/** * omap_prm_base_init - Populates the prm partitions * * Populates the base addresses of the _prm_bases * array used for read/write of prm module registers.
*/ void omap_prm_base_init(void)
{
memcpy(&_prm_bases[OMAP4430_PRM_PARTITION], &prm_base, sizeof(prm_base));
memcpy(&_prm_bases[OMAP4430_PRCM_MPU_PARTITION], &prcm_mpu_base, sizeof(prcm_mpu_base));
}
/* Read a register in a PRM instance */
u32 omap4_prminst_read_inst_reg(u8 part, s16 inst, u16 idx)
{
BUG_ON(part >= OMAP4_MAX_PRCM_PARTITIONS ||
part == OMAP4430_INVALID_PRCM_PARTITION ||
!_prm_bases[part].va); return readl_relaxed(_prm_bases[part].va + inst + idx);
}
/* Write into a register in a PRM instance */ void omap4_prminst_write_inst_reg(u32 val, u8 part, s16 inst, u16 idx)
{
BUG_ON(part >= OMAP4_MAX_PRCM_PARTITIONS ||
part == OMAP4430_INVALID_PRCM_PARTITION ||
!_prm_bases[part].va);
writel_relaxed(val, _prm_bases[part].va + inst + idx);
}
/* Read-modify-write a register in PRM. Caller must lock */
u32 omap4_prminst_rmw_inst_reg_bits(u32 mask, u32 bits, u8 part, s16 inst,
u16 idx)
{
u32 v;
v = omap4_prminst_read_inst_reg(part, inst, idx);
v &= ~mask;
v |= bits;
omap4_prminst_write_inst_reg(v, part, inst, idx);
return v;
}
/** * omap4_prminst_is_hardreset_asserted - read the HW reset line state of * submodules contained in the hwmod module * @rstctrl_reg: RM_RSTCTRL register address for this module * @shift: register bit shift corresponding to the reset line to check * * Returns 1 if the (sub)module hardreset line is currently asserted, * 0 if the (sub)module hardreset line is not currently asserted, or * -EINVAL upon parameter error.
*/ int omap4_prminst_is_hardreset_asserted(u8 shift, u8 part, s16 inst,
u16 rstctrl_offs)
{
u32 v;
v = omap4_prminst_read_inst_reg(part, inst, rstctrl_offs);
v &= 1 << shift;
v >>= shift;
return v;
}
/** * omap4_prminst_assert_hardreset - assert the HW reset line of a submodule * @rstctrl_reg: RM_RSTCTRL register address for this module * @shift: register bit shift corresponding to the reset line to assert * * Some IPs like dsp, ipu or iva contain processors that require an HW * reset line to be asserted / deasserted in order to fully enable the * IP. These modules may have multiple hard-reset lines that reset * different 'submodules' inside the IP block. This function will * place the submodule into reset. Returns 0 upon success or -EINVAL * upon an argument error.
*/ int omap4_prminst_assert_hardreset(u8 shift, u8 part, s16 inst,
u16 rstctrl_offs)
{
u32 mask = 1 << shift;
/** * omap4_prminst_deassert_hardreset - deassert a submodule hardreset line and * wait * @shift: register bit shift corresponding to the reset line to deassert * @st_shift: status bit offset corresponding to the reset line * @part: PRM partition * @inst: PRM instance offset * @rstctrl_offs: reset register offset * @rstst_offs: reset status register offset * * Some IPs like dsp, ipu or iva contain processors that require an HW * reset line to be asserted / deasserted in order to fully enable the * IP. These modules may have multiple hard-reset lines that reset * different 'submodules' inside the IP block. This function will * take the submodule out of reset and wait until the PRCM indicates * that the reset has completed before returning. Returns 0 upon success or * -EINVAL upon an argument error, -EEXIST if the submodule was already out * of reset, or -EBUSY if the submodule did not exit reset promptly.
*/ int omap4_prminst_deassert_hardreset(u8 shift, u8 st_shift, u8 part, s16 inst,
u16 rstctrl_offs, u16 rstst_offs)
{ int c;
u32 mask = 1 << shift;
u32 st_mask = 1 << st_shift;
/* Check the current status to avoid de-asserting the line twice */ if (omap4_prminst_is_hardreset_asserted(shift, part, inst,
rstctrl_offs) == 0) return -EEXIST;
/* Clear the reset status by writing 1 to the status bit */
omap4_prminst_rmw_inst_reg_bits(0xffffffff, st_mask, part, inst,
rstst_offs); /* de-assert the reset control line */
omap4_prminst_rmw_inst_reg_bits(mask, 0, part, inst, rstctrl_offs); /* wait the status to be set */
omap_test_timeout(omap4_prminst_is_hardreset_asserted(st_shift, part,
inst, rstst_offs),
MAX_MODULE_HARDRESET_WAIT, c);
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