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mx6: Enable L2 cache support

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Add L2 cache support and enable it by default.

Configure the L2 cache in the same way as done by FSL kernel:
http://git.freescale.com/git/cgit.cgi/imx/linux-2.6-imx.git/tree/arch/arm/mach-mx6/mm.c?h=imx_3.0.35_4.1.0

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Acked-by: Dirk Behme <dirk.behme@gmail.com>
Acked-by: Stefano Babic <sbabic@denx.de>
This commit is contained in:
Fabio Estevam 2014-01-29 17:39:49 -02:00 committed by Stefano Babic
parent 4702c62dce
commit 6d73c23410
4 changed files with 85 additions and 0 deletions
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58
arch/arm/cpu/armv7/mx6/soc.c
View file

@ -8,6 +8,8 @@
*/
#include <common.h>
#include <asm/armv7.h>
#include <asm/pl310.h>
#include <asm/errno.h>
#include <asm/io.h>
#include <asm/arch/imx-regs.h>
@ -375,3 +377,59 @@ void imx_setup_hdmi(void)
writel(reg, &mxc_ccm->chsccdr);
}
#endif
#ifndef CONFIG_SYS_L2CACHE_OFF
#define IOMUXC_GPR11_L2CACHE_AS_OCRAM 0x00000002
void v7_outer_cache_enable(void)
{
struct pl310_regs *const pl310 = (struct pl310_regs *)L2_PL310_BASE;
unsigned int val;
#if defined CONFIG_MX6SL
struct iomuxc *iomux = (struct iomuxc *)IOMUXC_BASE_ADDR;
val = readl(&iomux->gpr[11]);
if (val & IOMUXC_GPR11_L2CACHE_AS_OCRAM) {
/* L2 cache configured as OCRAM, reset it */
val &= ~IOMUXC_GPR11_L2CACHE_AS_OCRAM;
writel(val, &iomux->gpr[11]);
}
#endif
writel(0x132, &pl310->pl310_tag_latency_ctrl);
writel(0x132, &pl310->pl310_data_latency_ctrl);
val = readl(&pl310->pl310_prefetch_ctrl);
/* Turn on the L2 I/D prefetch */
val |= 0x30000000;
/*
* The L2 cache controller(PL310) version on the i.MX6D/Q is r3p1-50rel0
* The L2 cache controller(PL310) version on the i.MX6DL/SOLO/SL is r3p2
* But according to ARM PL310 errata: 752271
* ID: 752271: Double linefill feature can cause data corruption
* Fault Status: Present in: r3p0, r3p1, r3p1-50rel0. Fixed in r3p2
* Workaround: The only workaround to this erratum is to disable the
* double linefill feature. This is the default behavior.
*/
#ifndef CONFIG_MX6Q
val |= 0x40800000;
#endif
writel(val, &pl310->pl310_prefetch_ctrl);
val = readl(&pl310->pl310_power_ctrl);
val |= L2X0_DYNAMIC_CLK_GATING_EN;
val |= L2X0_STNDBY_MODE_EN;
writel(val, &pl310->pl310_power_ctrl);
setbits_le32(&pl310->pl310_ctrl, L2X0_CTRL_EN);
}
void v7_outer_cache_disable(void)
{
struct pl310_regs *const pl310 = (struct pl310_regs *)L2_PL310_BASE;
clrbits_le32(&pl310->pl310_ctrl, L2X0_CTRL_EN);
}
#endif /* !CONFIG_SYS_L2CACHE_OFF */

1
arch/arm/include/asm/arch-mx6/imx-regs.h
View file

@ -53,6 +53,7 @@
#define GLOBAL_TIMER_BASE_ADDR 0x00A00200
#define PRIVATE_TIMERS_WD_BASE_ADDR 0x00A00600
#define IC_DISTRIBUTOR_BASE_ADDR 0x00A01000
#define L2_PL310_BASE 0x00A02000
#define GPV0_BASE_ADDR 0x00B00000
#define GPV1_BASE_ADDR 0x00C00000
#define PCIE_ARB_BASE_ADDR 0x01000000

21
arch/arm/include/asm/pl310.h
View file

@ -12,6 +12,9 @@
/* Register bit fields */
#define PL310_AUX_CTRL_ASSOCIATIVITY_MASK (1 << 16)
#define L2X0_DYNAMIC_CLK_GATING_EN (1 << 1)
#define L2X0_STNDBY_MODE_EN (1 << 0)
#define L2X0_CTRL_EN 1
struct pl310_regs {
u32 pl310_cache_id;
@ -47,6 +50,24 @@ struct pl310_regs {
u32 pad9[1];
u32 pl310_clean_inv_line_idx;
u32 pl310_clean_inv_way;
u32 pad10[64];
u32 pl310_lockdown_dbase;
u32 pl310_lockdown_ibase;
u32 pad11[190];
u32 pl310_addr_filter_start;
u32 pl310_addr_filter_end;
u32 pad12[190];
u32 pl310_test_operation;
u32 pad13[3];
u32 pl310_line_data;
u32 pad14[7];
u32 pl310_line_tag;
u32 pad15[3];
u32 pl310_debug_ctrl;
u32 pad16[7];
u32 pl310_prefetch_ctrl;
u32 pad17[7];
u32 pl310_power_ctrl;
};
void pl310_inval_all(void);

5
include/configs/mx6_common.h
View file

@ -22,4 +22,9 @@
#define CONFIG_ARM_ERRATA_751472
#define CONFIG_BOARD_POSTCLK_INIT
#ifndef CONFIG_SYS_L2CACHE_OFF
#define CONFIG_SYS_L2_PL310
#define CONFIG_SYS_PL310_BASE L2_PL310_BASE
#endif
#endif