diff options
Diffstat (limited to 'kernel/arch/arm/mach-omap2/prm2xxx_3xxx.c')
| -rw-r--r-- | kernel/arch/arm/mach-omap2/prm2xxx_3xxx.c | 240 |
1 files changed, 240 insertions, 0 deletions
diff --git a/kernel/arch/arm/mach-omap2/prm2xxx_3xxx.c b/kernel/arch/arm/mach-omap2/prm2xxx_3xxx.c new file mode 100644 index 000000000..cc3341f26 --- /dev/null +++ b/kernel/arch/arm/mach-omap2/prm2xxx_3xxx.c @@ -0,0 +1,240 @@ +/* + * OMAP2/3 PRM module functions + * + * Copyright (C) 2010-2011 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/errno.h> +#include <linux/err.h> +#include <linux/io.h> + +#include "powerdomain.h" +#include "prm2xxx_3xxx.h" +#include "prm-regbits-24xx.h" +#include "clockdomain.h" + +/** + * omap2_prm_is_hardreset_asserted - read the HW reset line state of + * submodules contained in the hwmod module + * @shift: register bit shift corresponding to the reset line to check + * @part: PRM partition, ignored for OMAP2 + * @prm_mod: PRM submodule base (e.g. CORE_MOD) + * @offset: register offset, ignored for OMAP2 + * + * 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(u8 shift, u8 part, s16 prm_mod, u16 offset) +{ + return omap2_prm_read_mod_bits_shift(prm_mod, OMAP2_RM_RSTCTRL, + (1 << shift)); +} + +/** + * omap2_prm_assert_hardreset - assert the HW reset line of a submodule + * @shift: register bit shift corresponding to the reset line to assert + * @part: PRM partition, ignored for OMAP2 + * @prm_mod: PRM submodule base (e.g. CORE_MOD) + * @offset: register offset, ignored for OMAP2 + * + * 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(u8 shift, u8 part, s16 prm_mod, u16 offset) +{ + u32 mask; + + mask = 1 << shift; + omap2_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) + * @rst_shift: register bit shift corresponding to the reset line to deassert + * @st_shift: register bit shift for the status of the deasserted submodule + * @part: PRM partition, not used for OMAP2 + * @prm_mod: PRM submodule base (e.g. CORE_MOD) + * @rst_offset: reset register offset, not used for OMAP2 + * @st_offset: reset status register offset, not used for OMAP2 + * + * 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(u8 rst_shift, u8 st_shift, u8 part, + s16 prm_mod, u16 rst_offset, u16 st_offset) +{ + u32 rst, st; + int c; + + rst = 1 << rst_shift; + st = 1 << st_shift; + + /* Check the current status to avoid de-asserting the line twice */ + if (omap2_prm_read_mod_bits_shift(prm_mod, OMAP2_RM_RSTCTRL, rst) == 0) + return -EEXIST; + + /* Clear the reset status by writing 1 to the status bit */ + omap2_prm_rmw_mod_reg_bits(0xffffffff, st, prm_mod, OMAP2_RM_RSTST); + /* de-assert the reset control line */ + omap2_prm_rmw_mod_reg_bits(rst, 0, prm_mod, OMAP2_RM_RSTCTRL); + /* wait the status to be set */ + omap_test_timeout(omap2_prm_read_mod_bits_shift(prm_mod, OMAP2_RM_RSTST, + st), + MAX_MODULE_HARDRESET_WAIT, c); + + return (c == MAX_MODULE_HARDRESET_WAIT) ? -EBUSY : 0; +} + + +/* Powerdomain low-level functions */ + +/* Common functions across OMAP2 and OMAP3 */ +int omap2_pwrdm_set_mem_onst(struct powerdomain *pwrdm, u8 bank, + u8 pwrst) +{ + u32 m; + + m = omap2_pwrdm_get_mem_bank_onstate_mask(bank); + + omap2_prm_rmw_mod_reg_bits(m, (pwrst << __ffs(m)), pwrdm->prcm_offs, + OMAP2_PM_PWSTCTRL); + + return 0; +} + +int omap2_pwrdm_set_mem_retst(struct powerdomain *pwrdm, u8 bank, + u8 pwrst) +{ + u32 m; + + m = omap2_pwrdm_get_mem_bank_retst_mask(bank); + + omap2_prm_rmw_mod_reg_bits(m, (pwrst << __ffs(m)), pwrdm->prcm_offs, + OMAP2_PM_PWSTCTRL); + + return 0; +} + +int omap2_pwrdm_read_mem_pwrst(struct powerdomain *pwrdm, u8 bank) +{ + u32 m; + + m = omap2_pwrdm_get_mem_bank_stst_mask(bank); + + return omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs, OMAP2_PM_PWSTST, + m); +} + +int omap2_pwrdm_read_mem_retst(struct powerdomain *pwrdm, u8 bank) +{ + u32 m; + + m = omap2_pwrdm_get_mem_bank_retst_mask(bank); + + return omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs, + OMAP2_PM_PWSTCTRL, m); +} + +int omap2_pwrdm_set_logic_retst(struct powerdomain *pwrdm, u8 pwrst) +{ + u32 v; + + v = pwrst << __ffs(OMAP_LOGICRETSTATE_MASK); + omap2_prm_rmw_mod_reg_bits(OMAP_LOGICRETSTATE_MASK, v, pwrdm->prcm_offs, + OMAP2_PM_PWSTCTRL); + + return 0; +} + +int omap2_pwrdm_wait_transition(struct powerdomain *pwrdm) +{ + u32 c = 0; + + /* + * REVISIT: pwrdm_wait_transition() may be better implemented + * via a callback and a periodic timer check -- how long do we expect + * powerdomain transitions to take? + */ + + /* XXX Is this udelay() value meaningful? */ + while ((omap2_prm_read_mod_reg(pwrdm->prcm_offs, OMAP2_PM_PWSTST) & + OMAP_INTRANSITION_MASK) && + (c++ < PWRDM_TRANSITION_BAILOUT)) + udelay(1); + + if (c > PWRDM_TRANSITION_BAILOUT) { + pr_err("powerdomain: %s: waited too long to complete transition\n", + pwrdm->name); + return -EAGAIN; + } + + pr_debug("powerdomain: completed transition in %d loops\n", c); + + return 0; +} + +int omap2_clkdm_add_wkdep(struct clockdomain *clkdm1, + struct clockdomain *clkdm2) +{ + omap2_prm_set_mod_reg_bits((1 << clkdm2->dep_bit), + clkdm1->pwrdm.ptr->prcm_offs, PM_WKDEP); + return 0; +} + +int omap2_clkdm_del_wkdep(struct clockdomain *clkdm1, + struct clockdomain *clkdm2) +{ + omap2_prm_clear_mod_reg_bits((1 << clkdm2->dep_bit), + clkdm1->pwrdm.ptr->prcm_offs, PM_WKDEP); + return 0; +} + +int omap2_clkdm_read_wkdep(struct clockdomain *clkdm1, + struct clockdomain *clkdm2) +{ + return omap2_prm_read_mod_bits_shift(clkdm1->pwrdm.ptr->prcm_offs, + PM_WKDEP, (1 << clkdm2->dep_bit)); +} + +/* XXX Caller must hold the clkdm's powerdomain lock */ +int omap2_clkdm_clear_all_wkdeps(struct clockdomain *clkdm) +{ + struct clkdm_dep *cd; + u32 mask = 0; + + for (cd = clkdm->wkdep_srcs; cd && cd->clkdm_name; cd++) { + if (!cd->clkdm) + continue; /* only happens if data is erroneous */ + + /* PRM accesses are slow, so minimize them */ + mask |= 1 << cd->clkdm->dep_bit; + cd->wkdep_usecount = 0; + } + + omap2_prm_clear_mod_reg_bits(mask, clkdm->pwrdm.ptr->prcm_offs, + PM_WKDEP); + return 0; +} + |