diff options
Diffstat (limited to 'kernel/arch/arm/mm/cache-uniphier.c')
| -rw-r--r-- | kernel/arch/arm/mm/cache-uniphier.c | 555 |
1 files changed, 555 insertions, 0 deletions
diff --git a/kernel/arch/arm/mm/cache-uniphier.c b/kernel/arch/arm/mm/cache-uniphier.c new file mode 100644 index 000000000..0502ba17a --- /dev/null +++ b/kernel/arch/arm/mm/cache-uniphier.c @@ -0,0 +1,555 @@ +/* + * Copyright (C) 2015 Masahiro Yamada <yamada.masahiro@socionext.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#define pr_fmt(fmt) "uniphier: " fmt + +#include <linux/init.h> +#include <linux/io.h> +#include <linux/log2.h> +#include <linux/of_address.h> +#include <linux/slab.h> +#include <asm/hardware/cache-uniphier.h> +#include <asm/outercache.h> + +/* control registers */ +#define UNIPHIER_SSCC 0x0 /* Control Register */ +#define UNIPHIER_SSCC_BST BIT(20) /* UCWG burst read */ +#define UNIPHIER_SSCC_ACT BIT(19) /* Inst-Data separate */ +#define UNIPHIER_SSCC_WTG BIT(18) /* WT gathering on */ +#define UNIPHIER_SSCC_PRD BIT(17) /* enable pre-fetch */ +#define UNIPHIER_SSCC_ON BIT(0) /* enable cache */ +#define UNIPHIER_SSCLPDAWCR 0x30 /* Unified/Data Active Way Control */ +#define UNIPHIER_SSCLPIAWCR 0x34 /* Instruction Active Way Control */ + +/* revision registers */ +#define UNIPHIER_SSCID 0x0 /* ID Register */ + +/* operation registers */ +#define UNIPHIER_SSCOPE 0x244 /* Cache Operation Primitive Entry */ +#define UNIPHIER_SSCOPE_CM_INV 0x0 /* invalidate */ +#define UNIPHIER_SSCOPE_CM_CLEAN 0x1 /* clean */ +#define UNIPHIER_SSCOPE_CM_FLUSH 0x2 /* flush */ +#define UNIPHIER_SSCOPE_CM_SYNC 0x8 /* sync (drain bufs) */ +#define UNIPHIER_SSCOPE_CM_FLUSH_PREFETCH 0x9 /* flush p-fetch buf */ +#define UNIPHIER_SSCOQM 0x248 /* Cache Operation Queue Mode */ +#define UNIPHIER_SSCOQM_TID_MASK (0x3 << 21) +#define UNIPHIER_SSCOQM_TID_LRU_DATA (0x0 << 21) +#define UNIPHIER_SSCOQM_TID_LRU_INST (0x1 << 21) +#define UNIPHIER_SSCOQM_TID_WAY (0x2 << 21) +#define UNIPHIER_SSCOQM_S_MASK (0x3 << 17) +#define UNIPHIER_SSCOQM_S_RANGE (0x0 << 17) +#define UNIPHIER_SSCOQM_S_ALL (0x1 << 17) +#define UNIPHIER_SSCOQM_S_WAY (0x2 << 17) +#define UNIPHIER_SSCOQM_CE BIT(15) /* notify completion */ +#define UNIPHIER_SSCOQM_CM_INV 0x0 /* invalidate */ +#define UNIPHIER_SSCOQM_CM_CLEAN 0x1 /* clean */ +#define UNIPHIER_SSCOQM_CM_FLUSH 0x2 /* flush */ +#define UNIPHIER_SSCOQM_CM_PREFETCH 0x3 /* prefetch to cache */ +#define UNIPHIER_SSCOQM_CM_PREFETCH_BUF 0x4 /* prefetch to pf-buf */ +#define UNIPHIER_SSCOQM_CM_TOUCH 0x5 /* touch */ +#define UNIPHIER_SSCOQM_CM_TOUCH_ZERO 0x6 /* touch to zero */ +#define UNIPHIER_SSCOQM_CM_TOUCH_DIRTY 0x7 /* touch with dirty */ +#define UNIPHIER_SSCOQAD 0x24c /* Cache Operation Queue Address */ +#define UNIPHIER_SSCOQSZ 0x250 /* Cache Operation Queue Size */ +#define UNIPHIER_SSCOQMASK 0x254 /* Cache Operation Queue Address Mask */ +#define UNIPHIER_SSCOQWN 0x258 /* Cache Operation Queue Way Number */ +#define UNIPHIER_SSCOPPQSEF 0x25c /* Cache Operation Queue Set Complete*/ +#define UNIPHIER_SSCOPPQSEF_FE BIT(1) +#define UNIPHIER_SSCOPPQSEF_OE BIT(0) +#define UNIPHIER_SSCOLPQS 0x260 /* Cache Operation Queue Status */ +#define UNIPHIER_SSCOLPQS_EF BIT(2) +#define UNIPHIER_SSCOLPQS_EST BIT(1) +#define UNIPHIER_SSCOLPQS_QST BIT(0) + +/* Is the touch/pre-fetch destination specified by ways? */ +#define UNIPHIER_SSCOQM_TID_IS_WAY(op) \ + ((op & UNIPHIER_SSCOQM_TID_MASK) == UNIPHIER_SSCOQM_TID_WAY) +/* Is the operation region specified by address range? */ +#define UNIPHIER_SSCOQM_S_IS_RANGE(op) \ + ((op & UNIPHIER_SSCOQM_S_MASK) == UNIPHIER_SSCOQM_S_RANGE) + +/** + * uniphier_cache_data - UniPhier outer cache specific data + * + * @ctrl_base: virtual base address of control registers + * @rev_base: virtual base address of revision registers + * @op_base: virtual base address of operation registers + * @way_present_mask: each bit specifies if the way is present + * @way_locked_mask: each bit specifies if the way is locked + * @nsets: number of associativity sets + * @line_size: line size in bytes + * @range_op_max_size: max size that can be handled by a single range operation + * @list: list node to include this level in the whole cache hierarchy + */ +struct uniphier_cache_data { + void __iomem *ctrl_base; + void __iomem *rev_base; + void __iomem *op_base; + u32 way_present_mask; + u32 way_locked_mask; + u32 nsets; + u32 line_size; + u32 range_op_max_size; + struct list_head list; +}; + +/* + * List of the whole outer cache hierarchy. This list is only modified during + * the early boot stage, so no mutex is taken for the access to the list. + */ +static LIST_HEAD(uniphier_cache_list); + +/** + * __uniphier_cache_sync - perform a sync point for a particular cache level + * + * @data: cache controller specific data + */ +static void __uniphier_cache_sync(struct uniphier_cache_data *data) +{ + /* This sequence need not be atomic. Do not disable IRQ. */ + writel_relaxed(UNIPHIER_SSCOPE_CM_SYNC, + data->op_base + UNIPHIER_SSCOPE); + /* need a read back to confirm */ + readl_relaxed(data->op_base + UNIPHIER_SSCOPE); +} + +/** + * __uniphier_cache_maint_common - run a queue operation for a particular level + * + * @data: cache controller specific data + * @start: start address of range operation (don't care for "all" operation) + * @size: data size of range operation (don't care for "all" operation) + * @operation: flags to specify the desired cache operation + */ +static void __uniphier_cache_maint_common(struct uniphier_cache_data *data, + unsigned long start, + unsigned long size, + u32 operation) +{ + unsigned long flags; + + /* + * No spin lock is necessary here because: + * + * [1] This outer cache controller is able to accept maintenance + * operations from multiple CPUs at a time in an SMP system; if a + * maintenance operation is under way and another operation is issued, + * the new one is stored in the queue. The controller performs one + * operation after another. If the queue is full, the status register, + * UNIPHIER_SSCOPPQSEF, indicates that the queue registration has + * failed. The status registers, UNIPHIER_{SSCOPPQSEF, SSCOLPQS}, have + * different instances for each CPU, i.e. each CPU can track the status + * of the maintenance operations triggered by itself. + * + * [2] The cache command registers, UNIPHIER_{SSCOQM, SSCOQAD, SSCOQSZ, + * SSCOQWN}, are shared between multiple CPUs, but the hardware still + * guarantees the registration sequence is atomic; the write access to + * them are arbitrated by the hardware. The first accessor to the + * register, UNIPHIER_SSCOQM, holds the access right and it is released + * by reading the status register, UNIPHIER_SSCOPPQSEF. While one CPU + * is holding the access right, other CPUs fail to register operations. + * One CPU should not hold the access right for a long time, so local + * IRQs should be disabled while the following sequence. + */ + local_irq_save(flags); + + /* clear the complete notification flag */ + writel_relaxed(UNIPHIER_SSCOLPQS_EF, data->op_base + UNIPHIER_SSCOLPQS); + + do { + /* set cache operation */ + writel_relaxed(UNIPHIER_SSCOQM_CE | operation, + data->op_base + UNIPHIER_SSCOQM); + + /* set address range if needed */ + if (likely(UNIPHIER_SSCOQM_S_IS_RANGE(operation))) { + writel_relaxed(start, data->op_base + UNIPHIER_SSCOQAD); + writel_relaxed(size, data->op_base + UNIPHIER_SSCOQSZ); + } + + /* set target ways if needed */ + if (unlikely(UNIPHIER_SSCOQM_TID_IS_WAY(operation))) + writel_relaxed(data->way_locked_mask, + data->op_base + UNIPHIER_SSCOQWN); + } while (unlikely(readl_relaxed(data->op_base + UNIPHIER_SSCOPPQSEF) & + (UNIPHIER_SSCOPPQSEF_FE | UNIPHIER_SSCOPPQSEF_OE))); + + /* wait until the operation is completed */ + while (likely(readl_relaxed(data->op_base + UNIPHIER_SSCOLPQS) != + UNIPHIER_SSCOLPQS_EF)) + cpu_relax(); + + local_irq_restore(flags); +} + +static void __uniphier_cache_maint_all(struct uniphier_cache_data *data, + u32 operation) +{ + __uniphier_cache_maint_common(data, 0, 0, + UNIPHIER_SSCOQM_S_ALL | operation); + + __uniphier_cache_sync(data); +} + +static void __uniphier_cache_maint_range(struct uniphier_cache_data *data, + unsigned long start, unsigned long end, + u32 operation) +{ + unsigned long size; + + /* + * If the start address is not aligned, + * perform a cache operation for the first cache-line + */ + start = start & ~(data->line_size - 1); + + size = end - start; + + if (unlikely(size >= (unsigned long)(-data->line_size))) { + /* this means cache operation for all range */ + __uniphier_cache_maint_all(data, operation); + return; + } + + /* + * If the end address is not aligned, + * perform a cache operation for the last cache-line + */ + size = ALIGN(size, data->line_size); + + while (size) { + unsigned long chunk_size = min_t(unsigned long, size, + data->range_op_max_size); + + __uniphier_cache_maint_common(data, start, chunk_size, + UNIPHIER_SSCOQM_S_RANGE | operation); + + start += chunk_size; + size -= chunk_size; + } + + __uniphier_cache_sync(data); +} + +static void __uniphier_cache_enable(struct uniphier_cache_data *data, bool on) +{ + u32 val = 0; + + if (on) + val = UNIPHIER_SSCC_WTG | UNIPHIER_SSCC_PRD | UNIPHIER_SSCC_ON; + + writel_relaxed(val, data->ctrl_base + UNIPHIER_SSCC); +} + +static void __init __uniphier_cache_set_locked_ways( + struct uniphier_cache_data *data, + u32 way_mask) +{ + data->way_locked_mask = way_mask & data->way_present_mask; + + writel_relaxed(~data->way_locked_mask & data->way_present_mask, + data->ctrl_base + UNIPHIER_SSCLPDAWCR); +} + +static void uniphier_cache_maint_range(unsigned long start, unsigned long end, + u32 operation) +{ + struct uniphier_cache_data *data; + + list_for_each_entry(data, &uniphier_cache_list, list) + __uniphier_cache_maint_range(data, start, end, operation); +} + +static void uniphier_cache_maint_all(u32 operation) +{ + struct uniphier_cache_data *data; + + list_for_each_entry(data, &uniphier_cache_list, list) + __uniphier_cache_maint_all(data, operation); +} + +static void uniphier_cache_inv_range(unsigned long start, unsigned long end) +{ + uniphier_cache_maint_range(start, end, UNIPHIER_SSCOQM_CM_INV); +} + +static void uniphier_cache_clean_range(unsigned long start, unsigned long end) +{ + uniphier_cache_maint_range(start, end, UNIPHIER_SSCOQM_CM_CLEAN); +} + +static void uniphier_cache_flush_range(unsigned long start, unsigned long end) +{ + uniphier_cache_maint_range(start, end, UNIPHIER_SSCOQM_CM_FLUSH); +} + +static void __init uniphier_cache_inv_all(void) +{ + uniphier_cache_maint_all(UNIPHIER_SSCOQM_CM_INV); +} + +static void uniphier_cache_flush_all(void) +{ + uniphier_cache_maint_all(UNIPHIER_SSCOQM_CM_FLUSH); +} + +static void uniphier_cache_disable(void) +{ + struct uniphier_cache_data *data; + + list_for_each_entry_reverse(data, &uniphier_cache_list, list) + __uniphier_cache_enable(data, false); + + uniphier_cache_flush_all(); +} + +static void __init uniphier_cache_enable(void) +{ + struct uniphier_cache_data *data; + + uniphier_cache_inv_all(); + + list_for_each_entry(data, &uniphier_cache_list, list) { + __uniphier_cache_enable(data, true); + __uniphier_cache_set_locked_ways(data, 0); + } +} + +static void uniphier_cache_sync(void) +{ + struct uniphier_cache_data *data; + + list_for_each_entry(data, &uniphier_cache_list, list) + __uniphier_cache_sync(data); +} + +int __init uniphier_cache_l2_is_enabled(void) +{ + struct uniphier_cache_data *data; + + data = list_first_entry_or_null(&uniphier_cache_list, + struct uniphier_cache_data, list); + if (!data) + return 0; + + return !!(readl_relaxed(data->ctrl_base + UNIPHIER_SSCC) & + UNIPHIER_SSCC_ON); +} + +void __init uniphier_cache_l2_touch_range(unsigned long start, + unsigned long end) +{ + struct uniphier_cache_data *data; + + data = list_first_entry_or_null(&uniphier_cache_list, + struct uniphier_cache_data, list); + if (data) + __uniphier_cache_maint_range(data, start, end, + UNIPHIER_SSCOQM_TID_WAY | + UNIPHIER_SSCOQM_CM_TOUCH); +} + +void __init uniphier_cache_l2_set_locked_ways(u32 way_mask) +{ + struct uniphier_cache_data *data; + + data = list_first_entry_or_null(&uniphier_cache_list, + struct uniphier_cache_data, list); + if (data) + __uniphier_cache_set_locked_ways(data, way_mask); +} + +static const struct of_device_id uniphier_cache_match[] __initconst = { + { + .compatible = "socionext,uniphier-system-cache", + }, + { /* sentinel */ } +}; + +static struct device_node * __init uniphier_cache_get_next_level_node( + struct device_node *np) +{ + u32 phandle; + + if (of_property_read_u32(np, "next-level-cache", &phandle)) + return NULL; + + return of_find_node_by_phandle(phandle); +} + +static int __init __uniphier_cache_init(struct device_node *np, + unsigned int *cache_level) +{ + struct uniphier_cache_data *data; + u32 level, cache_size; + struct device_node *next_np; + int ret = 0; + + if (!of_match_node(uniphier_cache_match, np)) { + pr_err("L%d: not compatible with uniphier cache\n", + *cache_level); + return -EINVAL; + } + + if (of_property_read_u32(np, "cache-level", &level)) { + pr_err("L%d: cache-level is not specified\n", *cache_level); + return -EINVAL; + } + + if (level != *cache_level) { + pr_err("L%d: cache-level is unexpected value %d\n", + *cache_level, level); + return -EINVAL; + } + + if (!of_property_read_bool(np, "cache-unified")) { + pr_err("L%d: cache-unified is not specified\n", *cache_level); + return -EINVAL; + } + + data = kzalloc(sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + if (of_property_read_u32(np, "cache-line-size", &data->line_size) || + !is_power_of_2(data->line_size)) { + pr_err("L%d: cache-line-size is unspecified or invalid\n", + *cache_level); + ret = -EINVAL; + goto err; + } + + if (of_property_read_u32(np, "cache-sets", &data->nsets) || + !is_power_of_2(data->nsets)) { + pr_err("L%d: cache-sets is unspecified or invalid\n", + *cache_level); + ret = -EINVAL; + goto err; + } + + if (of_property_read_u32(np, "cache-size", &cache_size) || + cache_size == 0 || cache_size % (data->nsets * data->line_size)) { + pr_err("L%d: cache-size is unspecified or invalid\n", + *cache_level); + ret = -EINVAL; + goto err; + } + + data->way_present_mask = + ((u32)1 << cache_size / data->nsets / data->line_size) - 1; + + data->ctrl_base = of_iomap(np, 0); + if (!data->ctrl_base) { + pr_err("L%d: failed to map control register\n", *cache_level); + ret = -ENOMEM; + goto err; + } + + data->rev_base = of_iomap(np, 1); + if (!data->rev_base) { + pr_err("L%d: failed to map revision register\n", *cache_level); + ret = -ENOMEM; + goto err; + } + + data->op_base = of_iomap(np, 2); + if (!data->op_base) { + pr_err("L%d: failed to map operation register\n", *cache_level); + ret = -ENOMEM; + goto err; + } + + if (*cache_level == 2) { + u32 revision = readl(data->rev_base + UNIPHIER_SSCID); + /* + * The size of range operation is limited to (1 << 22) or less + * for PH-sLD8 or older SoCs. + */ + if (revision <= 0x16) + data->range_op_max_size = (u32)1 << 22; + } + + data->range_op_max_size -= data->line_size; + + INIT_LIST_HEAD(&data->list); + list_add_tail(&data->list, &uniphier_cache_list); /* no mutex */ + + /* + * OK, this level has been successfully initialized. Look for the next + * level cache. Do not roll back even if the initialization of the + * next level cache fails because we want to continue with available + * cache levels. + */ + next_np = uniphier_cache_get_next_level_node(np); + if (next_np) { + (*cache_level)++; + ret = __uniphier_cache_init(next_np, cache_level); + } + of_node_put(next_np); + + return ret; +err: + iounmap(data->op_base); + iounmap(data->rev_base); + iounmap(data->ctrl_base); + kfree(data); + + return ret; +} + +int __init uniphier_cache_init(void) +{ + struct device_node *np = NULL; + unsigned int cache_level; + int ret = 0; + + /* look for level 2 cache */ + while ((np = of_find_matching_node(np, uniphier_cache_match))) + if (!of_property_read_u32(np, "cache-level", &cache_level) && + cache_level == 2) + break; + + if (!np) + return -ENODEV; + + ret = __uniphier_cache_init(np, &cache_level); + of_node_put(np); + + if (ret) { + /* + * Error out iif L2 initialization fails. Continue with any + * error on L3 or outer because they are optional. + */ + if (cache_level == 2) { + pr_err("failed to initialize L2 cache\n"); + return ret; + } + + cache_level--; + ret = 0; + } + + outer_cache.inv_range = uniphier_cache_inv_range; + outer_cache.clean_range = uniphier_cache_clean_range; + outer_cache.flush_range = uniphier_cache_flush_range; + outer_cache.flush_all = uniphier_cache_flush_all; + outer_cache.disable = uniphier_cache_disable; + outer_cache.sync = uniphier_cache_sync; + + uniphier_cache_enable(); + + pr_info("enabled outer cache (cache level: %d)\n", cache_level); + + return ret; +} |