Merge tag 'sh-pfc-for-v5.1-tag2' of git://git.kernel.org/pub/scm/linux/kernel/git...

[mirror_ubuntu-focal-kernel.git] / drivers / crypto / mediatek / mtk-platform.c

/*
 * Driver for EIP97 cryptographic accelerator.
 *
 * Copyright (c) 2016 Ryder Lee <ryder.lee@mediatek.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 */

#include <linux/clk.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include "mtk-platform.h"

#define MTK_BURST_SIZE_MSK              GENMASK(7, 4)
#define MTK_BURST_SIZE(x)               ((x) << 4)
#define MTK_DESC_SIZE(x)                ((x) << 0)
#define MTK_DESC_OFFSET(x)              ((x) << 16)
#define MTK_DESC_FETCH_SIZE(x)          ((x) << 0)
#define MTK_DESC_FETCH_THRESH(x)        ((x) << 16)
#define MTK_DESC_OVL_IRQ_EN             BIT(25)
#define MTK_DESC_ATP_PRESENT            BIT(30)

#define MTK_DFSE_IDLE                   GENMASK(3, 0)
#define MTK_DFSE_THR_CTRL_EN            BIT(30)
#define MTK_DFSE_THR_CTRL_RESET         BIT(31)
#define MTK_DFSE_RING_ID(x)             (((x) >> 12) & GENMASK(3, 0))
#define MTK_DFSE_MIN_DATA(x)            ((x) << 0)
#define MTK_DFSE_MAX_DATA(x)            ((x) << 8)
#define MTK_DFE_MIN_CTRL(x)             ((x) << 16)
#define MTK_DFE_MAX_CTRL(x)             ((x) << 24)

#define MTK_IN_BUF_MIN_THRESH(x)        ((x) << 8)
#define MTK_IN_BUF_MAX_THRESH(x)        ((x) << 12)
#define MTK_OUT_BUF_MIN_THRESH(x)       ((x) << 0)
#define MTK_OUT_BUF_MAX_THRESH(x)       ((x) << 4)
#define MTK_IN_TBUF_SIZE(x)             (((x) >> 4) & GENMASK(3, 0))
#define MTK_IN_DBUF_SIZE(x)             (((x) >> 8) & GENMASK(3, 0))
#define MTK_OUT_DBUF_SIZE(x)            (((x) >> 16) & GENMASK(3, 0))
#define MTK_CMD_FIFO_SIZE(x)            (((x) >> 8) & GENMASK(3, 0))
#define MTK_RES_FIFO_SIZE(x)            (((x) >> 12) & GENMASK(3, 0))

#define MTK_PE_TK_LOC_AVL               BIT(2)
#define MTK_PE_PROC_HELD                BIT(14)
#define MTK_PE_TK_TIMEOUT_EN            BIT(22)
#define MTK_PE_INPUT_DMA_ERR            BIT(0)
#define MTK_PE_OUTPUT_DMA_ERR           BIT(1)
#define MTK_PE_PKT_PORC_ERR             BIT(2)
#define MTK_PE_PKT_TIMEOUT              BIT(3)
#define MTK_PE_FATAL_ERR                BIT(14)
#define MTK_PE_INPUT_DMA_ERR_EN         BIT(16)
#define MTK_PE_OUTPUT_DMA_ERR_EN        BIT(17)
#define MTK_PE_PKT_PORC_ERR_EN          BIT(18)
#define MTK_PE_PKT_TIMEOUT_EN           BIT(19)
#define MTK_PE_FATAL_ERR_EN             BIT(30)
#define MTK_PE_INT_OUT_EN               BIT(31)

#define MTK_HIA_SIGNATURE               ((u16)0x35ca)
#define MTK_HIA_DATA_WIDTH(x)           (((x) >> 25) & GENMASK(1, 0))
#define MTK_HIA_DMA_LENGTH(x)           (((x) >> 20) & GENMASK(4, 0))
#define MTK_CDR_STAT_CLR                GENMASK(4, 0)
#define MTK_RDR_STAT_CLR                GENMASK(7, 0)

#define MTK_AIC_INT_MSK                 GENMASK(5, 0)
#define MTK_AIC_VER_MSK                 (GENMASK(15, 0) | GENMASK(27, 20))
#define MTK_AIC_VER11                   0x011036c9
#define MTK_AIC_VER12                   0x012036c9
#define MTK_AIC_G_CLR                   GENMASK(30, 20)

/**
 * EIP97 is an integrated security subsystem to accelerate cryptographic
 * functions and protocols to offload the host processor.
 * Some important hardware modules are briefly introduced below:
 *
 * Host Interface Adapter(HIA) - the main interface between the host
 * system and the hardware subsystem. It is responsible for attaching
 * processing engine to the specific host bus interface and provides a
 * standardized software view for off loading tasks to the engine.
 *
 * Command Descriptor Ring Manager(CDR Manager) - keeps track of how many
 * CD the host has prepared in the CDR. It monitors the fill level of its
 * CD-FIFO and if there's sufficient space for the next block of descriptors,
 * then it fires off a DMA request to fetch a block of CDs.
 *
 * Data fetch engine(DFE) - It is responsible for parsing the CD and
 * setting up the required control and packet data DMA transfers from
 * system memory to the processing engine.
 *
 * Result Descriptor Ring Manager(RDR Manager) - same as CDR Manager,
 * but target is result descriptors, Moreover, it also handles the RD
 * updates under control of the DSE. For each packet data segment
 * processed, the DSE triggers the RDR Manager to write the updated RD.
 * If triggered to update, the RDR Manager sets up a DMA operation to
 * copy the RD from the DSE to the correct location in the RDR.
 *
 * Data Store Engine(DSE) - It is responsible for parsing the prepared RD
 * and setting up the required control and packet data DMA transfers from
 * the processing engine to system memory.
 *
 * Advanced Interrupt Controllers(AICs) - receive interrupt request signals
 * from various sources and combine them into one interrupt output.
 * The AICs are used by:
 * - One for the HIA global and processing engine interrupts.
 * - The others for the descriptor ring interrupts.
 */

/* Cryptographic engine capabilities */
struct mtk_sys_cap {
        /* host interface adapter */
        u32 hia_ver;
        u32 hia_opt;
        /* packet engine */
        u32 pkt_eng_opt;
        /* global hardware */
        u32 hw_opt;
};

static void mtk_desc_ring_link(struct mtk_cryp *cryp, u32 mask)
{
        /* Assign rings to DFE/DSE thread and enable it */
        writel(MTK_DFSE_THR_CTRL_EN | mask, cryp->base + DFE_THR_CTRL);
        writel(MTK_DFSE_THR_CTRL_EN | mask, cryp->base + DSE_THR_CTRL);
}

static void mtk_dfe_dse_buf_setup(struct mtk_cryp *cryp,
                                  struct mtk_sys_cap *cap)
{
        u32 width = MTK_HIA_DATA_WIDTH(cap->hia_opt) + 2;
        u32 len = MTK_HIA_DMA_LENGTH(cap->hia_opt) - 1;
        u32 ipbuf = min((u32)MTK_IN_DBUF_SIZE(cap->hw_opt) + width, len);
        u32 opbuf = min((u32)MTK_OUT_DBUF_SIZE(cap->hw_opt) + width, len);
        u32 itbuf = min((u32)MTK_IN_TBUF_SIZE(cap->hw_opt) + width, len);

        writel(MTK_DFSE_MIN_DATA(ipbuf - 1) |
               MTK_DFSE_MAX_DATA(ipbuf) |
               MTK_DFE_MIN_CTRL(itbuf - 1) |
               MTK_DFE_MAX_CTRL(itbuf),
               cryp->base + DFE_CFG);

        writel(MTK_DFSE_MIN_DATA(opbuf - 1) |
               MTK_DFSE_MAX_DATA(opbuf),
               cryp->base + DSE_CFG);

        writel(MTK_IN_BUF_MIN_THRESH(ipbuf - 1) |
               MTK_IN_BUF_MAX_THRESH(ipbuf),
               cryp->base + PE_IN_DBUF_THRESH);

        writel(MTK_IN_BUF_MIN_THRESH(itbuf - 1) |
               MTK_IN_BUF_MAX_THRESH(itbuf),
               cryp->base + PE_IN_TBUF_THRESH);

        writel(MTK_OUT_BUF_MIN_THRESH(opbuf - 1) |
               MTK_OUT_BUF_MAX_THRESH(opbuf),
               cryp->base + PE_OUT_DBUF_THRESH);

        writel(0, cryp->base + PE_OUT_TBUF_THRESH);
        writel(0, cryp->base + PE_OUT_BUF_CTRL);
}

static int mtk_dfe_dse_state_check(struct mtk_cryp *cryp)
{
        int ret = -EINVAL;
        u32 val;

        /* Check for completion of all DMA transfers */
        val = readl(cryp->base + DFE_THR_STAT);
        if (MTK_DFSE_RING_ID(val) == MTK_DFSE_IDLE) {
                val = readl(cryp->base + DSE_THR_STAT);
                if (MTK_DFSE_RING_ID(val) == MTK_DFSE_IDLE)
                        ret = 0;
        }

        if (!ret) {
                /* Take DFE/DSE thread out of reset */
                writel(0, cryp->base + DFE_THR_CTRL);
                writel(0, cryp->base + DSE_THR_CTRL);
        } else {
                return -EBUSY;
        }

        return 0;
}

static int mtk_dfe_dse_reset(struct mtk_cryp *cryp)
{
        int err;

        /* Reset DSE/DFE and correct system priorities for all rings. */
        writel(MTK_DFSE_THR_CTRL_RESET, cryp->base + DFE_THR_CTRL);
        writel(0, cryp->base + DFE_PRIO_0);
        writel(0, cryp->base + DFE_PRIO_1);
        writel(0, cryp->base + DFE_PRIO_2);
        writel(0, cryp->base + DFE_PRIO_3);

        writel(MTK_DFSE_THR_CTRL_RESET, cryp->base + DSE_THR_CTRL);
        writel(0, cryp->base + DSE_PRIO_0);
        writel(0, cryp->base + DSE_PRIO_1);
        writel(0, cryp->base + DSE_PRIO_2);
        writel(0, cryp->base + DSE_PRIO_3);

        err = mtk_dfe_dse_state_check(cryp);
        if (err)
                return err;

        return 0;
}

static void mtk_cmd_desc_ring_setup(struct mtk_cryp *cryp,
                                    int i, struct mtk_sys_cap *cap)
{
        /* Full descriptor that fits FIFO minus one */
        u32 count =
                ((1 << MTK_CMD_FIFO_SIZE(cap->hia_opt)) / MTK_DESC_SZ) - 1;

        /* Temporarily disable external triggering */
        writel(0, cryp->base + CDR_CFG(i));

        /* Clear CDR count */
        writel(MTK_CNT_RST, cryp->base + CDR_PREP_COUNT(i));
        writel(MTK_CNT_RST, cryp->base + CDR_PROC_COUNT(i));

        writel(0, cryp->base + CDR_PREP_PNTR(i));
        writel(0, cryp->base + CDR_PROC_PNTR(i));
        writel(0, cryp->base + CDR_DMA_CFG(i));

        /* Configure CDR host address space */
        writel(0, cryp->base + CDR_BASE_ADDR_HI(i));
        writel(cryp->ring[i]->cmd_dma, cryp->base + CDR_BASE_ADDR_LO(i));

        writel(MTK_DESC_RING_SZ, cryp->base + CDR_RING_SIZE(i));

        /* Clear and disable all CDR interrupts */
        writel(MTK_CDR_STAT_CLR, cryp->base + CDR_STAT(i));

        /*
         * Set command descriptor offset and enable additional
         * token present in descriptor.
         */
        writel(MTK_DESC_SIZE(MTK_DESC_SZ) |
                   MTK_DESC_OFFSET(MTK_DESC_OFF) |
               MTK_DESC_ATP_PRESENT,
               cryp->base + CDR_DESC_SIZE(i));

        writel(MTK_DESC_FETCH_SIZE(count * MTK_DESC_OFF) |
                   MTK_DESC_FETCH_THRESH(count * MTK_DESC_SZ),
                   cryp->base + CDR_CFG(i));
}

static void mtk_res_desc_ring_setup(struct mtk_cryp *cryp,
                                    int i, struct mtk_sys_cap *cap)
{
        u32 rndup = 2;
        u32 count = ((1 << MTK_RES_FIFO_SIZE(cap->hia_opt)) / rndup) - 1;

        /* Temporarily disable external triggering */
        writel(0, cryp->base + RDR_CFG(i));

        /* Clear RDR count */
        writel(MTK_CNT_RST, cryp->base + RDR_PREP_COUNT(i));
        writel(MTK_CNT_RST, cryp->base + RDR_PROC_COUNT(i));

        writel(0, cryp->base + RDR_PREP_PNTR(i));
        writel(0, cryp->base + RDR_PROC_PNTR(i));
        writel(0, cryp->base + RDR_DMA_CFG(i));

        /* Configure RDR host address space */
        writel(0, cryp->base + RDR_BASE_ADDR_HI(i));
        writel(cryp->ring[i]->res_dma, cryp->base + RDR_BASE_ADDR_LO(i));

        writel(MTK_DESC_RING_SZ, cryp->base + RDR_RING_SIZE(i));
        writel(MTK_RDR_STAT_CLR, cryp->base + RDR_STAT(i));

        /*
         * RDR manager generates update interrupts on a per-completed-packet,
         * and the rd_proc_thresh_irq interrupt is fired when proc_pkt_count
         * for the RDR exceeds the number of packets.
         */
        writel(MTK_RDR_PROC_THRESH | MTK_RDR_PROC_MODE,
               cryp->base + RDR_THRESH(i));

        /*
         * Configure a threshold and time-out value for the processed
         * result descriptors (or complete packets) that are written to
         * the RDR.
         */
        writel(MTK_DESC_SIZE(MTK_DESC_SZ) | MTK_DESC_OFFSET(MTK_DESC_OFF),
               cryp->base + RDR_DESC_SIZE(i));

        /*
         * Configure HIA fetch size and fetch threshold that are used to
         * fetch blocks of multiple descriptors.
         */
        writel(MTK_DESC_FETCH_SIZE(count * MTK_DESC_OFF) |
               MTK_DESC_FETCH_THRESH(count * rndup) |
               MTK_DESC_OVL_IRQ_EN,
                   cryp->base + RDR_CFG(i));
}

static int mtk_packet_engine_setup(struct mtk_cryp *cryp)
{
        struct mtk_sys_cap cap;
        int i, err;
        u32 val;

        cap.hia_ver = readl(cryp->base + HIA_VERSION);
        cap.hia_opt = readl(cryp->base + HIA_OPTIONS);
        cap.hw_opt = readl(cryp->base + EIP97_OPTIONS);

        if (!(((u16)cap.hia_ver) == MTK_HIA_SIGNATURE))
                return -EINVAL;

        /* Configure endianness conversion method for master (DMA) interface */
        writel(0, cryp->base + EIP97_MST_CTRL);

        /* Set HIA burst size */
        val = readl(cryp->base + HIA_MST_CTRL);
        val &= ~MTK_BURST_SIZE_MSK;
        val |= MTK_BURST_SIZE(5);
        writel(val, cryp->base + HIA_MST_CTRL);

        err = mtk_dfe_dse_reset(cryp);
        if (err) {
                dev_err(cryp->dev, "Failed to reset DFE and DSE.\n");
                return err;
        }

        mtk_dfe_dse_buf_setup(cryp, &cap);

        /* Enable the 4 rings for the packet engines. */
        mtk_desc_ring_link(cryp, 0xf);

        for (i = 0; i < MTK_RING_MAX; i++) {
                mtk_cmd_desc_ring_setup(cryp, i, &cap);
                mtk_res_desc_ring_setup(cryp, i, &cap);
        }

        writel(MTK_PE_TK_LOC_AVL | MTK_PE_PROC_HELD | MTK_PE_TK_TIMEOUT_EN,
               cryp->base + PE_TOKEN_CTRL_STAT);

        /* Clear all pending interrupts */
        writel(MTK_AIC_G_CLR, cryp->base + AIC_G_ACK);
        writel(MTK_PE_INPUT_DMA_ERR | MTK_PE_OUTPUT_DMA_ERR |
               MTK_PE_PKT_PORC_ERR | MTK_PE_PKT_TIMEOUT |
               MTK_PE_FATAL_ERR | MTK_PE_INPUT_DMA_ERR_EN |
               MTK_PE_OUTPUT_DMA_ERR_EN | MTK_PE_PKT_PORC_ERR_EN |
               MTK_PE_PKT_TIMEOUT_EN | MTK_PE_FATAL_ERR_EN |
               MTK_PE_INT_OUT_EN,
               cryp->base + PE_INTERRUPT_CTRL_STAT);

        return 0;
}

static int mtk_aic_cap_check(struct mtk_cryp *cryp, int hw)
{
        u32 val;

        if (hw == MTK_RING_MAX)
                val = readl(cryp->base + AIC_G_VERSION);
        else
                val = readl(cryp->base + AIC_VERSION(hw));

        val &= MTK_AIC_VER_MSK;
        if (val != MTK_AIC_VER11 && val != MTK_AIC_VER12)
                return -ENXIO;

        if (hw == MTK_RING_MAX)
                val = readl(cryp->base + AIC_G_OPTIONS);
        else
                val = readl(cryp->base + AIC_OPTIONS(hw));

        val &= MTK_AIC_INT_MSK;
        if (!val || val > 32)
                return -ENXIO;

        return 0;
}

static int mtk_aic_init(struct mtk_cryp *cryp, int hw)
{
        int err;

        err = mtk_aic_cap_check(cryp, hw);
        if (err)
                return err;

        /* Disable all interrupts and set initial configuration */
        if (hw == MTK_RING_MAX) {
                writel(0, cryp->base + AIC_G_ENABLE_CTRL);
                writel(0, cryp->base + AIC_G_POL_CTRL);
                writel(0, cryp->base + AIC_G_TYPE_CTRL);
                writel(0, cryp->base + AIC_G_ENABLE_SET);
        } else {
                writel(0, cryp->base + AIC_ENABLE_CTRL(hw));
                writel(0, cryp->base + AIC_POL_CTRL(hw));
                writel(0, cryp->base + AIC_TYPE_CTRL(hw));
                writel(0, cryp->base + AIC_ENABLE_SET(hw));
        }

        return 0;
}

static int mtk_accelerator_init(struct mtk_cryp *cryp)
{
        int i, err;

        /* Initialize advanced interrupt controller(AIC) */
        for (i = 0; i < MTK_IRQ_NUM; i++) {
                err = mtk_aic_init(cryp, i);
                if (err) {
                        dev_err(cryp->dev, "Failed to initialize AIC.\n");
                        return err;
                }
        }

        /* Initialize packet engine */
        err = mtk_packet_engine_setup(cryp);
        if (err) {
                dev_err(cryp->dev, "Failed to configure packet engine.\n");
                return err;
        }

        return 0;
}

static void mtk_desc_dma_free(struct mtk_cryp *cryp)
{
        int i;

        for (i = 0; i < MTK_RING_MAX; i++) {
                dma_free_coherent(cryp->dev, MTK_DESC_RING_SZ,
                                  cryp->ring[i]->res_base,
                                  cryp->ring[i]->res_dma);
                dma_free_coherent(cryp->dev, MTK_DESC_RING_SZ,
                                  cryp->ring[i]->cmd_base,
                                  cryp->ring[i]->cmd_dma);
                kfree(cryp->ring[i]);
        }
}

static int mtk_desc_ring_alloc(struct mtk_cryp *cryp)
{
        struct mtk_ring **ring = cryp->ring;
        int i, err = ENOMEM;

        for (i = 0; i < MTK_RING_MAX; i++) {
                ring[i] = kzalloc(sizeof(**ring), GFP_KERNEL);
                if (!ring[i])
                        goto err_cleanup;

                ring[i]->cmd_base = dma_alloc_coherent(cryp->dev,
                                                       MTK_DESC_RING_SZ,
                                                       &ring[i]->cmd_dma,
                                                       GFP_KERNEL);
                if (!ring[i]->cmd_base)
                        goto err_cleanup;

                ring[i]->res_base = dma_alloc_coherent(cryp->dev,
                                                       MTK_DESC_RING_SZ,
                                                       &ring[i]->res_dma,
                                                       GFP_KERNEL);
                if (!ring[i]->res_base)
                        goto err_cleanup;

                ring[i]->cmd_next = ring[i]->cmd_base;
                ring[i]->res_next = ring[i]->res_base;
        }
        return 0;

err_cleanup:
        for (; i--; ) {
                dma_free_coherent(cryp->dev, MTK_DESC_RING_SZ,
                                  ring[i]->res_base, ring[i]->res_dma);
                dma_free_coherent(cryp->dev, MTK_DESC_RING_SZ,
                                  ring[i]->cmd_base, ring[i]->cmd_dma);
                kfree(ring[i]);
        }
        return err;
}

static int mtk_crypto_probe(struct platform_device *pdev)
{
        struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
        struct mtk_cryp *cryp;
        int i, err;

        cryp = devm_kzalloc(&pdev->dev, sizeof(*cryp), GFP_KERNEL);
        if (!cryp)
                return -ENOMEM;

        cryp->base = devm_ioremap_resource(&pdev->dev, res);
        if (IS_ERR(cryp->base))
                return PTR_ERR(cryp->base);

        for (i = 0; i < MTK_IRQ_NUM; i++) {
                cryp->irq[i] = platform_get_irq(pdev, i);
                if (cryp->irq[i] < 0) {
                        dev_err(cryp->dev, "no IRQ:%d resource info\n", i);
                        return cryp->irq[i];
                }
        }

        cryp->clk_cryp = devm_clk_get(&pdev->dev, "cryp");
        if (IS_ERR(cryp->clk_cryp))
                return -EPROBE_DEFER;

        cryp->dev = &pdev->dev;
        pm_runtime_enable(cryp->dev);
        pm_runtime_get_sync(cryp->dev);

        err = clk_prepare_enable(cryp->clk_cryp);
        if (err)
                goto err_clk_cryp;

        /* Allocate four command/result descriptor rings */
        err = mtk_desc_ring_alloc(cryp);
        if (err) {
                dev_err(cryp->dev, "Unable to allocate descriptor rings.\n");
                goto err_resource;
        }

        /* Initialize hardware modules */
        err = mtk_accelerator_init(cryp);
        if (err) {
                dev_err(cryp->dev, "Failed to initialize cryptographic engine.\n");
                goto err_engine;
        }

        err = mtk_cipher_alg_register(cryp);
        if (err) {
                dev_err(cryp->dev, "Unable to register cipher algorithm.\n");
                goto err_cipher;
        }

        err = mtk_hash_alg_register(cryp);
        if (err) {
                dev_err(cryp->dev, "Unable to register hash algorithm.\n");
                goto err_hash;
        }

        platform_set_drvdata(pdev, cryp);
        return 0;

err_hash:
        mtk_cipher_alg_release(cryp);
err_cipher:
        mtk_dfe_dse_reset(cryp);
err_engine:
        mtk_desc_dma_free(cryp);
err_resource:
        clk_disable_unprepare(cryp->clk_cryp);
err_clk_cryp:
        pm_runtime_put_sync(cryp->dev);
        pm_runtime_disable(cryp->dev);

        return err;
}

static int mtk_crypto_remove(struct platform_device *pdev)
{
        struct mtk_cryp *cryp = platform_get_drvdata(pdev);

        mtk_hash_alg_release(cryp);
        mtk_cipher_alg_release(cryp);
        mtk_desc_dma_free(cryp);

        clk_disable_unprepare(cryp->clk_cryp);

        pm_runtime_put_sync(cryp->dev);
        pm_runtime_disable(cryp->dev);
        platform_set_drvdata(pdev, NULL);

        return 0;
}

static const struct of_device_id of_crypto_id[] = {
        { .compatible = "mediatek,eip97-crypto" },
        {},
};
MODULE_DEVICE_TABLE(of, of_crypto_id);

static struct platform_driver mtk_crypto_driver = {
        .probe = mtk_crypto_probe,
        .remove = mtk_crypto_remove,
        .driver = {
                   .name = "mtk-crypto",
                   .of_match_table = of_crypto_id,
        },
};
module_platform_driver(mtk_crypto_driver);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Ryder Lee <ryder.lee@mediatek.com>");
MODULE_DESCRIPTION("Cryptographic accelerator driver for EIP97");