[v3,5/8] hwrng: omap - Add support for 128-bit output of data

Commit Message

Romain Perier Sept. 16, 2016, 10:08 a.m. UTC

So far, this driver only supports up to 64 bits of output data generated
by an RNG. Some IP blocks, like the SafeXcel IP-76 supports up to 128
bits of output data. This commits renames registers descriptions
OUTPUT_L_REG and OUTPUT_H_REG to OUTPUT_0_REG and OUPUT_1_REG,
respectively. It also adds two new values to the enumeration of existing
registers: OUTPUT_2_REG and OUTPUT_3_REG.

Signed-off-by: Romain Perier <[e-mail]>
---
 drivers/char/hw_random/omap-rng.c | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

Patch

diff --git a/drivers/char/hw_random/omap-rng.c b/drivers/char/hw_random/omap-rng.c
index 5ea804d..a84ab49 100644
--- a/drivers/char/hw_random/omap-rng.c
+++ b/drivers/char/hw_random/omap-rng.c
@@ -65,8 +65,10 @@ 
 #define OMAP4_RNG_OUTPUT_SIZE			0x8
 
 enum {
-	RNG_OUTPUT_L_REG = 0,
-	RNG_OUTPUT_H_REG,
+	RNG_OUTPUT_0_REG = 0,
+	RNG_OUTPUT_1_REG,
+	RNG_OUTPUT_2_REG,
+	RNG_OUTPUT_3_REG,
 	RNG_STATUS_REG,
 	RNG_INTMASK_REG,
 	RNG_INTACK_REG,
@@ -82,7 +84,7 @@  enum {
 };
 
 static const u16 reg_map_omap2[] = {
-	[RNG_OUTPUT_L_REG]	= 0x0,
+	[RNG_OUTPUT_0_REG]	= 0x0,
 	[RNG_STATUS_REG]	= 0x4,
 	[RNG_CONFIG_REG]	= 0x28,
 	[RNG_REV_REG]		= 0x3c,
@@ -90,8 +92,8 @@  static const u16 reg_map_omap2[] = {
 };
 
 static const u16 reg_map_omap4[] = {
-	[RNG_OUTPUT_L_REG]	= 0x0,
-	[RNG_OUTPUT_H_REG]	= 0x4,
+	[RNG_OUTPUT_0_REG]	= 0x0,
+	[RNG_OUTPUT_1_REG]	= 0x4,
 	[RNG_STATUS_REG]	= 0x8,
 	[RNG_INTMASK_REG]	= 0xc,
 	[RNG_INTACK_REG]	= 0x10,
@@ -163,7 +165,7 @@  static int omap_rng_do_read(struct hwrng *rng, void *data, size_t max,
 	if (!present)
 		return 0;
 
-	memcpy_fromio(data, priv->base + priv->pdata->regs[RNG_OUTPUT_L_REG],
+	memcpy_fromio(data, priv->base + priv->pdata->regs[RNG_OUTPUT_0_REG],
 		      priv->pdata->data_size);
 
 	if (priv->pdata->regs[RNG_INTACK_REG])