diff options
| -rw-r--r-- | README | 4 | ||||
| -rw-r--r-- | arch/arm/cpu/armv7/omap-common/clocks-common.c | 1 | ||||
| -rw-r--r-- | arch/arm/cpu/armv7/omap-common/reset.c | 4 | ||||
| -rw-r--r-- | arch/arm/cpu/armv7/omap5/hwinit.c | 19 | ||||
| -rw-r--r-- | arch/arm/cpu/armv7/omap5/prcm-regs.c | 2 | ||||
| -rw-r--r-- | arch/arm/include/asm/arch-omap4/sys_proto.h | 1 | ||||
| -rw-r--r-- | arch/arm/include/asm/arch-omap5/clocks.h | 10 | ||||
| -rw-r--r-- | arch/arm/include/asm/arch-omap5/sys_proto.h | 10 | ||||
| -rw-r--r-- | arch/arm/include/asm/omap_common.h | 1 | ||||
| -rw-r--r-- | doc/README.omap-reset-time | 20 | ||||
| -rw-r--r-- | include/configs/omap5_uevm.h | 1 |
11 files changed, 73 insertions, 0 deletions
@@ -3323,6 +3323,10 @@ Configuration Settings: offset _bss_start_ofs from CONFIG_SYS_TEXT_BASE, rather than directly. You should not need to touch this setting. +- CONFIG_OMAP_PLATFORM_RESET_TIME_MAX_USEC (OMAP only) + This is set by OMAP boards for the max time that reset should + be asserted. See doc/README.omap-reset-time for details on how + the value can be calulated on a given board. The following definitions that deal with the placement and management of environment data (variable area); in general, we support the diff --git a/arch/arm/cpu/armv7/omap-common/clocks-common.c b/arch/arm/cpu/armv7/omap-common/clocks-common.c index 2b955c7c00..99910cdcb0 100644 --- a/arch/arm/cpu/armv7/omap-common/clocks-common.c +++ b/arch/arm/cpu/armv7/omap-common/clocks-common.c @@ -716,6 +716,7 @@ void prcm_init(void) setup_non_essential_dplls(); enable_non_essential_clocks(); #endif + setup_warmreset_time(); break; default: break; diff --git a/arch/arm/cpu/armv7/omap-common/reset.c b/arch/arm/cpu/armv7/omap-common/reset.c index 587bb47745..57ea9d9999 100644 --- a/arch/arm/cpu/armv7/omap-common/reset.c +++ b/arch/arm/cpu/armv7/omap-common/reset.c @@ -39,3 +39,7 @@ u32 __weak warm_reset(void) { return (readl(PRM_RSTST) & PRM_RSTST_WARM_RESET_MASK); } + +void __weak setup_warmreset_time(void) +{ +} diff --git a/arch/arm/cpu/armv7/omap5/hwinit.c b/arch/arm/cpu/armv7/omap5/hwinit.c index 2f4b24752b..d29df78720 100644 --- a/arch/arm/cpu/armv7/omap5/hwinit.c +++ b/arch/arm/cpu/armv7/omap5/hwinit.c @@ -363,3 +363,22 @@ u32 warm_reset(void) { return readl((*prcm)->prm_rstst) & PRM_RSTST_WARM_RESET_MASK; } + +void setup_warmreset_time(void) +{ + u32 rst_time, rst_val; + +#ifndef CONFIG_OMAP_PLATFORM_RESET_TIME_MAX_USEC + rst_time = CONFIG_DEFAULT_OMAP_RESET_TIME_MAX_USEC; +#else + rst_time = CONFIG_OMAP_PLATFORM_RESET_TIME_MAX_USEC; +#endif + rst_time = usec_to_32k(rst_time) << RSTTIME1_SHIFT; + + if (rst_time > RSTTIME1_MASK) + rst_time = RSTTIME1_MASK; + + rst_val = readl((*prcm)->prm_rsttime) & ~RSTTIME1_MASK; + rst_val |= rst_time; + writel(rst_val, (*prcm)->prm_rsttime); +} diff --git a/arch/arm/cpu/armv7/omap5/prcm-regs.c b/arch/arm/cpu/armv7/omap5/prcm-regs.c index b8a61fe881..e9f6a32653 100644 --- a/arch/arm/cpu/armv7/omap5/prcm-regs.c +++ b/arch/arm/cpu/armv7/omap5/prcm-regs.c @@ -729,6 +729,7 @@ struct prcm_regs const omap5_es2_prcm = { .cm_wkupaon_io_srcomp_clkctrl = 0x4ae07998, .prm_rstctrl = 0x4ae07c00, .prm_rstst = 0x4ae07c04, + .prm_rsttime = 0x4ae07c08, .prm_vc_val_bypass = 0x4ae07ca0, .prm_vc_cfg_i2c_mode = 0x4ae07cb4, .prm_vc_cfg_i2c_clk = 0x4ae07cb8, @@ -952,6 +953,7 @@ struct prcm_regs const dra7xx_prcm = { .cm_wkupaon_scrm_clkctrl = 0x4ae07890, .prm_rstctrl = 0x4ae07d00, .prm_rstst = 0x4ae07d04, + .prm_rsttime = 0x4ae07d08, .prm_vc_val_bypass = 0x4ae07da0, .prm_vc_cfg_i2c_mode = 0x4ae07db4, .prm_vc_cfg_i2c_clk = 0x4ae07db8, diff --git a/arch/arm/include/asm/arch-omap4/sys_proto.h b/arch/arm/include/asm/arch-omap4/sys_proto.h index d5f1868eee..ac9c1f83ed 100644 --- a/arch/arm/include/asm/arch-omap4/sys_proto.h +++ b/arch/arm/include/asm/arch-omap4/sys_proto.h @@ -58,6 +58,7 @@ void omap_vc_init(u16 speed_khz); int omap_vc_bypass_send_value(u8 sa, u8 reg_addr, u8 reg_data); u32 warm_reset(void); void force_emif_self_refresh(void); +void setup_warmreset_time(void); /* * This is used to verify if the configuration header * was executed by Romcode prior to control of transfer diff --git a/arch/arm/include/asm/arch-omap5/clocks.h b/arch/arm/include/asm/arch-omap5/clocks.h index cfde374333..68afa76696 100644 --- a/arch/arm/include/asm/arch-omap5/clocks.h +++ b/arch/arm/include/asm/arch-omap5/clocks.h @@ -190,6 +190,10 @@ #define OPTFCLKEN_SRCOMP_FCLK_SHIFT 8 #define OPTFCLKEN_SRCOMP_FCLK_MASK (1 << 8) +/* PRM_RSTTIME */ +#define RSTTIME1_SHIFT 0 +#define RSTTIME1_MASK (0x3ff << 0) + /* Clock frequencies */ #define OMAP_SYS_CLK_FREQ_38_4_MHZ 38400000 #define OMAP_SYS_CLK_IND_38_4_MHZ 6 @@ -251,4 +255,10 @@ #define DPLL_NO_LOCK 0 #define DPLL_LOCK 1 +/* + * MAX value for PRM_RSTTIME[9:0]RSTTIME1 stored is 0x3ff. + * 0x3ff is in the no of FUNC_32K_CLK cycles. Converting cycles + * into microsec and passing the value. + */ +#define CONFIG_DEFAULT_OMAP_RESET_TIME_MAX_USEC 31219 #endif /* _CLOCKS_OMAP5_H_ */ diff --git a/arch/arm/include/asm/arch-omap5/sys_proto.h b/arch/arm/include/asm/arch-omap5/sys_proto.h index e66ab44341..393c8bfdb7 100644 --- a/arch/arm/include/asm/arch-omap5/sys_proto.h +++ b/arch/arm/include/asm/arch-omap5/sys_proto.h @@ -64,6 +64,7 @@ u32 warm_reset(void); void force_emif_self_refresh(void); void get_ioregs(const struct ctrl_ioregs **regs); void srcomp_enable(void); +void setup_warmreset_time(void); /* * This is used to verify if the configuration header @@ -122,4 +123,13 @@ static inline u32 omap_hw_init_context(void) #endif } +static inline u32 div_round_up(u32 num, u32 den) +{ + return (num + den - 1)/den; +} + +static inline u32 usec_to_32k(u32 usec) +{ + return div_round_up(32768 * usec, 1000000); +} #endif diff --git a/arch/arm/include/asm/omap_common.h b/arch/arm/include/asm/omap_common.h index 091ddb508d..6d377d5b59 100644 --- a/arch/arm/include/asm/omap_common.h +++ b/arch/arm/include/asm/omap_common.h @@ -316,6 +316,7 @@ struct prcm_regs { u32 cm_wkupaon_io_srcomp_clkctrl; u32 prm_rstctrl; u32 prm_rstst; + u32 prm_rsttime; u32 prm_vc_val_bypass; u32 prm_vc_cfg_i2c_mode; u32 prm_vc_cfg_i2c_clk; diff --git a/doc/README.omap-reset-time b/doc/README.omap-reset-time new file mode 100644 index 0000000000..0c974bacae --- /dev/null +++ b/doc/README.omap-reset-time @@ -0,0 +1,20 @@ +README on how reset time on OMAPs should be calculated + +CONFIG_OMAP_PLATFORM_RESET_TIME_MAX_USEC: +Most OMAPs' provide a way to specify the time for +which the reset should be held low while the voltages +and Oscillator outputs stabilize. + +This time is mostly board and PMIC dependent. Hence the +boards are expected to specify a pre-computed time +using the above option, (the details on how to compute +the value are given below) without which a default time +as specified by CONFIG_DEFAULT_OMAP_RESET_TIME_MAX_USEC +is used. + +The value for CONFIG_OMAP_PLATFORM_RESET_TIME_MAX_USEC +can be computed using a summation of the below 3 parameters +-1- Time taken by the Osciallator to stop and restart +-2- PMIC OTP time +-3- Voltage ramp time, which can be derived using the +PMIC slew rate and value of voltage ramp needed. diff --git a/include/configs/omap5_uevm.h b/include/configs/omap5_uevm.h index c5bf51d9c9..c791789cb7 100644 --- a/include/configs/omap5_uevm.h +++ b/include/configs/omap5_uevm.h @@ -54,4 +54,5 @@ #define CONFIG_SYS_PROMPT "OMAP5430 EVM # " +#define CONFIG_OMAP_PLATFORM_RESET_TIME_MAX_USEC 16296 #endif /* __CONFIG_OMAP5_EVM_H */ |
