[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>

diff --git a/arch/arm/configs/orion5x_defconfig b/arch/arm/configs/orion5x_defconfig
index 5b98f7645119ce0627e90a99dc9c889d1a303a98..9e2385293ecbc52449933bfa60adb3247d4286c6 100644 (file)
--- 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 0f9cdf458952f0da68c0450e35f9c1875d7239da..37b3d4875291af1a076dd4c77f4455f2a8827fc8 100644 (file)
--- 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 9a6b397f972d533908c096468958bdf6629c997c..5041d1bc26b132e1f0aa7629d6b6be5184d3fcea 100644 (file)
--- 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>
@@ -269,6 +270,50 @@ static void ts78xx_ts_nand_unload(void)
        platform_device_del(&ts78xx_ts_nand_device);
 }
 
+/*****************************************************************************
+ * 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
  ****************************************************************************/
@@ -276,6 +321,7 @@ 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;
 }