Add core functions for new Realtek crypto device.
Signed-off-by: Markus Stockhausen <markus.stockhausen@xxxxxx>
---
drivers/crypto/realtek/realtek_crypto.c | 472 ++++++++++++++++++++++++
1 file changed, 472 insertions(+)
create mode 100644 drivers/crypto/realtek/realtek_crypto.c
diff --git a/drivers/crypto/realtek/realtek_crypto.c b/drivers/crypto/realtek/realtek_crypto.c
new file mode 100644
index 000000000000..f22d117fd3c6
--- /dev/null
+++ b/drivers/crypto/realtek/realtek_crypto.c
@@ -0,0 +1,472 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Crypto acceleration support for Realtek crypto engine. Based on ideas from
+ * Rockchip & SafeXcel driver plus Realtek OpenWrt RTK.
+ *
+ * Copyright (c) 2022, Markus Stockhausen <markus.stockhausen@xxxxxx>
+ */
+
+#include <crypto/internal/hash.h>
+#include <crypto/internal/skcipher.h>
+#include <linux/delay.h>
+#include <linux/dma-mapping.h>
+#include <linux/module.h>
+#include <linux/of_irq.h>
+#include <linux/platform_device.h>
+
+#include "realtek_crypto.h"
+
+inline int rtcr_inc_src_idx(int idx, int cnt)
+{
+ return (idx + cnt) & (RTCR_SRC_RING_SIZE - 1);
+}
+
+inline int rtcr_inc_dst_idx(int idx, int cnt)
+{
+ return (idx + cnt) & (RTCR_DST_RING_SIZE - 1);
+}
+
+inline int rtcr_inc_buf_idx(int idx, int cnt)
+{
+ return (idx + cnt) & (RTCR_BUF_RING_SIZE - 1);
+}
+
+inline int rtcr_space_plus_pad(int len)
+{
+ return (len + 31) & ~31;
+}
+
+int rtcr_alloc_ring(struct rtcr_crypto_dev *cdev, int srclen, int *srcidx,
+ int *dstidx, int buflen, char **buf)
+{
+ int srcfree, dstfree, buffree, bufidx;
+ int srcalloc = (srclen + 1) & ~1, bufalloc = 0;
+ int ret = -ENOSPC;
+
+ spin_lock(&cdev->ringlock);
+
+ bufidx = cdev->cpu_buf_idx;
+ if (buflen > 0) {
+ bufalloc = rtcr_space_plus_pad(buflen);
+ if (bufidx + bufalloc > RTCR_BUF_RING_SIZE) {
+ if (unlikely(cdev->cpu_buf_idx > bufidx)) {
+ dev_err(cdev->dev, "buffer ring full\n");
+ goto err_nospace;
+ }
+ /* end of buffer is free but too small, skip it */
+ bufidx = 0;
+ }
+ }
+
+ srcfree = rtcr_inc_src_idx(cdev->pp_src_idx - cdev->cpu_src_idx, -1);
+ dstfree = rtcr_inc_dst_idx(cdev->pp_dst_idx - cdev->cpu_dst_idx, -1);
+ buffree = rtcr_inc_buf_idx(cdev->pp_buf_idx - bufidx, -1);
+
+ if (unlikely(srcfree < srcalloc)) {
+ dev_err(cdev->dev, "source ring full\n");
+ goto err_nospace;
+ }
+ if (unlikely(dstfree < 1)) {
+ dev_err(cdev->dev, "destination ring full\n");
+ goto err_nospace;
+ }
+ if (unlikely(buffree < bufalloc)) {
+ dev_err(cdev->dev, "buffer ring full\n");
+ goto err_nospace;
+ }
+
+ *srcidx = cdev->cpu_src_idx;
+ cdev->cpu_src_idx = rtcr_inc_src_idx(cdev->cpu_src_idx, srcalloc);
+
+ *dstidx = cdev->cpu_dst_idx;
+ cdev->cpu_dst_idx = rtcr_inc_dst_idx(cdev->cpu_dst_idx, 1);
+
+ ret = 0;
+ cdev->wbk_ring[*dstidx].len = buflen;
+ if (buflen > 0) {
+ *buf = &cdev->buf_ring[bufidx];
+ cdev->wbk_ring[*dstidx].src = *buf;
+ cdev->cpu_buf_idx = rtcr_inc_buf_idx(bufidx, bufalloc);
+ }
+
+err_nospace:
+ spin_unlock(&cdev->ringlock);
+
+ return ret;
+}
+
+static inline void rtcr_ack_irq(struct rtcr_crypto_dev *cdev)
+{
+ int v = ioread32(cdev->base + RTCR_REG_CMD);
+
+ if (unlikely((v != RTCR_CMD_DDOKIP) && v))
+ dev_err(cdev->dev, "unexpected IRQ result 0x%08x\n", v);
+ v = RTCR_CMD_SDUEIP | RTCR_CMD_SDLEIP | RTCR_CMD_DDUEIP |
+ RTCR_CMD_DDOKIP | RTCR_CMD_DABFIP;
+
+ iowrite32(v, cdev->base + RTCR_REG_CMD);
+}
+
+static void rtcr_done_task(unsigned long data)
+{
+ struct rtcr_crypto_dev *cdev = (struct rtcr_crypto_dev *)data;
+ int stop_src_idx, stop_dst_idx, idx, len;
+ struct scatterlist *sg;
+ unsigned long flags;
+
+ spin_lock_irqsave(&cdev->asiclock, flags);
+ stop_src_idx = cdev->asic_src_idx;
+ stop_dst_idx = cdev->asic_dst_idx;
+ spin_unlock_irqrestore(&cdev->asiclock, flags);
+
+ idx = cdev->pp_dst_idx;
+
+ while (idx != stop_dst_idx) {
+ len = cdev->wbk_ring[idx].len;
+ switch (len) {
+ case RTCR_WB_LEN_SG_DIRECT:
+ /* already written to the destination by the engine */
+ break;
+ case RTCR_WB_LEN_HASH:
+ /* write back hash from destination ring */
+ memcpy(cdev->wbk_ring[idx].dst,
+ cdev->dst_ring[idx].vector,
+ RTCR_HASH_VECTOR_SIZE);
+ break;
+ default:
+ /* write back data from buffer */
+ sg = (struct scatterlist *)cdev->wbk_ring[idx].dst;
+ sg_pcopy_from_buffer(sg, sg_nents(sg),
+ cdev->wbk_ring[idx].src,
+ len, cdev->wbk_ring[idx].off);
+ len = rtcr_space_plus_pad(len);
+ cdev->pp_buf_idx = ((char *)cdev->wbk_ring[idx].src - cdev->buf_ring) + len;
+ }
+
+ cdev->wbk_ring[idx].len = RTCR_WB_LEN_DONE;
+ idx = rtcr_inc_dst_idx(idx, 1);
+ }
+
+ wake_up_all(&cdev->done_queue);
+ cdev->pp_src_idx = stop_src_idx;
+ cdev->pp_dst_idx = stop_dst_idx;
+}
+
+static irqreturn_t rtcr_handle_irq(int irq, void *dev_id)
+{
+ struct rtcr_crypto_dev *cdev = dev_id;
+ u32 p;
+
+ spin_lock(&cdev->asiclock);
+
+ rtcr_ack_irq(cdev);
+ cdev->busy = false;
+
+ p = (u32)phys_to_virt((u32)ioread32(cdev->base + RTCR_REG_SRC));
+ cdev->asic_src_idx = (p - (u32)cdev->src_ring) / RTCR_SRC_DESC_SIZE;
+
+ p = (u32)phys_to_virt((u32)ioread32(cdev->base + RTCR_REG_DST));
+ cdev->asic_dst_idx = (p - (u32)cdev->dst_ring) / RTCR_DST_DESC_SIZE;
+
+ tasklet_schedule(&cdev->done_task);
+ spin_unlock(&cdev->asiclock);
+
+ return IRQ_HANDLED;
+}
+
+void rtcr_add_src_ahash_to_ring(struct rtcr_crypto_dev *cdev, int idx,
+ int opmode, int totallen)
+{
+ struct rtcr_src_desc *src = &cdev->src_ring[idx];
+
+ src->len = totallen;
+ src->opmode = opmode | RTCR_SRC_OP_FS |
+ RTCR_SRC_OP_DUMMY_LEN | RTCR_SRC_OP_OWN_ASIC |
+ RTCR_SRC_OP_CALC_EOR(idx);
+
+ dma_sync_single_for_device(cdev->dev, virt_to_phys(src),
+ RTCR_SRC_DESC_SIZE,
+ DMA_TO_DEVICE);
+}
+
+void rtcr_add_src_skcipher_to_ring(struct rtcr_crypto_dev *cdev, int idx,
+ int opmode, int totallen,
+ struct rtcr_skcipher_ctx *sctx)
+{
+ struct rtcr_src_desc *src = &cdev->src_ring[idx];
+
+ src->len = totallen;
+ if (opmode & RTCR_SRC_OP_KAM_ENC)
+ src->paddr = virt_to_phys(sctx->key_enc);
+ else
+ src->paddr = virt_to_phys(sctx->key_dec);
+
+ src->opmode = RTCR_SRC_OP_FS | RTCR_SRC_OP_OWN_ASIC |
+ RTCR_SRC_OP_MS_CRYPTO | RTCR_SRC_OP_CRYPT_ECB |
+ RTCR_SRC_OP_CALC_EOR(idx) | opmode | sctx->keylen;
+
+ dma_sync_single_for_device(cdev->dev, virt_to_phys(src),
+ RTCR_SRC_DESC_SIZE,
+ DMA_TO_DEVICE);
+}
+
+void rtcr_add_src_to_ring(struct rtcr_crypto_dev *cdev, int idx, void *vaddr,
+ int blocklen, int totallen)
+{
+ struct rtcr_src_desc *src = &cdev->src_ring[idx];
+
+ src->len = totallen;
+ src->paddr = virt_to_phys(vaddr);
+ src->opmode = RTCR_SRC_OP_OWN_ASIC | RTCR_SRC_OP_CALC_EOR(idx) | blocklen;
+
+ dma_sync_single_for_device(cdev->dev, virt_to_phys(src),
+ RTCR_SRC_DESC_SIZE,
+ DMA_BIDIRECTIONAL);
+}
+
+inline void rtcr_add_src_pad_to_ring(struct rtcr_crypto_dev *cdev, int idx, int len)
+{
+ /* align 16 byte source descriptors with 32 byte cache lines */
+ if (!(idx & 1))
+ rtcr_add_src_to_ring(cdev, idx + 1, NULL, 0, len);
+}
+
+void rtcr_add_dst_to_ring(struct rtcr_crypto_dev *cdev, int idx, void *reqdst,
+ int reqlen, void *wbkdst, int wbkoff)
+{
+ struct rtcr_dst_desc *dst = &cdev->dst_ring[idx];
+ struct rtcr_wbk_desc *wbk = &cdev->wbk_ring[idx];
+
+ dst->paddr = virt_to_phys(reqdst);
+ dst->opmode = RTCR_DST_OP_OWN_ASIC | RTCR_DST_OP_CALC_EOR(idx) | reqlen;
+
+ wbk->dst = wbkdst;
+ wbk->off = wbkoff;
+
+ dma_sync_single_for_device(cdev->dev, virt_to_phys(dst),
+ RTCR_DST_DESC_SIZE,
+ DMA_BIDIRECTIONAL);
+}
+
+inline int rtcr_wait_for_request(struct rtcr_crypto_dev *cdev, int idx)
+{
+ int *len = &cdev->wbk_ring[idx].len;
+
+ wait_event(cdev->done_queue, *len == RTCR_WB_LEN_DONE);
+ return 0;
+}
+
+void rtcr_kick_engine(struct rtcr_crypto_dev *cdev)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&cdev->asiclock, flags);
+
+ if (!cdev->busy) {
+ cdev->busy = true;
+ /* engine needs up to 5us to reset poll bit */
+ iowrite32(RTCR_CMD_POLL, cdev->base + RTCR_REG_CMD);
+ }
+
+ spin_unlock_irqrestore(&cdev->asiclock, flags);
+}
+
+static struct rtcr_alg_template *rtcr_algs[] = {
+ &rtcr_ahash_md5,
+ &rtcr_ahash_sha1,
+ &rtcr_skcipher_ecb_aes,
+ &rtcr_skcipher_cbc_aes,
+ &rtcr_skcipher_ctr_aes,
+};
+
+static void rtcr_unregister_algorithms(int end)
+{
+ int i;
+
+ for (i = 0; i < end; i++) {
+ if (rtcr_algs[i]->type == RTCR_ALG_SKCIPHER)
+ crypto_unregister_skcipher(&rtcr_algs[i]->alg.skcipher);
+ else
+ crypto_unregister_ahash(&rtcr_algs[i]->alg.ahash);
+ }
+}
+
+static int rtcr_register_algorithms(struct rtcr_crypto_dev *cdev)
+{
+ int i, ret = 0;
+
+ for (i = 0; i < ARRAY_SIZE(rtcr_algs); i++) {
+ rtcr_algs[i]->cdev = cdev;
+ if (rtcr_algs[i]->type == RTCR_ALG_SKCIPHER)
+ ret = crypto_register_skcipher(&rtcr_algs[i]->alg.skcipher);
+ else {
+ rtcr_algs[i]->alg.ahash.halg.statesize =
+ max(sizeof(struct rtcr_ahash_req),
+ offsetof(struct rtcr_ahash_req, vector) +
+ sizeof(union rtcr_fallback_state));
+ ret = crypto_register_ahash(&rtcr_algs[i]->alg.ahash);
+ }
+ if (ret)
+ goto err_cipher_algs;
+ }
+
+ return 0;
+
+err_cipher_algs:
+ rtcr_unregister_algorithms(i);
+
+ return ret;
+}
+
+static void rtcr_init_engine(struct rtcr_crypto_dev *cdev)
+{
+ int v;
+
+ v = ioread32(cdev->base + RTCR_REG_CMD);
+ v |= RTCR_CMD_SRST;
+ iowrite32(v, cdev->base + RTCR_REG_CMD);
+
+ usleep_range(10000, 20000);
+
+ iowrite32(RTCR_CTR_CKE | RTCR_CTR_SDM16 | RTCR_CTR_DDM16 |
+ RTCR_CTR_SDUEIE | RTCR_CTR_SDLEIE | RTCR_CTR_DDUEIE |
+ RTCR_CTR_DDOKIE | RTCR_CTR_DABFIE, cdev->base + RTCR_REG_CTR);
+
+ rtcr_ack_irq(cdev);
+ usleep_range(10000, 20000);
+}
+
+static void rtcr_exit_engine(struct rtcr_crypto_dev *cdev)
+{
+ iowrite32(0, cdev->base + RTCR_REG_CTR);
+}
+
+static void rtcr_init_rings(struct rtcr_crypto_dev *cdev)
+{
+ phys_addr_t src = virt_to_phys(cdev->src_ring);
+ phys_addr_t dst = virt_to_phys(cdev->dst_ring);
+
+ iowrite32(src, cdev->base + RTCR_REG_SRC);
+ iowrite32(dst, cdev->base + RTCR_REG_DST);
+
+ cdev->asic_dst_idx = cdev->asic_src_idx = 0;
+ cdev->cpu_src_idx = cdev->cpu_dst_idx = cdev->cpu_buf_idx = 0;
+ cdev->pp_src_idx = cdev->pp_dst_idx = cdev->pp_buf_idx = 0;
+}
+
+static int rtcr_crypto_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct rtcr_crypto_dev *cdev;
+ unsigned long flags = 0;
+ struct resource *res;
+ void __iomem *base;
+ int irq, ret;
+
+#ifdef CONFIG_MIPS
+ if ((cpu_dcache_line_size() != 16) && (cpu_dcache_line_size() != 32)) {
+ dev_err(dev, "cache line size not 16 or 32 bytes\n");
+ ret = -EINVAL;
+ goto err_map;
+ }
+#endif
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res) {
+ dev_err(dev, "no IO address given\n");
+ ret = -ENODEV;
+ goto err_map;
+ }
+
+ base = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR_OR_NULL(base)) {
+ dev_err(dev, "failed to map IO address\n");
+ ret = -EINVAL;
+ goto err_map;
+ }
+
+ cdev = devm_kzalloc(dev, sizeof(*cdev), GFP_KERNEL);
+ if (!cdev) {
+ dev_err(dev, "failed to allocate device memory\n");
+ ret = -ENOMEM;
+ goto err_mem;
+ }
+
+ irq = irq_of_parse_and_map(pdev->dev.of_node, 0);
+ if (!irq) {
+ dev_err(dev, "failed to determine device interrupt\n");
+ ret = -EINVAL;
+ goto err_of_irq;
+ }
+
+ if (devm_request_irq(dev, irq, rtcr_handle_irq, flags, "realtek-crypto", cdev)) {
+ dev_err(dev, "failed to request device interrupt\n");
+ ret = -ENXIO;
+ goto err_request_irq;
+ }
+
+ platform_set_drvdata(pdev, cdev);
+ cdev->base = base;
+ cdev->dev = dev;
+ cdev->irq = irq;
+ cdev->pdev = pdev;
+
+ dma_map_single(dev, (void *)empty_zero_page, PAGE_SIZE, DMA_TO_DEVICE);
+
+ init_waitqueue_head(&cdev->done_queue);
+ tasklet_init(&cdev->done_task, rtcr_done_task, (unsigned long)cdev);
+ spin_lock_init(&cdev->ringlock);
+ spin_lock_init(&cdev->asiclock);
+
+ /* Init engine first as it resets the ring pointers */
+ rtcr_init_engine(cdev);
+ rtcr_init_rings(cdev);
+ rtcr_register_algorithms(cdev);
+
+ dev_info(dev, "%d KB buffer, max %d requests of up to %d bytes\n",
+ RTCR_BUF_RING_SIZE / 1024, RTCR_DST_RING_SIZE,
+ RTCR_MAX_REQ_SIZE);
+ dev_info(dev, "ready for AES/SHA1/MD5 crypto acceleration\n");
+
+ return 0;
+
+err_request_irq:
+ irq_dispose_mapping(irq);
+err_of_irq:
+ kfree(cdev);
+err_mem:
+ iounmap(base);
+err_map:
+ return ret;
+}
+
+static int rtcr_crypto_remove(struct platform_device *pdev)
+{
+ struct rtcr_crypto_dev *cdev = platform_get_drvdata(pdev);
+
+ rtcr_exit_engine(cdev);
+ rtcr_unregister_algorithms(ARRAY_SIZE(rtcr_algs));
+ tasklet_kill(&cdev->done_task);
+ return 0;
+}
+
+static const struct of_device_id rtcr_id_table[] = {
+ { .compatible = "realtek,realtek-crypto" },
+ {}
+};
+MODULE_DEVICE_TABLE(of, rtcr_id_table);
+
+static struct platform_driver rtcr_driver = {
+ .probe = rtcr_crypto_probe,
+ .remove = rtcr_crypto_remove,
+ .driver = {
+ .name = "realtek-crypto",
+ .of_match_table = rtcr_id_table,
+ },
+};
+
+module_platform_driver(rtcr_driver);
+
+MODULE_AUTHOR("Markus Stockhausen <markus.stockhausen@xxxxxx>");
+MODULE_DESCRIPTION("Support for Realtek's cryptographic engine");
+MODULE_LICENSE("GPL");
--
2.37.3
