diff options
Diffstat (limited to 'drivers/crypto/rockchip/rk3288_crypto.c')
| -rw-r--r-- | drivers/crypto/rockchip/rk3288_crypto.c | 394 |
1 files changed, 394 insertions, 0 deletions
diff --git a/drivers/crypto/rockchip/rk3288_crypto.c b/drivers/crypto/rockchip/rk3288_crypto.c new file mode 100644 index 000000000..da9c73dce --- /dev/null +++ b/drivers/crypto/rockchip/rk3288_crypto.c @@ -0,0 +1,394 @@ +/* + * Crypto acceleration support for Rockchip RK3288 + * + * Copyright (c) 2015, Fuzhou Rockchip Electronics Co., Ltd + * + * Author: Zain Wang <zain.wang@rock-chips.com> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * Some ideas are from marvell-cesa.c and s5p-sss.c driver. + */ + +#include "rk3288_crypto.h" +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/of.h> +#include <linux/clk.h> +#include <linux/crypto.h> +#include <linux/reset.h> + +static int rk_crypto_enable_clk(struct rk_crypto_info *dev) +{ + int err; + + err = clk_prepare_enable(dev->sclk); + if (err) { + dev_err(dev->dev, "[%s:%d], Couldn't enable clock sclk\n", + __func__, __LINE__); + goto err_return; + } + err = clk_prepare_enable(dev->aclk); + if (err) { + dev_err(dev->dev, "[%s:%d], Couldn't enable clock aclk\n", + __func__, __LINE__); + goto err_aclk; + } + err = clk_prepare_enable(dev->hclk); + if (err) { + dev_err(dev->dev, "[%s:%d], Couldn't enable clock hclk\n", + __func__, __LINE__); + goto err_hclk; + } + err = clk_prepare_enable(dev->dmaclk); + if (err) { + dev_err(dev->dev, "[%s:%d], Couldn't enable clock dmaclk\n", + __func__, __LINE__); + goto err_dmaclk; + } + return err; +err_dmaclk: + clk_disable_unprepare(dev->hclk); +err_hclk: + clk_disable_unprepare(dev->aclk); +err_aclk: + clk_disable_unprepare(dev->sclk); +err_return: + return err; +} + +static void rk_crypto_disable_clk(struct rk_crypto_info *dev) +{ + clk_disable_unprepare(dev->dmaclk); + clk_disable_unprepare(dev->hclk); + clk_disable_unprepare(dev->aclk); + clk_disable_unprepare(dev->sclk); +} + +static int check_alignment(struct scatterlist *sg_src, + struct scatterlist *sg_dst, + int align_mask) +{ + int in, out, align; + + in = IS_ALIGNED((uint32_t)sg_src->offset, 4) && + IS_ALIGNED((uint32_t)sg_src->length, align_mask); + if (!sg_dst) + return in; + out = IS_ALIGNED((uint32_t)sg_dst->offset, 4) && + IS_ALIGNED((uint32_t)sg_dst->length, align_mask); + align = in && out; + + return (align && (sg_src->length == sg_dst->length)); +} + +static int rk_load_data(struct rk_crypto_info *dev, + struct scatterlist *sg_src, + struct scatterlist *sg_dst) +{ + unsigned int count; + + dev->aligned = dev->aligned ? + check_alignment(sg_src, sg_dst, dev->align_size) : + dev->aligned; + if (dev->aligned) { + count = min(dev->left_bytes, sg_src->length); + dev->left_bytes -= count; + + if (!dma_map_sg(dev->dev, sg_src, 1, DMA_TO_DEVICE)) { + dev_err(dev->dev, "[%s:%d] dma_map_sg(src) error\n", + __func__, __LINE__); + return -EINVAL; + } + dev->addr_in = sg_dma_address(sg_src); + + if (sg_dst) { + if (!dma_map_sg(dev->dev, sg_dst, 1, DMA_FROM_DEVICE)) { + dev_err(dev->dev, + "[%s:%d] dma_map_sg(dst) error\n", + __func__, __LINE__); + dma_unmap_sg(dev->dev, sg_src, 1, + DMA_TO_DEVICE); + return -EINVAL; + } + dev->addr_out = sg_dma_address(sg_dst); + } + } else { + count = (dev->left_bytes > PAGE_SIZE) ? + PAGE_SIZE : dev->left_bytes; + + if (!sg_pcopy_to_buffer(dev->first, dev->nents, + dev->addr_vir, count, + dev->total - dev->left_bytes)) { + dev_err(dev->dev, "[%s:%d] pcopy err\n", + __func__, __LINE__); + return -EINVAL; + } + dev->left_bytes -= count; + sg_init_one(&dev->sg_tmp, dev->addr_vir, count); + if (!dma_map_sg(dev->dev, &dev->sg_tmp, 1, DMA_TO_DEVICE)) { + dev_err(dev->dev, "[%s:%d] dma_map_sg(sg_tmp) error\n", + __func__, __LINE__); + return -ENOMEM; + } + dev->addr_in = sg_dma_address(&dev->sg_tmp); + + if (sg_dst) { + if (!dma_map_sg(dev->dev, &dev->sg_tmp, 1, + DMA_FROM_DEVICE)) { + dev_err(dev->dev, + "[%s:%d] dma_map_sg(sg_tmp) error\n", + __func__, __LINE__); + dma_unmap_sg(dev->dev, &dev->sg_tmp, 1, + DMA_TO_DEVICE); + return -ENOMEM; + } + dev->addr_out = sg_dma_address(&dev->sg_tmp); + } + } + dev->count = count; + return 0; +} + +static void rk_unload_data(struct rk_crypto_info *dev) +{ + struct scatterlist *sg_in, *sg_out; + + sg_in = dev->aligned ? dev->sg_src : &dev->sg_tmp; + dma_unmap_sg(dev->dev, sg_in, 1, DMA_TO_DEVICE); + + if (dev->sg_dst) { + sg_out = dev->aligned ? dev->sg_dst : &dev->sg_tmp; + dma_unmap_sg(dev->dev, sg_out, 1, DMA_FROM_DEVICE); + } +} + +static irqreturn_t rk_crypto_irq_handle(int irq, void *dev_id) +{ + struct rk_crypto_info *dev = platform_get_drvdata(dev_id); + u32 interrupt_status; + int err = 0; + + spin_lock(&dev->lock); + interrupt_status = CRYPTO_READ(dev, RK_CRYPTO_INTSTS); + CRYPTO_WRITE(dev, RK_CRYPTO_INTSTS, interrupt_status); + if (interrupt_status & 0x0a) { + dev_warn(dev->dev, "DMA Error\n"); + err = -EFAULT; + } else if (interrupt_status & 0x05) { + err = dev->update(dev); + } + if (err) + dev->complete(dev, err); + spin_unlock(&dev->lock); + return IRQ_HANDLED; +} + +static void rk_crypto_tasklet_cb(unsigned long data) +{ + struct rk_crypto_info *dev = (struct rk_crypto_info *)data; + struct crypto_async_request *async_req, *backlog; + unsigned long flags; + int err = 0; + + spin_lock_irqsave(&dev->lock, flags); + backlog = crypto_get_backlog(&dev->queue); + async_req = crypto_dequeue_request(&dev->queue); + spin_unlock_irqrestore(&dev->lock, flags); + if (!async_req) { + dev_err(dev->dev, "async_req is NULL !!\n"); + return; + } + if (backlog) { + backlog->complete(backlog, -EINPROGRESS); + backlog = NULL; + } + + if (crypto_tfm_alg_type(async_req->tfm) == CRYPTO_ALG_TYPE_ABLKCIPHER) + dev->ablk_req = ablkcipher_request_cast(async_req); + err = dev->start(dev); + if (err) + dev->complete(dev, err); +} + +static struct rk_crypto_tmp *rk_cipher_algs[] = { + &rk_ecb_aes_alg, + &rk_cbc_aes_alg, + &rk_ecb_des_alg, + &rk_cbc_des_alg, + &rk_ecb_des3_ede_alg, + &rk_cbc_des3_ede_alg, +}; + +static int rk_crypto_register(struct rk_crypto_info *crypto_info) +{ + unsigned int i, k; + int err = 0; + + for (i = 0; i < ARRAY_SIZE(rk_cipher_algs); i++) { + rk_cipher_algs[i]->dev = crypto_info; + err = crypto_register_alg(&rk_cipher_algs[i]->alg); + if (err) + goto err_cipher_algs; + } + return 0; + +err_cipher_algs: + for (k = 0; k < i; k++) + crypto_unregister_alg(&rk_cipher_algs[k]->alg); + return err; +} + +static void rk_crypto_unregister(void) +{ + unsigned int i; + + for (i = 0; i < ARRAY_SIZE(rk_cipher_algs); i++) + crypto_unregister_alg(&rk_cipher_algs[i]->alg); +} + +static void rk_crypto_action(void *data) +{ + struct rk_crypto_info *crypto_info = data; + + reset_control_assert(crypto_info->rst); +} + +static const struct of_device_id crypto_of_id_table[] = { + { .compatible = "rockchip,rk3288-crypto" }, + {} +}; +MODULE_DEVICE_TABLE(of, crypto_of_id_table); + +static int rk_crypto_probe(struct platform_device *pdev) +{ + struct resource *res; + struct device *dev = &pdev->dev; + struct rk_crypto_info *crypto_info; + int err = 0; + + crypto_info = devm_kzalloc(&pdev->dev, + sizeof(*crypto_info), GFP_KERNEL); + if (!crypto_info) { + err = -ENOMEM; + goto err_crypto; + } + + crypto_info->rst = devm_reset_control_get(dev, "crypto-rst"); + if (IS_ERR(crypto_info->rst)) { + err = PTR_ERR(crypto_info->rst); + goto err_crypto; + } + + reset_control_assert(crypto_info->rst); + usleep_range(10, 20); + reset_control_deassert(crypto_info->rst); + + err = devm_add_action(dev, rk_crypto_action, crypto_info); + if (err) { + reset_control_assert(crypto_info->rst); + goto err_crypto; + } + + spin_lock_init(&crypto_info->lock); + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + crypto_info->reg = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(crypto_info->reg)) { + err = PTR_ERR(crypto_info->reg); + goto err_crypto; + } + + crypto_info->aclk = devm_clk_get(&pdev->dev, "aclk"); + if (IS_ERR(crypto_info->aclk)) { + err = PTR_ERR(crypto_info->aclk); + goto err_crypto; + } + + crypto_info->hclk = devm_clk_get(&pdev->dev, "hclk"); + if (IS_ERR(crypto_info->hclk)) { + err = PTR_ERR(crypto_info->hclk); + goto err_crypto; + } + + crypto_info->sclk = devm_clk_get(&pdev->dev, "sclk"); + if (IS_ERR(crypto_info->sclk)) { + err = PTR_ERR(crypto_info->sclk); + goto err_crypto; + } + + crypto_info->dmaclk = devm_clk_get(&pdev->dev, "apb_pclk"); + if (IS_ERR(crypto_info->dmaclk)) { + err = PTR_ERR(crypto_info->dmaclk); + goto err_crypto; + } + + crypto_info->irq = platform_get_irq(pdev, 0); + if (crypto_info->irq < 0) { + dev_warn(crypto_info->dev, + "control Interrupt is not available.\n"); + err = crypto_info->irq; + goto err_crypto; + } + + err = devm_request_irq(&pdev->dev, crypto_info->irq, + rk_crypto_irq_handle, IRQF_SHARED, + "rk-crypto", pdev); + + if (err) { + dev_err(crypto_info->dev, "irq request failed.\n"); + goto err_crypto; + } + + crypto_info->dev = &pdev->dev; + platform_set_drvdata(pdev, crypto_info); + + tasklet_init(&crypto_info->crypto_tasklet, + rk_crypto_tasklet_cb, (unsigned long)crypto_info); + crypto_init_queue(&crypto_info->queue, 50); + + crypto_info->enable_clk = rk_crypto_enable_clk; + crypto_info->disable_clk = rk_crypto_disable_clk; + crypto_info->load_data = rk_load_data; + crypto_info->unload_data = rk_unload_data; + + err = rk_crypto_register(crypto_info); + if (err) { + dev_err(dev, "err in register alg"); + goto err_register_alg; + } + + dev_info(dev, "Crypto Accelerator successfully registered\n"); + return 0; + +err_register_alg: + tasklet_kill(&crypto_info->crypto_tasklet); +err_crypto: + return err; +} + +static int rk_crypto_remove(struct platform_device *pdev) +{ + struct rk_crypto_info *crypto_tmp = platform_get_drvdata(pdev); + + rk_crypto_unregister(); + tasklet_kill(&crypto_tmp->crypto_tasklet); + return 0; +} + +static struct platform_driver crypto_driver = { + .probe = rk_crypto_probe, + .remove = rk_crypto_remove, + .driver = { + .name = "rk3288-crypto", + .of_match_table = crypto_of_id_table, + }, +}; + +module_platform_driver(crypto_driver); + +MODULE_AUTHOR("Zain Wang <zain.wang@rock-chips.com>"); +MODULE_DESCRIPTION("Support for Rockchip's cryptographic engine"); +MODULE_LICENSE("GPL"); |