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 gic_dist_disable(void) 106 { 107 if (gic_dist_base_addr) 108 writel_relaxed(0x0, gic_dist_base_addr + GIC_DIST_CTRL); 109 } 110 111 void gic_dist_enable(void) 112 { 113 if (gic_dist_base_addr) 114 writel_relaxed(0x1, gic_dist_base_addr + GIC_DIST_CTRL); 115 } 116 117 bool gic_dist_disabled(void) 118 { 119 return !(readl_relaxed(gic_dist_base_addr + GIC_DIST_CTRL) & 0x1); 120 } 121 122 void gic_timer_retrigger(void) 123 { 124 u32 twd_int = readl_relaxed(twd_base + TWD_TIMER_INTSTAT); 125 u32 gic_int = readl_relaxed(gic_dist_base_addr + GIC_DIST_PENDING_SET); 126 u32 twd_ctrl = readl_relaxed(twd_base + TWD_TIMER_CONTROL); 127 128 if (twd_int && !(gic_int & BIT(IRQ_LOCALTIMER))) { 129 /* 130 * The local timer interrupt got lost while the distributor was 131 * disabled. Ack the pending interrupt, and retrigger it. 132 */ 133 pr_warn("%s: lost localtimer interrupt\n", __func__); 134 writel_relaxed(1, twd_base + TWD_TIMER_INTSTAT); 135 if (!(twd_ctrl & TWD_TIMER_CONTROL_PERIODIC)) { 136 writel_relaxed(1, twd_base + TWD_TIMER_COUNTER); 137 twd_ctrl |= TWD_TIMER_CONTROL_ENABLE; 138 writel_relaxed(twd_ctrl, twd_base + TWD_TIMER_CONTROL); 139 } 140 } 141 } 142 143 #ifdef CONFIG_CACHE_L2X0 144 145 void __iomem *omap4_get_l2cache_base(void) 146 { 147 return l2cache_base; 148 } 149 150 static void omap4_l2c310_write_sec(unsigned long val, unsigned reg) 151 { 152 unsigned smc_op; 153 154 switch (reg) { 155 case L2X0_CTRL: 156 smc_op = OMAP4_MON_L2X0_CTRL_INDEX; 157 break; 158 159 case L2X0_AUX_CTRL: 160 smc_op = OMAP4_MON_L2X0_AUXCTRL_INDEX; 161 break; 162 163 case L2X0_DEBUG_CTRL: 164 smc_op = OMAP4_MON_L2X0_DBG_CTRL_INDEX; 165 break; 166 167 case L310_PREFETCH_CTRL: 168 smc_op = OMAP4_MON_L2X0_PREFETCH_INDEX; 169 break; 170 171 default: 172 WARN_ONCE(1, "OMAP L2C310: ignoring write to reg 0x%x\n", reg); 173 return; 174 } 175 176 omap_smc1(smc_op, val); 177 } 178 179 int __init omap_l2_cache_init(void) 180 { 181 u32 aux_ctrl; 182 183 /* Static mapping, never released */ 184 l2cache_base = ioremap(OMAP44XX_L2CACHE_BASE, SZ_4K); 185 if (WARN_ON(!l2cache_base)) 186 return -ENOMEM; 187 188 /* 16-way associativity, parity disabled, way size - 64KB (es2.0 +) */ 189 aux_ctrl = L2C_AUX_CTRL_SHARED_OVERRIDE | 190 L310_AUX_CTRL_DATA_PREFETCH | 191 L310_AUX_CTRL_INSTR_PREFETCH; 192 193 outer_cache.write_sec = omap4_l2c310_write_sec; 194 if (of_have_populated_dt()) 195 l2x0_of_init(aux_ctrl, 0xcf9fffff); 196 else 197 l2x0_init(l2cache_base, aux_ctrl, 0xcf9fffff); 198 199 return 0; 200 } 201 #endif 202 203 void __iomem *omap4_get_sar_ram_base(void) 204 { 205 return sar_ram_base; 206 } 207 208 /* 209 * SAR RAM used to save and restore the HW 210 * context in low power modes 211 */ 212 static int __init omap4_sar_ram_init(void) 213 { 214 unsigned long sar_base; 215 216 /* 217 * To avoid code running on other OMAPs in 218 * multi-omap builds 219 */ 220 if (cpu_is_omap44xx()) 221 sar_base = OMAP44XX_SAR_RAM_BASE; 222 else if (soc_is_omap54xx()) 223 sar_base = OMAP54XX_SAR_RAM_BASE; 224 else 225 return -ENOMEM; 226 227 /* Static mapping, never released */ 228 sar_ram_base = ioremap(sar_base, SZ_16K); 229 if (WARN_ON(!sar_ram_base)) 230 return -ENOMEM; 231 232 return 0; 233 } 234 omap_early_initcall(omap4_sar_ram_init); 235 236 void __init omap_gic_of_init(void) 237 { 238 struct device_node *np; 239 240 /* Extract GIC distributor and TWD bases for OMAP4460 ROM Errata WA */ 241 if (!cpu_is_omap446x()) 242 goto skip_errata_init; 243 244 np = of_find_compatible_node(NULL, NULL, "arm,cortex-a9-gic"); 245 gic_dist_base_addr = of_iomap(np, 0); 246 WARN_ON(!gic_dist_base_addr); 247 248 np = of_find_compatible_node(NULL, NULL, "arm,cortex-a9-twd-timer"); 249 twd_base = of_iomap(np, 0); 250 WARN_ON(!twd_base); 251 252 skip_errata_init: 253 omap_wakeupgen_init(); 254 #ifdef CONFIG_IRQ_CROSSBAR 255 irqcrossbar_init(); 256 #endif 257 irqchip_init(); 258 } 259