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>

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 */

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;

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)