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e3002d1ae1
PRM device instance can vary depending on SoC. We already handle the same during reset of the device, However, this is also needed for other logic instances. So, first abstract this out to a generic function. Signed-off-by: Nishanth Menon <nm@ti.com> Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
207 lines
6.1 KiB
C
207 lines
6.1 KiB
C
/*
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* OMAP4 PRM instance functions
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*
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* Copyright (C) 2009 Nokia Corporation
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* Copyright (C) 2011 Texas Instruments, Inc.
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* Paul Walmsley
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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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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/errno.h>
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#include <linux/err.h>
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#include <linux/io.h>
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#include "iomap.h"
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#include "common.h"
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#include "prcm-common.h"
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#include "prm44xx.h"
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#include "prm54xx.h"
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#include "prm7xx.h"
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#include "prminst44xx.h"
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#include "prm-regbits-44xx.h"
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#include "prcm44xx.h"
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#include "prcm43xx.h"
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#include "prcm_mpu44xx.h"
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#include "soc.h"
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static void __iomem *_prm_bases[OMAP4_MAX_PRCM_PARTITIONS];
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static s32 prm_dev_inst = PRM_INSTANCE_UNKNOWN;
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/**
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* omap_prm_base_init - Populates the prm partitions
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*
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* Populates the base addresses of the _prm_bases
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* array used for read/write of prm module registers.
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*/
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void omap_prm_base_init(void)
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{
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_prm_bases[OMAP4430_PRM_PARTITION] = prm_base;
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_prm_bases[OMAP4430_PRCM_MPU_PARTITION] = prcm_mpu_base;
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}
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s32 omap4_prmst_get_prm_dev_inst(void)
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{
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if (prm_dev_inst != PRM_INSTANCE_UNKNOWN)
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return prm_dev_inst;
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/* This cannot be done way early at boot.. as things are not setup */
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if (cpu_is_omap44xx())
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prm_dev_inst = OMAP4430_PRM_DEVICE_INST;
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else if (soc_is_omap54xx())
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prm_dev_inst = OMAP54XX_PRM_DEVICE_INST;
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else if (soc_is_dra7xx())
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prm_dev_inst = DRA7XX_PRM_DEVICE_INST;
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else if (soc_is_am43xx())
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prm_dev_inst = AM43XX_PRM_DEVICE_INST;
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return prm_dev_inst;
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}
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/* Read a register in a PRM instance */
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u32 omap4_prminst_read_inst_reg(u8 part, s16 inst, u16 idx)
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{
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BUG_ON(part >= OMAP4_MAX_PRCM_PARTITIONS ||
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part == OMAP4430_INVALID_PRCM_PARTITION ||
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!_prm_bases[part]);
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return readl_relaxed(_prm_bases[part] + inst + idx);
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}
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/* Write into a register in a PRM instance */
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void omap4_prminst_write_inst_reg(u32 val, u8 part, s16 inst, u16 idx)
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{
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BUG_ON(part >= OMAP4_MAX_PRCM_PARTITIONS ||
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part == OMAP4430_INVALID_PRCM_PARTITION ||
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!_prm_bases[part]);
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writel_relaxed(val, _prm_bases[part] + inst + idx);
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}
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/* Read-modify-write a register in PRM. Caller must lock */
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u32 omap4_prminst_rmw_inst_reg_bits(u32 mask, u32 bits, u8 part, s16 inst,
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u16 idx)
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{
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u32 v;
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v = omap4_prminst_read_inst_reg(part, inst, idx);
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v &= ~mask;
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v |= bits;
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omap4_prminst_write_inst_reg(v, part, inst, idx);
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return v;
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}
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/*
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* Address offset (in bytes) between the reset control and the reset
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* status registers: 4 bytes on OMAP4
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*/
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#define OMAP4_RST_CTRL_ST_OFFSET 4
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/**
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* omap4_prminst_is_hardreset_asserted - read the HW reset line state of
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* submodules contained in the hwmod module
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* @rstctrl_reg: RM_RSTCTRL register address for this module
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* @shift: register bit shift corresponding to the reset line to check
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*
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* Returns 1 if the (sub)module hardreset line is currently asserted,
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* 0 if the (sub)module hardreset line is not currently asserted, or
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* -EINVAL upon parameter error.
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*/
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int omap4_prminst_is_hardreset_asserted(u8 shift, u8 part, s16 inst,
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u16 rstctrl_offs)
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{
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u32 v;
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v = omap4_prminst_read_inst_reg(part, inst, rstctrl_offs);
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v &= 1 << shift;
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v >>= shift;
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return v;
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}
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/**
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* omap4_prminst_assert_hardreset - assert the HW reset line of a submodule
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* @rstctrl_reg: RM_RSTCTRL register address for this module
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* @shift: register bit shift corresponding to the reset line to assert
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*
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* Some IPs like dsp, ipu or iva contain processors that require an HW
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* reset line to be asserted / deasserted in order to fully enable the
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* IP. These modules may have multiple hard-reset lines that reset
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* different 'submodules' inside the IP block. This function will
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* place the submodule into reset. Returns 0 upon success or -EINVAL
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* upon an argument error.
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*/
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int omap4_prminst_assert_hardreset(u8 shift, u8 part, s16 inst,
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u16 rstctrl_offs)
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{
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u32 mask = 1 << shift;
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omap4_prminst_rmw_inst_reg_bits(mask, mask, part, inst, rstctrl_offs);
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return 0;
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}
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/**
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* omap4_prminst_deassert_hardreset - deassert a submodule hardreset line and
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* wait
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* @rstctrl_reg: RM_RSTCTRL register address for this module
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* @shift: register bit shift corresponding to the reset line to deassert
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*
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* Some IPs like dsp, ipu or iva contain processors that require an HW
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* reset line to be asserted / deasserted in order to fully enable the
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* IP. These modules may have multiple hard-reset lines that reset
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* different 'submodules' inside the IP block. This function will
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* take the submodule out of reset and wait until the PRCM indicates
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* that the reset has completed before returning. Returns 0 upon success or
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* -EINVAL upon an argument error, -EEXIST if the submodule was already out
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* of reset, or -EBUSY if the submodule did not exit reset promptly.
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*/
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int omap4_prminst_deassert_hardreset(u8 shift, u8 part, s16 inst,
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u16 rstctrl_offs)
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{
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int c;
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u32 mask = 1 << shift;
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u16 rstst_offs = rstctrl_offs + OMAP4_RST_CTRL_ST_OFFSET;
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/* Check the current status to avoid de-asserting the line twice */
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if (omap4_prminst_is_hardreset_asserted(shift, part, inst,
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rstctrl_offs) == 0)
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return -EEXIST;
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/* Clear the reset status by writing 1 to the status bit */
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omap4_prminst_rmw_inst_reg_bits(0xffffffff, mask, part, inst,
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rstst_offs);
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/* de-assert the reset control line */
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omap4_prminst_rmw_inst_reg_bits(mask, 0, part, inst, rstctrl_offs);
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/* wait the status to be set */
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omap_test_timeout(omap4_prminst_is_hardreset_asserted(shift, part, inst,
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rstst_offs),
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MAX_MODULE_HARDRESET_WAIT, c);
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return (c == MAX_MODULE_HARDRESET_WAIT) ? -EBUSY : 0;
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}
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void omap4_prminst_global_warm_sw_reset(void)
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{
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u32 v;
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s32 inst = omap4_prmst_get_prm_dev_inst();
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if (inst == PRM_INSTANCE_UNKNOWN)
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return;
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v = omap4_prminst_read_inst_reg(OMAP4430_PRM_PARTITION, inst,
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OMAP4_PRM_RSTCTRL_OFFSET);
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v |= OMAP4430_RST_GLOBAL_WARM_SW_MASK;
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omap4_prminst_write_inst_reg(v, OMAP4430_PRM_PARTITION,
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inst, OMAP4_PRM_RSTCTRL_OFFSET);
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/* OCP barrier */
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v = omap4_prminst_read_inst_reg(OMAP4430_PRM_PARTITION,
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inst, OMAP4_PRM_RSTCTRL_OFFSET);
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}
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