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authorAlexander Clouter <alex@digriz.org.uk>2009-05-03 12:57:48 -0700
committerNicolas Pitre <nico@cam.org>2009-06-03 15:29:40 -0400
commita914d4309c4cf6e7c4d0dbce4822dcad38a7cf27 (patch)
tree85eebd36c7fa8180b3e20a6414693e10d18a2afd /arch
parent9fa7eb283c5cdc2b0f4a8cfe6387ed82e5e9a3d3 (diff)
[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>
Diffstat (limited to 'arch')
-rw-r--r--arch/arm/configs/orion5x_defconfig3
-rw-r--r--arch/arm/mach-orion5x/ts78xx-fpga.h1
-rw-r--r--arch/arm/mach-orion5x/ts78xx-setup.c58
3 files changed, 61 insertions, 1 deletions
diff --git a/arch/arm/configs/orion5x_defconfig b/arch/arm/configs/orion5x_defconfig
index 5b98f764511..9e2385293ec 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 0f9cdf45895..37b3d487529 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 9a6b397f972..5041d1bc26b 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;
}