1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Copyright (C) 2015-2016 Socionext Inc.
4 * Author: Masahiro Yamada <yamada.masahiro@socionext.com>
7 #define pr_fmt(fmt) "uniphier: " fmt
9 #include <linux/bitops.h>
10 #include <linux/init.h>
12 #include <linux/log2.h>
13 #include <linux/of_address.h>
14 #include <linux/slab.h>
15 #include <asm/hardware/cache-uniphier.h>
16 #include <asm/outercache.h>
18 /* control registers */
19 #define UNIPHIER_SSCC 0x0 /* Control Register */
20 #define UNIPHIER_SSCC_BST BIT(20) /* UCWG burst read */
21 #define UNIPHIER_SSCC_ACT BIT(19) /* Inst-Data separate */
22 #define UNIPHIER_SSCC_WTG BIT(18) /* WT gathering on */
23 #define UNIPHIER_SSCC_PRD BIT(17) /* enable pre-fetch */
24 #define UNIPHIER_SSCC_ON BIT(0) /* enable cache */
25 #define UNIPHIER_SSCLPDAWCR 0x30 /* Unified/Data Active Way Control */
26 #define UNIPHIER_SSCLPIAWCR 0x34 /* Instruction Active Way Control */
28 /* revision registers */
29 #define UNIPHIER_SSCID 0x0 /* ID Register */
31 /* operation registers */
32 #define UNIPHIER_SSCOPE 0x244 /* Cache Operation Primitive Entry */
33 #define UNIPHIER_SSCOPE_CM_INV 0x0 /* invalidate */
34 #define UNIPHIER_SSCOPE_CM_CLEAN 0x1 /* clean */
35 #define UNIPHIER_SSCOPE_CM_FLUSH 0x2 /* flush */
36 #define UNIPHIER_SSCOPE_CM_SYNC 0x8 /* sync (drain bufs) */
37 #define UNIPHIER_SSCOPE_CM_FLUSH_PREFETCH 0x9 /* flush p-fetch buf */
38 #define UNIPHIER_SSCOQM 0x248 /* Cache Operation Queue Mode */
39 #define UNIPHIER_SSCOQM_S_MASK (0x3 << 17)
40 #define UNIPHIER_SSCOQM_S_RANGE (0x0 << 17)
41 #define UNIPHIER_SSCOQM_S_ALL (0x1 << 17)
42 #define UNIPHIER_SSCOQM_CE BIT(15) /* notify completion */
43 #define UNIPHIER_SSCOQM_CM_INV 0x0 /* invalidate */
44 #define UNIPHIER_SSCOQM_CM_CLEAN 0x1 /* clean */
45 #define UNIPHIER_SSCOQM_CM_FLUSH 0x2 /* flush */
46 #define UNIPHIER_SSCOQAD 0x24c /* Cache Operation Queue Address */
47 #define UNIPHIER_SSCOQSZ 0x250 /* Cache Operation Queue Size */
48 #define UNIPHIER_SSCOPPQSEF 0x25c /* Cache Operation Queue Set Complete*/
49 #define UNIPHIER_SSCOPPQSEF_FE BIT(1)
50 #define UNIPHIER_SSCOPPQSEF_OE BIT(0)
51 #define UNIPHIER_SSCOLPQS 0x260 /* Cache Operation Queue Status */
52 #define UNIPHIER_SSCOLPQS_EF BIT(2)
53 #define UNIPHIER_SSCOLPQS_EST BIT(1)
54 #define UNIPHIER_SSCOLPQS_QST BIT(0)
56 /* Is the operation region specified by address range? */
57 #define UNIPHIER_SSCOQM_S_IS_RANGE(op) \
58 ((op & UNIPHIER_SSCOQM_S_MASK) == UNIPHIER_SSCOQM_S_RANGE)
61 * uniphier_cache_data - UniPhier outer cache specific data
63 * @ctrl_base: virtual base address of control registers
64 * @rev_base: virtual base address of revision registers
65 * @op_base: virtual base address of operation registers
66 * @way_mask: each bit specifies if the way is present
67 * @nsets: number of associativity sets
68 * @line_size: line size in bytes
69 * @range_op_max_size: max size that can be handled by a single range operation
70 * @list: list node to include this level in the whole cache hierarchy
72 struct uniphier_cache_data {
73 void __iomem *ctrl_base;
74 void __iomem *rev_base;
75 void __iomem *op_base;
76 void __iomem *way_ctrl_base;
80 u32 range_op_max_size;
81 struct list_head list;
85 * List of the whole outer cache hierarchy. This list is only modified during
86 * the early boot stage, so no mutex is taken for the access to the list.
88 static LIST_HEAD(uniphier_cache_list);
91 * __uniphier_cache_sync - perform a sync point for a particular cache level
93 * @data: cache controller specific data
95 static void __uniphier_cache_sync(struct uniphier_cache_data *data)
97 /* This sequence need not be atomic. Do not disable IRQ. */
98 writel_relaxed(UNIPHIER_SSCOPE_CM_SYNC,
99 data->op_base + UNIPHIER_SSCOPE);
100 /* need a read back to confirm */
101 readl_relaxed(data->op_base + UNIPHIER_SSCOPE);
105 * __uniphier_cache_maint_common - run a queue operation for a particular level
107 * @data: cache controller specific data
108 * @start: start address of range operation (don't care for "all" operation)
109 * @size: data size of range operation (don't care for "all" operation)
110 * @operation: flags to specify the desired cache operation
112 static void __uniphier_cache_maint_common(struct uniphier_cache_data *data,
120 * No spin lock is necessary here because:
122 * [1] This outer cache controller is able to accept maintenance
123 * operations from multiple CPUs at a time in an SMP system; if a
124 * maintenance operation is under way and another operation is issued,
125 * the new one is stored in the queue. The controller performs one
126 * operation after another. If the queue is full, the status register,
127 * UNIPHIER_SSCOPPQSEF, indicates that the queue registration has
128 * failed. The status registers, UNIPHIER_{SSCOPPQSEF, SSCOLPQS}, have
129 * different instances for each CPU, i.e. each CPU can track the status
130 * of the maintenance operations triggered by itself.
132 * [2] The cache command registers, UNIPHIER_{SSCOQM, SSCOQAD, SSCOQSZ,
133 * SSCOQWN}, are shared between multiple CPUs, but the hardware still
134 * guarantees the registration sequence is atomic; the write access to
135 * them are arbitrated by the hardware. The first accessor to the
136 * register, UNIPHIER_SSCOQM, holds the access right and it is released
137 * by reading the status register, UNIPHIER_SSCOPPQSEF. While one CPU
138 * is holding the access right, other CPUs fail to register operations.
139 * One CPU should not hold the access right for a long time, so local
140 * IRQs should be disabled while the following sequence.
142 local_irq_save(flags);
144 /* clear the complete notification flag */
145 writel_relaxed(UNIPHIER_SSCOLPQS_EF, data->op_base + UNIPHIER_SSCOLPQS);
148 /* set cache operation */
149 writel_relaxed(UNIPHIER_SSCOQM_CE | operation,
150 data->op_base + UNIPHIER_SSCOQM);
152 /* set address range if needed */
153 if (likely(UNIPHIER_SSCOQM_S_IS_RANGE(operation))) {
154 writel_relaxed(start, data->op_base + UNIPHIER_SSCOQAD);
155 writel_relaxed(size, data->op_base + UNIPHIER_SSCOQSZ);
157 } while (unlikely(readl_relaxed(data->op_base + UNIPHIER_SSCOPPQSEF) &
158 (UNIPHIER_SSCOPPQSEF_FE | UNIPHIER_SSCOPPQSEF_OE)));
160 /* wait until the operation is completed */
161 while (likely(readl_relaxed(data->op_base + UNIPHIER_SSCOLPQS) !=
162 UNIPHIER_SSCOLPQS_EF))
165 local_irq_restore(flags);
168 static void __uniphier_cache_maint_all(struct uniphier_cache_data *data,
171 __uniphier_cache_maint_common(data, 0, 0,
172 UNIPHIER_SSCOQM_S_ALL | operation);
174 __uniphier_cache_sync(data);
177 static void __uniphier_cache_maint_range(struct uniphier_cache_data *data,
178 unsigned long start, unsigned long end,
184 * If the start address is not aligned,
185 * perform a cache operation for the first cache-line
187 start = start & ~(data->line_size - 1);
191 if (unlikely(size >= (unsigned long)(-data->line_size))) {
192 /* this means cache operation for all range */
193 __uniphier_cache_maint_all(data, operation);
198 * If the end address is not aligned,
199 * perform a cache operation for the last cache-line
201 size = ALIGN(size, data->line_size);
204 unsigned long chunk_size = min_t(unsigned long, size,
205 data->range_op_max_size);
207 __uniphier_cache_maint_common(data, start, chunk_size,
208 UNIPHIER_SSCOQM_S_RANGE | operation);
214 __uniphier_cache_sync(data);
217 static void __uniphier_cache_enable(struct uniphier_cache_data *data, bool on)
222 val = UNIPHIER_SSCC_WTG | UNIPHIER_SSCC_PRD | UNIPHIER_SSCC_ON;
224 writel_relaxed(val, data->ctrl_base + UNIPHIER_SSCC);
227 static void __init __uniphier_cache_set_active_ways(
228 struct uniphier_cache_data *data)
232 for_each_possible_cpu(cpu)
233 writel_relaxed(data->way_mask, data->way_ctrl_base + 4 * cpu);
236 static void uniphier_cache_maint_range(unsigned long start, unsigned long end,
239 struct uniphier_cache_data *data;
241 list_for_each_entry(data, &uniphier_cache_list, list)
242 __uniphier_cache_maint_range(data, start, end, operation);
245 static void uniphier_cache_maint_all(u32 operation)
247 struct uniphier_cache_data *data;
249 list_for_each_entry(data, &uniphier_cache_list, list)
250 __uniphier_cache_maint_all(data, operation);
253 static void uniphier_cache_inv_range(unsigned long start, unsigned long end)
255 uniphier_cache_maint_range(start, end, UNIPHIER_SSCOQM_CM_INV);
258 static void uniphier_cache_clean_range(unsigned long start, unsigned long end)
260 uniphier_cache_maint_range(start, end, UNIPHIER_SSCOQM_CM_CLEAN);
263 static void uniphier_cache_flush_range(unsigned long start, unsigned long end)
265 uniphier_cache_maint_range(start, end, UNIPHIER_SSCOQM_CM_FLUSH);
268 static void __init uniphier_cache_inv_all(void)
270 uniphier_cache_maint_all(UNIPHIER_SSCOQM_CM_INV);
273 static void uniphier_cache_flush_all(void)
275 uniphier_cache_maint_all(UNIPHIER_SSCOQM_CM_FLUSH);
278 static void uniphier_cache_disable(void)
280 struct uniphier_cache_data *data;
282 list_for_each_entry_reverse(data, &uniphier_cache_list, list)
283 __uniphier_cache_enable(data, false);
285 uniphier_cache_flush_all();
288 static void __init uniphier_cache_enable(void)
290 struct uniphier_cache_data *data;
292 uniphier_cache_inv_all();
294 list_for_each_entry(data, &uniphier_cache_list, list) {
295 __uniphier_cache_enable(data, true);
296 __uniphier_cache_set_active_ways(data);
300 static void uniphier_cache_sync(void)
302 struct uniphier_cache_data *data;
304 list_for_each_entry(data, &uniphier_cache_list, list)
305 __uniphier_cache_sync(data);
308 static const struct of_device_id uniphier_cache_match[] __initconst = {
309 { .compatible = "socionext,uniphier-system-cache" },
313 static int __init __uniphier_cache_init(struct device_node *np,
314 unsigned int *cache_level)
316 struct uniphier_cache_data *data;
317 u32 level, cache_size;
318 struct device_node *next_np;
321 if (!of_match_node(uniphier_cache_match, np)) {
322 pr_err("L%d: not compatible with uniphier cache\n",
327 if (of_property_read_u32(np, "cache-level", &level)) {
328 pr_err("L%d: cache-level is not specified\n", *cache_level);
332 if (level != *cache_level) {
333 pr_err("L%d: cache-level is unexpected value %d\n",
334 *cache_level, level);
338 if (!of_property_read_bool(np, "cache-unified")) {
339 pr_err("L%d: cache-unified is not specified\n", *cache_level);
343 data = kzalloc(sizeof(*data), GFP_KERNEL);
347 if (of_property_read_u32(np, "cache-line-size", &data->line_size) ||
348 !is_power_of_2(data->line_size)) {
349 pr_err("L%d: cache-line-size is unspecified or invalid\n",
355 if (of_property_read_u32(np, "cache-sets", &data->nsets) ||
356 !is_power_of_2(data->nsets)) {
357 pr_err("L%d: cache-sets is unspecified or invalid\n",
363 if (of_property_read_u32(np, "cache-size", &cache_size) ||
364 cache_size == 0 || cache_size % (data->nsets * data->line_size)) {
365 pr_err("L%d: cache-size is unspecified or invalid\n",
371 data->way_mask = GENMASK(cache_size / data->nsets / data->line_size - 1,
374 data->ctrl_base = of_iomap(np, 0);
375 if (!data->ctrl_base) {
376 pr_err("L%d: failed to map control register\n", *cache_level);
381 data->rev_base = of_iomap(np, 1);
382 if (!data->rev_base) {
383 pr_err("L%d: failed to map revision register\n", *cache_level);
388 data->op_base = of_iomap(np, 2);
389 if (!data->op_base) {
390 pr_err("L%d: failed to map operation register\n", *cache_level);
395 data->way_ctrl_base = data->ctrl_base + 0xc00;
397 if (*cache_level == 2) {
398 u32 revision = readl(data->rev_base + UNIPHIER_SSCID);
400 * The size of range operation is limited to (1 << 22) or less
401 * for PH-sLD8 or older SoCs.
403 if (revision <= 0x16)
404 data->range_op_max_size = (u32)1 << 22;
407 * Unfortunatly, the offset address of active way control base
408 * varies from SoC to SoC.
411 case 0x11: /* sLD3 */
412 data->way_ctrl_base = data->ctrl_base + 0x870;
415 case 0x16: /* sld8 */
416 data->way_ctrl_base = data->ctrl_base + 0x840;
423 data->range_op_max_size -= data->line_size;
425 INIT_LIST_HEAD(&data->list);
426 list_add_tail(&data->list, &uniphier_cache_list); /* no mutex */
429 * OK, this level has been successfully initialized. Look for the next
430 * level cache. Do not roll back even if the initialization of the
431 * next level cache fails because we want to continue with available
434 next_np = of_find_next_cache_node(np);
437 ret = __uniphier_cache_init(next_np, cache_level);
439 of_node_put(next_np);
443 iounmap(data->op_base);
444 iounmap(data->rev_base);
445 iounmap(data->ctrl_base);
451 int __init uniphier_cache_init(void)
453 struct device_node *np = NULL;
454 unsigned int cache_level;
457 /* look for level 2 cache */
458 while ((np = of_find_matching_node(np, uniphier_cache_match)))
459 if (!of_property_read_u32(np, "cache-level", &cache_level) &&
466 ret = __uniphier_cache_init(np, &cache_level);
471 * Error out iif L2 initialization fails. Continue with any
472 * error on L3 or outer because they are optional.
474 if (cache_level == 2) {
475 pr_err("failed to initialize L2 cache\n");
483 outer_cache.inv_range = uniphier_cache_inv_range;
484 outer_cache.clean_range = uniphier_cache_clean_range;
485 outer_cache.flush_range = uniphier_cache_flush_range;
486 outer_cache.flush_all = uniphier_cache_flush_all;
487 outer_cache.disable = uniphier_cache_disable;
488 outer_cache.sync = uniphier_cache_sync;
490 uniphier_cache_enable();
492 pr_info("enabled outer cache (cache level: %d)\n", cache_level);