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93bc21930a
PL310 is the L2$ controller from ARM used in many SoCs including the Cortex-A9 based OMAP4430 Add support for some of the key PL310 operations - Invalidate all - Invalidate range - Flush(clean & invalidate) all - Flush range Signed-off-by: Aneesh V <aneesh@ti.com>
115 lines
3.1 KiB
C
115 lines
3.1 KiB
C
/*
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* (C) Copyright 2010
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* Texas Instruments, <www.ti.com>
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* Aneesh V <aneesh@ti.com>
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <linux/types.h>
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#include <asm/io.h>
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#include <asm/armv7.h>
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#include <asm/pl310.h>
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#include <config.h>
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struct pl310_regs *const pl310 = (struct pl310_regs *)CONFIG_SYS_PL310_BASE;
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static void pl310_cache_sync(void)
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{
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writel(0, &pl310->pl310_cache_sync);
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}
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static void pl310_background_op_all_ways(u32 *op_reg)
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{
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u32 assoc_16, associativity, way_mask;
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assoc_16 = readl(&pl310->pl310_aux_ctrl) &
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PL310_AUX_CTRL_ASSOCIATIVITY_MASK;
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if (assoc_16)
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associativity = 16;
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else
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associativity = 8;
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way_mask = (1 << associativity) - 1;
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/* Invalidate all ways */
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writel(way_mask, op_reg);
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/* Wait for all ways to be invalidated */
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while (readl(op_reg) && way_mask)
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;
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pl310_cache_sync();
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}
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void v7_outer_cache_inval_all(void)
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{
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pl310_background_op_all_ways(&pl310->pl310_inv_way);
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}
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void v7_outer_cache_flush_all(void)
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{
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pl310_background_op_all_ways(&pl310->pl310_clean_inv_way);
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}
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/* Flush(clean invalidate) memory from start to stop-1 */
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void v7_outer_cache_flush_range(u32 start, u32 stop)
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{
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/* PL310 currently supports only 32 bytes cache line */
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u32 pa, line_size = 32;
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/*
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* Align to the beginning of cache-line - this ensures that
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* the first 5 bits are 0 as required by PL310 TRM
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*/
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start &= ~(line_size - 1);
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for (pa = start; pa < stop; pa = pa + line_size)
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writel(pa, &pl310->pl310_clean_inv_line_pa);
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pl310_cache_sync();
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}
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/* invalidate memory from start to stop-1 */
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void v7_outer_cache_inval_range(u32 start, u32 stop)
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{
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/* PL310 currently supports only 32 bytes cache line */
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u32 pa, line_size = 32;
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/*
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* If start address is not aligned to cache-line flush the first
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* line to prevent affecting somebody else's buffer
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*/
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if (start & (line_size - 1)) {
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v7_outer_cache_flush_range(start, start + 1);
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/* move to next cache line */
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start = (start + line_size - 1) & ~(line_size - 1);
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}
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/*
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* If stop address is not aligned to cache-line flush the last
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* line to prevent affecting somebody else's buffer
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*/
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if (stop & (line_size - 1)) {
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v7_outer_cache_flush_range(stop, stop + 1);
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/* align to the beginning of this cache line */
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stop &= ~(line_size - 1);
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}
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for (pa = start; pa < stop; pa = pa + line_size)
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writel(pa, &pl310->pl310_inv_line_pa);
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pl310_cache_sync();
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}
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