arch/arm/mach-omap2/cm3xxx.c

Source file repositories/reference/linux-study-clean/arch/arm/mach-omap2/cm3xxx.c

File Facts

System
Linux kernel
Corpus path
arch/arm/mach-omap2/cm3xxx.c
Extension
.c
Size
22314 bytes
Lines
679
Domain
Architecture Layer
Bucket
arch/arm
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

struct omap3_cm_regs {
	u32 iva2_cm_clksel1;
	u32 iva2_cm_clksel2;
	u32 cm_sysconfig;
	u32 sgx_cm_clksel;
	u32 dss_cm_clksel;
	u32 cam_cm_clksel;
	u32 per_cm_clksel;
	u32 emu_cm_clksel;
	u32 emu_cm_clkstctrl;
	u32 pll_cm_autoidle;
	u32 pll_cm_autoidle2;
	u32 pll_cm_clksel4;
	u32 pll_cm_clksel5;
	u32 pll_cm_clken2;
	u32 cm_polctrl;
	u32 iva2_cm_fclken;
	u32 iva2_cm_clken_pll;
	u32 core_cm_fclken1;
	u32 core_cm_fclken3;
	u32 sgx_cm_fclken;
	u32 wkup_cm_fclken;
	u32 dss_cm_fclken;
	u32 cam_cm_fclken;
	u32 per_cm_fclken;
	u32 usbhost_cm_fclken;
	u32 core_cm_iclken1;
	u32 core_cm_iclken2;
	u32 core_cm_iclken3;
	u32 sgx_cm_iclken;
	u32 wkup_cm_iclken;
	u32 dss_cm_iclken;
	u32 cam_cm_iclken;
	u32 per_cm_iclken;
	u32 usbhost_cm_iclken;
	u32 iva2_cm_autoidle2;
	u32 mpu_cm_autoidle2;
	u32 iva2_cm_clkstctrl;
	u32 mpu_cm_clkstctrl;
	u32 core_cm_clkstctrl;
	u32 sgx_cm_clkstctrl;
	u32 dss_cm_clkstctrl;
	u32 cam_cm_clkstctrl;
	u32 per_cm_clkstctrl;
	u32 neon_cm_clkstctrl;
	u32 usbhost_cm_clkstctrl;
	u32 core_cm_autoidle1;
	u32 core_cm_autoidle2;
	u32 core_cm_autoidle3;
	u32 wkup_cm_autoidle;
	u32 dss_cm_autoidle;
	u32 cam_cm_autoidle;
	u32 per_cm_autoidle;
	u32 usbhost_cm_autoidle;
	u32 sgx_cm_sleepdep;
	u32 dss_cm_sleepdep;
	u32 cam_cm_sleepdep;
	u32 per_cm_sleepdep;
	u32 usbhost_cm_sleepdep;
	u32 cm_clkout_ctrl;
};

static struct omap3_cm_regs cm_context;

void omap3_cm_save_context(void)
{
	cm_context.iva2_cm_clksel1 =
		omap2_cm_read_mod_reg(OMAP3430_IVA2_MOD, CM_CLKSEL1);
	cm_context.iva2_cm_clksel2 =
		omap2_cm_read_mod_reg(OMAP3430_IVA2_MOD, CM_CLKSEL2);
	cm_context.cm_sysconfig =
		omap2_cm_read_mod_reg(OCP_MOD, OMAP3430_CM_SYSCONFIG);
	cm_context.sgx_cm_clksel =
		omap2_cm_read_mod_reg(OMAP3430ES2_SGX_MOD, CM_CLKSEL);
	cm_context.dss_cm_clksel =
		omap2_cm_read_mod_reg(OMAP3430_DSS_MOD, CM_CLKSEL);
	cm_context.cam_cm_clksel =
		omap2_cm_read_mod_reg(OMAP3430_CAM_MOD, CM_CLKSEL);
	cm_context.per_cm_clksel =
		omap2_cm_read_mod_reg(OMAP3430_PER_MOD, CM_CLKSEL);
	cm_context.emu_cm_clksel =
		omap2_cm_read_mod_reg(OMAP3430_EMU_MOD, CM_CLKSEL1);
	cm_context.emu_cm_clkstctrl =
		omap2_cm_read_mod_reg(OMAP3430_EMU_MOD, OMAP2_CM_CLKSTCTRL);
	/*
	 * As per erratum i671, ROM code does not respect the PER DPLL
	 * programming scheme if CM_AUTOIDLE_PLL.AUTO_PERIPH_DPLL == 1.
	 * In this case, even though this register has been saved in
	 * scratchpad contents, we need to restore AUTO_PERIPH_DPLL
	 * by ourselves. So, we need to save it anyway.

Annotation

Implementation Notes