15f1ae4ebSFu Wei /* 25f1ae4ebSFu Wei * ARM Specific GTDT table Support 35f1ae4ebSFu Wei * 45f1ae4ebSFu Wei * Copyright (C) 2016, Linaro Ltd. 55f1ae4ebSFu Wei * Author: Daniel Lezcano <daniel.lezcano@linaro.org> 65f1ae4ebSFu Wei * Fu Wei <fu.wei@linaro.org> 75f1ae4ebSFu Wei * Hanjun Guo <hanjun.guo@linaro.org> 85f1ae4ebSFu Wei * 95f1ae4ebSFu Wei * This program is free software; you can redistribute it and/or modify 105f1ae4ebSFu Wei * it under the terms of the GNU General Public License version 2 as 115f1ae4ebSFu Wei * published by the Free Software Foundation. 125f1ae4ebSFu Wei */ 135f1ae4ebSFu Wei 145f1ae4ebSFu Wei #include <linux/acpi.h> 155f1ae4ebSFu Wei #include <linux/init.h> 16a712c3edSFu Wei #include <linux/irqdomain.h> 175f1ae4ebSFu Wei #include <linux/kernel.h> 185f1ae4ebSFu Wei 195f1ae4ebSFu Wei #include <clocksource/arm_arch_timer.h> 205f1ae4ebSFu Wei 215f1ae4ebSFu Wei #undef pr_fmt 225f1ae4ebSFu Wei #define pr_fmt(fmt) "ACPI GTDT: " fmt 235f1ae4ebSFu Wei 245f1ae4ebSFu Wei /** 255f1ae4ebSFu Wei * struct acpi_gtdt_descriptor - Store the key info of GTDT for all functions 265f1ae4ebSFu Wei * @gtdt: The pointer to the struct acpi_table_gtdt of GTDT table. 275f1ae4ebSFu Wei * @gtdt_end: The pointer to the end of GTDT table. 285f1ae4ebSFu Wei * @platform_timer: The pointer to the start of Platform Timer Structure 295f1ae4ebSFu Wei * 305f1ae4ebSFu Wei * The struct store the key info of GTDT table, it should be initialized by 315f1ae4ebSFu Wei * acpi_gtdt_init. 325f1ae4ebSFu Wei */ 335f1ae4ebSFu Wei struct acpi_gtdt_descriptor { 345f1ae4ebSFu Wei struct acpi_table_gtdt *gtdt; 355f1ae4ebSFu Wei void *gtdt_end; 365f1ae4ebSFu Wei void *platform_timer; 375f1ae4ebSFu Wei }; 385f1ae4ebSFu Wei 395f1ae4ebSFu Wei static struct acpi_gtdt_descriptor acpi_gtdt_desc __initdata; 405f1ae4ebSFu Wei 41a712c3edSFu Wei static inline void *next_platform_timer(void *platform_timer) 42a712c3edSFu Wei { 43a712c3edSFu Wei struct acpi_gtdt_header *gh = platform_timer; 44a712c3edSFu Wei 45a712c3edSFu Wei platform_timer += gh->length; 46a712c3edSFu Wei if (platform_timer < acpi_gtdt_desc.gtdt_end) 47a712c3edSFu Wei return platform_timer; 48a712c3edSFu Wei 49a712c3edSFu Wei return NULL; 50a712c3edSFu Wei } 51a712c3edSFu Wei 52a712c3edSFu Wei #define for_each_platform_timer(_g) \ 53a712c3edSFu Wei for (_g = acpi_gtdt_desc.platform_timer; _g; \ 54a712c3edSFu Wei _g = next_platform_timer(_g)) 55a712c3edSFu Wei 56a712c3edSFu Wei static inline bool is_timer_block(void *platform_timer) 57a712c3edSFu Wei { 58a712c3edSFu Wei struct acpi_gtdt_header *gh = platform_timer; 59a712c3edSFu Wei 60a712c3edSFu Wei return gh->type == ACPI_GTDT_TYPE_TIMER_BLOCK; 61a712c3edSFu Wei } 62a712c3edSFu Wei 635f1ae4ebSFu Wei static int __init map_gt_gsi(u32 interrupt, u32 flags) 645f1ae4ebSFu Wei { 655f1ae4ebSFu Wei int trigger, polarity; 665f1ae4ebSFu Wei 675f1ae4ebSFu Wei trigger = (flags & ACPI_GTDT_INTERRUPT_MODE) ? ACPI_EDGE_SENSITIVE 685f1ae4ebSFu Wei : ACPI_LEVEL_SENSITIVE; 695f1ae4ebSFu Wei 705f1ae4ebSFu Wei polarity = (flags & ACPI_GTDT_INTERRUPT_POLARITY) ? ACPI_ACTIVE_LOW 715f1ae4ebSFu Wei : ACPI_ACTIVE_HIGH; 725f1ae4ebSFu Wei 735f1ae4ebSFu Wei return acpi_register_gsi(NULL, interrupt, trigger, polarity); 745f1ae4ebSFu Wei } 755f1ae4ebSFu Wei 765f1ae4ebSFu Wei /** 775f1ae4ebSFu Wei * acpi_gtdt_map_ppi() - Map the PPIs of per-cpu arch_timer. 785f1ae4ebSFu Wei * @type: the type of PPI. 795f1ae4ebSFu Wei * 805f1ae4ebSFu Wei * Note: Secure state is not managed by the kernel on ARM64 systems. 815f1ae4ebSFu Wei * So we only handle the non-secure timer PPIs, 825f1ae4ebSFu Wei * ARCH_TIMER_PHYS_SECURE_PPI is treated as invalid type. 835f1ae4ebSFu Wei * 845f1ae4ebSFu Wei * Return: the mapped PPI value, 0 if error. 855f1ae4ebSFu Wei */ 865f1ae4ebSFu Wei int __init acpi_gtdt_map_ppi(int type) 875f1ae4ebSFu Wei { 885f1ae4ebSFu Wei struct acpi_table_gtdt *gtdt = acpi_gtdt_desc.gtdt; 895f1ae4ebSFu Wei 905f1ae4ebSFu Wei switch (type) { 915f1ae4ebSFu Wei case ARCH_TIMER_PHYS_NONSECURE_PPI: 925f1ae4ebSFu Wei return map_gt_gsi(gtdt->non_secure_el1_interrupt, 935f1ae4ebSFu Wei gtdt->non_secure_el1_flags); 945f1ae4ebSFu Wei case ARCH_TIMER_VIRT_PPI: 955f1ae4ebSFu Wei return map_gt_gsi(gtdt->virtual_timer_interrupt, 965f1ae4ebSFu Wei gtdt->virtual_timer_flags); 975f1ae4ebSFu Wei 985f1ae4ebSFu Wei case ARCH_TIMER_HYP_PPI: 995f1ae4ebSFu Wei return map_gt_gsi(gtdt->non_secure_el2_interrupt, 1005f1ae4ebSFu Wei gtdt->non_secure_el2_flags); 1015f1ae4ebSFu Wei default: 1025f1ae4ebSFu Wei pr_err("Failed to map timer interrupt: invalid type.\n"); 1035f1ae4ebSFu Wei } 1045f1ae4ebSFu Wei 1055f1ae4ebSFu Wei return 0; 1065f1ae4ebSFu Wei } 1075f1ae4ebSFu Wei 1085f1ae4ebSFu Wei /** 1095f1ae4ebSFu Wei * acpi_gtdt_c3stop() - Got c3stop info from GTDT according to the type of PPI. 1105f1ae4ebSFu Wei * @type: the type of PPI. 1115f1ae4ebSFu Wei * 1125f1ae4ebSFu Wei * Return: true if the timer HW state is lost when a CPU enters an idle state, 1135f1ae4ebSFu Wei * false otherwise 1145f1ae4ebSFu Wei */ 1155f1ae4ebSFu Wei bool __init acpi_gtdt_c3stop(int type) 1165f1ae4ebSFu Wei { 1175f1ae4ebSFu Wei struct acpi_table_gtdt *gtdt = acpi_gtdt_desc.gtdt; 1185f1ae4ebSFu Wei 1195f1ae4ebSFu Wei switch (type) { 1205f1ae4ebSFu Wei case ARCH_TIMER_PHYS_NONSECURE_PPI: 1215f1ae4ebSFu Wei return !(gtdt->non_secure_el1_flags & ACPI_GTDT_ALWAYS_ON); 1225f1ae4ebSFu Wei 1235f1ae4ebSFu Wei case ARCH_TIMER_VIRT_PPI: 1245f1ae4ebSFu Wei return !(gtdt->virtual_timer_flags & ACPI_GTDT_ALWAYS_ON); 1255f1ae4ebSFu Wei 1265f1ae4ebSFu Wei case ARCH_TIMER_HYP_PPI: 1275f1ae4ebSFu Wei return !(gtdt->non_secure_el2_flags & ACPI_GTDT_ALWAYS_ON); 1285f1ae4ebSFu Wei 1295f1ae4ebSFu Wei default: 1305f1ae4ebSFu Wei pr_err("Failed to get c3stop info: invalid type.\n"); 1315f1ae4ebSFu Wei } 1325f1ae4ebSFu Wei 1335f1ae4ebSFu Wei return false; 1345f1ae4ebSFu Wei } 1355f1ae4ebSFu Wei 1365f1ae4ebSFu Wei /** 1375f1ae4ebSFu Wei * acpi_gtdt_init() - Get the info of GTDT table to prepare for further init. 1385f1ae4ebSFu Wei * @table: The pointer to GTDT table. 1395f1ae4ebSFu Wei * @platform_timer_count: It points to a integer variable which is used 1405f1ae4ebSFu Wei * for storing the number of platform timers. 1415f1ae4ebSFu Wei * This pointer could be NULL, if the caller 1425f1ae4ebSFu Wei * doesn't need this info. 1435f1ae4ebSFu Wei * 1445f1ae4ebSFu Wei * Return: 0 if success, -EINVAL if error. 1455f1ae4ebSFu Wei */ 1465f1ae4ebSFu Wei int __init acpi_gtdt_init(struct acpi_table_header *table, 1475f1ae4ebSFu Wei int *platform_timer_count) 1485f1ae4ebSFu Wei { 1495f1ae4ebSFu Wei void *platform_timer; 1505f1ae4ebSFu Wei struct acpi_table_gtdt *gtdt; 1515f1ae4ebSFu Wei 1525f1ae4ebSFu Wei gtdt = container_of(table, struct acpi_table_gtdt, header); 1535f1ae4ebSFu Wei acpi_gtdt_desc.gtdt = gtdt; 1545f1ae4ebSFu Wei acpi_gtdt_desc.gtdt_end = (void *)table + table->length; 1555f1ae4ebSFu Wei acpi_gtdt_desc.platform_timer = NULL; 1565f1ae4ebSFu Wei if (platform_timer_count) 1575f1ae4ebSFu Wei *platform_timer_count = 0; 1585f1ae4ebSFu Wei 1595f1ae4ebSFu Wei if (table->revision < 2) { 1605f1ae4ebSFu Wei pr_warn("Revision:%d doesn't support Platform Timers.\n", 1615f1ae4ebSFu Wei table->revision); 1625f1ae4ebSFu Wei return 0; 1635f1ae4ebSFu Wei } 1645f1ae4ebSFu Wei 1655f1ae4ebSFu Wei if (!gtdt->platform_timer_count) { 1665f1ae4ebSFu Wei pr_debug("No Platform Timer.\n"); 1675f1ae4ebSFu Wei return 0; 1685f1ae4ebSFu Wei } 1695f1ae4ebSFu Wei 1705f1ae4ebSFu Wei platform_timer = (void *)gtdt + gtdt->platform_timer_offset; 1715f1ae4ebSFu Wei if (platform_timer < (void *)table + sizeof(struct acpi_table_gtdt)) { 1725f1ae4ebSFu Wei pr_err(FW_BUG "invalid timer data.\n"); 1735f1ae4ebSFu Wei return -EINVAL; 1745f1ae4ebSFu Wei } 1755f1ae4ebSFu Wei acpi_gtdt_desc.platform_timer = platform_timer; 1765f1ae4ebSFu Wei if (platform_timer_count) 1775f1ae4ebSFu Wei *platform_timer_count = gtdt->platform_timer_count; 1785f1ae4ebSFu Wei 1795f1ae4ebSFu Wei return 0; 1805f1ae4ebSFu Wei } 181a712c3edSFu Wei 182a712c3edSFu Wei static int __init gtdt_parse_timer_block(struct acpi_gtdt_timer_block *block, 183a712c3edSFu Wei struct arch_timer_mem *timer_mem) 184a712c3edSFu Wei { 185a712c3edSFu Wei int i; 186a712c3edSFu Wei struct arch_timer_mem_frame *frame; 187a712c3edSFu Wei struct acpi_gtdt_timer_entry *gtdt_frame; 188a712c3edSFu Wei 189a712c3edSFu Wei if (!block->timer_count) { 190a712c3edSFu Wei pr_err(FW_BUG "GT block present, but frame count is zero."); 191a712c3edSFu Wei return -ENODEV; 192a712c3edSFu Wei } 193a712c3edSFu Wei 194a712c3edSFu Wei if (block->timer_count > ARCH_TIMER_MEM_MAX_FRAMES) { 195a712c3edSFu Wei pr_err(FW_BUG "GT block lists %d frames, ACPI spec only allows 8\n", 196a712c3edSFu Wei block->timer_count); 197a712c3edSFu Wei return -EINVAL; 198a712c3edSFu Wei } 199a712c3edSFu Wei 200a712c3edSFu Wei timer_mem->cntctlbase = (phys_addr_t)block->block_address; 201a712c3edSFu Wei /* 202a712c3edSFu Wei * The CNTCTLBase frame is 4KB (register offsets 0x000 - 0xFFC). 203a712c3edSFu Wei * See ARM DDI 0487A.k_iss10775, page I1-5129, Table I1-3 204a712c3edSFu Wei * "CNTCTLBase memory map". 205a712c3edSFu Wei */ 206a712c3edSFu Wei timer_mem->size = SZ_4K; 207a712c3edSFu Wei 208a712c3edSFu Wei gtdt_frame = (void *)block + block->timer_offset; 209a712c3edSFu Wei if (gtdt_frame + block->timer_count != (void *)block + block->header.length) 210a712c3edSFu Wei return -EINVAL; 211a712c3edSFu Wei 212a712c3edSFu Wei /* 213a712c3edSFu Wei * Get the GT timer Frame data for every GT Block Timer 214a712c3edSFu Wei */ 215a712c3edSFu Wei for (i = 0; i < block->timer_count; i++, gtdt_frame++) { 216a712c3edSFu Wei if (gtdt_frame->common_flags & ACPI_GTDT_GT_IS_SECURE_TIMER) 217a712c3edSFu Wei continue; 218a712c3edSFu Wei if (gtdt_frame->frame_number >= ARCH_TIMER_MEM_MAX_FRAMES || 219a712c3edSFu Wei !gtdt_frame->base_address || !gtdt_frame->timer_interrupt) 220a712c3edSFu Wei goto error; 221a712c3edSFu Wei 222a712c3edSFu Wei frame = &timer_mem->frame[gtdt_frame->frame_number]; 223a712c3edSFu Wei 224a712c3edSFu Wei /* duplicate frame */ 225a712c3edSFu Wei if (frame->valid) 226a712c3edSFu Wei goto error; 227a712c3edSFu Wei 228a712c3edSFu Wei frame->phys_irq = map_gt_gsi(gtdt_frame->timer_interrupt, 229a712c3edSFu Wei gtdt_frame->timer_flags); 230a712c3edSFu Wei if (frame->phys_irq <= 0) { 231a712c3edSFu Wei pr_warn("failed to map physical timer irq in frame %d.\n", 232a712c3edSFu Wei gtdt_frame->frame_number); 233a712c3edSFu Wei goto error; 234a712c3edSFu Wei } 235a712c3edSFu Wei 236a712c3edSFu Wei if (gtdt_frame->virtual_timer_interrupt) { 237a712c3edSFu Wei frame->virt_irq = 238a712c3edSFu Wei map_gt_gsi(gtdt_frame->virtual_timer_interrupt, 239a712c3edSFu Wei gtdt_frame->virtual_timer_flags); 240a712c3edSFu Wei if (frame->virt_irq <= 0) { 241a712c3edSFu Wei pr_warn("failed to map virtual timer irq in frame %d.\n", 242a712c3edSFu Wei gtdt_frame->frame_number); 243a712c3edSFu Wei goto error; 244a712c3edSFu Wei } 245a712c3edSFu Wei } else { 246a712c3edSFu Wei pr_debug("virtual timer in frame %d not implemented.\n", 247a712c3edSFu Wei gtdt_frame->frame_number); 248a712c3edSFu Wei } 249a712c3edSFu Wei 250a712c3edSFu Wei frame->cntbase = gtdt_frame->base_address; 251a712c3edSFu Wei /* 252a712c3edSFu Wei * The CNTBaseN frame is 4KB (register offsets 0x000 - 0xFFC). 253a712c3edSFu Wei * See ARM DDI 0487A.k_iss10775, page I1-5130, Table I1-4 254a712c3edSFu Wei * "CNTBaseN memory map". 255a712c3edSFu Wei */ 256a712c3edSFu Wei frame->size = SZ_4K; 257a712c3edSFu Wei frame->valid = true; 258a712c3edSFu Wei } 259a712c3edSFu Wei 260a712c3edSFu Wei return 0; 261a712c3edSFu Wei 262a712c3edSFu Wei error: 263a712c3edSFu Wei do { 264a712c3edSFu Wei if (gtdt_frame->common_flags & ACPI_GTDT_GT_IS_SECURE_TIMER || 265a712c3edSFu Wei gtdt_frame->frame_number >= ARCH_TIMER_MEM_MAX_FRAMES) 266a712c3edSFu Wei continue; 267a712c3edSFu Wei 268a712c3edSFu Wei frame = &timer_mem->frame[gtdt_frame->frame_number]; 269a712c3edSFu Wei 270a712c3edSFu Wei if (frame->phys_irq > 0) 271a712c3edSFu Wei acpi_unregister_gsi(gtdt_frame->timer_interrupt); 272a712c3edSFu Wei frame->phys_irq = 0; 273a712c3edSFu Wei 274a712c3edSFu Wei if (frame->virt_irq > 0) 275a712c3edSFu Wei acpi_unregister_gsi(gtdt_frame->virtual_timer_interrupt); 276a712c3edSFu Wei frame->virt_irq = 0; 277a712c3edSFu Wei } while (i-- >= 0 && gtdt_frame--); 278a712c3edSFu Wei 279a712c3edSFu Wei return -EINVAL; 280a712c3edSFu Wei } 281a712c3edSFu Wei 282a712c3edSFu Wei /** 283a712c3edSFu Wei * acpi_arch_timer_mem_init() - Get the info of all GT blocks in GTDT table. 284a712c3edSFu Wei * @timer_mem: The pointer to the array of struct arch_timer_mem for returning 285a712c3edSFu Wei * the result of parsing. The element number of this array should 286a712c3edSFu Wei * be platform_timer_count(the total number of platform timers). 287a712c3edSFu Wei * @timer_count: It points to a integer variable which is used for storing the 288a712c3edSFu Wei * number of GT blocks we have parsed. 289a712c3edSFu Wei * 290a712c3edSFu Wei * Return: 0 if success, -EINVAL/-ENODEV if error. 291a712c3edSFu Wei */ 292a712c3edSFu Wei int __init acpi_arch_timer_mem_init(struct arch_timer_mem *timer_mem, 293a712c3edSFu Wei int *timer_count) 294a712c3edSFu Wei { 295a712c3edSFu Wei int ret; 296a712c3edSFu Wei void *platform_timer; 297a712c3edSFu Wei 298a712c3edSFu Wei *timer_count = 0; 299a712c3edSFu Wei for_each_platform_timer(platform_timer) { 300a712c3edSFu Wei if (is_timer_block(platform_timer)) { 301a712c3edSFu Wei ret = gtdt_parse_timer_block(platform_timer, timer_mem); 302a712c3edSFu Wei if (ret) 303a712c3edSFu Wei return ret; 304a712c3edSFu Wei timer_mem++; 305a712c3edSFu Wei (*timer_count)++; 306a712c3edSFu Wei } 307a712c3edSFu Wei } 308a712c3edSFu Wei 309a712c3edSFu Wei if (*timer_count) 310a712c3edSFu Wei pr_info("found %d memory-mapped timer block(s).\n", 311a712c3edSFu Wei *timer_count); 312a712c3edSFu Wei 313a712c3edSFu Wei return 0; 314a712c3edSFu Wei } 315