| /* |
| * OMAP4 powerdomain control |
| * |
| * Copyright (C) 2009-2010 Texas Instruments, Inc. |
| * Copyright (C) 2007-2009 Nokia Corporation |
| * |
| * Derived from mach-omap2/powerdomain.c written by Paul Walmsley |
| * Rajendra Nayak <rnayak@ti.com> |
| * |
| * 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/io.h> |
| #include <linux/errno.h> |
| #include <linux/delay.h> |
| #include <plat/powerdomain.h> |
| #include <plat/prcm.h> |
| #include "prm.h" |
| #include "prm-regbits-44xx.h" |
| #include "powerdomains.h" |
| |
| static int omap4_pwrdm_set_next_pwrst(struct powerdomain *pwrdm, u8 pwrst) |
| { |
| prm_rmw_mod_reg_bits(OMAP_POWERSTATE_MASK, |
| (pwrst << OMAP_POWERSTATE_SHIFT), |
| pwrdm->prcm_offs, OMAP4_PM_PWSTCTRL); |
| return 0; |
| } |
| |
| static int omap4_pwrdm_read_next_pwrst(struct powerdomain *pwrdm) |
| { |
| return prm_read_mod_bits_shift(pwrdm->prcm_offs, |
| OMAP4_PM_PWSTCTRL, OMAP_POWERSTATE_MASK); |
| } |
| |
| static int omap4_pwrdm_read_pwrst(struct powerdomain *pwrdm) |
| { |
| return prm_read_mod_bits_shift(pwrdm->prcm_offs, |
| OMAP4_PM_PWSTST, OMAP_POWERSTATEST_MASK); |
| } |
| |
| static int omap4_pwrdm_read_prev_pwrst(struct powerdomain *pwrdm) |
| { |
| return prm_read_mod_bits_shift(pwrdm->prcm_offs, OMAP4_PM_PWSTST, |
| OMAP4430_LASTPOWERSTATEENTERED_MASK); |
| } |
| |
| static int omap4_pwrdm_set_lowpwrstchange(struct powerdomain *pwrdm) |
| { |
| prm_rmw_mod_reg_bits(OMAP4430_LOWPOWERSTATECHANGE_MASK, |
| (1 << OMAP4430_LOWPOWERSTATECHANGE_SHIFT), |
| pwrdm->prcm_offs, OMAP4_PM_PWSTCTRL); |
| return 0; |
| } |
| |
| static int omap4_pwrdm_clear_all_prev_pwrst(struct powerdomain *pwrdm) |
| { |
| prm_rmw_mod_reg_bits(OMAP4430_LASTPOWERSTATEENTERED_MASK, |
| OMAP4430_LASTPOWERSTATEENTERED_MASK, |
| pwrdm->prcm_offs, OMAP4_PM_PWSTST); |
| return 0; |
| } |
| |
| static int omap4_pwrdm_set_logic_retst(struct powerdomain *pwrdm, u8 pwrst) |
| { |
| u32 v; |
| |
| v = pwrst << __ffs(OMAP4430_LOGICRETSTATE_MASK); |
| prm_rmw_mod_reg_bits(OMAP4430_LOGICRETSTATE_MASK, v, |
| pwrdm->prcm_offs, OMAP4_PM_PWSTCTRL); |
| |
| return 0; |
| } |
| |
| static int omap4_pwrdm_set_mem_onst(struct powerdomain *pwrdm, u8 bank, |
| u8 pwrst) |
| { |
| u32 m; |
| |
| m = omap2_pwrdm_get_mem_bank_onstate_mask(bank); |
| |
| prm_rmw_mod_reg_bits(m, (pwrst << __ffs(m)), pwrdm->prcm_offs, |
| OMAP4_PM_PWSTCTRL); |
| |
| return 0; |
| } |
| |
| static int omap4_pwrdm_set_mem_retst(struct powerdomain *pwrdm, u8 bank, |
| u8 pwrst) |
| { |
| u32 m; |
| |
| m = omap2_pwrdm_get_mem_bank_retst_mask(bank); |
| |
| prm_rmw_mod_reg_bits(m, (pwrst << __ffs(m)), pwrdm->prcm_offs, |
| OMAP4_PM_PWSTCTRL); |
| |
| return 0; |
| } |
| |
| static int omap4_pwrdm_read_logic_pwrst(struct powerdomain *pwrdm) |
| { |
| return prm_read_mod_bits_shift(pwrdm->prcm_offs, OMAP4_PM_PWSTST, |
| OMAP4430_LOGICSTATEST_MASK); |
| } |
| |
| static int omap4_pwrdm_read_logic_retst(struct powerdomain *pwrdm) |
| { |
| return prm_read_mod_bits_shift(pwrdm->prcm_offs, OMAP4_PM_PWSTCTRL, |
| OMAP4430_LOGICRETSTATE_MASK); |
| } |
| |
| static int omap4_pwrdm_read_mem_pwrst(struct powerdomain *pwrdm, u8 bank) |
| { |
| u32 m; |
| |
| m = omap2_pwrdm_get_mem_bank_stst_mask(bank); |
| |
| return prm_read_mod_bits_shift(pwrdm->prcm_offs, OMAP4_PM_PWSTST, m); |
| } |
| |
| static int omap4_pwrdm_read_mem_retst(struct powerdomain *pwrdm, u8 bank) |
| { |
| u32 m; |
| |
| m = omap2_pwrdm_get_mem_bank_retst_mask(bank); |
| |
| return prm_read_mod_bits_shift(pwrdm->prcm_offs, OMAP4_PM_PWSTCTRL, m); |
| } |
| |
| static int omap4_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 ((prm_read_mod_reg(pwrdm->prcm_offs, OMAP4_PM_PWSTST) & |
| OMAP_INTRANSITION_MASK) && |
| (c++ < PWRDM_TRANSITION_BAILOUT)) |
| udelay(1); |
| |
| if (c > PWRDM_TRANSITION_BAILOUT) { |
| printk(KERN_ERR "powerdomain: waited too long for " |
| "powerdomain %s to complete transition\n", pwrdm->name); |
| return -EAGAIN; |
| } |
| |
| pr_debug("powerdomain: completed transition in %d loops\n", c); |
| |
| return 0; |
| } |
| |
| struct pwrdm_ops omap4_pwrdm_operations = { |
| .pwrdm_set_next_pwrst = omap4_pwrdm_set_next_pwrst, |
| .pwrdm_read_next_pwrst = omap4_pwrdm_read_next_pwrst, |
| .pwrdm_read_pwrst = omap4_pwrdm_read_pwrst, |
| .pwrdm_read_prev_pwrst = omap4_pwrdm_read_prev_pwrst, |
| .pwrdm_set_lowpwrstchange = omap4_pwrdm_set_lowpwrstchange, |
| .pwrdm_clear_all_prev_pwrst = omap4_pwrdm_clear_all_prev_pwrst, |
| .pwrdm_set_logic_retst = omap4_pwrdm_set_logic_retst, |
| .pwrdm_read_logic_pwrst = omap4_pwrdm_read_logic_pwrst, |
| .pwrdm_read_logic_retst = omap4_pwrdm_read_logic_retst, |
| .pwrdm_read_mem_pwrst = omap4_pwrdm_read_mem_pwrst, |
| .pwrdm_read_mem_retst = omap4_pwrdm_read_mem_retst, |
| .pwrdm_set_mem_onst = omap4_pwrdm_set_mem_onst, |
| .pwrdm_set_mem_retst = omap4_pwrdm_set_mem_retst, |
| .pwrdm_wait_transition = omap4_pwrdm_wait_transition, |
| }; |