diff options
| -rw-r--r-- | arch/arm/mach-omap2/Makefile | 2 | ||||
| -rw-r--r-- | arch/arm/mach-omap2/prm.h | 5 | ||||
| -rw-r--r-- | arch/arm/mach-omap2/prm2xxx_3xxx.c | 110 |
3 files changed, 116 insertions, 1 deletions
diff --git a/arch/arm/mach-omap2/Makefile b/arch/arm/mach-omap2/Makefile index c0da784e6b28..eb2504a300c2 100644 --- a/arch/arm/mach-omap2/Makefile +++ b/arch/arm/mach-omap2/Makefile @@ -5,7 +5,7 @@ # Common support obj-y := id.o io.o control.o mux.o devices.o serial.o gpmc.o timer-gp.o pm.o -omap-2-3-common = irq.o sdrc.o +omap-2-3-common = irq.o sdrc.o prm2xxx_3xxx.o hwmod-common = omap_hwmod.o \ omap_hwmod_common_data.o prcm-common = prcm.o powerdomain.o diff --git a/arch/arm/mach-omap2/prm.h b/arch/arm/mach-omap2/prm.h index bc7e6e6099d5..7be040b2fdab 100644 --- a/arch/arm/mach-omap2/prm.h +++ b/arch/arm/mach-omap2/prm.h @@ -246,6 +246,11 @@ static inline u32 prm_clear_mod_reg_bits(u32 bits, s16 module, s16 idx) return prm_rmw_mod_reg_bits(bits, 0x0, module, idx); } +/* These omap2_ PRM functions apply to both OMAP2 and 3 */ +int omap2_prm_is_hardreset_asserted(s16 prm_mod, u8 shift); +int omap2_prm_assert_hardreset(s16 prm_mod, u8 shift); +int omap2_prm_deassert_hardreset(s16 prm_mod, u8 shift); + int omap4_prm_is_hardreset_asserted(void __iomem *rstctrl_reg, u8 shift); int omap4_prm_assert_hardreset(void __iomem *rstctrl_reg, u8 shift); int omap4_prm_deassert_hardreset(void __iomem *rstctrl_reg, u8 shift); diff --git a/arch/arm/mach-omap2/prm2xxx_3xxx.c b/arch/arm/mach-omap2/prm2xxx_3xxx.c new file mode 100644 index 000000000000..421771eee450 --- /dev/null +++ b/arch/arm/mach-omap2/prm2xxx_3xxx.c @@ -0,0 +1,110 @@ +/* + * OMAP2/3 PRM module functions + * + * Copyright (C) 2010 Texas Instruments, Inc. + * Copyright (C) 2010 Nokia Corporation + * Benoît Cousson + * 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/delay.h> +#include <linux/errno.h> +#include <linux/err.h> + +#include <plat/common.h> +#include <plat/cpu.h> +#include <plat/prcm.h> + +#include "prm.h" +#include "prm-regbits-24xx.h" +#include "prm-regbits-34xx.h" + +/** + * omap2_prm_is_hardreset_asserted - read the HW reset line state of + * submodules contained in the hwmod module + * @prm_mod: PRM submodule base (e.g. CORE_MOD) + * @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 if called while running on a non-OMAP2/3 chip. + */ +int omap2_prm_is_hardreset_asserted(s16 prm_mod, u8 shift) +{ + if (!(cpu_is_omap24xx() || cpu_is_omap34xx())) + return -EINVAL; + + return prm_read_mod_bits_shift(prm_mod, OMAP2_RM_RSTCTRL, + (1 << shift)); +} + +/** + * omap2_prm_assert_hardreset - assert the HW reset line of a submodule + * @prm_mod: PRM submodule base (e.g. CORE_MOD) + * @shift: register bit shift corresponding to the reset line to assert + * + * Some IPs like dsp 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 omap2_prm_assert_hardreset(s16 prm_mod, u8 shift) +{ + u32 mask; + + if (!(cpu_is_omap24xx() || cpu_is_omap34xx())) + return -EINVAL; + + mask = 1 << shift; + prm_rmw_mod_reg_bits(mask, mask, prm_mod, OMAP2_RM_RSTCTRL); + + return 0; +} + +/** + * omap2_prm_deassert_hardreset - deassert a submodule hardreset line and wait + * @prm_mod: PRM submodule base (e.g. CORE_MOD) + * @shift: register bit shift corresponding to the reset line to deassert + * + * Some IPs like dsp 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 omap2_prm_deassert_hardreset(s16 prm_mod, u8 shift) +{ + u32 mask; + int c; + + if (!(cpu_is_omap24xx() || cpu_is_omap34xx())) + return -EINVAL; + + mask = 1 << shift; + + /* Check the current status to avoid de-asserting the line twice */ + if (prm_read_mod_bits_shift(prm_mod, OMAP2_RM_RSTCTRL, mask) == 0) + return -EEXIST; + + /* Clear the reset status by writing 1 to the status bit */ + prm_rmw_mod_reg_bits(0xffffffff, mask, prm_mod, OMAP2_RM_RSTST); + /* de-assert the reset control line */ + prm_rmw_mod_reg_bits(mask, 0, prm_mod, OMAP2_RM_RSTCTRL); + /* wait the status to be set */ + omap_test_timeout(prm_read_mod_bits_shift(prm_mod, OMAP2_RM_RSTST, + mask), + MAX_MODULE_HARDRESET_WAIT, c); + + return (c == MAX_MODULE_HARDRESET_WAIT) ? -EBUSY : 0; +} + |