mirror of
https://github.com/torvalds/linux.git
synced 2024-12-28 22:02:28 +00:00
c11eede69b
Commit b5b4bb3f6a (of: only include prom.h on sparc) removed implicit
includes of of_*.h headers by powerpc's prom.h. Some components were
missed in initial clean-up patch, so add the necessary includes to fix
powerpc builds.
Signed-off-by: Rob Herring <rob.herring@calxeda.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Tejun Heo <tj@kernel.org>
Cc: Matt Mackall <mpm@selenic.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Vinod Koul <vinod.koul@intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: linuxppc-dev@lists.ozlabs.org
Cc: linux-ide@vger.kernel.org
Cc: linux-crypto@vger.kernel.org
148 lines
3.1 KiB
C
148 lines
3.1 KiB
C
/*
|
|
* Generic PowerPC 44x RNG driver
|
|
*
|
|
* Copyright 2011 IBM Corporation
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License as published by the
|
|
* Free Software Foundation; version 2 of the License.
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/hw_random.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/of_address.h>
|
|
#include <linux/of_platform.h>
|
|
#include <asm/io.h>
|
|
|
|
#define PPC4XX_TRNG_DEV_CTRL 0x60080
|
|
|
|
#define PPC4XX_TRNGE 0x00020000
|
|
#define PPC4XX_TRNG_CTRL 0x0008
|
|
#define PPC4XX_TRNG_CTRL_DALM 0x20
|
|
#define PPC4XX_TRNG_STAT 0x0004
|
|
#define PPC4XX_TRNG_STAT_B 0x1
|
|
#define PPC4XX_TRNG_DATA 0x0000
|
|
|
|
#define MODULE_NAME "ppc4xx_rng"
|
|
|
|
static int ppc4xx_rng_data_present(struct hwrng *rng, int wait)
|
|
{
|
|
void __iomem *rng_regs = (void __iomem *) rng->priv;
|
|
int busy, i, present = 0;
|
|
|
|
for (i = 0; i < 20; i++) {
|
|
busy = (in_le32(rng_regs + PPC4XX_TRNG_STAT) & PPC4XX_TRNG_STAT_B);
|
|
if (!busy || !wait) {
|
|
present = 1;
|
|
break;
|
|
}
|
|
udelay(10);
|
|
}
|
|
return present;
|
|
}
|
|
|
|
static int ppc4xx_rng_data_read(struct hwrng *rng, u32 *data)
|
|
{
|
|
void __iomem *rng_regs = (void __iomem *) rng->priv;
|
|
*data = in_le32(rng_regs + PPC4XX_TRNG_DATA);
|
|
return 4;
|
|
}
|
|
|
|
static int ppc4xx_rng_enable(int enable)
|
|
{
|
|
struct device_node *ctrl;
|
|
void __iomem *ctrl_reg;
|
|
int err = 0;
|
|
u32 val;
|
|
|
|
/* Find the main crypto device node and map it to turn the TRNG on */
|
|
ctrl = of_find_compatible_node(NULL, NULL, "amcc,ppc4xx-crypto");
|
|
if (!ctrl)
|
|
return -ENODEV;
|
|
|
|
ctrl_reg = of_iomap(ctrl, 0);
|
|
if (!ctrl_reg) {
|
|
err = -ENODEV;
|
|
goto out;
|
|
}
|
|
|
|
val = in_le32(ctrl_reg + PPC4XX_TRNG_DEV_CTRL);
|
|
|
|
if (enable)
|
|
val |= PPC4XX_TRNGE;
|
|
else
|
|
val = val & ~PPC4XX_TRNGE;
|
|
|
|
out_le32(ctrl_reg + PPC4XX_TRNG_DEV_CTRL, val);
|
|
iounmap(ctrl_reg);
|
|
|
|
out:
|
|
of_node_put(ctrl);
|
|
|
|
return err;
|
|
}
|
|
|
|
static struct hwrng ppc4xx_rng = {
|
|
.name = MODULE_NAME,
|
|
.data_present = ppc4xx_rng_data_present,
|
|
.data_read = ppc4xx_rng_data_read,
|
|
};
|
|
|
|
static int ppc4xx_rng_probe(struct platform_device *dev)
|
|
{
|
|
void __iomem *rng_regs;
|
|
int err = 0;
|
|
|
|
rng_regs = of_iomap(dev->dev.of_node, 0);
|
|
if (!rng_regs)
|
|
return -ENODEV;
|
|
|
|
err = ppc4xx_rng_enable(1);
|
|
if (err)
|
|
return err;
|
|
|
|
out_le32(rng_regs + PPC4XX_TRNG_CTRL, PPC4XX_TRNG_CTRL_DALM);
|
|
ppc4xx_rng.priv = (unsigned long) rng_regs;
|
|
|
|
err = hwrng_register(&ppc4xx_rng);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int ppc4xx_rng_remove(struct platform_device *dev)
|
|
{
|
|
void __iomem *rng_regs = (void __iomem *) ppc4xx_rng.priv;
|
|
|
|
hwrng_unregister(&ppc4xx_rng);
|
|
ppc4xx_rng_enable(0);
|
|
iounmap(rng_regs);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct of_device_id ppc4xx_rng_match[] = {
|
|
{ .compatible = "ppc4xx-rng", },
|
|
{ .compatible = "amcc,ppc460ex-rng", },
|
|
{ .compatible = "amcc,ppc440epx-rng", },
|
|
{},
|
|
};
|
|
|
|
static struct platform_driver ppc4xx_rng_driver = {
|
|
.driver = {
|
|
.name = MODULE_NAME,
|
|
.owner = THIS_MODULE,
|
|
.of_match_table = ppc4xx_rng_match,
|
|
},
|
|
.probe = ppc4xx_rng_probe,
|
|
.remove = ppc4xx_rng_remove,
|
|
};
|
|
|
|
module_platform_driver(ppc4xx_rng_driver);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Josh Boyer <jwboyer@linux.vnet.ibm.com>");
|
|
MODULE_DESCRIPTION("HW RNG driver for PPC 4xx processors");
|