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/init.h>
20 #include <linux/spinlock.h>
22 #include <asm/cacheflush.h>
24 #include <asm/hardware/cache-l2x0.h>
26 #define CACHE_LINE_SIZE 32
28 static void __iomem *l2x0_base;
29 static DEFINE_SPINLOCK(l2x0_lock);
31 static inline void sync_writel(unsigned long val, unsigned long reg,
32 unsigned long complete_mask)
36 spin_lock_irqsave(&l2x0_lock, flags);
37 writel(val, l2x0_base + reg);
38 /* wait for the operation to complete */
39 while (readl(l2x0_base + reg) & complete_mask)
41 spin_unlock_irqrestore(&l2x0_lock, flags);
44 static inline void cache_sync(void)
46 sync_writel(0, L2X0_CACHE_SYNC, 1);
49 static inline void l2x0_inv_all(void)
51 /* invalidate all ways */
52 sync_writel(0xff, L2X0_INV_WAY, 0xff);
56 static void l2x0_inv_range(unsigned long start, unsigned long end)
60 if (start & (CACHE_LINE_SIZE - 1)) {
61 start &= ~(CACHE_LINE_SIZE - 1);
62 sync_writel(start, L2X0_CLEAN_INV_LINE_PA, 1);
63 start += CACHE_LINE_SIZE;
66 if (end & (CACHE_LINE_SIZE - 1)) {
67 end &= ~(CACHE_LINE_SIZE - 1);
68 sync_writel(end, L2X0_CLEAN_INV_LINE_PA, 1);
71 for (addr = start; addr < end; addr += CACHE_LINE_SIZE)
72 sync_writel(addr, L2X0_INV_LINE_PA, 1);
76 static void l2x0_clean_range(unsigned long start, unsigned long end)
80 start &= ~(CACHE_LINE_SIZE - 1);
81 for (addr = start; addr < end; addr += CACHE_LINE_SIZE)
82 sync_writel(addr, L2X0_CLEAN_LINE_PA, 1);
86 static void l2x0_flush_range(unsigned long start, unsigned long end)
90 start &= ~(CACHE_LINE_SIZE - 1);
91 for (addr = start; addr < end; addr += CACHE_LINE_SIZE)
92 sync_writel(addr, L2X0_CLEAN_INV_LINE_PA, 1);
96 void __init l2x0_init(void __iomem *base, __u32 aux_val, __u32 aux_mask)
103 writel(0, l2x0_base + L2X0_CTRL);
105 aux = readl(l2x0_base + L2X0_AUX_CTRL);
108 writel(aux, l2x0_base + L2X0_AUX_CTRL);
113 writel(1, l2x0_base + L2X0_CTRL);
115 outer_cache.inv_range = l2x0_inv_range;
116 outer_cache.clean_range = l2x0_clean_range;
117 outer_cache.flush_range = l2x0_flush_range;
119 printk(KERN_INFO "L2X0 cache controller enabled\n");