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>
63 /* The power off register for clusters are different from a80 and a83t */
70 /* R_CPUCFG registers, specific to sun8i-a83t */
110 	is_compatible = of_device_is_compatible(node, "arm,cortex-a15");  in sunxi_core_is_cortex_a15()
120 	/* control sequence from Allwinner A80 user manual v1.2 PRCM section */  in sunxi_cpu_power_switch_set()
164 		return -EINVAL;  in sunxi_cpu_powerup()
170 	/* assert processor power-on reset */  in sunxi_cpu_powerup()
176 		/* assert cpu power-on reset */  in sunxi_cpu_powerup()
185 	/* Cortex-A7: hold L1 reset disable signal low */  in sunxi_cpu_powerup()
198 	 * to ARM manuals, asserting power-on reset is sufficient.  in sunxi_cpu_powerup()
226 	/* de-assert processor power-on reset */  in sunxi_cpu_powerup()
240 	/* de-assert all processor resets */  in sunxi_cpu_powerup()
259 		return -EINVAL;  in sunxi_cluster_powerup()
274 	/* assert cluster processor power-on resets */  in sunxi_cluster_powerup()
298 	 * to ARM manuals, asserting power-on reset is sufficient.  in sunxi_cluster_powerup()
308 		/* Cortex-A15: hold L2RSTDISABLE low */  in sunxi_cluster_powerup()
311 		/* Cortex-A7: hold L1RSTDISABLE and L2RSTDISABLE low */  in sunxi_cluster_powerup()
326 	/* de-assert cluster resets */  in sunxi_cluster_powerup()
333 	/* de-assert ACINACTM */  in sunxi_cluster_powerup()
343  * enable CCI-400 and proper cluster cache disable before power down.
349 		 * On the Cortex-A15 we need to disable  in sunxi_cluster_cache_disable_without_axi()
363 	 * Disable cluster-level coherency by masking  in sunxi_cluster_cache_disable_without_axi()
400 		return -ENODEV;  in sunxi_mc_smp_boot_secondary()
402 		return -EINVAL;  in sunxi_mc_smp_boot_secondary()
454 	sunxi_mc_smp_cpu_table[cluster][cpu]--;  in sunxi_mc_smp_cpu_die()
487 		return -EINVAL;  in sunxi_cpu_powerdown()
510 		return -EINVAL;  in sunxi_cluster_powerdown()
610 	/* CPU0 hotplug not handled for sun8i-a83t */  in sunxi_mc_smp_cpu_can_disable()
647  * We need the trampoline code to enable CCI-400 on the first cluster
668 	 * We're going to soft-restart the current CPU through the  in sunxi_mc_smp_loopback()
669 	 * low-level MCPM code by leveraging the suspend/resume  in sunxi_mc_smp_loopback()
699 /* This structure holds SoC-specific bits tied to an enable-method string. */
708 	of_node_put(nodes->prcm_node);  in sunxi_mc_smp_put_nodes()
709 	of_node_put(nodes->cpucfg_node);  in sunxi_mc_smp_put_nodes()
710 	of_node_put(nodes->sram_node);  in sunxi_mc_smp_put_nodes()
711 	of_node_put(nodes->r_cpucfg_node);  in sunxi_mc_smp_put_nodes()
717 	nodes->prcm_node = of_find_compatible_node(NULL, NULL,  in sun9i_a80_get_smp_nodes()
718 						   "allwinner,sun9i-a80-prcm");  in sun9i_a80_get_smp_nodes()
719 	if (!nodes->prcm_node) {  in sun9i_a80_get_smp_nodes()
721 		return -ENODEV;  in sun9i_a80_get_smp_nodes()
724 	nodes->cpucfg_node = of_find_compatible_node(NULL, NULL,  in sun9i_a80_get_smp_nodes()
725 						     "allwinner,sun9i-a80-cpucfg");  in sun9i_a80_get_smp_nodes()
726 	if (!nodes->cpucfg_node) {  in sun9i_a80_get_smp_nodes()
728 		return -ENODEV;  in sun9i_a80_get_smp_nodes()
731 	nodes->sram_node = of_find_compatible_node(NULL, NULL,  in sun9i_a80_get_smp_nodes()
732 						   "allwinner,sun9i-a80-smp-sram");  in sun9i_a80_get_smp_nodes()
733 	if (!nodes->sram_node) {  in sun9i_a80_get_smp_nodes()
735 		return -ENODEV;  in sun9i_a80_get_smp_nodes()
743 	nodes->prcm_node = of_find_compatible_node(NULL, NULL,  in sun8i_a83t_get_smp_nodes()
744 						   "allwinner,sun8i-a83t-r-ccu");  in sun8i_a83t_get_smp_nodes()
745 	if (!nodes->prcm_node) {  in sun8i_a83t_get_smp_nodes()
747 		return -ENODEV;  in sun8i_a83t_get_smp_nodes()
750 	nodes->cpucfg_node = of_find_compatible_node(NULL, NULL,  in sun8i_a83t_get_smp_nodes()
751 						     "allwinner,sun8i-a83t-cpucfg");  in sun8i_a83t_get_smp_nodes()
752 	if (!nodes->cpucfg_node) {  in sun8i_a83t_get_smp_nodes()
754 		return -ENODEV;  in sun8i_a83t_get_smp_nodes()
757 	nodes->r_cpucfg_node = of_find_compatible_node(NULL, NULL,  in sun8i_a83t_get_smp_nodes()
758 						       "allwinner,sun8i-a83t-r-cpucfg");  in sun8i_a83t_get_smp_nodes()
759 	if (!nodes->r_cpucfg_node) {  in sun8i_a83t_get_smp_nodes()
761 		return -ENODEV;  in sun8i_a83t_get_smp_nodes()
769 		.enable_method	= "allwinner,sun9i-a80-smp",
773 		.enable_method	= "allwinner,sun8i-a83t-smp",
788 	 * Don't bother checking the "cpus" node, as an enable-method  in sunxi_mc_smp_init()
793 		return -ENODEV;  in sunxi_mc_smp_init()
796 	 * We can't actually use the enable-method magic in the kernel.  in sunxi_mc_smp_init()
804 		ret = of_property_match_string(node, "enable-method",  in sunxi_mc_smp_init()
812 		return -ENODEV;  in sunxi_mc_smp_init()
817 		return -EINVAL;  in sunxi_mc_smp_init()
820 		pr_err("%s: CCI-400 not available\n", __func__);  in sunxi_mc_smp_init()
821 		return -ENODEV;  in sunxi_mc_smp_init()
836 		ret = -ENOMEM;  in sunxi_mc_smp_init()
841 					    "sunxi-mc-smp");  in sunxi_mc_smp_init()
851 						      0, "sunxi-mc-smp");  in sunxi_mc_smp_init()
854 			pr_err("%s: failed to map R-CPUCFG registers\n",  in sunxi_mc_smp_init()
860 							"sunxi-mc-smp");  in sunxi_mc_smp_init()
868 	/* Configure CCI-400 for boot cluster */  in sunxi_mc_smp_init()