drivers/soc/ti/k3-ringacc.c

root/drivers/soc/ti/k3-ringacc.c
// SPDX-License-Identifier: GPL-2.0
/*
 * TI K3 NAVSS Ring Accelerator subsystem driver
 *
 * Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com
 */

#include <linux/dma-mapping.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/sys_soc.h>
#include <linux/dma/ti-cppi5.h>
#include <linux/soc/ti/k3-ringacc.h>
#include <linux/soc/ti/ti_sci_protocol.h>
#include <linux/soc/ti/ti_sci_inta_msi.h>
#include <linux/of_irq.h>
#include <linux/irqdomain.h>

static LIST_HEAD(k3_ringacc_list);
static DEFINE_MUTEX(k3_ringacc_list_lock);

#define K3_RINGACC_CFG_RING_SIZE_ELCNT_MASK             GENMASK(19, 0)
#define K3_DMARING_CFG_RING_SIZE_ELCNT_MASK             GENMASK(15, 0)

/**
 * struct k3_ring_rt_regs - The RA realtime Control/Status Registers region
 *
 * @resv_16: Reserved
 * @db: Ring Doorbell Register
 * @resv_4: Reserved
 * @occ: Ring Occupancy Register
 * @indx: Ring Current Index Register
 * @hwocc: Ring Hardware Occupancy Register
 * @hwindx: Ring Hardware Current Index Register
 */
struct k3_ring_rt_regs {
        u32     resv_16[4];
        u32     db;
        u32     resv_4[1];
        u32     occ;
        u32     indx;
        u32     hwocc;
        u32     hwindx;
};

#define K3_RINGACC_RT_REGS_STEP                 0x1000
#define K3_DMARING_RT_REGS_STEP                 0x2000
#define K3_DMARING_RT_REGS_REVERSE_OFS          0x1000
#define K3_RINGACC_RT_OCC_MASK                  GENMASK(20, 0)
#define K3_DMARING_RT_OCC_TDOWN_COMPLETE        BIT(31)
#define K3_DMARING_RT_DB_ENTRY_MASK             GENMASK(7, 0)
#define K3_DMARING_RT_DB_TDOWN_ACK              BIT(31)

/**
 * struct k3_ring_fifo_regs - The Ring Accelerator Queues Registers region
 *
 * @head_data: Ring Head Entry Data Registers
 * @tail_data: Ring Tail Entry Data Registers
 * @peek_head_data: Ring Peek Head Entry Data Regs
 * @peek_tail_data: Ring Peek Tail Entry Data Regs
 */
struct k3_ring_fifo_regs {
        u32     head_data[128];
        u32     tail_data[128];
        u32     peek_head_data[128];
        u32     peek_tail_data[128];
};

/**
 * struct k3_ringacc_proxy_gcfg_regs - RA Proxy Global Config MMIO Region
 *
 * @revision: Revision Register
 * @config: Config Register
 */
struct k3_ringacc_proxy_gcfg_regs {
        u32     revision;
        u32     config;
};

#define K3_RINGACC_PROXY_CFG_THREADS_MASK               GENMASK(15, 0)

/**
 * struct k3_ringacc_proxy_target_regs - Proxy Datapath MMIO Region
 *
 * @control: Proxy Control Register
 * @status: Proxy Status Register
 * @resv_512: Reserved
 * @data: Proxy Data Register
 */
struct k3_ringacc_proxy_target_regs {
        u32     control;
        u32     status;
        u8      resv_512[504];
        u32     data[128];
};

#define K3_RINGACC_PROXY_TARGET_STEP    0x1000
#define K3_RINGACC_PROXY_NOT_USED       (-1)

enum k3_ringacc_proxy_access_mode {
        PROXY_ACCESS_MODE_HEAD = 0,
        PROXY_ACCESS_MODE_TAIL = 1,
        PROXY_ACCESS_MODE_PEEK_HEAD = 2,
        PROXY_ACCESS_MODE_PEEK_TAIL = 3,
};

#define K3_RINGACC_FIFO_WINDOW_SIZE_BYTES  (512U)
#define K3_RINGACC_FIFO_REGS_STEP       0x1000
#define K3_RINGACC_MAX_DB_RING_CNT    (127U)

struct k3_ring_ops {
        int (*push_tail)(struct k3_ring *ring, void *elm);
        int (*push_head)(struct k3_ring *ring, void *elm);
        int (*pop_tail)(struct k3_ring *ring, void *elm);
        int (*pop_head)(struct k3_ring *ring, void *elm);
};

/**
 * struct k3_ring_state - Internal state tracking structure
 *
 * @free: Number of free entries
 * @occ: Occupancy
 * @windex: Write index
 * @rindex: Read index
 * @tdown_complete: Tear down complete state
 */
struct k3_ring_state {
        u32 free;
        u32 occ;
        u32 windex;
        u32 rindex;
        u32 tdown_complete:1;
};

/**
 * struct k3_ring - RA Ring descriptor
 *
 * @rt: Ring control/status registers
 * @fifos: Ring queues registers
 * @proxy: Ring Proxy Datapath registers
 * @ring_mem_dma: Ring buffer dma address
 * @ring_mem_virt: Ring buffer virt address
 * @ops: Ring operations
 * @size: Ring size in elements
 * @elm_size: Size of the ring element
 * @mode: Ring mode
 * @flags: flags
 * @state: Ring state
 * @ring_id: Ring Id
 * @parent: Pointer on struct @k3_ringacc
 * @use_count: Use count for shared rings
 * @proxy_id: RA Ring Proxy Id (only if @K3_RINGACC_RING_USE_PROXY)
 * @dma_dev: device to be used for DMA API (allocation, mapping)
 * @asel: Address Space Select value for physical addresses
 */
struct k3_ring {
        struct k3_ring_rt_regs __iomem *rt;
        struct k3_ring_fifo_regs __iomem *fifos;
        struct k3_ringacc_proxy_target_regs  __iomem *proxy;
        dma_addr_t      ring_mem_dma;
        void            *ring_mem_virt;
        const struct k3_ring_ops *ops;
        u32             size;
        enum k3_ring_size elm_size;
        enum k3_ring_mode mode;
        u32             flags;
#define K3_RING_FLAG_BUSY       BIT(1)
#define K3_RING_FLAG_SHARED     BIT(2)
#define K3_RING_FLAG_REVERSE    BIT(3)
        struct k3_ring_state state;
        u32             ring_id;
        struct k3_ringacc       *parent;
        u32             use_count;
        int             proxy_id;
        struct device   *dma_dev;
        u32             asel;
#define K3_ADDRESS_ASEL_SHIFT   48
};

struct k3_ringacc_ops {
        int (*init)(struct platform_device *pdev, struct k3_ringacc *ringacc);
};

/**
 * struct k3_ringacc - Rings accelerator descriptor
 *
 * @dev: pointer on RA device
 * @proxy_gcfg: RA proxy global config registers
 * @proxy_target_base: RA proxy datapath region
 * @num_rings: number of ring in RA
 * @rings_inuse: bitfield for ring usage tracking
 * @rm_gp_range: general purpose rings range from tisci
 * @dma_ring_reset_quirk: DMA reset workaround enable
 * @num_proxies: number of RA proxies
 * @proxy_inuse: bitfield for proxy usage tracking
 * @rings: array of rings descriptors (struct @k3_ring)
 * @list: list of RAs in the system
 * @req_lock: protect rings allocation
 * @tisci: pointer ti-sci handle
 * @tisci_ring_ops: ti-sci rings ops
 * @tisci_dev_id: ti-sci device id
 * @ops: SoC specific ringacc operation
 * @dma_rings: indicate DMA ring (dual ring within BCDMA/PKTDMA)
 */
struct k3_ringacc {
        struct device *dev;
        struct k3_ringacc_proxy_gcfg_regs __iomem *proxy_gcfg;
        void __iomem *proxy_target_base;
        u32 num_rings; /* number of rings in Ringacc module */
        unsigned long *rings_inuse;
        struct ti_sci_resource *rm_gp_range;

        bool dma_ring_reset_quirk;
        u32 num_proxies;
        unsigned long *proxy_inuse;

        struct k3_ring *rings;
        struct list_head list;
        struct mutex req_lock; /* protect rings allocation */

        const struct ti_sci_handle *tisci;
        const struct ti_sci_rm_ringacc_ops *tisci_ring_ops;
        u32 tisci_dev_id;

        const struct k3_ringacc_ops *ops;
        bool dma_rings;
};

/**
 * struct k3_ringacc_soc_data - Rings accelerator SoC data
 *
 * @dma_ring_reset_quirk:  DMA reset workaround enable
 */
struct k3_ringacc_soc_data {
        unsigned dma_ring_reset_quirk:1;
};

static int k3_ringacc_ring_read_occ(struct k3_ring *ring)
{
        return readl(&ring->rt->occ) & K3_RINGACC_RT_OCC_MASK;
}

static void k3_ringacc_ring_update_occ(struct k3_ring *ring)
{
        u32 val;

        val = readl(&ring->rt->occ);

        ring->state.occ = val & K3_RINGACC_RT_OCC_MASK;
        ring->state.tdown_complete = !!(val & K3_DMARING_RT_OCC_TDOWN_COMPLETE);
}

static long k3_ringacc_ring_get_fifo_pos(struct k3_ring *ring)
{
        return K3_RINGACC_FIFO_WINDOW_SIZE_BYTES -
               (4 << ring->elm_size);
}

static void *k3_ringacc_get_elm_addr(struct k3_ring *ring, u32 idx)
{
        return (ring->ring_mem_virt + idx * (4 << ring->elm_size));
}

static int k3_ringacc_ring_push_mem(struct k3_ring *ring, void *elem);
static int k3_ringacc_ring_pop_mem(struct k3_ring *ring, void *elem);
static int k3_dmaring_fwd_pop(struct k3_ring *ring, void *elem);
static int k3_dmaring_reverse_pop(struct k3_ring *ring, void *elem);

static const struct k3_ring_ops k3_ring_mode_ring_ops = {
                .push_tail = k3_ringacc_ring_push_mem,
                .pop_head = k3_ringacc_ring_pop_mem,
};

static const struct k3_ring_ops k3_dmaring_fwd_ops = {
                .push_tail = k3_ringacc_ring_push_mem,
                .pop_head = k3_dmaring_fwd_pop,
};

static const struct k3_ring_ops k3_dmaring_reverse_ops = {
                /* Reverse side of the DMA ring can only be popped by SW */
                .pop_head = k3_dmaring_reverse_pop,
};

static int k3_ringacc_ring_push_io(struct k3_ring *ring, void *elem);
static int k3_ringacc_ring_pop_io(struct k3_ring *ring, void *elem);
static int k3_ringacc_ring_push_head_io(struct k3_ring *ring, void *elem);
static int k3_ringacc_ring_pop_tail_io(struct k3_ring *ring, void *elem);

static const struct k3_ring_ops k3_ring_mode_msg_ops = {
                .push_tail = k3_ringacc_ring_push_io,
                .push_head = k3_ringacc_ring_push_head_io,
                .pop_tail = k3_ringacc_ring_pop_tail_io,
                .pop_head = k3_ringacc_ring_pop_io,
};

static int k3_ringacc_ring_push_head_proxy(struct k3_ring *ring, void *elem);
static int k3_ringacc_ring_push_tail_proxy(struct k3_ring *ring, void *elem);
static int k3_ringacc_ring_pop_head_proxy(struct k3_ring *ring, void *elem);
static int k3_ringacc_ring_pop_tail_proxy(struct k3_ring *ring, void *elem);

static const struct k3_ring_ops k3_ring_mode_proxy_ops = {
                .push_tail = k3_ringacc_ring_push_tail_proxy,
                .push_head = k3_ringacc_ring_push_head_proxy,
                .pop_tail = k3_ringacc_ring_pop_tail_proxy,
                .pop_head = k3_ringacc_ring_pop_head_proxy,
};

static void k3_ringacc_ring_dump(struct k3_ring *ring)
{
        struct device *dev = ring->parent->dev;

        dev_dbg(dev, "dump ring: %d\n", ring->ring_id);
        dev_dbg(dev, "dump mem virt %p, dma %pad\n", ring->ring_mem_virt,
                &ring->ring_mem_dma);
        dev_dbg(dev, "dump elmsize %d, size %d, mode %d, proxy_id %d\n",
                ring->elm_size, ring->size, ring->mode, ring->proxy_id);
        dev_dbg(dev, "dump flags %08X\n", ring->flags);

        dev_dbg(dev, "dump ring_rt_regs: db%08x\n", readl(&ring->rt->db));
        dev_dbg(dev, "dump occ%08x\n", readl(&ring->rt->occ));
        dev_dbg(dev, "dump indx%08x\n", readl(&ring->rt->indx));
        dev_dbg(dev, "dump hwocc%08x\n", readl(&ring->rt->hwocc));
        dev_dbg(dev, "dump hwindx%08x\n", readl(&ring->rt->hwindx));

        if (ring->ring_mem_virt)
                print_hex_dump_debug("dump ring_mem_virt ", DUMP_PREFIX_NONE,
                                     16, 1, ring->ring_mem_virt, 16 * 8, false);
}

struct k3_ring *k3_ringacc_request_ring(struct k3_ringacc *ringacc,
                                        int id, u32 flags)
{
        int proxy_id = K3_RINGACC_PROXY_NOT_USED;

        mutex_lock(&ringacc->req_lock);

        if (!try_module_get(ringacc->dev->driver->owner))
                goto err_module_get;

        if (id == K3_RINGACC_RING_ID_ANY) {
                /* Request for any general purpose ring */
                struct ti_sci_resource_desc *gp_rings =
                                                &ringacc->rm_gp_range->desc[0];
                unsigned long size;

                size = gp_rings->start + gp_rings->num;
                id = find_next_zero_bit(ringacc->rings_inuse, size,
                                        gp_rings->start);
                if (id == size)
                        goto error;
        } else if (id < 0) {
                goto error;
        }

        if (test_bit(id, ringacc->rings_inuse) &&
            !(ringacc->rings[id].flags & K3_RING_FLAG_SHARED))
                goto error;
        else if (ringacc->rings[id].flags & K3_RING_FLAG_SHARED)
                goto out;

        if (flags & K3_RINGACC_RING_USE_PROXY) {
                proxy_id = find_first_zero_bit(ringacc->proxy_inuse,
                                              ringacc->num_proxies);
                if (proxy_id == ringacc->num_proxies)
                        goto error;
        }

        if (proxy_id != K3_RINGACC_PROXY_NOT_USED) {
                set_bit(proxy_id, ringacc->proxy_inuse);
                ringacc->rings[id].proxy_id = proxy_id;
                dev_dbg(ringacc->dev, "Giving ring#%d proxy#%d\n", id,
                        proxy_id);
        } else {
                dev_dbg(ringacc->dev, "Giving ring#%d\n", id);
        }

        set_bit(id, ringacc->rings_inuse);
out:
        ringacc->rings[id].use_count++;
        mutex_unlock(&ringacc->req_lock);
        return &ringacc->rings[id];

error:
        module_put(ringacc->dev->driver->owner);

err_module_get:
        mutex_unlock(&ringacc->req_lock);
        return NULL;
}
EXPORT_SYMBOL_GPL(k3_ringacc_request_ring);

static int k3_dmaring_request_dual_ring(struct k3_ringacc *ringacc, int fwd_id,
                                        struct k3_ring **fwd_ring,
                                        struct k3_ring **compl_ring)
{
        int ret = 0;

        /*
         * DMA rings must be requested by ID, completion ring is the reverse
         * side of the forward ring
         */
        if (fwd_id < 0)
                return -EINVAL;

        mutex_lock(&ringacc->req_lock);

        if (!try_module_get(ringacc->dev->driver->owner)) {
                ret = -EINVAL;
                goto err_module_get;
        }

        if (test_bit(fwd_id, ringacc->rings_inuse)) {
                ret = -EBUSY;
                goto error;
        }

        *fwd_ring = &ringacc->rings[fwd_id];
        *compl_ring = &ringacc->rings[fwd_id + ringacc->num_rings];
        set_bit(fwd_id, ringacc->rings_inuse);
        ringacc->rings[fwd_id].use_count++;
        dev_dbg(ringacc->dev, "Giving ring#%d\n", fwd_id);

        mutex_unlock(&ringacc->req_lock);
        return 0;

error:
        module_put(ringacc->dev->driver->owner);
err_module_get:
        mutex_unlock(&ringacc->req_lock);
        return ret;
}

int k3_ringacc_request_rings_pair(struct k3_ringacc *ringacc,
                                  int fwd_id, int compl_id,
                                  struct k3_ring **fwd_ring,
                                  struct k3_ring **compl_ring)
{
        int ret = 0;

        if (!fwd_ring || !compl_ring)
                return -EINVAL;

        if (ringacc->dma_rings)
                return k3_dmaring_request_dual_ring(ringacc, fwd_id,
                                                    fwd_ring, compl_ring);

        *fwd_ring = k3_ringacc_request_ring(ringacc, fwd_id, 0);
        if (!(*fwd_ring))
                return -ENODEV;

        *compl_ring = k3_ringacc_request_ring(ringacc, compl_id, 0);
        if (!(*compl_ring)) {
                k3_ringacc_ring_free(*fwd_ring);
                ret = -ENODEV;
        }

        return ret;
}
EXPORT_SYMBOL_GPL(k3_ringacc_request_rings_pair);

static void k3_ringacc_ring_reset_sci(struct k3_ring *ring)
{
        struct ti_sci_msg_rm_ring_cfg ring_cfg = { 0 };
        struct k3_ringacc *ringacc = ring->parent;
        int ret;

        ring_cfg.nav_id = ringacc->tisci_dev_id;
        ring_cfg.index = ring->ring_id;
        ring_cfg.valid_params = TI_SCI_MSG_VALUE_RM_RING_COUNT_VALID;
        ring_cfg.count = ring->size;

        ret = ringacc->tisci_ring_ops->set_cfg(ringacc->tisci, &ring_cfg);
        if (ret)
                dev_err(ringacc->dev, "TISCI reset ring fail (%d) ring_idx %d\n",
                        ret, ring->ring_id);
}

void k3_ringacc_ring_reset(struct k3_ring *ring)
{
        if (!ring || !(ring->flags & K3_RING_FLAG_BUSY))
                return;

        memset(&ring->state, 0, sizeof(ring->state));

        k3_ringacc_ring_reset_sci(ring);
}
EXPORT_SYMBOL_GPL(k3_ringacc_ring_reset);

static void k3_ringacc_ring_reconfig_qmode_sci(struct k3_ring *ring,
                                               enum k3_ring_mode mode)
{
        struct ti_sci_msg_rm_ring_cfg ring_cfg = { 0 };
        struct k3_ringacc *ringacc = ring->parent;
        int ret;

        ring_cfg.nav_id = ringacc->tisci_dev_id;
        ring_cfg.index = ring->ring_id;
        ring_cfg.valid_params = TI_SCI_MSG_VALUE_RM_RING_MODE_VALID;
        ring_cfg.mode = mode;

        ret = ringacc->tisci_ring_ops->set_cfg(ringacc->tisci, &ring_cfg);
        if (ret)
                dev_err(ringacc->dev, "TISCI reconf qmode fail (%d) ring_idx %d\n",
                        ret, ring->ring_id);
}

void k3_ringacc_ring_reset_dma(struct k3_ring *ring, u32 occ)
{
        if (!ring || !(ring->flags & K3_RING_FLAG_BUSY))
                return;

        if (!ring->parent->dma_ring_reset_quirk)
                goto reset;

        if (!occ)
                occ = k3_ringacc_ring_read_occ(ring);

        if (occ) {
                u32 db_ring_cnt, db_ring_cnt_cur;

                dev_dbg(ring->parent->dev, "%s %u occ: %u\n", __func__,
                        ring->ring_id, occ);
                /* TI-SCI ring reset */
                k3_ringacc_ring_reset_sci(ring);

                /*
                 * Setup the ring in ring/doorbell mode (if not already in this
                 * mode)
                 */
                if (ring->mode != K3_RINGACC_RING_MODE_RING)
                        k3_ringacc_ring_reconfig_qmode_sci(
                                        ring, K3_RINGACC_RING_MODE_RING);
                /*
                 * Ring the doorbell 2**22 – ringOcc times.
                 * This will wrap the internal UDMAP ring state occupancy
                 * counter (which is 21-bits wide) to 0.
                 */
                db_ring_cnt = (1U << 22) - occ;

                while (db_ring_cnt != 0) {
                        /*
                         * Ring the doorbell with the maximum count each
                         * iteration if possible to minimize the total
                         * of writes
                         */
                        if (db_ring_cnt > K3_RINGACC_MAX_DB_RING_CNT)
                                db_ring_cnt_cur = K3_RINGACC_MAX_DB_RING_CNT;
                        else
                                db_ring_cnt_cur = db_ring_cnt;

                        writel(db_ring_cnt_cur, &ring->rt->db);
                        db_ring_cnt -= db_ring_cnt_cur;
                }

                /* Restore the original ring mode (if not ring mode) */
                if (ring->mode != K3_RINGACC_RING_MODE_RING)
                        k3_ringacc_ring_reconfig_qmode_sci(ring, ring->mode);
        }

reset:
        /* Reset the ring */
        k3_ringacc_ring_reset(ring);
}
EXPORT_SYMBOL_GPL(k3_ringacc_ring_reset_dma);

static void k3_ringacc_ring_free_sci(struct k3_ring *ring)
{
        struct ti_sci_msg_rm_ring_cfg ring_cfg = { 0 };
        struct k3_ringacc *ringacc = ring->parent;
        int ret;

        ring_cfg.nav_id = ringacc->tisci_dev_id;
        ring_cfg.index = ring->ring_id;
        ring_cfg.valid_params = TI_SCI_MSG_VALUE_RM_ALL_NO_ORDER;

        ret = ringacc->tisci_ring_ops->set_cfg(ringacc->tisci, &ring_cfg);
        if (ret)
                dev_err(ringacc->dev, "TISCI ring free fail (%d) ring_idx %d\n",
                        ret, ring->ring_id);
}

int k3_ringacc_ring_free(struct k3_ring *ring)
{
        struct k3_ringacc *ringacc;

        if (!ring)
                return -EINVAL;

        ringacc = ring->parent;

        /*
         * DMA rings: rings shared memory and configuration, only forward ring
         * is configured and reverse ring considered as slave.
         */
        if (ringacc->dma_rings && (ring->flags & K3_RING_FLAG_REVERSE))
                return 0;

        dev_dbg(ring->parent->dev, "flags: 0x%08x\n", ring->flags);

        if (!test_bit(ring->ring_id, ringacc->rings_inuse))
                return -EINVAL;

        mutex_lock(&ringacc->req_lock);

        if (--ring->use_count)
                goto out;

        if (!(ring->flags & K3_RING_FLAG_BUSY))
                goto no_init;

        k3_ringacc_ring_free_sci(ring);

        dma_free_coherent(ring->dma_dev,
                          ring->size * (4 << ring->elm_size),
                          ring->ring_mem_virt, ring->ring_mem_dma);
        ring->flags = 0;
        ring->ops = NULL;
        ring->dma_dev = NULL;
        ring->asel = 0;

        if (ring->proxy_id != K3_RINGACC_PROXY_NOT_USED) {
                clear_bit(ring->proxy_id, ringacc->proxy_inuse);
                ring->proxy = NULL;
                ring->proxy_id = K3_RINGACC_PROXY_NOT_USED;
        }

no_init:
        clear_bit(ring->ring_id, ringacc->rings_inuse);

        module_put(ringacc->dev->driver->owner);

out:
        mutex_unlock(&ringacc->req_lock);
        return 0;
}
EXPORT_SYMBOL_GPL(k3_ringacc_ring_free);

u32 k3_ringacc_get_ring_id(struct k3_ring *ring)
{
        if (!ring)
                return -EINVAL;

        return ring->ring_id;
}
EXPORT_SYMBOL_GPL(k3_ringacc_get_ring_id);

u32 k3_ringacc_get_tisci_dev_id(struct k3_ring *ring)
{
        if (!ring)
                return -EINVAL;

        return ring->parent->tisci_dev_id;
}
EXPORT_SYMBOL_GPL(k3_ringacc_get_tisci_dev_id);

int k3_ringacc_get_ring_irq_num(struct k3_ring *ring)
{
        int irq_num;

        if (!ring)
                return -EINVAL;

        irq_num = msi_get_virq(ring->parent->dev, ring->ring_id);
        if (irq_num <= 0)
                irq_num = -EINVAL;
        return irq_num;
}
EXPORT_SYMBOL_GPL(k3_ringacc_get_ring_irq_num);

static int k3_ringacc_ring_cfg_sci(struct k3_ring *ring)
{
        struct ti_sci_msg_rm_ring_cfg ring_cfg = { 0 };
        struct k3_ringacc *ringacc = ring->parent;
        int ret;

        if (!ringacc->tisci)
                return -EINVAL;

        ring_cfg.nav_id = ringacc->tisci_dev_id;
        ring_cfg.index = ring->ring_id;
        ring_cfg.valid_params = TI_SCI_MSG_VALUE_RM_ALL_NO_ORDER;
        ring_cfg.addr_lo = lower_32_bits(ring->ring_mem_dma);
        ring_cfg.addr_hi = upper_32_bits(ring->ring_mem_dma);
        ring_cfg.count = ring->size;
        ring_cfg.mode = ring->mode;
        ring_cfg.size = ring->elm_size;
        ring_cfg.asel = ring->asel;

        ret = ringacc->tisci_ring_ops->set_cfg(ringacc->tisci, &ring_cfg);
        if (ret)
                dev_err(ringacc->dev, "TISCI config ring fail (%d) ring_idx %d\n",
                        ret, ring->ring_id);

        return ret;
}

static int k3_dmaring_cfg(struct k3_ring *ring, struct k3_ring_cfg *cfg)
{
        struct k3_ringacc *ringacc;
        struct k3_ring *reverse_ring;
        int ret = 0;

        if (cfg->elm_size != K3_RINGACC_RING_ELSIZE_8 ||
            cfg->mode != K3_RINGACC_RING_MODE_RING ||
            cfg->size & ~K3_DMARING_CFG_RING_SIZE_ELCNT_MASK)
                return -EINVAL;

        ringacc = ring->parent;

        /*
         * DMA rings: rings shared memory and configuration, only forward ring
         * is configured and reverse ring considered as slave.
         */
        if (ringacc->dma_rings && (ring->flags & K3_RING_FLAG_REVERSE))
                return 0;

        if (!test_bit(ring->ring_id, ringacc->rings_inuse))
                return -EINVAL;

        ring->size = cfg->size;
        ring->elm_size = cfg->elm_size;
        ring->mode = cfg->mode;
        ring->asel = cfg->asel;
        ring->dma_dev = cfg->dma_dev;
        if (!ring->dma_dev) {
                dev_warn(ringacc->dev, "dma_dev is not provided for ring%d\n",
                         ring->ring_id);
                ring->dma_dev = ringacc->dev;
        }

        memset(&ring->state, 0, sizeof(ring->state));

        ring->ops = &k3_dmaring_fwd_ops;

        ring->ring_mem_virt = dma_alloc_coherent(ring->dma_dev,
                                                 ring->size * (4 << ring->elm_size),
                                                 &ring->ring_mem_dma, GFP_KERNEL);
        if (!ring->ring_mem_virt) {
                dev_err(ringacc->dev, "Failed to alloc ring mem\n");
                ret = -ENOMEM;
                goto err_free_ops;
        }

        ret = k3_ringacc_ring_cfg_sci(ring);
        if (ret)
                goto err_free_mem;

        ring->flags |= K3_RING_FLAG_BUSY;

        k3_ringacc_ring_dump(ring);

        /* DMA rings: configure reverse ring */
        reverse_ring = &ringacc->rings[ring->ring_id + ringacc->num_rings];
        reverse_ring->size = cfg->size;
        reverse_ring->elm_size = cfg->elm_size;
        reverse_ring->mode = cfg->mode;
        reverse_ring->asel = cfg->asel;
        memset(&reverse_ring->state, 0, sizeof(reverse_ring->state));
        reverse_ring->ops = &k3_dmaring_reverse_ops;

        reverse_ring->ring_mem_virt = ring->ring_mem_virt;
        reverse_ring->ring_mem_dma = ring->ring_mem_dma;
        reverse_ring->flags |= K3_RING_FLAG_BUSY;
        k3_ringacc_ring_dump(reverse_ring);

        return 0;

err_free_mem:
        dma_free_coherent(ring->dma_dev,
                          ring->size * (4 << ring->elm_size),
                          ring->ring_mem_virt,
                          ring->ring_mem_dma);
err_free_ops:
        ring->ops = NULL;
        ring->proxy = NULL;
        ring->dma_dev = NULL;
        ring->asel = 0;
        return ret;
}

int k3_ringacc_ring_cfg(struct k3_ring *ring, struct k3_ring_cfg *cfg)
{
        struct k3_ringacc *ringacc;
        int ret = 0;

        if (!ring || !cfg)
                return -EINVAL;

        ringacc = ring->parent;

        if (ringacc->dma_rings)
                return k3_dmaring_cfg(ring, cfg);

        if (cfg->elm_size > K3_RINGACC_RING_ELSIZE_256 ||
            cfg->mode >= K3_RINGACC_RING_MODE_INVALID ||
            cfg->size & ~K3_RINGACC_CFG_RING_SIZE_ELCNT_MASK ||
            !test_bit(ring->ring_id, ringacc->rings_inuse))
                return -EINVAL;

        if (cfg->mode == K3_RINGACC_RING_MODE_MESSAGE &&
            ring->proxy_id == K3_RINGACC_PROXY_NOT_USED &&
            cfg->elm_size > K3_RINGACC_RING_ELSIZE_8) {
                dev_err(ringacc->dev,
                        "Message mode must use proxy for %u element size\n",
                        4 << ring->elm_size);
                return -EINVAL;
        }

        /*
         * In case of shared ring only the first user (master user) can
         * configure the ring. The sequence should be by the client:
         * ring = k3_ringacc_request_ring(ringacc, ring_id, 0); # master user
         * k3_ringacc_ring_cfg(ring, cfg); # master configuration
         * k3_ringacc_request_ring(ringacc, ring_id, K3_RING_FLAG_SHARED);
         * k3_ringacc_request_ring(ringacc, ring_id, K3_RING_FLAG_SHARED);
         */
        if (ring->use_count != 1)
                return 0;

        ring->size = cfg->size;
        ring->elm_size = cfg->elm_size;
        ring->mode = cfg->mode;
        memset(&ring->state, 0, sizeof(ring->state));

        if (ring->proxy_id != K3_RINGACC_PROXY_NOT_USED)
                ring->proxy = ringacc->proxy_target_base +
                              ring->proxy_id * K3_RINGACC_PROXY_TARGET_STEP;

        switch (ring->mode) {
        case K3_RINGACC_RING_MODE_RING:
                ring->ops = &k3_ring_mode_ring_ops;
                ring->dma_dev = cfg->dma_dev;
                if (!ring->dma_dev)
                        ring->dma_dev = ringacc->dev;
                break;
        case K3_RINGACC_RING_MODE_MESSAGE:
                ring->dma_dev = ringacc->dev;
                if (ring->proxy)
                        ring->ops = &k3_ring_mode_proxy_ops;
                else
                        ring->ops = &k3_ring_mode_msg_ops;
                break;
        default:
                ring->ops = NULL;
                ret = -EINVAL;
                goto err_free_proxy;
        }

        ring->ring_mem_virt = dma_alloc_coherent(ring->dma_dev,
                                                 ring->size * (4 << ring->elm_size),
                                                 &ring->ring_mem_dma, GFP_KERNEL);
        if (!ring->ring_mem_virt) {
                dev_err(ringacc->dev, "Failed to alloc ring mem\n");
                ret = -ENOMEM;
                goto err_free_ops;
        }

        ret = k3_ringacc_ring_cfg_sci(ring);

        if (ret)
                goto err_free_mem;

        ring->flags |= K3_RING_FLAG_BUSY;
        ring->flags |= (cfg->flags & K3_RINGACC_RING_SHARED) ?
                        K3_RING_FLAG_SHARED : 0;

        k3_ringacc_ring_dump(ring);

        return 0;

err_free_mem:
        dma_free_coherent(ring->dma_dev,
                          ring->size * (4 << ring->elm_size),
                          ring->ring_mem_virt,
                          ring->ring_mem_dma);
err_free_ops:
        ring->ops = NULL;
        ring->dma_dev = NULL;
err_free_proxy:
        ring->proxy = NULL;
        return ret;
}
EXPORT_SYMBOL_GPL(k3_ringacc_ring_cfg);

u32 k3_ringacc_ring_get_size(struct k3_ring *ring)
{
        if (!ring || !(ring->flags & K3_RING_FLAG_BUSY))
                return -EINVAL;

        return ring->size;
}
EXPORT_SYMBOL_GPL(k3_ringacc_ring_get_size);

u32 k3_ringacc_ring_get_free(struct k3_ring *ring)
{
        if (!ring || !(ring->flags & K3_RING_FLAG_BUSY))
                return -EINVAL;

        if (!ring->state.free)
                ring->state.free = ring->size - k3_ringacc_ring_read_occ(ring);

        return ring->state.free;
}
EXPORT_SYMBOL_GPL(k3_ringacc_ring_get_free);

u32 k3_ringacc_ring_get_occ(struct k3_ring *ring)
{
        if (!ring || !(ring->flags & K3_RING_FLAG_BUSY))
                return -EINVAL;

        return k3_ringacc_ring_read_occ(ring);
}
EXPORT_SYMBOL_GPL(k3_ringacc_ring_get_occ);

u32 k3_ringacc_ring_is_full(struct k3_ring *ring)
{
        return !k3_ringacc_ring_get_free(ring);
}
EXPORT_SYMBOL_GPL(k3_ringacc_ring_is_full);

enum k3_ringacc_access_mode {
        K3_RINGACC_ACCESS_MODE_PUSH_HEAD,
        K3_RINGACC_ACCESS_MODE_POP_HEAD,
        K3_RINGACC_ACCESS_MODE_PUSH_TAIL,
        K3_RINGACC_ACCESS_MODE_POP_TAIL,
        K3_RINGACC_ACCESS_MODE_PEEK_HEAD,
        K3_RINGACC_ACCESS_MODE_PEEK_TAIL,
};

#define K3_RINGACC_PROXY_MODE(x)        (((x) & 0x3) << 16)
#define K3_RINGACC_PROXY_ELSIZE(x)      (((x) & 0x7) << 24)
static int k3_ringacc_ring_cfg_proxy(struct k3_ring *ring,
                                     enum k3_ringacc_proxy_access_mode mode)
{
        u32 val;

        val = ring->ring_id;
        val |= K3_RINGACC_PROXY_MODE(mode);
        val |= K3_RINGACC_PROXY_ELSIZE(ring->elm_size);
        writel(val, &ring->proxy->control);
        return 0;
}

static int k3_ringacc_ring_access_proxy(struct k3_ring *ring, void *elem,
                                        enum k3_ringacc_access_mode access_mode)
{
        void __iomem *ptr;

        ptr = (void __iomem *)&ring->proxy->data;

        switch (access_mode) {
        case K3_RINGACC_ACCESS_MODE_PUSH_HEAD:
        case K3_RINGACC_ACCESS_MODE_POP_HEAD:
                k3_ringacc_ring_cfg_proxy(ring, PROXY_ACCESS_MODE_HEAD);
                break;
        case K3_RINGACC_ACCESS_MODE_PUSH_TAIL:
        case K3_RINGACC_ACCESS_MODE_POP_TAIL:
                k3_ringacc_ring_cfg_proxy(ring, PROXY_ACCESS_MODE_TAIL);
                break;
        default:
                return -EINVAL;
        }

        ptr += k3_ringacc_ring_get_fifo_pos(ring);

        switch (access_mode) {
        case K3_RINGACC_ACCESS_MODE_POP_HEAD:
        case K3_RINGACC_ACCESS_MODE_POP_TAIL:
                dev_dbg(ring->parent->dev,
                        "proxy:memcpy_fromio(x): --> ptr(%p), mode:%d\n", ptr,
                        access_mode);
                memcpy_fromio(elem, ptr, (4 << ring->elm_size));
                ring->state.occ--;
                break;
        case K3_RINGACC_ACCESS_MODE_PUSH_TAIL:
        case K3_RINGACC_ACCESS_MODE_PUSH_HEAD:
                dev_dbg(ring->parent->dev,
                        "proxy:memcpy_toio(x): --> ptr(%p), mode:%d\n", ptr,
                        access_mode);
                memcpy_toio(ptr, elem, (4 << ring->elm_size));
                ring->state.free--;
                break;
        default:
                return -EINVAL;
        }

        dev_dbg(ring->parent->dev, "proxy: free%d occ%d\n", ring->state.free,
                ring->state.occ);
        return 0;
}

static int k3_ringacc_ring_push_head_proxy(struct k3_ring *ring, void *elem)
{
        return k3_ringacc_ring_access_proxy(ring, elem,
                                            K3_RINGACC_ACCESS_MODE_PUSH_HEAD);
}

static int k3_ringacc_ring_push_tail_proxy(struct k3_ring *ring, void *elem)
{
        return k3_ringacc_ring_access_proxy(ring, elem,
                                            K3_RINGACC_ACCESS_MODE_PUSH_TAIL);
}

static int k3_ringacc_ring_pop_head_proxy(struct k3_ring *ring, void *elem)
{
        return k3_ringacc_ring_access_proxy(ring, elem,
                                            K3_RINGACC_ACCESS_MODE_POP_HEAD);
}

static int k3_ringacc_ring_pop_tail_proxy(struct k3_ring *ring, void *elem)
{
        return k3_ringacc_ring_access_proxy(ring, elem,
                                            K3_RINGACC_ACCESS_MODE_POP_HEAD);
}

static int k3_ringacc_ring_access_io(struct k3_ring *ring, void *elem,
                                     enum k3_ringacc_access_mode access_mode)
{
        void __iomem *ptr;

        switch (access_mode) {
        case K3_RINGACC_ACCESS_MODE_PUSH_HEAD:
        case K3_RINGACC_ACCESS_MODE_POP_HEAD:
                ptr = (void __iomem *)&ring->fifos->head_data;
                break;
        case K3_RINGACC_ACCESS_MODE_PUSH_TAIL:
        case K3_RINGACC_ACCESS_MODE_POP_TAIL:
                ptr = (void __iomem *)&ring->fifos->tail_data;
                break;
        default:
                return -EINVAL;
        }

        ptr += k3_ringacc_ring_get_fifo_pos(ring);

        switch (access_mode) {
        case K3_RINGACC_ACCESS_MODE_POP_HEAD:
        case K3_RINGACC_ACCESS_MODE_POP_TAIL:
                dev_dbg(ring->parent->dev,
                        "memcpy_fromio(x): --> ptr(%p), mode:%d\n", ptr,
                        access_mode);
                memcpy_fromio(elem, ptr, (4 << ring->elm_size));
                ring->state.occ--;
                break;
        case K3_RINGACC_ACCESS_MODE_PUSH_TAIL:
        case K3_RINGACC_ACCESS_MODE_PUSH_HEAD:
                dev_dbg(ring->parent->dev,
                        "memcpy_toio(x): --> ptr(%p), mode:%d\n", ptr,
                        access_mode);
                memcpy_toio(ptr, elem, (4 << ring->elm_size));
                ring->state.free--;
                break;
        default:
                return -EINVAL;
        }

        dev_dbg(ring->parent->dev, "free%d index%d occ%d index%d\n",
                ring->state.free, ring->state.windex, ring->state.occ,
                ring->state.rindex);
        return 0;
}

static int k3_ringacc_ring_push_head_io(struct k3_ring *ring, void *elem)
{
        return k3_ringacc_ring_access_io(ring, elem,
                                         K3_RINGACC_ACCESS_MODE_PUSH_HEAD);
}

static int k3_ringacc_ring_push_io(struct k3_ring *ring, void *elem)
{
        return k3_ringacc_ring_access_io(ring, elem,
                                         K3_RINGACC_ACCESS_MODE_PUSH_TAIL);
}

static int k3_ringacc_ring_pop_io(struct k3_ring *ring, void *elem)
{
        return k3_ringacc_ring_access_io(ring, elem,
                                         K3_RINGACC_ACCESS_MODE_POP_HEAD);
}

static int k3_ringacc_ring_pop_tail_io(struct k3_ring *ring, void *elem)
{
        return k3_ringacc_ring_access_io(ring, elem,
                                         K3_RINGACC_ACCESS_MODE_POP_HEAD);
}

/*
 * The element is 48 bits of address + ASEL bits in the ring.
 * ASEL is used by the DMAs and should be removed for the kernel as it is not
 * part of the physical memory address.
 */
static void k3_dmaring_remove_asel_from_elem(u64 *elem)
{
        *elem &= GENMASK_ULL(K3_ADDRESS_ASEL_SHIFT - 1, 0);
}

static int k3_dmaring_fwd_pop(struct k3_ring *ring, void *elem)
{
        void *elem_ptr;
        u32 elem_idx;

        /*
         * DMA rings: forward ring is always tied DMA channel and HW does not
         * maintain any state data required for POP operation and its unknown
         * how much elements were consumed by HW. So, to actually
         * do POP, the read pointer has to be recalculated every time.
         */
        ring->state.occ = k3_ringacc_ring_read_occ(ring);
        if (ring->state.windex >= ring->state.occ)
                elem_idx = ring->state.windex - ring->state.occ;
        else
                elem_idx = ring->size - (ring->state.occ - ring->state.windex);

        elem_ptr = k3_ringacc_get_elm_addr(ring, elem_idx);
        memcpy(elem, elem_ptr, (4 << ring->elm_size));
        k3_dmaring_remove_asel_from_elem(elem);

        ring->state.occ--;
        writel(-1, &ring->rt->db);

        dev_dbg(ring->parent->dev, "%s: occ%d Windex%d Rindex%d pos_ptr%px\n",
                __func__, ring->state.occ, ring->state.windex, elem_idx,
                elem_ptr);
        return 0;
}

static int k3_dmaring_reverse_pop(struct k3_ring *ring, void *elem)
{
        void *elem_ptr;

        elem_ptr = k3_ringacc_get_elm_addr(ring, ring->state.rindex);

        if (ring->state.occ) {
                memcpy(elem, elem_ptr, (4 << ring->elm_size));
                k3_dmaring_remove_asel_from_elem(elem);

                ring->state.rindex = (ring->state.rindex + 1) % ring->size;
                ring->state.occ--;
                writel(-1 & K3_DMARING_RT_DB_ENTRY_MASK, &ring->rt->db);
        } else if (ring->state.tdown_complete) {
                dma_addr_t *value = elem;

                *value = CPPI5_TDCM_MARKER;
                writel(K3_DMARING_RT_DB_TDOWN_ACK, &ring->rt->db);
                ring->state.tdown_complete = false;
        }

        dev_dbg(ring->parent->dev, "%s: occ%d index%d pos_ptr%px\n",
                __func__, ring->state.occ, ring->state.rindex, elem_ptr);
        return 0;
}

static int k3_ringacc_ring_push_mem(struct k3_ring *ring, void *elem)
{
        void *elem_ptr;

        elem_ptr = k3_ringacc_get_elm_addr(ring, ring->state.windex);

        memcpy(elem_ptr, elem, (4 << ring->elm_size));
        if (ring->parent->dma_rings) {
                u64 *addr = elem_ptr;

                *addr |= ((u64)ring->asel << K3_ADDRESS_ASEL_SHIFT);
        }

        ring->state.windex = (ring->state.windex + 1) % ring->size;
        ring->state.free--;
        writel(1, &ring->rt->db);

        dev_dbg(ring->parent->dev, "ring_push_mem: free%d index%d\n",
                ring->state.free, ring->state.windex);

        return 0;
}

static int k3_ringacc_ring_pop_mem(struct k3_ring *ring, void *elem)
{
        void *elem_ptr;

        elem_ptr = k3_ringacc_get_elm_addr(ring, ring->state.rindex);

        memcpy(elem, elem_ptr, (4 << ring->elm_size));

        ring->state.rindex = (ring->state.rindex + 1) % ring->size;
        ring->state.occ--;
        writel(-1, &ring->rt->db);

        dev_dbg(ring->parent->dev, "ring_pop_mem: occ%d index%d pos_ptr%p\n",
                ring->state.occ, ring->state.rindex, elem_ptr);
        return 0;
}

int k3_ringacc_ring_push(struct k3_ring *ring, void *elem)
{
        int ret = -EOPNOTSUPP;

        if (!ring || !(ring->flags & K3_RING_FLAG_BUSY))
                return -EINVAL;

        dev_dbg(ring->parent->dev, "ring_push: free%d index%d\n",
                ring->state.free, ring->state.windex);

        if (k3_ringacc_ring_is_full(ring))
                return -ENOMEM;

        if (ring->ops && ring->ops->push_tail)
                ret = ring->ops->push_tail(ring, elem);

        return ret;
}
EXPORT_SYMBOL_GPL(k3_ringacc_ring_push);

int k3_ringacc_ring_push_head(struct k3_ring *ring, void *elem)
{
        int ret = -EOPNOTSUPP;

        if (!ring || !(ring->flags & K3_RING_FLAG_BUSY))
                return -EINVAL;

        dev_dbg(ring->parent->dev, "ring_push_head: free%d index%d\n",
                ring->state.free, ring->state.windex);

        if (k3_ringacc_ring_is_full(ring))
                return -ENOMEM;

        if (ring->ops && ring->ops->push_head)
                ret = ring->ops->push_head(ring, elem);

        return ret;
}
EXPORT_SYMBOL_GPL(k3_ringacc_ring_push_head);

int k3_ringacc_ring_pop(struct k3_ring *ring, void *elem)
{
        int ret = -EOPNOTSUPP;

        if (!ring || !(ring->flags & K3_RING_FLAG_BUSY))
                return -EINVAL;

        if (!ring->state.occ)
                k3_ringacc_ring_update_occ(ring);

        dev_dbg(ring->parent->dev, "ring_pop: occ%d index%d\n", ring->state.occ,
                ring->state.rindex);

        if (!ring->state.occ && !ring->state.tdown_complete)
                return -ENODATA;

        if (ring->ops && ring->ops->pop_head)
                ret = ring->ops->pop_head(ring, elem);

        return ret;
}
EXPORT_SYMBOL_GPL(k3_ringacc_ring_pop);

int k3_ringacc_ring_pop_tail(struct k3_ring *ring, void *elem)
{
        int ret = -EOPNOTSUPP;

        if (!ring || !(ring->flags & K3_RING_FLAG_BUSY))
                return -EINVAL;

        if (!ring->state.occ)
                k3_ringacc_ring_update_occ(ring);

        dev_dbg(ring->parent->dev, "ring_pop_tail: occ%d index%d\n",
                ring->state.occ, ring->state.rindex);

        if (!ring->state.occ)
                return -ENODATA;

        if (ring->ops && ring->ops->pop_tail)
                ret = ring->ops->pop_tail(ring, elem);

        return ret;
}
EXPORT_SYMBOL_GPL(k3_ringacc_ring_pop_tail);

struct k3_ringacc *of_k3_ringacc_get_by_phandle(struct device_node *np,
                                                const char *property)
{
        struct device_node *ringacc_np;
        struct k3_ringacc *ringacc = ERR_PTR(-EPROBE_DEFER);
        struct k3_ringacc *entry;

        ringacc_np = of_parse_phandle(np, property, 0);
        if (!ringacc_np)
                return ERR_PTR(-ENODEV);

        mutex_lock(&k3_ringacc_list_lock);
        list_for_each_entry(entry, &k3_ringacc_list, list)
                if (device_match_of_node(entry->dev, ringacc_np)) {
                        ringacc = entry;
                        break;
                }
        mutex_unlock(&k3_ringacc_list_lock);
        of_node_put(ringacc_np);

        return ringacc;
}
EXPORT_SYMBOL_GPL(of_k3_ringacc_get_by_phandle);

static int k3_ringacc_probe_dt(struct k3_ringacc *ringacc)
{
        struct device_node *node = ringacc->dev->of_node;
        struct device *dev = ringacc->dev;
        struct platform_device *pdev = to_platform_device(dev);
        int ret;

        if (!node) {
                dev_err(dev, "device tree info unavailable\n");
                return -ENODEV;
        }

        ret = of_property_read_u32(node, "ti,num-rings", &ringacc->num_rings);
        if (ret) {
                dev_err(dev, "ti,num-rings read failure %d\n", ret);
                return ret;
        }

        ringacc->tisci = ti_sci_get_by_phandle(node, "ti,sci");
        if (IS_ERR(ringacc->tisci)) {
                ret = PTR_ERR(ringacc->tisci);
                if (ret != -EPROBE_DEFER)
                        dev_err(dev, "ti,sci read fail %d\n", ret);
                ringacc->tisci = NULL;
                return ret;
        }

        ret = of_property_read_u32(node, "ti,sci-dev-id",
                                   &ringacc->tisci_dev_id);
        if (ret) {
                dev_err(dev, "ti,sci-dev-id read fail %d\n", ret);
                return ret;
        }

        pdev->id = ringacc->tisci_dev_id;

        ringacc->rm_gp_range = devm_ti_sci_get_of_resource(ringacc->tisci, dev,
                                                ringacc->tisci_dev_id,
                                                "ti,sci-rm-range-gp-rings");
        if (IS_ERR(ringacc->rm_gp_range)) {
                dev_err(dev, "Failed to allocate MSI interrupts\n");
                return PTR_ERR(ringacc->rm_gp_range);
        }

        return ti_sci_inta_msi_domain_alloc_irqs(ringacc->dev,
                                                 ringacc->rm_gp_range);
}

static const struct k3_ringacc_soc_data k3_ringacc_soc_data_sr1 = {
        .dma_ring_reset_quirk = 1,
};

static const struct soc_device_attribute k3_ringacc_socinfo[] = {
        { .family = "AM65X",
          .revision = "SR1.0",
          .data = &k3_ringacc_soc_data_sr1
        },
        {/* sentinel */}
};

static int k3_ringacc_init(struct platform_device *pdev,
                           struct k3_ringacc *ringacc)
{
        const struct soc_device_attribute *soc;
        void __iomem *base_fifo, *base_rt;
        struct device *dev = &pdev->dev;
        int ret, i;

        dev->msi.domain = of_msi_get_domain(dev, dev->of_node,
                                            DOMAIN_BUS_TI_SCI_INTA_MSI);
        if (!dev->msi.domain)
                return -EPROBE_DEFER;

        ret = k3_ringacc_probe_dt(ringacc);
        if (ret)
                return ret;

        soc = soc_device_match(k3_ringacc_socinfo);
        if (soc && soc->data) {
                const struct k3_ringacc_soc_data *soc_data = soc->data;

                ringacc->dma_ring_reset_quirk = soc_data->dma_ring_reset_quirk;
        }

        base_rt = devm_platform_ioremap_resource_byname(pdev, "rt");
        if (IS_ERR(base_rt))
                return PTR_ERR(base_rt);

        base_fifo = devm_platform_ioremap_resource_byname(pdev, "fifos");
        if (IS_ERR(base_fifo))
                return PTR_ERR(base_fifo);

        ringacc->proxy_gcfg = devm_platform_ioremap_resource_byname(pdev, "proxy_gcfg");
        if (IS_ERR(ringacc->proxy_gcfg))
                return PTR_ERR(ringacc->proxy_gcfg);

        ringacc->proxy_target_base = devm_platform_ioremap_resource_byname(pdev,
                                                                           "proxy_target");
        if (IS_ERR(ringacc->proxy_target_base))
                return PTR_ERR(ringacc->proxy_target_base);

        ringacc->num_proxies = readl(&ringacc->proxy_gcfg->config) &
                                     K3_RINGACC_PROXY_CFG_THREADS_MASK;

        ringacc->rings = devm_kzalloc(dev,
                                      sizeof(*ringacc->rings) *
                                      ringacc->num_rings,
                                      GFP_KERNEL);
        ringacc->rings_inuse = devm_bitmap_zalloc(dev, ringacc->num_rings,
                                                  GFP_KERNEL);
        ringacc->proxy_inuse = devm_bitmap_zalloc(dev, ringacc->num_proxies,
                                                  GFP_KERNEL);

        if (!ringacc->rings || !ringacc->rings_inuse || !ringacc->proxy_inuse)
                return -ENOMEM;

        for (i = 0; i < ringacc->num_rings; i++) {
                ringacc->rings[i].rt = base_rt +
                                       K3_RINGACC_RT_REGS_STEP * i;
                ringacc->rings[i].fifos = base_fifo +
                                          K3_RINGACC_FIFO_REGS_STEP * i;
                ringacc->rings[i].parent = ringacc;
                ringacc->rings[i].ring_id = i;
                ringacc->rings[i].proxy_id = K3_RINGACC_PROXY_NOT_USED;
        }

        ringacc->tisci_ring_ops = &ringacc->tisci->ops.rm_ring_ops;

        dev_info(dev, "Ring Accelerator probed rings:%u, gp-rings[%u,%u] sci-dev-id:%u\n",
                 ringacc->num_rings,
                 ringacc->rm_gp_range->desc[0].start,
                 ringacc->rm_gp_range->desc[0].num,
                 ringacc->tisci_dev_id);
        dev_info(dev, "dma-ring-reset-quirk: %s\n",
                 ringacc->dma_ring_reset_quirk ? "enabled" : "disabled");
        dev_info(dev, "RA Proxy rev. %08x, num_proxies:%u\n",
                 readl(&ringacc->proxy_gcfg->revision), ringacc->num_proxies);

        return 0;
}

struct ringacc_match_data {
        struct k3_ringacc_ops ops;
};

static struct ringacc_match_data k3_ringacc_data = {
        .ops = {
                .init = k3_ringacc_init,
        },
};

/* Match table for of_platform binding */
static const struct of_device_id k3_ringacc_of_match[] = {
        { .compatible = "ti,am654-navss-ringacc", .data = &k3_ringacc_data, },
        {},
};
MODULE_DEVICE_TABLE(of, k3_ringacc_of_match);

struct k3_ringacc *k3_ringacc_dmarings_init(struct platform_device *pdev,
                                            struct k3_ringacc_init_data *data)
{
        struct device *dev = &pdev->dev;
        struct k3_ringacc *ringacc;
        void __iomem *base_rt;
        int i;

        ringacc = devm_kzalloc(dev, sizeof(*ringacc), GFP_KERNEL);
        if (!ringacc)
                return ERR_PTR(-ENOMEM);

        ringacc->dev = dev;
        ringacc->dma_rings = true;
        ringacc->num_rings = data->num_rings;
        ringacc->tisci = data->tisci;
        ringacc->tisci_dev_id = data->tisci_dev_id;

        mutex_init(&ringacc->req_lock);

        base_rt = devm_platform_ioremap_resource_byname(pdev, "ringrt");
        if (IS_ERR(base_rt))
                return ERR_CAST(base_rt);

        ringacc->rings = devm_kzalloc(dev,
                                      sizeof(*ringacc->rings) *
                                      ringacc->num_rings * 2,
                                      GFP_KERNEL);
        ringacc->rings_inuse = devm_bitmap_zalloc(dev, ringacc->num_rings,
                                                  GFP_KERNEL);

        if (!ringacc->rings || !ringacc->rings_inuse)
                return ERR_PTR(-ENOMEM);

        for (i = 0; i < ringacc->num_rings; i++) {
                struct k3_ring *ring = &ringacc->rings[i];

                ring->rt = base_rt + K3_DMARING_RT_REGS_STEP * i;
                ring->parent = ringacc;
                ring->ring_id = i;
                ring->proxy_id = K3_RINGACC_PROXY_NOT_USED;

                ring = &ringacc->rings[ringacc->num_rings + i];
                ring->rt = base_rt + K3_DMARING_RT_REGS_STEP * i +
                           K3_DMARING_RT_REGS_REVERSE_OFS;
                ring->parent = ringacc;
                ring->ring_id = i;
                ring->proxy_id = K3_RINGACC_PROXY_NOT_USED;
                ring->flags = K3_RING_FLAG_REVERSE;
        }

        ringacc->tisci_ring_ops = &ringacc->tisci->ops.rm_ring_ops;

        dev_info(dev, "Number of rings: %u\n", ringacc->num_rings);

        return ringacc;
}
EXPORT_SYMBOL_GPL(k3_ringacc_dmarings_init);

static int k3_ringacc_probe(struct platform_device *pdev)
{
        const struct ringacc_match_data *match_data;
        struct device *dev = &pdev->dev;
        struct k3_ringacc *ringacc;
        int ret;

        match_data = of_device_get_match_data(&pdev->dev);
        if (!match_data)
                return -ENODEV;

        ringacc = devm_kzalloc(dev, sizeof(*ringacc), GFP_KERNEL);
        if (!ringacc)
                return -ENOMEM;

        ringacc->dev = dev;
        mutex_init(&ringacc->req_lock);
        ringacc->ops = &match_data->ops;

        ret = ringacc->ops->init(pdev, ringacc);
        if (ret)
                return ret;

        dev_set_drvdata(dev, ringacc);

        mutex_lock(&k3_ringacc_list_lock);
        list_add_tail(&ringacc->list, &k3_ringacc_list);
        mutex_unlock(&k3_ringacc_list_lock);

        return 0;
}

static void k3_ringacc_remove(struct platform_device *pdev)
{
        struct k3_ringacc *ringacc = dev_get_drvdata(&pdev->dev);

        mutex_lock(&k3_ringacc_list_lock);
        list_del(&ringacc->list);
        mutex_unlock(&k3_ringacc_list_lock);
}

static struct platform_driver k3_ringacc_driver = {
        .probe          = k3_ringacc_probe,
        .remove         = k3_ringacc_remove,
        .driver         = {
                .name   = "k3-ringacc",
                .of_match_table = k3_ringacc_of_match,
                .suppress_bind_attrs = true,
        },
};
module_platform_driver(k3_ringacc_driver);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("TI Ringacc driver for K3 SOCs");
MODULE_AUTHOR("Grygorii Strashko <grygorii.strashko@ti.com>");
Linux
