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-rw-r--r--drivers/soc/ti/knav_qmss_acc.c591
1 files changed, 591 insertions, 0 deletions
diff --git a/drivers/soc/ti/knav_qmss_acc.c b/drivers/soc/ti/knav_qmss_acc.c
new file mode 100644
index 000000000000..6fbfde6e748f
--- /dev/null
+++ b/drivers/soc/ti/knav_qmss_acc.c
@@ -0,0 +1,591 @@
+/*
+ * Keystone accumulator queue manager
+ *
+ * Copyright (C) 2014 Texas Instruments Incorporated - http://www.ti.com
+ * Author: Sandeep Nair <sandeep_n@ti.com>
+ * Cyril Chemparathy <cyril@ti.com>
+ * Santosh Shilimkar <santosh.shilimkar@ti.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.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/io.h>
+#include <linux/interrupt.h>
+#include <linux/bitops.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/soc/ti/knav_qmss.h>
+#include <linux/platform_device.h>
+#include <linux/dma-mapping.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_address.h>
+#include <linux/firmware.h>
+
+#include "knav_qmss.h"
+
+#define knav_range_offset_to_inst(kdev, range, q) \
+ (range->queue_base_inst + (q << kdev->inst_shift))
+
+static void __knav_acc_notify(struct knav_range_info *range,
+ struct knav_acc_channel *acc)
+{
+ struct knav_device *kdev = range->kdev;
+ struct knav_queue_inst *inst;
+ int range_base, queue;
+
+ range_base = kdev->base_id + range->queue_base;
+
+ if (range->flags & RANGE_MULTI_QUEUE) {
+ for (queue = 0; queue < range->num_queues; queue++) {
+ inst = knav_range_offset_to_inst(kdev, range,
+ queue);
+ if (inst->notify_needed) {
+ inst->notify_needed = 0;
+ dev_dbg(kdev->dev, "acc-irq: notifying %d\n",
+ range_base + queue);
+ knav_queue_notify(inst);
+ }
+ }
+ } else {
+ queue = acc->channel - range->acc_info.start_channel;
+ inst = knav_range_offset_to_inst(kdev, range, queue);
+ dev_dbg(kdev->dev, "acc-irq: notifying %d\n",
+ range_base + queue);
+ knav_queue_notify(inst);
+ }
+}
+
+static int knav_acc_set_notify(struct knav_range_info *range,
+ struct knav_queue_inst *kq,
+ bool enabled)
+{
+ struct knav_pdsp_info *pdsp = range->acc_info.pdsp;
+ struct knav_device *kdev = range->kdev;
+ u32 mask, offset;
+
+ /*
+ * when enabling, we need to re-trigger an interrupt if we
+ * have descriptors pending
+ */
+ if (!enabled || atomic_read(&kq->desc_count) <= 0)
+ return 0;
+
+ kq->notify_needed = 1;
+ atomic_inc(&kq->acc->retrigger_count);
+ mask = BIT(kq->acc->channel % 32);
+ offset = ACC_INTD_OFFSET_STATUS(kq->acc->channel);
+ dev_dbg(kdev->dev, "setup-notify: re-triggering irq for %s\n",
+ kq->acc->name);
+ writel_relaxed(mask, pdsp->intd + offset);
+ return 0;
+}
+
+static irqreturn_t knav_acc_int_handler(int irq, void *_instdata)
+{
+ struct knav_acc_channel *acc;
+ struct knav_queue_inst *kq = NULL;
+ struct knav_range_info *range;
+ struct knav_pdsp_info *pdsp;
+ struct knav_acc_info *info;
+ struct knav_device *kdev;
+
+ u32 *list, *list_cpu, val, idx, notifies;
+ int range_base, channel, queue = 0;
+ dma_addr_t list_dma;
+
+ range = _instdata;
+ info = &range->acc_info;
+ kdev = range->kdev;
+ pdsp = range->acc_info.pdsp;
+ acc = range->acc;
+
+ range_base = kdev->base_id + range->queue_base;
+ if ((range->flags & RANGE_MULTI_QUEUE) == 0) {
+ for (queue = 0; queue < range->num_irqs; queue++)
+ if (range->irqs[queue].irq == irq)
+ break;
+ kq = knav_range_offset_to_inst(kdev, range, queue);
+ acc += queue;
+ }
+
+ channel = acc->channel;
+ list_dma = acc->list_dma[acc->list_index];
+ list_cpu = acc->list_cpu[acc->list_index];
+ dev_dbg(kdev->dev, "acc-irq: channel %d, list %d, virt %p, phys %x\n",
+ channel, acc->list_index, list_cpu, list_dma);
+ if (atomic_read(&acc->retrigger_count)) {
+ atomic_dec(&acc->retrigger_count);
+ __knav_acc_notify(range, acc);
+ writel_relaxed(1, pdsp->intd + ACC_INTD_OFFSET_COUNT(channel));
+ /* ack the interrupt */
+ writel_relaxed(ACC_CHANNEL_INT_BASE + channel,
+ pdsp->intd + ACC_INTD_OFFSET_EOI);
+
+ return IRQ_HANDLED;
+ }
+
+ notifies = readl_relaxed(pdsp->intd + ACC_INTD_OFFSET_COUNT(channel));
+ WARN_ON(!notifies);
+ dma_sync_single_for_cpu(kdev->dev, list_dma, info->list_size,
+ DMA_FROM_DEVICE);
+
+ for (list = list_cpu; list < list_cpu + (info->list_size / sizeof(u32));
+ list += ACC_LIST_ENTRY_WORDS) {
+ if (ACC_LIST_ENTRY_WORDS == 1) {
+ dev_dbg(kdev->dev,
+ "acc-irq: list %d, entry @%p, %08x\n",
+ acc->list_index, list, list[0]);
+ } else if (ACC_LIST_ENTRY_WORDS == 2) {
+ dev_dbg(kdev->dev,
+ "acc-irq: list %d, entry @%p, %08x %08x\n",
+ acc->list_index, list, list[0], list[1]);
+ } else if (ACC_LIST_ENTRY_WORDS == 4) {
+ dev_dbg(kdev->dev,
+ "acc-irq: list %d, entry @%p, %08x %08x %08x %08x\n",
+ acc->list_index, list, list[0], list[1],
+ list[2], list[3]);
+ }
+
+ val = list[ACC_LIST_ENTRY_DESC_IDX];
+ if (!val)
+ break;
+
+ if (range->flags & RANGE_MULTI_QUEUE) {
+ queue = list[ACC_LIST_ENTRY_QUEUE_IDX] >> 16;
+ if (queue < range_base ||
+ queue >= range_base + range->num_queues) {
+ dev_err(kdev->dev,
+ "bad queue %d, expecting %d-%d\n",
+ queue, range_base,
+ range_base + range->num_queues);
+ break;
+ }
+ queue -= range_base;
+ kq = knav_range_offset_to_inst(kdev, range,
+ queue);
+ }
+
+ if (atomic_inc_return(&kq->desc_count) >= ACC_DESCS_MAX) {
+ atomic_dec(&kq->desc_count);
+ dev_err(kdev->dev,
+ "acc-irq: queue %d full, entry dropped\n",
+ queue + range_base);
+ continue;
+ }
+
+ idx = atomic_inc_return(&kq->desc_tail) & ACC_DESCS_MASK;
+ kq->descs[idx] = val;
+ kq->notify_needed = 1;
+ dev_dbg(kdev->dev, "acc-irq: enqueue %08x at %d, queue %d\n",
+ val, idx, queue + range_base);
+ }
+
+ __knav_acc_notify(range, acc);
+ memset(list_cpu, 0, info->list_size);
+ dma_sync_single_for_device(kdev->dev, list_dma, info->list_size,
+ DMA_TO_DEVICE);
+
+ /* flip to the other list */
+ acc->list_index ^= 1;
+
+ /* reset the interrupt counter */
+ writel_relaxed(1, pdsp->intd + ACC_INTD_OFFSET_COUNT(channel));
+
+ /* ack the interrupt */
+ writel_relaxed(ACC_CHANNEL_INT_BASE + channel,
+ pdsp->intd + ACC_INTD_OFFSET_EOI);
+
+ return IRQ_HANDLED;
+}
+
+int knav_range_setup_acc_irq(struct knav_range_info *range,
+ int queue, bool enabled)
+{
+ struct knav_device *kdev = range->kdev;
+ struct knav_acc_channel *acc;
+ unsigned long cpu_map;
+ int ret = 0, irq;
+ u32 old, new;
+
+ if (range->flags & RANGE_MULTI_QUEUE) {
+ acc = range->acc;
+ irq = range->irqs[0].irq;
+ cpu_map = range->irqs[0].cpu_map;
+ } else {
+ acc = range->acc + queue;
+ irq = range->irqs[queue].irq;
+ cpu_map = range->irqs[queue].cpu_map;
+ }
+
+ old = acc->open_mask;
+ if (enabled)
+ new = old | BIT(queue);
+ else
+ new = old & ~BIT(queue);
+ acc->open_mask = new;
+
+ dev_dbg(kdev->dev,
+ "setup-acc-irq: open mask old %08x, new %08x, channel %s\n",
+ old, new, acc->name);
+
+ if (likely(new == old))
+ return 0;
+
+ if (new && !old) {
+ dev_dbg(kdev->dev,
+ "setup-acc-irq: requesting %s for channel %s\n",
+ acc->name, acc->name);
+ ret = request_irq(irq, knav_acc_int_handler, 0, acc->name,
+ range);
+ if (!ret && cpu_map) {
+ ret = irq_set_affinity_hint(irq, to_cpumask(&cpu_map));
+ if (ret) {
+ dev_warn(range->kdev->dev,
+ "Failed to set IRQ affinity\n");
+ return ret;
+ }
+ }
+ }
+
+ if (old && !new) {
+ dev_dbg(kdev->dev, "setup-acc-irq: freeing %s for channel %s\n",
+ acc->name, acc->name);
+ free_irq(irq, range);
+ }
+
+ return ret;
+}
+
+static const char *knav_acc_result_str(enum knav_acc_result result)
+{
+ static const char * const result_str[] = {
+ [ACC_RET_IDLE] = "idle",
+ [ACC_RET_SUCCESS] = "success",
+ [ACC_RET_INVALID_COMMAND] = "invalid command",
+ [ACC_RET_INVALID_CHANNEL] = "invalid channel",
+ [ACC_RET_INACTIVE_CHANNEL] = "inactive channel",
+ [ACC_RET_ACTIVE_CHANNEL] = "active channel",
+ [ACC_RET_INVALID_QUEUE] = "invalid queue",
+ [ACC_RET_INVALID_RET] = "invalid return code",
+ };
+
+ if (result >= ARRAY_SIZE(result_str))
+ return result_str[ACC_RET_INVALID_RET];
+ else
+ return result_str[result];
+}
+
+static enum knav_acc_result
+knav_acc_write(struct knav_device *kdev, struct knav_pdsp_info *pdsp,
+ struct knav_reg_acc_command *cmd)
+{
+ u32 result;
+
+ dev_dbg(kdev->dev, "acc command %08x %08x %08x %08x %08x\n",
+ cmd->command, cmd->queue_mask, cmd->list_phys,
+ cmd->queue_num, cmd->timer_config);
+
+ writel_relaxed(cmd->timer_config, &pdsp->acc_command->timer_config);
+ writel_relaxed(cmd->queue_num, &pdsp->acc_command->queue_num);
+ writel_relaxed(cmd->list_phys, &pdsp->acc_command->list_phys);
+ writel_relaxed(cmd->queue_mask, &pdsp->acc_command->queue_mask);
+ writel_relaxed(cmd->command, &pdsp->acc_command->command);
+
+ /* wait for the command to clear */
+ do {
+ result = readl_relaxed(&pdsp->acc_command->command);
+ } while ((result >> 8) & 0xff);
+
+ return (result >> 24) & 0xff;
+}
+
+static void knav_acc_setup_cmd(struct knav_device *kdev,
+ struct knav_range_info *range,
+ struct knav_reg_acc_command *cmd,
+ int queue)
+{
+ struct knav_acc_info *info = &range->acc_info;
+ struct knav_acc_channel *acc;
+ int queue_base;
+ u32 queue_mask;
+
+ if (range->flags & RANGE_MULTI_QUEUE) {
+ acc = range->acc;
+ queue_base = range->queue_base;
+ queue_mask = BIT(range->num_queues) - 1;
+ } else {
+ acc = range->acc + queue;
+ queue_base = range->queue_base + queue;
+ queue_mask = 0;
+ }
+
+ memset(cmd, 0, sizeof(*cmd));
+ cmd->command = acc->channel;
+ cmd->queue_mask = queue_mask;
+ cmd->list_phys = acc->list_dma[0];
+ cmd->queue_num = info->list_entries << 16;
+ cmd->queue_num |= queue_base;
+
+ cmd->timer_config = ACC_LIST_ENTRY_TYPE << 18;
+ if (range->flags & RANGE_MULTI_QUEUE)
+ cmd->timer_config |= ACC_CFG_MULTI_QUEUE;
+ cmd->timer_config |= info->pacing_mode << 16;
+ cmd->timer_config |= info->timer_count;
+}
+
+static void knav_acc_stop(struct knav_device *kdev,
+ struct knav_range_info *range,
+ int queue)
+{
+ struct knav_reg_acc_command cmd;
+ struct knav_acc_channel *acc;
+ enum knav_acc_result result;
+
+ acc = range->acc + queue;
+
+ knav_acc_setup_cmd(kdev, range, &cmd, queue);
+ cmd.command |= ACC_CMD_DISABLE_CHANNEL << 8;
+ result = knav_acc_write(kdev, range->acc_info.pdsp, &cmd);
+
+ dev_dbg(kdev->dev, "stopped acc channel %s, result %s\n",
+ acc->name, knav_acc_result_str(result));
+}
+
+static enum knav_acc_result knav_acc_start(struct knav_device *kdev,
+ struct knav_range_info *range,
+ int queue)
+{
+ struct knav_reg_acc_command cmd;
+ struct knav_acc_channel *acc;
+ enum knav_acc_result result;
+
+ acc = range->acc + queue;
+
+ knav_acc_setup_cmd(kdev, range, &cmd, queue);
+ cmd.command |= ACC_CMD_ENABLE_CHANNEL << 8;
+ result = knav_acc_write(kdev, range->acc_info.pdsp, &cmd);
+
+ dev_dbg(kdev->dev, "started acc channel %s, result %s\n",
+ acc->name, knav_acc_result_str(result));
+
+ return result;
+}
+
+static int knav_acc_init_range(struct knav_range_info *range)
+{
+ struct knav_device *kdev = range->kdev;
+ struct knav_acc_channel *acc;
+ enum knav_acc_result result;
+ int queue;
+
+ for (queue = 0; queue < range->num_queues; queue++) {
+ acc = range->acc + queue;
+
+ knav_acc_stop(kdev, range, queue);
+ acc->list_index = 0;
+ result = knav_acc_start(kdev, range, queue);
+
+ if (result != ACC_RET_SUCCESS)
+ return -EIO;
+
+ if (range->flags & RANGE_MULTI_QUEUE)
+ return 0;
+ }
+ return 0;
+}
+
+static int knav_acc_init_queue(struct knav_range_info *range,
+ struct knav_queue_inst *kq)
+{
+ unsigned id = kq->id - range->queue_base;
+
+ kq->descs = devm_kzalloc(range->kdev->dev,
+ ACC_DESCS_MAX * sizeof(u32), GFP_KERNEL);
+ if (!kq->descs)
+ return -ENOMEM;
+
+ kq->acc = range->acc;
+ if ((range->flags & RANGE_MULTI_QUEUE) == 0)
+ kq->acc += id;
+ return 0;
+}
+
+static int knav_acc_open_queue(struct knav_range_info *range,
+ struct knav_queue_inst *inst, unsigned flags)
+{
+ unsigned id = inst->id - range->queue_base;
+
+ return knav_range_setup_acc_irq(range, id, true);
+}
+
+static int knav_acc_close_queue(struct knav_range_info *range,
+ struct knav_queue_inst *inst)
+{
+ unsigned id = inst->id - range->queue_base;
+
+ return knav_range_setup_acc_irq(range, id, false);
+}
+
+static int knav_acc_free_range(struct knav_range_info *range)
+{
+ struct knav_device *kdev = range->kdev;
+ struct knav_acc_channel *acc;
+ struct knav_acc_info *info;
+ int channel, channels;
+
+ info = &range->acc_info;
+
+ if (range->flags & RANGE_MULTI_QUEUE)
+ channels = 1;
+ else
+ channels = range->num_queues;
+
+ for (channel = 0; channel < channels; channel++) {
+ acc = range->acc + channel;
+ if (!acc->list_cpu[0])
+ continue;
+ dma_unmap_single(kdev->dev, acc->list_dma[0],
+ info->mem_size, DMA_BIDIRECTIONAL);
+ free_pages_exact(acc->list_cpu[0], info->mem_size);
+ }
+ devm_kfree(range->kdev->dev, range->acc);
+ return 0;
+}
+
+struct knav_range_ops knav_acc_range_ops = {
+ .set_notify = knav_acc_set_notify,
+ .init_queue = knav_acc_init_queue,
+ .open_queue = knav_acc_open_queue,
+ .close_queue = knav_acc_close_queue,
+ .init_range = knav_acc_init_range,
+ .free_range = knav_acc_free_range,
+};
+
+/**
+ * knav_init_acc_range: Initialise accumulator ranges
+ *
+ * @kdev: qmss device
+ * @node: device node
+ * @range: qmms range information
+ *
+ * Return 0 on success or error
+ */
+int knav_init_acc_range(struct knav_device *kdev,
+ struct device_node *node,
+ struct knav_range_info *range)
+{
+ struct knav_acc_channel *acc;
+ struct knav_pdsp_info *pdsp;
+ struct knav_acc_info *info;
+ int ret, channel, channels;
+ int list_size, mem_size;
+ dma_addr_t list_dma;
+ void *list_mem;
+ u32 config[5];
+
+ range->flags |= RANGE_HAS_ACCUMULATOR;
+ info = &range->acc_info;
+
+ ret = of_property_read_u32_array(node, "accumulator", config, 5);
+ if (ret)
+ return ret;
+
+ info->pdsp_id = config[0];
+ info->start_channel = config[1];
+ info->list_entries = config[2];
+ info->pacing_mode = config[3];
+ info->timer_count = config[4] / ACC_DEFAULT_PERIOD;
+
+ if (info->start_channel > ACC_MAX_CHANNEL) {
+ dev_err(kdev->dev, "channel %d invalid for range %s\n",
+ info->start_channel, range->name);
+ return -EINVAL;
+ }
+
+ if (info->pacing_mode > 3) {
+ dev_err(kdev->dev, "pacing mode %d invalid for range %s\n",
+ info->pacing_mode, range->name);
+ return -EINVAL;
+ }
+
+ pdsp = knav_find_pdsp(kdev, info->pdsp_id);
+ if (!pdsp) {
+ dev_err(kdev->dev, "pdsp id %d not found for range %s\n",
+ info->pdsp_id, range->name);
+ return -EINVAL;
+ }
+
+ info->pdsp = pdsp;
+ channels = range->num_queues;
+ if (of_get_property(node, "multi-queue", NULL)) {
+ range->flags |= RANGE_MULTI_QUEUE;
+ channels = 1;
+ if (range->queue_base & (32 - 1)) {
+ dev_err(kdev->dev,
+ "misaligned multi-queue accumulator range %s\n",
+ range->name);
+ return -EINVAL;
+ }
+ if (range->num_queues > 32) {
+ dev_err(kdev->dev,
+ "too many queues in accumulator range %s\n",
+ range->name);
+ return -EINVAL;
+ }
+ }
+
+ /* figure out list size */
+ list_size = info->list_entries;
+ list_size *= ACC_LIST_ENTRY_WORDS * sizeof(u32);
+ info->list_size = list_size;
+ mem_size = PAGE_ALIGN(list_size * 2);
+ info->mem_size = mem_size;
+ range->acc = devm_kzalloc(kdev->dev, channels * sizeof(*range->acc),
+ GFP_KERNEL);
+ if (!range->acc)
+ return -ENOMEM;
+
+ for (channel = 0; channel < channels; channel++) {
+ acc = range->acc + channel;
+ acc->channel = info->start_channel + channel;
+
+ /* allocate memory for the two lists */
+ list_mem = alloc_pages_exact(mem_size, GFP_KERNEL | GFP_DMA);
+ if (!list_mem)
+ return -ENOMEM;
+
+ list_dma = dma_map_single(kdev->dev, list_mem, mem_size,
+ DMA_BIDIRECTIONAL);
+ if (dma_mapping_error(kdev->dev, list_dma)) {
+ free_pages_exact(list_mem, mem_size);
+ return -ENOMEM;
+ }
+
+ memset(list_mem, 0, mem_size);
+ dma_sync_single_for_device(kdev->dev, list_dma, mem_size,
+ DMA_TO_DEVICE);
+ scnprintf(acc->name, sizeof(acc->name), "hwqueue-acc-%d",
+ acc->channel);
+ acc->list_cpu[0] = list_mem;
+ acc->list_cpu[1] = list_mem + list_size;
+ acc->list_dma[0] = list_dma;
+ acc->list_dma[1] = list_dma + list_size;
+ dev_dbg(kdev->dev, "%s: channel %d, phys %08x, virt %8p\n",
+ acc->name, acc->channel, list_dma, list_mem);
+ }
+
+ range->ops = &knav_acc_range_ops;
+ return 0;
+}
+EXPORT_SYMBOL_GPL(knav_init_acc_range);