Merge tag 'soc' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
[~shefty/rdma-dev.git] / arch / arm / mach-highbank / highbank.c
1 /*
2  * Copyright 2010-2011 Calxeda, Inc.
3  *
4  * This program is free software; you can redistribute it and/or modify it
5  * under the terms and conditions of the GNU General Public License,
6  * version 2, as published by the Free Software Foundation.
7  *
8  * This program is distributed in the hope it will be useful, but WITHOUT
9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
11  * more details.
12  *
13  * You should have received a copy of the GNU General Public License along with
14  * this program.  If not, see <http://www.gnu.org/licenses/>.
15  */
16 #include <linux/clk.h>
17 #include <linux/clkdev.h>
18 #include <linux/io.h>
19 #include <linux/irq.h>
20 #include <linux/irqdomain.h>
21 #include <linux/of.h>
22 #include <linux/of_irq.h>
23 #include <linux/of_platform.h>
24 #include <linux/of_address.h>
25 #include <linux/smp.h>
26
27 #include <asm/cacheflush.h>
28 #include <asm/smp_plat.h>
29 #include <asm/smp_scu.h>
30 #include <asm/smp_twd.h>
31 #include <asm/hardware/arm_timer.h>
32 #include <asm/hardware/timer-sp.h>
33 #include <asm/hardware/gic.h>
34 #include <asm/hardware/cache-l2x0.h>
35 #include <asm/mach/arch.h>
36 #include <asm/mach/map.h>
37 #include <asm/mach/time.h>
38 #include <mach/irqs.h>
39
40 #include "core.h"
41 #include "sysregs.h"
42
43 void __iomem *sregs_base;
44
45 #define HB_SCU_VIRT_BASE        0xfee00000
46 void __iomem *scu_base_addr = ((void __iomem *)(HB_SCU_VIRT_BASE));
47
48 static struct map_desc scu_io_desc __initdata = {
49         .virtual        = HB_SCU_VIRT_BASE,
50         .pfn            = 0, /* run-time */
51         .length         = SZ_4K,
52         .type           = MT_DEVICE,
53 };
54
55 static void __init highbank_scu_map_io(void)
56 {
57         unsigned long base;
58
59         /* Get SCU base */
60         asm("mrc p15, 4, %0, c15, c0, 0" : "=r" (base));
61
62         scu_io_desc.pfn = __phys_to_pfn(base);
63         iotable_init(&scu_io_desc, 1);
64 }
65
66 static void __init highbank_map_io(void)
67 {
68         highbank_scu_map_io();
69         highbank_lluart_map_io();
70 }
71
72 #define HB_JUMP_TABLE_PHYS(cpu)         (0x40 + (0x10 * (cpu)))
73 #define HB_JUMP_TABLE_VIRT(cpu)         phys_to_virt(HB_JUMP_TABLE_PHYS(cpu))
74
75 void highbank_set_cpu_jump(int cpu, void *jump_addr)
76 {
77         cpu = cpu_logical_map(cpu);
78         writel(virt_to_phys(jump_addr), HB_JUMP_TABLE_VIRT(cpu));
79         __cpuc_flush_dcache_area(HB_JUMP_TABLE_VIRT(cpu), 16);
80         outer_clean_range(HB_JUMP_TABLE_PHYS(cpu),
81                           HB_JUMP_TABLE_PHYS(cpu) + 15);
82 }
83
84 const static struct of_device_id irq_match[] = {
85         { .compatible = "arm,cortex-a9-gic", .data = gic_of_init, },
86         {}
87 };
88
89 static void __init highbank_init_irq(void)
90 {
91         of_irq_init(irq_match);
92         l2x0_of_init(0, ~0UL);
93 }
94
95 static void __init highbank_timer_init(void)
96 {
97         int irq;
98         struct device_node *np;
99         void __iomem *timer_base;
100
101         /* Map system registers */
102         np = of_find_compatible_node(NULL, NULL, "calxeda,hb-sregs");
103         sregs_base = of_iomap(np, 0);
104         WARN_ON(!sregs_base);
105
106         np = of_find_compatible_node(NULL, NULL, "arm,sp804");
107         timer_base = of_iomap(np, 0);
108         WARN_ON(!timer_base);
109         irq = irq_of_parse_and_map(np, 0);
110
111         highbank_clocks_init();
112
113         sp804_clocksource_and_sched_clock_init(timer_base + 0x20, "timer1");
114         sp804_clockevents_init(timer_base, irq, "timer0");
115
116         twd_local_timer_of_register();
117 }
118
119 static struct sys_timer highbank_timer = {
120         .init = highbank_timer_init,
121 };
122
123 static void highbank_power_off(void)
124 {
125         hignbank_set_pwr_shutdown();
126         scu_power_mode(scu_base_addr, SCU_PM_POWEROFF);
127
128         while (1)
129                 cpu_do_idle();
130 }
131
132 static void __init highbank_init(void)
133 {
134         pm_power_off = highbank_power_off;
135
136         of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
137 }
138
139 static const char *highbank_match[] __initconst = {
140         "calxeda,highbank",
141         NULL,
142 };
143
144 DT_MACHINE_START(HIGHBANK, "Highbank")
145         .map_io         = highbank_map_io,
146         .init_irq       = highbank_init_irq,
147         .timer          = &highbank_timer,
148         .handle_irq     = gic_handle_irq,
149         .init_machine   = highbank_init,
150         .dt_compat      = highbank_match,
151         .restart        = highbank_restart,
152 MACHINE_END