1 // SPDX-License-Identifier: GPL-2.0
3  * Copyright (C) 2014-2015 Broadcom Corporation
12 #include <linux/irqchip/irq-bcm2836.h>
34 #define OF_SECONDARY_BOOT	"secondary-boot-reg"
54 		return -ENXIO;  in scu_a9_enable()
61 		return -ENOENT;  in scu_a9_enable()
68 		return -ENOMEM;  in scu_a9_enable()
78 static u32 secondary_boot_addr_for(unsigned int cpu)  in secondary_boot_addr_for()  argument
81 	struct device_node *cpu_node = of_get_cpu_node(cpu, NULL);  in secondary_boot_addr_for()
84 		pr_err("Failed to find device tree node for CPU%u\n", cpu);  in secondary_boot_addr_for()
91 		pr_err("required secondary boot register not specified for CPU%u\n",  in secondary_boot_addr_for()
92 			cpu);  in secondary_boot_addr_for()
99 static int nsp_write_lut(unsigned int cpu)  in nsp_write_lut()  argument
103 	const u32 secondary_boot_addr = secondary_boot_addr_for(cpu);  in nsp_write_lut()
106 		return -EINVAL;  in nsp_write_lut()
111 		pr_warn("unable to ioremap SKU-ROM LUT register for cpu %u\n", cpu);  in nsp_write_lut()
112 		return -ENOMEM;  in nsp_write_lut()
134 		/* Update the CPU present map to reflect uniprocessor mode */  in bcm_smp_prepare_cpus()
135 		pr_warn("failed to enable A9 SCU - disabling SMP\n");  in bcm_smp_prepare_cpus()
151  * - Encode the (hardware) CPU id with the bottom bits of the secondary
153  * - Write that value into the secondary boot register.
154  * - Generate an event to wake up the secondary CPU(s).
155  * - Wait for the secondary boot register to be re-written, which
158 static int kona_boot_secondary(unsigned int cpu, struct task_struct *idle)  in kona_boot_secondary()  argument
166 	const u32 secondary_boot_addr = secondary_boot_addr_for(cpu);  in kona_boot_secondary()
168 	cpu_id = cpu_logical_map(cpu);  in kona_boot_secondary()
170 		pr_err("bad cpu id (%u > %u)\n", cpu_id, BOOT_ADDR_CPUID_MASK);  in kona_boot_secondary()
171 		return -EINVAL;  in kona_boot_secondary()
175 		return -EINVAL;  in kona_boot_secondary()
180 		pr_err("unable to map boot register for cpu %u\n", cpu_id);  in kona_boot_secondary()
181 		return -ENOMEM;  in kona_boot_secondary()
201 		timeout = local_clock() - start_clock > SECONDARY_TIMEOUT_NS;  in kona_boot_secondary()
208 	pr_err("timeout waiting for cpu %u to start\n", cpu_id);  in kona_boot_secondary()
210 	return -ENXIO;  in kona_boot_secondary()
213 /* Cluster Dormant Control command to bring CPU into a running state */
216 #define CDC_CMD_REG(cpu)	(CDC_CMD_OFFSET + 4*(cpu))  argument
220  * idle state. A command needs to be sent to the block to bring the CPU
223 static int bcm23550_boot_secondary(unsigned int cpu, struct task_struct *idle)  in bcm23550_boot_secondary()  argument
233 	name = "brcm,bcm23550-cdc";  in bcm23550_boot_secondary()
237 		return -ENODEV;  in bcm23550_boot_secondary()
245 		return -ENOMEM;  in bcm23550_boot_secondary()
249 	ret = kona_boot_secondary(cpu, idle);  in bcm23550_boot_secondary()
253 	/* Bring this CPU to RUN state so that nIRQ nFIQ  in bcm23550_boot_secondary()
256 	writel_relaxed(CDC_CMD, cdc_base + CDC_CMD_REG(cpu));  in bcm23550_boot_secondary()
264 static int nsp_boot_secondary(unsigned int cpu, struct task_struct *idle)  in nsp_boot_secondary()  argument
272 	ret = nsp_write_lut(cpu);  in nsp_boot_secondary()
278 	/* Send a CPU wakeup interrupt to the secondary core */  in nsp_boot_secondary()
279 	arch_send_wakeup_ipi_mask(cpumask_of(cpu));  in nsp_boot_secondary()
285 static int bcm2836_boot_secondary(unsigned int cpu, struct task_struct *idle)  in bcm2836_boot_secondary()  argument
291 	name = "brcm,bcm2836-l1-intc";  in bcm2836_boot_secondary()
295 		return -ENODEV;  in bcm2836_boot_secondary()
303 		return -ENOMEM;  in bcm2836_boot_secondary()
307 	       intc_base + LOCAL_MAILBOX3_SET0 + 16 * cpu);  in bcm2836_boot_secondary()
321 CPU_METHOD_OF_DECLARE(bcm_smp_bcm281xx, "brcm,bcm11351-cpu-method",
334 CPU_METHOD_OF_DECLARE(bcm_smp_nsp, "brcm,bcm-nsp-smp", &nsp_smp_ops);
339 CPU_METHOD_OF_DECLARE(bcm_smp_bcm2836, "brcm,bcm2836-smp", &bcm2836_smp_ops);