switch DSP off/on

Hi Ran,

In EZSDK we have DSP firmware which is loaded after u-boot and kernel:

root@dm814x-evm:~# firmware_loader 0 /usr/share/ti/ti-media-controller-utils/dm814x_c6xdsp.xe674 start

root@dm814x-evm:~# firmware_loader 0 /usr/share/ti/ti-media-controller-utils/dm814x_c6xdsp.xe674 stop

In u-boot and linux kernel, you can reuse the code from the DM814x GEL file (used in CCStudio):

#define CTRL_MODULE_BASE_ADDR 0x48140000
#define GEM_L2RAM_BASE_ADDR 0x40800000

/* Control Module*/
#define CM_CTRL_CLKCTRL 0x481815c4
#define DSPBOOTADDR (CTRL_MODULE_BASE_ADDR + 0x0048)
#define DSPMEM_SLEEP (CTRL_MODULE_BASE_ADDR + 0x0650)
#define GMII_SELECT (CTRL_MODULE_BASE_ADDR + 0x0650)
#define CM_ALWON_L3_SLOW_CLKSTCTRL (PRCM_BASE_ADDR + 0x1400)

/*GEMSS PRCM definition*/
#define CM_GEM_CLKSTCTRL (PRCM_BASE_ADDR + 0x0400)
#define CM_ACTIVE_GEM_CLKCTRL (PRCM_BASE_ADDR + 0x0420)
#define PM_ACTIVE_PWRSTST (PRCM_BASE_ADDR + 0x0A04)
#define RM_ACTIVE_RSTCTRL (PRCM_BASE_ADDR + 0x0A10)
#define RM_ACTIVE_RSTST (PRCM_BASE_ADDR + 0x0A14)

#define CM_MMU_CLKSTCTRL (PRCM_BASE_ADDR + 0x140C)
#define CM_ALWON_MMUDATA_CLKCTRL (PRCM_BASE_ADDR + 0x159C)

#define CM_MMUCFG_CLKSTCTRL (PRCM_BASE_ADDR + 0x1410)
#define CM_ALWON_MMUCFG_CLKCTRL (PRCM_BASE_ADDR + 0x15A8)
/*END OF GEMSS PRCM Definition*/

#define DSP_PLL_BASE (PLL_BASE_ADDRESS+0x080)

#define DSPPLL_CLOCK_CONTROL (PLL_SUBSYSTEM_BASE_ADDR + 0x084)

DSP_PLL_Config();

GEMSSClkEnable()

BR
Pavel

Hi Pavel,

Thank you very much for the info.
Do I switch between on/off state using the DSPMEM_SLEEP ? If yes - where is the "dsp loading" relevant for this case ?

Thanks!
Ran

For power off/on the DSP, see bit PM_ACTIVE_PWRSTCTRL[1:0] PowerState

See also http://e2e.ti.com/support/dsp/davinci_digital_media_processors/f/716/p/256582/912194#912194

Thank you,

Do you think it is correct to load the dsp binary at startup and then turn off/on the dsp in runtime for power saving ?

Regards,
Ran

I think this is correct.

BR
Pavel