[ARM] orion: add hwrng timeriomem hook to TS-78xx

Add hook so that the HW RNG source on the TS-78xx is available.

Signed-off-by: Alexander Clouter <alex@digriz.org.uk>
Signed-off-by: Nicolas Pitre <nico@marvell.com>

3 files changed, 61 insertions, 1 deletions

diff --git a/arch/arm/configs/orion5x_defconfig b/arch/arm/configs/orion5x_defconfig
index 5b98f7645119..9e2385293ecb 100644
--- a/arch/arm/configs/orion5x_defconfig
+++ b/arch/arm/configs/orion5x_defconfig
@@ -903,7 +903,8 @@ CONFIG_UNIX98_PTYS=y
 CONFIG_LEGACY_PTYS=y
 CONFIG_LEGACY_PTY_COUNT=16
 # CONFIG_IPMI_HANDLER is not set
-# CONFIG_HW_RANDOM is not set
+CONFIG_HW_RANDOM=m
+CONFIG_HW_RANDOM_TIMERIOMEM=m
 # CONFIG_R3964 is not set
 # CONFIG_APPLICOM is not set
 # CONFIG_RAW_DRIVER is not set
diff --git a/arch/arm/mach-orion5x/ts78xx-fpga.h b/arch/arm/mach-orion5x/ts78xx-fpga.h
index 0f9cdf458952..37b3d4875291 100644
--- a/arch/arm/mach-orion5x/ts78xx-fpga.h
+++ b/arch/arm/mach-orion5x/ts78xx-fpga.h
@@ -25,6 +25,7 @@ struct fpga_devices {
         /* Technologic Systems */
         struct fpga_device      ts_rtc;
         struct fpga_device      ts_nand;
+        struct fpga_device      ts_rng;
 };
 
 struct ts78xx_fpga_data {
diff --git a/arch/arm/mach-orion5x/ts78xx-setup.c b/arch/arm/mach-orion5x/ts78xx-setup.c
index 9a6b397f972d..5041d1bc26b1 100644
--- a/arch/arm/mach-orion5x/ts78xx-setup.c
+++ b/arch/arm/mach-orion5x/ts78xx-setup.c
@@ -17,6 +17,7 @@
 #include <linux/m48t86.h>
 #include <linux/mtd/nand.h>
 #include <linux/mtd/partitions.h>
+#include <linux/timeriomem-rng.h>
 #include <asm/mach-types.h>
 #include <asm/mach/arch.h>
 #include <asm/mach/map.h>
@@ -270,12 +271,57 @@ static void ts78xx_ts_nand_unload(void)
 }
 
 /*****************************************************************************
+ * HW RNG
+ ****************************************************************************/
+#define TS_RNG_DATA     (TS78XX_FPGA_REGS_PHYS_BASE | 0x044)
+
+static struct resource ts78xx_ts_rng_resource = {
+        .flags          = IORESOURCE_MEM,
+        .start          = TS_RNG_DATA,
+        .end            = TS_RNG_DATA + 4 - 1,
+};
+
+static struct timeriomem_rng_data ts78xx_ts_rng_data = {
+        .period         = 1000000, /* one second */
+};
+
+static struct platform_device ts78xx_ts_rng_device = {
+        .name           = "timeriomem_rng",
+        .id             = -1,
+        .dev            = {
+                .platform_data  = &ts78xx_ts_rng_data,
+        },
+        .resource       = &ts78xx_ts_rng_resource,
+        .num_resources  = 1,
+};
+
+static int ts78xx_ts_rng_load(void)
+{
+        int rc;
+
+        if (ts78xx_fpga.supports.ts_rng.init == 0) {
+                rc = platform_device_register(&ts78xx_ts_rng_device);
+                if (!rc)
+                        ts78xx_fpga.supports.ts_rng.init = 1;
+        } else
+                rc = platform_device_add(&ts78xx_ts_rng_device);
+
+        return rc;
+};
+
+static void ts78xx_ts_rng_unload(void)
+{
+        platform_device_del(&ts78xx_ts_rng_device);
+}
+
+/*****************************************************************************
  * FPGA 'hotplug' support code
  ****************************************************************************/
 static void ts78xx_fpga_devices_zero_init(void)
 {
         ts78xx_fpga.supports.ts_rtc.init = 0;
         ts78xx_fpga.supports.ts_nand.init = 0;
+        ts78xx_fpga.supports.ts_rng.init = 0;
 }
 
 static void ts78xx_fpga_supports(void)
@@ -289,10 +335,12 @@ static void ts78xx_fpga_supports(void)
         case TS7800_REV_5:
                 ts78xx_fpga.supports.ts_rtc.present = 1;
                 ts78xx_fpga.supports.ts_nand.present = 1;
+                ts78xx_fpga.supports.ts_rng.present = 1;
                 break;
         default:
                 ts78xx_fpga.supports.ts_rtc.present = 0;
                 ts78xx_fpga.supports.ts_nand.present = 0;
+                ts78xx_fpga.supports.ts_rng.present = 0;
         }
 }
 
@@ -316,6 +364,14 @@ static int ts78xx_fpga_load_devices(void)
                 }
                 ret |= tmp;
         }
+        if (ts78xx_fpga.supports.ts_rng.present == 1) {
+                tmp = ts78xx_ts_rng_load();
+                if (tmp) {
+                        printk(KERN_INFO "TS-78xx: RNG not registered\n");
+                        ts78xx_fpga.supports.ts_rng.present = 0;
+                }
+                ret |= tmp;
+        }
 
         return ret;
 }
@@ -328,6 +384,8 @@ static int ts78xx_fpga_unload_devices(void)
                 ts78xx_ts_rtc_unload();
         if (ts78xx_fpga.supports.ts_nand.present == 1)
                 ts78xx_ts_nand_unload();
+        if (ts78xx_fpga.supports.ts_rng.present == 1)
+                ts78xx_ts_rng_unload();
 
         return ret;
 }