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[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>
This commit is contained in:
Alexander Clouter 2009-05-03 12:57:48 -07:00 committed by Nicolas Pitre
parent 9fa7eb283c
commit a914d4309c
3 changed files with 61 additions and 1 deletions
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3
arch/arm/configs/orion5x_defconfig
View File

@ -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

1
arch/arm/mach-orion5x/ts78xx-fpga.h
View File

@ -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 {

58
arch/arm/mach-orion5x/ts78xx-setup.c
View File

@ -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;
}