diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2011-07-26 17:42:18 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-07-26 17:42:18 -0700 |
commit | b0189cd087aa82bd23277cb5c8960ab030e13e5c (patch) | |
tree | 7b1a4c152cd62ce136fd5b0e4379d58eb2244e66 /arch/arm/mach-omap2/prminst44xx.c | |
parent | 69f1d1a6acbaa7d83ef3f4ee26209c58cd000204 (diff) | |
parent | bc574e190d3fbed37d724e33a16aee326d6f2ac4 (diff) |
Merge branch 'next/devel2' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/linux-arm-soc
* 'next/devel2' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/linux-arm-soc: (47 commits)
OMAP: Add debugfs node to show the summary of all clocks
OMAP2+: hwmod: Follow the recommended PRCM module enable sequence
OMAP2+: clock: allow per-SoC clock init code to prevent clockdomain calls from clock code
OMAP2+: clockdomain: Add per clkdm lock to prevent concurrent state programming
OMAP2+: PM: idle clkdms only if already in idle
OMAP2+: clockdomain: add clkdm_in_hwsup()
OMAP2+: clockdomain: Add 2 APIs to control clockdomain from hwmod framework
OMAP: clockdomain: Remove redundant call to pwrdm_wait_transition()
OMAP4: hwmod: Introduce the module control in hwmod control
OMAP4: cm: Add two new APIs for modulemode control
OMAP4: hwmod data: Add modulemode entry in omap_hwmod structure
OMAP4: hwmod data: Add PRM context register offset
OMAP4: prm: Remove deprecated functions
OMAP4: prm: Replace warm reset API with the offset based version
OMAP4: hwmod: Replace RSTCTRL absolute address with offset macros
OMAP: hwmod: Wait the idle status to be disabled
OMAP4: hwmod: Replace CLKCTRL absolute address with offset macros
OMAP2+: hwmod: Init clkdm field at boot time
OMAP4: hwmod data: Add clock domain attribute
OMAP4: clock data: Add missing divider selection for auxclks
...
Diffstat (limited to 'arch/arm/mach-omap2/prminst44xx.c')
-rw-r--r-- | arch/arm/mach-omap2/prminst44xx.c | 112 |
1 files changed, 111 insertions, 1 deletions
diff --git a/arch/arm/mach-omap2/prminst44xx.c b/arch/arm/mach-omap2/prminst44xx.c index a3032429727..3a7bab16edd 100644 --- a/arch/arm/mach-omap2/prminst44xx.c +++ b/arch/arm/mach-omap2/prminst44xx.c @@ -2,6 +2,7 @@ * 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 @@ -53,7 +54,7 @@ void omap4_prminst_write_inst_reg(u32 val, u8 part, s16 inst, u16 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, - s16 idx) + u16 idx) { u32 v; @@ -64,3 +65,112 @@ u32 omap4_prminst_rmw_inst_reg_bits(u32 mask, u32 bits, u8 part, s16 inst, return v; } + +/* + * Address offset (in bytes) between the reset control and the reset + * status registers: 4 bytes on OMAP4 + */ +#define OMAP4_RST_CTRL_ST_OFFSET 4 + +/** + * 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 + * @rstctrl_reg: RM_RSTCTRL register address for this module + * @shift: register bit shift corresponding to the reset line to deassert + * + * 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 part, s16 inst, + u16 rstctrl_offs) +{ + int c; + u32 mask = 1 << shift; + u16 rstst_offs = rstctrl_offs + OMAP4_RST_CTRL_ST_OFFSET; + + /* 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, 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(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; + + v = omap4_prminst_read_inst_reg(OMAP4430_PRM_PARTITION, + OMAP4430_PRM_DEVICE_INST, + OMAP4_PRM_RSTCTRL_OFFSET); + v |= OMAP4430_RST_GLOBAL_WARM_SW_MASK; + omap4_prminst_write_inst_reg(v, OMAP4430_PRM_PARTITION, + OMAP4430_PRM_DEVICE_INST, + OMAP4_PRM_RSTCTRL_OFFSET); + + /* OCP barrier */ + v = omap4_prminst_read_inst_reg(OMAP4430_PRM_PARTITION, + OMAP4430_PRM_DEVICE_INST, + OMAP4_PRM_RSTCTRL_OFFSET); +} |