1 // SPDX-License-Identifier: GPL-2.0
3  * Copyright (c) 2018 Chen-Yu Tsai
5  * Chen-Yu Tsai <wens@csie.org>
7  * arch/arm/mach-sunxi/mc_smp.c
9  * Based on Allwinner code, arch/arm/mach-exynos/mcpm-exynos.c, and
10  * arch/arm/mach-hisi/platmcpm.c
14 #include <linux/arm-cci.h>
19 #include <linux/irqchip/arm-gic.h>
64 /* The power off register for clusters are different from a80 and a83t */
71 /* R_CPUCFG registers, specific to sun8i-a83t */
111 	is_compatible = of_device_is_compatible(node, "arm,cortex-a15");  in sunxi_core_is_cortex_a15()
121 	/* control sequence from Allwinner A80 user manual v1.2 PRCM section */  in sunxi_cpu_power_switch_set()
165 		return -EINVAL;  in sunxi_cpu_powerup()
171 	/* assert processor power-on reset */  in sunxi_cpu_powerup()
177 		/* assert cpu power-on reset */  in sunxi_cpu_powerup()
186 	/* Cortex-A7: hold L1 reset disable signal low */  in sunxi_cpu_powerup()
199 	 * to ARM manuals, asserting power-on reset is sufficient.  in sunxi_cpu_powerup()
227 	/* de-assert processor power-on reset */  in sunxi_cpu_powerup()
241 	/* de-assert all processor resets */  in sunxi_cpu_powerup()
260 		return -EINVAL;  in sunxi_cluster_powerup()
275 	/* assert cluster processor power-on resets */  in sunxi_cluster_powerup()
299 	 * to ARM manuals, asserting power-on reset is sufficient.  in sunxi_cluster_powerup()
309 		/* Cortex-A15: hold L2RSTDISABLE low */  in sunxi_cluster_powerup()
312 		/* Cortex-A7: hold L1RSTDISABLE and L2RSTDISABLE low */  in sunxi_cluster_powerup()
327 	/* de-assert cluster resets */  in sunxi_cluster_powerup()
334 	/* de-assert ACINACTM */  in sunxi_cluster_powerup()
344  * enable CCI-400 and proper cluster cache disable before power down.
350 		 * On the Cortex-A15 we need to disable  in sunxi_cluster_cache_disable_without_axi()
364 	 * Disable cluster-level coherency by masking  in sunxi_cluster_cache_disable_without_axi()
401 		return -ENODEV;  in sunxi_mc_smp_boot_secondary()
403 		return -EINVAL;  in sunxi_mc_smp_boot_secondary()
455 	sunxi_mc_smp_cpu_table[cluster][cpu]--;  in sunxi_mc_smp_cpu_die()
488 		return -EINVAL;  in sunxi_cpu_powerdown()
511 		return -EINVAL;  in sunxi_cluster_powerdown()
611 	/* CPU0 hotplug not handled for sun8i-a83t */  in sunxi_mc_smp_cpu_can_disable()
648  * We need the trampoline code to enable CCI-400 on the first cluster
669 	 * We're going to soft-restart the current CPU through the  in sunxi_mc_smp_loopback()
670 	 * low-level MCPM code by leveraging the suspend/resume  in sunxi_mc_smp_loopback()
700 /* This structure holds SoC-specific bits tied to an enable-method string. */
709 	of_node_put(nodes->prcm_node);  in sunxi_mc_smp_put_nodes()
710 	of_node_put(nodes->cpucfg_node);  in sunxi_mc_smp_put_nodes()
711 	of_node_put(nodes->sram_node);  in sunxi_mc_smp_put_nodes()
712 	of_node_put(nodes->r_cpucfg_node);  in sunxi_mc_smp_put_nodes()
718 	nodes->prcm_node = of_find_compatible_node(NULL, NULL,  in sun9i_a80_get_smp_nodes()
719 						   "allwinner,sun9i-a80-prcm");  in sun9i_a80_get_smp_nodes()
720 	if (!nodes->prcm_node) {  in sun9i_a80_get_smp_nodes()
722 		return -ENODEV;  in sun9i_a80_get_smp_nodes()
725 	nodes->cpucfg_node = of_find_compatible_node(NULL, NULL,  in sun9i_a80_get_smp_nodes()
726 						     "allwinner,sun9i-a80-cpucfg");  in sun9i_a80_get_smp_nodes()
727 	if (!nodes->cpucfg_node) {  in sun9i_a80_get_smp_nodes()
729 		return -ENODEV;  in sun9i_a80_get_smp_nodes()
732 	nodes->sram_node = of_find_compatible_node(NULL, NULL,  in sun9i_a80_get_smp_nodes()
733 						   "allwinner,sun9i-a80-smp-sram");  in sun9i_a80_get_smp_nodes()
734 	if (!nodes->sram_node) {  in sun9i_a80_get_smp_nodes()
736 		return -ENODEV;  in sun9i_a80_get_smp_nodes()
744 	nodes->prcm_node = of_find_compatible_node(NULL, NULL,  in sun8i_a83t_get_smp_nodes()
745 						   "allwinner,sun8i-a83t-r-ccu");  in sun8i_a83t_get_smp_nodes()
746 	if (!nodes->prcm_node) {  in sun8i_a83t_get_smp_nodes()
748 		return -ENODEV;  in sun8i_a83t_get_smp_nodes()
751 	nodes->cpucfg_node = of_find_compatible_node(NULL, NULL,  in sun8i_a83t_get_smp_nodes()
752 						     "allwinner,sun8i-a83t-cpucfg");  in sun8i_a83t_get_smp_nodes()
753 	if (!nodes->cpucfg_node) {  in sun8i_a83t_get_smp_nodes()
755 		return -ENODEV;  in sun8i_a83t_get_smp_nodes()
758 	nodes->r_cpucfg_node = of_find_compatible_node(NULL, NULL,  in sun8i_a83t_get_smp_nodes()
759 						       "allwinner,sun8i-a83t-r-cpucfg");  in sun8i_a83t_get_smp_nodes()
760 	if (!nodes->r_cpucfg_node) {  in sun8i_a83t_get_smp_nodes()
762 		return -ENODEV;  in sun8i_a83t_get_smp_nodes()
770 		.enable_method	= "allwinner,sun9i-a80-smp",
774 		.enable_method	= "allwinner,sun8i-a83t-smp",
789 	 * Don't bother checking the "cpus" node, as an enable-method  in sunxi_mc_smp_init()
794 		return -ENODEV;  in sunxi_mc_smp_init()
797 	 * We can't actually use the enable-method magic in the kernel.  in sunxi_mc_smp_init()
805 		ret = of_property_match_string(node, "enable-method",  in sunxi_mc_smp_init()
815 		return -ENODEV;  in sunxi_mc_smp_init()
818 		return -EINVAL;  in sunxi_mc_smp_init()
821 		pr_err("%s: CCI-400 not available\n", __func__);  in sunxi_mc_smp_init()
822 		return -ENODEV;  in sunxi_mc_smp_init()
837 		ret = -ENOMEM;  in sunxi_mc_smp_init()
842 					    "sunxi-mc-smp");  in sunxi_mc_smp_init()
852 						      0, "sunxi-mc-smp");  in sunxi_mc_smp_init()
855 			pr_err("%s: failed to map R-CPUCFG registers\n",  in sunxi_mc_smp_init()
861 							"sunxi-mc-smp");  in sunxi_mc_smp_init()
869 	/* Configure CCI-400 for boot cluster */  in sunxi_mc_smp_init()