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
  29 #include <asm/hardware/cache-l2x0.h>
  30 #include <asm/mach/map.h>
  31 #include <asm/memblock.h>
  32 #include <asm/smp_twd.h>
  33
  34 #include "omap-wakeupgen.h"
  35 #include "soc.h"
  36 #include "iomap.h"
  37 #include "common.h"
  38 #include "mmc.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 /* Steal one page physical memory for barrier implementation */
  75 int __init omap_barrier_reserve_memblock(void)
  76 {
  77
  78         size = ALIGN(PAGE_SIZE, SZ_1M);
  79         paddr = arm_memblock_steal(size, SZ_1M);
  80
  81         return 0;
  82 }
  83
  84 void __init omap_barriers_init(void)
  85 {
  86         struct map_desc dram_io_desc[1];
  87
  88         dram_io_desc[0].virtual = OMAP4_DRAM_BARRIER_VA;
  89         dram_io_desc[0].pfn = __phys_to_pfn(paddr);
  90         dram_io_desc[0].length = size;
  91         dram_io_desc[0].type = MT_MEMORY_RW_SO;
  92         iotable_init(dram_io_desc, ARRAY_SIZE(dram_io_desc));
  93         dram_sync = (void __iomem *) dram_io_desc[0].virtual;
  94         sram_sync = (void __iomem *) OMAP4_SRAM_VA;
  95
  96         pr_info("OMAP4: Map 0x%08llx to 0x%08lx for dram barrier\n",
  97                 (long long) paddr, dram_io_desc[0].virtual);
  98
  99 }
 100 #else
 101 void __init omap_barriers_init(void)
 102 {}
 103 #endif
 104
 105 void __init gic_init_irq(void)
 106 {
 107         void __iomem *omap_irq_base;
 108
 109         /* Static mapping, never released */
 110         gic_dist_base_addr = ioremap(OMAP44XX_GIC_DIST_BASE, SZ_4K);
 111         BUG_ON(!gic_dist_base_addr);
 112
 113         twd_base = ioremap(OMAP44XX_LOCAL_TWD_BASE, SZ_4K);
 114         BUG_ON(!twd_base);
 115
 116         /* Static mapping, never released */
 117         omap_irq_base = ioremap(OMAP44XX_GIC_CPU_BASE, SZ_512);
 118         BUG_ON(!omap_irq_base);
 119
 120         omap_wakeupgen_init();
 121
 122         gic_init(0, 29, gic_dist_base_addr, omap_irq_base);
 123 }
 124
 125 void gic_dist_disable(void)
 126 {
 127         if (gic_dist_base_addr)
 128                 writel_relaxed(0x0, gic_dist_base_addr + GIC_DIST_CTRL);
 129 }
 130
 131 void gic_dist_enable(void)
 132 {
 133         if (gic_dist_base_addr)
 134                 writel_relaxed(0x1, gic_dist_base_addr + GIC_DIST_CTRL);
 135 }
 136
 137 bool gic_dist_disabled(void)
 138 {
 139         return !(readl_relaxed(gic_dist_base_addr + GIC_DIST_CTRL) & 0x1);
 140 }
 141
 142 void gic_timer_retrigger(void)
 143 {
 144         u32 twd_int = readl_relaxed(twd_base + TWD_TIMER_INTSTAT);
 145         u32 gic_int = readl_relaxed(gic_dist_base_addr + GIC_DIST_PENDING_SET);
 146         u32 twd_ctrl = readl_relaxed(twd_base + TWD_TIMER_CONTROL);
 147
 148         if (twd_int && !(gic_int & BIT(IRQ_LOCALTIMER))) {
 149                 /*
 150                  * The local timer interrupt got lost while the distributor was
 151                  * disabled.  Ack the pending interrupt, and retrigger it.
 152                  */
 153                 pr_warn("%s: lost localtimer interrupt\n", __func__);
 154                 writel_relaxed(1, twd_base + TWD_TIMER_INTSTAT);
 155                 if (!(twd_ctrl & TWD_TIMER_CONTROL_PERIODIC)) {
 156                         writel_relaxed(1, twd_base + TWD_TIMER_COUNTER);
 157                         twd_ctrl |= TWD_TIMER_CONTROL_ENABLE;
 158                         writel_relaxed(twd_ctrl, twd_base + TWD_TIMER_CONTROL);
 159                 }
 160         }
 161 }
 162
 163 #ifdef CONFIG_CACHE_L2X0
 164
 165 void __iomem *omap4_get_l2cache_base(void)
 166 {
 167         return l2cache_base;
 168 }
 169
 170 static void omap4_l2c310_write_sec(unsigned long val, unsigned reg)
 171 {
 172         unsigned smc_op;
 173
 174         switch (reg) {
 175         case L2X0_CTRL:
 176                 smc_op = OMAP4_MON_L2X0_CTRL_INDEX;
 177                 break;
 178
 179         case L2X0_AUX_CTRL:
 180                 smc_op = OMAP4_MON_L2X0_AUXCTRL_INDEX;
 181                 break;
 182
 183         case L2X0_DEBUG_CTRL:
 184                 smc_op = OMAP4_MON_L2X0_DBG_CTRL_INDEX;
 185                 break;
 186
 187         case L310_PREFETCH_CTRL:
 188                 smc_op = OMAP4_MON_L2X0_PREFETCH_INDEX;
 189                 break;
 190
 191         default:
 192                 WARN_ONCE(1, "OMAP L2C310: ignoring write to reg 0x%x\n", reg);
 193                 return;
 194         }
 195
 196         omap_smc1(smc_op, val);
 197 }
 198
 199 int __init omap_l2_cache_init(void)
 200 {
 201         u32 aux_ctrl;
 202
 203         /* Static mapping, never released */
 204         l2cache_base = ioremap(OMAP44XX_L2CACHE_BASE, SZ_4K);
 205         if (WARN_ON(!l2cache_base))
 206                 return -ENOMEM;
 207
 208         /* 16-way associativity, parity disabled, way size - 64KB (es2.0 +) */
 209         aux_ctrl = L2C_AUX_CTRL_SHARED_OVERRIDE |
 210                    L310_AUX_CTRL_DATA_PREFETCH |
 211                    L310_AUX_CTRL_INSTR_PREFETCH;
 212
 213         outer_cache.write_sec = omap4_l2c310_write_sec;
 214         if (of_have_populated_dt())
 215                 l2x0_of_init(aux_ctrl, 0xcf9fffff);
 216         else
 217                 l2x0_init(l2cache_base, aux_ctrl, 0xcf9fffff);
 218
 219         return 0;
 220 }
 221 #endif
 222
 223 void __iomem *omap4_get_sar_ram_base(void)
 224 {
 225         return sar_ram_base;
 226 }
 227
 228 /*
 229  * SAR RAM used to save and restore the HW
 230  * context in low power modes
 231  */
 232 static int __init omap4_sar_ram_init(void)
 233 {
 234         unsigned long sar_base;
 235
 236         /*
 237          * To avoid code running on other OMAPs in
 238          * multi-omap builds
 239          */
 240         if (cpu_is_omap44xx())
 241                 sar_base = OMAP44XX_SAR_RAM_BASE;
 242         else if (soc_is_omap54xx())
 243                 sar_base = OMAP54XX_SAR_RAM_BASE;
 244         else
 245                 return -ENOMEM;
 246
 247         /* Static mapping, never released */
 248         sar_ram_base = ioremap(sar_base, SZ_16K);
 249         if (WARN_ON(!sar_ram_base))
 250                 return -ENOMEM;
 251
 252         return 0;
 253 }
 254 omap_early_initcall(omap4_sar_ram_init);
 255
 256 void __init omap_gic_of_init(void)
 257 {
 258         struct device_node *np;
 259
 260         /* Extract GIC distributor and TWD bases for OMAP4460 ROM Errata WA */
 261         if (!cpu_is_omap446x())
 262                 goto skip_errata_init;
 263
 264         np = of_find_compatible_node(NULL, NULL, "arm,cortex-a9-gic");
 265         gic_dist_base_addr = of_iomap(np, 0);
 266         WARN_ON(!gic_dist_base_addr);
 267
 268         np = of_find_compatible_node(NULL, NULL, "arm,cortex-a9-twd-timer");
 269         twd_base = of_iomap(np, 0);
 270         WARN_ON(!twd_base);
 271
 272 skip_errata_init:
 273         omap_wakeupgen_init();
 274 #ifdef CONFIG_IRQ_CROSSBAR
 275         irqcrossbar_init();
 276 #endif
 277         irqchip_init();
 278 }