arch/arm/mach-zynq/common.c

   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 #include <linux/slab.h>
  33 #include <linux/sys_soc.h>
  34
  35 #include <asm/mach/arch.h>
  36 #include <asm/mach/map.h>
  37 #include <asm/mach/time.h>
  38 #include <asm/mach-types.h>
  39 #include <asm/page.h>
  40 #include <asm/pgtable.h>
  41 #include <asm/smp_scu.h>
  42 #include <asm/system_info.h>
  43 #include <asm/hardware/cache-l2x0.h>
  44
  45 #include "common.h"
  46
  47 #define ZYNQ_DEVCFG_MCTRL               0x80
  48 #define ZYNQ_DEVCFG_PS_VERSION_SHIFT    28
  49 #define ZYNQ_DEVCFG_PS_VERSION_MASK     0xF
  50
  51 void __iomem *zynq_scu_base;
  52
  53 /**
  54  * zynq_memory_init - Initialize special memory
  55  *
  56  * We need to stop things allocating the low memory as DMA can't work in
  57  * the 1st 512K of memory.
  58  */
  59 static void __init zynq_memory_init(void)
  60 {
  61         if (!__pa(PAGE_OFFSET))
  62                 memblock_reserve(__pa(PAGE_OFFSET), __pa(swapper_pg_dir));
  63 }
  64
  65 static struct platform_device zynq_cpuidle_device = {
  66         .name = "cpuidle-zynq",
  67 };
  68
  69 /**
  70  * zynq_get_revision - Get Zynq silicon revision
  71  *
  72  * Return: Silicon version or -1 otherwise
  73  */
  74 static int __init zynq_get_revision(void)
  75 {
  76         struct device_node *np;
  77         void __iomem *zynq_devcfg_base;
  78         u32 revision;
  79
  80         np = of_find_compatible_node(NULL, NULL, "xlnx,zynq-devcfg-1.0");
  81         if (!np) {
  82                 pr_err("%s: no devcfg node found\n", __func__);
  83                 return -1;
  84         }
  85
  86         zynq_devcfg_base = of_iomap(np, 0);
  87         if (!zynq_devcfg_base) {
  88                 pr_err("%s: Unable to map I/O memory\n", __func__);
  89                 return -1;
  90         }
  91
  92         revision = readl(zynq_devcfg_base + ZYNQ_DEVCFG_MCTRL);
  93         revision >>= ZYNQ_DEVCFG_PS_VERSION_SHIFT;
  94         revision &= ZYNQ_DEVCFG_PS_VERSION_MASK;
  95
  96         iounmap(zynq_devcfg_base);
  97
  98         return revision;
  99 }
 100
 101 /**
 102  * zynq_init_machine - System specific initialization, intended to be
 103  *                     called from board specific initialization.
 104  */
 105 static void __init zynq_init_machine(void)
 106 {
 107         struct platform_device_info devinfo = { .name = "cpufreq-cpu0", };
 108         struct soc_device_attribute *soc_dev_attr;
 109         struct soc_device *soc_dev;
 110         struct device *parent = NULL;
 111
 112         soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
 113         if (!soc_dev_attr)
 114                 goto out;
 115
 116         system_rev = zynq_get_revision();
 117
 118         soc_dev_attr->family = kasprintf(GFP_KERNEL, "Xilinx Zynq");
 119         soc_dev_attr->revision = kasprintf(GFP_KERNEL, "0x%x", system_rev);
 120         soc_dev_attr->soc_id = kasprintf(GFP_KERNEL, "0x%x",
 121                                          zynq_slcr_get_device_id());
 122
 123         soc_dev = soc_device_register(soc_dev_attr);
 124         if (IS_ERR(soc_dev)) {
 125                 kfree(soc_dev_attr->family);
 126                 kfree(soc_dev_attr->revision);
 127                 kfree(soc_dev_attr->soc_id);
 128                 kfree(soc_dev_attr);
 129                 goto out;
 130         }
 131
 132         parent = soc_device_to_device(soc_dev);
 133
 134 out:
 135         /*
 136          * Finished with the static registrations now; fill in the missing
 137          * devices
 138          */
 139         of_platform_populate(NULL, of_default_bus_match_table, NULL, parent);
 140
 141         platform_device_register(&zynq_cpuidle_device);
 142         platform_device_register_full(&devinfo);
 143
 144         zynq_slcr_init();
 145 }
 146
 147 static void __init zynq_timer_init(void)
 148 {
 149         zynq_early_slcr_init();
 150
 151         zynq_clock_init();
 152         of_clk_init(NULL);
 153         clocksource_of_init();
 154 }
 155
 156 static struct map_desc zynq_cortex_a9_scu_map __initdata = {
 157         .length = SZ_256,
 158         .type   = MT_DEVICE,
 159 };
 160
 161 static void __init zynq_scu_map_io(void)
 162 {
 163         unsigned long base;
 164
 165         base = scu_a9_get_base();
 166         zynq_cortex_a9_scu_map.pfn = __phys_to_pfn(base);
 167         /* Expected address is in vmalloc area that's why simple assign here */
 168         zynq_cortex_a9_scu_map.virtual = base;
 169         iotable_init(&zynq_cortex_a9_scu_map, 1);
 170         zynq_scu_base = (void __iomem *)base;
 171         BUG_ON(!zynq_scu_base);
 172 }
 173
 174 /**
 175  * zynq_map_io - Create memory mappings needed for early I/O.
 176  */
 177 static void __init zynq_map_io(void)
 178 {
 179         debug_ll_io_init();
 180         zynq_scu_map_io();
 181 }
 182
 183 static void __init zynq_irq_init(void)
 184 {
 185         gic_arch_extn.flags = IRQCHIP_SKIP_SET_WAKE | IRQCHIP_MASK_ON_SUSPEND;
 186         irqchip_init();
 187 }
 188
 189 static void zynq_system_reset(enum reboot_mode mode, const char *cmd)
 190 {
 191         zynq_slcr_system_reset();
 192 }
 193
 194 static const char * const zynq_dt_match[] = {
 195         "xlnx,zynq-7000",
 196         NULL
 197 };
 198
 199 DT_MACHINE_START(XILINX_EP107, "Xilinx Zynq Platform")
 200         /* 64KB way size, 8-way associativity, parity disabled */
 201         .l2c_aux_val    = 0x02000000,
 202         .l2c_aux_mask   = 0xf0ffffff,
 203         .smp            = smp_ops(zynq_smp_ops),
 204         .map_io         = zynq_map_io,
 205         .init_irq       = zynq_irq_init,
 206         .init_machine   = zynq_init_machine,
 207         .init_time      = zynq_timer_init,
 208         .dt_compat      = zynq_dt_match,
 209         .reserve        = zynq_memory_init,
 210         .restart        = zynq_system_reset,
 211 MACHINE_END