xref: /openbmc/linux/arch/arm/mach-hisi/platmcpm.c (revision b593bce5)
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright (c) 2013-2014 Linaro Ltd.
4  * Copyright (c) 2013-2014 Hisilicon Limited.
5  */
6 #include <linux/init.h>
7 #include <linux/smp.h>
8 #include <linux/delay.h>
9 #include <linux/io.h>
10 #include <linux/memblock.h>
11 #include <linux/of_address.h>
12 
13 #include <asm/cputype.h>
14 #include <asm/cp15.h>
15 #include <asm/cacheflush.h>
16 #include <asm/smp.h>
17 #include <asm/smp_plat.h>
18 
19 #include "core.h"
20 
21 /* bits definition in SC_CPU_RESET_REQ[x]/SC_CPU_RESET_DREQ[x]
22  * 1 -- unreset; 0 -- reset
23  */
24 #define CORE_RESET_BIT(x)		(1 << x)
25 #define NEON_RESET_BIT(x)		(1 << (x + 4))
26 #define CORE_DEBUG_RESET_BIT(x)		(1 << (x + 9))
27 #define CLUSTER_L2_RESET_BIT		(1 << 8)
28 #define CLUSTER_DEBUG_RESET_BIT		(1 << 13)
29 
30 /*
31  * bits definition in SC_CPU_RESET_STATUS[x]
32  * 1 -- reset status; 0 -- unreset status
33  */
34 #define CORE_RESET_STATUS(x)		(1 << x)
35 #define NEON_RESET_STATUS(x)		(1 << (x + 4))
36 #define CORE_DEBUG_RESET_STATUS(x)	(1 << (x + 9))
37 #define CLUSTER_L2_RESET_STATUS		(1 << 8)
38 #define CLUSTER_DEBUG_RESET_STATUS	(1 << 13)
39 #define CORE_WFI_STATUS(x)		(1 << (x + 16))
40 #define CORE_WFE_STATUS(x)		(1 << (x + 20))
41 #define CORE_DEBUG_ACK(x)		(1 << (x + 24))
42 
43 #define SC_CPU_RESET_REQ(x)		(0x520 + (x << 3))	/* reset */
44 #define SC_CPU_RESET_DREQ(x)		(0x524 + (x << 3))	/* unreset */
45 #define SC_CPU_RESET_STATUS(x)		(0x1520 + (x << 3))
46 
47 #define FAB_SF_MODE			0x0c
48 #define FAB_SF_INVLD			0x10
49 
50 /* bits definition in FB_SF_INVLD */
51 #define FB_SF_INVLD_START		(1 << 8)
52 
53 #define HIP04_MAX_CLUSTERS		4
54 #define HIP04_MAX_CPUS_PER_CLUSTER	4
55 
56 #define POLL_MSEC	10
57 #define TIMEOUT_MSEC	1000
58 
59 static void __iomem *sysctrl, *fabric;
60 static int hip04_cpu_table[HIP04_MAX_CLUSTERS][HIP04_MAX_CPUS_PER_CLUSTER];
61 static DEFINE_SPINLOCK(boot_lock);
62 static u32 fabric_phys_addr;
63 /*
64  * [0]: bootwrapper physical address
65  * [1]: bootwrapper size
66  * [2]: relocation address
67  * [3]: relocation size
68  */
69 static u32 hip04_boot_method[4];
70 
71 static bool hip04_cluster_is_down(unsigned int cluster)
72 {
73 	int i;
74 
75 	for (i = 0; i < HIP04_MAX_CPUS_PER_CLUSTER; i++)
76 		if (hip04_cpu_table[cluster][i])
77 			return false;
78 	return true;
79 }
80 
81 static void hip04_set_snoop_filter(unsigned int cluster, unsigned int on)
82 {
83 	unsigned long data;
84 
85 	if (!fabric)
86 		BUG();
87 	data = readl_relaxed(fabric + FAB_SF_MODE);
88 	if (on)
89 		data |= 1 << cluster;
90 	else
91 		data &= ~(1 << cluster);
92 	writel_relaxed(data, fabric + FAB_SF_MODE);
93 	do {
94 		cpu_relax();
95 	} while (data != readl_relaxed(fabric + FAB_SF_MODE));
96 }
97 
98 static int hip04_boot_secondary(unsigned int l_cpu, struct task_struct *idle)
99 {
100 	unsigned int mpidr, cpu, cluster;
101 	unsigned long data;
102 	void __iomem *sys_dreq, *sys_status;
103 
104 	mpidr = cpu_logical_map(l_cpu);
105 	cpu = MPIDR_AFFINITY_LEVEL(mpidr, 0);
106 	cluster = MPIDR_AFFINITY_LEVEL(mpidr, 1);
107 
108 	if (!sysctrl)
109 		return -ENODEV;
110 	if (cluster >= HIP04_MAX_CLUSTERS || cpu >= HIP04_MAX_CPUS_PER_CLUSTER)
111 		return -EINVAL;
112 
113 	spin_lock_irq(&boot_lock);
114 
115 	if (hip04_cpu_table[cluster][cpu])
116 		goto out;
117 
118 	sys_dreq = sysctrl + SC_CPU_RESET_DREQ(cluster);
119 	sys_status = sysctrl + SC_CPU_RESET_STATUS(cluster);
120 	if (hip04_cluster_is_down(cluster)) {
121 		data = CLUSTER_DEBUG_RESET_BIT;
122 		writel_relaxed(data, sys_dreq);
123 		do {
124 			cpu_relax();
125 			data = readl_relaxed(sys_status);
126 		} while (data & CLUSTER_DEBUG_RESET_STATUS);
127 		hip04_set_snoop_filter(cluster, 1);
128 	}
129 
130 	data = CORE_RESET_BIT(cpu) | NEON_RESET_BIT(cpu) | \
131 	       CORE_DEBUG_RESET_BIT(cpu);
132 	writel_relaxed(data, sys_dreq);
133 	do {
134 		cpu_relax();
135 	} while (data == readl_relaxed(sys_status));
136 
137 	/*
138 	 * We may fail to power up core again without this delay.
139 	 * It's not mentioned in document. It's found by test.
140 	 */
141 	udelay(20);
142 
143 	arch_send_wakeup_ipi_mask(cpumask_of(l_cpu));
144 
145 out:
146 	hip04_cpu_table[cluster][cpu]++;
147 	spin_unlock_irq(&boot_lock);
148 
149 	return 0;
150 }
151 
152 #ifdef CONFIG_HOTPLUG_CPU
153 static void hip04_cpu_die(unsigned int l_cpu)
154 {
155 	unsigned int mpidr, cpu, cluster;
156 	bool last_man;
157 
158 	mpidr = cpu_logical_map(l_cpu);
159 	cpu = MPIDR_AFFINITY_LEVEL(mpidr, 0);
160 	cluster = MPIDR_AFFINITY_LEVEL(mpidr, 1);
161 
162 	spin_lock(&boot_lock);
163 	hip04_cpu_table[cluster][cpu]--;
164 	if (hip04_cpu_table[cluster][cpu] == 1) {
165 		/* A power_up request went ahead of us. */
166 		spin_unlock(&boot_lock);
167 		return;
168 	} else if (hip04_cpu_table[cluster][cpu] > 1) {
169 		pr_err("Cluster %d CPU%d boots multiple times\n", cluster, cpu);
170 		BUG();
171 	}
172 
173 	last_man = hip04_cluster_is_down(cluster);
174 	spin_unlock(&boot_lock);
175 	if (last_man) {
176 		/* Since it's Cortex A15, disable L2 prefetching. */
177 		asm volatile(
178 		"mcr	p15, 1, %0, c15, c0, 3 \n\t"
179 		"isb	\n\t"
180 		"dsb	"
181 		: : "r" (0x400) );
182 		v7_exit_coherency_flush(all);
183 	} else {
184 		v7_exit_coherency_flush(louis);
185 	}
186 
187 	for (;;)
188 		wfi();
189 }
190 
191 static int hip04_cpu_kill(unsigned int l_cpu)
192 {
193 	unsigned int mpidr, cpu, cluster;
194 	unsigned int data, tries, count;
195 
196 	mpidr = cpu_logical_map(l_cpu);
197 	cpu = MPIDR_AFFINITY_LEVEL(mpidr, 0);
198 	cluster = MPIDR_AFFINITY_LEVEL(mpidr, 1);
199 	BUG_ON(cluster >= HIP04_MAX_CLUSTERS ||
200 	       cpu >= HIP04_MAX_CPUS_PER_CLUSTER);
201 
202 	count = TIMEOUT_MSEC / POLL_MSEC;
203 	spin_lock_irq(&boot_lock);
204 	for (tries = 0; tries < count; tries++) {
205 		if (hip04_cpu_table[cluster][cpu])
206 			goto err;
207 		cpu_relax();
208 		data = readl_relaxed(sysctrl + SC_CPU_RESET_STATUS(cluster));
209 		if (data & CORE_WFI_STATUS(cpu))
210 			break;
211 		spin_unlock_irq(&boot_lock);
212 		/* Wait for clean L2 when the whole cluster is down. */
213 		msleep(POLL_MSEC);
214 		spin_lock_irq(&boot_lock);
215 	}
216 	if (tries >= count)
217 		goto err;
218 	data = CORE_RESET_BIT(cpu) | NEON_RESET_BIT(cpu) | \
219 	       CORE_DEBUG_RESET_BIT(cpu);
220 	writel_relaxed(data, sysctrl + SC_CPU_RESET_REQ(cluster));
221 	for (tries = 0; tries < count; tries++) {
222 		cpu_relax();
223 		data = readl_relaxed(sysctrl + SC_CPU_RESET_STATUS(cluster));
224 		if (data & CORE_RESET_STATUS(cpu))
225 			break;
226 	}
227 	if (tries >= count)
228 		goto err;
229 	if (hip04_cluster_is_down(cluster))
230 		hip04_set_snoop_filter(cluster, 0);
231 	spin_unlock_irq(&boot_lock);
232 	return 1;
233 err:
234 	spin_unlock_irq(&boot_lock);
235 	return 0;
236 }
237 #endif
238 
239 static const struct smp_operations hip04_smp_ops __initconst = {
240 	.smp_boot_secondary	= hip04_boot_secondary,
241 #ifdef CONFIG_HOTPLUG_CPU
242 	.cpu_die		= hip04_cpu_die,
243 	.cpu_kill		= hip04_cpu_kill,
244 #endif
245 };
246 
247 static bool __init hip04_cpu_table_init(void)
248 {
249 	unsigned int mpidr, cpu, cluster;
250 
251 	mpidr = read_cpuid_mpidr();
252 	cpu = MPIDR_AFFINITY_LEVEL(mpidr, 0);
253 	cluster = MPIDR_AFFINITY_LEVEL(mpidr, 1);
254 
255 	if (cluster >= HIP04_MAX_CLUSTERS ||
256 	    cpu >= HIP04_MAX_CPUS_PER_CLUSTER) {
257 		pr_err("%s: boot CPU is out of bound!\n", __func__);
258 		return false;
259 	}
260 	hip04_set_snoop_filter(cluster, 1);
261 	hip04_cpu_table[cluster][cpu] = 1;
262 	return true;
263 }
264 
265 static int __init hip04_smp_init(void)
266 {
267 	struct device_node *np, *np_sctl, *np_fab;
268 	struct resource fab_res;
269 	void __iomem *relocation;
270 	int ret = -ENODEV;
271 
272 	np = of_find_compatible_node(NULL, NULL, "hisilicon,hip04-bootwrapper");
273 	if (!np)
274 		goto err;
275 	ret = of_property_read_u32_array(np, "boot-method",
276 					 &hip04_boot_method[0], 4);
277 	if (ret)
278 		goto err;
279 
280 	ret = -ENODEV;
281 	np_sctl = of_find_compatible_node(NULL, NULL, "hisilicon,sysctrl");
282 	if (!np_sctl)
283 		goto err;
284 	np_fab = of_find_compatible_node(NULL, NULL, "hisilicon,hip04-fabric");
285 	if (!np_fab)
286 		goto err;
287 
288 	ret = memblock_reserve(hip04_boot_method[0], hip04_boot_method[1]);
289 	if (ret)
290 		goto err;
291 
292 	relocation = ioremap(hip04_boot_method[2], hip04_boot_method[3]);
293 	if (!relocation) {
294 		pr_err("failed to map relocation space\n");
295 		ret = -ENOMEM;
296 		goto err_reloc;
297 	}
298 	sysctrl = of_iomap(np_sctl, 0);
299 	if (!sysctrl) {
300 		pr_err("failed to get sysctrl base\n");
301 		ret = -ENOMEM;
302 		goto err_sysctrl;
303 	}
304 	ret = of_address_to_resource(np_fab, 0, &fab_res);
305 	if (ret) {
306 		pr_err("failed to get fabric base phys\n");
307 		goto err_fabric;
308 	}
309 	fabric_phys_addr = fab_res.start;
310 	sync_cache_w(&fabric_phys_addr);
311 	fabric = of_iomap(np_fab, 0);
312 	if (!fabric) {
313 		pr_err("failed to get fabric base\n");
314 		ret = -ENOMEM;
315 		goto err_fabric;
316 	}
317 
318 	if (!hip04_cpu_table_init()) {
319 		ret = -EINVAL;
320 		goto err_table;
321 	}
322 
323 	/*
324 	 * Fill the instruction address that is used after secondary core
325 	 * out of reset.
326 	 */
327 	writel_relaxed(hip04_boot_method[0], relocation);
328 	writel_relaxed(0xa5a5a5a5, relocation + 4);	/* magic number */
329 	writel_relaxed(__pa_symbol(secondary_startup), relocation + 8);
330 	writel_relaxed(0, relocation + 12);
331 	iounmap(relocation);
332 
333 	smp_set_ops(&hip04_smp_ops);
334 	return ret;
335 err_table:
336 	iounmap(fabric);
337 err_fabric:
338 	iounmap(sysctrl);
339 err_sysctrl:
340 	iounmap(relocation);
341 err_reloc:
342 	memblock_free(hip04_boot_method[0], hip04_boot_method[1]);
343 err:
344 	return ret;
345 }
346 early_initcall(hip04_smp_init);
347