2 * arch/arm/mm/cache-l2x0.c - L210/L220 cache controller support
4 * Copyright (C) 2007 ARM Limited
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 #include <linux/err.h>
20 #include <linux/init.h>
21 #include <linux/spinlock.h>
24 #include <linux/of_address.h>
26 #include <asm/cacheflush.h>
27 #include <asm/hardware/cache-l2x0.h>
29 #define CACHE_LINE_SIZE 32
31 static void __iomem *l2x0_base;
32 static DEFINE_RAW_SPINLOCK(l2x0_lock);
33 static u32 l2x0_way_mask; /* Bitmask of active ways */
35 static unsigned long sync_reg_offset = L2X0_CACHE_SYNC;
37 struct l2x0_regs l2x0_saved_regs;
40 void (*setup)(const struct device_node *, u32 *, u32 *);
45 static inline void cache_wait_way(void __iomem *reg, unsigned long mask)
47 /* wait for cache operation by line or way to complete */
48 while (readl_relaxed(reg) & mask)
52 #ifdef CONFIG_CACHE_PL310
53 static inline void cache_wait(void __iomem *reg, unsigned long mask)
55 /* cache operations by line are atomic on PL310 */
58 #define cache_wait cache_wait_way
61 static inline void cache_sync(void)
63 void __iomem *base = l2x0_base;
65 writel_relaxed(0, base + sync_reg_offset);
66 cache_wait(base + L2X0_CACHE_SYNC, 1);
69 static inline void l2x0_clean_line(unsigned long addr)
71 void __iomem *base = l2x0_base;
72 cache_wait(base + L2X0_CLEAN_LINE_PA, 1);
73 writel_relaxed(addr, base + L2X0_CLEAN_LINE_PA);
76 static inline void l2x0_inv_line(unsigned long addr)
78 void __iomem *base = l2x0_base;
79 cache_wait(base + L2X0_INV_LINE_PA, 1);
80 writel_relaxed(addr, base + L2X0_INV_LINE_PA);
83 #if defined(CONFIG_PL310_ERRATA_588369) || defined(CONFIG_PL310_ERRATA_727915)
84 static inline void debug_writel(unsigned long val)
86 if (outer_cache.set_debug)
87 outer_cache.set_debug(val);
90 static void pl310_set_debug(unsigned long val)
92 writel_relaxed(val, l2x0_base + L2X0_DEBUG_CTRL);
95 /* Optimised out for non-errata case */
96 static inline void debug_writel(unsigned long val)
100 #define pl310_set_debug NULL
103 #ifdef CONFIG_PL310_ERRATA_588369
104 static inline void l2x0_flush_line(unsigned long addr)
106 void __iomem *base = l2x0_base;
108 /* Clean by PA followed by Invalidate by PA */
109 cache_wait(base + L2X0_CLEAN_LINE_PA, 1);
110 writel_relaxed(addr, base + L2X0_CLEAN_LINE_PA);
111 cache_wait(base + L2X0_INV_LINE_PA, 1);
112 writel_relaxed(addr, base + L2X0_INV_LINE_PA);
116 static inline void l2x0_flush_line(unsigned long addr)
118 void __iomem *base = l2x0_base;
119 cache_wait(base + L2X0_CLEAN_INV_LINE_PA, 1);
120 writel_relaxed(addr, base + L2X0_CLEAN_INV_LINE_PA);
124 static void l2x0_cache_sync(void)
128 raw_spin_lock_irqsave(&l2x0_lock, flags);
130 raw_spin_unlock_irqrestore(&l2x0_lock, flags);
133 static void __l2x0_flush_all(void)
136 writel_relaxed(l2x0_way_mask, l2x0_base + L2X0_CLEAN_INV_WAY);
137 cache_wait_way(l2x0_base + L2X0_CLEAN_INV_WAY, l2x0_way_mask);
142 static void l2x0_flush_all(void)
147 raw_spin_lock_irqsave(&l2x0_lock, flags);
149 raw_spin_unlock_irqrestore(&l2x0_lock, flags);
152 static void l2x0_clean_all(void)
157 raw_spin_lock_irqsave(&l2x0_lock, flags);
158 writel_relaxed(l2x0_way_mask, l2x0_base + L2X0_CLEAN_WAY);
159 cache_wait_way(l2x0_base + L2X0_CLEAN_WAY, l2x0_way_mask);
161 raw_spin_unlock_irqrestore(&l2x0_lock, flags);
164 static void l2x0_inv_all(void)
168 /* invalidate all ways */
169 raw_spin_lock_irqsave(&l2x0_lock, flags);
170 /* Invalidating when L2 is enabled is a nono */
171 BUG_ON(readl(l2x0_base + L2X0_CTRL) & 1);
172 writel_relaxed(l2x0_way_mask, l2x0_base + L2X0_INV_WAY);
173 cache_wait_way(l2x0_base + L2X0_INV_WAY, l2x0_way_mask);
175 raw_spin_unlock_irqrestore(&l2x0_lock, flags);
178 static void l2x0_inv_range(unsigned long start, unsigned long end)
180 void __iomem *base = l2x0_base;
183 raw_spin_lock_irqsave(&l2x0_lock, flags);
184 if (start & (CACHE_LINE_SIZE - 1)) {
185 start &= ~(CACHE_LINE_SIZE - 1);
187 l2x0_flush_line(start);
189 start += CACHE_LINE_SIZE;
192 if (end & (CACHE_LINE_SIZE - 1)) {
193 end &= ~(CACHE_LINE_SIZE - 1);
195 l2x0_flush_line(end);
199 while (start < end) {
200 unsigned long blk_end = start + min(end - start, 4096UL);
202 while (start < blk_end) {
203 l2x0_inv_line(start);
204 start += CACHE_LINE_SIZE;
208 raw_spin_unlock_irqrestore(&l2x0_lock, flags);
209 raw_spin_lock_irqsave(&l2x0_lock, flags);
212 cache_wait(base + L2X0_INV_LINE_PA, 1);
214 raw_spin_unlock_irqrestore(&l2x0_lock, flags);
217 static void l2x0_clean_range(unsigned long start, unsigned long end)
219 void __iomem *base = l2x0_base;
222 if ((end - start) >= l2x0_size) {
227 raw_spin_lock_irqsave(&l2x0_lock, flags);
228 start &= ~(CACHE_LINE_SIZE - 1);
229 while (start < end) {
230 unsigned long blk_end = start + min(end - start, 4096UL);
232 while (start < blk_end) {
233 l2x0_clean_line(start);
234 start += CACHE_LINE_SIZE;
238 raw_spin_unlock_irqrestore(&l2x0_lock, flags);
239 raw_spin_lock_irqsave(&l2x0_lock, flags);
242 cache_wait(base + L2X0_CLEAN_LINE_PA, 1);
244 raw_spin_unlock_irqrestore(&l2x0_lock, flags);
247 static void l2x0_flush_range(unsigned long start, unsigned long end)
249 void __iomem *base = l2x0_base;
252 if ((end - start) >= l2x0_size) {
257 raw_spin_lock_irqsave(&l2x0_lock, flags);
258 start &= ~(CACHE_LINE_SIZE - 1);
259 while (start < end) {
260 unsigned long blk_end = start + min(end - start, 4096UL);
263 while (start < blk_end) {
264 l2x0_flush_line(start);
265 start += CACHE_LINE_SIZE;
270 raw_spin_unlock_irqrestore(&l2x0_lock, flags);
271 raw_spin_lock_irqsave(&l2x0_lock, flags);
274 cache_wait(base + L2X0_CLEAN_INV_LINE_PA, 1);
276 raw_spin_unlock_irqrestore(&l2x0_lock, flags);
279 static void l2x0_disable(void)
283 raw_spin_lock_irqsave(&l2x0_lock, flags);
285 writel_relaxed(0, l2x0_base + L2X0_CTRL);
287 raw_spin_unlock_irqrestore(&l2x0_lock, flags);
290 static void l2x0_unlock(u32 cache_id)
295 if (cache_id == L2X0_CACHE_ID_PART_L310)
298 /* L210 and unknown types */
301 for (i = 0; i < lockregs; i++) {
302 writel_relaxed(0x0, l2x0_base + L2X0_LOCKDOWN_WAY_D_BASE +
303 i * L2X0_LOCKDOWN_STRIDE);
304 writel_relaxed(0x0, l2x0_base + L2X0_LOCKDOWN_WAY_I_BASE +
305 i * L2X0_LOCKDOWN_STRIDE);
309 void __init l2x0_init(void __iomem *base, u32 aux_val, u32 aux_mask)
319 cache_id = readl_relaxed(l2x0_base + L2X0_CACHE_ID);
320 aux = readl_relaxed(l2x0_base + L2X0_AUX_CTRL);
325 /* Determine the number of ways */
326 switch (cache_id & L2X0_CACHE_ID_PART_MASK) {
327 case L2X0_CACHE_ID_PART_L310:
333 #ifdef CONFIG_PL310_ERRATA_753970
334 /* Unmapped register. */
335 sync_reg_offset = L2X0_DUMMY_REG;
337 outer_cache.set_debug = pl310_set_debug;
339 case L2X0_CACHE_ID_PART_L210:
340 ways = (aux >> 13) & 0xf;
344 /* Assume unknown chips have 8 ways */
346 type = "L2x0 series";
350 l2x0_way_mask = (1 << ways) - 1;
353 * L2 cache Size = Way size * Number of ways
355 way_size = (aux & L2X0_AUX_CTRL_WAY_SIZE_MASK) >> 17;
356 way_size = 1 << (way_size + 3);
357 l2x0_size = ways * way_size * SZ_1K;
360 * Check if l2x0 controller is already enabled.
361 * If you are booting from non-secure mode
362 * accessing the below registers will fault.
364 if (!(readl_relaxed(l2x0_base + L2X0_CTRL) & 1)) {
365 /* Make sure that I&D is not locked down when starting */
366 l2x0_unlock(cache_id);
368 /* l2x0 controller is disabled */
369 writel_relaxed(aux, l2x0_base + L2X0_AUX_CTRL);
371 l2x0_saved_regs.aux_ctrl = aux;
376 writel_relaxed(1, l2x0_base + L2X0_CTRL);
379 outer_cache.inv_range = l2x0_inv_range;
380 outer_cache.clean_range = l2x0_clean_range;
381 outer_cache.flush_range = l2x0_flush_range;
382 outer_cache.sync = l2x0_cache_sync;
383 outer_cache.flush_all = l2x0_flush_all;
384 outer_cache.inv_all = l2x0_inv_all;
385 outer_cache.disable = l2x0_disable;
387 printk(KERN_INFO "%s cache controller enabled\n", type);
388 printk(KERN_INFO "l2x0: %d ways, CACHE_ID 0x%08x, AUX_CTRL 0x%08x, Cache size: %d B\n",
389 ways, cache_id, aux, l2x0_size);
393 static void __init l2x0_of_setup(const struct device_node *np,
394 u32 *aux_val, u32 *aux_mask)
396 u32 data[2] = { 0, 0 };
399 u32 val = 0, mask = 0;
401 of_property_read_u32(np, "arm,tag-latency", &tag);
403 mask |= L2X0_AUX_CTRL_TAG_LATENCY_MASK;
404 val |= (tag - 1) << L2X0_AUX_CTRL_TAG_LATENCY_SHIFT;
407 of_property_read_u32_array(np, "arm,data-latency",
408 data, ARRAY_SIZE(data));
409 if (data[0] && data[1]) {
410 mask |= L2X0_AUX_CTRL_DATA_RD_LATENCY_MASK |
411 L2X0_AUX_CTRL_DATA_WR_LATENCY_MASK;
412 val |= ((data[0] - 1) << L2X0_AUX_CTRL_DATA_RD_LATENCY_SHIFT) |
413 ((data[1] - 1) << L2X0_AUX_CTRL_DATA_WR_LATENCY_SHIFT);
416 of_property_read_u32(np, "arm,dirty-latency", &dirty);
418 mask |= L2X0_AUX_CTRL_DIRTY_LATENCY_MASK;
419 val |= (dirty - 1) << L2X0_AUX_CTRL_DIRTY_LATENCY_SHIFT;
427 static void __init pl310_of_setup(const struct device_node *np,
428 u32 *aux_val, u32 *aux_mask)
430 u32 data[3] = { 0, 0, 0 };
431 u32 tag[3] = { 0, 0, 0 };
432 u32 filter[2] = { 0, 0 };
434 of_property_read_u32_array(np, "arm,tag-latency", tag, ARRAY_SIZE(tag));
435 if (tag[0] && tag[1] && tag[2])
437 ((tag[0] - 1) << L2X0_LATENCY_CTRL_RD_SHIFT) |
438 ((tag[1] - 1) << L2X0_LATENCY_CTRL_WR_SHIFT) |
439 ((tag[2] - 1) << L2X0_LATENCY_CTRL_SETUP_SHIFT),
440 l2x0_base + L2X0_TAG_LATENCY_CTRL);
442 of_property_read_u32_array(np, "arm,data-latency",
443 data, ARRAY_SIZE(data));
444 if (data[0] && data[1] && data[2])
446 ((data[0] - 1) << L2X0_LATENCY_CTRL_RD_SHIFT) |
447 ((data[1] - 1) << L2X0_LATENCY_CTRL_WR_SHIFT) |
448 ((data[2] - 1) << L2X0_LATENCY_CTRL_SETUP_SHIFT),
449 l2x0_base + L2X0_DATA_LATENCY_CTRL);
451 of_property_read_u32_array(np, "arm,filter-ranges",
452 filter, ARRAY_SIZE(filter));
454 writel_relaxed(ALIGN(filter[0] + filter[1], SZ_1M),
455 l2x0_base + L2X0_ADDR_FILTER_END);
456 writel_relaxed((filter[0] & ~(SZ_1M - 1)) | L2X0_ADDR_FILTER_EN,
457 l2x0_base + L2X0_ADDR_FILTER_START);
461 static void __init pl310_save(void)
463 u32 l2x0_revision = readl_relaxed(l2x0_base + L2X0_CACHE_ID) &
464 L2X0_CACHE_ID_RTL_MASK;
466 l2x0_saved_regs.tag_latency = readl_relaxed(l2x0_base +
467 L2X0_TAG_LATENCY_CTRL);
468 l2x0_saved_regs.data_latency = readl_relaxed(l2x0_base +
469 L2X0_DATA_LATENCY_CTRL);
470 l2x0_saved_regs.filter_end = readl_relaxed(l2x0_base +
471 L2X0_ADDR_FILTER_END);
472 l2x0_saved_regs.filter_start = readl_relaxed(l2x0_base +
473 L2X0_ADDR_FILTER_START);
475 if (l2x0_revision >= L2X0_CACHE_ID_RTL_R2P0) {
477 * From r2p0, there is Prefetch offset/control register
479 l2x0_saved_regs.prefetch_ctrl = readl_relaxed(l2x0_base +
482 * From r3p0, there is Power control register
484 if (l2x0_revision >= L2X0_CACHE_ID_RTL_R3P0)
485 l2x0_saved_regs.pwr_ctrl = readl_relaxed(l2x0_base +
490 static void l2x0_resume(void)
492 if (!(readl_relaxed(l2x0_base + L2X0_CTRL) & 1)) {
493 /* restore aux ctrl and enable l2 */
494 l2x0_unlock(readl_relaxed(l2x0_base + L2X0_CACHE_ID));
496 writel_relaxed(l2x0_saved_regs.aux_ctrl, l2x0_base +
501 writel_relaxed(1, l2x0_base + L2X0_CTRL);
505 static void pl310_resume(void)
509 if (!(readl_relaxed(l2x0_base + L2X0_CTRL) & 1)) {
510 /* restore pl310 setup */
511 writel_relaxed(l2x0_saved_regs.tag_latency,
512 l2x0_base + L2X0_TAG_LATENCY_CTRL);
513 writel_relaxed(l2x0_saved_regs.data_latency,
514 l2x0_base + L2X0_DATA_LATENCY_CTRL);
515 writel_relaxed(l2x0_saved_regs.filter_end,
516 l2x0_base + L2X0_ADDR_FILTER_END);
517 writel_relaxed(l2x0_saved_regs.filter_start,
518 l2x0_base + L2X0_ADDR_FILTER_START);
520 l2x0_revision = readl_relaxed(l2x0_base + L2X0_CACHE_ID) &
521 L2X0_CACHE_ID_RTL_MASK;
523 if (l2x0_revision >= L2X0_CACHE_ID_RTL_R2P0) {
524 writel_relaxed(l2x0_saved_regs.prefetch_ctrl,
525 l2x0_base + L2X0_PREFETCH_CTRL);
526 if (l2x0_revision >= L2X0_CACHE_ID_RTL_R3P0)
527 writel_relaxed(l2x0_saved_regs.pwr_ctrl,
528 l2x0_base + L2X0_POWER_CTRL);
535 static const struct l2x0_of_data pl310_data = {
541 static const struct l2x0_of_data l2x0_data = {
547 static const struct of_device_id l2x0_ids[] __initconst = {
548 { .compatible = "arm,pl310-cache", .data = (void *)&pl310_data },
549 { .compatible = "arm,l220-cache", .data = (void *)&l2x0_data },
550 { .compatible = "arm,l210-cache", .data = (void *)&l2x0_data },
554 int __init l2x0_of_init(u32 aux_val, u32 aux_mask)
556 struct device_node *np;
557 const struct l2x0_of_data *data;
560 np = of_find_matching_node(NULL, l2x0_ids);
564 if (of_address_to_resource(np, 0, &res))
567 l2x0_base = ioremap(res.start, resource_size(&res));
571 l2x0_saved_regs.phy_base = res.start;
573 data = of_match_node(l2x0_ids, np)->data;
575 /* L2 configuration can only be changed if the cache is disabled */
576 if (!(readl_relaxed(l2x0_base + L2X0_CTRL) & 1)) {
578 data->setup(np, &aux_val, &aux_mask);
584 l2x0_init(l2x0_base, aux_val, aux_mask);
586 outer_cache.resume = data->resume;