diff options
Diffstat (limited to 'target/linux/bcm27xx/patches-5.4/950-0204-hwrng-iproc-rng200-Add-BCM2838-support.patch')
| -rw-r--r-- | target/linux/bcm27xx/patches-5.4/950-0204-hwrng-iproc-rng200-Add-BCM2838-support.patch | 158 |
1 files changed, 0 insertions, 158 deletions
diff --git a/target/linux/bcm27xx/patches-5.4/950-0204-hwrng-iproc-rng200-Add-BCM2838-support.patch b/target/linux/bcm27xx/patches-5.4/950-0204-hwrng-iproc-rng200-Add-BCM2838-support.patch deleted file mode 100644 index c9eac88066..0000000000 --- a/target/linux/bcm27xx/patches-5.4/950-0204-hwrng-iproc-rng200-Add-BCM2838-support.patch +++ /dev/null @@ -1,158 +0,0 @@ -From cbf5cde9c460eae458829a7b357cea6734c4755b Mon Sep 17 00:00:00 2001 -From: Stefan Wahren <wahrenst@gmx.net> -Date: Sat, 4 May 2019 17:06:15 +0200 -Subject: [PATCH] hwrng: iproc-rng200: Add BCM2838 support - -The HWRNG on the BCM2838 is compatible to iproc-rng200, so add the -support to this driver instead of bcm2835-rng. - -Signed-off-by: Stefan Wahren <wahrenst@gmx.net> ---- - drivers/char/hw_random/Kconfig | 4 +- - drivers/char/hw_random/iproc-rng200.c | 81 +++++++++++++++++++++++++-- - 2 files changed, 79 insertions(+), 6 deletions(-) - ---- a/drivers/char/hw_random/Kconfig -+++ b/drivers/char/hw_random/Kconfig -@@ -90,11 +90,11 @@ config HW_RANDOM_BCM2835 - - config HW_RANDOM_IPROC_RNG200 - tristate "Broadcom iProc/STB RNG200 support" -- depends on ARCH_BCM_IPROC || ARCH_BRCMSTB -+ depends on ARCH_BCM_IPROC || ARCH_BCM2835 || ARCH_BRCMSTB - default HW_RANDOM - ---help--- - This driver provides kernel-side support for the RNG200 -- hardware found on the Broadcom iProc and STB SoCs. -+ hardware found on the Broadcom iProc, BCM2838 and STB SoCs. - - To compile this driver as a module, choose M here: the - module will be called iproc-rng200 ---- a/drivers/char/hw_random/iproc-rng200.c -+++ b/drivers/char/hw_random/iproc-rng200.c -@@ -29,6 +29,7 @@ - #define RNG_CTRL_RNG_RBGEN_MASK 0x00001FFF - #define RNG_CTRL_RNG_RBGEN_ENABLE 0x00000001 - #define RNG_CTRL_RNG_RBGEN_DISABLE 0x00000000 -+#define RNG_CTRL_RNG_DIV_CTRL_SHIFT 13 - - #define RNG_SOFT_RESET_OFFSET 0x04 - #define RNG_SOFT_RESET 0x00000001 -@@ -36,16 +37,23 @@ - #define RBG_SOFT_RESET_OFFSET 0x08 - #define RBG_SOFT_RESET 0x00000001 - -+#define RNG_TOTAL_BIT_COUNT_OFFSET 0x0C -+ -+#define RNG_TOTAL_BIT_COUNT_THRESHOLD_OFFSET 0x10 -+ - #define RNG_INT_STATUS_OFFSET 0x18 - #define RNG_INT_STATUS_MASTER_FAIL_LOCKOUT_IRQ_MASK 0x80000000 - #define RNG_INT_STATUS_STARTUP_TRANSITIONS_MET_IRQ_MASK 0x00020000 - #define RNG_INT_STATUS_NIST_FAIL_IRQ_MASK 0x00000020 - #define RNG_INT_STATUS_TOTAL_BITS_COUNT_IRQ_MASK 0x00000001 - -+#define RNG_INT_ENABLE_OFFSET 0x1C -+ - #define RNG_FIFO_DATA_OFFSET 0x20 - - #define RNG_FIFO_COUNT_OFFSET 0x24 - #define RNG_FIFO_COUNT_RNG_FIFO_COUNT_MASK 0x000000FF -+#define RNG_FIFO_COUNT_RNG_FIFO_THRESHOLD_SHIFT 8 - - struct iproc_rng200_dev { - struct hwrng rng; -@@ -166,6 +174,64 @@ static int iproc_rng200_init(struct hwrn - return 0; - } - -+static int bcm2838_rng200_read(struct hwrng *rng, void *buf, size_t max, -+ bool wait) -+{ -+ struct iproc_rng200_dev *priv = to_rng_priv(rng); -+ u32 max_words = max / sizeof(u32); -+ u32 num_words, count, val; -+ -+ /* ensure warm up period has elapsed */ -+ while (1) { -+ val = ioread32(priv->base + RNG_TOTAL_BIT_COUNT_OFFSET); -+ if (val > 16) -+ break; -+ cpu_relax(); -+ } -+ -+ /* ensure fifo is not empty */ -+ while (1) { -+ num_words = ioread32(priv->base + RNG_FIFO_COUNT_OFFSET) & -+ RNG_FIFO_COUNT_RNG_FIFO_COUNT_MASK; -+ if (num_words) -+ break; -+ if (!wait) -+ return 0; -+ cpu_relax(); -+ } -+ -+ if (num_words > max_words) -+ num_words = max_words; -+ -+ for (count = 0; count < num_words; count++) { -+ ((u32 *)buf)[count] = ioread32(priv->base + -+ RNG_FIFO_DATA_OFFSET); -+ } -+ -+ return num_words * sizeof(u32); -+} -+ -+static int bcm2838_rng200_init(struct hwrng *rng) -+{ -+ struct iproc_rng200_dev *priv = to_rng_priv(rng); -+ uint32_t val; -+ -+ if (ioread32(priv->base + RNG_CTRL_OFFSET) & RNG_CTRL_RNG_RBGEN_MASK) -+ return 0; -+ -+ /* initial numbers generated are "less random" so will be discarded */ -+ val = 0x40000; -+ iowrite32(val, priv->base + RNG_TOTAL_BIT_COUNT_THRESHOLD_OFFSET); -+ /* min fifo count to generate full interrupt */ -+ val = 2 << RNG_FIFO_COUNT_RNG_FIFO_THRESHOLD_SHIFT; -+ iowrite32(val, priv->base + RNG_FIFO_COUNT_OFFSET); -+ /* enable the rng - 1Mhz sample rate */ -+ val = (0x3 << RNG_CTRL_RNG_DIV_CTRL_SHIFT) | RNG_CTRL_RNG_RBGEN_MASK; -+ iowrite32(val, priv->base + RNG_CTRL_OFFSET); -+ -+ return 0; -+} -+ - static void iproc_rng200_cleanup(struct hwrng *rng) - { - struct iproc_rng200_dev *priv = to_rng_priv(rng); -@@ -202,10 +268,16 @@ static int iproc_rng200_probe(struct pla - return PTR_ERR(priv->base); - } - -- priv->rng.name = "iproc-rng200", -- priv->rng.read = iproc_rng200_read, -- priv->rng.init = iproc_rng200_init, -- priv->rng.cleanup = iproc_rng200_cleanup, -+ priv->rng.name = pdev->name; -+ priv->rng.cleanup = iproc_rng200_cleanup; -+ -+ if (of_device_is_compatible(dev->of_node, "brcm,bcm2838-rng200")) { -+ priv->rng.init = bcm2838_rng200_init; -+ priv->rng.read = bcm2838_rng200_read; -+ } else { -+ priv->rng.init = iproc_rng200_init; -+ priv->rng.read = iproc_rng200_read; -+ } - - /* Register driver */ - ret = devm_hwrng_register(dev, &priv->rng); -@@ -223,6 +295,7 @@ static const struct of_device_id iproc_r - { .compatible = "brcm,bcm7211-rng200", }, - { .compatible = "brcm,bcm7278-rng200", }, - { .compatible = "brcm,iproc-rng200", }, -+ { .compatible = "brcm,bcm2838-rng200"}, - {}, - }; - MODULE_DEVICE_TABLE(of, iproc_rng200_of_match); |