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| author | Paul Walmsley <paul@pwsan.com> | 2012-12-28 10:10:44 +0100 |
|---|---|---|
| committer | Paul Walmsley <paul@pwsan.com> | 2013-01-02 20:07:16 +0100 |
| commit | 7e7fff8254e318cede06a1a8c55b0d86dd4d8c5b (patch) | |
| tree | 38ad0446026932ed55ae1af167dae17c0a417f3a /arch/arm/mach-omap2/prm3xxx.c | |
| parent | ARM: OMAP3: clock data: Add missing enable/disable for EMU clock (diff) | |
| download | linux-7e7fff8254e318cede06a1a8c55b0d86dd4d8c5b.tar.xz linux-7e7fff8254e318cede06a1a8c55b0d86dd4d8c5b.zip | |
ARM: OMAP2/3: PRM: fix bogus OMAP2xxx powerstate return values
On OMAP2xxx chips, the register bitfields for the
PM_PWSTCTRL_*.POWERSTATE and PM_PWSTST_*.LASTSTATEENTERED are
different than those used on OMAP3/4. The order is reversed. So, for
example, on OMAP2xxx, 0x0 indicates 'ON'; but on OMAP3/4, 0x0
indicates 'OFF'. Similarly, on OMAP2xxx, 0x3 indicates 'OFF', but on
OMAP3/4, 0x3 indicates 'ON'.
To fix this, we treat the OMAP3/4 values as the powerdomain API
values, and create new low-level powerdomain functions for the
OMAP2xxx chips which translate between the OMAP2xxx values and the
OMAP3/4 values.
Without this patch, the conversion of the OMAP2xxx PM code to the
functional powerstate code results in a non-booting kernel.
Signed-off-by: Paul Walmsley <paul@pwsan.com>
Diffstat (limited to 'arch/arm/mach-omap2/prm3xxx.c')
| -rw-r--r-- | arch/arm/mach-omap2/prm3xxx.c | 28 |
1 files changed, 25 insertions, 3 deletions
diff --git a/arch/arm/mach-omap2/prm3xxx.c b/arch/arm/mach-omap2/prm3xxx.c index db198d058584..4d43474d7455 100644 --- a/arch/arm/mach-omap2/prm3xxx.c +++ b/arch/arm/mach-omap2/prm3xxx.c @@ -278,6 +278,28 @@ static u32 omap3xxx_prm_read_reset_sources(void) /* Powerdomain low-level functions */ +static int omap3_pwrdm_set_next_pwrst(struct powerdomain *pwrdm, u8 pwrst) +{ + omap2_prm_rmw_mod_reg_bits(OMAP_POWERSTATE_MASK, + (pwrst << OMAP_POWERSTATE_SHIFT), + pwrdm->prcm_offs, OMAP2_PM_PWSTCTRL); + return 0; +} + +static int omap3_pwrdm_read_next_pwrst(struct powerdomain *pwrdm) +{ + return omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs, + OMAP2_PM_PWSTCTRL, + OMAP_POWERSTATE_MASK); +} + +static int omap3_pwrdm_read_pwrst(struct powerdomain *pwrdm) +{ + return omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs, + OMAP2_PM_PWSTST, + OMAP_POWERSTATEST_MASK); +} + /* Applicable only for OMAP3. Not supported on OMAP2 */ static int omap3_pwrdm_read_prev_pwrst(struct powerdomain *pwrdm) { @@ -356,9 +378,9 @@ static int omap3_pwrdm_disable_hdwr_sar(struct powerdomain *pwrdm) } struct pwrdm_ops omap3_pwrdm_operations = { - .pwrdm_set_next_pwrst = omap2_pwrdm_set_next_pwrst, - .pwrdm_read_next_pwrst = omap2_pwrdm_read_next_pwrst, - .pwrdm_read_pwrst = omap2_pwrdm_read_pwrst, + .pwrdm_set_next_pwrst = omap3_pwrdm_set_next_pwrst, + .pwrdm_read_next_pwrst = omap3_pwrdm_read_next_pwrst, + .pwrdm_read_pwrst = omap3_pwrdm_read_pwrst, .pwrdm_read_prev_pwrst = omap3_pwrdm_read_prev_pwrst, .pwrdm_set_logic_retst = omap2_pwrdm_set_logic_retst, .pwrdm_read_logic_pwrst = omap3_pwrdm_read_logic_pwrst, |