Merge tag 'omap-cleanup-b2-for-3.8' of git://git.kernel.org/pub/scm/linux/kernel/git/pjw/omap-pending into omap-for-v3.8/cleanup-prcm

Second set of OMAP PRCM cleanups for 3.8.

These patches remove the use of omap_prcm_get_reset_sources() from the
OMAP watchdog driver, and remove mach-omap2/prcm.c and
plat-omap/include/plat/prcm.h.

Basic test logs for this branch on top of Tony's cleanup-prcm branch
at commit 7fc54fd3084457c7f11b9e2e1e3fcd19a3badc33 are here:

    http://www.pwsan.com/omap/testlogs/prcm_cleanup_b_3.8/20121108151646/

However, cleanup-prcm at 7fc54fd3 does not include some fixes
that are needed for a successful test.  With several reverts,
fixes, and workarounds applied, the following test logs were
obtained:

    http://www.pwsan.com/omap/testlogs/TEST_prcm_cleanup_b_3.8/20121108151930/

 which indicate that the series tests cleanly.

This second pull request updates one of the patches which broke
with rmk's allnoconfigs, and also updates the tag description to
indicate that 7fc54fd3 is building cleanly here.

1 files changed, 127 insertions, 1 deletions

diff --git a/arch/arm/mach-omap2/cm2xxx.c b/arch/arm/mach-omap2/cm2xxx.c
index 64165013daf9..db650690e9d0 100644
--- a/arch/arm/mach-omap2/cm2xxx.c
+++ b/arch/arm/mach-omap2/cm2xxx.c
@@ -35,6 +35,9 @@
 #define OMAP2XXX_APLL_AUTOIDLE_DISABLE			0x0
 #define OMAP2XXX_APLL_AUTOIDLE_LOW_POWER_STOP		0x3
 
+/* CM_IDLEST_PLL bit value offset for APLLs (OMAP2xxx only) */
+#define EN_APLL_LOCKED					3
+
 static const u8 omap2xxx_cm_idlest_offs[] = {
 	CM_IDLEST1, CM_IDLEST2, OMAP2430_CM_IDLEST3, OMAP24XX_CM_IDLEST4
 };
@@ -99,7 +102,7 @@ void omap2xxx_cm_set_dpll_auto_low_power_stop(void)
 }
 
 /*
- * APLL autoidle control
+ * APLL control
  */
 
 static void _omap2xxx_set_apll_autoidle(u8 m, u32 mask)
@@ -136,6 +139,102 @@ void omap2xxx_cm_set_apll96_auto_low_power_stop(void)
 				    OMAP24XX_AUTO_96M_MASK);
 }
 
+/* Enable an APLL if off */
+static int _omap2xxx_apll_enable(u8 enable_bit, u8 status_bit)
+{
+	u32 v, m;
+
+	m = EN_APLL_LOCKED << enable_bit;
+
+	v = omap2_cm_read_mod_reg(PLL_MOD, CM_CLKEN);
+	if (v & m)
+		return 0;   /* apll already enabled */
+
+	v |= m;
+	omap2_cm_write_mod_reg(v, PLL_MOD, CM_CLKEN);
+
+	omap2xxx_cm_wait_module_ready(PLL_MOD, 1, status_bit);
+
+	/*
+	 * REVISIT: Should we return an error code if
+	 * omap2xxx_cm_wait_module_ready() fails?
+	 */
+	return 0;
+}
+
+/* Stop APLL */
+static void _omap2xxx_apll_disable(u8 enable_bit)
+{
+	u32 v;
+
+	v = omap2_cm_read_mod_reg(PLL_MOD, CM_CLKEN);
+	v &= ~(EN_APLL_LOCKED << enable_bit);
+	omap2_cm_write_mod_reg(v, PLL_MOD, CM_CLKEN);
+}
+
+/* Enable an APLL if off */
+int omap2xxx_cm_apll54_enable(void)
+{
+	return _omap2xxx_apll_enable(OMAP24XX_EN_54M_PLL_SHIFT,
+				     OMAP24XX_ST_54M_APLL_SHIFT);
+}
+
+/* Enable an APLL if off */
+int omap2xxx_cm_apll96_enable(void)
+{
+	return _omap2xxx_apll_enable(OMAP24XX_EN_96M_PLL_SHIFT,
+				     OMAP24XX_ST_96M_APLL_SHIFT);
+}
+
+/* Stop APLL */
+void omap2xxx_cm_apll54_disable(void)
+{
+	_omap2xxx_apll_disable(OMAP24XX_EN_54M_PLL_SHIFT);
+}
+
+/* Stop APLL */
+void omap2xxx_cm_apll96_disable(void)
+{
+	_omap2xxx_apll_disable(OMAP24XX_EN_96M_PLL_SHIFT);
+}
+
+/**
+ * omap2xxx_cm_split_idlest_reg - split CM_IDLEST reg addr into its components
+ * @idlest_reg: CM_IDLEST* virtual address
+ * @prcm_inst: pointer to an s16 to return the PRCM instance offset
+ * @idlest_reg_id: pointer to a u8 to return the CM_IDLESTx register ID
+ *
+ * XXX This function is only needed until absolute register addresses are
+ * removed from the OMAP struct clk records.
+ */
+int omap2xxx_cm_split_idlest_reg(void __iomem *idlest_reg, s16 *prcm_inst,
+				 u8 *idlest_reg_id)
+{
+	unsigned long offs;
+	u8 idlest_offs;
+	int i;
+
+	if (idlest_reg < cm_base || idlest_reg > (cm_base + 0x0fff))
+		return -EINVAL;
+
+	idlest_offs = (unsigned long)idlest_reg & 0xff;
+	for (i = 0; i < ARRAY_SIZE(omap2xxx_cm_idlest_offs); i++) {
+		if (idlest_offs == omap2xxx_cm_idlest_offs[i]) {
+			*idlest_reg_id = i + 1;
+			break;
+		}
+	}
+
+	if (i == ARRAY_SIZE(omap2xxx_cm_idlest_offs))
+		return -EINVAL;
+
+	offs = idlest_reg - cm_base;
+	offs &= 0xff00;
+	*prcm_inst = offs;
+
+	return 0;
+}
+
 /*
  *
  */
@@ -253,3 +352,30 @@ struct clkdm_ops omap2_clkdm_operations = {
 	.clkdm_clk_disable	= omap2xxx_clkdm_clk_disable,
 };
 
+/*
+ *
+ */
+
+static struct cm_ll_data omap2xxx_cm_ll_data = {
+	.split_idlest_reg	= &omap2xxx_cm_split_idlest_reg,
+	.wait_module_ready	= &omap2xxx_cm_wait_module_ready,
+};
+
+int __init omap2xxx_cm_init(void)
+{
+	if (!cpu_is_omap24xx())
+		return 0;
+
+	return cm_register(&omap2xxx_cm_ll_data);
+}
+
+static void __exit omap2xxx_cm_exit(void)
+{
+	if (!cpu_is_omap24xx())
+		return;
+
+	/* Should never happen */
+	WARN(cm_unregister(&omap2xxx_cm_ll_data),
+	     "%s: cm_ll_data function pointer mismatch\n", __func__);
+}
+__exitcall(omap2xxx_cm_exit);