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