diff options
Diffstat (limited to 'kernel/arch/arm/mach-omap2/prminst44xx.c')
| -rw-r--r-- | kernel/arch/arm/mach-omap2/prminst44xx.c | 196 |
1 files changed, 196 insertions, 0 deletions
diff --git a/kernel/arch/arm/mach-omap2/prminst44xx.c b/kernel/arch/arm/mach-omap2/prminst44xx.c new file mode 100644 index 000000000..d0b15dbaf --- /dev/null +++ b/kernel/arch/arm/mach-omap2/prminst44xx.c @@ -0,0 +1,196 @@ +/* + * OMAP4 PRM instance functions + * + * Copyright (C) 2009 Nokia Corporation + * Copyright (C) 2011 Texas Instruments, Inc. + * Paul Walmsley + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/kernel.h> +#include <linux/types.h> +#include <linux/errno.h> +#include <linux/err.h> +#include <linux/io.h> + +#include "iomap.h" +#include "common.h" +#include "prcm-common.h" +#include "prm44xx.h" +#include "prm54xx.h" +#include "prm7xx.h" +#include "prminst44xx.h" +#include "prm-regbits-44xx.h" +#include "prcm44xx.h" +#include "prcm43xx.h" +#include "prcm_mpu44xx.h" +#include "soc.h" + +static void __iomem *_prm_bases[OMAP4_MAX_PRCM_PARTITIONS]; + +static s32 prm_dev_inst = PRM_INSTANCE_UNKNOWN; + +/** + * 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) +{ + _prm_bases[OMAP4430_PRM_PARTITION] = prm_base; + _prm_bases[OMAP4430_PRCM_MPU_PARTITION] = prcm_mpu_base; +} + +s32 omap4_prmst_get_prm_dev_inst(void) +{ + return prm_dev_inst; +} + +void omap4_prminst_set_prm_dev_inst(s32 dev_inst) +{ + prm_dev_inst = dev_inst; +} + +/* 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]); + return readl_relaxed(_prm_bases[part] + 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]); + writel_relaxed(val, _prm_bases[part] + 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_rmw_inst_reg_bits(mask, mask, part, inst, rstctrl_offs); + + return 0; +} + +/** + * 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); + + return (c == MAX_MODULE_HARDRESET_WAIT) ? -EBUSY : 0; +} + + +void omap4_prminst_global_warm_sw_reset(void) +{ + u32 v; + s32 inst = omap4_prmst_get_prm_dev_inst(); + + if (inst == PRM_INSTANCE_UNKNOWN) + return; + + v = omap4_prminst_read_inst_reg(OMAP4430_PRM_PARTITION, inst, + OMAP4_PRM_RSTCTRL_OFFSET); + v |= OMAP4430_RST_GLOBAL_WARM_SW_MASK; + omap4_prminst_write_inst_reg(v, OMAP4430_PRM_PARTITION, + inst, OMAP4_PRM_RSTCTRL_OFFSET); + + /* OCP barrier */ + v = omap4_prminst_read_inst_reg(OMAP4430_PRM_PARTITION, + inst, OMAP4_PRM_RSTCTRL_OFFSET); +} |