drivers/bus/mips_cdmm.c

2  * Bus driver for MIPS Common Device Memory Map (CDMM).
21 #include <asm/cdmm.h>
122 	.name		= "cdmm",
132  * All the CDMM driver callbacks need to be executed on the appropriate CPU from
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
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
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
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()
239  * mips_cdmm_driver_unregister() - Unregister a CDMM driver.
240  * @drv:	CDMM driver information.
242  * Unregister a CDMM driver from the CDMM subsystem.
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
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.
285  * Returns:	Pointer to CDMM bus information for the current CPU.
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.
383 		/* If CDMM region is still set up, nothing to do */  in mips_cdmm_setup()
387 		 * The CDMM region isn't set up as expected, so it needs  in mips_cdmm_setup()
395 	/* If the CDMM region is already configured, inherit that setup */  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()
423 	pr_debug("cdmm%u: Enabling CDMM region at %pa\n",  in mips_cdmm_setup()
426 	/* Enable CDMM */  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
465 	void __iomem *cdmm;  in mips_cdmm_early_probe()  local
480 	cdmm = bus->regs;  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()
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
525 	cdmm = bus->regs;  in mips_cdmm_bus_discover()
529 	pr_info("cdmm%u discovery (%u blocks)\n", cpu, bus->drbs);  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()
560 		dev_set_name(&dev->dev, "cdmm%u-%u", cpu, id);  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
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()
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
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()