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1/*
2 * Copyright 2011 Freescale Semiconductor, Inc.
3 * Copyright 2011 Linaro Ltd.
4 *
5 * The code contained herein is licensed under the GNU General Public
6 * License. You may obtain a copy of the GNU General Public License
7 * Version 2 or later at the following locations:
8 *
9 * http://www.opensource.org/licenses/gpl-license.html
10 * http://www.gnu.org/copyleft/gpl.html
11 */
12
13#include <linux/init.h>
14#include <linux/of_address.h>
15#include <linux/of.h>
16#include <linux/smp.h>
17
18#include <asm/cacheflush.h>
19#include <asm/page.h>
20#include <asm/smp_scu.h>
21#include <asm/mach/map.h>
22
23#include "common.h"
24#include "hardware.h"
25
26u32 g_diag_reg;
27static void __iomem *scu_base;
28
29static struct map_desc scu_io_desc __initdata = {
30 /* .virtual and .pfn are run-time assigned */
31 .length = SZ_4K,
32 .type = MT_DEVICE,
33};
34
35void __init imx_scu_map_io(void)
36{
37 unsigned long base;
38
39 /* Get SCU base */
40 asm("mrc p15, 4, %0, c15, c0, 0" : "=r" (base));
41
42 scu_io_desc.virtual = IMX_IO_P2V(base);
43 scu_io_desc.pfn = __phys_to_pfn(base);
44 iotable_init(&scu_io_desc, 1);
45
46 scu_base = IMX_IO_ADDRESS(base);
47}
48
49static int imx_boot_secondary(unsigned int cpu, struct task_struct *idle)
50{
51 imx_set_cpu_jump(cpu, v7_secondary_startup);
52 imx_enable_cpu(cpu, true);
53 return 0;
54}
55
56/*
57 * Initialise the CPU possible map early - this describes the CPUs
58 * which may be present or become present in the system.
59 */
60static void __init imx_smp_init_cpus(void)
61{
62 int i, ncores;
63
64 ncores = scu_get_core_count(scu_base);
65
66 for (i = ncores; i < NR_CPUS; i++)
67 set_cpu_possible(i, false);
68}
69
70void imx_smp_prepare(void)
71{
72 scu_enable(scu_base);
73}
74
75static void __init imx_smp_prepare_cpus(unsigned int max_cpus)
76{
77 imx_smp_prepare();
78
79 /*
80 * The diagnostic register holds the errata bits. Mostly bootloader
81 * does not bring up secondary cores, so that when errata bits are set
82 * in bootloader, they are set only for boot cpu. But on a SMP
83 * configuration, it should be equally done on every single core.
84 * Read the register from boot cpu here, and will replicate it into
85 * secondary cores when booting them.
86 */
87 asm("mrc p15, 0, %0, c15, c0, 1" : "=r" (g_diag_reg) : : "cc");
88 sync_cache_w(&g_diag_reg);
89}
90
91const struct smp_operations imx_smp_ops __initconst = {
92 .smp_init_cpus = imx_smp_init_cpus,
93 .smp_prepare_cpus = imx_smp_prepare_cpus,
94 .smp_boot_secondary = imx_boot_secondary,
95#ifdef CONFIG_HOTPLUG_CPU
96 .cpu_die = imx_cpu_die,
97 .cpu_kill = imx_cpu_kill,
98#endif
99};
100
101#define DCFG_CCSR_SCRATCHRW1 0x200
102
103static int ls1021a_boot_secondary(unsigned int cpu, struct task_struct *idle)
104{
105 arch_send_wakeup_ipi_mask(cpumask_of(cpu));
106
107 return 0;
108}
109
110static void __init ls1021a_smp_prepare_cpus(unsigned int max_cpus)
111{
112 struct device_node *np;
113 void __iomem *dcfg_base;
114 unsigned long paddr;
115
116 np = of_find_compatible_node(NULL, NULL, "fsl,ls1021a-dcfg");
117 dcfg_base = of_iomap(np, 0);
118 BUG_ON(!dcfg_base);
119
120 paddr = virt_to_phys(secondary_startup);
121 writel_relaxed(cpu_to_be32(paddr), dcfg_base + DCFG_CCSR_SCRATCHRW1);
122
123 iounmap(dcfg_base);
124}
125
126const struct smp_operations ls1021a_smp_ops __initconst = {
127 .smp_prepare_cpus = ls1021a_smp_prepare_cpus,
128 .smp_boot_secondary = ls1021a_boot_secondary,
129};
1/*
2 * Copyright 2011 Freescale Semiconductor, Inc.
3 * Copyright 2011 Linaro Ltd.
4 *
5 * The code contained herein is licensed under the GNU General Public
6 * License. You may obtain a copy of the GNU General Public License
7 * Version 2 or later at the following locations:
8 *
9 * http://www.opensource.org/licenses/gpl-license.html
10 * http://www.gnu.org/copyleft/gpl.html
11 */
12
13#include <linux/init.h>
14#include <linux/smp.h>
15#include <asm/cacheflush.h>
16#include <asm/page.h>
17#include <asm/smp_scu.h>
18#include <asm/mach/map.h>
19
20#include "common.h"
21#include "hardware.h"
22
23#define SCU_STANDBY_ENABLE (1 << 5)
24
25u32 g_diag_reg;
26static void __iomem *scu_base;
27
28static struct map_desc scu_io_desc __initdata = {
29 /* .virtual and .pfn are run-time assigned */
30 .length = SZ_4K,
31 .type = MT_DEVICE,
32};
33
34void __init imx_scu_map_io(void)
35{
36 unsigned long base;
37
38 /* Get SCU base */
39 asm("mrc p15, 4, %0, c15, c0, 0" : "=r" (base));
40
41 scu_io_desc.virtual = IMX_IO_P2V(base);
42 scu_io_desc.pfn = __phys_to_pfn(base);
43 iotable_init(&scu_io_desc, 1);
44
45 scu_base = IMX_IO_ADDRESS(base);
46}
47
48void imx_scu_standby_enable(void)
49{
50 u32 val = readl_relaxed(scu_base);
51
52 val |= SCU_STANDBY_ENABLE;
53 writel_relaxed(val, scu_base);
54}
55
56static int imx_boot_secondary(unsigned int cpu, struct task_struct *idle)
57{
58 imx_set_cpu_jump(cpu, v7_secondary_startup);
59 imx_enable_cpu(cpu, true);
60 return 0;
61}
62
63/*
64 * Initialise the CPU possible map early - this describes the CPUs
65 * which may be present or become present in the system.
66 */
67static void __init imx_smp_init_cpus(void)
68{
69 int i, ncores;
70
71 ncores = scu_get_core_count(scu_base);
72
73 for (i = ncores; i < NR_CPUS; i++)
74 set_cpu_possible(i, false);
75}
76
77void imx_smp_prepare(void)
78{
79 scu_enable(scu_base);
80}
81
82static void __init imx_smp_prepare_cpus(unsigned int max_cpus)
83{
84 imx_smp_prepare();
85
86 /*
87 * The diagnostic register holds the errata bits. Mostly bootloader
88 * does not bring up secondary cores, so that when errata bits are set
89 * in bootloader, they are set only for boot cpu. But on a SMP
90 * configuration, it should be equally done on every single core.
91 * Read the register from boot cpu here, and will replicate it into
92 * secondary cores when booting them.
93 */
94 asm("mrc p15, 0, %0, c15, c0, 1" : "=r" (g_diag_reg) : : "cc");
95 sync_cache_w(&g_diag_reg);
96}
97
98struct smp_operations imx_smp_ops __initdata = {
99 .smp_init_cpus = imx_smp_init_cpus,
100 .smp_prepare_cpus = imx_smp_prepare_cpus,
101 .smp_boot_secondary = imx_boot_secondary,
102#ifdef CONFIG_HOTPLUG_CPU
103 .cpu_die = imx_cpu_die,
104 .cpu_kill = imx_cpu_kill,
105#endif
106};