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author | Vaibhav Hiremath <hvaibhav@ti.com> | 2012-06-18 00:47:27 -0600 |
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committer | Paul Walmsley <paul@pwsan.com> | 2012-06-18 12:08:06 -0600 |
commit | 3f0ea7645ae6d7111ebc3e83f47fbc0f2c8a8964 (patch) | |
tree | 6f000b859092336bcc27812e4b7022e200845817 /arch/arm/mach-omap2/powerdomain33xx.c | |
parent | f969a6dcec75fe997a156b904d4fbbb5b313e54f (diff) | |
download | linux-3f0ea7645ae6d7111ebc3e83f47fbc0f2c8a8964.tar.bz2 |
ARM: OMAP AM33xx: powerdomains: add AM335x support
Add offset & mask fields to struct powerdomain
In case of AM33xx family of devices, there is no consistency between
PWRSTCTRL & PWRSTST register offsers in PRM space, for example -
PRM_XXX PWRSTCTRL PWRSTST
=======================================
PRM_PER_MOD: 0x0C, 0x08
PRM_WKUP_MOD: 0x04, 0x08
PRM_MPU_MOD: 0x00, 0x04
PRM_DEVICE_MOD: NA, NA
And also, there is no consistency between bit-offsets inside
PWRSTCTRL & PWRSTST register, for example -
PRM_XXX LOGICRET MEMON MEMRET
=======================================
GFX_PWRCTRL: 2, 17, 6
PER_PWRCTRL: 3, 25, 29
MPU_PWRCTRL: 2, 18, 22
WKUP_PWRCTRL: 3, NA, NA
This means, we need to maintain and pass on all this information
in powerdomain handle; so adding fields for,
- PWRSTCTRL/ST register offset
- Logic retention state mask
- mem_on/ret/pwrst/retst mask
Currently, this fields is only applicable and used for AM33XX devices.
Signed-off-by: Vaibhav Hiremath <hvaibhav@ti.com>
Cc: Benoit Cousson <b-cousson@ti.com>
Cc: Tony Lindgren <tony@atomide.com>
Cc: Kevin Hilman <khilman@ti.com>
Cc: Paul Walmsley <paul@pwsan.com>
Cc: Rajendra Nayak <rnayak@ti.com>
[paul@pwsan.com: this patch is a combination of "Add offset & mask fields to
struct powerdomain" and the powerdomain portions of "ARM: OMAP3+: am33xx:
Add powerdomain & PRM support"; updated for 3.5]
Signed-off-by: Paul Walmsley <paul@pwsan.com>
Diffstat (limited to 'arch/arm/mach-omap2/powerdomain33xx.c')
-rw-r--r-- | arch/arm/mach-omap2/powerdomain33xx.c | 229 |
1 files changed, 229 insertions, 0 deletions
diff --git a/arch/arm/mach-omap2/powerdomain33xx.c b/arch/arm/mach-omap2/powerdomain33xx.c new file mode 100644 index 000000000000..67c5663899b6 --- /dev/null +++ b/arch/arm/mach-omap2/powerdomain33xx.c @@ -0,0 +1,229 @@ +/* + * AM33XX Powerdomain control + * + * Copyright (C) 2011-2012 Texas Instruments Incorporated - http://www.ti.com/ + * + * Derived from mach-omap2/powerdomain44xx.c written by 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 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 <linux/io.h> +#include <linux/errno.h> +#include <linux/delay.h> + +#include <plat/prcm.h> + +#include "powerdomain.h" +#include "prm33xx.h" +#include "prm-regbits-33xx.h" + + +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_read_prev_pwrst(struct powerdomain *pwrdm) +{ + u32 v; + + v = am33xx_prm_read_reg(pwrdm->prcm_offs, pwrdm->pwrstst_offs); + v &= AM33XX_LASTPOWERSTATEENTERED_MASK; + v >>= AM33XX_LASTPOWERSTATEENTERED_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; +} + +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_read_prev_pwrst = am33xx_pwrdm_read_prev_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, +}; |