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/dma-mapping.h>
  19 #include <linux/io.h>
  20 #include <linux/irq.h>
  21 #include <linux/irqchip.h>
  22 #include <linux/irqdomain.h>
  23 #include <linux/of.h>
  24 #include <linux/of_irq.h>
  25 #include <linux/of_platform.h>
  26 #include <linux/of_address.h>
  27 #include <linux/smp.h>
  28 #include <linux/amba/bus.h>
  29
  30 #include <asm/arch_timer.h>
  31 #include <asm/cacheflush.h>
  32 #include <asm/smp_plat.h>
  33 #include <asm/smp_twd.h>
  34 #include <asm/hardware/arm_timer.h>
  35 #include <asm/hardware/timer-sp.h>
  36 #include <asm/hardware/cache-l2x0.h>
  37 #include <asm/mach/arch.h>
  38 #include <asm/mach/map.h>
  39 #include <asm/mach/time.h>
  40
  41 #include "core.h"
  42 #include "sysregs.h"
  43
  44 void __iomem *sregs_base;
  45 void __iomem *scu_base_addr;
  46
  47 static void __init highbank_scu_map_io(void)
  48 {
  49         unsigned long base;
  50
  51         /* Get SCU base */
  52         asm("mrc p15, 4, %0, c15, c0, 0" : "=r" (base));
  53
  54         scu_base_addr = ioremap(base, SZ_4K);
  55 }
  56
  57 #define HB_JUMP_TABLE_PHYS(cpu)         (0x40 + (0x10 * (cpu)))
  58 #define HB_JUMP_TABLE_VIRT(cpu)         phys_to_virt(HB_JUMP_TABLE_PHYS(cpu))
  59
  60 void highbank_set_cpu_jump(int cpu, void *jump_addr)
  61 {
  62         cpu = cpu_logical_map(cpu);
  63         writel(virt_to_phys(jump_addr), HB_JUMP_TABLE_VIRT(cpu));
  64         __cpuc_flush_dcache_area(HB_JUMP_TABLE_VIRT(cpu), 16);
  65         outer_clean_range(HB_JUMP_TABLE_PHYS(cpu),
  66                           HB_JUMP_TABLE_PHYS(cpu) + 15);
  67 }
  68
  69 #ifdef CONFIG_CACHE_L2X0
  70 static void highbank_l2x0_disable(void)
  71 {
  72         /* Disable PL310 L2 Cache controller */
  73         highbank_smc1(0x102, 0x0);
  74 }
  75 #endif
  76
  77 static void __init highbank_init_irq(void)
  78 {
  79         irqchip_init();
  80
  81         if (of_find_compatible_node(NULL, NULL, "arm,cortex-a9"))
  82                 highbank_scu_map_io();
  83
  84 #ifdef CONFIG_CACHE_L2X0
  85         /* Enable PL310 L2 Cache controller */
  86         highbank_smc1(0x102, 0x1);
  87         l2x0_of_init(0, ~0UL);
  88         outer_cache.disable = highbank_l2x0_disable;
  89 #endif
  90 }
  91
  92 static struct clk_lookup lookup = {
  93         .dev_id = "sp804",
  94         .con_id = NULL,
  95 };
  96
  97 static void __init highbank_timer_init(void)
  98 {
  99         int irq;
 100         struct device_node *np;
 101         void __iomem *timer_base;
 102
 103         /* Map system registers */
 104         np = of_find_compatible_node(NULL, NULL, "calxeda,hb-sregs");
 105         sregs_base = of_iomap(np, 0);
 106         WARN_ON(!sregs_base);
 107
 108         np = of_find_compatible_node(NULL, NULL, "arm,sp804");
 109         timer_base = of_iomap(np, 0);
 110         WARN_ON(!timer_base);
 111         irq = irq_of_parse_and_map(np, 0);
 112
 113         highbank_clocks_init();
 114         lookup.clk = of_clk_get(np, 0);
 115         clkdev_add(&lookup);
 116
 117         sp804_clocksource_and_sched_clock_init(timer_base + 0x20, "timer1");
 118         sp804_clockevents_init(timer_base, irq, "timer0");
 119
 120         twd_local_timer_of_register();
 121
 122         arch_timer_of_register();
 123         arch_timer_sched_clock_init();
 124 }
 125
 126 static struct sys_timer highbank_timer = {
 127         .init = highbank_timer_init,
 128 };
 129
 130 static void highbank_power_off(void)
 131 {
 132         highbank_set_pwr_shutdown();
 133
 134         while (1)
 135                 cpu_do_idle();
 136 }
 137
 138 static int highbank_platform_notifier(struct notifier_block *nb,
 139                                   unsigned long event, void *__dev)
 140 {
 141         struct resource *res;
 142         int reg = -1;
 143         struct device *dev = __dev;
 144
 145         if (event != BUS_NOTIFY_ADD_DEVICE)
 146                 return NOTIFY_DONE;
 147
 148         if (of_device_is_compatible(dev->of_node, "calxeda,hb-ahci"))
 149                 reg = 0xc;
 150         else if (of_device_is_compatible(dev->of_node, "calxeda,hb-sdhci"))
 151                 reg = 0x18;
 152         else if (of_device_is_compatible(dev->of_node, "arm,pl330"))
 153                 reg = 0x20;
 154         else if (of_device_is_compatible(dev->of_node, "calxeda,hb-xgmac")) {
 155                 res = platform_get_resource(to_platform_device(dev),
 156                                             IORESOURCE_MEM, 0);
 157                 if (res) {
 158                         if (res->start == 0xfff50000)
 159                                 reg = 0;
 160                         else if (res->start == 0xfff51000)
 161                                 reg = 4;
 162                 }
 163         }
 164
 165         if (reg < 0)
 166                 return NOTIFY_DONE;
 167
 168         if (of_property_read_bool(dev->of_node, "dma-coherent")) {
 169                 writel(0xff31, sregs_base + reg);
 170                 set_dma_ops(dev, &arm_coherent_dma_ops);
 171         } else
 172                 writel(0, sregs_base + reg);
 173
 174         return NOTIFY_OK;
 175 }
 176
 177 static struct notifier_block highbank_amba_nb = {
 178         .notifier_call = highbank_platform_notifier,
 179 };
 180
 181 static struct notifier_block highbank_platform_nb = {
 182         .notifier_call = highbank_platform_notifier,
 183 };
 184
 185 static void __init highbank_init(void)
 186 {
 187         pm_power_off = highbank_power_off;
 188         highbank_pm_init();
 189
 190         bus_register_notifier(&platform_bus_type, &highbank_platform_nb);
 191         bus_register_notifier(&amba_bustype, &highbank_amba_nb);
 192
 193         of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
 194 }
 195
 196 static const char *highbank_match[] __initconst = {
 197         "calxeda,highbank",
 198         "calxeda,ecx-2000",
 199         NULL,
 200 };
 201
 202 DT_MACHINE_START(HIGHBANK, "Highbank")
 203         .smp            = smp_ops(highbank_smp_ops),
 204         .map_io         = debug_ll_io_init,
 205         .init_irq       = highbank_init_irq,
 206         .timer          = &highbank_timer,
 207         .init_machine   = highbank_init,
 208         .dt_compat      = highbank_match,
 209         .restart        = highbank_restart,
 210 MACHINE_END