diff options
Diffstat (limited to 'arch/tile/kernel/pci_gx.c')
| -rw-r--r-- | arch/tile/kernel/pci_gx.c | 1610 |
1 files changed, 1610 insertions, 0 deletions
diff --git a/arch/tile/kernel/pci_gx.c b/arch/tile/kernel/pci_gx.c new file mode 100644 index 00000000000..e39f9c54280 --- /dev/null +++ b/arch/tile/kernel/pci_gx.c @@ -0,0 +1,1610 @@ +/* + * 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 argument is specified, but 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 + +/* The PCI I/O space size in each PCI domain. */ +#define IO_SPACE_SIZE 0x10000 + +/* Provide shorter versions of some very long constant names. */ +#define AUTO_CONFIG_RC \ + TRIO_PCIE_INTFC_PORT_CONFIG__STRAP_STATE_VAL_AUTO_CONFIG_RC +#define AUTO_CONFIG_RC_G1 \ + TRIO_PCIE_INTFC_PORT_CONFIG__STRAP_STATE_VAL_AUTO_CONFIG_RC_G1 +#define AUTO_CONFIG_EP \ + TRIO_PCIE_INTFC_PORT_CONFIG__STRAP_STATE_VAL_AUTO_CONFIG_ENDPOINT +#define AUTO_CONFIG_EP_G1 \ + TRIO_PCIE_INTFC_PORT_CONFIG__STRAP_STATE_VAL_AUTO_CONFIG_ENDPOINT_G1 + +/* Array of the PCIe ports configuration info obtained from the BIB. */ +struct pcie_trio_ports_property pcie_ports[TILEGX_NUM_TRIO]; + +/* Number of configured TRIO instances. */ +int num_trio_shims; + +/* 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 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; + int mac; + + /* This opens a file descriptor to the TRIO shim. */ + ret = gxio_trio_init(context, trio_index); + if (ret < 0) + goto gxio_trio_init_failure; + + /* 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 + + /* Get the properties of the PCIe ports on this TRIO instance. */ + ret = gxio_trio_get_port_property(context, &pcie_ports[trio_index]); + if (ret < 0) { + pr_err("PCI: PCIE_GET_PORT_PROPERTY failure, error %d," + " on TRIO %d\n", ret, trio_index); + goto get_port_property_failure; + } + + context->mmio_base_mac = + iorpc_ioremap(context->fd, 0, HV_TRIO_CONFIG_IOREMAP_SIZE); + if (context->mmio_base_mac == NULL) { + pr_err("PCI: TRIO config space mapping failure, error %d," + " on TRIO %d\n", ret, trio_index); + ret = -ENOMEM; + + goto trio_mmio_mapping_failure; + } + + /* Check the port strap state which will override the BIB setting. */ + for (mac = 0; mac < TILEGX_TRIO_PCIES; mac++) { + TRIO_PCIE_INTFC_PORT_CONFIG_t port_config; + unsigned int reg_offset; + + /* Ignore ports that are not specified in the BIB. */ + if (!pcie_ports[trio_index].ports[mac].allow_rc && + !pcie_ports[trio_index].ports[mac].allow_ep) + continue; + + 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(context->mmio_base_mac + reg_offset); + + if (port_config.strap_state != AUTO_CONFIG_RC && + port_config.strap_state != 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 == AUTO_CONFIG_EP || + port_config.strap_state == AUTO_CONFIG_EP_G1) + pcie_ports[trio_index].ports[mac].allow_ep = 1; + } + } + + return ret; + +trio_mmio_mapping_failure: +get_port_property_failure: +asid_alloc_failure: +#ifdef USE_SHARED_PCIE_CONFIG_REGION +pio_alloc_failure: +#endif + hv_dev_close(context->fd); +gxio_trio_init_failure: + context->fd = -1; + + return ret; +} + +static int __init tile_trio_init(void) +{ + int i; + + /* We loop over all the TRIO shims. */ + for (i = 0; i < TILEGX_NUM_TRIO; i++) { + if (tile_pcie_open(i) < 0) + continue; + num_trio_shims++; + } + + return 0; +} +postcore_initcall(tile_trio_init); + +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 = irq_alloc_hwirq(-1); + if (!irq) { + 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++) + irq_free_hwirq(controller->irq_intx_table[j]); + + return -1; +} + +/* + * Return 1 if the port is strapped to operate in RC mode. + */ +static int +strapped_for_rc(gxio_trio_context_t *trio_context, int mac) +{ + TRIO_PCIE_INTFC_PORT_CONFIG_t port_config; + unsigned int reg_offset; + + /* Check the port configuration. */ + 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 == AUTO_CONFIG_RC || + port_config.strap_state == AUTO_CONFIG_RC_G1) + return 1; + else + return 0; +} + +/* + * Find valid controllers and fill in pci_controller structs for each + * of them. + * + * Return the number of controllers discovered. + */ +int __init tile_pci_init(void) +{ + 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"); + + if (num_trio_shims == 0 || sim_is_simulator()) + return 0; + + /* + * Now determine which PCIe ports are configured to operate in RC + * mode. There is a differece in the port configuration capability + * between the Gx36 and Gx72 devices. + * + * The Gx36 has configuration capability for each of the 3 PCIe + * interfaces (disable, auto endpoint, auto RC, etc.). + * On the Gx72, you can only select one of the 3 PCIe interfaces per + * TRIO to train automatically. Further, the allowable training modes + * are reduced to four options (auto endpoint, auto RC, stream x1, + * stream x4). + * + * For Gx36 ports, it must be allowed to be in RC mode by the + * Board Information Block, and the hardware strapping pins must be + * set to RC mode. + * + * For Gx72 ports, the port will operate in RC mode if either of the + * following is true: + * 1. It is allowed to be in RC mode by the Board Information Block, + * and the BIB doesn't allow the EP mode. + * 2. It is allowed to be in either the RC or the EP mode by the BIB, + * and the hardware strapping pin is set to RC mode. + */ + for (i = 0; i < TILEGX_NUM_TRIO; i++) { + gxio_trio_context_t *context = &trio_contexts[i]; + + if (context->fd < 0) + continue; + + for (j = 0; j < TILEGX_TRIO_PCIES; j++) { + int is_rc = 0; + + if (pcie_ports[i].is_gx72 && + pcie_ports[i].ports[j].allow_rc) { + if (!pcie_ports[i].ports[j].allow_ep || + strapped_for_rc(context, j)) + is_rc = 1; + } else if (pcie_ports[i].ports[j].allow_rc && + strapped_for_rc(context, j)) { + is_rc = 1; + } + if (is_rc) { + pcie_rc[i][j] = 1; + num_rc_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; + + controller->io_space.start = PCIBIOS_MIN_IO + + (i * IO_SPACE_SIZE); + controller->io_space.end = controller->io_space.start + + IO_SPACE_SIZE - 1; + BUG_ON(controller->io_space.end > IO_SPACE_LIMIT); + controller->io_space.flags = IORESOURCE_IO; + snprintf(controller->io_space_name, + sizeof(controller->io_space_name), + "PCI I/O domain %d", i); + controller->io_space.name = controller->io_space_name; + + /* + * 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) + pcie_bus_configure_settings(child); + + /* + * 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); + } + + rc_delay[trio_index][mac] = delay ? : DEFAULT_RC_DELAY; + 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) + return 0; + + /* + * 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_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 for PCIe link-up status to decide if we need + * to force the link to come up. + */ + 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) { + if (rc_delay[trio_index][mac]) { + pr_info("Delaying PCIe RC TRIO init %d sec" + " on MAC %d on TRIO %d\n", + rc_delay[trio_index][mac], mac, + trio_index); + 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); + + /* Delay the bus probe if needed. */ + if (rc_delay[trio_index][mac]) { + pr_info("Delaying PCIe RC bus enumerating %d sec" + " on MAC %d on TRIO %d\n", + rc_delay[trio_index][mac], mac, + trio_index); + msleep(rc_delay[trio_index][mac] * 1000); + } else { + /* + * Wait a bit here because some EP devices + * take longer to come up. + */ + msleep(1000); + } + + /* Check for PCIe link-up status again. */ + port_status.word = + __gxio_mmio_read(trio_context->mmio_base_mac + + reg_offset); + if (!port_status.dl_up) { + if (pcie_ports[trio_index].ports[mac].removable) { + pr_info("PCI: link is down, MAC %d on TRIO %d\n", + mac, trio_index); + pr_info("This is expected if no PCIe card" + " is connected to this link\n"); + } else + 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 + + /* + * To save VMALLOC space, we take advantage of the fact that + * bit 29 in the PIO CFG address format is reserved 0. With + * TRIO_TILE_PIO_REGION_SETUP_CFG_ADDR__MAC_SHIFT being 30, + * this cuts VMALLOC space usage from 1GB to 512MB per mac. + */ + trio_context->mmio_base_pio_cfg[mac] = + iorpc_ioremap(trio_context->fd, offset, (1UL << + (TRIO_TILE_PIO_REGION_SETUP_CFG_ADDR__MAC_SHIFT - 1))); + 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); + pci_add_resource(&resources, &controller->io_space); + 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; + 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); + + /* 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; + } + +#ifdef CONFIG_TILE_PCI_IO + /* + * Alloc a PIO region for PCI I/O space access for each RC port. + */ + ret = gxio_trio_alloc_pio_regions(trio_context, 1, 0, 0); + if (ret < 0) { + pr_err("PCI: I/O PIO alloc failure on TRIO %d mac %d, " + "give up\n", controller->trio_index, + controller->mac); + + continue; + } + + controller->pio_io_index = ret; + + /* + * For PIO IO, the bus_address_hi parameter is hard-coded 0 + * because PCI I/O address space is 32-bit. + */ + ret = gxio_trio_init_pio_region_aux(trio_context, + controller->pio_io_index, + controller->mac, + 0, + HV_TRIO_PIO_FLAG_IO_SPACE); + if (ret < 0) { + pr_err("PCI: I/O PIO init failure on TRIO %d mac %d, " + "give up\n", controller->trio_index, + controller->mac); + + continue; + } +#endif + + /* + * 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); + +/* No bus fixups needed. */ +void pcibios_fixup_bus(struct pci_bus *bus) +{ +} + +/* Process any "pci=" kernel boot arguments. */ +char *__init pcibios_setup(char *str) +{ + if (!strcmp(str, "off")) { + pci_probe = 0; + return NULL; + } + return str; +} + +/* + * Called for each device after PCI setup is done. + * We initialize the PCI device capabilities conservatively, assuming that + * all devices can only address the 32-bit DMA space. The exception here is + * that the device dma_offset is set to the value that matches the 64-bit + * capable devices. This is OK because dma_offset is not used by legacy + * dma_ops, nor by the hybrid dma_ops's streaming DMAs, which are 64-bit ops. + * This implementation matches the kernel design of setting PCI devices' + * coherent_dma_mask to 0xffffffffull by default, allowing the device drivers + * to skip calling pci_set_consistent_dma_mask(DMA_BIT_MASK(32)). + */ +static void pcibios_fixup_final(struct pci_dev *pdev) +{ + set_dma_ops(&pdev->dev, gx_legacy_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; + pdev->dev.coherent_dma_mask = 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; + + start = phys_addr; + end = phys_addr + size - 1; + + /* + * By searching phys_addr in each controller's mem_space, 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; + + bar_start = pci_controllers[i].mem_space.start; + bar_end = pci_controllers[i].mem_space.end; + + if ((start >= bar_start) && (end <= bar_end)) { + controller = &pci_controllers[i]; + break; + } + } + + if (controller == NULL) + return NULL; + + 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) + + (start & (PAGE_SIZE - 1)); +} +EXPORT_SYMBOL(ioremap); + +#ifdef CONFIG_TILE_PCI_IO +/* Map a PCI I/O address into VA space. */ +void __iomem *ioport_map(unsigned long port, unsigned int 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; + + start = port; + end = port + size - 1; + + /* + * By searching the port in each controller's io_space, we can + * determine the controller that should accept the PCI I/O 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; + + bar_start = pci_controllers[i].io_space.start; + bar_end = pci_controllers[i].io_space.end; + + if ((start >= bar_start) && (end <= bar_end)) { + controller = &pci_controllers[i]; + break; + } + } + + if (controller == NULL) + return NULL; + + trio_fd = controller->trio->fd; + + /* Convert the resource start to the bus address offset. */ + port -= controller->io_space.start; + + offset = HV_TRIO_PIO_OFFSET(controller->pio_io_index) + port; + + /* We need to keep the PCI bus address's in-page offset in the VA. */ + return iorpc_ioremap(trio_fd, offset, size) + (port & (PAGE_SIZE - 1)); +} +EXPORT_SYMBOL(ioport_map); + +void ioport_unmap(void __iomem *addr) +{ + iounmap(addr); +} +EXPORT_SYMBOL(ioport_unmap); +#endif + +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 = irq_alloc_hwirq(-1); + if (!irq) + return -ENOSPC; + + /* + * 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 a scatter-queue that will accept the MSI write and + * trigger the TILE-side interrupts. We use the scatter-queue regions + * before the mem map regions, because the latter are needed by more + * applications. + */ + mem_map = gxio_trio_alloc_scatter_queues(trio_context, 1, 0, 0); + if (mem_map >= 0) { + TRIO_MAP_SQ_DOORBELL_FMT_t doorbell_template = {{ + .pop = 0, + .doorbell = 1, + }}; + + mem_map += TRIO_NUM_MAP_MEM_REGIONS; + 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; + + msi_addr = mem_map_base + MEM_MAP_INTR_REGION_SIZE - 8; + msg.data = (unsigned int)doorbell_template.word; + } else { + /* SQ regions are out, allocate from map mem regions. */ + 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; + } + + 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; + + msi_addr = mem_map_base + TRIO_MAP_MEM_REG_INT3 - + TRIO_MAP_MEM_REG_INT0; + + msg.data = mem_map; + } + + /* We try to distribute different IRQs to different tiles. */ + cpu = tile_irq_cpu(irq); + + /* + * Now call up to the HV to configure the MSI interrupt and + * set up the IPI binding. + */ + 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); + + msg.address_hi = msi_addr >> 32; + msg.address_lo = msi_addr & 0xffffffff; + + 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: + irq_free_hwirq(irq); + return ret; +} + +void arch_teardown_msi_irq(unsigned int irq) +{ + irq_free_hwirq(irq); +} |