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TOMOYO Linux Cross Reference
Linux/arch/arm/mach-zynq/common.c

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  1 /*
  2  * This file contains common code that is intended to be used across
  3  * boards so that it's not replicated.
  4  *
  5  *  Copyright (C) 2011 Xilinx
  6  *
  7  * This software is licensed under the terms of the GNU General Public
  8  * License version 2, as published by the Free Software Foundation, and
  9  * may be copied, distributed, and modified under those terms.
 10  *
 11  * This program is distributed in the hope that it will be useful,
 12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 14  * GNU General Public License for more details.
 15  */
 16 
 17 #include <linux/init.h>
 18 #include <linux/kernel.h>
 19 #include <linux/cpumask.h>
 20 #include <linux/platform_device.h>
 21 #include <linux/clk.h>
 22 #include <linux/clk-provider.h>
 23 #include <linux/clk/zynq.h>
 24 #include <linux/clocksource.h>
 25 #include <linux/of_address.h>
 26 #include <linux/of_irq.h>
 27 #include <linux/of_platform.h>
 28 #include <linux/of.h>
 29 #include <linux/memblock.h>
 30 #include <linux/irqchip.h>
 31 #include <linux/irqchip/arm-gic.h>
 32 
 33 #include <asm/mach/arch.h>
 34 #include <asm/mach/map.h>
 35 #include <asm/mach/time.h>
 36 #include <asm/mach-types.h>
 37 #include <asm/page.h>
 38 #include <asm/pgtable.h>
 39 #include <asm/smp_scu.h>
 40 #include <asm/hardware/cache-l2x0.h>
 41 
 42 #include "common.h"
 43 
 44 void __iomem *zynq_scu_base;
 45 
 46 /**
 47  * zynq_memory_init - Initialize special memory
 48  *
 49  * We need to stop things allocating the low memory as DMA can't work in
 50  * the 1st 512K of memory.
 51  */
 52 static void __init zynq_memory_init(void)
 53 {
 54         if (!__pa(PAGE_OFFSET))
 55                 memblock_reserve(__pa(PAGE_OFFSET), __pa(swapper_pg_dir));
 56 }
 57 
 58 static struct platform_device zynq_cpuidle_device = {
 59         .name = "cpuidle-zynq",
 60 };
 61 
 62 /**
 63  * zynq_init_machine - System specific initialization, intended to be
 64  *                     called from board specific initialization.
 65  */
 66 static void __init zynq_init_machine(void)
 67 {
 68         struct platform_device_info devinfo = { .name = "cpufreq-cpu0", };
 69 
 70         /*
 71          * 64KB way size, 8-way associativity, parity disabled
 72          */
 73         l2x0_of_init(0x02060000, 0xF0F0FFFF);
 74 
 75         of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
 76 
 77         platform_device_register(&zynq_cpuidle_device);
 78         platform_device_register_full(&devinfo);
 79 
 80         zynq_slcr_init();
 81 }
 82 
 83 static void __init zynq_timer_init(void)
 84 {
 85         zynq_early_slcr_init();
 86 
 87         zynq_clock_init();
 88         of_clk_init(NULL);
 89         clocksource_of_init();
 90 }
 91 
 92 static struct map_desc zynq_cortex_a9_scu_map __initdata = {
 93         .length = SZ_256,
 94         .type   = MT_DEVICE,
 95 };
 96 
 97 static void __init zynq_scu_map_io(void)
 98 {
 99         unsigned long base;
100 
101         base = scu_a9_get_base();
102         zynq_cortex_a9_scu_map.pfn = __phys_to_pfn(base);
103         /* Expected address is in vmalloc area that's why simple assign here */
104         zynq_cortex_a9_scu_map.virtual = base;
105         iotable_init(&zynq_cortex_a9_scu_map, 1);
106         zynq_scu_base = (void __iomem *)base;
107         BUG_ON(!zynq_scu_base);
108 }
109 
110 /**
111  * zynq_map_io - Create memory mappings needed for early I/O.
112  */
113 static void __init zynq_map_io(void)
114 {
115         debug_ll_io_init();
116         zynq_scu_map_io();
117 }
118 
119 static void __init zynq_irq_init(void)
120 {
121         gic_arch_extn.flags = IRQCHIP_SKIP_SET_WAKE | IRQCHIP_MASK_ON_SUSPEND;
122         irqchip_init();
123 }
124 
125 static void zynq_system_reset(enum reboot_mode mode, const char *cmd)
126 {
127         zynq_slcr_system_reset();
128 }
129 
130 static const char * const zynq_dt_match[] = {
131         "xlnx,zynq-7000",
132         NULL
133 };
134 
135 DT_MACHINE_START(XILINX_EP107, "Xilinx Zynq Platform")
136         .smp            = smp_ops(zynq_smp_ops),
137         .map_io         = zynq_map_io,
138         .init_irq       = zynq_irq_init,
139         .init_machine   = zynq_init_machine,
140         .init_time      = zynq_timer_init,
141         .dt_compat      = zynq_dt_match,
142         .reserve        = zynq_memory_init,
143         .restart        = zynq_system_reset,
144 MACHINE_END
145 

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