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 --- V2: * More descriptive commit message * Changes for function pointer to weakly linked change * C struct for register accesses --- README | 6 ++ arch/arm/include/asm/pl310.h | 73 ++++++++++++++++++++++++++ arch/arm/lib/Makefile | 1 + arch/arm/lib/cache-pl310.c | 115 ++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 195 insertions(+), 0 deletions(-) create mode 100644 arch/arm/include/asm/pl310.h create mode 100644 arch/arm/lib/cache-pl310.c
diff --git a/README b/README index ca1520d..978e438 100644 --- a/README +++ b/README @@ -465,6 +465,12 @@ The following options need to be configured: CONFIG_SYS_DCACHE_OFF - Do not enable data cache in U-Boot CONFIG_SYS_L2CACHE_OFF- Do not enable L2 cache in U-Boot
+- Cache Configuration for ARM: + CONFIG_SYS_L2_PL310 - Enable support for ARM PL310 L2 cache + controller + CONFIG_SYS_PL310_BASE - Physical base address of PL310 + controller register space + - Serial Ports: CONFIG_PL010_SERIAL
diff --git a/arch/arm/include/asm/pl310.h b/arch/arm/include/asm/pl310.h new file mode 100644 index 0000000..fb506e6 --- /dev/null +++ b/arch/arm/include/asm/pl310.h @@ -0,0 +1,73 @@ +/* + * (C) Copyright 2010 + * Texas Instruments, <www.ti.com> + * Aneesh V aneesh@ti.com + * + * See file CREDITS for list of people who contributed to this + * project. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ +#ifndef _PL310_H_ +#define _PL310_H_ + +#include <linux/types.h> + +/* Register bit fields */ +#define PL310_AUX_CTRL_ASSOCIATIVITY_MASK (1 << 16) + +struct pl310_regs { + u32 pl310_cache_id; + u32 pl310_cache_type; + u32 pad1[62]; + u32 pl310_ctrl; + u32 pl310_aux_ctrl; + u32 pl310_tag_latency_ctrl; + u32 pl310_data_latency_ctrl; + u32 pad2[60]; + u32 pl310_event_cnt_ctrl; + u32 pl310_event_cnt1_cfg; + u32 pl310_event_cnt0_cfg; + u32 pl310_event_cnt1_val; + u32 pl310_event_cnt0_val; + u32 pl310_intr_mask; + u32 pl310_masked_intr_stat; + u32 pl310_raw_intr_stat; + u32 pl310_intr_clear; + u32 pad3[323]; + u32 pl310_cache_sync; + u32 pad4[15]; + u32 pl310_inv_line_pa; + u32 pad5[2]; + u32 pl310_inv_way; + u32 pad6[12]; + u32 pl310_clean_line_pa; + u32 pad7[1]; + u32 pl310_clean_line_idx; + u32 pl310_clean_way; + u32 pad8[12]; + u32 pl310_clean_inv_line_pa; + u32 pad9[1]; + u32 pl310_clean_inv_line_idx; + u32 pl310_clean_inv_way; +}; + +void pl310_inval_all(void); +void pl310_clean_inval_all(void); +void pl310_inval_range(u32 start, u32 end); +void pl310_clean_inval_range(u32 start, u32 end); + +#endif diff --git a/arch/arm/lib/Makefile b/arch/arm/lib/Makefile index f993d74..d31321a 100644 --- a/arch/arm/lib/Makefile +++ b/arch/arm/lib/Makefile @@ -40,6 +40,7 @@ COBJS-y += board.o COBJS-y += bootm.o COBJS-y += cache.o COBJS-y += cache-cp15.o +COBJS-$(CONFIG_SYS_L2_PL310) += cache-pl310.o COBJS-y += interrupts.o COBJS-y += reset.o SOBJS-$(CONFIG_USE_ARCH_MEMSET) += memset.o diff --git a/arch/arm/lib/cache-pl310.c b/arch/arm/lib/cache-pl310.c new file mode 100644 index 0000000..36c629c --- /dev/null +++ b/arch/arm/lib/cache-pl310.c @@ -0,0 +1,115 @@ +/* + * (C) Copyright 2010 + * Texas Instruments, <www.ti.com> + * Aneesh V aneesh@ti.com + * + * See file CREDITS for list of people who contributed to this + * project. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ +#include <linux/types.h> +#include <asm/io.h> +#include <asm/armv7.h> +#include <asm/pl310.h> +#include <config.h> + +struct pl310_regs *const pl310 = (struct pl310_regs *)CONFIG_SYS_PL310_BASE; + +static void pl310_cache_sync(void) +{ + writel(0, &pl310->pl310_cache_sync); +} + +static void pl310_background_op_all_ways(u32 *op_reg) +{ + u32 assoc_16, associativity, way_mask; + + assoc_16 = readl(&pl310->pl310_aux_ctrl) & + PL310_AUX_CTRL_ASSOCIATIVITY_MASK; + if (assoc_16) + associativity = 16; + else + associativity = 8; + + way_mask = (1 << associativity) - 1; + /* Invalidate all ways */ + writel(way_mask, op_reg); + /* Wait for all ways to be invalidated */ + while (readl(op_reg) && way_mask) + ; + pl310_cache_sync(); +} + +void v7_outer_cache_inval_all(void) +{ + pl310_background_op_all_ways(&pl310->pl310_inv_way); +} + +void v7_outer_cache_flush_all(void) +{ + pl310_background_op_all_ways(&pl310->pl310_clean_inv_way); +} + +/* Flush(clean invalidate) memory from start to stop-1 */ +void v7_outer_cache_flush_range(u32 start, u32 stop) +{ + /* PL310 currently supports only 32 bytes cache line */ + u32 pa, line_size = 32; + + /* + * Align to the beginning of cache-line - this ensures that + * the first 5 bits are 0 as required by PL310 TRM + */ + start &= ~(line_size - 1); + + for (pa = start; pa < stop; pa = pa + line_size) + writel(pa, &pl310->pl310_clean_inv_line_pa); + + pl310_cache_sync(); +} + +/* invalidate memory from start to stop-1 */ +void v7_outer_cache_inval_range(u32 start, u32 stop) +{ + /* PL310 currently supports only 32 bytes cache line */ + u32 pa, line_size = 32; + + /* + * If start address is not aligned to cache-line flush the first + * line to prevent affecting somebody else's buffer + */ + if (start & (line_size - 1)) { + v7_outer_cache_flush_range(start, start + 1); + /* move to next cache line */ + start = (start + line_size - 1) & ~(line_size - 1); + } + + /* + * If stop address is not aligned to cache-line flush the last + * line to prevent affecting somebody else's buffer + */ + if (stop & (line_size - 1)) { + v7_outer_cache_flush_range(stop, stop + 1); + /* align to the beginning of this cache line */ + stop &= ~(line_size - 1); + } + + for (pa = start; pa < stop; pa = pa + line_size) + writel(pa, &pl310->pl310_inv_line_pa); + + pl310_cache_sync(); +}