OMAP4: Smartreflex framework extensions

This patch extends the smartreflex framework to support
OMAP4. The changes are minor like compiling smartreflex Kconfig
option for OMAP4 also, and a couple of OMAP4 checks in
the smartreflex framework.

The change in sr_device.c where new logic has to be introduced
for reading the efuse registers is due to the fact that in OMAP4
the efuse registers are 24 bit aligned. A __raw_readl will
fail for non-32 bit aligned address and hence the 8-bit read
and shift.

Signed-off-by: Thara Gopinath <thara@ti.com>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>

1 files changed, 16 insertions, 1 deletions

diff --git a/arch/arm/mach-omap2/sr_device.c b/arch/arm/mach-omap2/sr_device.c
index 9a3538fb633a..786d685c09a9 100644
--- a/arch/arm/mach-omap2/sr_device.c
+++ b/arch/arm/mach-omap2/sr_device.c
@@ -20,6 +20,7 @@
 
 #include <linux/err.h>
 #include <linux/slab.h>
+#include <linux/io.h>
 
 #include <plat/omap_device.h>
 #include <plat/smartreflex.h>
@@ -51,7 +52,21 @@ static void __init sr_set_nvalues(struct omap_volt_data *volt_data,
                         GFP_KERNEL);
 
         for (i = 0; i < count; i++) {
-                u32 v = omap_ctrl_readl(volt_data[i].sr_efuse_offs);
+                u32 v;
+                /*
+                 * In OMAP4 the efuse registers are 24 bit aligned.
+                 * A __raw_readl will fail for non-32 bit aligned address
+                 * and hence the 8-bit read and shift.
+                 */
+                if (cpu_is_omap44xx()) {
+                        u16 offset = volt_data[i].sr_efuse_offs;
+
+                        v = omap_ctrl_readb(offset) |
+                                omap_ctrl_readb(offset + 1) << 8 |
+                                omap_ctrl_readb(offset + 2) << 16;
+                } else {
+                         v = omap_ctrl_readl(volt_data[i].sr_efuse_offs);
+                }
 
                 nvalue_table[i].efuse_offs = volt_data[i].sr_efuse_offs;
                 nvalue_table[i].nvalue = v;