diff options
Diffstat (limited to 'arch/tile/kernel/pci_gx.c')
| -rw-r--r-- | arch/tile/kernel/pci_gx.c | 1527 |
1 files changed, 0 insertions, 1527 deletions
diff --git a/arch/tile/kernel/pci_gx.c b/arch/tile/kernel/pci_gx.c deleted file mode 100644 index 11425633b2d7..000000000000 --- a/arch/tile/kernel/pci_gx.c +++ /dev/null @@ -1,1527 +0,0 @@ -/* - * 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); -} |