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/clocksource.h>
  19 #include <linux/dma-mapping.h>
  20 #include <linux/io.h>
  21 #include <linux/irqchip.h>
  22 #include <linux/of.h>
  23 #include <linux/of_irq.h>
  24 #include <linux/of_platform.h>
  25 #include <linux/of_address.h>
  26 #include <linux/amba/bus.h>
  27 #include <linux/clk-provider.h>
  28
  29 #include <asm/cacheflush.h>
  30 #include <asm/cputype.h>
  31 #include <asm/smp_plat.h>
  32 #include <asm/hardware/cache-l2x0.h>
  33 #include <asm/mach/arch.h>
  34 #include <asm/mach/map.h>
  35
  36 #include "core.h"
  37 #include "sysregs.h"
  38
  39 void __iomem *sregs_base;
  40 void __iomem *scu_base_addr;
  41
  42 static void __init highbank_scu_map_io(void)
  43 {
  44         unsigned long base;
  45
  46         /* Get SCU base */
  47         asm("mrc p15, 4, %0, c15, c0, 0" : "=r" (base));
  48
  49         scu_base_addr = ioremap(base, SZ_4K);
  50 }
  51
  52 #define HB_JUMP_TABLE_PHYS(cpu)         (0x40 + (0x10 * (cpu)))
  53 #define HB_JUMP_TABLE_VIRT(cpu)         phys_to_virt(HB_JUMP_TABLE_PHYS(cpu))
  54
  55 void highbank_set_cpu_jump(int cpu, void *jump_addr)
  56 {
  57         cpu = MPIDR_AFFINITY_LEVEL(cpu_logical_map(cpu), 0);
  58         writel(virt_to_phys(jump_addr), HB_JUMP_TABLE_VIRT(cpu));
  59         __cpuc_flush_dcache_area(HB_JUMP_TABLE_VIRT(cpu), 16);
  60         outer_clean_range(HB_JUMP_TABLE_PHYS(cpu),
  61                           HB_JUMP_TABLE_PHYS(cpu) + 15);
  62 }
  63
  64 static void highbank_l2x0_disable(void)
  65 {
  66         /* Disable PL310 L2 Cache controller */
  67         highbank_smc1(0x102, 0x0);
  68 }
  69
  70 static void __init highbank_init_irq(void)
  71 {
  72         irqchip_init();
  73
  74         if (of_find_compatible_node(NULL, NULL, "arm,cortex-a9"))
  75                 highbank_scu_map_io();
  76
  77         /* Enable PL310 L2 Cache controller */
  78         if (IS_ENABLED(CONFIG_CACHE_L2X0) &&
  79             of_find_compatible_node(NULL, NULL, "arm,pl310-cache")) {
  80                 highbank_smc1(0x102, 0x1);
  81                 l2x0_of_init(0, ~0UL);
  82                 outer_cache.disable = highbank_l2x0_disable;
  83         }
  84 }
  85
  86 static void __init highbank_timer_init(void)
  87 {
  88         struct device_node *np;
  89
  90         /* Map system registers */
  91         np = of_find_compatible_node(NULL, NULL, "calxeda,hb-sregs");
  92         sregs_base = of_iomap(np, 0);
  93         WARN_ON(!sregs_base);
  94
  95         of_clk_init(NULL);
  96
  97         clocksource_of_init();
  98 }
  99
 100 static void highbank_power_off(void)
 101 {
 102         highbank_set_pwr_shutdown();
 103
 104         while (1)
 105                 cpu_do_idle();
 106 }
 107
 108 static int highbank_platform_notifier(struct notifier_block *nb,
 109                                   unsigned long event, void *__dev)
 110 {
 111         struct resource *res;
 112         int reg = -1;
 113         u32 val;
 114         struct device *dev = __dev;
 115
 116         if (event != BUS_NOTIFY_ADD_DEVICE)
 117                 return NOTIFY_DONE;
 118
 119         if (of_device_is_compatible(dev->of_node, "calxeda,hb-ahci"))
 120                 reg = 0xc;
 121         else if (of_device_is_compatible(dev->of_node, "calxeda,hb-sdhci"))
 122                 reg = 0x18;
 123         else if (of_device_is_compatible(dev->of_node, "arm,pl330"))
 124                 reg = 0x20;
 125         else if (of_device_is_compatible(dev->of_node, "calxeda,hb-xgmac")) {
 126                 res = platform_get_resource(to_platform_device(dev),
 127                                             IORESOURCE_MEM, 0);
 128                 if (res) {
 129                         if (res->start == 0xfff50000)
 130                                 reg = 0;
 131                         else if (res->start == 0xfff51000)
 132                                 reg = 4;
 133                 }
 134         }
 135
 136         if (reg < 0)
 137                 return NOTIFY_DONE;
 138
 139         if (of_property_read_bool(dev->of_node, "dma-coherent")) {
 140                 val = readl(sregs_base + reg);
 141                 writel(val | 0xff01, sregs_base + reg);
 142                 set_dma_ops(dev, &arm_coherent_dma_ops);
 143         }
 144
 145         return NOTIFY_OK;
 146 }
 147
 148 static struct notifier_block highbank_amba_nb = {
 149         .notifier_call = highbank_platform_notifier,
 150 };
 151
 152 static struct notifier_block highbank_platform_nb = {
 153         .notifier_call = highbank_platform_notifier,
 154 };
 155
 156 static void __init highbank_init(void)
 157 {
 158         pm_power_off = highbank_power_off;
 159         highbank_pm_init();
 160
 161         bus_register_notifier(&platform_bus_type, &highbank_platform_nb);
 162         bus_register_notifier(&amba_bustype, &highbank_amba_nb);
 163
 164         of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
 165 }
 166
 167 static const char *highbank_match[] __initconst = {
 168         "calxeda,highbank",
 169         "calxeda,ecx-2000",
 170         NULL,
 171 };
 172
 173 DT_MACHINE_START(HIGHBANK, "Highbank")
 174 #if defined(CONFIG_ZONE_DMA) && defined(CONFIG_ARM_LPAE)
 175         .dma_zone_size  = (4ULL * SZ_1G),
 176 #endif
 177         .smp            = smp_ops(highbank_smp_ops),
 178         .init_irq       = highbank_init_irq,
 179         .init_time      = highbank_timer_init,
 180         .init_machine   = highbank_init,
 181         .dt_compat      = highbank_match,
 182         .restart        = highbank_restart,
 183 MACHINE_END