RX-51: Add support for OMAP3 ROM Random Number Generator

Adding this driver as platform device and only for RX-51 until somebody test if
it working also on other OMAP3 HS devices and until there will be generic ARM
way to deal with SMC calls.

Signed-off-by: Pali Rohár <pali.rohar@gmail.com>
[tony@atomide.com: folded in the clock alias change]
Signed-off-by: Tony Lindgren <tony@atomide.com>

4 files changed, 32 insertions, 0 deletions

diff --git a/arch/arm/mach-omap2/board-rx51-peripherals.c b/arch/arm/mach-omap2/board-rx51-peripherals.c
index c3270c0f1fce..497d2604c7c5 100644
--- a/arch/arm/mach-omap2/board-rx51-peripherals.c
+++ b/arch/arm/mach-omap2/board-rx51-peripherals.c
@@ -57,6 +57,8 @@
 #include "common-board-devices.h"
 #include "gpmc.h"
 #include "gpmc-onenand.h"
+#include "soc.h"
+#include "omap-secure.h"
 
 #define SYSTEM_REV_B_USES_VAUX3 0x1699
 #define SYSTEM_REV_S_USES_VAUX3 0x8
@@ -1289,6 +1291,22 @@ static void __init rx51_init_twl4030_hwmon(void)
         platform_device_register(&madc_hwmon);
 }
 
+static struct platform_device omap3_rom_rng_device = {
+        .name           = "omap3-rom-rng",
+        .id             = -1,
+        .dev    = {
+                .platform_data  = rx51_secure_rng_call,
+        },
+};
+
+static void __init rx51_init_omap3_rom_rng(void)
+{
+        if (omap_type() == OMAP2_DEVICE_TYPE_SEC) {
+                pr_info("RX-51: Registring OMAP3 HWRNG device\n");
+                platform_device_register(&omap3_rom_rng_device);
+        }
+}
+
 void __init rx51_peripherals_init(void)
 {
         rx51_i2c_init();
@@ -1309,5 +1327,6 @@ void __init rx51_peripherals_init(void)
 
         rx51_charger_init();
         rx51_init_twl4030_hwmon();
+        rx51_init_omap3_rom_rng();
 }
 
diff --git a/arch/arm/mach-omap2/cclock3xxx_data.c b/arch/arm/mach-omap2/cclock3xxx_data.c
index 334b76745900..03a2829beb8e 100644
--- a/arch/arm/mach-omap2/cclock3xxx_data.c
+++ b/arch/arm/mach-omap2/cclock3xxx_data.c
@@ -3275,6 +3275,7 @@ static struct omap_clk omap36xx_clks[] = {
 static struct omap_clk omap34xx_omap36xx_clks[] = {
         CLK(NULL,       "aes1_ick",     &aes1_ick),
         CLK("omap_rng", "ick",          &rng_ick),
+        CLK("omap3-rom-rng",    "ick",  &rng_ick),
         CLK(NULL,       "sha11_ick",    &sha11_ick),
         CLK(NULL,       "des1_ick",     &des1_ick),
         CLK(NULL,       "cam_mclk",     &cam_mclk),
diff --git a/arch/arm/mach-omap2/omap-secure.c b/arch/arm/mach-omap2/omap-secure.c
index 146a7c4e2a13..5ac122e88f67 100644
--- a/arch/arm/mach-omap2/omap-secure.c
+++ b/arch/arm/mach-omap2/omap-secure.c
@@ -135,3 +135,14 @@ u32 rx51_secure_update_aux_cr(u32 set_bits, u32 clear_bits)
                                       FLAG_START_CRITICAL,
                                       1, acr, 0, 0, 0);
 }
+
+/**
+ * rx51_secure_rng_call: Routine for HW random generator
+ */
+u32 rx51_secure_rng_call(u32 ptr, u32 count, u32 flag)
+{
+        return rx51_secure_dispatcher(RX51_PPA_HWRNG,
+                                      0,
+                                      NO_FLAG,
+                                      3, ptr, count, flag, 0);
+}
diff --git a/arch/arm/mach-omap2/omap-secure.h b/arch/arm/mach-omap2/omap-secure.h
index 51b59c686a53..f6cabb0033fc 100644
--- a/arch/arm/mach-omap2/omap-secure.h
+++ b/arch/arm/mach-omap2/omap-secure.h
@@ -65,6 +65,7 @@ extern int omap_secure_ram_reserve_memblock(void);
 extern u32 rx51_secure_dispatcher(u32 idx, u32 process, u32 flag, u32 nargs,
                                   u32 arg1, u32 arg2, u32 arg3, u32 arg4);
 extern u32 rx51_secure_update_aux_cr(u32 set_bits, u32 clear_bits);
+extern u32 rx51_secure_rng_call(u32 ptr, u32 count, u32 flag);
 
 #ifdef CONFIG_OMAP4_ERRATA_I688
 extern int omap_barrier_reserve_memblock(void);