ARM: OMAP4: hwmod: flag hwmods/modules not supporting module level context status

On OMAP4 most modules/hwmods support module level context status. On
OMAP3 and earlier, we relied on the power domain level context status.
Identify all modules that don't support 'context_offs' by adding a
flag bit, HWMOD_OMAP4_NO_CONTEXT_LOSS_BIT.  Rest have a valid
'context_offs' populated in .prcm structure already.
Signed-off-by: Tero Kristo <t-kristo@ti.com>
[paul@pwsan.com: add flag bit rather than overloading .context_offs;
 update changelog message]
Signed-off-by: Paul Walmsley <paul@pwsan.com>

arch/arm/mach-omap2/omap_hwmod_44xx_data.c

@@ -204,6 +204,7 @@ static struct omap_hwmod omap44xx_l4_abe_hwmod = {
 			.clkctrl_offs = OMAP4_CM1_ABE_L4ABE_CLKCTRL_OFFSET,
 			.context_offs = OMAP4_RM_ABE_AESS_CONTEXT_OFFSET,
 			.lostcontext_mask = OMAP4430_LOSTMEM_AESSMEM_MASK,
+			.flags	      = HWMOD_OMAP4_NO_CONTEXT_LOSS_BIT,
 		},
 	},
 };
@@ -260,6 +261,11 @@ static struct omap_hwmod omap44xx_mpu_private_hwmod = {
 	.name		= "mpu_private",
 	.class		= &omap44xx_mpu_bus_hwmod_class,
 	.clkdm_name	= "mpuss_clkdm",
+	.prcm = {
+		.omap4 = {
+			.flags = HWMOD_OMAP4_NO_CONTEXT_LOSS_BIT,
+		},
+	},
 };
 
 /*
@@ -449,6 +455,11 @@ static struct omap_hwmod omap44xx_ctrl_module_core_hwmod = {
 	.class		= &omap44xx_ctrl_module_hwmod_class,
 	.clkdm_name	= "l4_cfg_clkdm",
 	.mpu_irqs	= omap44xx_ctrl_module_core_irqs,
+	.prcm = {
+		.omap4 = {
+			.flags = HWMOD_OMAP4_NO_CONTEXT_LOSS_BIT,
+		},
+	},
 };
 
 /* ctrl_module_pad_core */
@@ -456,6 +467,11 @@ static struct omap_hwmod omap44xx_ctrl_module_pad_core_hwmod = {
 	.name		= "ctrl_module_pad_core",
 	.class		= &omap44xx_ctrl_module_hwmod_class,
 	.clkdm_name	= "l4_cfg_clkdm",
+	.prcm = {
+		.omap4 = {
+			.flags = HWMOD_OMAP4_NO_CONTEXT_LOSS_BIT,
+		},
+	},
 };
 
 /* ctrl_module_wkup */
@@ -463,6 +479,11 @@ static struct omap_hwmod omap44xx_ctrl_module_wkup_hwmod = {
 	.name		= "ctrl_module_wkup",
 	.class		= &omap44xx_ctrl_module_hwmod_class,
 	.clkdm_name	= "l4_wkup_clkdm",
+	.prcm = {
+		.omap4 = {
+			.flags = HWMOD_OMAP4_NO_CONTEXT_LOSS_BIT,
+		},
+	},
 };
 
 /* ctrl_module_pad_wkup */
@@ -470,6 +491,11 @@ static struct omap_hwmod omap44xx_ctrl_module_pad_wkup_hwmod = {
 	.name		= "ctrl_module_pad_wkup",
 	.class		= &omap44xx_ctrl_module_hwmod_class,
 	.clkdm_name	= "l4_wkup_clkdm",
+	.prcm = {
+		.omap4 = {
+			.flags = HWMOD_OMAP4_NO_CONTEXT_LOSS_BIT,
+		},
+	},
 };
 
 /*
@@ -2539,18 +2565,33 @@ static struct omap_hwmod omap44xx_prcm_mpu_hwmod = {
 	.name		= "prcm_mpu",
 	.class		= &omap44xx_prcm_hwmod_class,
 	.clkdm_name	= "l4_wkup_clkdm",
+	.prcm = {
+		.omap4 = {
+			.flags = HWMOD_OMAP4_NO_CONTEXT_LOSS_BIT,
+		},
+	},
 };
 
 /* cm_core_aon */
 static struct omap_hwmod omap44xx_cm_core_aon_hwmod = {
 	.name		= "cm_core_aon",
 	.class		= &omap44xx_prcm_hwmod_class,
+	.prcm = {
+		.omap4 = {
+			.flags = HWMOD_OMAP4_NO_CONTEXT_LOSS_BIT,
+		},
+	},
 };
 
 /* cm_core */
 static struct omap_hwmod omap44xx_cm_core_hwmod = {
 	.name		= "cm_core",
 	.class		= &omap44xx_prcm_hwmod_class,
+	.prcm = {
+		.omap4 = {
+			.flags = HWMOD_OMAP4_NO_CONTEXT_LOSS_BIT,
+		},
+	},
 };
 
 /* prm */
@@ -2586,6 +2627,11 @@ static struct omap_hwmod omap44xx_scrm_hwmod = {
 	.name		= "scrm",
 	.class		= &omap44xx_scrm_hwmod_class,
 	.clkdm_name	= "l4_wkup_clkdm",
+	.prcm = {
+		.omap4 = {
+			.flags = HWMOD_OMAP4_NO_CONTEXT_LOSS_BIT,
+		},
+	},
 };
 
 /*

arch/arm/plat-omap/include/plat/omap_hwmod.h

@@ -2,7 +2,7 @@
  * omap_hwmod macros, structures
  *
  * Copyright (C) 2009-2011 Nokia Corporation
- * Copyright (C) 2011 Texas Instruments, Inc.
+ * Copyright (C) 2012 Texas Instruments, Inc.
  * Paul Walmsley
  *
  * Created in collaboration with (alphabetical order): Benoît Cousson,
@@ -384,6 +384,14 @@ struct omap_hwmod_omap2_prcm {
 	u8 idlest_stdby_bit;
 };
 
+/*
+ * Possible values for struct omap_hwmod_omap4_prcm.flags
+ *
+ * HWMOD_OMAP4_NO_CONTEXT_LOSS_BIT: Some IP blocks don't have a PRCM
+ *     module-level context loss register associated with them; this
+ *     flag bit should be set in those cases
+ */
+#define HWMOD_OMAP4_NO_CONTEXT_LOSS_BIT		(1 << 0)
 
 /**
  * struct omap_hwmod_omap4_prcm - OMAP4-specific PRCM data
@@ -392,6 +400,7 @@ struct omap_hwmod_omap2_prcm {
  * @lostcontext_mask: bitmask for selecting bits from RM_*_CONTEXT register
  * @rstst_reg: (AM33XX only) address of the XXX_RSTST register in the PRM
  * @submodule_wkdep_bit: bit shift of the WKDEP range
+ * @flags: PRCM register capabilities for this IP block
  *
  * If @lostcontext_mask is not defined, context loss check code uses
  * whole register without masking. @lostcontext_mask should only be
@@ -406,6 +415,7 @@ struct omap_hwmod_omap4_prcm {
 	u32		lostcontext_mask;
 	u8		submodule_wkdep_bit;
 	u8		modulemode;
+	u8		flags;
 };