Lines Matching +full:mips +full:- +full:cdmm
2 * Bus driver for MIPS Common Device Memory Map (CDMM).
4 * Copyright (C) 2014-2015 Imagination Technologies Ltd.
21 #include <asm/cdmm.h>
53 for (; table->type; ++table) { in mips_cdmm_lookup()
54 ret = (dev->type == table->type); in mips_cdmm_lookup()
67 return mips_cdmm_lookup(cdrv->id_table, cdev) != NULL; in mips_cdmm_match()
75 retval = add_uevent_var(env, "CDMM_CPU=%u", cdev->cpu); in mips_cdmm_uevent()
79 retval = add_uevent_var(env, "CDMM_TYPE=0x%02x", cdev->type); in mips_cdmm_uevent()
83 retval = add_uevent_var(env, "CDMM_REV=%u", cdev->rev); in mips_cdmm_uevent()
87 retval = add_uevent_var(env, "MODALIAS=mipscdmm:t%02X", cdev->type); in mips_cdmm_uevent()
102 CDMM_ATTR(cpu, "%u\n", dev->cpu);
103 CDMM_ATTR(type, "0x%02x\n", dev->type);
104 CDMM_ATTR(revision, "%u\n", dev->rev);
105 CDMM_ATTR(modalias, "mipscdmm:t%02X\n", dev->type);
107 (unsigned long long)dev->res.start,
108 (unsigned long long)dev->res.end,
109 dev->res.flags);
122 .name = "cdmm",
132 * All the CDMM driver callbacks need to be executed on the appropriate CPU from
140 * struct mips_cdmm_work_dev - Data for per-device call work.
141 * @fn: CDMM driver callback function to call for the device.
142 * @dev: CDMM device to pass to @fn.
150 * mips_cdmm_void_work() - Call a void returning CDMM driver callback.
153 * A work_on_cpu() callback function to call an arbitrary CDMM driver callback
159 void (*fn)(struct mips_cdmm_device *) = work->fn; in mips_cdmm_void_work()
161 fn(work->dev); in mips_cdmm_void_work()
166 * mips_cdmm_int_work() - Call an int returning CDMM driver callback.
169 * A work_on_cpu() callback function to call an arbitrary CDMM driver callback
175 int (*fn)(struct mips_cdmm_device *) = work->fn; in mips_cdmm_int_work()
177 return fn(work->dev); in mips_cdmm_int_work()
184 * BUILD_PERCPU_HELPER() - Helper to call a CDMM driver callback on right CPU.
186 * @_name: Name of CDMM driver callback function.
188 * Generates a specific device callback function to call a CDMM driver callback
196 struct mips_cdmm_driver *cdrv = to_mips_cdmm_driver(dev->driver); \
198 .fn = cdrv->_name, \
202 _BUILD_RET_##_ret work_on_cpu(cdev->cpu, \
215 * mips_cdmm_driver_register() - Register a CDMM driver. in BUILD_PERCPU_HELPER()
216 * @drv: CDMM driver information. in BUILD_PERCPU_HELPER()
218 * Register a CDMM driver with the CDMM subsystem. The driver will be informed in BUILD_PERCPU_HELPER()
225 drv->drv.bus = &mips_cdmm_bustype; in BUILD_PERCPU_HELPER()
227 if (drv->probe) in BUILD_PERCPU_HELPER()
228 drv->drv.probe = mips_cdmm_probe; in BUILD_PERCPU_HELPER()
229 if (drv->remove) in BUILD_PERCPU_HELPER()
230 drv->drv.remove = mips_cdmm_remove; in BUILD_PERCPU_HELPER()
231 if (drv->shutdown) in BUILD_PERCPU_HELPER()
232 drv->drv.shutdown = mips_cdmm_shutdown; in BUILD_PERCPU_HELPER()
234 return driver_register(&drv->drv); in BUILD_PERCPU_HELPER()
239 * mips_cdmm_driver_unregister() - Unregister a CDMM driver.
240 * @drv: CDMM driver information.
242 * Unregister a CDMM driver from the CDMM subsystem.
246 driver_unregister(&drv->drv); in mips_cdmm_driver_unregister()
251 /* CDMM initialisation and bus discovery */
254 * struct mips_cdmm_bus - Info about CDMM bus.
260 * @offline: Whether the CDMM bus is going offline (or very early
275 static atomic_t mips_cdmm_next_id = ATOMIC_INIT(-1);
278 * mips_cdmm_get_bus() - Get the per-CPU CDMM bus information.
280 * Get information about the per-CPU CDMM bus, if the bus is present.
283 * pre-emption or by running from a pinned kernel thread.
285 * Returns: Pointer to CDMM bus information for the current CPU.
286 * May return ERR_PTR(-errno) in case of error, so check with
296 return ERR_PTR(-ENODEV); in mips_cdmm_get_bus()
299 /* Avoid early use of per-cpu primitives before initialised */ in mips_cdmm_get_bus()
311 bus = ERR_PTR(-ENOMEM); in mips_cdmm_get_bus()
320 * mips_cdmm_cur_base() - Find current physical base address of CDMM region.
322 * Returns: Physical base address of CDMM region according to cdmmbase CP0
323 * register, or 0 if the CDMM region is disabled.
337 * mips_cdmm_phys_base() - Choose a physical base address for CDMM region.
339 * Picking a suitable physical address at which to map the CDMM region is
342 * By default this method tries to find a CDMM-specific node in the system
351 np = of_find_compatible_node(NULL, NULL, "mti,mips-cdmm"); in mips_cdmm_phys_base()
363 * mips_cdmm_setup() - Ensure the CDMM bus is initialised and usable.
368 * pre-emption or by running from a pinned kernel thread.
370 * Returns 0 on success, -errno on failure.
382 if (bus->offline) { in mips_cdmm_setup()
383 /* If CDMM region is still set up, nothing to do */ in mips_cdmm_setup()
384 if (bus->phys == mips_cdmm_cur_base()) in mips_cdmm_setup()
387 * The CDMM region isn't set up as expected, so it needs in mips_cdmm_setup()
390 bus->offline = false; in mips_cdmm_setup()
391 } else if (bus->phys > 1) { in mips_cdmm_setup()
395 /* If the CDMM region is already configured, inherit that setup */ in mips_cdmm_setup()
396 if (!bus->phys) in mips_cdmm_setup()
397 bus->phys = mips_cdmm_cur_base(); in mips_cdmm_setup()
399 if (!bus->phys) in mips_cdmm_setup()
400 bus->phys = mips_cdmm_phys_base(); in mips_cdmm_setup()
402 if (!bus->phys) in mips_cdmm_setup()
403 bus->phys = mips_cdmm_default_base; in mips_cdmm_setup()
405 if (!bus->phys) { in mips_cdmm_setup()
406 bus->phys = 1; in mips_cdmm_setup()
409 * CDMM on the boot CPU, or else you need to implement in mips_cdmm_setup()
410 * mips_cdmm_phys_base() for your platform (see asm/cdmm.h). in mips_cdmm_setup()
412 pr_err("cdmm%u: Failed to choose a physical base\n", in mips_cdmm_setup()
416 if (bus->phys == 1) { in mips_cdmm_setup()
417 ret = -ENOMEM; in mips_cdmm_setup()
421 mips_cdmm_default_base = bus->phys; in mips_cdmm_setup()
423 pr_debug("cdmm%u: Enabling CDMM region at %pa\n", in mips_cdmm_setup()
424 smp_processor_id(), &bus->phys); in mips_cdmm_setup()
426 /* Enable CDMM */ in mips_cdmm_setup()
428 cdmmbase &= (1ul << MIPS_CDMMBASE_ADDR_SHIFT) - 1; in mips_cdmm_setup()
429 cdmmbase |= (bus->phys >> MIPS_CDMMBASE_ADDR_START) in mips_cdmm_setup()
435 bus->regs = (void __iomem *)CKSEG1ADDR(bus->phys); in mips_cdmm_setup()
436 bus->drbs = 1 + ((cdmmbase & MIPS_CDMMBASE_SIZE) >> in mips_cdmm_setup()
438 bus->drbs_reserved = !!(cdmmbase & MIPS_CDMMBASE_CI); in mips_cdmm_setup()
446 * mips_cdmm_early_probe() - Minimally probe for a specific device on CDMM.
447 * @dev_type: CDMM type code to look for.
449 * Minimally configure the in-CPU Common Device Memory Map (CDMM) and look for a
454 * pre-emption or by running from a pinned kernel thread.
459 * May return IOMEM_ERR_PTR(-errno) in case of error, so check with
465 void __iomem *cdmm; in mips_cdmm_early_probe() local
471 return IOMEM_ERR_PTR(-ENODEV); in mips_cdmm_early_probe()
479 drb = bus->drbs_reserved; in mips_cdmm_early_probe()
480 cdmm = bus->regs; in mips_cdmm_early_probe()
483 for (; drb < bus->drbs; drb += size + 1) { in mips_cdmm_early_probe()
484 acsr = __raw_readl(cdmm + drb * CDMM_DRB_SIZE); in mips_cdmm_early_probe()
487 return cdmm + drb * CDMM_DRB_SIZE; in mips_cdmm_early_probe()
491 return IOMEM_ERR_PTR(-ENODEV); in mips_cdmm_early_probe()
496 * mips_cdmm_release() - Release a removed CDMM device.
499 * Clean up the struct mips_cdmm_device for an unused CDMM device. This is
510 * mips_cdmm_bus_discover() - Discover the devices on the CDMM bus.
511 * @bus: CDMM bus information, must already be set up.
515 void __iomem *cdmm; in mips_cdmm_bus_discover() local
524 drb = bus->drbs_reserved; in mips_cdmm_bus_discover()
525 cdmm = bus->regs; in mips_cdmm_bus_discover()
528 bus->discovered = true; in mips_cdmm_bus_discover()
529 pr_info("cdmm%u discovery (%u blocks)\n", cpu, bus->drbs); in mips_cdmm_bus_discover()
530 for (; drb < bus->drbs; drb += size + 1) { in mips_cdmm_bus_discover()
531 acsr = __raw_readl(cdmm + drb * CDMM_DRB_SIZE); in mips_cdmm_bus_discover()
539 pr_info("cdmm%u-%u: @%u (%#x..%#x), type 0x%02x, rev %u\n", in mips_cdmm_bus_discover()
541 (drb + size + 1) * CDMM_DRB_SIZE - 1, in mips_cdmm_bus_discover()
548 dev->cpu = cpu; in mips_cdmm_bus_discover()
549 dev->res.start = bus->phys + drb * CDMM_DRB_SIZE; in mips_cdmm_bus_discover()
550 dev->res.end = bus->phys + in mips_cdmm_bus_discover()
551 (drb + size + 1) * CDMM_DRB_SIZE - 1; in mips_cdmm_bus_discover()
552 dev->res.flags = IORESOURCE_MEM; in mips_cdmm_bus_discover()
553 dev->type = type; in mips_cdmm_bus_discover()
554 dev->rev = rev; in mips_cdmm_bus_discover()
555 dev->dev.parent = get_cpu_device(cpu); in mips_cdmm_bus_discover()
556 dev->dev.bus = &mips_cdmm_bustype; in mips_cdmm_bus_discover()
557 dev->dev.id = atomic_inc_return(&mips_cdmm_next_id); in mips_cdmm_bus_discover()
558 dev->dev.release = mips_cdmm_release; in mips_cdmm_bus_discover()
560 dev_set_name(&dev->dev, "cdmm%u-%u", cpu, id); in mips_cdmm_bus_discover()
562 ret = device_register(&dev->dev); in mips_cdmm_bus_discover()
564 put_device(&dev->dev); in mips_cdmm_bus_discover()
572 * All the CDMM driver callbacks need to be executed on the appropriate CPU from
580 * BUILD_PERDEV_HELPER() - Helper to call a CDMM driver callback if CPU matches.
581 * @_name: Name of CDMM driver callback function.
583 * Generates a bus_for_each_dev callback function to call a specific CDMM driver
599 if (cdev->cpu != cpu || !dev->driver) \
602 cdrv = to_mips_cdmm_driver(dev->driver); \
603 if (!cdrv->_name) \
605 return cdrv->_name(cdev); \
613 * mips_cdmm_cpu_down_prep() - Callback for CPUHP DOWN_PREP: in BUILD_PERDEV_HELPER()
614 * Tear down the CDMM bus. in BUILD_PERDEV_HELPER()
617 * This function is executed on the hotplugged CPU and calls the CDMM in BUILD_PERDEV_HELPER()
635 bus->offline = true; in BUILD_PERDEV_HELPER()
641 * mips_cdmm_cpu_online() - Callback for CPUHP ONLINE: Bring up the CDMM bus.
645 * CDMM devices on that CPU, or to call the CDMM driver cpu_up callback for all
663 bus->offline = false; in mips_cdmm_cpu_online()
665 if (!bus->discovered) in mips_cdmm_cpu_online()
676 * mips_cdmm_init() - Initialise CDMM bus.
678 * Initialise CDMM bus, discover CDMM devices for online CPUs, and arrange for
679 * hotplug notifications so the CDMM drivers can be kept up to date.
691 ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "bus/cdmm:online", in mips_cdmm_init()
694 pr_warn("cdmm: Failed to register CPU notifier\n"); in mips_cdmm_init()