1 files changed, 111 insertions, 1 deletions

diff --git a/arch/arm/mach-omap2/prm2xxx_3xxx.c b/arch/arm/mach-omap2/prm2xxx_3xxx.c
index 0d6cc543987d..bdddf5ca67c4 100644
--- a/arch/arm/mach-omap2/prm2xxx_3xxx.c
+++ b/arch/arm/mach-omap2/prm2xxx_3xxx.c
@@ -17,7 +17,7 @@
 #include <linux/io.h>
 
 #include "common.h"
-
+#include "powerdomain.h"
 #include "prm2xxx_3xxx.h"
 #include "prm-regbits-24xx.h"
 
@@ -98,3 +98,113 @@ int omap2_prm_deassert_hardreset(s16 prm_mod, u8 rst_shift, u8 st_shift)
         return (c == MAX_MODULE_HARDRESET_WAIT) ? -EBUSY : 0;
 }
 
+
+/* 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)
+{
+        u32 m;
+
+        m = omap2_pwrdm_get_mem_bank_onstate_mask(bank);
+
+        omap2_prm_rmw_mod_reg_bits(m, (pwrst << __ffs(m)), pwrdm->prcm_offs,
+                                   OMAP2_PM_PWSTCTRL);
+
+        return 0;
+}
+
+int omap2_pwrdm_set_mem_retst(struct powerdomain *pwrdm, u8 bank,
+                                                                u8 pwrst)
+{
+        u32 m;
+
+        m = omap2_pwrdm_get_mem_bank_retst_mask(bank);
+
+        omap2_prm_rmw_mod_reg_bits(m, (pwrst << __ffs(m)), pwrdm->prcm_offs,
+                                   OMAP2_PM_PWSTCTRL);
+
+        return 0;
+}
+
+int omap2_pwrdm_read_mem_pwrst(struct powerdomain *pwrdm, u8 bank)
+{
+        u32 m;
+
+        m = omap2_pwrdm_get_mem_bank_stst_mask(bank);
+
+        return omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs, OMAP2_PM_PWSTST,
+                                             m);
+}
+
+int omap2_pwrdm_read_mem_retst(struct powerdomain *pwrdm, u8 bank)
+{
+        u32 m;
+
+        m = omap2_pwrdm_get_mem_bank_retst_mask(bank);
+
+        return omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs,
+                                             OMAP2_PM_PWSTCTRL, m);
+}
+
+int omap2_pwrdm_set_logic_retst(struct powerdomain *pwrdm, u8 pwrst)
+{
+        u32 v;
+
+        v = pwrst << __ffs(OMAP_LOGICRETSTATE_MASK);
+        omap2_prm_rmw_mod_reg_bits(OMAP_LOGICRETSTATE_MASK, v, pwrdm->prcm_offs,
+                                   OMAP2_PM_PWSTCTRL);
+
+        return 0;
+}
+
+int omap2_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 ((omap2_prm_read_mod_reg(pwrdm->prcm_offs, OMAP2_PM_PWSTST) &
+                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;
+}
+