From e32d59a2fa6446b64167bba31c0dd40eb023e8bb Mon Sep 17 00:00:00 2001 From: York Sun Date: Tue, 6 Jan 2015 13:18:55 -0800 Subject: [PATCH] driver/ddr/fsl: Add sync of refresh Add sync of refresh for multiple DDR controllers. DDRC initialization needs to complete first. Code is re-ordered to keep refresh close. Signed-off-by: York Sun --- README | 3 +++ drivers/ddr/fsl/main.c | 4 +++ drivers/ddr/fsl/util.c | 55 ++++++++++++++++++++++++++++++++++++++++++ include/fsl_ddr.h | 2 ++ 4 files changed, 64 insertions(+) diff --git a/README b/README index ba57dc5617..6800b959ca 100644 --- a/README +++ b/README @@ -4916,6 +4916,9 @@ Low Level (hardware related) configuration options: - CONFIG_FSL_DDR_INTERACTIVE Enable interactive DDR debugging. See doc/README.fsl-ddr. +- CONFIG_FSL_DDR_SYNC_REFRESH + Enable sync of refresh for multiple controllers. + - CONFIG_SYS_83XX_DDR_USES_CS0 Only for 83xx systems. If specified, then DDR should be configured using CS0 and CS1 instead of CS2 and CS3. diff --git a/drivers/ddr/fsl/main.c b/drivers/ddr/fsl/main.c index f49939b135..b72b24290e 100644 --- a/drivers/ddr/fsl/main.c +++ b/drivers/ddr/fsl/main.c @@ -692,6 +692,10 @@ phys_size_t __fsl_ddr_sdram(fsl_ddr_info_t *pinfo) } } +#ifdef CONFIG_FSL_DDR_SYNC_REFRESH + fsl_ddr_sync_memctl_refresh(first_ctrl, last_ctrl); +#endif + #ifdef CONFIG_PPC /* program LAWs */ for (i = first_ctrl; i <= last_ctrl; i++) { diff --git a/drivers/ddr/fsl/util.c b/drivers/ddr/fsl/util.c index ad569de27a..664081b1b8 100644 --- a/drivers/ddr/fsl/util.c +++ b/drivers/ddr/fsl/util.c @@ -308,3 +308,58 @@ void board_add_ram_info(int use_default) { detail_board_ddr_info(); } + +#ifdef CONFIG_FSL_DDR_SYNC_REFRESH +#define DDRC_DEBUG20_INIT_DONE 0x80000000 +#define DDRC_DEBUG2_RF 0x00000040 +void fsl_ddr_sync_memctl_refresh(unsigned int first_ctrl, + unsigned int last_ctrl) +{ + unsigned int i; + u32 ddrc_debug20; + u32 ddrc_debug2[CONFIG_NUM_DDR_CONTROLLERS] = {}; + u32 *ddrc_debug2_p[CONFIG_NUM_DDR_CONTROLLERS] = {}; + struct ccsr_ddr __iomem *ddr; + + for (i = first_ctrl; i <= last_ctrl; i++) { + switch (i) { + case 0: + ddr = (void *)CONFIG_SYS_FSL_DDR_ADDR; + break; +#if defined(CONFIG_SYS_FSL_DDR2_ADDR) && (CONFIG_NUM_DDR_CONTROLLERS > 1) + case 1: + ddr = (void *)CONFIG_SYS_FSL_DDR2_ADDR; + break; +#endif +#if defined(CONFIG_SYS_FSL_DDR3_ADDR) && (CONFIG_NUM_DDR_CONTROLLERS > 2) + case 2: + ddr = (void *)CONFIG_SYS_FSL_DDR3_ADDR; + break; +#endif +#if defined(CONFIG_SYS_FSL_DDR4_ADDR) && (CONFIG_NUM_DDR_CONTROLLERS > 3) + case 3: + ddr = (void *)CONFIG_SYS_FSL_DDR4_ADDR; + break; +#endif + default: + printf("%s unexpected ctrl = %u\n", __func__, i); + return; + } + ddrc_debug20 = ddr_in32(&ddr->debug[19]); + ddrc_debug2_p[i] = &ddr->debug[1]; + while (!(ddrc_debug20 & DDRC_DEBUG20_INIT_DONE)) { + /* keep polling until DDRC init is done */ + udelay(100); + ddrc_debug20 = ddr_in32(&ddr->debug[19]); + } + ddrc_debug2[i] = ddr_in32(&ddr->debug[1]) | DDRC_DEBUG2_RF; + } + /* + * Sync refresh + * This is put together to make sure the refresh reqeusts are sent + * closely to each other. + */ + for (i = first_ctrl; i <= last_ctrl; i++) + ddr_out32(ddrc_debug2_p[i], ddrc_debug2[i]); +} +#endif /* CONFIG_FSL_DDR_SYNC_REFRESH */ diff --git a/include/fsl_ddr.h b/include/fsl_ddr.h index 96fde91687..feccef9c9c 100644 --- a/include/fsl_ddr.h +++ b/include/fsl_ddr.h @@ -118,6 +118,8 @@ void fsl_ddr_set_lawbar( const common_timing_params_t *memctl_common_params, unsigned int memctl_interleaved, unsigned int ctrl_num); +void fsl_ddr_sync_memctl_refresh(unsigned int first_ctrl, + unsigned int last_ctrl); int fsl_ddr_interactive_env_var_exists(void); unsigned long long fsl_ddr_interactive(fsl_ddr_info_t *pinfo, int var_is_set); -- 2.30.2