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authorPaul Walmsley <paul@pwsan.com>2012-12-28 02:10:44 -0700
committerPaul Walmsley <paul@pwsan.com>2013-01-02 12:07:16 -0700
commit7e7fff8254e318cede06a1a8c55b0d86dd4d8c5b (patch)
tree38ad0446026932ed55ae1af167dae17c0a417f3a /arch
parentcfef4b2723d525a6588c4c55b42f9b98be27937f (diff)
downloadblackbird-op-linux-7e7fff8254e318cede06a1a8c55b0d86dd4d8c5b.tar.gz
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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')
-rw-r--r--arch/arm/mach-omap2/prm2xxx.c88
-rw-r--r--arch/arm/mach-omap2/prm2xxx_3xxx.c22
-rw-r--r--arch/arm/mach-omap2/prm3xxx.c28
3 files changed, 110 insertions, 28 deletions
diff --git a/arch/arm/mach-omap2/prm2xxx.c b/arch/arm/mach-omap2/prm2xxx.c
index faeab18696df..00cd4fcbda0f 100644
--- a/arch/arm/mach-omap2/prm2xxx.c
+++ b/arch/arm/mach-omap2/prm2xxx.c
@@ -29,6 +29,14 @@
#include "prm-regbits-24xx.h"
/*
+ * OMAP24xx PM_PWSTCTRL_*.POWERSTATE and PM_PWSTST_*.LASTSTATEENTERED bits -
+ * these are reversed from the bits used on OMAP3+
+ */
+#define OMAP24XX_PWRDM_POWER_ON 0x0
+#define OMAP24XX_PWRDM_POWER_RET 0x1
+#define OMAP24XX_PWRDM_POWER_OFF 0x3
+
+/*
* omap2xxx_prm_reset_src_map - map from bits in the PRM_RSTST_WKUP
* hardware register (which are specific to the OMAP2xxx SoCs) to
* reset source ID bit shifts (which is an OMAP SoC-independent
@@ -69,6 +77,34 @@ static u32 omap2xxx_prm_read_reset_sources(void)
}
/**
+ * omap2xxx_pwrst_to_common_pwrst - convert OMAP2xxx pwrst to common pwrst
+ * @omap2xxx_pwrst: OMAP2xxx hardware power state to convert
+ *
+ * Return the common power state bits corresponding to the OMAP2xxx
+ * hardware power state bits @omap2xxx_pwrst, or -EINVAL upon error.
+ */
+static int omap2xxx_pwrst_to_common_pwrst(u8 omap2xxx_pwrst)
+{
+ u8 pwrst;
+
+ switch (omap2xxx_pwrst) {
+ case OMAP24XX_PWRDM_POWER_OFF:
+ pwrst = PWRDM_POWER_OFF;
+ break;
+ case OMAP24XX_PWRDM_POWER_RET:
+ pwrst = PWRDM_POWER_RET;
+ break;
+ case OMAP24XX_PWRDM_POWER_ON:
+ pwrst = PWRDM_POWER_ON;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return pwrst;
+}
+
+/**
* omap2xxx_prm_dpll_reset - use DPLL reset to reboot the OMAP SoC
*
* Set the DPLL reset bit, which should reboot the SoC. This is the
@@ -98,10 +134,56 @@ int omap2xxx_clkdm_wakeup(struct clockdomain *clkdm)
return 0;
}
+static int omap2xxx_pwrdm_set_next_pwrst(struct powerdomain *pwrdm, u8 pwrst)
+{
+ u8 omap24xx_pwrst;
+
+ switch (pwrst) {
+ case PWRDM_POWER_OFF:
+ omap24xx_pwrst = OMAP24XX_PWRDM_POWER_OFF;
+ break;
+ case PWRDM_POWER_RET:
+ omap24xx_pwrst = OMAP24XX_PWRDM_POWER_RET;
+ break;
+ case PWRDM_POWER_ON:
+ omap24xx_pwrst = OMAP24XX_PWRDM_POWER_ON;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ omap2_prm_rmw_mod_reg_bits(OMAP_POWERSTATE_MASK,
+ (omap24xx_pwrst << OMAP_POWERSTATE_SHIFT),
+ pwrdm->prcm_offs, OMAP2_PM_PWSTCTRL);
+ return 0;
+}
+
+static int omap2xxx_pwrdm_read_next_pwrst(struct powerdomain *pwrdm)
+{
+ u8 omap2xxx_pwrst;
+
+ omap2xxx_pwrst = omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs,
+ OMAP2_PM_PWSTCTRL,
+ OMAP_POWERSTATE_MASK);
+
+ return omap2xxx_pwrst_to_common_pwrst(omap2xxx_pwrst);
+}
+
+static int omap2xxx_pwrdm_read_pwrst(struct powerdomain *pwrdm)
+{
+ u8 omap2xxx_pwrst;
+
+ omap2xxx_pwrst = omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs,
+ OMAP2_PM_PWSTST,
+ OMAP_POWERSTATEST_MASK);
+
+ return omap2xxx_pwrst_to_common_pwrst(omap2xxx_pwrst);
+}
+
struct pwrdm_ops omap2_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 = omap2xxx_pwrdm_set_next_pwrst,
+ .pwrdm_read_next_pwrst = omap2xxx_pwrdm_read_next_pwrst,
+ .pwrdm_read_pwrst = omap2xxx_pwrdm_read_pwrst,
.pwrdm_set_logic_retst = omap2_pwrdm_set_logic_retst,
.pwrdm_set_mem_onst = omap2_pwrdm_set_mem_onst,
.pwrdm_set_mem_retst = omap2_pwrdm_set_mem_retst,
diff --git a/arch/arm/mach-omap2/prm2xxx_3xxx.c b/arch/arm/mach-omap2/prm2xxx_3xxx.c
index 30517f5af707..a3e121f94a86 100644
--- a/arch/arm/mach-omap2/prm2xxx_3xxx.c
+++ b/arch/arm/mach-omap2/prm2xxx_3xxx.c
@@ -103,28 +103,6 @@ int omap2_prm_deassert_hardreset(s16 prm_mod, u8 rst_shift, u8 st_shift)
/* Powerdomain low-level functions */
/* Common functions across OMAP2 and OMAP3 */
-int omap2_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;
-}
-
-int omap2_pwrdm_read_next_pwrst(struct powerdomain *pwrdm)
-{
- return omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs,
- OMAP2_PM_PWSTCTRL,
- OMAP_POWERSTATE_MASK);
-}
-
-int omap2_pwrdm_read_pwrst(struct powerdomain *pwrdm)
-{
- return omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs,
- OMAP2_PM_PWSTST,
- OMAP_POWERSTATEST_MASK);
-}
-
int omap2_pwrdm_set_mem_onst(struct powerdomain *pwrdm, u8 bank,
u8 pwrst)
{
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,
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