ARM: OMAP3: PRM: move modem reset to PRM driver

This is a more proper isolation of the code. Done in preparation of making
PRM an individual driver.
Signed-off-by: Tero Kristo <t-kristo@ti.com>

arch/arm/mach-omap2/pm34xx.c

@@ -371,10 +371,7 @@ static void __init omap3_d2d_idle(void)
 	omap_ctrl_writew(padconf, OMAP3_PADCONF_SAD2D_IDLEACK);
 
 	/* reset modem */
-	omap2_prm_write_mod_reg(OMAP3430_RM_RSTCTRL_CORE_MODEM_SW_RSTPWRON_MASK |
-			  OMAP3430_RM_RSTCTRL_CORE_MODEM_SW_RST_MASK,
-			  CORE_MOD, OMAP2_RM_RSTCTRL);
-	omap2_prm_write_mod_reg(0, CORE_MOD, OMAP2_RM_RSTCTRL);
+	omap3_prm_reset_modem();
 }
 
 static void __init prcm_setup_regs(void)

arch/arm/mach-omap2/prm3xxx.c

@@ -259,6 +259,21 @@ int omap3xxx_prm_clear_mod_irqs(s16 module, u8 regs, u32 ignore_bits)
 	return c;
 }
 
+/**
+ * omap3_prm_reset_modem - toggle reset signal for modem
+ *
+ * Toggles the reset signal to modem IP block. Required to allow
+ * OMAP3430 without stacked modem to idle properly.
+ */
+void __init omap3_prm_reset_modem(void)
+{
+	omap2_prm_write_mod_reg(
+		OMAP3430_RM_RSTCTRL_CORE_MODEM_SW_RSTPWRON_MASK |
+		OMAP3430_RM_RSTCTRL_CORE_MODEM_SW_RST_MASK,
+				CORE_MOD, OMAP2_RM_RSTCTRL);
+	omap2_prm_write_mod_reg(0, CORE_MOD, OMAP2_RM_RSTCTRL);
+}
+
 /**
  * omap3xxx_prm_reconfigure_io_chain - clear latches and reconfigure I/O chain
  *

arch/arm/mach-omap2/prm3xxx.h

@@ -164,6 +164,7 @@ extern int __init omap3xxx_prm_init(void);
 extern u32 omap3xxx_prm_get_reset_sources(void);
 int omap3xxx_prm_clear_mod_irqs(s16 module, u8 regs, u32 ignore_bits);
 void omap3xxx_prm_iva_idle(void);
+void omap3_prm_reset_modem(void);
 
 #endif /* __ASSEMBLER */