/*
* Copyright 2012 Tilera Corporation. All Rights Reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, version 2.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
* NON INFRINGEMENT. See the GNU General Public License for
* more details.
*/
#include <linux/kernel.h>
#include <linux/mmzone.h>
#include <linux/pci.h>
#include <linux/delay.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/capability.h>
#include <linux/sched.h>
#include <linux/errno.h>
#include <linux/irq.h>
#include <linux/msi.h>
#include <linux/io.h>
#include <linux/uaccess.h>
#include <linux/ctype.h>
#include <asm/processor.h>
#include <asm/sections.h>
#include <asm/byteorder.h>
#include <gxio/iorpc_globals.h>
#include <gxio/kiorpc.h>
#include <gxio/trio.h>
#include <gxio/iorpc_trio.h>
#include <hv/drv_trio_intf.h>
#include <arch/sim.h>
/*
* This file containes the routines to search for PCI buses,
* enumerate the buses, and configure any attached devices.
*/
#define DEBUG_PCI_CFG 0
#if DEBUG_PCI_CFG
#define TRACE_CFG_WR(size, val, bus, dev, func, offset) \
pr_info("CFG WR %d-byte VAL %#x to bus %d dev %d func %d addr %u\n", \
size, val, bus, dev, func, offset & 0xFFF);
#define TRACE_CFG_RD(size, val, bus, dev, func, offset) \
pr_info("CFG RD %d-byte VAL %#x from bus %d dev %d func %d addr %u\n", \
size, val, bus, dev, func, offset & 0xFFF);
#else
#define TRACE_CFG_WR(...)
#define TRACE_CFG_RD(...)
#endif
static int pci_probe = 1;
/* Information on the PCIe RC ports configuration. */
static int pcie_rc[TILEGX_NUM_TRIO][TILEGX_TRIO_PCIES];
/*
* On some platforms with one or more Gx endpoint ports, we need to
* delay the PCIe RC port probe for a few seconds to work around
* a HW PCIe link-training bug. The exact delay is specified with
* a kernel boot argument in the form of "pcie_rc_delay=T,P,S",
* where T is the TRIO instance number, P is the port number and S is
* the delay in seconds. If the delay is not provided, the value
* will be DEFAULT_RC_DELAY.
*/
static int rc_delay[TILEGX_NUM_TRIO][TILEGX_TRIO_PCIES];
/* Default number of seconds that the PCIe RC port probe can be delayed. */
#define DEFAULT_RC_DELAY 10
/* Max number of seconds that the PCIe RC port probe can be delayed. */
#define MAX_RC_DELAY 20
/* Array of the PCIe ports configuration info obtained from the BIB. */
struct pcie_port_property pcie_ports[TILEGX_NUM_TRIO][TILEGX_TRIO_PCIES];
/* All drivers share the TRIO contexts defined here. */
gxio_trio_context_t trio_contexts[TILEGX_NUM_TRIO];
/* Pointer to an array of PCIe RC controllers. */
struct pci_controller pci_controllers[TILEGX_NUM_TRIO * TILEGX_TRIO_PCIES];
int num_rc_controllers;
static int num_ep_controllers;
static struct pci_ops tile_cfg_ops;
/* Mask of CPUs that should receive PCIe interrupts. */
static struct cpumask intr_cpus_map;
/*
* We don't need to worry about the alignment of resources.
*/
resource_size_t pcibios_align_resource(void *data, const struct resource *res,
resource_size_t size, resource_size_t align)
{
return res->start;
}
EXPORT_SYMBOL(pcibios_align_resource);
/*
* Pick a CPU to receive and handle the PCIe interrupts, based on the IRQ #.
* For now, we simply send interrupts to non-dataplane CPUs.
* We may implement methods to allow user to specify the target CPUs,
* e.g. via boot arguments.
*/
static int tile_irq_cpu(int irq)
{
unsigned int count;
int i = 0;
int cpu;
count = cpumask_weight(&intr_cpus_map);
if (unlikely(count == 0)) {
pr_warning("intr_cpus_map empty, interrupts will be"
" delievered to dataplane tiles\n");
return irq % (smp_height * smp_width);
}
count = irq % count;
for_each_cpu(cpu, &intr_cpus_map) {
if (i++ == count)
break;
}
return cpu;
}
/*
* Open a file descriptor to the TRIO shim.
*/
static int tile_pcie_open(int trio_index)
{
gxio_trio_context_t *context = &trio_contexts[trio_index];
int ret;
/*
* This opens a file descriptor to the TRIO shim.
*/
ret = gxio_trio_init(context, trio_index);
if (ret < 0)
return ret;
/*
* Allocate an ASID for the kernel.
*/
ret = gxio_trio_alloc_asids(context, 1, 0, 0);
if (ret < 0) {
pr_err("PCI: ASID alloc failure on TRIO %d, give up\n",
trio_index);
goto asid_alloc_failure;
}
context->asid = ret;
#ifdef USE_SHARED_PCIE_CONFIG_REGION
/*
* Alloc a PIO region for config access, shared by all MACs per TRIO.
* This shouldn't fail since the kernel is supposed to the first
* client of the TRIO's PIO regions.
*/
ret = gxio_trio_alloc_pio_regions(context, 1, 0, 0);
if (ret < 0) {
pr_err("PCI: CFG PIO alloc failure on TRIO %d, give up\n",
trio_index);
goto pio_alloc_failure;
}
context->pio_cfg_index = ret;
/*
* For PIO CFG, the bus_address_hi parameter is 0. The mac parameter
* is also 0 because it is specified in PIO_REGION_SETUP_CFG_ADDR.
*/
ret = gxio_trio_init_pio_region_aux(context, context->pio_cfg_index,
0, 0, HV_TRIO_PIO_FLAG_CONFIG_SPACE);
if (ret < 0) {
pr_err("PCI: CFG PIO init failure on TRIO %d, give up\n",
trio_index);
goto pio_alloc_failure;
}
#endif
return ret;
asid_alloc_failure:
#ifdef USE_SHARED_PCIE_CONFIG_REGION
pio_alloc_failure:
#endif
hv_dev_close(context->fd);
return ret;
}
static void
tilegx_legacy_irq_ack(struct irq_data *d)
{
__insn_mtspr(SPR_IPI_EVENT_RESET_K, 1UL << d->irq);
}
static void
tilegx_legacy_irq_mask(struct irq_data *d)
{
__insn_mtspr(SPR_IPI_MASK_SET_K, 1UL << d->irq);
}
static void
tilegx_legacy_irq_unmask(struct irq_data *d)
{
__insn_mtspr(SPR_IPI_MASK_RESET_K, 1UL << d->irq);
}
static struct irq_chip tilegx_legacy_irq_chip = {
.name = "tilegx_legacy_irq",
.irq_ack = tilegx_legacy_irq_ack,
.irq_mask = tilegx_legacy_irq_mask,
.irq_unmask = tilegx_legacy_irq_unmask,
/* TBD: support set_affinity. */
};
/*
* This is a wrapper function of the kernel level-trigger interrupt
* handler handle_level_irq() for PCI legacy interrupts. The TRIO
* is configured such that only INTx Assert interrupts are proxied
* to Linux which just calls handle_level_irq() after clearing the
* MAC INTx Assert status bit associated with this interrupt.
*/
static void
trio_handle_level_irq(unsigned int irq, struct irq_desc *desc)
{
struct pci_controller *controller = irq_desc_get_handler_data(desc);
gxio_trio_context_t *trio_context = controller->trio;
uint64_t intx = (uint64_t)irq_desc_get_chip_data(desc);
int mac = controller->mac;
unsigned int reg_offset;
uint64_t level_mask;
handle_level_irq(irq, desc);
/*
* Clear the INTx Level status, otherwise future interrupts are
* not sent.
*/
reg_offset = (TRIO_PCIE_INTFC_MAC_INT_STS <<
TRIO_CFG_REGION_ADDR__REG_SHIFT) |
(TRIO_CFG_REGION_ADDR__INTFC_VAL_MAC_INTERFACE <<
TRIO_CFG_REGION_ADDR__INTFC_SHIFT ) |
(mac << TRIO_CFG_REGION_ADDR__MAC_SEL_SHIFT);
level_mask = TRIO_PCIE_INTFC_MAC_INT_STS__INT_LEVEL_MASK << intx;
__gxio_mmio_write(trio_context->mmio_base_mac + reg_offset, level_mask);
}
/*
* Create kernel irqs and set up the handlers for the legacy interrupts.
* Also some minimum initialization for the MSI support.
*/
static int tile_init_irqs(struct pci_controller *controller)
{
int i;
int j;
int irq;
int result;
cpumask_copy(&intr_cpus_map, cpu_online_mask);
for (i = 0; i < 4; i++) {
gxio_trio_context_t *context = controller->trio;
int cpu;
/* Ask the kernel to allocate an IRQ. */
irq = create_irq();
if (irq < 0) {
pr_err("PCI: no free irq vectors, failed for %d\n", i);
goto free_irqs;
}
controller->irq_intx_table[i] = irq;
/* Distribute the 4 IRQs to different tiles. */
cpu = tile_irq_cpu(irq);
/* Configure the TRIO intr binding for this IRQ. */
result = gxio_trio_config_legacy_intr(context, cpu_x(cpu),
cpu_y(cpu), KERNEL_PL,
irq, controller->mac, i);
if (result < 0) {
pr_err("PCI: MAC intx config failed for %d\n", i);
goto free_irqs;
}
/*
* Register the IRQ handler with the kernel.
*/
irq_set_chip_and_handler(irq, &tilegx_legacy_irq_chip,
trio_handle_level_irq);
irq_set_chip_data(irq, (void *)(uint64_t)i);
irq_set_handler_data(irq, controller);
}
return 0;
free_irqs:
for (j = 0; j < i; j++)
destroy_irq(controller->irq_intx_table[j]);
return -1;
}
/*
* Find valid controllers and fill in pci_controller structs for each
* of them.
*
* Returns the number of controllers discovered.
*/
int __init tile_pci_init(void)
{
int num_trio_shims = 0;
int ctl_index = 0;
int i, j;
if (!pci_probe) {
pr_info("PCI: disabled by boot argument\n");
return 0;
}
pr_info("PCI: Searching for controllers...\n");
/*
* We loop over all the TRIO shims.
*/
for (i = 0; i < TILEGX_NUM_TRIO; i++) {
int ret;
ret = tile_pcie_open(i);
if (ret < 0)
continue;
num_trio_shims++;
}
if (num_trio_shims == 0 || sim_is_simulator())
return 0;
/*
* Now determine which PCIe ports are configured to operate in RC mode.
* We look at the Board Information Block first and then see if there
* are any overriding configuration by the HW strapping pin.
*/
for (i = 0; i < TILEGX_NUM_TRIO; i++) {
gxio_trio_context_t *context = &trio_contexts[i];
int ret;
if (context->fd < 0)
continue;
ret = hv_dev_pread(context->fd, 0,
(HV_VirtAddr)&pcie_ports[i][0],
sizeof(struct pcie_port_property) * TILEGX_TRIO_PCIES,
GXIO_TRIO_OP_GET_PORT_PROPERTY);
if (ret < 0) {
pr_err("PCI: PCIE_GET_PORT_PROPERTY failure, error %d,"
" on TRIO %d\n", ret, i);
continue;
}
for (j = 0; j < TILEGX_TRIO_PCIES; j++) {
if (pcie_ports[i][j].allow_rc) {
pcie_rc[i][j] = 1;
num_rc_controllers++;
}
else if (pcie_ports[i][j].allow_ep) {
num_ep_controllers++;
}
}
}
/*
* Return if no PCIe ports are configured to operate in RC mode.
*/
if (num_rc_controllers == 0)
return 0;
/*
* Set the TRIO pointer and MAC index for each PCIe RC port.
*/
for (i = 0; i < TILEGX_NUM_TRIO; i++) {
for (j = 0; j < TILEGX_TRIO_PCIES; j++) {
if (pcie_rc[i][j]) {
pci_controllers[ctl_index].trio =
&trio_contexts[i];
pci_controllers[ctl_index].mac = j;
pci_controllers[ctl_index].trio_index = i;
ctl_index++;
if (ctl_index == num_rc_controllers)
goto out;
}
}
}
out:
/*
* Configure each PCIe RC port.
*/
for (i = 0; i < num_rc_controllers; i++) {
/*
* Configure the PCIe MAC to run in RC mode.
*/
struct pci_controller *controller = &pci_controllers[i];
controller->index = i;
controller->ops = &tile_cfg_ops;
/*
* The PCI memory resource is located above the PA space.
* For every host bridge, the BAR window or the MMIO aperture
* is in range [3GB, 4GB - 1] of a 4GB space beyond the
* PA space.
*/
controller->mem_offset = TILE_PCI_MEM_START +
(i * TILE_PCI_BAR_WINDOW_TOP);
controller->mem_space.start = controller->mem_offset +
TILE_PCI_BAR_WINDOW_TOP - TILE_PCI_BAR_WINDOW_SIZE;
controller->mem_space.end = controller->mem_offset +
TILE_PCI_BAR_WINDOW_TOP - 1;
controller->mem_space.flags = IORESOURCE_MEM;
snprintf(controller->mem_space_name,
sizeof(controller->mem_space_name),
"PCI mem domain %d", i);
controller->mem_space.name = controller->mem_space_name;
}
return num_rc_controllers;
}
/*
* (pin - 1) converts from the PCI standard's [1:4] convention to
* a normal [0:3] range.
*/
static int tile_map_irq(const struct pci_dev *dev, u8 device, u8 pin)
{
struct pci_controller *controller =
(struct pci_controller *)dev->sysdata;
return controller->irq_intx_table[pin - 1];
}
static void fixup_read_and_payload_sizes(struct pci_controller *controller)
{
gxio_trio_context_t *trio_context = controller->trio;
struct pci_bus *root_bus = controller->root_bus;
TRIO_PCIE_RC_DEVICE_CONTROL_t dev_control;
TRIO_PCIE_RC_DEVICE_CAP_t rc_dev_cap;
unsigned int reg_offset;
struct pci_bus *child;
int mac;
int err;
mac = controller->mac;
/*
* Set our max read request size to be 4KB.
*/
reg_offset =
(TRIO_PCIE_RC_DEVICE_CONTROL <<
TRIO_CFG_REGION_ADDR__REG_SHIFT) |
(TRIO_CFG_REGION_ADDR__INTFC_VAL_MAC_STANDARD <<
TRIO_CFG_REGION_ADDR__INTFC_SHIFT ) |
(mac << TRIO_CFG_REGION_ADDR__MAC_SEL_SHIFT);
dev_control.word = __gxio_mmio_read32(trio_context->mmio_base_mac +
reg_offset);
dev_control.max_read_req_sz = 5;
__gxio_mmio_write32(trio_context->mmio_base_mac + reg_offset,
dev_control.word);
/*
* Set the max payload size supported by this Gx PCIe MAC.
* Though Gx PCIe supports Max Payload Size of up to 1024 bytes,
* experiments have shown that setting MPS to 256 yields the
* best performance.
*/
reg_offset =
(TRIO_PCIE_RC_DEVICE_CAP <<
TRIO_CFG_REGION_ADDR__REG_SHIFT) |
(TRIO_CFG_REGION_ADDR__INTFC_VAL_MAC_STANDARD <<
TRIO_CFG_REGION_ADDR__INTFC_SHIFT ) |
(mac << TRIO_CFG_REGION_ADDR__MAC_SEL_SHIFT);
rc_dev_cap.word = __gxio_mmio_read32(trio_context->mmio_base_mac +
reg_offset);
rc_dev_cap.mps_sup = 1;
__gxio_mmio_write32(trio_context->mmio_base_mac + reg_offset,
rc_dev_cap.word);
/* Configure PCI Express MPS setting. */
list_for_each_entry(child, &root_bus->children, node) {
struct pci_dev *self = child->self;
if (!self)
continue;
pcie_bus_configure_settings(child, self->pcie_mpss);
}
/*
* Set the mac_config register in trio based on the MPS/MRS of the link.
*/
reg_offset =
(TRIO_PCIE_RC_DEVICE_CONTROL <<
TRIO_CFG_REGION_ADDR__REG_SHIFT) |
(TRIO_CFG_REGION_ADDR__INTFC_VAL_MAC_STANDARD <<
TRIO_CFG_REGION_ADDR__INTFC_SHIFT ) |
(mac << TRIO_CFG_REGION_ADDR__MAC_SEL_SHIFT);
dev_control.word = __gxio_mmio_read32(trio_context->mmio_base_mac +
reg_offset);
err = gxio_trio_set_mps_mrs(trio_context,
dev_control.max_payload_size,
dev_control.max_read_req_sz,
mac);
if (err < 0) {
pr_err("PCI: PCIE_CONFIGURE_MAC_MPS_MRS failure, "
"MAC %d on TRIO %d\n",
mac, controller->trio_index);
}
}
static int setup_pcie_rc_delay(char *str)
{
unsigned long delay = 0;
unsigned long trio_index;
unsigned long mac;
if (str == NULL || !isdigit(*str))
return -EINVAL;
trio_index = simple_strtoul(str, (char **)&str, 10);
if (trio_index >= TILEGX_NUM_TRIO)
return -EINVAL;
if (*str != ',')
return -EINVAL;
str++;
if (!isdigit(*str))
return -EINVAL;
mac = simple_strtoul(str, (char **)&str, 10);
if (mac >= TILEGX_TRIO_PCIES)
return -EINVAL;
if (*str != '\0') {
if (*str != ',')
return -EINVAL;
str++;
if (!isdigit(*str))
return -EINVAL;
delay = simple_strtoul(str, (char **)&str, 10);
if (delay > MAX_RC_DELAY)
return -EINVAL;
}
rc_delay[trio_index][mac] = delay ? : DEFAULT_RC_DELAY;
pr_info("Delaying PCIe RC link training for %u sec"
" on MAC %lu on TRIO %lu\n", rc_delay[trio_index][mac],
mac, trio_index);
return 0;
}
early_param("pcie_rc_delay", setup_pcie_rc_delay);
/*
* PCI initialization entry point, called by subsys_initcall.
*/
int __init pcibios_init(void)
{
resource_size_t offset;
LIST_HEAD(resources);
int next_busno;
int i;
tile_pci_init();
if (num_rc_controllers == 0 && num_ep_controllers == 0)
return 0;
/*
* We loop over all the TRIO shims and set up the MMIO mappings.
*/
for (i = 0; i < TILEGX_NUM_TRIO; i++) {
gxio_trio_context_t *context = &trio_contexts[i];
if (context->fd < 0)
continue;
/*
* Map in the MMIO space for the MAC.
*/
offset = 0;
context->mmio_base_mac =
iorpc_ioremap(context->fd, offset,
HV_TRIO_CONFIG_IOREMAP_SIZE);
if (context->mmio_base_mac == NULL) {
pr_err("PCI: MAC map failure on TRIO %d\n", i);
hv_dev_close(context->fd);
context->fd = -1;
continue;
}
}
/*
* Delay a bit in case devices aren't ready. Some devices are
* known to require at least 20ms here, but we use a more
* conservative value.
*/
msleep(250);
/* Scan all of the recorded PCI controllers. */
for (next_busno = 0, i = 0; i < num_rc_controllers; i++) {
struct pci_controller *controller = &pci_controllers[i];
gxio_trio_context_t *trio_context = controller->trio;
TRIO_PCIE_INTFC_PORT_CONFIG_t port_config;
TRIO_PCIE_INTFC_PORT_STATUS_t port_status;
TRIO_PCIE_INTFC_TX_FIFO_CTL_t tx_fifo_ctl;
struct pci_bus *bus;
unsigned int reg_offset;
unsigned int class_code_revision;
int trio_index;
int mac;
int ret;
if (trio_context->fd < 0)
continue;
trio_index = controller->trio_index;
mac = controller->mac;
/*
* Check the port strap state which will override the BIB
* setting.
*/
reg_offset =
(TRIO_PCIE_INTFC_PORT_CONFIG <<
TRIO_CFG_REGION_ADDR__REG_SHIFT) |
(TRIO_CFG_REGION_ADDR__INTFC_VAL_MAC_INTERFACE <<
TRIO_CFG_REGION_ADDR__INTFC_SHIFT ) |
(mac << TRIO_CFG_REGION_ADDR__MAC_SEL_SHIFT);
port_config.word =
__gxio_mmio_read(trio_context->mmio_base_mac +
reg_offset);
if ((port_config.strap_state !=
TRIO_PCIE_INTFC_PORT_CONFIG__STRAP_STATE_VAL_AUTO_CONFIG_RC) &&
(port_config.strap_state !=
TRIO_PCIE_INTFC_PORT_CONFIG__STRAP_STATE_VAL_AUTO_CONFIG_RC_G1)) {
/*
* If this is really intended to be an EP port,
* record it so that the endpoint driver will know about it.
*/
if (port_config.strap_state ==
TRIO_PCIE_INTFC_PORT_CONFIG__STRAP_STATE_VAL_AUTO_CONFIG_ENDPOINT ||
port_config.strap_state ==
TRIO_PCIE_INTFC_PORT_CONFIG__STRAP_STATE_VAL_AUTO_CONFIG_ENDPOINT_G1)
pcie_ports[trio_index][mac].allow_ep = 1;
continue;
}
/*
* Delay the RC link training if needed.
*/
if (rc_delay[trio_index][mac])
msleep(rc_delay[trio_index][mac] * 1000);
ret = gxio_trio_force_rc_link_up(trio_context, mac);
if (ret < 0)
pr_err("PCI: PCIE_FORCE_LINK_UP failure, "
"MAC %d on TRIO %d\n", mac, trio_index);
pr_info("PCI: Found PCI controller #%d on TRIO %d MAC %d\n", i,
trio_index, controller->mac);
/*
* Wait a bit here because some EP devices take longer
* to come up.
*/
msleep(1000);
/*
* Check for PCIe link-up status.
*/
reg_offset =
(TRIO_PCIE_INTFC_PORT_STATUS <<
TRIO_CFG_REGION_ADDR__REG_SHIFT) |
(TRIO_CFG_REGION_ADDR__INTFC_VAL_MAC_INTERFACE <<
TRIO_CFG_REGION_ADDR__INTFC_SHIFT ) |
(mac << TRIO_CFG_REGION_ADDR__MAC_SEL_SHIFT);
port_status.word =
__gxio_mmio_read(trio_context->mmio_base_mac +
reg_offset);
if (!port_status.dl_up) {
pr_err("PCI: link is down, MAC %d on TRIO %d\n",
mac, trio_index);
continue;
}
/*
* Ensure that the link can come out of L1 power down state.
* Strictly speaking, this is needed only in the case of
* heavy RC-initiated DMAs.
*/
reg_offset =
(TRIO_PCIE_INTFC_TX_FIFO_CTL <<
TRIO_CFG_REGION_ADDR__REG_SHIFT) |
(TRIO_CFG_REGION_ADDR__INTFC_VAL_MAC_INTERFACE <<
TRIO_CFG_REGION_ADDR__INTFC_SHIFT ) |
(mac << TRIO_CFG_REGION_ADDR__MAC_SEL_SHIFT);
tx_fifo_ctl.word =
__gxio_mmio_read(trio_context->mmio_base_mac +
reg_offset);
tx_fifo_ctl.min_p_credits = 0;
__gxio_mmio_write(trio_context->mmio_base_mac + reg_offset,
tx_fifo_ctl.word);
/*
* Change the device ID so that Linux bus crawl doesn't confuse
* the internal bridge with any Tilera endpoints.
*/
reg_offset =
(TRIO_PCIE_RC_DEVICE_ID_VEN_ID <<
TRIO_CFG_REGION_ADDR__REG_SHIFT) |
(TRIO_CFG_REGION_ADDR__INTFC_VAL_MAC_STANDARD <<
TRIO_CFG_REGION_ADDR__INTFC_SHIFT ) |
(mac << TRIO_CFG_REGION_ADDR__MAC_SEL_SHIFT);
__gxio_mmio_write32(trio_context->mmio_base_mac + reg_offset,
(TILERA_GX36_RC_DEV_ID <<
TRIO_PCIE_RC_DEVICE_ID_VEN_ID__DEV_ID_SHIFT) |
TILERA_VENDOR_ID);
/*
* Set the internal P2P bridge class code.
*/
reg_offset =
(TRIO_PCIE_RC_REVISION_ID <<
TRIO_CFG_REGION_ADDR__REG_SHIFT) |
(TRIO_CFG_REGION_ADDR__INTFC_VAL_MAC_STANDARD <<
TRIO_CFG_REGION_ADDR__INTFC_SHIFT ) |
(mac << TRIO_CFG_REGION_ADDR__MAC_SEL_SHIFT);
class_code_revision =
__gxio_mmio_read32(trio_context->mmio_base_mac +
reg_offset);
class_code_revision = (class_code_revision & 0xff ) |
(PCI_CLASS_BRIDGE_PCI << 16);
__gxio_mmio_write32(trio_context->mmio_base_mac +
reg_offset, class_code_revision);
#ifdef USE_SHARED_PCIE_CONFIG_REGION
/*
* Map in the MMIO space for the PIO region.
*/
offset = HV_TRIO_PIO_OFFSET(trio_context->pio_cfg_index) |
(((unsigned long long)mac) <<
TRIO_TILE_PIO_REGION_SETUP_CFG_ADDR__MAC_SHIFT);
#else
/*
* Alloc a PIO region for PCI config access per MAC.
*/
ret = gxio_trio_alloc_pio_regions(trio_context, 1, 0, 0);
if (ret < 0) {
pr_err("PCI: PCI CFG PIO alloc failure for mac %d "
"on TRIO %d, give up\n", mac, trio_index);
continue;
}
trio_context->pio_cfg_index[mac] = ret;
/*
* For PIO CFG, the bus_address_hi parameter is 0.
*/
ret = gxio_trio_init_pio_region_aux(trio_context,
trio_context->pio_cfg_index[mac],
mac, 0, HV_TRIO_PIO_FLAG_CONFIG_SPACE);
if (ret < 0) {
pr_err("PCI: PCI CFG PIO init failure for mac %d "
"on TRIO %d, give up\n", mac, trio_index);
continue;
}
offset = HV_TRIO_PIO_OFFSET(trio_context->pio_cfg_index[mac]) |
(((unsigned long long)mac) <<
TRIO_TILE_PIO_REGION_SETUP_CFG_ADDR__MAC_SHIFT);
#endif
trio_context->mmio_base_pio_cfg[mac] =
iorpc_ioremap(trio_context->fd, offset,
(1 << TRIO_TILE_PIO_REGION_SETUP_CFG_ADDR__MAC_SHIFT));
if (trio_context->mmio_base_pio_cfg[mac] == NULL) {
pr_err("PCI: PIO map failure for mac %d on TRIO %d\n",
mac, trio_index);
continue;
}
/*
* Initialize the PCIe interrupts.
*/
if (tile_init_irqs(controller)) {
pr_err("PCI: IRQs init failure for mac %d on TRIO %d\n",
mac, trio_index);
continue;
}
/*
* The PCI memory resource is located above the PA space.
* The memory range for the PCI root bus should not overlap
* with the physical RAM
*/
pci_add_resource_offset(&resources, &controller->mem_space,
controller->mem_offset);
controller->first_busno = next_busno;
bus = pci_scan_root_bus(NULL, next_busno, controller->ops,
controller, &resources);
controller->root_bus = bus;
next_busno = bus->busn_res.end + 1;
}
/* Do machine dependent PCI interrupt routing */
pci_fixup_irqs(pci_common_swizzle, tile_map_irq);
/*
* This comes from the generic Linux PCI driver.
*
* It allocates all of the resources (I/O memory, etc)
* associated with the devices read in above.
*/
pci_assign_unassigned_resources();
/* Record the I/O resources in the PCI controller structure. */
for (i = 0; i < num_rc_controllers; i++) {
struct pci_controller *controller = &pci_controllers[i];
gxio_trio_context_t *trio_context = controller->trio;
struct pci_bus *root_bus = pci_controllers[i].root_bus;
struct pci_bus *next_bus;
uint32_t bus_address_hi;
struct pci_dev *dev;
int ret;
int j;
/*
* Skip controllers that are not properly initialized or
* have down links.
*/
if (root_bus == NULL)
continue;
/* Configure the max_payload_size values for this domain. */
fixup_read_and_payload_sizes(controller);
list_for_each_entry(dev, &root_bus->devices, bus_list) {
/* Find the PCI host controller, ie. the 1st bridge. */
if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI &&
(PCI_SLOT(dev->devfn) == 0)) {
next_bus = dev->subordinate;
pci_controllers[i].mem_resources[0] =
*next_bus->resource[0];
pci_controllers[i].mem_resources[1] =
*next_bus->resource[1];
pci_controllers[i].mem_resources[2] =
*next_bus->resource[2];
break;
}
}
if (pci_controllers[i].mem_resources[1].flags & IORESOURCE_MEM)
bus_address_hi =
pci_controllers[i].mem_resources[1].start >> 32;
else if (pci_controllers[i].mem_resources[2].flags & IORESOURCE_PREFETCH)
bus_address_hi =
pci_controllers[i].mem_resources[2].start >> 32;
else {
/* This is unlikely. */
pr_err("PCI: no memory resources on TRIO %d mac %d\n",
controller->trio_index, controller->mac);
continue;
}
/*
* Alloc a PIO region for PCI memory access for each RC port.
*/
ret = gxio_trio_alloc_pio_regions(trio_context, 1, 0, 0);
if (ret < 0) {
pr_err("PCI: MEM PIO alloc failure on TRIO %d mac %d, "
"give up\n", controller->trio_index,
controller->mac);
continue;
}
controller->pio_mem_index = ret;
/*
* For PIO MEM, the bus_address_hi parameter is hard-coded 0
* because we always assign 32-bit PCI bus BAR ranges.
*/
ret = gxio_trio_init_pio_region_aux(trio_context,
controller->pio_mem_index,
controller->mac,
0,
0);
if (ret < 0) {
pr_err("PCI: MEM PIO init failure on TRIO %d mac %d, "
"give up\n", controller->trio_index,
controller->mac);
continue;
}
/*
* Configure a Mem-Map region for each memory controller so
* that Linux can map all of its PA space to the PCI bus.
* Use the IOMMU to handle hash-for-home memory.
*/
for_each_online_node(j) {
unsigned long start_pfn = node_start_pfn[j];
unsigned long end_pfn = node_end_pfn[j];
unsigned long nr_pages = end_pfn - start_pfn;
ret = gxio_trio_alloc_memory_maps(trio_context, 1, 0,
0);
if (ret < 0) {
pr_err("PCI: Mem-Map alloc failure on TRIO %d "
"mac %d for MC %d, give up\n",
controller->trio_index,
controller->mac, j);
goto alloc_mem_map_failed;
}
controller->mem_maps[j] = ret;
/*
* Initialize the Mem-Map and the I/O MMU so that all
* the physical memory can be accessed by the endpoint
* devices. The base bus address is set to the base CPA
* of this memory controller plus an offset (see pci.h).
* The region's base VA is set to the base CPA. The
* I/O MMU table essentially translates the CPA to
* the real PA. Implicitly, for node 0, we create
* a separate Mem-Map region that serves as the inbound
* window for legacy 32-bit devices. This is a direct
* map of the low 4GB CPA space.
*/
ret = gxio_trio_init_memory_map_mmu_aux(trio_context,
controller->mem_maps[j],
start_pfn << PAGE_SHIFT,
nr_pages << PAGE_SHIFT,
trio_context->asid,
controller->mac,
(start_pfn << PAGE_SHIFT) +
TILE_PCI_MEM_MAP_BASE_OFFSET,
j,
GXIO_TRIO_ORDER_MODE_UNORDERED);
if (ret < 0) {
pr_err("PCI: Mem-Map init failure on TRIO %d "
"mac %d for MC %d, give up\n",
controller->trio_index,
controller->mac, j);
goto alloc_mem_map_failed;
}
continue;
alloc_mem_map_failed:
break;
}
}
return 0;
}
subsys_initcall(pcibios_init);
/* Note: to be deleted after Linux 3.6 merge. */
void pcibios_fixup_bus(struct pci_bus *bus)
{
}
/*
* This can be called from the generic PCI layer, but doesn't need to
* do anything.
*/
char *pcibios_setup(char *str)
{
if (!strcmp(str, "off")) {
pci_probe = 0;
return NULL;
}
return str;
}
/*
* Enable memory address decoding, as appropriate, for the
* device described by the 'dev' struct. The I/O decoding
* is disabled, though the TILE-Gx supports I/O addressing.
*
* This is called from the generic PCI layer, and can be called
* for bridges or endpoints.
*/
int pcibios_enable_device(struct pci_dev *dev, int mask)
{
return pci_enable_resources(dev, mask);
}
/* Called for each device after PCI setup is done. */
static void pcibios_fixup_final(struct pci_dev *pdev)
{
set_dma_ops(&pdev->dev, gx_pci_dma_map_ops);
set_dma_offset(&pdev->dev, TILE_PCI_MEM_MAP_BASE_OFFSET);
pdev->dev.archdata.max_direct_dma_addr =
TILE_PCI_MAX_DIRECT_DMA_ADDRESS;
}
DECLARE_PCI_FIXUP_FINAL(PCI_ANY_ID, PCI_ANY_ID, pcibios_fixup_final);
/* Map a PCI MMIO bus address into VA space. */
void __iomem *ioremap(resource_size_t phys_addr, unsigned long size)
{
struct pci_controller *controller = NULL;
resource_size_t bar_start;
resource_size_t bar_end;
resource_size_t offset;
resource_size_t start;
resource_size_t end;
int trio_fd;
int i, j;
start = phys_addr;
end = phys_addr + size - 1;
/*
* In the following, each PCI controller's mem_resources[1]
* represents its (non-prefetchable) PCI memory resource and
* mem_resources[2] refers to its prefetchable PCI memory resource.
* By searching phys_addr in each controller's mem_resources[], we can
* determine the controller that should accept the PCI memory access.
*/
for (i = 0; i < num_rc_controllers; i++) {
/*
* Skip controllers that are not properly initialized or
* have down links.
*/
if (pci_controllers[i].root_bus == NULL)
continue;
for (j = 1; j < 3; j++) {
bar_start =
pci_controllers[i].mem_resources[j].start;
bar_end =
pci_controllers[i].mem_resources[j].end;
if ((start >= bar_start) && (end <= bar_end)) {
controller = &pci_controllers[i];
goto got_it;
}
}
}
if (controller == NULL)
return NULL;
got_it:
trio_fd = controller->trio->fd;
/* Convert the resource start to the bus address offset. */
start = phys_addr - controller->mem_offset;
offset = HV_TRIO_PIO_OFFSET(controller->pio_mem_index) + start;
/*
* We need to keep the PCI bus address's in-page offset in the VA.
*/
return iorpc_ioremap(trio_fd, offset, size) +
(phys_addr & (PAGE_SIZE - 1));
}
EXPORT_SYMBOL(ioremap);
void pci_iounmap(struct pci_dev *dev, void __iomem *addr)
{
iounmap(addr);
}
EXPORT_SYMBOL(pci_iounmap);
/****************************************************************
*
* Tile PCI config space read/write routines
*
****************************************************************/
/*
* These are the normal read and write ops
* These are expanded with macros from pci_bus_read_config_byte() etc.
*
* devfn is the combined PCI device & function.
*
* offset is in bytes, from the start of config space for the
* specified bus & device.
*/
static int tile_cfg_read(struct pci_bus *bus, unsigned int devfn, int offset,
int size, u32 *val)
{
struct pci_controller *controller = bus->sysdata;
gxio_trio_context_t *trio_context = controller->trio;
int busnum = bus->number & 0xff;
int device = PCI_SLOT(devfn);
int function = PCI_FUNC(devfn);
int config_type = 1;
TRIO_TILE_PIO_REGION_SETUP_CFG_ADDR_t cfg_addr;
void *mmio_addr;
/*
* Map all accesses to the local device on root bus into the
* MMIO space of the MAC. Accesses to the downstream devices
* go to the PIO space.
*/
if (pci_is_root_bus(bus)) {
if (device == 0) {
/*
* This is the internal downstream P2P bridge,
* access directly.
*/
unsigned int reg_offset;
reg_offset = ((offset & 0xFFF) <<
TRIO_CFG_REGION_ADDR__REG_SHIFT) |
(TRIO_CFG_REGION_ADDR__INTFC_VAL_MAC_PROTECTED
<< TRIO_CFG_REGION_ADDR__INTFC_SHIFT ) |
(controller->mac <<
TRIO_CFG_REGION_ADDR__MAC_SEL_SHIFT);
mmio_addr = trio_context->mmio_base_mac + reg_offset;
goto valid_device;
} else {
/*
* We fake an empty device for (device > 0),
* since there is only one device on bus 0.
*/
goto invalid_device;
}
}
/*
* Accesses to the directly attached device have to be
* sent as type-0 configs.
*/
if (busnum == (controller->first_busno + 1)) {
/*
* There is only one device off of our built-in P2P bridge.
*/
if (device != 0)
goto invalid_device;
config_type = 0;
}
cfg_addr.word = 0;
cfg_addr.reg_addr = (offset & 0xFFF);
cfg_addr.fn = function;
cfg_addr.dev = device;
cfg_addr.bus = busnum;
cfg_addr.type = config_type;
/*
* Note that we don't set the mac field in cfg_addr because the
* mapping is per port.
*/
mmio_addr = trio_context->mmio_base_pio_cfg[controller->mac] +
cfg_addr.word;
valid_device:
switch (size) {
case 4:
*val = __gxio_mmio_read32(mmio_addr);
break;
case 2:
*val = __gxio_mmio_read16(mmio_addr);
break;
case 1:
*val = __gxio_mmio_read8(mmio_addr);
break;
default:
return PCIBIOS_FUNC_NOT_SUPPORTED;
}
TRACE_CFG_RD(size, *val, busnum, device, function, offset);
return 0;
invalid_device:
switch (size) {
case 4:
*val = 0xFFFFFFFF;
break;
case 2:
*val = 0xFFFF;
break;
case 1:
*val = 0xFF;
break;
default:
return PCIBIOS_FUNC_NOT_SUPPORTED;
}
return 0;
}
/*
* See tile_cfg_read() for relevent comments.
* Note that "val" is the value to write, not a pointer to that value.
*/
static int tile_cfg_write(struct pci_bus *bus, unsigned int devfn, int offset,
int size, u32 val)
{
struct pci_controller *controller = bus->sysdata;
gxio_trio_context_t *trio_context = controller->trio;
int busnum = bus->number & 0xff;
int device = PCI_SLOT(devfn);
int function = PCI_FUNC(devfn);
int config_type = 1;
TRIO_TILE_PIO_REGION_SETUP_CFG_ADDR_t cfg_addr;
void *mmio_addr;
u32 val_32 = (u32)val;
u16 val_16 = (u16)val;
u8 val_8 = (u8)val;
/*
* Map all accesses to the local device on root bus into the
* MMIO space of the MAC. Accesses to the downstream devices
* go to the PIO space.
*/
if (pci_is_root_bus(bus)) {
if (device == 0) {
/*
* This is the internal downstream P2P bridge,
* access directly.
*/
unsigned int reg_offset;
reg_offset = ((offset & 0xFFF) <<
TRIO_CFG_REGION_ADDR__REG_SHIFT) |
(TRIO_CFG_REGION_ADDR__INTFC_VAL_MAC_PROTECTED
<< TRIO_CFG_REGION_ADDR__INTFC_SHIFT ) |
(controller->mac <<
TRIO_CFG_REGION_ADDR__MAC_SEL_SHIFT);
mmio_addr = trio_context->mmio_base_mac + reg_offset;
goto valid_device;
} else {
/*
* We fake an empty device for (device > 0),
* since there is only one device on bus 0.
*/
goto invalid_device;
}
}
/*
* Accesses to the directly attached device have to be
* sent as type-0 configs.
*/
if (busnum == (controller->first_busno + 1)) {
/*
* There is only one device off of our built-in P2P bridge.
*/
if (device != 0)
goto invalid_device;
config_type = 0;
}
cfg_addr.word = 0;
cfg_addr.reg_addr = (offset & 0xFFF);
cfg_addr.fn = function;
cfg_addr.dev = device;
cfg_addr.bus = busnum;
cfg_addr.type = config_type;
/*
* Note that we don't set the mac field in cfg_addr because the
* mapping is per port.
*/
mmio_addr = trio_context->mmio_base_pio_cfg[controller->mac] +
cfg_addr.word;
valid_device:
switch (size) {
case 4:
__gxio_mmio_write32(mmio_addr, val_32);
TRACE_CFG_WR(size, val_32, busnum, device, function, offset);
break;
case 2:
__gxio_mmio_write16(mmio_addr, val_16);
TRACE_CFG_WR(size, val_16, busnum, device, function, offset);
break;
case 1:
__gxio_mmio_write8(mmio_addr, val_8);
TRACE_CFG_WR(size, val_8, busnum, device, function, offset);
break;
default:
return PCIBIOS_FUNC_NOT_SUPPORTED;
}
invalid_device:
return 0;
}
static struct pci_ops tile_cfg_ops = {
.read = tile_cfg_read,
.write = tile_cfg_write,
};
/*
* MSI support starts here.
*/
static unsigned int
tilegx_msi_startup(struct irq_data *d)
{
if (d->msi_desc)
unmask_msi_irq(d);
return 0;
}
static void
tilegx_msi_ack(struct irq_data *d)
{
__insn_mtspr(SPR_IPI_EVENT_RESET_K, 1UL << d->irq);
}
static void
tilegx_msi_mask(struct irq_data *d)
{
mask_msi_irq(d);
__insn_mtspr(SPR_IPI_MASK_SET_K, 1UL << d->irq);
}
static void
tilegx_msi_unmask(struct irq_data *d)
{
__insn_mtspr(SPR_IPI_MASK_RESET_K, 1UL << d->irq);
unmask_msi_irq(d);
}
static struct irq_chip tilegx_msi_chip = {
.name = "tilegx_msi",
.irq_startup = tilegx_msi_startup,
.irq_ack = tilegx_msi_ack,
.irq_mask = tilegx_msi_mask,
.irq_unmask = tilegx_msi_unmask,
/* TBD: support set_affinity. */
};
int arch_setup_msi_irq(struct pci_dev *pdev, struct msi_desc *desc)
{
struct pci_controller *controller;
gxio_trio_context_t *trio_context;
struct msi_msg msg;
int default_irq;
uint64_t mem_map_base;
uint64_t mem_map_limit;
u64 msi_addr;
int mem_map;
int cpu;
int irq;
int ret;
irq = create_irq();
if (irq < 0)
return irq;
/*
* Since we use a 64-bit Mem-Map to accept the MSI write, we fail
* devices that are not capable of generating a 64-bit message address.
* These devices will fall back to using the legacy interrupts.
* Most PCIe endpoint devices do support 64-bit message addressing.
*/
if (desc->msi_attrib.is_64 == 0) {
dev_printk(KERN_INFO, &pdev->dev,
"64-bit MSI message address not supported, "
"falling back to legacy interrupts.\n");
ret = -ENOMEM;
goto is_64_failure;
}
default_irq = desc->msi_attrib.default_irq;
controller = irq_get_handler_data(default_irq);
BUG_ON(!controller);
trio_context = controller->trio;
/*
* Allocate the Mem-Map that will accept the MSI write and
* trigger the TILE-side interrupts.
*/
mem_map = gxio_trio_alloc_memory_maps(trio_context, 1, 0, 0);
if (mem_map < 0) {
dev_printk(KERN_INFO, &pdev->dev,
"%s Mem-Map alloc failure. "
"Failed to initialize MSI interrupts. "
"Falling back to legacy interrupts.\n",
desc->msi_attrib.is_msix ? "MSI-X" : "MSI");
ret = -ENOMEM;
goto msi_mem_map_alloc_failure;
}
/* We try to distribute different IRQs to different tiles. */
cpu = tile_irq_cpu(irq);
/*
* Now call up to the HV to configure the Mem-Map interrupt and
* set up the IPI binding.
*/
mem_map_base = MEM_MAP_INTR_REGIONS_BASE +
mem_map * MEM_MAP_INTR_REGION_SIZE;
mem_map_limit = mem_map_base + MEM_MAP_INTR_REGION_SIZE - 1;
ret = gxio_trio_config_msi_intr(trio_context, cpu_x(cpu), cpu_y(cpu),
KERNEL_PL, irq, controller->mac,
mem_map, mem_map_base, mem_map_limit,
trio_context->asid);
if (ret < 0) {
dev_printk(KERN_INFO, &pdev->dev, "HV MSI config failed.\n");
goto hv_msi_config_failure;
}
irq_set_msi_desc(irq, desc);
msi_addr = mem_map_base + TRIO_MAP_MEM_REG_INT3 - TRIO_MAP_MEM_REG_INT0;
msg.address_hi = msi_addr >> 32;
msg.address_lo = msi_addr & 0xffffffff;
msg.data = mem_map;
write_msi_msg(irq, &msg);
irq_set_chip_and_handler(irq, &tilegx_msi_chip, handle_level_irq);
irq_set_handler_data(irq, controller);
return 0;
hv_msi_config_failure:
/* Free mem-map */
msi_mem_map_alloc_failure:
is_64_failure:
destroy_irq(irq);
return ret;
}
void arch_teardown_msi_irq(unsigned int irq)
{
destroy_irq(irq);
}
