-defs.h>
#include <asm/octeon/cvmx-pexp-defs.h>
#include <asm/octeon/pci-octeon.h>
/*
* Each bit in msi_free_irq_bitmask represents a MSI interrupt that is
* in use.
*/
static uint64_t msi_free_irq_bitmask;
/*
* Each bit in msi_multiple_irq_bitmask tells that the device using
* this bit in msi_free_irq_bitmask is also using the next bit. This
* is used so we can disable all of the MSI interrupts when a device
* uses multiple.
*/
static uint64_t msi_multiple_irq_bitmask;
/*
* This lock controls updates to msi_free_irq_bitmask and
* msi_multiple_irq_bitmask.
*/
static DEFINE_SPINLOCK(msi_free_irq_bitmask_lock);
/**
* Called when a driver request MSI interrupts instead of the
* legacy INT A-D. This routine will allocate multiple interrupts
* for MSI devices that support them. A device can override this by
* programming the MSI control bits [6:4] before calling
* pci_enable_msi().
*
* @dev: Device requesting MSI interrupts
* @desc: MSI descriptor
*
* Returns 0 on success.
*/
int arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc)
{
struct msi_msg msg;
uint16_t control;
int configured_private_bits;
int request_private_bits;
int irq;
int irq_step;
uint64_t search_mask;
/*
* Read the MSI config to figure out how many IRQs this device
* wants. Most devices only want 1, which will give
* configured_private_bits and request_private_bits equal 0.
*/
pci_read_config_word(dev, desc->msi_attrib.pos + PCI_MSI_FLAGS,
&control);
/*
* If the number of private bits has been configured then use
* that value instead of the requested number. This gives the
* driver the chance to override the number of interrupts
* before calling pci_enable_msi().
*/
configured_private_bits = (control & PCI_MSI_FLAGS_QSIZE) >> 4;
if (configured_private_bits == 0) {
/* Nothing is configured, so use the hardware requested size */
request_private_bits = (control & PCI_MSI_FLAGS_QMASK) >> 1;
} else {
/*
* Use the number of configured bits, assuming the
* driver wanted to override the hardware request
* value.
*/
request_private_bits = configured_private_bits;
}
/*
* The PCI 2.3 spec mandates that there are at most 32
* interrupts. If this device asks for more, only give it one.
*/
if (request_private_bits > 5)
request_private_bits = 0;
try_only_one:
/*
* The IRQs have to be aligned on a power of two based on the
* number being requested.
*/
irq_step = 1 << request_private_bits;
/* Mask with one bit for each IRQ */
search_mask = (1 << irq_step) - 1;
/*
* We're going to search msi_free_irq_bitmask_lock for zero
* bits. This represents an MSI interrupt number that isn't in
* use.
*/
spin_lock(&msi_free_irq_bitmask_lock);
for (irq = 0; irq < 64; irq += irq_step) {
if ((msi_free_irq_bitmask & (search_mask << irq)) == 0) {
msi_free_irq_bitmask |= search_mask << irq;
msi_multiple_irq_bitmask |= (search_mask >> 1) << irq;
break;
}
}
spin_unlock(&msi_free_irq_bitmask_lock);
/* Make sure the search for available interrupts didn't fail */
if (irq >= 64) {
if (request_private_bits) {
pr_err("arch_setup_msi_irq: Unable to find %d free "
"interrupts, trying just one",
1 << request_private_bits);
request_private_bits = 0;
goto try_only_one;
} else
panic("arch_setup_msi_irq: Unable to find a free MSI "
"interrupt");
}
/* MSI interrupts start at logical IRQ OCTEON_IRQ_MSI_BIT0 */
irq += OCTEON_IRQ_MSI_BIT0;
switch (octeon_dma_bar_type) {
case OCTEON_DMA_BAR_TYPE_SMALL:
/* When not using big bar, Bar 0 is based at 128MB */
msg.address_lo =
((128ul << 20) + CVMX_PCI_MSI_RCV) & 0xffffffff;
msg.address_hi = ((128ul << 20) + CVMX_PCI_MSI_RCV) >> 32;
case OCTEON_DMA_BAR_TYPE_BIG:
/* When using big bar, Bar 0 is based at 0 */
msg.address_lo = (0 + CVMX_PCI_MSI_RCV) & 0xffffffff;
msg.address_hi = (0 + CVMX_PCI_MSI_RCV) >> 32;
break;
case OCTEON_DMA_BAR_TYPE_PCIE:
/* When using PCIe, Bar 0 is based at 0 */
/* FIXME CVMX_NPEI_MSI_RCV* other than 0? */
msg.address_lo = (0 + CVMX_NPEI_PCIE_MSI_RCV) & 0xffffffff;
msg.address_hi = (0 + CVMX_NPEI_PCIE_MSI_RCV) >> 32;
break;
default:
panic("arch_setup_msi_irq: Invalid octeon_dma_bar_type\n");
}
msg.data = irq - OCTEON_IRQ_MSI_BIT0;
/* Update the number of IRQs the device has available to it */
control &= ~PCI_MSI_FLAGS_QSIZE;
control |= request_private_bits << 4;
pci_write_config_word(dev, desc->msi_attrib.pos + PCI_MSI_FLAGS,
control);
set_irq_msi(irq, desc);
write_msi_msg(irq, &msg);
return 0;
}
/**
* Called when a device no longer needs its MSI interrupts. All
* MSI interrupts for the device are freed.
*
* @irq: The devices first irq number. There may be multple in sequence.
*/
void arch_teardown_msi_irq(unsigned int irq)
{
int number_irqs;
uint64_t bitmask;
if ((irq < OCTEON_IRQ_MSI_BIT0) || (irq > OCTEON_IRQ_MSI_BIT63))
panic("arch_teardown_msi_irq: Attempted to teardown illegal "
"MSI interrupt (%d)", irq);
irq -= OCTEON_IRQ_MSI_BIT0;
/*
* Count the number of IRQs we need to free by looking at the
* msi_multiple_irq_bitmask. Each bit set means that the next
* IRQ is also owned by this device.
*/
number_irqs = 0;
while ((irq+number_irqs < 64) &&
(msi_multiple_irq_bitmask & (1ull << (irq + number_irqs))))
number_irqs++;
number_irqs++;
/* Mask with one bit for each IRQ */
bitmask = (1 << number_irqs) - 1;
/* Shift the mask to the correct bit location */
bitmask <<= irq;
if ((msi_free_irq_bitmask & bitmask) != bitmask)
panic("arch_teardown_msi_irq: Attempted to teardown MSI "
"interrupt (%d) not in use", irq);
/* Checks are done, update the in use bitmask */
spin_lock(&msi_free_irq_bitmask_lock);
msi_free_irq_bitmask &= ~bitmask;
msi_multiple_irq_bitmask &= ~bitmask;
spin_unlock(&msi_free_irq_bitmask_lock);
}
/*
* Called by the interrupt handling code when an MSI interrupt
* occurs.
*/
static irqreturn_t octeon_msi_interrupt(int cpl, void *dev_id)
{
uint64_t msi_bits;
int irq;
if (octeon_dma_bar_type == OCTEON_DMA_BAR_TYPE_PCIE)
msi_bits = cvmx_read_csr(CVMX_PEXP_NPEI_MSI_RCV0);
else
msi_bits = cvmx_read_csr(CVMX_NPI_NPI_MSI_RCV);
irq = fls64(msi_bits);
if (irq) {
irq += OCTEON_IRQ_MSI_BIT0 - 1;
if (irq_desc[irq].action) {
do_IRQ(irq);
return IRQ_HANDLED;
} else {
pr_err("Spurious MSI interrupt %d\n", irq);
if (octeon_has_feature(OCTEON_FEATURE_PCIE)) {
/* These chips have PCIe */
cvmx_write_csr(CVMX_PEXP_NPEI_MSI_RCV0,
1ull << (irq -
OCTEON_IRQ_MSI_BIT0));
} else {
/* These chips have PCI */
cvmx_write_csr(CVMX_NPI_NPI_MSI_RCV,
1ull << (irq -
OCTEON_IRQ_MSI_BIT0));
}
}
}
return IRQ_NONE;
}
/*
* Initializes the MSI interrupt handling code
*/
int octeon_msi_initialize(void)
{
if (octeon_has_feature(OCTEON_FEATURE_PCIE)) {
if (request_irq(OCTEON_IRQ_PCI_MSI0, octeon_msi_interrupt,
IRQF_SHARED,
"MSI[0:63]", octeon_msi_interrupt))
panic("request_irq(OCTEON_IRQ_PCI_MSI0) failed");
} else if (octeon_is_pci_host()) {
if (request_irq(OCTEON_IRQ_PCI_MSI0, octeon_msi_interrupt,
IRQF_SHARED,
"MSI[0:15]", octeon_msi_interrupt))
panic("request_irq(OCTEON_IRQ_PCI_MSI0) failed");
if (request_irq(OCTEON_IRQ_PCI_MSI1, octeon_msi_interrupt,
IRQF_SHARED,
"MSI[16:31]", octeon_msi_interrupt))
panic("request_irq(OCTEON_IRQ_PCI_MSI1) failed");
if (request_irq(OCTEON_IRQ_PCI_MSI2, octeon_msi_interrupt,
IRQF_SHARED,
"MSI[32:47]", octeon_msi_interrupt))
panic("request_irq(OCTEON_IRQ_PCI_MSI2) failed");
if (request_irq(OCTEON_IRQ_PCI_MSI3, octeon_msi_interrupt,
IRQF_SHARED,
"MSI[48:63]", octeon_msi_interrupt))
panic("request_irq(OCTEON_IRQ_PCI_MSI3) failed");
}
return 0;
}
subsys_initcall(octeon_msi_initialize);

675
arch/mips/pci/pci-octeon.c Normal file
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@@ -0,0 +1,675 @@
/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 2005-2009 Cavium Networks
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/interrupt.h>
#include <linux/time.h>
#include <linux/delay.h>
#include <asm/time.h>
#include <asm/octeon/octeon.h>
#include <asm/octeon/cvmx-npi-defs.h>
#include <asm/octeon/cvmx-pci-defs.h>
#include <asm/octeon/pci-octeon.h>
#define USE_OCTEON_INTERNAL_ARBITER
/*
* Octeon's PCI controller uses did=3, subdid=2 for PCI IO
* addresses. Use PCI endian swapping 1 so no address swapping is
* necessary. The Linux io routines will endian swap the data.
*/
#define OCTEON_PCI_IOSPACE_BASE 0x80011a0400000000ull
#define OCTEON_PCI_IOSPACE_SIZE (1ull<<32)
/* Octeon't PCI controller uses did=3, subdid=3 for PCI memory. */
#define OCTEON_PCI_MEMSPACE_OFFSET (0x00011b0000000000ull)
/**
* This is the bit decoding used for the Octeon PCI controller addresses
*/
union octeon_pci_address {
uint64_t u64;
struct {
uint64_t upper:2;
uint64_t reserved:13;
uint64_t io:1;
uint64_t did:5;
uint64_t subdid:3;
uint64_t reserved2:4;
uint64_t endian_swap:2;
uint64_t reserved3:10;
uint64_t bus:8;
uint64_t dev:5;
uint64_t func:3;
uint64_t reg:8;
} s;
};
int __initdata (*octeon_pcibios_map_irq)(const struct pci_dev *dev,
u8 slot, u8 pin);
enum octeon_dma_bar_type octeon_dma_bar_type = OCTEON_DMA_BAR_TYPE_INVALID;
/**
* Map a PCI device to the appropriate interrupt line
*
* @dev: The Linux PCI device structure for the device to map
* @slot: The slot number for this device on __BUS 0__. Linux
* enumerates through all the bridges and figures out the
* slot on Bus 0 where this device eventually hooks to.
* @pin: The PCI interrupt pin read from the device, then swizzled
* as it goes through each bridge.
* Returns Interrupt number for the device
*/
int __init pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
{
if (octeon_pcibios_map_irq)
return octeon_pcibios_map_irq(dev, slot, pin);
else
panic("octeon_pcibios_map_irq not set.");
}
/*
* Called to perform platform specific PCI setup
*/
int pcibios_plat_dev_init(struct pci_dev *dev)
{
uint16_t config;
uint32_t dconfig;
int pos;
/*
* Force the Cache line setting to 64 bytes. The standard
* Linux bus scan doesn't seem to set it. Octeon really has
* 128 byte lines, but Intel bridges get really upset if you
* try and set values above 64 bytes. Value is specified in
* 32bit words.
*/
pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, 64 / 4);
/* Set latency timers for all devices */
pci_write_config_byte(dev, PCI_LATENCY_TIMER, 48);
/* Enable reporting System errors and parity errors on all devices */
/* Enable parity checking and error reporting */
pci_read_config_word(dev, PCI_COMMAND, &config);
config |= PCI_COMMAND_PARITY | PCI_COMMAND_SERR;
pci_write_config_word(dev, PCI_COMMAND, config);
if (dev->subordinate) {
/* Set latency timers on sub bridges */
pci_write_config_byte(dev, PCI_SEC_LATENCY_TIMER, 48);
/* More bridge error detection */
pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &config);
config |= PCI_BRIDGE_CTL_PARITY | PCI_BRIDGE_CTL_SERR;
pci_write_config_word(dev, PCI_BRIDGE_CONTROL, config);
}
/* Enable the PCIe normal error reporting */
pos = pci_find_capability(dev, PCI_CAP_ID_EXP);
if (pos) {
/* Update Device Control */
pci_read_config_word(dev, pos + PCI_EXP_DEVCTL, &config);
/* Correctable Error Reporting */
config |= PCI_EXP_DEVCTL_CERE;
/* Non-Fatal Error Reporting */
config |= PCI_EXP_DEVCTL_NFERE;
/* Fatal Error Reporting */
config |= PCI_EXP_DEVCTL_FERE;
/* Unsupported Request */
config |= PCI_EXP_DEVCTL_URRE;
pci_write_config_word(dev, pos + PCI_EXP_DEVCTL, config);
}
/* Find the Advanced Error Reporting capability */
pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);
if (pos) {
/* Clear Uncorrectable Error Status */
pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS,
&dconfig);
pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS,
dconfig);
/* Enable reporting of all uncorrectable errors */
/* Uncorrectable Error Mask - turned on bits disable errors */
pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_MASK, 0);
/*
* Leave severity at HW default. This only controls if
* errors are reported as uncorrectable or
* correctable, not if the error is reported.
*/
/* PCI_ERR_UNCOR_SEVER - Uncorrectable Error Severity */
/* Clear Correctable Error Status */
pci_read_config_dword(dev, pos + PCI_ERR_COR_STATUS, &dconfig);
pci_write_config_dword(dev, pos + PCI_ERR_COR_STATUS, dconfig);
/* Enable reporting of all correctable errors */
/* Correctable Error Mask - turned on bits disable errors */
pci_write_config_dword(dev, pos + PCI_ERR_COR_MASK, 0);
/* Advanced Error Capabilities */
pci_read_config_dword(dev, pos + PCI_ERR_CAP, &dconfig);
/* ECRC Generation Enable */
if (config & PCI_ERR_CAP_ECRC_GENC)
config |= PCI_ERR_CAP_ECRC_GENE;
/* ECRC Check Enable */
if (config & PCI_ERR_CAP_ECRC_CHKC)
config |= PCI_ERR_CAP_ECRC_CHKE;
pci_write_config_dword(dev, pos + PCI_ERR_CAP, dconfig);
/* PCI_ERR_HEADER_LOG - Header Log Register (16 bytes) */
/* Report all errors to the root complex */
pci_write_config_dword(dev, pos + PCI_ERR_ROOT_COMMAND,
PCI_ERR_ROOT_CMD_COR_EN |
PCI_ERR_ROOT_CMD_NONFATAL_EN |
PCI_ERR_ROOT_CMD_FATAL_EN);
/* Clear the Root status register */
pci_read_config_dword(dev, pos + PCI_ERR_ROOT_STATUS, &dconfig);
pci_write_config_dword(dev, pos + PCI_ERR_ROOT_STATUS, dconfig);
}
return 0;
}
/**
* Return the mapping of PCI device number to IRQ line. Each
* character in the return string represents the interrupt
* line for the device at that position. Device 1 maps to the
* first character, etc. The characters A-D are used for PCI
* interrupts.
*
* Returns PCI interrupt mapping
*/
const char *octeon_get_pci_interrupts(void)
{
/*
* Returning an empty string causes the interrupts to be
* routed based on the PCI specification. From the PCI spec:
*
* INTA# of Device Number 0 is connected to IRQW on the system
* board. (Device Number has no significance regarding being
* located on the system board or in a connector.) INTA# of
* Device Number 1 is connected to IRQX on the system
* board. INTA# of Device Number 2 is connected to IRQY on the
* system board. INTA# of Device Number 3 is connected to IRQZ
* on the system board. The table below describes how each
* agent's INTx# lines are connected to the system board
* interrupt lines. The following equation can be used to
* determine to which INTx# signal on the system board a given
* device's INTx# line(s) is connected.
*
* MB = (D + I) MOD 4 MB = System board Interrupt (IRQW = 0,
* IRQX = 1, IRQY = 2, and IRQZ = 3) D = Device Number I =
* Interrupt Number (INTA# = 0, INTB# = 1, INTC# = 2, and
* INTD# = 3)
*/
switch (octeon_bootinfo->board_type) {
case CVMX_BOARD_TYPE_NAO38:
/* This is really the NAC38 */
return "AAAAADABAAAAAAAAAAAAAAAAAAAAAAAA";
case CVMX_BOARD_TYPE_THUNDER:
return "";
case CVMX_BOARD_TYPE_EBH3000:
return "";
case CVMX_BOARD_TYPE_EBH3100:
case CVMX_BOARD_TYPE_CN3010_EVB_HS5:
case CVMX_BOARD_TYPE_CN3005_EVB_HS5:
return "AAABAAAAAAAAAAAAAAAAAAAAAAAAAAAA";
case CVMX_BOARD_TYPE_BBGW_REF:
return "AABCD";
default:
return "";
}
}
/**
* Map a PCI device to the appropriate interrupt line
*
* @dev: The Linux PCI device structure for the device to map
* @slot: The slot number for this device on __BUS 0__. Linux
* enumerates through all the bridges and figures out the
* slot on Bus 0 where this device eventually hooks to.
* @pin: The PCI interrupt pin read from the device, then swizzled
* as it goes through each bridge.
* Returns Interrupt number for the device
*/
int __init octeon_pci_pcibios_map_irq(const struct pci_dev *dev,
u8 slot, u8 pin)
{
int irq_num;
const char *interrupts;
int dev_num;
/* Get the board specific interrupt mapping */
interrupts = octeon_get_pci_interrupts();
dev_num = dev->devfn >> 3;
if (dev_num < strlen(interrupts))
irq_num = ((interrupts[dev_num] - 'A' + pin - 1) & 3) +
OCTEON_IRQ_PCI_INT0;
else
irq_num = ((slot + pin - 3) & 3) + OCTEON_IRQ_PCI_INT0;
return irq_num;
}
/*
* Read a value from configuration space
*/
static int octeon_read_config(struct pci_bus *bus, unsigned int devfn,
int reg, int size, u32 *val)
{
union octeon_pci_address pci_addr;
pci_addr.u64 = 0;
pci_addr.s.upper = 2;
pci_addr.s.io = 1;
pci_addr.s.did = 3;
pci_addr.s.subdid = 1;
pci_addr.s.endian_swap = 1;
pci_addr.s.bus = bus->number;
pci_addr.s.dev = devfn >> 3;
pci_addr.s.func = devfn & 0x7;
pci_addr.s.reg = reg;
#if PCI_CONFIG_SPACE_DELAY
udelay(PCI_CONFIG_SPACE_DELAY);
#endif
switch (size) {
case 4:
*val = le32_to_cpu(cvmx_read64_uint32(pci_addr.u64));
return PCIBIOS_SUCCESSFUL;
case 2:
*val = le16_to_cpu(cvmx_read64_uint16(pci_addr.u64));
return PCIBIOS_SUCCESSFUL;
case 1:
*val = cvmx_read64_uint8(pci_addr.u64);
return PCIBIOS_SUCCESSFUL;
}
return PCIBIOS_FUNC_NOT_SUPPORTED;
}
/*
* Write a value to PCI configuration space
*/
static int octeon_write_config(struct pci_bus *bus, unsigned int devfn,
int reg, int size, u32 val)
{
union octeon_pci_address pci_addr;
pci_addr.u64 = 0;
pci_addr.s.upper = 2;
pci_addr.s.io = 1;
pci_addr.s.did = 3;
pci_addr.s.subdid = 1;
pci_addr.s.endian_swap = 1;
pci_addr.s.bus = bus->number;
pci_addr.s.dev = devfn >> 3;
pci_addr.s.func = devfn & 0x7;
pci_addr.s.reg = reg;
#if PCI_CONFIG_SPACE_DELAY
udelay(PCI_CONFIG_SPACE_DELAY);
#endif
switch (size) {
case 4:
cvmx_write64_uint32(pci_addr.u64, cpu_to_le32(val));
return PCIBIOS_SUCCESSFUL;
case 2:
cvmx_write64_uint16(pci_addr.u64, cpu_to_le16(val));
return PCIBIOS_SUCCESSFUL;
case 1:
cvmx_write64_uint8(pci_addr.u64, val);
return PCIBIOS_SUCCESSFUL;
}
return PCIBIOS_FUNC_NOT_SUPPORTED;
}
static struct pci_ops octeon_pci_ops = {
octeon_read_config,
octeon_write_config,
};
static struct resource octeon_pci_mem_resource = {
.start = 0,
.end = 0,
.name = "Octeon PCI MEM",
.flags = IORESOURCE_MEM,
};
/*
* PCI ports must be above 16KB so the ISA bus filtering in the PCI-X to PCI
* bridge
*/
static struct resource octeon_pci_io_resource = {
.start = 0x4000,
.end = OCTEON_PCI_IOSPACE_SIZE - 1,
.name = "Octeon PCI IO",
.flags = IORESOURCE_IO,
};
static struct pci_controller octeon_pci_controller = {
.pci_ops = &octeon_pci_ops,
.mem_resource = &octeon_pci_mem_resource,
.mem_offset = OCTEON_PCI_MEMSPACE_OFFSET,
.io_resource = &octeon_pci_io_resource,
.io_offset = 0,
.io_map_base = OCTEON_PCI_IOSPACE_BASE,
};
/*
* Low level initialize the Octeon PCI controller
*/
static void octeon_pci_initialize(void)
{
union cvmx_pci_cfg01 cfg01;
union cvmx_npi_ctl_status ctl_status;
union cvmx_pci_ctl_status_2 ctl_status_2;
union cvmx_pci_cfg19 cfg19;
union cvmx_pci_cfg16 cfg16;
union cvmx_pci_cfg22 cfg22;
union cvmx_pci_cfg56 cfg56;
/* Reset the PCI Bus */
cvmx_write_csr(CVMX_CIU_SOFT_PRST, 0x1);
cvmx_read_csr(CVMX_CIU_SOFT_PRST);
udelay(2000); /* Hold PCI reset for 2 ms */
ctl_status.u64 = 0; /* cvmx_read_csr(CVMX_NPI_CTL_STATUS); */
ctl_status.s.max_word = 1;
ctl_status.s.timer = 1;
cvmx_write_csr(CVMX_NPI_CTL_STATUS, ctl_status.u64);
/* Deassert PCI reset and advertize PCX Host Mode Device Capability
(64b) */
cvmx_write_csr(CVMX_CIU_SOFT_PRST, 0x4);
cvmx_read_csr(CVMX_CIU_SOFT_PRST);
udelay(2000); /* Wait 2 ms after deasserting PCI reset */
ctl_status_2.u32 = 0;
ctl_status_2.s.tsr_hwm = 1; /* Initializes to 0. Must be set
before any PCI reads. */
ctl_status_2.s.bar2pres = 1; /* Enable BAR2 */
ctl_status_2.s.bar2_enb = 1;
ctl_status_2.s.bar2_cax = 1; /* Don't use L2 */
ctl_status_2.s.bar2_esx = 1;
ctl_status_2.s.pmo_amod = 1; /* Round robin priority */
if (octeon_dma_bar_type == OCTEON_DMA_BAR_TYPE_BIG) {
/* BAR1 hole */
ctl_status_2.s.bb1_hole = OCTEON_PCI_BAR1_HOLE_BITS;
ctl_status_2.s.bb1_siz = 1; /* BAR1 is 2GB */
ctl_status_2.s.bb_ca = 1; /* Don't use L2 with big bars */
ctl_status_2.s.bb_es = 1; /* Big bar in byte swap mode */
ctl_status_2.s.bb1 = 1; /* BAR1 is big */
ctl_status_2.s.bb0 = 1; /* BAR0 is big */
}
octeon_npi_write32(CVMX_NPI_PCI_CTL_STATUS_2, ctl_status_2.u32);
udelay(2000); /* Wait 2 ms before doing PCI reads */
ctl_status_2.u32 = octeon_npi_read32(CVMX_NPI_PCI_CTL_STATUS_2);
pr_notice("PCI Status: %s %s-bit\n",
ctl_status_2.s.ap_pcix ? "PCI-X" : "PCI",
ctl_status_2.s.ap_64ad ? "64" : "32");
if (OCTEON_IS_MODEL(OCTEON_CN58XX) || OCTEON_IS_MODEL(OCTEON_CN50XX)) {
union cvmx_pci_cnt_reg cnt_reg_start;
union cvmx_pci_cnt_reg cnt_reg_end;
unsigned long cycles, pci_clock;
cnt_reg_start.u64 = cvmx_read_csr(CVMX_NPI_PCI_CNT_REG);
cycles = read_c0_cvmcount();
udelay(1000);
cnt_reg_end.u64 = cvmx_read_csr(CVMX_NPI_PCI_CNT_REG);
cycles = read_c0_cvmcount() - cycles;
pci_clock = (cnt_reg_end.s.pcicnt - cnt_reg_start.s.pcicnt) /
(cycles / (mips_hpt_frequency / 1000000));
pr_notice("PCI Clock: %lu MHz\n", pci_clock);
}
/*
* TDOMC must be set to one in PCI mode. TDOMC should be set to 4
* in PCI-X mode to allow four oustanding splits. Otherwise,
* should not change from its reset value. Don't write PCI_CFG19
* in PCI mode (0x82000001 reset value), write it to 0x82000004
* after PCI-X mode is known. MRBCI,MDWE,MDRE -> must be zero.
* MRBCM -> must be one.
*/
if (ctl_status_2.s.ap_pcix) {
cfg19.u32 = 0;
/*
* Target Delayed/Split request outstanding maximum
* count. [1..31] and 0=32. NOTE: If the user
* programs these bits beyond the Designed Maximum
* outstanding count, then the designed maximum table
* depth will be used instead. No additional
* Deferred/Split transactions will be accepted if
* this outstanding maximum count is
* reached. Furthermore, no additional deferred/split
* transactions will be accepted if the I/O delay/ I/O
* Split Request outstanding maximum is reached.
*/
cfg19.s.tdomc = 4;
/*
* Master Deferred Read Request Outstanding Max Count
* (PCI only). CR4C[26:24] Max SAC cycles MAX DAC
* cycles 000 8 4 001 1 0 010 2 1 011 3 1 100 4 2 101
* 5 2 110 6 3 111 7 3 For example, if these bits are
* programmed to 100, the core can support 2 DAC
* cycles, 4 SAC cycles or a combination of 1 DAC and
* 2 SAC cycles. NOTE: For the PCI-X maximum
* outstanding split transactions, refer to
* CRE0[22:20].
*/
cfg19.s.mdrrmc = 2;
/*
* Master Request (Memory Read) Byte Count/Byte Enable
* select. 0 = Byte Enables valid. In PCI mode, a
* burst transaction cannot be performed using Memory
* Read command=4?h6. 1 = DWORD Byte Count valid
* (default). In PCI Mode, the memory read byte
* enables are automatically generated by the
* core. Note: N3 Master Request transaction sizes are
* always determined through the
* am_attr[<35:32>|<7:0>] field.
*/
cfg19.s.mrbcm = 1;
octeon_npi_write32(CVMX_NPI_PCI_CFG19, cfg19.u32);
}
cfg01.u32 = 0;
cfg01.s.msae = 1; /* Memory Space Access Enable */
cfg01.s.me = 1; /* Master Enable */
cfg01.s.pee = 1; /* PERR# Enable */
cfg01.s.see = 1; /* System Error Enable */
cfg01.s.fbbe = 1; /* Fast Back to Back Transaction Enable */
octeon_npi_write32(CVMX_NPI_PCI_CFG01, cfg01.u32);
#ifdef USE_OCTEON_INTERNAL_ARBITER
/*
* When OCTEON is a PCI host, most systems will use OCTEON's
* internal arbiter, so must enable it before any PCI/PCI-X
* traffic can occur.
*/
{
union cvmx_npi_pci_int_arb_cfg pci_int_arb_cfg;
pci_int_arb_cfg.u64 = 0;
pci_int_arb_cfg.s.en = 1; /* Internal arbiter enable */
cvmx_write_csr(CVMX_NPI_PCI_INT_ARB_CFG, pci_int_arb_cfg.u64);
}
#endif /* USE_OCTEON_INTERNAL_ARBITER */
/*
* Preferrably written to 1 to set MLTD. [RDSATI,TRTAE,
* TWTAE,TMAE,DPPMR -> must be zero. TILT -> must not be set to
* 1..7.
*/
cfg16.u32 = 0;
cfg16.s.mltd = 1; /* Master Latency Timer Disable */
octeon_npi_write32(CVMX_NPI_PCI_CFG16, cfg16.u32);
/*
* Should be written to 0x4ff00. MTTV -> must be zero.
* FLUSH -> must be 1. MRV -> should be 0xFF.
*/
cfg22.u32 = 0;
/* Master Retry Value [1..255] and 0=infinite */
cfg22.s.mrv = 0xff;
/*
* AM_DO_FLUSH_I control NOTE: This bit MUST BE ONE for proper
* N3K operation.
*/
cfg22.s.flush = 1;
octeon_npi_write32(CVMX_NPI_PCI_CFG22, cfg22.u32);
/*
* MOST Indicates the maximum number of outstanding splits (in -1
* notation) when OCTEON is in PCI-X mode. PCI-X performance is
* affected by the MOST selection. Should generally be written
* with one of 0x3be807, 0x2be807, 0x1be807, or 0x0be807,
* depending on the desired MOST of 3, 2, 1, or 0, respectively.
*/
cfg56.u32 = 0;
cfg56.s.pxcid = 7; /* RO - PCI-X Capability ID */
cfg56.s.ncp = 0xe8; /* RO - Next Capability Pointer */
cfg56.s.dpere = 1; /* Data Parity Error Recovery Enable */
cfg56.s.roe = 1; /* Relaxed Ordering Enable */
cfg56.s.mmbc = 1; /* Maximum Memory Byte Count
[0=512B,1=1024B,2=2048B,3=4096B] */
cfg56.s.most = 3; /* Maximum outstanding Split transactions [0=1
.. 7=32] */
octeon_npi_write32(CVMX_NPI_PCI_CFG56, cfg56.u32);
/*
* Affects PCI performance when OCTEON services reads to its
* BAR1/BAR2. Refer to Section 10.6.1. The recommended values are
* 0x22, 0x33, and 0x33 for PCI_READ_CMD_6, PCI_READ_CMD_C, and
* PCI_READ_CMD_E, respectively. Unfortunately due to errata DDR-700,
* these values need to be changed so they won't possibly prefetch off
* of the end of memory if PCI is DMAing a buffer at the end of
* memory. Note that these values differ from their reset values.
*/
octeon_npi_write32(CVMX_NPI_PCI_READ_CMD_6, 0x21);
octeon_npi_write32(CVMX_NPI_PCI_READ_CMD_C, 0x31);
octeon_npi_write32(CVMX_NPI_PCI_READ_CMD_E, 0x31);
}
/*
* Initialize the Octeon PCI controller
*/
static int __init octeon_pci_setup(void)
{
union cvmx_npi_mem_access_subidx mem_access;
int index;
/* Only these chips have PCI */
if (octeon_has_feature(OCTEON_FEATURE_PCIE))
return 0;
/* Point pcibios_map_irq() to the PCI version of it */
octeon_pcibios_map_irq = octeon_pci_pcibios_map_irq;
/* Only use the big bars on chips that support it */
if (OCTEON_IS_MODEL(OCTEON_CN31XX) ||
OCTEON_IS_MODEL(OCTEON_CN38XX_PASS2) ||
OCTEON_IS_MODEL(OCTEON_CN38XX_PASS1))
octeon_dma_bar_type = OCTEON_DMA_BAR_TYPE_SMALL;
else
octeon_dma_bar_type = OCTEON_DMA_BAR_TYPE_BIG;
/* PCI I/O and PCI MEM values */
set_io_port_base(OCTEON_PCI_IOSPACE_BASE);
ioport_resource.start = 0;
ioport_resource.end = OCTEON_PCI_IOSPACE_SIZE - 1;
if (!octeon_is_pci_host()) {
pr_notice("Not in host mode, PCI Controller not initialized\n");
return 0;
}
pr_notice("%s Octeon big bar support\n",
(octeon_dma_bar_type ==
OCTEON_DMA_BAR_TYPE_BIG) ? "Enabling" : "Disabling");
octeon_pci_initialize();
mem_access.u64 = 0;
mem_access.s.esr = 1; /* Endian-Swap on read. */
mem_access.s.esw = 1; /* Endian-Swap on write. */
mem_access.s.nsr = 0; /* No-Snoop on read. */
mem_access.s.nsw = 0; /* No-Snoop on write. */
mem_access.s.ror = 0; /* Relax Read on read. */
mem_access.s.row = 0; /* Relax Order on write. */
mem_access.s.ba = 0; /* PCI Address bits [63:36]. */
cvmx_write_csr(CVMX_NPI_MEM_ACCESS_SUBID3, mem_access.u64);
/*
* Remap the Octeon BAR 2 above all 32 bit devices
* (0x8000000000ul). This is done here so it is remapped
* before the readl()'s below. We don't want BAR2 overlapping
* with BAR0/BAR1 during these reads.
*/
octeon_npi_write32(CVMX_NPI_PCI_CFG08, 0);
octeon_npi_write32(CVMX_NPI_PCI_CFG09, 0x80);
/* Disable the BAR1 movable mappings */
for (index = 0; index < 32; index++)
octeon_npi_write32(CVMX_NPI_PCI_BAR1_INDEXX(index), 0);
if (octeon_dma_bar_type == OCTEON_DMA_BAR_TYPE_BIG) {
/* Remap the Octeon BAR 0 to 0-2GB */
octeon_npi_write32(CVMX_NPI_PCI_CFG04, 0);
octeon_npi_write32(CVMX_NPI_PCI_CFG05, 0);
/*
* Remap the Octeon BAR 1 to map 2GB-4GB (minus the
* BAR 1 hole).
*/
octeon_npi_write32(CVMX_NPI_PCI_CFG06, 2ul << 30);
octeon_npi_write32(CVMX_NPI_PCI_CFG07, 0);
/* Devices go after BAR1 */
octeon_pci_mem_resource.start =
OCTEON_PCI_MEMSPACE_OFFSET + (4ul << 30) -
(OCTEON_PCI_BAR1_HOLE_SIZE << 20);
octeon_pci_mem_resource.end =
octeon_pci_mem_resource.start + (1ul << 30);
} else {
/* Remap the Octeon BAR 0 to map 128MB-(128MB+4KB) */
octeon_npi_write32(CVMX_NPI_PCI_CFG04, 128ul << 20);
octeon_npi_write32(CVMX_NPI_PCI_CFG05, 0);
/* Remap the Octeon BAR 1 to map 0-128MB */
octeon_npi_write32(CVMX_NPI_PCI_CFG06, 0);
octeon_npi_write32(CVMX_NPI_PCI_CFG07, 0);
/* Devices go after BAR0 */
octeon_pci_mem_resource.start =
OCTEON_PCI_MEMSPACE_OFFSET + (128ul << 20) +
(4ul << 10);
octeon_pci_mem_resource.end =
octeon_pci_mem_resource.start + (1ul << 30);
}
register_pci_controller(&octeon_pci_controller);
/*
* Clear any errors that might be pending from before the bus
* was setup properly.
*/
cvmx_write_csr(CVMX_NPI_PCI_INT_SUM2, -1);
return 0;
}
arch_initcall(octeon_pci_setup);

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