/* * AM33XX PRM functions * * Copyright (C) 2011-2012 Texas Instruments Incorporated - http://www.ti.com/ * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation version 2. * * This program is distributed "as is" WITHOUT ANY WARRANTY of any * kind, whether express or implied; without even the implied warranty * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. */ #include #include #include #include #include #include "powerdomain.h" #include "prm33xx.h" #include "prm-regbits-33xx.h" #define AM33XX_PRM_RSTCTRL_OFFSET 0x0000 #define AM33XX_RST_GLOBAL_WARM_SW_MASK (1 << 0) /* Read a register in a PRM instance */ static u32 am33xx_prm_read_reg(s16 inst, u16 idx) { return readl_relaxed(prm_base.va + inst + idx); } /* Write into a register in a PRM instance */ static void am33xx_prm_write_reg(u32 val, s16 inst, u16 idx) { writel_relaxed(val, prm_base.va + inst + idx); } /* Read-modify-write a register in PRM. Caller must lock */ static u32 am33xx_prm_rmw_reg_bits(u32 mask, u32 bits, s16 inst, s16 idx) { u32 v; v = am33xx_prm_read_reg(inst, idx); v &= ~mask; v |= bits; am33xx_prm_write_reg(v, inst, idx); return v; } /** * am33xx_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 AM33xx * @inst: CM instance register offset (*_INST macro) * @rstctrl_offs: RM_RSTCTRL register address offset for this module * * 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. */ static int am33xx_prm_is_hardreset_asserted(u8 shift, u8 part, s16 inst, u16 rstctrl_offs) { u32 v; v = am33xx_prm_read_reg(inst, rstctrl_offs); v &= 1 << shift; v >>= shift; return v; } /** * am33xx_prm_assert_hardreset - assert the HW reset line of a submodule * @shift: register bit shift corresponding to the reset line to assert * @part: CM partition, ignored for AM33xx * @inst: CM instance register offset (*_INST macro) * @rstctrl_reg: RM_RSTCTRL register address for this module * * 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. */ static int am33xx_prm_assert_hardreset(u8 shift, u8 part, s16 inst, u16 rstctrl_offs) { u32 mask = 1 << shift; am33xx_prm_rmw_reg_bits(mask, mask, inst, rstctrl_offs); return 0; } /** * am33xx_prm_deassert_hardreset - deassert a submodule hardreset line and * wait * @shift: register bit shift corresponding to the reset line to deassert * @st_shift: reset status register bit shift corresponding to the reset line * @part: PRM partition, not used for AM33xx * @inst: CM instance register offset (*_INST macro) * @rstctrl_reg: RM_RSTCTRL register address for this module * @rstst_reg: RM_RSTST register address for this module * * 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. */ static int am33xx_prm_deassert_hardreset(u8 shift, u8 st_shift, u8 part, s16 inst, u16 rstctrl_offs, u16 rstst_offs) { int c; u32 mask = 1 << st_shift; /* Check the current status to avoid de-asserting the line twice */ if (am33xx_prm_is_hardreset_asserted(shift, 0, inst, rstctrl_offs) == 0) return -EEXIST; /* Clear the reset status by writing 1 to the status bit */ am33xx_prm_rmw_reg_bits(0xffffffff, mask, inst, rstst_offs); /* de-assert the reset control line */ mask = 1 << shift; am33xx_prm_rmw_reg_bits(mask, 0, inst, rstctrl_offs); /* wait the status to be set */ omap_test_timeout(am33xx_prm_is_hardreset_asserted(st_shift, 0, inst, rstst_offs), MAX_MODULE_HARDRESET_WAIT, c); return (c == MAX_MODULE_HARDRESET_WAIT) ? -EBUSY : 0; } static int am33xx_pwrdm_set_next_pwrst(struct powerdomain *pwrdm, u8 pwrst) { am33xx_prm_rmw_reg_bits(OMAP_POWERSTATE_MASK, (pwrst << OMAP_POWERSTATE_SHIFT), pwrdm->prcm_offs, pwrdm->pwrstctrl_offs); return 0; } static int am33xx_pwrdm_read_next_pwrst(struct powerdomain *pwrdm) { u32 v; v = am33xx_prm_read_reg(pwrdm->prcm_offs, pwrdm->pwrstctrl_offs); v &= OMAP_POWERSTATE_MASK; v >>= OMAP_POWERSTATE_SHIFT; return v; } static int am33xx_pwrdm_read_pwrst(struct powerdomain *pwrdm) { u32 v; v = am33xx_prm_read_reg(pwrdm->prcm_offs, pwrdm->pwrstst_offs); v &= OMAP_POWERSTATEST_MASK; v >>= OMAP_POWERSTATEST_SHIFT; return v; } static int am33xx_pwrdm_set_lowpwrstchange(struct powerdomain *pwrdm) { am33xx_prm_rmw_reg_bits(AM33XX_LOWPOWERSTATECHANGE_MASK, (1 << AM33XX_LOWPOWERSTATECHANGE_SHIFT), pwrdm->prcm_offs, pwrdm->pwrstctrl_offs); return 0; } static int am33xx_pwrdm_clear_all_prev_pwrst(struct powerdomain *pwrdm) { am33xx_prm_rmw_reg_bits(AM33XX_LASTPOWERSTATEENTERED_MASK, AM33XX_LASTPOWERSTATEENTERED_MASK, pwrdm->prcm_offs, pwrdm->pwrstst_offs); return 0; } static int am33xx_pwrdm_set_logic_retst(struct powerdomain *pwrdm, u8 pwrst) { u32 m; m = pwrdm->logicretstate_mask; if (!m) return -EINVAL; am33xx_prm_rmw_reg_bits(m, (pwrst << __ffs(m)), pwrdm->prcm_offs, pwrdm->pwrstctrl_offs); return 0; } static int am33xx_pwrdm_read_logic_pwrst(struct powerdomain *pwrdm) { u32 v; v = am33xx_prm_read_reg(pwrdm->prcm_offs, pwrdm->pwrstst_offs); v &= AM33XX_LOGICSTATEST_MASK; v >>= AM33XX_LOGICSTATEST_SHIFT; return v; } static int am33xx_pwrdm_read_logic_retst(struct powerdomain *pwrdm) { u32 v, m; m = pwrdm->logicretstate_mask; if (!m) return -EINVAL; v = am33xx_prm_read_reg(pwrdm->prcm_offs, pwrdm->pwrstctrl_offs); v &= m; v >>= __ffs(m); return v; } static int am33xx_pwrdm_set_mem_onst(struct powerdomain *pwrdm, u8 bank, u8 pwrst) { u32 m; m = pwrdm->mem_on_mask[bank]; if (!m) return -EINVAL; am33xx_prm_rmw_reg_bits(m, (pwrst << __ffs(m)), pwrdm->prcm_offs, pwrdm->pwrstctrl_offs); return 0; } static int am33xx_pwrdm_set_mem_retst(struct powerdomain *pwrdm, u8 bank, u8 pwrst) { u32 m; m = pwrdm->mem_ret_mask[bank]; if (!m) return -EINVAL; am33xx_prm_rmw_reg_bits(m, (pwrst << __ffs(m)), pwrdm->prcm_offs, pwrdm->pwrstctrl_offs); return 0; } static int am33xx_pwrdm_read_mem_pwrst(struct powerdomain *pwrdm, u8 bank) { u32 m, v; m = pwrdm->mem_pwrst_mask[bank]; if (!m) return -EINVAL; v = am33xx_prm_read_reg(pwrdm->prcm_offs, pwrdm->pwrstst_offs); v &= m; v >>= __ffs(m); return v; } static int am33xx_pwrdm_read_mem_retst(struct powerdomain *pwrdm, u8 bank) { u32 m, v; m = pwrdm->mem_retst_mask[bank]; if (!m) return -EINVAL; v = am33xx_prm_read_reg(pwrdm->prcm_offs, pwrdm->pwrstctrl_offs); v &= m; v >>= __ffs(m); return v; } static int am33xx_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 ((am33xx_prm_read_reg(pwrdm->prcm_offs, pwrdm->pwrstst_offs) & 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; } static int am33xx_check_vcvp(void) { /* No VC/VP on am33xx devices */ return 0; } /** * am33xx_prm_global_warm_sw_reset - reboot the device via warm reset * * Immediately reboots the device through warm reset. */ static void am33xx_prm_global_warm_sw_reset(void) { am33xx_prm_rmw_reg_bits(AM33XX_RST_GLOBAL_WARM_SW_MASK, AM33XX_RST_GLOBAL_WARM_SW_MASK, AM33XX_PRM_DEVICE_MOD, AM33XX_PRM_RSTCTRL_OFFSET); /* OCP barrier */ (void)am33xx_prm_read_reg(AM33XX_PRM_DEVICE_MOD, AM33XX_PRM_RSTCTRL_OFFSET); } static void am33xx_pwrdm_save_context(struct powerdomain *pwrdm) { pwrdm->context = am33xx_prm_read_reg(pwrdm->prcm_offs, pwrdm->pwrstctrl_offs); /* * Do not save LOWPOWERSTATECHANGE, writing a 1 indicates a request, * reading back a 1 indicates a request in progress. */ pwrdm->context &= ~AM33XX_LOWPOWERSTATECHANGE_MASK; } static void am33xx_pwrdm_restore_context(struct powerdomain *pwrdm) { int st, ctrl; st = am33xx_prm_read_reg(pwrdm->prcm_offs, pwrdm->pwrstst_offs); am33xx_prm_write_reg(pwrdm->context, pwrdm->prcm_offs, pwrdm->pwrstctrl_offs); /* Make sure we only wait for a transition if there is one */ st &= OMAP_POWERSTATEST_MASK; ctrl = OMAP_POWERSTATEST_MASK & pwrdm->context; if (st != ctrl) am33xx_pwrdm_wait_transition(pwrdm); } struct pwrdm_ops am33xx_pwrdm_operations = { .pwrdm_set_next_pwrst = am33xx_pwrdm_set_next_pwrst, .pwrdm_read_next_pwrst = am33xx_pwrdm_read_next_pwrst, .pwrdm_read_pwrst = am33xx_pwrdm_read_pwrst, .pwrdm_set_logic_retst = am33xx_pwrdm_set_logic_retst, .pwrdm_read_logic_pwrst = am33xx_pwrdm_read_logic_pwrst, .pwrdm_read_logic_retst = am33xx_pwrdm_read_logic_retst, .pwrdm_clear_all_prev_pwrst = am33xx_pwrdm_clear_all_prev_pwrst, .pwrdm_set_lowpwrstchange = am33xx_pwrdm_set_lowpwrstchange, .pwrdm_read_mem_pwrst = am33xx_pwrdm_read_mem_pwrst, .pwrdm_read_mem_retst = am33xx_pwrdm_read_mem_retst, .pwrdm_set_mem_onst = am33xx_pwrdm_set_mem_onst, .pwrdm_set_mem_retst = am33xx_pwrdm_set_mem_retst, .pwrdm_wait_transition = am33xx_pwrdm_wait_transition, .pwrdm_has_voltdm = am33xx_check_vcvp, .pwrdm_save_context = am33xx_pwrdm_save_context, .pwrdm_restore_context = am33xx_pwrdm_restore_context, }; static struct prm_ll_data am33xx_prm_ll_data = { .assert_hardreset = am33xx_prm_assert_hardreset, .deassert_hardreset = am33xx_prm_deassert_hardreset, .is_hardreset_asserted = am33xx_prm_is_hardreset_asserted, .reset_system = am33xx_prm_global_warm_sw_reset, }; int __init am33xx_prm_init(const struct omap_prcm_init_data *data) { return prm_register(&am33xx_prm_ll_data); } static void __exit am33xx_prm_exit(void) { prm_unregister(&am33xx_prm_ll_data); } __exitcall(am33xx_prm_exit);