1 /* 2 * arch/arm/mm/cache-l2x0.c - L210/L220 cache controller support 3 * 4 * Copyright (C) 2007 ARM Limited 5 * 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. 9 * 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. 14 * 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 18 */ 19 #include <linux/init.h> 20 #include <linux/spinlock.h> 21 22 #include <asm/cacheflush.h> 23 #include <asm/io.h> 24 #include <asm/hardware/cache-l2x0.h> 25 26 #define CACHE_LINE_SIZE 32 27 28 static void __iomem *l2x0_base; 29 static DEFINE_SPINLOCK(l2x0_lock); 30 31 static inline void sync_writel(unsigned long val, unsigned long reg, 32 unsigned long complete_mask) 33 { 34 unsigned long flags; 35 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) 40 ; 41 spin_unlock_irqrestore(&l2x0_lock, flags); 42 } 43 44 static inline void cache_sync(void) 45 { 46 sync_writel(0, L2X0_CACHE_SYNC, 1); 47 } 48 49 static inline void l2x0_inv_all(void) 50 { 51 /* invalidate all ways */ 52 sync_writel(0xff, L2X0_INV_WAY, 0xff); 53 cache_sync(); 54 } 55 56 static void l2x0_inv_range(unsigned long start, unsigned long end) 57 { 58 unsigned long addr; 59 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; 64 } 65 66 if (end & (CACHE_LINE_SIZE - 1)) { 67 end &= ~(CACHE_LINE_SIZE - 1); 68 sync_writel(end, L2X0_CLEAN_INV_LINE_PA, 1); 69 } 70 71 for (addr = start; addr < end; addr += CACHE_LINE_SIZE) 72 sync_writel(addr, L2X0_INV_LINE_PA, 1); 73 cache_sync(); 74 } 75 76 static void l2x0_clean_range(unsigned long start, unsigned long end) 77 { 78 unsigned long addr; 79 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); 83 cache_sync(); 84 } 85 86 static void l2x0_flush_range(unsigned long start, unsigned long end) 87 { 88 unsigned long addr; 89 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); 93 cache_sync(); 94 } 95 96 void __init l2x0_init(void __iomem *base, __u32 aux_val, __u32 aux_mask) 97 { 98 __u32 aux; 99 100 l2x0_base = base; 101 102 /* disable L2X0 */ 103 writel(0, l2x0_base + L2X0_CTRL); 104 105 aux = readl(l2x0_base + L2X0_AUX_CTRL); 106 aux &= aux_mask; 107 aux |= aux_val; 108 writel(aux, l2x0_base + L2X0_AUX_CTRL); 109 110 l2x0_inv_all(); 111 112 /* enable L2X0 */ 113 writel(1, l2x0_base + L2X0_CTRL); 114 115 outer_cache.inv_range = l2x0_inv_range; 116 outer_cache.clean_range = l2x0_clean_range; 117 outer_cache.flush_range = l2x0_flush_range; 118 119 printk(KERN_INFO "L2X0 cache controller enabled\n"); 120 } 121