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![Rahul Pathak](/assets/img/avatar_default.png)
Removed unused variable "err" and directly return "0" Reported by coccicheck - ./drivers/crypto/omap-aes.c:542:5-8: Unneeded variable: "err". Return "0" on line 551 ./drivers/crypto/omap-des.c:530:5-8: Unneeded variable: "err". Return "0" on line 539 Signed-off-by: Rahul Pathak <rpathak@visteon.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
1230 lines
29 KiB
C
1230 lines
29 KiB
C
/*
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* Support for OMAP DES and Triple DES HW acceleration.
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*
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* Copyright (c) 2013 Texas Instruments Incorporated
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* Author: Joel Fernandes <joelf@ti.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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*
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*/
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#define pr_fmt(fmt) "%s: " fmt, __func__
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#ifdef DEBUG
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#define prn(num) printk(#num "=%d\n", num)
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#define prx(num) printk(#num "=%x\n", num)
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#else
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#define prn(num) do { } while (0)
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#define prx(num) do { } while (0)
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#endif
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#include <linux/err.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/platform_device.h>
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#include <linux/scatterlist.h>
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#include <linux/dma-mapping.h>
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#include <linux/dmaengine.h>
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#include <linux/omap-dma.h>
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#include <linux/pm_runtime.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/of_address.h>
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#include <linux/io.h>
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#include <linux/crypto.h>
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#include <linux/interrupt.h>
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#include <crypto/scatterwalk.h>
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#include <crypto/des.h>
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#define DST_MAXBURST 2
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#define DES_BLOCK_WORDS (DES_BLOCK_SIZE >> 2)
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#define _calc_walked(inout) (dd->inout##_walk.offset - dd->inout##_sg->offset)
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#define DES_REG_KEY(dd, x) ((dd)->pdata->key_ofs - \
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((x ^ 0x01) * 0x04))
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#define DES_REG_IV(dd, x) ((dd)->pdata->iv_ofs + ((x) * 0x04))
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#define DES_REG_CTRL(dd) ((dd)->pdata->ctrl_ofs)
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#define DES_REG_CTRL_CBC BIT(4)
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#define DES_REG_CTRL_TDES BIT(3)
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#define DES_REG_CTRL_DIRECTION BIT(2)
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#define DES_REG_CTRL_INPUT_READY BIT(1)
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#define DES_REG_CTRL_OUTPUT_READY BIT(0)
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#define DES_REG_DATA_N(dd, x) ((dd)->pdata->data_ofs + ((x) * 0x04))
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#define DES_REG_REV(dd) ((dd)->pdata->rev_ofs)
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#define DES_REG_MASK(dd) ((dd)->pdata->mask_ofs)
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#define DES_REG_LENGTH_N(x) (0x24 + ((x) * 0x04))
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#define DES_REG_IRQ_STATUS(dd) ((dd)->pdata->irq_status_ofs)
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#define DES_REG_IRQ_ENABLE(dd) ((dd)->pdata->irq_enable_ofs)
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#define DES_REG_IRQ_DATA_IN BIT(1)
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#define DES_REG_IRQ_DATA_OUT BIT(2)
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#define FLAGS_MODE_MASK 0x000f
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#define FLAGS_ENCRYPT BIT(0)
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#define FLAGS_CBC BIT(1)
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#define FLAGS_INIT BIT(4)
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#define FLAGS_BUSY BIT(6)
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struct omap_des_ctx {
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struct omap_des_dev *dd;
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int keylen;
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u32 key[(3 * DES_KEY_SIZE) / sizeof(u32)];
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unsigned long flags;
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};
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struct omap_des_reqctx {
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unsigned long mode;
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};
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#define OMAP_DES_QUEUE_LENGTH 1
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#define OMAP_DES_CACHE_SIZE 0
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struct omap_des_algs_info {
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struct crypto_alg *algs_list;
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unsigned int size;
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unsigned int registered;
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};
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struct omap_des_pdata {
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struct omap_des_algs_info *algs_info;
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unsigned int algs_info_size;
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void (*trigger)(struct omap_des_dev *dd, int length);
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u32 key_ofs;
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u32 iv_ofs;
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u32 ctrl_ofs;
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u32 data_ofs;
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u32 rev_ofs;
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u32 mask_ofs;
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u32 irq_enable_ofs;
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u32 irq_status_ofs;
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u32 dma_enable_in;
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u32 dma_enable_out;
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u32 dma_start;
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u32 major_mask;
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u32 major_shift;
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u32 minor_mask;
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u32 minor_shift;
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};
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struct omap_des_dev {
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struct list_head list;
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unsigned long phys_base;
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void __iomem *io_base;
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struct omap_des_ctx *ctx;
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struct device *dev;
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unsigned long flags;
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int err;
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/* spinlock used for queues */
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spinlock_t lock;
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struct crypto_queue queue;
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struct tasklet_struct done_task;
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struct tasklet_struct queue_task;
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struct ablkcipher_request *req;
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/*
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* total is used by PIO mode for book keeping so introduce
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* variable total_save as need it to calc page_order
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*/
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size_t total;
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size_t total_save;
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struct scatterlist *in_sg;
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struct scatterlist *out_sg;
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/* Buffers for copying for unaligned cases */
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struct scatterlist in_sgl;
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struct scatterlist out_sgl;
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struct scatterlist *orig_out;
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int sgs_copied;
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struct scatter_walk in_walk;
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struct scatter_walk out_walk;
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int dma_in;
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struct dma_chan *dma_lch_in;
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int dma_out;
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struct dma_chan *dma_lch_out;
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int in_sg_len;
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int out_sg_len;
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int pio_only;
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const struct omap_des_pdata *pdata;
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};
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/* keep registered devices data here */
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static LIST_HEAD(dev_list);
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static DEFINE_SPINLOCK(list_lock);
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#ifdef DEBUG
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#define omap_des_read(dd, offset) \
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({ \
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int _read_ret; \
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_read_ret = __raw_readl(dd->io_base + offset); \
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pr_err("omap_des_read(" #offset "=%#x)= %#x\n", \
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offset, _read_ret); \
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_read_ret; \
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})
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#else
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static inline u32 omap_des_read(struct omap_des_dev *dd, u32 offset)
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{
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return __raw_readl(dd->io_base + offset);
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}
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#endif
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#ifdef DEBUG
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#define omap_des_write(dd, offset, value) \
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do { \
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pr_err("omap_des_write(" #offset "=%#x) value=%#x\n", \
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offset, value); \
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__raw_writel(value, dd->io_base + offset); \
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} while (0)
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#else
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static inline void omap_des_write(struct omap_des_dev *dd, u32 offset,
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u32 value)
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{
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__raw_writel(value, dd->io_base + offset);
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}
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#endif
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static inline void omap_des_write_mask(struct omap_des_dev *dd, u32 offset,
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u32 value, u32 mask)
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{
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u32 val;
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val = omap_des_read(dd, offset);
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val &= ~mask;
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val |= value;
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omap_des_write(dd, offset, val);
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}
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static void omap_des_write_n(struct omap_des_dev *dd, u32 offset,
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u32 *value, int count)
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{
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for (; count--; value++, offset += 4)
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omap_des_write(dd, offset, *value);
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}
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static int omap_des_hw_init(struct omap_des_dev *dd)
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{
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int err;
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/*
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* clocks are enabled when request starts and disabled when finished.
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* It may be long delays between requests.
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* Device might go to off mode to save power.
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*/
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err = pm_runtime_get_sync(dd->dev);
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if (err < 0) {
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pm_runtime_put_noidle(dd->dev);
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dev_err(dd->dev, "%s: failed to get_sync(%d)\n", __func__, err);
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return err;
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}
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if (!(dd->flags & FLAGS_INIT)) {
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dd->flags |= FLAGS_INIT;
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dd->err = 0;
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}
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return 0;
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}
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static int omap_des_write_ctrl(struct omap_des_dev *dd)
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{
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unsigned int key32;
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int i, err;
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u32 val = 0, mask = 0;
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err = omap_des_hw_init(dd);
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if (err)
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return err;
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key32 = dd->ctx->keylen / sizeof(u32);
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/* it seems a key should always be set even if it has not changed */
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for (i = 0; i < key32; i++) {
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omap_des_write(dd, DES_REG_KEY(dd, i),
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__le32_to_cpu(dd->ctx->key[i]));
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}
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if ((dd->flags & FLAGS_CBC) && dd->req->info)
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omap_des_write_n(dd, DES_REG_IV(dd, 0), dd->req->info, 2);
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if (dd->flags & FLAGS_CBC)
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val |= DES_REG_CTRL_CBC;
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if (dd->flags & FLAGS_ENCRYPT)
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val |= DES_REG_CTRL_DIRECTION;
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if (key32 == 6)
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val |= DES_REG_CTRL_TDES;
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mask |= DES_REG_CTRL_CBC | DES_REG_CTRL_DIRECTION | DES_REG_CTRL_TDES;
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omap_des_write_mask(dd, DES_REG_CTRL(dd), val, mask);
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return 0;
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}
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static void omap_des_dma_trigger_omap4(struct omap_des_dev *dd, int length)
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{
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u32 mask, val;
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omap_des_write(dd, DES_REG_LENGTH_N(0), length);
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val = dd->pdata->dma_start;
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if (dd->dma_lch_out != NULL)
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val |= dd->pdata->dma_enable_out;
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if (dd->dma_lch_in != NULL)
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val |= dd->pdata->dma_enable_in;
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mask = dd->pdata->dma_enable_out | dd->pdata->dma_enable_in |
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dd->pdata->dma_start;
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omap_des_write_mask(dd, DES_REG_MASK(dd), val, mask);
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}
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static void omap_des_dma_stop(struct omap_des_dev *dd)
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{
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u32 mask;
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mask = dd->pdata->dma_enable_out | dd->pdata->dma_enable_in |
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dd->pdata->dma_start;
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omap_des_write_mask(dd, DES_REG_MASK(dd), 0, mask);
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}
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static struct omap_des_dev *omap_des_find_dev(struct omap_des_ctx *ctx)
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{
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struct omap_des_dev *dd = NULL, *tmp;
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spin_lock_bh(&list_lock);
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if (!ctx->dd) {
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list_for_each_entry(tmp, &dev_list, list) {
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/* FIXME: take fist available des core */
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dd = tmp;
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break;
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}
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ctx->dd = dd;
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} else {
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/* already found before */
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dd = ctx->dd;
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}
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spin_unlock_bh(&list_lock);
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return dd;
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}
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static void omap_des_dma_out_callback(void *data)
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{
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struct omap_des_dev *dd = data;
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/* dma_lch_out - completed */
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tasklet_schedule(&dd->done_task);
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}
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static int omap_des_dma_init(struct omap_des_dev *dd)
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{
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int err = -ENOMEM;
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dma_cap_mask_t mask;
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dd->dma_lch_out = NULL;
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dd->dma_lch_in = NULL;
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dma_cap_zero(mask);
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dma_cap_set(DMA_SLAVE, mask);
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dd->dma_lch_in = dma_request_slave_channel_compat(mask,
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omap_dma_filter_fn,
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&dd->dma_in,
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dd->dev, "rx");
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if (!dd->dma_lch_in) {
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dev_err(dd->dev, "Unable to request in DMA channel\n");
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goto err_dma_in;
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}
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dd->dma_lch_out = dma_request_slave_channel_compat(mask,
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omap_dma_filter_fn,
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&dd->dma_out,
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dd->dev, "tx");
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if (!dd->dma_lch_out) {
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dev_err(dd->dev, "Unable to request out DMA channel\n");
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goto err_dma_out;
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}
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return 0;
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err_dma_out:
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dma_release_channel(dd->dma_lch_in);
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err_dma_in:
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if (err)
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pr_err("error: %d\n", err);
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return err;
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}
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static void omap_des_dma_cleanup(struct omap_des_dev *dd)
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{
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dma_release_channel(dd->dma_lch_out);
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dma_release_channel(dd->dma_lch_in);
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}
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static void sg_copy_buf(void *buf, struct scatterlist *sg,
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unsigned int start, unsigned int nbytes, int out)
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{
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struct scatter_walk walk;
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if (!nbytes)
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return;
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scatterwalk_start(&walk, sg);
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scatterwalk_advance(&walk, start);
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scatterwalk_copychunks(buf, &walk, nbytes, out);
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scatterwalk_done(&walk, out, 0);
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}
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static int omap_des_crypt_dma(struct crypto_tfm *tfm,
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struct scatterlist *in_sg, struct scatterlist *out_sg,
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int in_sg_len, int out_sg_len)
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{
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struct omap_des_ctx *ctx = crypto_tfm_ctx(tfm);
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struct omap_des_dev *dd = ctx->dd;
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struct dma_async_tx_descriptor *tx_in, *tx_out;
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struct dma_slave_config cfg;
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int ret;
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if (dd->pio_only) {
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scatterwalk_start(&dd->in_walk, dd->in_sg);
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scatterwalk_start(&dd->out_walk, dd->out_sg);
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/* Enable DATAIN interrupt and let it take
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care of the rest */
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omap_des_write(dd, DES_REG_IRQ_ENABLE(dd), 0x2);
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return 0;
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}
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dma_sync_sg_for_device(dd->dev, dd->in_sg, in_sg_len, DMA_TO_DEVICE);
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memset(&cfg, 0, sizeof(cfg));
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cfg.src_addr = dd->phys_base + DES_REG_DATA_N(dd, 0);
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cfg.dst_addr = dd->phys_base + DES_REG_DATA_N(dd, 0);
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cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
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cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
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cfg.src_maxburst = DST_MAXBURST;
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cfg.dst_maxburst = DST_MAXBURST;
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/* IN */
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ret = dmaengine_slave_config(dd->dma_lch_in, &cfg);
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if (ret) {
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dev_err(dd->dev, "can't configure IN dmaengine slave: %d\n",
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ret);
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return ret;
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}
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tx_in = dmaengine_prep_slave_sg(dd->dma_lch_in, in_sg, in_sg_len,
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DMA_MEM_TO_DEV,
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DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
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if (!tx_in) {
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dev_err(dd->dev, "IN prep_slave_sg() failed\n");
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return -EINVAL;
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}
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/* No callback necessary */
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tx_in->callback_param = dd;
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/* OUT */
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ret = dmaengine_slave_config(dd->dma_lch_out, &cfg);
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if (ret) {
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dev_err(dd->dev, "can't configure OUT dmaengine slave: %d\n",
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ret);
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return ret;
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}
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tx_out = dmaengine_prep_slave_sg(dd->dma_lch_out, out_sg, out_sg_len,
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DMA_DEV_TO_MEM,
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DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
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if (!tx_out) {
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dev_err(dd->dev, "OUT prep_slave_sg() failed\n");
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return -EINVAL;
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}
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tx_out->callback = omap_des_dma_out_callback;
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tx_out->callback_param = dd;
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dmaengine_submit(tx_in);
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dmaengine_submit(tx_out);
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dma_async_issue_pending(dd->dma_lch_in);
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dma_async_issue_pending(dd->dma_lch_out);
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/* start DMA */
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dd->pdata->trigger(dd, dd->total);
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return 0;
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}
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static int omap_des_crypt_dma_start(struct omap_des_dev *dd)
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{
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struct crypto_tfm *tfm = crypto_ablkcipher_tfm(
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crypto_ablkcipher_reqtfm(dd->req));
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int err;
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pr_debug("total: %d\n", dd->total);
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if (!dd->pio_only) {
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err = dma_map_sg(dd->dev, dd->in_sg, dd->in_sg_len,
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DMA_TO_DEVICE);
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if (!err) {
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dev_err(dd->dev, "dma_map_sg() error\n");
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return -EINVAL;
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}
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err = dma_map_sg(dd->dev, dd->out_sg, dd->out_sg_len,
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DMA_FROM_DEVICE);
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if (!err) {
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dev_err(dd->dev, "dma_map_sg() error\n");
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return -EINVAL;
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}
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}
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|
|
err = omap_des_crypt_dma(tfm, dd->in_sg, dd->out_sg, dd->in_sg_len,
|
|
dd->out_sg_len);
|
|
if (err && !dd->pio_only) {
|
|
dma_unmap_sg(dd->dev, dd->in_sg, dd->in_sg_len, DMA_TO_DEVICE);
|
|
dma_unmap_sg(dd->dev, dd->out_sg, dd->out_sg_len,
|
|
DMA_FROM_DEVICE);
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static void omap_des_finish_req(struct omap_des_dev *dd, int err)
|
|
{
|
|
struct ablkcipher_request *req = dd->req;
|
|
|
|
pr_debug("err: %d\n", err);
|
|
|
|
pm_runtime_put(dd->dev);
|
|
dd->flags &= ~FLAGS_BUSY;
|
|
|
|
req->base.complete(&req->base, err);
|
|
}
|
|
|
|
static int omap_des_crypt_dma_stop(struct omap_des_dev *dd)
|
|
{
|
|
pr_debug("total: %d\n", dd->total);
|
|
|
|
omap_des_dma_stop(dd);
|
|
|
|
dmaengine_terminate_all(dd->dma_lch_in);
|
|
dmaengine_terminate_all(dd->dma_lch_out);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int omap_des_copy_needed(struct scatterlist *sg)
|
|
{
|
|
while (sg) {
|
|
if (!IS_ALIGNED(sg->offset, 4))
|
|
return -1;
|
|
if (!IS_ALIGNED(sg->length, DES_BLOCK_SIZE))
|
|
return -1;
|
|
sg = sg_next(sg);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int omap_des_copy_sgs(struct omap_des_dev *dd)
|
|
{
|
|
void *buf_in, *buf_out;
|
|
int pages;
|
|
|
|
pages = dd->total >> PAGE_SHIFT;
|
|
|
|
if (dd->total & (PAGE_SIZE-1))
|
|
pages++;
|
|
|
|
BUG_ON(!pages);
|
|
|
|
buf_in = (void *)__get_free_pages(GFP_ATOMIC, pages);
|
|
buf_out = (void *)__get_free_pages(GFP_ATOMIC, pages);
|
|
|
|
if (!buf_in || !buf_out) {
|
|
pr_err("Couldn't allocated pages for unaligned cases.\n");
|
|
return -1;
|
|
}
|
|
|
|
dd->orig_out = dd->out_sg;
|
|
|
|
sg_copy_buf(buf_in, dd->in_sg, 0, dd->total, 0);
|
|
|
|
sg_init_table(&dd->in_sgl, 1);
|
|
sg_set_buf(&dd->in_sgl, buf_in, dd->total);
|
|
dd->in_sg = &dd->in_sgl;
|
|
|
|
sg_init_table(&dd->out_sgl, 1);
|
|
sg_set_buf(&dd->out_sgl, buf_out, dd->total);
|
|
dd->out_sg = &dd->out_sgl;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int omap_des_handle_queue(struct omap_des_dev *dd,
|
|
struct ablkcipher_request *req)
|
|
{
|
|
struct crypto_async_request *async_req, *backlog;
|
|
struct omap_des_ctx *ctx;
|
|
struct omap_des_reqctx *rctx;
|
|
unsigned long flags;
|
|
int err, ret = 0;
|
|
|
|
spin_lock_irqsave(&dd->lock, flags);
|
|
if (req)
|
|
ret = ablkcipher_enqueue_request(&dd->queue, req);
|
|
if (dd->flags & FLAGS_BUSY) {
|
|
spin_unlock_irqrestore(&dd->lock, flags);
|
|
return ret;
|
|
}
|
|
backlog = crypto_get_backlog(&dd->queue);
|
|
async_req = crypto_dequeue_request(&dd->queue);
|
|
if (async_req)
|
|
dd->flags |= FLAGS_BUSY;
|
|
spin_unlock_irqrestore(&dd->lock, flags);
|
|
|
|
if (!async_req)
|
|
return ret;
|
|
|
|
if (backlog)
|
|
backlog->complete(backlog, -EINPROGRESS);
|
|
|
|
req = ablkcipher_request_cast(async_req);
|
|
|
|
/* assign new request to device */
|
|
dd->req = req;
|
|
dd->total = req->nbytes;
|
|
dd->total_save = req->nbytes;
|
|
dd->in_sg = req->src;
|
|
dd->out_sg = req->dst;
|
|
|
|
if (omap_des_copy_needed(dd->in_sg) ||
|
|
omap_des_copy_needed(dd->out_sg)) {
|
|
if (omap_des_copy_sgs(dd))
|
|
pr_err("Failed to copy SGs for unaligned cases\n");
|
|
dd->sgs_copied = 1;
|
|
} else {
|
|
dd->sgs_copied = 0;
|
|
}
|
|
|
|
dd->in_sg_len = scatterwalk_bytes_sglen(dd->in_sg, dd->total);
|
|
dd->out_sg_len = scatterwalk_bytes_sglen(dd->out_sg, dd->total);
|
|
BUG_ON(dd->in_sg_len < 0 || dd->out_sg_len < 0);
|
|
|
|
rctx = ablkcipher_request_ctx(req);
|
|
ctx = crypto_ablkcipher_ctx(crypto_ablkcipher_reqtfm(req));
|
|
rctx->mode &= FLAGS_MODE_MASK;
|
|
dd->flags = (dd->flags & ~FLAGS_MODE_MASK) | rctx->mode;
|
|
|
|
dd->ctx = ctx;
|
|
ctx->dd = dd;
|
|
|
|
err = omap_des_write_ctrl(dd);
|
|
if (!err)
|
|
err = omap_des_crypt_dma_start(dd);
|
|
if (err) {
|
|
/* des_task will not finish it, so do it here */
|
|
omap_des_finish_req(dd, err);
|
|
tasklet_schedule(&dd->queue_task);
|
|
}
|
|
|
|
return ret; /* return ret, which is enqueue return value */
|
|
}
|
|
|
|
static void omap_des_done_task(unsigned long data)
|
|
{
|
|
struct omap_des_dev *dd = (struct omap_des_dev *)data;
|
|
void *buf_in, *buf_out;
|
|
int pages;
|
|
|
|
pr_debug("enter done_task\n");
|
|
|
|
if (!dd->pio_only) {
|
|
dma_sync_sg_for_device(dd->dev, dd->out_sg, dd->out_sg_len,
|
|
DMA_FROM_DEVICE);
|
|
dma_unmap_sg(dd->dev, dd->in_sg, dd->in_sg_len, DMA_TO_DEVICE);
|
|
dma_unmap_sg(dd->dev, dd->out_sg, dd->out_sg_len,
|
|
DMA_FROM_DEVICE);
|
|
omap_des_crypt_dma_stop(dd);
|
|
}
|
|
|
|
if (dd->sgs_copied) {
|
|
buf_in = sg_virt(&dd->in_sgl);
|
|
buf_out = sg_virt(&dd->out_sgl);
|
|
|
|
sg_copy_buf(buf_out, dd->orig_out, 0, dd->total_save, 1);
|
|
|
|
pages = get_order(dd->total_save);
|
|
free_pages((unsigned long)buf_in, pages);
|
|
free_pages((unsigned long)buf_out, pages);
|
|
}
|
|
|
|
omap_des_finish_req(dd, 0);
|
|
omap_des_handle_queue(dd, NULL);
|
|
|
|
pr_debug("exit\n");
|
|
}
|
|
|
|
static void omap_des_queue_task(unsigned long data)
|
|
{
|
|
struct omap_des_dev *dd = (struct omap_des_dev *)data;
|
|
|
|
omap_des_handle_queue(dd, NULL);
|
|
}
|
|
|
|
static int omap_des_crypt(struct ablkcipher_request *req, unsigned long mode)
|
|
{
|
|
struct omap_des_ctx *ctx = crypto_ablkcipher_ctx(
|
|
crypto_ablkcipher_reqtfm(req));
|
|
struct omap_des_reqctx *rctx = ablkcipher_request_ctx(req);
|
|
struct omap_des_dev *dd;
|
|
|
|
pr_debug("nbytes: %d, enc: %d, cbc: %d\n", req->nbytes,
|
|
!!(mode & FLAGS_ENCRYPT),
|
|
!!(mode & FLAGS_CBC));
|
|
|
|
if (!IS_ALIGNED(req->nbytes, DES_BLOCK_SIZE)) {
|
|
pr_err("request size is not exact amount of DES blocks\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
dd = omap_des_find_dev(ctx);
|
|
if (!dd)
|
|
return -ENODEV;
|
|
|
|
rctx->mode = mode;
|
|
|
|
return omap_des_handle_queue(dd, req);
|
|
}
|
|
|
|
/* ********************** ALG API ************************************ */
|
|
|
|
static int omap_des_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
|
|
unsigned int keylen)
|
|
{
|
|
struct omap_des_ctx *ctx = crypto_ablkcipher_ctx(tfm);
|
|
|
|
if (keylen != DES_KEY_SIZE && keylen != (3*DES_KEY_SIZE))
|
|
return -EINVAL;
|
|
|
|
pr_debug("enter, keylen: %d\n", keylen);
|
|
|
|
memcpy(ctx->key, key, keylen);
|
|
ctx->keylen = keylen;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int omap_des_ecb_encrypt(struct ablkcipher_request *req)
|
|
{
|
|
return omap_des_crypt(req, FLAGS_ENCRYPT);
|
|
}
|
|
|
|
static int omap_des_ecb_decrypt(struct ablkcipher_request *req)
|
|
{
|
|
return omap_des_crypt(req, 0);
|
|
}
|
|
|
|
static int omap_des_cbc_encrypt(struct ablkcipher_request *req)
|
|
{
|
|
return omap_des_crypt(req, FLAGS_ENCRYPT | FLAGS_CBC);
|
|
}
|
|
|
|
static int omap_des_cbc_decrypt(struct ablkcipher_request *req)
|
|
{
|
|
return omap_des_crypt(req, FLAGS_CBC);
|
|
}
|
|
|
|
static int omap_des_cra_init(struct crypto_tfm *tfm)
|
|
{
|
|
pr_debug("enter\n");
|
|
|
|
tfm->crt_ablkcipher.reqsize = sizeof(struct omap_des_reqctx);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void omap_des_cra_exit(struct crypto_tfm *tfm)
|
|
{
|
|
pr_debug("enter\n");
|
|
}
|
|
|
|
/* ********************** ALGS ************************************ */
|
|
|
|
static struct crypto_alg algs_ecb_cbc[] = {
|
|
{
|
|
.cra_name = "ecb(des)",
|
|
.cra_driver_name = "ecb-des-omap",
|
|
.cra_priority = 100,
|
|
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
|
|
CRYPTO_ALG_KERN_DRIVER_ONLY |
|
|
CRYPTO_ALG_ASYNC,
|
|
.cra_blocksize = DES_BLOCK_SIZE,
|
|
.cra_ctxsize = sizeof(struct omap_des_ctx),
|
|
.cra_alignmask = 0,
|
|
.cra_type = &crypto_ablkcipher_type,
|
|
.cra_module = THIS_MODULE,
|
|
.cra_init = omap_des_cra_init,
|
|
.cra_exit = omap_des_cra_exit,
|
|
.cra_u.ablkcipher = {
|
|
.min_keysize = DES_KEY_SIZE,
|
|
.max_keysize = DES_KEY_SIZE,
|
|
.setkey = omap_des_setkey,
|
|
.encrypt = omap_des_ecb_encrypt,
|
|
.decrypt = omap_des_ecb_decrypt,
|
|
}
|
|
},
|
|
{
|
|
.cra_name = "cbc(des)",
|
|
.cra_driver_name = "cbc-des-omap",
|
|
.cra_priority = 100,
|
|
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
|
|
CRYPTO_ALG_KERN_DRIVER_ONLY |
|
|
CRYPTO_ALG_ASYNC,
|
|
.cra_blocksize = DES_BLOCK_SIZE,
|
|
.cra_ctxsize = sizeof(struct omap_des_ctx),
|
|
.cra_alignmask = 0,
|
|
.cra_type = &crypto_ablkcipher_type,
|
|
.cra_module = THIS_MODULE,
|
|
.cra_init = omap_des_cra_init,
|
|
.cra_exit = omap_des_cra_exit,
|
|
.cra_u.ablkcipher = {
|
|
.min_keysize = DES_KEY_SIZE,
|
|
.max_keysize = DES_KEY_SIZE,
|
|
.ivsize = DES_BLOCK_SIZE,
|
|
.setkey = omap_des_setkey,
|
|
.encrypt = omap_des_cbc_encrypt,
|
|
.decrypt = omap_des_cbc_decrypt,
|
|
}
|
|
},
|
|
{
|
|
.cra_name = "ecb(des3_ede)",
|
|
.cra_driver_name = "ecb-des3-omap",
|
|
.cra_priority = 100,
|
|
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
|
|
CRYPTO_ALG_KERN_DRIVER_ONLY |
|
|
CRYPTO_ALG_ASYNC,
|
|
.cra_blocksize = DES_BLOCK_SIZE,
|
|
.cra_ctxsize = sizeof(struct omap_des_ctx),
|
|
.cra_alignmask = 0,
|
|
.cra_type = &crypto_ablkcipher_type,
|
|
.cra_module = THIS_MODULE,
|
|
.cra_init = omap_des_cra_init,
|
|
.cra_exit = omap_des_cra_exit,
|
|
.cra_u.ablkcipher = {
|
|
.min_keysize = 3*DES_KEY_SIZE,
|
|
.max_keysize = 3*DES_KEY_SIZE,
|
|
.setkey = omap_des_setkey,
|
|
.encrypt = omap_des_ecb_encrypt,
|
|
.decrypt = omap_des_ecb_decrypt,
|
|
}
|
|
},
|
|
{
|
|
.cra_name = "cbc(des3_ede)",
|
|
.cra_driver_name = "cbc-des3-omap",
|
|
.cra_priority = 100,
|
|
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
|
|
CRYPTO_ALG_KERN_DRIVER_ONLY |
|
|
CRYPTO_ALG_ASYNC,
|
|
.cra_blocksize = DES_BLOCK_SIZE,
|
|
.cra_ctxsize = sizeof(struct omap_des_ctx),
|
|
.cra_alignmask = 0,
|
|
.cra_type = &crypto_ablkcipher_type,
|
|
.cra_module = THIS_MODULE,
|
|
.cra_init = omap_des_cra_init,
|
|
.cra_exit = omap_des_cra_exit,
|
|
.cra_u.ablkcipher = {
|
|
.min_keysize = 3*DES_KEY_SIZE,
|
|
.max_keysize = 3*DES_KEY_SIZE,
|
|
.ivsize = DES_BLOCK_SIZE,
|
|
.setkey = omap_des_setkey,
|
|
.encrypt = omap_des_cbc_encrypt,
|
|
.decrypt = omap_des_cbc_decrypt,
|
|
}
|
|
}
|
|
};
|
|
|
|
static struct omap_des_algs_info omap_des_algs_info_ecb_cbc[] = {
|
|
{
|
|
.algs_list = algs_ecb_cbc,
|
|
.size = ARRAY_SIZE(algs_ecb_cbc),
|
|
},
|
|
};
|
|
|
|
#ifdef CONFIG_OF
|
|
static const struct omap_des_pdata omap_des_pdata_omap4 = {
|
|
.algs_info = omap_des_algs_info_ecb_cbc,
|
|
.algs_info_size = ARRAY_SIZE(omap_des_algs_info_ecb_cbc),
|
|
.trigger = omap_des_dma_trigger_omap4,
|
|
.key_ofs = 0x14,
|
|
.iv_ofs = 0x18,
|
|
.ctrl_ofs = 0x20,
|
|
.data_ofs = 0x28,
|
|
.rev_ofs = 0x30,
|
|
.mask_ofs = 0x34,
|
|
.irq_status_ofs = 0x3c,
|
|
.irq_enable_ofs = 0x40,
|
|
.dma_enable_in = BIT(5),
|
|
.dma_enable_out = BIT(6),
|
|
.major_mask = 0x0700,
|
|
.major_shift = 8,
|
|
.minor_mask = 0x003f,
|
|
.minor_shift = 0,
|
|
};
|
|
|
|
static irqreturn_t omap_des_irq(int irq, void *dev_id)
|
|
{
|
|
struct omap_des_dev *dd = dev_id;
|
|
u32 status, i;
|
|
u32 *src, *dst;
|
|
|
|
status = omap_des_read(dd, DES_REG_IRQ_STATUS(dd));
|
|
if (status & DES_REG_IRQ_DATA_IN) {
|
|
omap_des_write(dd, DES_REG_IRQ_ENABLE(dd), 0x0);
|
|
|
|
BUG_ON(!dd->in_sg);
|
|
|
|
BUG_ON(_calc_walked(in) > dd->in_sg->length);
|
|
|
|
src = sg_virt(dd->in_sg) + _calc_walked(in);
|
|
|
|
for (i = 0; i < DES_BLOCK_WORDS; i++) {
|
|
omap_des_write(dd, DES_REG_DATA_N(dd, i), *src);
|
|
|
|
scatterwalk_advance(&dd->in_walk, 4);
|
|
if (dd->in_sg->length == _calc_walked(in)) {
|
|
dd->in_sg = sg_next(dd->in_sg);
|
|
if (dd->in_sg) {
|
|
scatterwalk_start(&dd->in_walk,
|
|
dd->in_sg);
|
|
src = sg_virt(dd->in_sg) +
|
|
_calc_walked(in);
|
|
}
|
|
} else {
|
|
src++;
|
|
}
|
|
}
|
|
|
|
/* Clear IRQ status */
|
|
status &= ~DES_REG_IRQ_DATA_IN;
|
|
omap_des_write(dd, DES_REG_IRQ_STATUS(dd), status);
|
|
|
|
/* Enable DATA_OUT interrupt */
|
|
omap_des_write(dd, DES_REG_IRQ_ENABLE(dd), 0x4);
|
|
|
|
} else if (status & DES_REG_IRQ_DATA_OUT) {
|
|
omap_des_write(dd, DES_REG_IRQ_ENABLE(dd), 0x0);
|
|
|
|
BUG_ON(!dd->out_sg);
|
|
|
|
BUG_ON(_calc_walked(out) > dd->out_sg->length);
|
|
|
|
dst = sg_virt(dd->out_sg) + _calc_walked(out);
|
|
|
|
for (i = 0; i < DES_BLOCK_WORDS; i++) {
|
|
*dst = omap_des_read(dd, DES_REG_DATA_N(dd, i));
|
|
scatterwalk_advance(&dd->out_walk, 4);
|
|
if (dd->out_sg->length == _calc_walked(out)) {
|
|
dd->out_sg = sg_next(dd->out_sg);
|
|
if (dd->out_sg) {
|
|
scatterwalk_start(&dd->out_walk,
|
|
dd->out_sg);
|
|
dst = sg_virt(dd->out_sg) +
|
|
_calc_walked(out);
|
|
}
|
|
} else {
|
|
dst++;
|
|
}
|
|
}
|
|
|
|
BUG_ON(dd->total < DES_BLOCK_SIZE);
|
|
|
|
dd->total -= DES_BLOCK_SIZE;
|
|
|
|
/* Clear IRQ status */
|
|
status &= ~DES_REG_IRQ_DATA_OUT;
|
|
omap_des_write(dd, DES_REG_IRQ_STATUS(dd), status);
|
|
|
|
if (!dd->total)
|
|
/* All bytes read! */
|
|
tasklet_schedule(&dd->done_task);
|
|
else
|
|
/* Enable DATA_IN interrupt for next block */
|
|
omap_des_write(dd, DES_REG_IRQ_ENABLE(dd), 0x2);
|
|
}
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static const struct of_device_id omap_des_of_match[] = {
|
|
{
|
|
.compatible = "ti,omap4-des",
|
|
.data = &omap_des_pdata_omap4,
|
|
},
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(of, omap_des_of_match);
|
|
|
|
static int omap_des_get_of(struct omap_des_dev *dd,
|
|
struct platform_device *pdev)
|
|
{
|
|
const struct of_device_id *match;
|
|
|
|
match = of_match_device(of_match_ptr(omap_des_of_match), &pdev->dev);
|
|
if (!match) {
|
|
dev_err(&pdev->dev, "no compatible OF match\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
dd->dma_out = -1; /* Dummy value that's unused */
|
|
dd->dma_in = -1; /* Dummy value that's unused */
|
|
dd->pdata = match->data;
|
|
|
|
return 0;
|
|
}
|
|
#else
|
|
static int omap_des_get_of(struct omap_des_dev *dd,
|
|
struct device *dev)
|
|
{
|
|
return -EINVAL;
|
|
}
|
|
#endif
|
|
|
|
static int omap_des_get_pdev(struct omap_des_dev *dd,
|
|
struct platform_device *pdev)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
struct resource *r;
|
|
int err = 0;
|
|
|
|
/* Get the DMA out channel */
|
|
r = platform_get_resource(pdev, IORESOURCE_DMA, 0);
|
|
if (!r) {
|
|
dev_err(dev, "no DMA out resource info\n");
|
|
err = -ENODEV;
|
|
goto err;
|
|
}
|
|
dd->dma_out = r->start;
|
|
|
|
/* Get the DMA in channel */
|
|
r = platform_get_resource(pdev, IORESOURCE_DMA, 1);
|
|
if (!r) {
|
|
dev_err(dev, "no DMA in resource info\n");
|
|
err = -ENODEV;
|
|
goto err;
|
|
}
|
|
dd->dma_in = r->start;
|
|
|
|
/* non-DT devices get pdata from pdev */
|
|
dd->pdata = pdev->dev.platform_data;
|
|
|
|
err:
|
|
return err;
|
|
}
|
|
|
|
static int omap_des_probe(struct platform_device *pdev)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
struct omap_des_dev *dd;
|
|
struct crypto_alg *algp;
|
|
struct resource *res;
|
|
int err = -ENOMEM, i, j, irq = -1;
|
|
u32 reg;
|
|
|
|
dd = devm_kzalloc(dev, sizeof(struct omap_des_dev), GFP_KERNEL);
|
|
if (dd == NULL) {
|
|
dev_err(dev, "unable to alloc data struct.\n");
|
|
goto err_data;
|
|
}
|
|
dd->dev = dev;
|
|
platform_set_drvdata(pdev, dd);
|
|
|
|
spin_lock_init(&dd->lock);
|
|
crypto_init_queue(&dd->queue, OMAP_DES_QUEUE_LENGTH);
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
if (!res) {
|
|
dev_err(dev, "no MEM resource info\n");
|
|
goto err_res;
|
|
}
|
|
|
|
err = (dev->of_node) ? omap_des_get_of(dd, pdev) :
|
|
omap_des_get_pdev(dd, pdev);
|
|
if (err)
|
|
goto err_res;
|
|
|
|
dd->io_base = devm_ioremap_resource(dev, res);
|
|
if (IS_ERR(dd->io_base)) {
|
|
err = PTR_ERR(dd->io_base);
|
|
goto err_res;
|
|
}
|
|
dd->phys_base = res->start;
|
|
|
|
pm_runtime_enable(dev);
|
|
pm_runtime_irq_safe(dev);
|
|
err = pm_runtime_get_sync(dev);
|
|
if (err < 0) {
|
|
pm_runtime_put_noidle(dev);
|
|
dev_err(dd->dev, "%s: failed to get_sync(%d)\n", __func__, err);
|
|
goto err_get;
|
|
}
|
|
|
|
omap_des_dma_stop(dd);
|
|
|
|
reg = omap_des_read(dd, DES_REG_REV(dd));
|
|
|
|
pm_runtime_put_sync(dev);
|
|
|
|
dev_info(dev, "OMAP DES hw accel rev: %u.%u\n",
|
|
(reg & dd->pdata->major_mask) >> dd->pdata->major_shift,
|
|
(reg & dd->pdata->minor_mask) >> dd->pdata->minor_shift);
|
|
|
|
tasklet_init(&dd->done_task, omap_des_done_task, (unsigned long)dd);
|
|
tasklet_init(&dd->queue_task, omap_des_queue_task, (unsigned long)dd);
|
|
|
|
err = omap_des_dma_init(dd);
|
|
if (err && DES_REG_IRQ_STATUS(dd) && DES_REG_IRQ_ENABLE(dd)) {
|
|
dd->pio_only = 1;
|
|
|
|
irq = platform_get_irq(pdev, 0);
|
|
if (irq < 0) {
|
|
dev_err(dev, "can't get IRQ resource\n");
|
|
goto err_irq;
|
|
}
|
|
|
|
err = devm_request_irq(dev, irq, omap_des_irq, 0,
|
|
dev_name(dev), dd);
|
|
if (err) {
|
|
dev_err(dev, "Unable to grab omap-des IRQ\n");
|
|
goto err_irq;
|
|
}
|
|
}
|
|
|
|
|
|
INIT_LIST_HEAD(&dd->list);
|
|
spin_lock(&list_lock);
|
|
list_add_tail(&dd->list, &dev_list);
|
|
spin_unlock(&list_lock);
|
|
|
|
for (i = 0; i < dd->pdata->algs_info_size; i++) {
|
|
for (j = 0; j < dd->pdata->algs_info[i].size; j++) {
|
|
algp = &dd->pdata->algs_info[i].algs_list[j];
|
|
|
|
pr_debug("reg alg: %s\n", algp->cra_name);
|
|
INIT_LIST_HEAD(&algp->cra_list);
|
|
|
|
err = crypto_register_alg(algp);
|
|
if (err)
|
|
goto err_algs;
|
|
|
|
dd->pdata->algs_info[i].registered++;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
err_algs:
|
|
for (i = dd->pdata->algs_info_size - 1; i >= 0; i--)
|
|
for (j = dd->pdata->algs_info[i].registered - 1; j >= 0; j--)
|
|
crypto_unregister_alg(
|
|
&dd->pdata->algs_info[i].algs_list[j]);
|
|
if (!dd->pio_only)
|
|
omap_des_dma_cleanup(dd);
|
|
err_irq:
|
|
tasklet_kill(&dd->done_task);
|
|
tasklet_kill(&dd->queue_task);
|
|
err_get:
|
|
pm_runtime_disable(dev);
|
|
err_res:
|
|
dd = NULL;
|
|
err_data:
|
|
dev_err(dev, "initialization failed.\n");
|
|
return err;
|
|
}
|
|
|
|
static int omap_des_remove(struct platform_device *pdev)
|
|
{
|
|
struct omap_des_dev *dd = platform_get_drvdata(pdev);
|
|
int i, j;
|
|
|
|
if (!dd)
|
|
return -ENODEV;
|
|
|
|
spin_lock(&list_lock);
|
|
list_del(&dd->list);
|
|
spin_unlock(&list_lock);
|
|
|
|
for (i = dd->pdata->algs_info_size - 1; i >= 0; i--)
|
|
for (j = dd->pdata->algs_info[i].registered - 1; j >= 0; j--)
|
|
crypto_unregister_alg(
|
|
&dd->pdata->algs_info[i].algs_list[j]);
|
|
|
|
tasklet_kill(&dd->done_task);
|
|
tasklet_kill(&dd->queue_task);
|
|
omap_des_dma_cleanup(dd);
|
|
pm_runtime_disable(dd->dev);
|
|
dd = NULL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
static int omap_des_suspend(struct device *dev)
|
|
{
|
|
pm_runtime_put_sync(dev);
|
|
return 0;
|
|
}
|
|
|
|
static int omap_des_resume(struct device *dev)
|
|
{
|
|
int err;
|
|
|
|
err = pm_runtime_get_sync(dev);
|
|
if (err < 0) {
|
|
pm_runtime_put_noidle(dev);
|
|
dev_err(dev, "%s: failed to get_sync(%d)\n", __func__, err);
|
|
return err;
|
|
}
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static SIMPLE_DEV_PM_OPS(omap_des_pm_ops, omap_des_suspend, omap_des_resume);
|
|
|
|
static struct platform_driver omap_des_driver = {
|
|
.probe = omap_des_probe,
|
|
.remove = omap_des_remove,
|
|
.driver = {
|
|
.name = "omap-des",
|
|
.pm = &omap_des_pm_ops,
|
|
.of_match_table = of_match_ptr(omap_des_of_match),
|
|
},
|
|
};
|
|
|
|
module_platform_driver(omap_des_driver);
|
|
|
|
MODULE_DESCRIPTION("OMAP DES hw acceleration support.");
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_AUTHOR("Joel Fernandes <joelf@ti.com>");
|