kernel/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/of_address.h>
  26 #include <linux/reboot.h>
  27 #include <linux/genalloc.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 "prminst44xx.h"
  39 #include "prcm_mpu44xx.h"
  40 #include "omap4-sar-layout.h"
  41 #include "omap-secure.h"
  42 #include "sram.h"
  43
  44 #ifdef CONFIG_CACHE_L2X0
  45 static void __iomem *l2cache_base;
  46 #endif
  47
  48 static void __iomem *sar_ram_base;
  49 static void __iomem *gic_dist_base_addr;
  50 static void __iomem *twd_base;
  51
  52 #define IRQ_LOCALTIMER          29
  53
  54 void gic_dist_disable(void)
  55 {
  56         if (gic_dist_base_addr)
  57                 writel_relaxed(0x0, gic_dist_base_addr + GIC_DIST_CTRL);
  58 }
  59
  60 void gic_dist_enable(void)
  61 {
  62         if (gic_dist_base_addr)
  63                 writel_relaxed(0x1, gic_dist_base_addr + GIC_DIST_CTRL);
  64 }
  65
  66 bool gic_dist_disabled(void)
  67 {
  68         return !(readl_relaxed(gic_dist_base_addr + GIC_DIST_CTRL) & 0x1);
  69 }
  70
  71 void gic_timer_retrigger(void)
  72 {
  73         u32 twd_int = readl_relaxed(twd_base + TWD_TIMER_INTSTAT);
  74         u32 gic_int = readl_relaxed(gic_dist_base_addr + GIC_DIST_PENDING_SET);
  75         u32 twd_ctrl = readl_relaxed(twd_base + TWD_TIMER_CONTROL);
  76
  77         if (twd_int && !(gic_int & BIT(IRQ_LOCALTIMER))) {
  78                 /*
  79                  * The local timer interrupt got lost while the distributor was
  80                  * disabled.  Ack the pending interrupt, and retrigger it.
  81                  */
  82                 pr_warn("%s: lost localtimer interrupt\n", __func__);
  83                 writel_relaxed(1, twd_base + TWD_TIMER_INTSTAT);
  84                 if (!(twd_ctrl & TWD_TIMER_CONTROL_PERIODIC)) {
  85                         writel_relaxed(1, twd_base + TWD_TIMER_COUNTER);
  86                         twd_ctrl |= TWD_TIMER_CONTROL_ENABLE;
  87                         writel_relaxed(twd_ctrl, twd_base + TWD_TIMER_CONTROL);
  88                 }
  89         }
  90 }
  91
  92 #ifdef CONFIG_CACHE_L2X0
  93
  94 void __iomem *omap4_get_l2cache_base(void)
  95 {
  96         return l2cache_base;
  97 }
  98
  99 void omap4_l2c310_write_sec(unsigned long val, unsigned reg)
 100 {
 101         unsigned smc_op;
 102
 103         switch (reg) {
 104         case L2X0_CTRL:
 105                 smc_op = OMAP4_MON_L2X0_CTRL_INDEX;
 106                 break;
 107
 108         case L2X0_AUX_CTRL:
 109                 smc_op = OMAP4_MON_L2X0_AUXCTRL_INDEX;
 110                 break;
 111
 112         case L2X0_DEBUG_CTRL:
 113                 smc_op = OMAP4_MON_L2X0_DBG_CTRL_INDEX;
 114                 break;
 115
 116         case L310_PREFETCH_CTRL:
 117                 smc_op = OMAP4_MON_L2X0_PREFETCH_INDEX;
 118                 break;
 119
 120         case L310_POWER_CTRL:
 121                 pr_info_once("OMAP L2C310: ROM does not support power control setting\n");
 122                 return;
 123
 124         default:
 125                 WARN_ONCE(1, "OMAP L2C310: ignoring write to reg 0x%x\n", reg);
 126                 return;
 127         }
 128
 129         omap_smc1(smc_op, val);
 130 }
 131
 132 int __init omap_l2_cache_init(void)
 133 {
 134         /* Static mapping, never released */
 135         l2cache_base = ioremap(OMAP44XX_L2CACHE_BASE, SZ_4K);
 136         if (WARN_ON(!l2cache_base))
 137                 return -ENOMEM;
 138         return 0;
 139 }
 140 #endif
 141
 142 void __iomem *omap4_get_sar_ram_base(void)
 143 {
 144         return sar_ram_base;
 145 }
 146
 147 /*
 148  * SAR RAM used to save and restore the HW
 149  * context in low power modes
 150  */
 151 static int __init omap4_sar_ram_init(void)
 152 {
 153         unsigned long sar_base;
 154
 155         /*
 156          * To avoid code running on other OMAPs in
 157          * multi-omap builds
 158          */
 159         if (cpu_is_omap44xx())
 160                 sar_base = OMAP44XX_SAR_RAM_BASE;
 161         else if (soc_is_omap54xx())
 162                 sar_base = OMAP54XX_SAR_RAM_BASE;
 163         else
 164                 return -ENOMEM;
 165
 166         /* Static mapping, never released */
 167         sar_ram_base = ioremap(sar_base, SZ_16K);
 168         if (WARN_ON(!sar_ram_base))
 169                 return -ENOMEM;
 170
 171         return 0;
 172 }
 173 omap_early_initcall(omap4_sar_ram_init);
 174
 175 static const struct of_device_id intc_match[] = {
 176         { .compatible = "ti,omap4-wugen-mpu", },
 177         { .compatible = "ti,omap5-wugen-mpu", },
 178         { },
 179 };
 180
 181 static struct device_node *intc_node;
 182
 183 unsigned int omap4_xlate_irq(unsigned int hwirq)
 184 {
 185         struct of_phandle_args irq_data;
 186         unsigned int irq;
 187
 188         if (!intc_node)
 189                 intc_node = of_find_matching_node(NULL, intc_match);
 190
 191         if (WARN_ON(!intc_node))
 192                 return hwirq;
 193
 194         irq_data.np = intc_node;
 195         irq_data.args_count = 3;
 196         irq_data.args[0] = 0;
 197         irq_data.args[1] = hwirq - OMAP44XX_IRQ_GIC_START;
 198         irq_data.args[2] = IRQ_TYPE_LEVEL_HIGH;
 199
 200         irq = irq_create_of_mapping(&irq_data);
 201         if (WARN_ON(!irq))
 202                 irq = hwirq;
 203
 204         return irq;
 205 }
 206
 207 void __init omap_gic_of_init(void)
 208 {
 209         struct device_node *np;
 210
 211         intc_node = of_find_matching_node(NULL, intc_match);
 212         if (WARN_ON(!intc_node)) {
 213                 pr_err("No WUGEN found in DT, system will misbehave.\n");
 214                 pr_err("UPDATE YOUR DEVICE TREE!\n");
 215         }
 216
 217         /* Extract GIC distributor and TWD bases for OMAP4460 ROM Errata WA */
 218         if (!cpu_is_omap446x())
 219                 goto skip_errata_init;
 220
 221         np = of_find_compatible_node(NULL, NULL, "arm,cortex-a9-gic");
 222         gic_dist_base_addr = of_iomap(np, 0);
 223         WARN_ON(!gic_dist_base_addr);
 224
 225         np = of_find_compatible_node(NULL, NULL, "arm,cortex-a9-twd-timer");
 226         twd_base = of_iomap(np, 0);
 227         WARN_ON(!twd_base);
 228
 229 skip_errata_init:
 230         irqchip_init();
 231 }