From 9c3c133b1ed6e6d01bfabb6de29bf3d0f0886354 Mon Sep 17 00:00:00 2001 From: Alexander Clouter Date: Sun, 22 Feb 2009 12:03:56 +0800 Subject: hwrng: timeriomem - New driver Some hardware platforms, the TS-7800[1] is one for example, can supply the kernel with an entropy source, albeit a slow one for TS-7800 users, by just reading a particular IO address. This source must not be read above a certain rate otherwise the quality suffers. The driver is then hooked into by calling platform_device_(register|add|del) passing a structure similar to: ------ static struct timeriomem_rng_data ts78xx_ts_rng_data = { .address = (u32 *__iomem) TS_RNG, .period = 1000000, /* one second */ }; static struct platform_device ts78xx_ts_rng_device = { .name = "timeriomem_rng", .id = -1, .dev = { .platform_data = &ts78xx_ts_rng_data, }, .num_resources = 0, }; ------ [1] http://www.embeddedarm.com/products/board-detail.php?product=TS-7800 Signed-off-by: Alexander Clouter Signed-off-by: Herbert Xu --- drivers/char/hw_random/Kconfig | 14 ++++++++++++++ 1 file changed, 14 insertions(+) (limited to 'drivers/char/hw_random/Kconfig') diff --git a/drivers/char/hw_random/Kconfig b/drivers/char/hw_random/Kconfig index 8822eca58ffa..e86dd425a70f 100644 --- a/drivers/char/hw_random/Kconfig +++ b/drivers/char/hw_random/Kconfig @@ -20,6 +20,20 @@ config HW_RANDOM If unsure, say Y. +config HW_RANDOM_TIMERIOMEM + tristate "Timer IOMEM HW Random Number Generator support" + depends on HW_RANDOM + ---help--- + This driver provides kernel-side support for a generic Random + Number Generator used by reading a 'dumb' iomem address that + is to be read no faster than, for example, once a second; + the default FPGA bitstream on the TS-7800 has such functionality. + + To compile this driver as a module, choose M here: the + module will be called timeriomem-rng. + + If unsure, say Y. + config HW_RANDOM_INTEL tristate "Intel HW Random Number Generator support" depends on HW_RANDOM && (X86 || IA64) && PCI -- cgit v1.2.3 From e88cd6ff2ce14ed7025d253b7f7f468d38415f77 Mon Sep 17 00:00:00 2001 From: Heiko Carstens Date: Sat, 21 Mar 2009 14:19:04 +0800 Subject: hwrng: timeriomem - Breaks an allyesconfig build on s390: CC drivers/char/hw_random/timeriomem-rng.o drivers/char/hw_random/timeriomem-rng.c: In function 'timeriomem_rng_data_read': drivers/char/hw_random/timeriomem-rng.c:60: error: implicit declaration of function 'readl' Signed-off-by: Heiko Carstens Signed-off-by: Herbert Xu --- drivers/char/hw_random/Kconfig | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers/char/hw_random/Kconfig') diff --git a/drivers/char/hw_random/Kconfig b/drivers/char/hw_random/Kconfig index e86dd425a70f..5fab6470f4b2 100644 --- a/drivers/char/hw_random/Kconfig +++ b/drivers/char/hw_random/Kconfig @@ -22,7 +22,7 @@ config HW_RANDOM config HW_RANDOM_TIMERIOMEM tristate "Timer IOMEM HW Random Number Generator support" - depends on HW_RANDOM + depends on HW_RANDOM && HAS_IOMEM ---help--- This driver provides kernel-side support for a generic Random Number Generator used by reading a 'dumb' iomem address that -- cgit v1.2.3