arch/arm/mach-omap2/omap4-common.c

   1 /*
   2  * OMAP4 specific common source file.
   3  *
   4  * Copyright (C) 2010 Texas Instruments, Inc.
   5  * Author:
   6  *      Santosh Shilimkar <santosh.shilimkar@ti.com>
   7  *
   8  *
   9  * This program is free software,you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #include <linux/kernel.h>
  15 #include <linux/init.h>
  16 #include <linux/io.h>
  17 #include <linux/irq.h>
  18 #include <linux/irqchip.h>
  19 #include <linux/platform_device.h>
  20 #include <linux/memblock.h>
  21 #include <linux/of_irq.h>
  22 #include <linux/of_platform.h>
  23 #include <linux/export.h>
  24 #include <linux/irqchip/arm-gic.h>
  25 #include <linux/irqchip/irq-crossbar.h>
  26 #include <linux/of_address.h>
  27 #include <linux/reboot.h>
  28 #include <linux/genalloc.h>
  29
  30 #include <asm/hardware/cache-l2x0.h>
  31 #include <asm/mach/map.h>
  32 #include <asm/memblock.h>
  33 #include <asm/smp_twd.h>
  34
  35 #include "omap-wakeupgen.h"
  36 #include "soc.h"
  37 #include "iomap.h"
  38 #include "common.h"
  39 #include "prminst44xx.h"
  40 #include "prcm_mpu44xx.h"
  41 #include "omap4-sar-layout.h"
  42 #include "omap-secure.h"
  43 #include "sram.h"
  44
  45 #ifdef CONFIG_CACHE_L2X0
  46 static void __iomem *l2cache_base;
  47 #endif
  48
  49 static void __iomem *sar_ram_base;
  50 static void __iomem *gic_dist_base_addr;
  51 static void __iomem *twd_base;
  52
  53 #define IRQ_LOCALTIMER          29
  54
  55 #ifdef CONFIG_OMAP4_ERRATA_I688
  56 /* Used to implement memory barrier on DRAM path */
  57 #define OMAP4_DRAM_BARRIER_VA                   0xfe600000
  58
  59 void __iomem *dram_sync, *sram_sync;
  60
  61 static phys_addr_t paddr;
  62 static u32 size;
  63
  64 void omap_bus_sync(void)
  65 {
  66         if (dram_sync && sram_sync) {
  67                 writel_relaxed(readl_relaxed(dram_sync), dram_sync);
  68                 writel_relaxed(readl_relaxed(sram_sync), sram_sync);
  69                 isb();
  70         }
  71 }
  72 EXPORT_SYMBOL(omap_bus_sync);
  73
  74 static int __init omap4_sram_init(void)
  75 {
  76         struct device_node *np;
  77         struct gen_pool *sram_pool;
  78
  79         np = of_find_compatible_node(NULL, NULL, "ti,omap4-mpu");
  80         if (!np)
  81                 pr_warn("%s:Unable to allocate sram needed to handle errata I688\n",
  82                         __func__);
  83         sram_pool = of_get_named_gen_pool(np, "sram", 0);
  84         if (!sram_pool)
  85                 pr_warn("%s:Unable to get sram pool needed to handle errata I688\n",
  86                         __func__);
  87         else
  88                 sram_sync = (void *)gen_pool_alloc(sram_pool, PAGE_SIZE);
  89
  90         return 0;
  91 }
  92 omap_arch_initcall(omap4_sram_init);
  93
  94 /* Steal one page physical memory for barrier implementation */
  95 int __init omap_barrier_reserve_memblock(void)
  96 {
  97
  98         size = ALIGN(PAGE_SIZE, SZ_1M);
  99         paddr = arm_memblock_steal(size, SZ_1M);
 100
 101         return 0;
 102 }
 103
 104 void __init omap_barriers_init(void)
 105 {
 106         struct map_desc dram_io_desc[1];
 107
 108         dram_io_desc[0].virtual = OMAP4_DRAM_BARRIER_VA;
 109         dram_io_desc[0].pfn = __phys_to_pfn(paddr);
 110         dram_io_desc[0].length = size;
 111         dram_io_desc[0].type = MT_MEMORY_RW_SO;
 112         iotable_init(dram_io_desc, ARRAY_SIZE(dram_io_desc));
 113         dram_sync = (void __iomem *) dram_io_desc[0].virtual;
 114
 115         pr_info("OMAP4: Map 0x%08llx to 0x%08lx for dram barrier\n",
 116                 (long long) paddr, dram_io_desc[0].virtual);
 117
 118 }
 119 #else
 120 void __init omap_barriers_init(void)
 121 {}
 122 #endif
 123
 124 void gic_dist_disable(void)
 125 {
 126         if (gic_dist_base_addr)
 127                 writel_relaxed(0x0, gic_dist_base_addr + GIC_DIST_CTRL);
 128 }
 129
 130 void gic_dist_enable(void)
 131 {
 132         if (gic_dist_base_addr)
 133                 writel_relaxed(0x1, gic_dist_base_addr + GIC_DIST_CTRL);
 134 }
 135
 136 bool gic_dist_disabled(void)
 137 {
 138         return !(readl_relaxed(gic_dist_base_addr + GIC_DIST_CTRL) & 0x1);
 139 }
 140
 141 void gic_timer_retrigger(void)
 142 {
 143         u32 twd_int = readl_relaxed(twd_base + TWD_TIMER_INTSTAT);
 144         u32 gic_int = readl_relaxed(gic_dist_base_addr + GIC_DIST_PENDING_SET);
 145         u32 twd_ctrl = readl_relaxed(twd_base + TWD_TIMER_CONTROL);
 146
 147         if (twd_int && !(gic_int & BIT(IRQ_LOCALTIMER))) {
 148                 /*
 149                  * The local timer interrupt got lost while the distributor was
 150                  * disabled.  Ack the pending interrupt, and retrigger it.
 151                  */
 152                 pr_warn("%s: lost localtimer interrupt\n", __func__);
 153                 writel_relaxed(1, twd_base + TWD_TIMER_INTSTAT);
 154                 if (!(twd_ctrl & TWD_TIMER_CONTROL_PERIODIC)) {
 155                         writel_relaxed(1, twd_base + TWD_TIMER_COUNTER);
 156                         twd_ctrl |= TWD_TIMER_CONTROL_ENABLE;
 157                         writel_relaxed(twd_ctrl, twd_base + TWD_TIMER_CONTROL);
 158                 }
 159         }
 160 }
 161
 162 #ifdef CONFIG_CACHE_L2X0
 163
 164 void __iomem *omap4_get_l2cache_base(void)
 165 {
 166         return l2cache_base;
 167 }
 168
 169 void omap4_l2c310_write_sec(unsigned long val, unsigned reg)
 170 {
 171         unsigned smc_op;
 172
 173         switch (reg) {
 174         case L2X0_CTRL:
 175                 smc_op = OMAP4_MON_L2X0_CTRL_INDEX;
 176                 break;
 177
 178         case L2X0_AUX_CTRL:
 179                 smc_op = OMAP4_MON_L2X0_AUXCTRL_INDEX;
 180                 break;
 181
 182         case L2X0_DEBUG_CTRL:
 183                 smc_op = OMAP4_MON_L2X0_DBG_CTRL_INDEX;
 184                 break;
 185
 186         case L310_PREFETCH_CTRL:
 187                 smc_op = OMAP4_MON_L2X0_PREFETCH_INDEX;
 188                 break;
 189
 190         case L310_POWER_CTRL:
 191                 pr_info_once("OMAP L2C310: ROM does not support power control setting\n");
 192                 return;
 193
 194         default:
 195                 WARN_ONCE(1, "OMAP L2C310: ignoring write to reg 0x%x\n", reg);
 196                 return;
 197         }
 198
 199         omap_smc1(smc_op, val);
 200 }
 201
 202 int __init omap_l2_cache_init(void)
 203 {
 204         /* Static mapping, never released */
 205         l2cache_base = ioremap(OMAP44XX_L2CACHE_BASE, SZ_4K);
 206         if (WARN_ON(!l2cache_base))
 207                 return -ENOMEM;
 208         return 0;
 209 }
 210 #endif
 211
 212 void __iomem *omap4_get_sar_ram_base(void)
 213 {
 214         return sar_ram_base;
 215 }
 216
 217 /*
 218  * SAR RAM used to save and restore the HW
 219  * context in low power modes
 220  */
 221 static int __init omap4_sar_ram_init(void)
 222 {
 223         unsigned long sar_base;
 224
 225         /*
 226          * To avoid code running on other OMAPs in
 227          * multi-omap builds
 228          */
 229         if (cpu_is_omap44xx())
 230                 sar_base = OMAP44XX_SAR_RAM_BASE;
 231         else if (soc_is_omap54xx())
 232                 sar_base = OMAP54XX_SAR_RAM_BASE;
 233         else
 234                 return -ENOMEM;
 235
 236         /* Static mapping, never released */
 237         sar_ram_base = ioremap(sar_base, SZ_16K);
 238         if (WARN_ON(!sar_ram_base))
 239                 return -ENOMEM;
 240
 241         return 0;
 242 }
 243 omap_early_initcall(omap4_sar_ram_init);
 244
 245 static struct of_device_id gic_match[] = {
 246         { .compatible = "arm,cortex-a9-gic", },
 247         { .compatible = "arm,cortex-a15-gic", },
 248         { },
 249 };
 250
 251 static struct device_node *gic_node;
 252
 253 unsigned int omap4_xlate_irq(unsigned int hwirq)
 254 {
 255         struct of_phandle_args irq_data;
 256         unsigned int irq;
 257
 258         if (!gic_node)
 259                 gic_node = of_find_matching_node(NULL, gic_match);
 260
 261         if (WARN_ON(!gic_node))
 262                 return hwirq;
 263
 264         irq_data.np = gic_node;
 265         irq_data.args_count = 3;
 266         irq_data.args[0] = 0;
 267         irq_data.args[1] = hwirq - OMAP44XX_IRQ_GIC_START;
 268         irq_data.args[2] = IRQ_TYPE_LEVEL_HIGH;
 269
 270         irq = irq_create_of_mapping(&irq_data);
 271         if (WARN_ON(!irq))
 272                 irq = hwirq;
 273
 274         return irq;
 275 }
 276
 277 void __init omap_gic_of_init(void)
 278 {
 279         struct device_node *np;
 280
 281         /* Extract GIC distributor and TWD bases for OMAP4460 ROM Errata WA */
 282         if (!cpu_is_omap446x())
 283                 goto skip_errata_init;
 284
 285         np = of_find_compatible_node(NULL, NULL, "arm,cortex-a9-gic");
 286         gic_dist_base_addr = of_iomap(np, 0);
 287         WARN_ON(!gic_dist_base_addr);
 288
 289         np = of_find_compatible_node(NULL, NULL, "arm,cortex-a9-twd-timer");
 290         twd_base = of_iomap(np, 0);
 291         WARN_ON(!twd_base);
 292
 293 skip_errata_init:
 294         omap_wakeupgen_init();
 295 #ifdef CONFIG_IRQ_CROSSBAR
 296         irqcrossbar_init();
 297 #endif
 298         irqchip_init();
 299 }