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 28 #include <asm/hardware/cache-l2x0.h> 29 #include <asm/mach/map.h> 30 #include <asm/memblock.h> 31 #include <asm/smp_twd.h> 32 33 #include "omap-wakeupgen.h" 34 #include "soc.h" 35 #include "iomap.h" 36 #include "common.h" 37 #include "mmc.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 #ifdef CONFIG_OMAP4_ERRATA_I688 55 /* Used to implement memory barrier on DRAM path */ 56 #define OMAP4_DRAM_BARRIER_VA 0xfe600000 57 58 void __iomem *dram_sync, *sram_sync; 59 60 static phys_addr_t paddr; 61 static u32 size; 62 63 void omap_bus_sync(void) 64 { 65 if (dram_sync && sram_sync) { 66 writel_relaxed(readl_relaxed(dram_sync), dram_sync); 67 writel_relaxed(readl_relaxed(sram_sync), sram_sync); 68 isb(); 69 } 70 } 71 EXPORT_SYMBOL(omap_bus_sync); 72 73 /* Steal one page physical memory for barrier implementation */ 74 int __init omap_barrier_reserve_memblock(void) 75 { 76 77 size = ALIGN(PAGE_SIZE, SZ_1M); 78 paddr = arm_memblock_steal(size, SZ_1M); 79 80 return 0; 81 } 82 83 void __init omap_barriers_init(void) 84 { 85 struct map_desc dram_io_desc[1]; 86 87 dram_io_desc[0].virtual = OMAP4_DRAM_BARRIER_VA; 88 dram_io_desc[0].pfn = __phys_to_pfn(paddr); 89 dram_io_desc[0].length = size; 90 dram_io_desc[0].type = MT_MEMORY_SO; 91 iotable_init(dram_io_desc, ARRAY_SIZE(dram_io_desc)); 92 dram_sync = (void __iomem *) dram_io_desc[0].virtual; 93 sram_sync = (void __iomem *) OMAP4_SRAM_VA; 94 95 pr_info("OMAP4: Map 0x%08llx to 0x%08lx for dram barrier\n", 96 (long long) paddr, dram_io_desc[0].virtual); 97 98 } 99 #else 100 void __init omap_barriers_init(void) 101 {} 102 #endif 103 104 void __init gic_init_irq(void) 105 { 106 void __iomem *omap_irq_base; 107 108 /* Static mapping, never released */ 109 gic_dist_base_addr = ioremap(OMAP44XX_GIC_DIST_BASE, SZ_4K); 110 BUG_ON(!gic_dist_base_addr); 111 112 twd_base = ioremap(OMAP44XX_LOCAL_TWD_BASE, SZ_4K); 113 BUG_ON(!twd_base); 114 115 /* Static mapping, never released */ 116 omap_irq_base = ioremap(OMAP44XX_GIC_CPU_BASE, SZ_512); 117 BUG_ON(!omap_irq_base); 118 119 omap_wakeupgen_init(); 120 121 gic_init(0, 29, gic_dist_base_addr, omap_irq_base); 122 } 123 124 void gic_dist_disable(void) 125 { 126 if (gic_dist_base_addr) 127 __raw_writel(0x0, gic_dist_base_addr + GIC_DIST_CTRL); 128 } 129 130 bool gic_dist_disabled(void) 131 { 132 return !(__raw_readl(gic_dist_base_addr + GIC_DIST_CTRL) & 0x1); 133 } 134 135 void gic_timer_retrigger(void) 136 { 137 u32 twd_int = __raw_readl(twd_base + TWD_TIMER_INTSTAT); 138 u32 gic_int = __raw_readl(gic_dist_base_addr + GIC_DIST_PENDING_SET); 139 u32 twd_ctrl = __raw_readl(twd_base + TWD_TIMER_CONTROL); 140 141 if (twd_int && !(gic_int & BIT(IRQ_LOCALTIMER))) { 142 /* 143 * The local timer interrupt got lost while the distributor was 144 * disabled. Ack the pending interrupt, and retrigger it. 145 */ 146 pr_warn("%s: lost localtimer interrupt\n", __func__); 147 __raw_writel(1, twd_base + TWD_TIMER_INTSTAT); 148 if (!(twd_ctrl & TWD_TIMER_CONTROL_PERIODIC)) { 149 __raw_writel(1, twd_base + TWD_TIMER_COUNTER); 150 twd_ctrl |= TWD_TIMER_CONTROL_ENABLE; 151 __raw_writel(twd_ctrl, twd_base + TWD_TIMER_CONTROL); 152 } 153 } 154 } 155 156 #ifdef CONFIG_CACHE_L2X0 157 158 void __iomem *omap4_get_l2cache_base(void) 159 { 160 return l2cache_base; 161 } 162 163 static void omap4_l2x0_disable(void) 164 { 165 /* Disable PL310 L2 Cache controller */ 166 omap_smc1(0x102, 0x0); 167 } 168 169 static void omap4_l2x0_set_debug(unsigned long val) 170 { 171 /* Program PL310 L2 Cache controller debug register */ 172 omap_smc1(0x100, val); 173 } 174 175 static int __init omap_l2_cache_init(void) 176 { 177 u32 aux_ctrl = 0; 178 179 /* 180 * To avoid code running on other OMAPs in 181 * multi-omap builds 182 */ 183 if (!cpu_is_omap44xx()) 184 return -ENODEV; 185 186 /* Static mapping, never released */ 187 l2cache_base = ioremap(OMAP44XX_L2CACHE_BASE, SZ_4K); 188 if (WARN_ON(!l2cache_base)) 189 return -ENOMEM; 190 191 /* 192 * 16-way associativity, parity disabled 193 * Way size - 32KB (es1.0) 194 * Way size - 64KB (es2.0 +) 195 */ 196 aux_ctrl = ((1 << L2X0_AUX_CTRL_ASSOCIATIVITY_SHIFT) | 197 (0x1 << 25) | 198 (0x1 << L2X0_AUX_CTRL_NS_LOCKDOWN_SHIFT) | 199 (0x1 << L2X0_AUX_CTRL_NS_INT_CTRL_SHIFT)); 200 201 if (omap_rev() == OMAP4430_REV_ES1_0) { 202 aux_ctrl |= 0x2 << L2X0_AUX_CTRL_WAY_SIZE_SHIFT; 203 } else { 204 aux_ctrl |= ((0x3 << L2X0_AUX_CTRL_WAY_SIZE_SHIFT) | 205 (1 << L2X0_AUX_CTRL_SHARE_OVERRIDE_SHIFT) | 206 (1 << L2X0_AUX_CTRL_DATA_PREFETCH_SHIFT) | 207 (1 << L2X0_AUX_CTRL_INSTR_PREFETCH_SHIFT) | 208 (1 << L2X0_AUX_CTRL_EARLY_BRESP_SHIFT)); 209 } 210 if (omap_rev() != OMAP4430_REV_ES1_0) 211 omap_smc1(0x109, aux_ctrl); 212 213 /* Enable PL310 L2 Cache controller */ 214 omap_smc1(0x102, 0x1); 215 216 if (of_have_populated_dt()) 217 l2x0_of_init(aux_ctrl, L2X0_AUX_CTRL_MASK); 218 else 219 l2x0_init(l2cache_base, aux_ctrl, L2X0_AUX_CTRL_MASK); 220 221 /* 222 * Override default outer_cache.disable with a OMAP4 223 * specific one 224 */ 225 outer_cache.disable = omap4_l2x0_disable; 226 outer_cache.set_debug = omap4_l2x0_set_debug; 227 228 return 0; 229 } 230 omap_early_initcall(omap_l2_cache_init); 231 #endif 232 233 void __iomem *omap4_get_sar_ram_base(void) 234 { 235 return sar_ram_base; 236 } 237 238 /* 239 * SAR RAM used to save and restore the HW 240 * context in low power modes 241 */ 242 static int __init omap4_sar_ram_init(void) 243 { 244 unsigned long sar_base; 245 246 /* 247 * To avoid code running on other OMAPs in 248 * multi-omap builds 249 */ 250 if (cpu_is_omap44xx()) 251 sar_base = OMAP44XX_SAR_RAM_BASE; 252 else if (soc_is_omap54xx()) 253 sar_base = OMAP54XX_SAR_RAM_BASE; 254 else 255 return -ENOMEM; 256 257 /* Static mapping, never released */ 258 sar_ram_base = ioremap(sar_base, SZ_16K); 259 if (WARN_ON(!sar_ram_base)) 260 return -ENOMEM; 261 262 return 0; 263 } 264 omap_early_initcall(omap4_sar_ram_init); 265 266 void __init omap_gic_of_init(void) 267 { 268 struct device_node *np; 269 270 /* Extract GIC distributor and TWD bases for OMAP4460 ROM Errata WA */ 271 if (!cpu_is_omap446x()) 272 goto skip_errata_init; 273 274 np = of_find_compatible_node(NULL, NULL, "arm,cortex-a9-gic"); 275 gic_dist_base_addr = of_iomap(np, 0); 276 WARN_ON(!gic_dist_base_addr); 277 278 np = of_find_compatible_node(NULL, NULL, "arm,cortex-a9-twd-timer"); 279 twd_base = of_iomap(np, 0); 280 WARN_ON(!twd_base); 281 282 skip_errata_init: 283 omap_wakeupgen_init(); 284 irqchip_init(); 285 } 286