MIPS: TXx9: Add TX4939 RNG support

Add platform support for RNG of TX4939 SoC.

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

3 files changed, 21 insertions, 0 deletions

diff --git a/arch/mips/include/asm/txx9/tx4939.h b/arch/mips/include/asm/txx9/tx4939.h
index 050364d50b79..d4f342cd5939 100644
--- a/arch/mips/include/asm/txx9/tx4939.h
+++ b/arch/mips/include/asm/txx9/tx4939.h
@@ -45,6 +45,8 @@
 #define TX4939_RTC_REG          (TX4939_REG_BASE + 0xfb00)
 #define TX4939_CIR_REG          (TX4939_REG_BASE + 0xfc00)
 
+#define TX4939_RNG_REG          (TX4939_CRYPTO_REG + 0xb0)
+
 struct tx4939_le_reg {
         __u32 r;
         __u32 unused;
@@ -547,5 +549,6 @@ void tx4939_ndfmc_init(unsigned int hold, unsigned int spw,
 void tx4939_dmac_init(int memcpy_chan0, int memcpy_chan1);
 void tx4939_aclc_init(void);
 void tx4939_sramc_init(void);
+void tx4939_rng_init(void);
 
 #endif /* __ASM_TXX9_TX4939_H */
diff --git a/arch/mips/txx9/generic/setup_tx4939.c b/arch/mips/txx9/generic/setup_tx4939.c
index df13a891fb4b..3dc19f482959 100644
--- a/arch/mips/txx9/generic/setup_tx4939.c
+++ b/arch/mips/txx9/generic/setup_tx4939.c
@@ -500,6 +500,23 @@ void __init tx4939_sramc_init(void)
                 txx9_sramc_init(&tx4939_sram_resource);
 }
 
+void __init tx4939_rng_init(void)
+{
+        static struct resource res = {
+                .start = TX4939_RNG_REG & 0xfffffffffULL,
+                .end = (TX4939_RNG_REG & 0xfffffffffULL) + 0x30 - 1,
+                .flags = IORESOURCE_MEM,
+        };
+        static struct platform_device pdev = {
+                .name = "tx4939-rng",
+                .id = -1,
+                .num_resources = 1,
+                .resource = &res,
+        };
+
+        platform_device_register(&pdev);
+}
+
 static void __init tx4939_stop_unused_modules(void)
 {
         __u64 pcfg, rst = 0, ckd = 0;
diff --git a/arch/mips/txx9/rbtx4939/setup.c b/arch/mips/txx9/rbtx4939/setup.c
index b9196966447b..c033ffe71cdf 100644
--- a/arch/mips/txx9/rbtx4939/setup.c
+++ b/arch/mips/txx9/rbtx4939/setup.c
@@ -502,6 +502,7 @@ static void __init rbtx4939_device_init(void)
         tx4939_aclc_init();
         platform_device_register_simple("txx9aclc-generic", -1, NULL, 0);
         tx4939_sramc_init();
+        tx4939_rng_init();
 }
 
 static void __init rbtx4939_setup(void)