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137d105d50
On OMAP4 SOC, intecronnects has many write buffers in the async bridges and they need to be drained before CPU enters into standby state. Patch 'OMAP4: PM: Add CPUX OFF mode support' added CPU PM support but OMAP errata i688 (Async Bridge Corruption) needs to be taken care to avoid issues like system freeze, CPU deadlocks, random crashes with register accesses, synchronisation loss on initiators operating on both interconnect port simultaneously. As per the errata, if a data is stalled inside asynchronous bridge because of back pressure, it may be accepted multiple times, creating pointer misalignment that will corrupt next transfers on that data path until next reset of the system (No recovery procedure once the issue is hit, the path remains consistently broken). Async bridge can be found on path between MPU to EMIF and MPU to L3 interconnect. This situation can happen only when the idle is initiated by a Master Request Disconnection (which is trigged by software when executing WFI on CPU). The work-around for this errata needs all the initiators connected through async bridge must ensure that data path is properly drained before issuing WFI. This condition will be met if one Strongly ordered access is performed to the target right before executing the WFI. In MPU case, L3 T2ASYNC FIFO and DDR T2ASYNC FIFO needs to be drained. IO barrier ensure that there is no synchronisation loss on initiators operating on both interconnect port simultaneously. Thanks to Russell for a tip to conver assembly function to C fuction there by reducing 40 odd lines of code from the patch. Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Signed-off-by: Richard Woodruff <r-woodruff2@ti.com> Acked-by: Jean Pihet <j-pihet@ti.com> Reviewed-by: Kevin Hilman <khilman@ti.com> Tested-by: Vishwanath BS <vishwanath.bs@ti.com> Signed-off-by: Kevin Hilman <khilman@ti.com>
105 lines
3.3 KiB
C
105 lines
3.3 KiB
C
/*
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* arch/arm/plat-omap/include/mach/sram.h
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*
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* Interface for functions that need to be run in internal SRAM
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef __ARCH_ARM_OMAP_SRAM_H
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#define __ARCH_ARM_OMAP_SRAM_H
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#ifndef __ASSEMBLY__
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#include <asm/fncpy.h>
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extern void *omap_sram_push_address(unsigned long size);
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/* Macro to push a function to the internal SRAM, using the fncpy API */
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#define omap_sram_push(funcp, size) ({ \
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typeof(&(funcp)) _res = NULL; \
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void *_sram_address = omap_sram_push_address(size); \
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if (_sram_address) \
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_res = fncpy(_sram_address, &(funcp), size); \
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_res; \
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})
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extern void omap_sram_reprogram_clock(u32 dpllctl, u32 ckctl);
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extern void omap2_sram_ddr_init(u32 *slow_dll_ctrl, u32 fast_dll_ctrl,
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u32 base_cs, u32 force_unlock);
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extern void omap2_sram_reprogram_sdrc(u32 perf_level, u32 dll_val,
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u32 mem_type);
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extern u32 omap2_set_prcm(u32 dpll_ctrl_val, u32 sdrc_rfr_val, int bypass);
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extern u32 omap3_configure_core_dpll(
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u32 m2, u32 unlock_dll, u32 f, u32 inc,
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u32 sdrc_rfr_ctrl_0, u32 sdrc_actim_ctrl_a_0,
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u32 sdrc_actim_ctrl_b_0, u32 sdrc_mr_0,
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u32 sdrc_rfr_ctrl_1, u32 sdrc_actim_ctrl_a_1,
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u32 sdrc_actim_ctrl_b_1, u32 sdrc_mr_1);
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extern void omap3_sram_restore_context(void);
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/* Do not use these */
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extern void omap1_sram_reprogram_clock(u32 ckctl, u32 dpllctl);
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extern unsigned long omap1_sram_reprogram_clock_sz;
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extern void omap24xx_sram_reprogram_clock(u32 ckctl, u32 dpllctl);
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extern unsigned long omap24xx_sram_reprogram_clock_sz;
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extern void omap242x_sram_ddr_init(u32 *slow_dll_ctrl, u32 fast_dll_ctrl,
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u32 base_cs, u32 force_unlock);
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extern unsigned long omap242x_sram_ddr_init_sz;
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extern u32 omap242x_sram_set_prcm(u32 dpll_ctrl_val, u32 sdrc_rfr_val,
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int bypass);
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extern unsigned long omap242x_sram_set_prcm_sz;
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extern void omap242x_sram_reprogram_sdrc(u32 perf_level, u32 dll_val,
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u32 mem_type);
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extern unsigned long omap242x_sram_reprogram_sdrc_sz;
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extern void omap243x_sram_ddr_init(u32 *slow_dll_ctrl, u32 fast_dll_ctrl,
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u32 base_cs, u32 force_unlock);
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extern unsigned long omap243x_sram_ddr_init_sz;
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extern u32 omap243x_sram_set_prcm(u32 dpll_ctrl_val, u32 sdrc_rfr_val,
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int bypass);
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extern unsigned long omap243x_sram_set_prcm_sz;
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extern void omap243x_sram_reprogram_sdrc(u32 perf_level, u32 dll_val,
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u32 mem_type);
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extern unsigned long omap243x_sram_reprogram_sdrc_sz;
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extern u32 omap3_sram_configure_core_dpll(
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u32 m2, u32 unlock_dll, u32 f, u32 inc,
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u32 sdrc_rfr_ctrl_0, u32 sdrc_actim_ctrl_a_0,
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u32 sdrc_actim_ctrl_b_0, u32 sdrc_mr_0,
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u32 sdrc_rfr_ctrl_1, u32 sdrc_actim_ctrl_a_1,
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u32 sdrc_actim_ctrl_b_1, u32 sdrc_mr_1);
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extern unsigned long omap3_sram_configure_core_dpll_sz;
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#ifdef CONFIG_PM
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extern void omap_push_sram_idle(void);
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#else
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static inline void omap_push_sram_idle(void) {}
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#endif /* CONFIG_PM */
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#endif /* __ASSEMBLY__ */
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/*
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* OMAP2+: define the SRAM PA addresses.
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* Used by the SRAM management code and the idle sleep code.
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*/
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#define OMAP2_SRAM_PA 0x40200000
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#define OMAP3_SRAM_PA 0x40200000
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#ifdef CONFIG_OMAP4_ERRATA_I688
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#define OMAP4_SRAM_PA 0x40304000
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#define OMAP4_SRAM_VA 0xfe404000
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#else
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#define OMAP4_SRAM_PA 0x40300000
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#endif
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#endif
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