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linux/drivers/crypto/sunxi-ss/sun4i-ss-core.c
Chen-Yu Tsai 7ab64628bb crypto: sunxi-ss - Add optional reset control support 
On sun6i and later platforms, the reset control is split out of the
clock gates. Add support for an optional reset control.

Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2015-08-13 15:13:23 +08:00

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/*
* sun4i-ss-core.c - hardware cryptographic accelerator for Allwinner A20 SoC
*
* Copyright (C) 2013-2015 Corentin LABBE <clabbe.montjoie@gmail.com>
*
* Core file which registers crypto algorithms supported by the SS.
*
* You could find a link for the datasheet in Documentation/arm/sunxi/README
*
* 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; either version 2 of the License, or
* (at your option) any later version.
*/
#include <linux/clk.h>
#include <linux/crypto.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <crypto/scatterwalk.h>
#include <linux/scatterlist.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/reset.h>
#include "sun4i-ss.h"
static struct sun4i_ss_alg_template ss_algs[] = {
{ .type = CRYPTO_ALG_TYPE_AHASH,
.mode = SS_OP_MD5,
.alg.hash = {
.init = sun4i_hash_init,
.update = sun4i_hash_update,
.final = sun4i_hash_final,
.finup = sun4i_hash_finup,
.digest = sun4i_hash_digest,
.export = sun4i_hash_export_md5,
.import = sun4i_hash_import_md5,
.halg = {
.digestsize = MD5_DIGEST_SIZE,
.base = {
.cra_name = "md5",
.cra_driver_name = "md5-sun4i-ss",
.cra_priority = 300,
.cra_alignmask = 3,
.cra_flags = CRYPTO_ALG_TYPE_AHASH,
.cra_blocksize = MD5_HMAC_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct sun4i_req_ctx),
.cra_module = THIS_MODULE,
.cra_type = &crypto_ahash_type,
.cra_init = sun4i_hash_crainit
}
}
}
},
{ .type = CRYPTO_ALG_TYPE_AHASH,
.mode = SS_OP_SHA1,
.alg.hash = {
.init = sun4i_hash_init,
.update = sun4i_hash_update,
.final = sun4i_hash_final,
.finup = sun4i_hash_finup,
.digest = sun4i_hash_digest,
.export = sun4i_hash_export_sha1,
.import = sun4i_hash_import_sha1,
.halg = {
.digestsize = SHA1_DIGEST_SIZE,
.base = {
.cra_name = "sha1",
.cra_driver_name = "sha1-sun4i-ss",
.cra_priority = 300,
.cra_alignmask = 3,
.cra_flags = CRYPTO_ALG_TYPE_AHASH,
.cra_blocksize = SHA1_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct sun4i_req_ctx),
.cra_module = THIS_MODULE,
.cra_type = &crypto_ahash_type,
.cra_init = sun4i_hash_crainit
}
}
}
},
{ .type = CRYPTO_ALG_TYPE_ABLKCIPHER,
.alg.crypto = {
.cra_name = "cbc(aes)",
.cra_driver_name = "cbc-aes-sun4i-ss",
.cra_priority = 300,
.cra_blocksize = AES_BLOCK_SIZE,
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER,
.cra_ctxsize = sizeof(struct sun4i_tfm_ctx),
.cra_module = THIS_MODULE,
.cra_alignmask = 3,
.cra_type = &crypto_ablkcipher_type,
.cra_init = sun4i_ss_cipher_init,
.cra_ablkcipher = {
.min_keysize = AES_MIN_KEY_SIZE,
.max_keysize = AES_MAX_KEY_SIZE,
.ivsize = AES_BLOCK_SIZE,
.setkey = sun4i_ss_aes_setkey,
.encrypt = sun4i_ss_cbc_aes_encrypt,
.decrypt = sun4i_ss_cbc_aes_decrypt,
}
}
},
{ .type = CRYPTO_ALG_TYPE_ABLKCIPHER,
.alg.crypto = {
.cra_name = "ecb(aes)",
.cra_driver_name = "ecb-aes-sun4i-ss",
.cra_priority = 300,
.cra_blocksize = AES_BLOCK_SIZE,
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER,
.cra_ctxsize = sizeof(struct sun4i_tfm_ctx),
.cra_module = THIS_MODULE,
.cra_alignmask = 3,
.cra_type = &crypto_ablkcipher_type,
.cra_init = sun4i_ss_cipher_init,
.cra_ablkcipher = {
.min_keysize = AES_MIN_KEY_SIZE,
.max_keysize = AES_MAX_KEY_SIZE,
.ivsize = AES_BLOCK_SIZE,
.setkey = sun4i_ss_aes_setkey,
.encrypt = sun4i_ss_ecb_aes_encrypt,
.decrypt = sun4i_ss_ecb_aes_decrypt,
}
}
},
{ .type = CRYPTO_ALG_TYPE_ABLKCIPHER,
.alg.crypto = {
.cra_name = "cbc(des)",
.cra_driver_name = "cbc-des-sun4i-ss",
.cra_priority = 300,
.cra_blocksize = DES_BLOCK_SIZE,
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER,
.cra_ctxsize = sizeof(struct sun4i_req_ctx),
.cra_module = THIS_MODULE,
.cra_alignmask = 3,
.cra_type = &crypto_ablkcipher_type,
.cra_init = sun4i_ss_cipher_init,
.cra_u.ablkcipher = {
.min_keysize = DES_KEY_SIZE,
.max_keysize = DES_KEY_SIZE,
.ivsize = DES_BLOCK_SIZE,
.setkey = sun4i_ss_des_setkey,
.encrypt = sun4i_ss_cbc_des_encrypt,
.decrypt = sun4i_ss_cbc_des_decrypt,
}
}
},
{ .type = CRYPTO_ALG_TYPE_ABLKCIPHER,
.alg.crypto = {
.cra_name = "ecb(des)",
.cra_driver_name = "ecb-des-sun4i-ss",
.cra_priority = 300,
.cra_blocksize = DES_BLOCK_SIZE,
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER,
.cra_ctxsize = sizeof(struct sun4i_req_ctx),
.cra_module = THIS_MODULE,
.cra_alignmask = 3,
.cra_type = &crypto_ablkcipher_type,
.cra_init = sun4i_ss_cipher_init,
.cra_u.ablkcipher = {
.min_keysize = DES_KEY_SIZE,
.max_keysize = DES_KEY_SIZE,
.setkey = sun4i_ss_des_setkey,
.encrypt = sun4i_ss_ecb_des_encrypt,
.decrypt = sun4i_ss_ecb_des_decrypt,
}
}
},
{ .type = CRYPTO_ALG_TYPE_ABLKCIPHER,
.alg.crypto = {
.cra_name = "cbc(des3_ede)",
.cra_driver_name = "cbc-des3-sun4i-ss",
.cra_priority = 300,
.cra_blocksize = DES3_EDE_BLOCK_SIZE,
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER,
.cra_ctxsize = sizeof(struct sun4i_req_ctx),
.cra_module = THIS_MODULE,
.cra_alignmask = 3,
.cra_type = &crypto_ablkcipher_type,
.cra_init = sun4i_ss_cipher_init,
.cra_u.ablkcipher = {
.min_keysize = DES3_EDE_KEY_SIZE,
.max_keysize = DES3_EDE_KEY_SIZE,
.ivsize = DES3_EDE_BLOCK_SIZE,
.setkey = sun4i_ss_des3_setkey,
.encrypt = sun4i_ss_cbc_des3_encrypt,
.decrypt = sun4i_ss_cbc_des3_decrypt,
}
}
},
{ .type = CRYPTO_ALG_TYPE_ABLKCIPHER,
.alg.crypto = {
.cra_name = "ecb(des3_ede)",
.cra_driver_name = "ecb-des3-sun4i-ss",
.cra_priority = 300,
.cra_blocksize = DES3_EDE_BLOCK_SIZE,
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER,
.cra_ctxsize = sizeof(struct sun4i_req_ctx),
.cra_module = THIS_MODULE,
.cra_alignmask = 3,
.cra_type = &crypto_ablkcipher_type,
.cra_init = sun4i_ss_cipher_init,
.cra_u.ablkcipher = {
.min_keysize = DES3_EDE_KEY_SIZE,
.max_keysize = DES3_EDE_KEY_SIZE,
.ivsize = DES3_EDE_BLOCK_SIZE,
.setkey = sun4i_ss_des3_setkey,
.encrypt = sun4i_ss_ecb_des3_encrypt,
.decrypt = sun4i_ss_ecb_des3_decrypt,
}
}
},
};
static int sun4i_ss_probe(struct platform_device *pdev)
{
struct resource *res;
u32 v;
int err, i;
unsigned long cr;
const unsigned long cr_ahb = 24 * 1000 * 1000;
const unsigned long cr_mod = 150 * 1000 * 1000;
struct sun4i_ss_ctx *ss;
if (!pdev->dev.of_node)
return -ENODEV;
ss = devm_kzalloc(&pdev->dev, sizeof(*ss), GFP_KERNEL);
if (!ss)
return -ENOMEM;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
ss->base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(ss->base)) {
dev_err(&pdev->dev, "Cannot request MMIO\n");
return PTR_ERR(ss->base);
}
ss->ssclk = devm_clk_get(&pdev->dev, "mod");
if (IS_ERR(ss->ssclk)) {
err = PTR_ERR(ss->ssclk);
dev_err(&pdev->dev, "Cannot get SS clock err=%d\n", err);
return err;
}
dev_dbg(&pdev->dev, "clock ss acquired\n");
ss->busclk = devm_clk_get(&pdev->dev, "ahb");
if (IS_ERR(ss->busclk)) {
err = PTR_ERR(ss->busclk);
dev_err(&pdev->dev, "Cannot get AHB SS clock err=%d\n", err);
return err;
}
dev_dbg(&pdev->dev, "clock ahb_ss acquired\n");
ss->reset = devm_reset_control_get_optional(&pdev->dev, "ahb");
if (IS_ERR(ss->reset)) {
if (PTR_ERR(ss->reset) == -EPROBE_DEFER)
return PTR_ERR(ss->reset);
dev_info(&pdev->dev, "no reset control found\n");
ss->reset = NULL;
}
/* Enable both clocks */
err = clk_prepare_enable(ss->busclk);
if (err != 0) {
dev_err(&pdev->dev, "Cannot prepare_enable busclk\n");
return err;
}
err = clk_prepare_enable(ss->ssclk);
if (err != 0) {
dev_err(&pdev->dev, "Cannot prepare_enable ssclk\n");
goto error_ssclk;
}
/*
* Check that clock have the correct rates given in the datasheet
* Try to set the clock to the maximum allowed
*/
err = clk_set_rate(ss->ssclk, cr_mod);
if (err != 0) {
dev_err(&pdev->dev, "Cannot set clock rate to ssclk\n");
goto error_clk;
}
/* Deassert reset if we have a reset control */
if (ss->reset) {
err = reset_control_deassert(ss->reset);
if (err) {
dev_err(&pdev->dev, "Cannot deassert reset control\n");
goto error_clk;
}
}
/*
* The only impact on clocks below requirement are bad performance,
* so do not print "errors"
* warn on Overclocked clocks
*/
cr = clk_get_rate(ss->busclk);
if (cr >= cr_ahb)
dev_dbg(&pdev->dev, "Clock bus %lu (%lu MHz) (must be >= %lu)\n",
cr, cr / 1000000, cr_ahb);
else
dev_warn(&pdev->dev, "Clock bus %lu (%lu MHz) (must be >= %lu)\n",
cr, cr / 1000000, cr_ahb);
cr = clk_get_rate(ss->ssclk);
if (cr <= cr_mod)
if (cr < cr_mod)
dev_warn(&pdev->dev, "Clock ss %lu (%lu MHz) (must be <= %lu)\n",
cr, cr / 1000000, cr_mod);
else
dev_dbg(&pdev->dev, "Clock ss %lu (%lu MHz) (must be <= %lu)\n",
cr, cr / 1000000, cr_mod);
else
dev_warn(&pdev->dev, "Clock ss is at %lu (%lu MHz) (must be <= %lu)\n",
cr, cr / 1000000, cr_mod);
/*
* Datasheet named it "Die Bonding ID"
* I expect to be a sort of Security System Revision number.
* Since the A80 seems to have an other version of SS
* this info could be useful
*/
writel(SS_ENABLED, ss->base + SS_CTL);
v = readl(ss->base + SS_CTL);
v >>= 16;
v &= 0x07;
dev_info(&pdev->dev, "Die ID %d\n", v);
writel(0, ss->base + SS_CTL);
ss->dev = &pdev->dev;
spin_lock_init(&ss->slock);
for (i = 0; i < ARRAY_SIZE(ss_algs); i++) {
ss_algs[i].ss = ss;
switch (ss_algs[i].type) {
case CRYPTO_ALG_TYPE_ABLKCIPHER:
err = crypto_register_alg(&ss_algs[i].alg.crypto);
if (err != 0) {
dev_err(ss->dev, "Fail to register %s\n",
ss_algs[i].alg.crypto.cra_name);
goto error_alg;
}
break;
case CRYPTO_ALG_TYPE_AHASH:
err = crypto_register_ahash(&ss_algs[i].alg.hash);
if (err != 0) {
dev_err(ss->dev, "Fail to register %s\n",
ss_algs[i].alg.hash.halg.base.cra_name);
goto error_alg;
}
break;
}
}
platform_set_drvdata(pdev, ss);
return 0;
error_alg:
i--;
for (; i >= 0; i--) {
switch (ss_algs[i].type) {
case CRYPTO_ALG_TYPE_ABLKCIPHER:
crypto_unregister_alg(&ss_algs[i].alg.crypto);
break;
case CRYPTO_ALG_TYPE_AHASH:
crypto_unregister_ahash(&ss_algs[i].alg.hash);
break;
}
}
if (ss->reset)
reset_control_assert(ss->reset);
error_clk:
clk_disable_unprepare(ss->ssclk);
error_ssclk:
clk_disable_unprepare(ss->busclk);
return err;
}
static int sun4i_ss_remove(struct platform_device *pdev)
{
int i;
struct sun4i_ss_ctx *ss = platform_get_drvdata(pdev);
for (i = 0; i < ARRAY_SIZE(ss_algs); i++) {
switch (ss_algs[i].type) {
case CRYPTO_ALG_TYPE_ABLKCIPHER:
crypto_unregister_alg(&ss_algs[i].alg.crypto);
break;
case CRYPTO_ALG_TYPE_AHASH:
crypto_unregister_ahash(&ss_algs[i].alg.hash);
break;
}
}
writel(0, ss->base + SS_CTL);
if (ss->reset)
reset_control_assert(ss->reset);
clk_disable_unprepare(ss->busclk);
clk_disable_unprepare(ss->ssclk);
return 0;
}
static const struct of_device_id a20ss_crypto_of_match_table[] = {
{ .compatible = "allwinner,sun4i-a10-crypto" },
{}
};
MODULE_DEVICE_TABLE(of, a20ss_crypto_of_match_table);
static struct platform_driver sun4i_ss_driver = {
.probe = sun4i_ss_probe,
.remove = sun4i_ss_remove,
.driver = {
.name = "sun4i-ss",
.of_match_table = a20ss_crypto_of_match_table,
},
};
module_platform_driver(sun4i_ss_driver);
MODULE_DESCRIPTION("Allwinner Security System cryptographic accelerator");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Corentin LABBE <clabbe.montjoie@gmail.com>");
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