diff options
Diffstat (limited to 'drivers/staging/fsl-mc/bus/dprc-driver.c')
| -rw-r--r-- | drivers/staging/fsl-mc/bus/dprc-driver.c | 333 |
1 files changed, 326 insertions, 7 deletions
diff --git a/drivers/staging/fsl-mc/bus/dprc-driver.c b/drivers/staging/fsl-mc/bus/dprc-driver.c index 2c4cd70b4cbb..31488a7b9e86 100644 --- a/drivers/staging/fsl-mc/bus/dprc-driver.c +++ b/drivers/staging/fsl-mc/bus/dprc-driver.c @@ -13,6 +13,8 @@ #include "../include/mc-sys.h" #include <linux/module.h> #include <linux/slab.h> +#include <linux/interrupt.h> +#include <linux/msi.h> #include "dprc-cmd.h" struct dprc_child_objs { @@ -127,7 +129,7 @@ static void check_plugged_state_change(struct fsl_mc_device *mc_dev, { int error; u32 plugged_flag_at_mc = - (obj_desc->state & DPRC_OBJ_STATE_PLUGGED); + obj_desc->state & DPRC_OBJ_STATE_PLUGGED; if (plugged_flag_at_mc != (mc_dev->obj_desc.state & DPRC_OBJ_STATE_PLUGGED)) { @@ -241,6 +243,7 @@ static void dprc_cleanup_all_resource_pools(struct fsl_mc_device *mc_bus_dev) * dprc_scan_objects - Discover objects in a DPRC * * @mc_bus_dev: pointer to the fsl-mc device that represents a DPRC object + * @total_irq_count: total number of IRQs needed by objects in the DPRC. * * Detects objects added and removed from a DPRC and synchronizes the * state of the Linux bus driver, MC by adding and removing @@ -254,11 +257,13 @@ static void dprc_cleanup_all_resource_pools(struct fsl_mc_device *mc_bus_dev) * populated before they can get allocation requests from probe callbacks * of the device drivers for the non-allocatable devices. */ -int dprc_scan_objects(struct fsl_mc_device *mc_bus_dev) +int dprc_scan_objects(struct fsl_mc_device *mc_bus_dev, + unsigned int *total_irq_count) { int num_child_objects; int dprc_get_obj_failures; int error; + unsigned int irq_count = mc_bus_dev->obj_desc.irq_count; struct dprc_obj_desc *child_obj_desc_array = NULL; error = dprc_get_obj_count(mc_bus_dev->mc_io, @@ -307,6 +312,7 @@ int dprc_scan_objects(struct fsl_mc_device *mc_bus_dev) continue; } + irq_count += obj_desc->irq_count; dev_dbg(&mc_bus_dev->dev, "Discovered object: type %s, id %d\n", obj_desc->type, obj_desc->id); @@ -319,6 +325,7 @@ int dprc_scan_objects(struct fsl_mc_device *mc_bus_dev) } } + *total_irq_count = irq_count; dprc_remove_devices(mc_bus_dev, child_obj_desc_array, num_child_objects); @@ -344,6 +351,7 @@ EXPORT_SYMBOL_GPL(dprc_scan_objects); int dprc_scan_container(struct fsl_mc_device *mc_bus_dev) { int error; + unsigned int irq_count; struct fsl_mc_bus *mc_bus = to_fsl_mc_bus(mc_bus_dev); dprc_init_all_resource_pools(mc_bus_dev); @@ -352,11 +360,25 @@ int dprc_scan_container(struct fsl_mc_device *mc_bus_dev) * Discover objects in the DPRC: */ mutex_lock(&mc_bus->scan_mutex); - error = dprc_scan_objects(mc_bus_dev); + error = dprc_scan_objects(mc_bus_dev, &irq_count); mutex_unlock(&mc_bus->scan_mutex); if (error < 0) goto error; + if (dev_get_msi_domain(&mc_bus_dev->dev) && !mc_bus->irq_resources) { + if (irq_count > FSL_MC_IRQ_POOL_MAX_TOTAL_IRQS) { + dev_warn(&mc_bus_dev->dev, + "IRQs needed (%u) exceed IRQs preallocated (%u)\n", + irq_count, FSL_MC_IRQ_POOL_MAX_TOTAL_IRQS); + } + + error = fsl_mc_populate_irq_pool( + mc_bus, + FSL_MC_IRQ_POOL_MAX_TOTAL_IRQS); + if (error < 0) + goto error; + } + return 0; error: dprc_cleanup_all_resource_pools(mc_bus_dev); @@ -365,6 +387,230 @@ error: EXPORT_SYMBOL_GPL(dprc_scan_container); /** + * dprc_irq0_handler - Regular ISR for DPRC interrupt 0 + * + * @irq: IRQ number of the interrupt being handled + * @arg: Pointer to device structure + */ +static irqreturn_t dprc_irq0_handler(int irq_num, void *arg) +{ + return IRQ_WAKE_THREAD; +} + +/** + * dprc_irq0_handler_thread - Handler thread function for DPRC interrupt 0 + * + * @irq: IRQ number of the interrupt being handled + * @arg: Pointer to device structure + */ +static irqreturn_t dprc_irq0_handler_thread(int irq_num, void *arg) +{ + int error; + u32 status; + struct device *dev = arg; + struct fsl_mc_device *mc_dev = to_fsl_mc_device(dev); + struct fsl_mc_bus *mc_bus = to_fsl_mc_bus(mc_dev); + struct fsl_mc_io *mc_io = mc_dev->mc_io; + struct msi_desc *msi_desc = mc_dev->irqs[0]->msi_desc; + + dev_dbg(dev, "DPRC IRQ %d triggered on CPU %u\n", + irq_num, smp_processor_id()); + + if (WARN_ON(!(mc_dev->flags & FSL_MC_IS_DPRC))) + return IRQ_HANDLED; + + mutex_lock(&mc_bus->scan_mutex); + if (WARN_ON(!msi_desc || msi_desc->irq != (u32)irq_num)) + goto out; + + error = dprc_get_irq_status(mc_io, 0, mc_dev->mc_handle, 0, + &status); + if (error < 0) { + dev_err(dev, + "dprc_get_irq_status() failed: %d\n", error); + goto out; + } + + error = dprc_clear_irq_status(mc_io, 0, mc_dev->mc_handle, 0, + status); + if (error < 0) { + dev_err(dev, + "dprc_clear_irq_status() failed: %d\n", error); + goto out; + } + + if (status & (DPRC_IRQ_EVENT_OBJ_ADDED | + DPRC_IRQ_EVENT_OBJ_REMOVED | + DPRC_IRQ_EVENT_CONTAINER_DESTROYED | + DPRC_IRQ_EVENT_OBJ_DESTROYED | + DPRC_IRQ_EVENT_OBJ_CREATED)) { + unsigned int irq_count; + + error = dprc_scan_objects(mc_dev, &irq_count); + if (error < 0) { + /* + * If the error is -ENXIO, we ignore it, as it indicates + * that the object scan was aborted, as we detected that + * an object was removed from the DPRC in the MC, while + * we were scanning the DPRC. + */ + if (error != -ENXIO) { + dev_err(dev, "dprc_scan_objects() failed: %d\n", + error); + } + + goto out; + } + + if (irq_count > FSL_MC_IRQ_POOL_MAX_TOTAL_IRQS) { + dev_warn(dev, + "IRQs needed (%u) exceed IRQs preallocated (%u)\n", + irq_count, FSL_MC_IRQ_POOL_MAX_TOTAL_IRQS); + } + } + +out: + mutex_unlock(&mc_bus->scan_mutex); + return IRQ_HANDLED; +} + +/* + * Disable and clear interrupt for a given DPRC object + */ +static int disable_dprc_irq(struct fsl_mc_device *mc_dev) +{ + int error; + struct fsl_mc_io *mc_io = mc_dev->mc_io; + + WARN_ON(mc_dev->obj_desc.irq_count != 1); + + /* + * Disable generation of interrupt, while we configure it: + */ + error = dprc_set_irq_enable(mc_io, 0, mc_dev->mc_handle, 0, 0); + if (error < 0) { + dev_err(&mc_dev->dev, + "Disabling DPRC IRQ failed: dprc_set_irq_enable() failed: %d\n", + error); + return error; + } + + /* + * Disable all interrupt causes for the interrupt: + */ + error = dprc_set_irq_mask(mc_io, 0, mc_dev->mc_handle, 0, 0x0); + if (error < 0) { + dev_err(&mc_dev->dev, + "Disabling DPRC IRQ failed: dprc_set_irq_mask() failed: %d\n", + error); + return error; + } + + /* + * Clear any leftover interrupts: + */ + error = dprc_clear_irq_status(mc_io, 0, mc_dev->mc_handle, 0, ~0x0U); + if (error < 0) { + dev_err(&mc_dev->dev, + "Disabling DPRC IRQ failed: dprc_clear_irq_status() failed: %d\n", + error); + return error; + } + + return 0; +} + +static int register_dprc_irq_handler(struct fsl_mc_device *mc_dev) +{ + int error; + struct fsl_mc_device_irq *irq = mc_dev->irqs[0]; + + WARN_ON(mc_dev->obj_desc.irq_count != 1); + + /* + * NOTE: devm_request_threaded_irq() invokes the device-specific + * function that programs the MSI physically in the device + */ + error = devm_request_threaded_irq(&mc_dev->dev, + irq->msi_desc->irq, + dprc_irq0_handler, + dprc_irq0_handler_thread, + IRQF_NO_SUSPEND | IRQF_ONESHOT, + "FSL MC DPRC irq0", + &mc_dev->dev); + if (error < 0) { + dev_err(&mc_dev->dev, + "devm_request_threaded_irq() failed: %d\n", + error); + return error; + } + + return 0; +} + +static int enable_dprc_irq(struct fsl_mc_device *mc_dev) +{ + int error; + + /* + * Enable all interrupt causes for the interrupt: + */ + error = dprc_set_irq_mask(mc_dev->mc_io, 0, mc_dev->mc_handle, 0, + ~0x0u); + if (error < 0) { + dev_err(&mc_dev->dev, + "Enabling DPRC IRQ failed: dprc_set_irq_mask() failed: %d\n", + error); + + return error; + } + + /* + * Enable generation of the interrupt: + */ + error = dprc_set_irq_enable(mc_dev->mc_io, 0, mc_dev->mc_handle, 0, 1); + if (error < 0) { + dev_err(&mc_dev->dev, + "Enabling DPRC IRQ failed: dprc_set_irq_enable() failed: %d\n", + error); + + return error; + } + + return 0; +} + +/* + * Setup interrupt for a given DPRC device + */ +static int dprc_setup_irq(struct fsl_mc_device *mc_dev) +{ + int error; + + error = fsl_mc_allocate_irqs(mc_dev); + if (error < 0) + return error; + + error = disable_dprc_irq(mc_dev); + if (error < 0) + goto error_free_irqs; + + error = register_dprc_irq_handler(mc_dev); + if (error < 0) + goto error_free_irqs; + + error = enable_dprc_irq(mc_dev); + if (error < 0) + goto error_free_irqs; + + return 0; + +error_free_irqs: + fsl_mc_free_irqs(mc_dev); + return error; +} + +/** * dprc_probe - callback invoked when a DPRC is being bound to this driver * * @mc_dev: Pointer to fsl-mc device representing a DPRC @@ -378,15 +624,24 @@ static int dprc_probe(struct fsl_mc_device *mc_dev) { int error; size_t region_size; + struct device *parent_dev = mc_dev->dev.parent; struct fsl_mc_bus *mc_bus = to_fsl_mc_bus(mc_dev); + bool mc_io_created = false; + bool msi_domain_set = false; if (WARN_ON(strcmp(mc_dev->obj_desc.type, "dprc") != 0)) return -EINVAL; + if (WARN_ON(dev_get_msi_domain(&mc_dev->dev))) + return -EINVAL; + if (!mc_dev->mc_io) { /* * This is a child DPRC: */ + if (WARN_ON(parent_dev->bus != &fsl_mc_bus_type)) + return -EINVAL; + if (WARN_ON(mc_dev->obj_desc.region_count == 0)) return -EINVAL; @@ -396,16 +651,45 @@ static int dprc_probe(struct fsl_mc_device *mc_dev) error = fsl_create_mc_io(&mc_dev->dev, mc_dev->regions[0].start, region_size, - NULL, 0, &mc_dev->mc_io); + NULL, + FSL_MC_IO_ATOMIC_CONTEXT_PORTAL, + &mc_dev->mc_io); if (error < 0) return error; + + mc_io_created = true; + + /* + * Inherit parent MSI domain: + */ + dev_set_msi_domain(&mc_dev->dev, + dev_get_msi_domain(parent_dev)); + msi_domain_set = true; + } else { + /* + * This is a root DPRC + */ + struct irq_domain *mc_msi_domain; + + if (WARN_ON(parent_dev->bus == &fsl_mc_bus_type)) + return -EINVAL; + + error = fsl_mc_find_msi_domain(parent_dev, + &mc_msi_domain); + if (error < 0) { + dev_warn(&mc_dev->dev, + "WARNING: MC bus without interrupt support\n"); + } else { + dev_set_msi_domain(&mc_dev->dev, mc_msi_domain); + msi_domain_set = true; + } } error = dprc_open(mc_dev->mc_io, 0, mc_dev->obj_desc.id, &mc_dev->mc_handle); if (error < 0) { dev_err(&mc_dev->dev, "dprc_open() failed: %d\n", error); - goto error_cleanup_mc_io; + goto error_cleanup_msi_domain; } mutex_init(&mc_bus->scan_mutex); @@ -417,17 +701,40 @@ static int dprc_probe(struct fsl_mc_device *mc_dev) if (error < 0) goto error_cleanup_open; + /* + * Configure interrupt for the DPRC object associated with this MC bus: + */ + error = dprc_setup_irq(mc_dev); + if (error < 0) + goto error_cleanup_open; + dev_info(&mc_dev->dev, "DPRC device bound to driver"); return 0; error_cleanup_open: (void)dprc_close(mc_dev->mc_io, 0, mc_dev->mc_handle); -error_cleanup_mc_io: - fsl_destroy_mc_io(mc_dev->mc_io); +error_cleanup_msi_domain: + if (msi_domain_set) + dev_set_msi_domain(&mc_dev->dev, NULL); + + if (mc_io_created) { + fsl_destroy_mc_io(mc_dev->mc_io); + mc_dev->mc_io = NULL; + } + return error; } +/* + * Tear down interrupt for a given DPRC object + */ +static void dprc_teardown_irq(struct fsl_mc_device *mc_dev) +{ + (void)disable_dprc_irq(mc_dev); + fsl_mc_free_irqs(mc_dev); +} + /** * dprc_remove - callback invoked when a DPRC is being unbound from this driver * @@ -441,18 +748,30 @@ error_cleanup_mc_io: static int dprc_remove(struct fsl_mc_device *mc_dev) { int error; + struct fsl_mc_bus *mc_bus = to_fsl_mc_bus(mc_dev); if (WARN_ON(strcmp(mc_dev->obj_desc.type, "dprc") != 0)) return -EINVAL; if (WARN_ON(!mc_dev->mc_io)) return -EINVAL; + if (WARN_ON(!mc_bus->irq_resources)) + return -EINVAL; + + if (dev_get_msi_domain(&mc_dev->dev)) + dprc_teardown_irq(mc_dev); + device_for_each_child(&mc_dev->dev, NULL, __fsl_mc_device_remove); dprc_cleanup_all_resource_pools(mc_dev); error = dprc_close(mc_dev->mc_io, 0, mc_dev->mc_handle); if (error < 0) dev_err(&mc_dev->dev, "dprc_close() failed: %d\n", error); + if (dev_get_msi_domain(&mc_dev->dev)) { + fsl_mc_cleanup_irq_pool(mc_bus); + dev_set_msi_domain(&mc_dev->dev, NULL); + } + dev_info(&mc_dev->dev, "DPRC device unbound from driver"); return 0; } |