1 /*
2  * This file is subject to the terms and conditions of the GNU General Public
3  * License.  See the file "COPYING" in the main directory of this archive
4  * for more details.
5  *
6  * Numascale NumaConnect-Specific APIC Code
7  *
8  * Copyright (C) 2011 Numascale AS. All rights reserved.
9  *
10  * Send feedback to <support@numascale.com>
11  *
12  */
13 
14 #include <linux/errno.h>
15 #include <linux/threads.h>
16 #include <linux/cpumask.h>
17 #include <linux/string.h>
18 #include <linux/kernel.h>
19 #include <linux/module.h>
20 #include <linux/ctype.h>
21 #include <linux/init.h>
22 #include <linux/hardirq.h>
23 #include <linux/delay.h>
24 
25 #include <asm/numachip/numachip.h>
26 #include <asm/numachip/numachip_csr.h>
27 #include <asm/smp.h>
28 #include <asm/apic.h>
29 #include <asm/ipi.h>
30 #include <asm/apic_flat_64.h>
31 #include <asm/pgtable.h>
32 
33 static int numachip_system __read_mostly;
34 
35 static const struct apic apic_numachip;
36 
37 static unsigned int get_apic_id(unsigned long x)
38 {
39 	unsigned long value;
40 	unsigned int id;
41 
42 	rdmsrl(MSR_FAM10H_NODE_ID, value);
43 	id = ((x >> 24) & 0xffU) | ((value << 2) & 0xff00U);
44 
45 	return id;
46 }
47 
48 static unsigned long set_apic_id(unsigned int id)
49 {
50 	unsigned long x;
51 
52 	x = ((id & 0xffU) << 24);
53 	return x;
54 }
55 
56 static unsigned int read_xapic_id(void)
57 {
58 	return get_apic_id(apic_read(APIC_ID));
59 }
60 
61 static int numachip_apic_id_valid(int apicid)
62 {
63 	/* Trust what bootloader passes in MADT */
64 	return 1;
65 }
66 
67 static int numachip_apic_id_registered(void)
68 {
69 	return physid_isset(read_xapic_id(), phys_cpu_present_map);
70 }
71 
72 static int numachip_phys_pkg_id(int initial_apic_id, int index_msb)
73 {
74 	return initial_apic_id >> index_msb;
75 }
76 
77 static int numachip_wakeup_secondary(int phys_apicid, unsigned long start_rip)
78 {
79 	union numachip_csr_g3_ext_irq_gen int_gen;
80 
81 	int_gen.s._destination_apic_id = phys_apicid;
82 	int_gen.s._vector = 0;
83 	int_gen.s._msgtype = APIC_DM_INIT >> 8;
84 	int_gen.s._index = 0;
85 
86 	write_lcsr(CSR_G3_EXT_IRQ_GEN, int_gen.v);
87 
88 	int_gen.s._msgtype = APIC_DM_STARTUP >> 8;
89 	int_gen.s._vector = start_rip >> 12;
90 
91 	write_lcsr(CSR_G3_EXT_IRQ_GEN, int_gen.v);
92 
93 	atomic_set(&init_deasserted, 1);
94 	return 0;
95 }
96 
97 static void numachip_send_IPI_one(int cpu, int vector)
98 {
99 	union numachip_csr_g3_ext_irq_gen int_gen;
100 	int apicid = per_cpu(x86_cpu_to_apicid, cpu);
101 
102 	int_gen.s._destination_apic_id = apicid;
103 	int_gen.s._vector = vector;
104 	int_gen.s._msgtype = (vector == NMI_VECTOR ? APIC_DM_NMI : APIC_DM_FIXED) >> 8;
105 	int_gen.s._index = 0;
106 
107 	write_lcsr(CSR_G3_EXT_IRQ_GEN, int_gen.v);
108 }
109 
110 static void numachip_send_IPI_mask(const struct cpumask *mask, int vector)
111 {
112 	unsigned int cpu;
113 
114 	for_each_cpu(cpu, mask)
115 		numachip_send_IPI_one(cpu, vector);
116 }
117 
118 static void numachip_send_IPI_mask_allbutself(const struct cpumask *mask,
119 						int vector)
120 {
121 	unsigned int this_cpu = smp_processor_id();
122 	unsigned int cpu;
123 
124 	for_each_cpu(cpu, mask) {
125 		if (cpu != this_cpu)
126 			numachip_send_IPI_one(cpu, vector);
127 	}
128 }
129 
130 static void numachip_send_IPI_allbutself(int vector)
131 {
132 	unsigned int this_cpu = smp_processor_id();
133 	unsigned int cpu;
134 
135 	for_each_online_cpu(cpu) {
136 		if (cpu != this_cpu)
137 			numachip_send_IPI_one(cpu, vector);
138 	}
139 }
140 
141 static void numachip_send_IPI_all(int vector)
142 {
143 	numachip_send_IPI_mask(cpu_online_mask, vector);
144 }
145 
146 static void numachip_send_IPI_self(int vector)
147 {
148 	apic_write(APIC_SELF_IPI, vector);
149 }
150 
151 static int __init numachip_probe(void)
152 {
153 	return apic == &apic_numachip;
154 }
155 
156 static void fixup_cpu_id(struct cpuinfo_x86 *c, int node)
157 {
158 	if (c->phys_proc_id != node) {
159 		c->phys_proc_id = node;
160 		per_cpu(cpu_llc_id, smp_processor_id()) = node;
161 	}
162 }
163 
164 static int __init numachip_system_init(void)
165 {
166 	if (!numachip_system)
167 		return 0;
168 
169 	init_extra_mapping_uc(NUMACHIP_LCSR_BASE, NUMACHIP_LCSR_SIZE);
170 	init_extra_mapping_uc(NUMACHIP_GCSR_BASE, NUMACHIP_GCSR_SIZE);
171 
172 	x86_cpuinit.fixup_cpu_id = fixup_cpu_id;
173 	x86_init.pci.arch_init = pci_numachip_init;
174 
175 	return 0;
176 }
177 early_initcall(numachip_system_init);
178 
179 static int numachip_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
180 {
181 	if (!strncmp(oem_id, "NUMASC", 6)) {
182 		numachip_system = 1;
183 		return 1;
184 	}
185 
186 	return 0;
187 }
188 
189 static const struct apic apic_numachip __refconst = {
190 
191 	.name				= "NumaConnect system",
192 	.probe				= numachip_probe,
193 	.acpi_madt_oem_check		= numachip_acpi_madt_oem_check,
194 	.apic_id_valid			= numachip_apic_id_valid,
195 	.apic_id_registered		= numachip_apic_id_registered,
196 
197 	.irq_delivery_mode		= dest_Fixed,
198 	.irq_dest_mode			= 0, /* physical */
199 
200 	.target_cpus			= online_target_cpus,
201 	.disable_esr			= 0,
202 	.dest_logical			= 0,
203 	.check_apicid_used		= NULL,
204 
205 	.vector_allocation_domain	= default_vector_allocation_domain,
206 	.init_apic_ldr			= flat_init_apic_ldr,
207 
208 	.ioapic_phys_id_map		= NULL,
209 	.setup_apic_routing		= NULL,
210 	.cpu_present_to_apicid		= default_cpu_present_to_apicid,
211 	.apicid_to_cpu_present		= NULL,
212 	.check_phys_apicid_present	= default_check_phys_apicid_present,
213 	.phys_pkg_id			= numachip_phys_pkg_id,
214 
215 	.get_apic_id			= get_apic_id,
216 	.set_apic_id			= set_apic_id,
217 	.apic_id_mask			= 0xffU << 24,
218 
219 	.cpu_mask_to_apicid_and		= default_cpu_mask_to_apicid_and,
220 
221 	.send_IPI_mask			= numachip_send_IPI_mask,
222 	.send_IPI_mask_allbutself	= numachip_send_IPI_mask_allbutself,
223 	.send_IPI_allbutself		= numachip_send_IPI_allbutself,
224 	.send_IPI_all			= numachip_send_IPI_all,
225 	.send_IPI_self			= numachip_send_IPI_self,
226 
227 	.wakeup_secondary_cpu		= numachip_wakeup_secondary,
228 	.wait_for_init_deassert		= false,
229 	.inquire_remote_apic		= NULL, /* REMRD not supported */
230 
231 	.read				= native_apic_mem_read,
232 	.write				= native_apic_mem_write,
233 	.eoi_write			= native_apic_mem_write,
234 	.icr_read			= native_apic_icr_read,
235 	.icr_write			= native_apic_icr_write,
236 	.wait_icr_idle			= native_apic_wait_icr_idle,
237 	.safe_wait_icr_idle		= native_safe_apic_wait_icr_idle,
238 };
239 apic_driver(apic_numachip);
240 
241