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// SPDX-License-Identifier: GPL-2.0
/*
* Structures and helpers for managing GXP MicroController Unit.
*
* Copyright (C) 2022 Google LLC
*/
#include <linux/iommu.h>
#include <linux/sizes.h>
#include <gcip/gcip-mem-pool.h>
#include "gxp-config.h"
#include "gxp-dma.h"
#include "gxp-internal.h"
#include "gxp-mailbox.h"
#include "gxp-mcu-firmware.h"
#include "gxp-mcu.h"
#include "gxp-uci.h"
/* Allocates the MCU <-> cores shared buffer region. */
static int gxp_alloc_shared_buffer(struct gxp_dev *gxp, struct gxp_mcu *mcu)
{
const size_t size = GXP_SHARED_BUFFER_SIZE * GXP_NUM_CORES;
phys_addr_t paddr;
struct gxp_mapped_resource *res = &mcu->gxp->shared_buf;
size_t offset;
void *vaddr;
paddr = gcip_mem_pool_alloc(&mcu->remap_data_pool, size);
if (!paddr)
return -ENOMEM;
res->paddr = paddr;
res->size = size;
res->daddr = GXP_IOVA_SHARED_BUFFER;
/* clear shared buffer to make sure it's clean */
offset = gcip_mem_pool_offset(&mcu->remap_data_pool, paddr);
vaddr = offset + (mcu->fw.image_buf.vaddr + GXP_IREMAP_DATA_OFFSET);
memset(vaddr, 0, size);
ida_init(&gxp->shared_slice_idp);
gxp->num_shared_slices = GXP_SHARED_BUFFER_SIZE / GXP_SHARED_SLICE_SIZE;
gxp->shared_slice_size = GXP_SHARED_SLICE_SIZE;
return 0;
}
static void gxp_free_shared_buffer(struct gxp_mcu *mcu)
{
struct gxp_mapped_resource *res = &mcu->gxp->shared_buf;
ida_destroy(&mcu->gxp->shared_slice_idp);
gcip_mem_pool_free(&mcu->remap_data_pool, res->paddr, res->size);
}
/*
* Initializes memory pools, must be called after @mcu->fw has been initialized
* to have a valid image_buf.
*/
static int gxp_mcu_mem_pools_init(struct gxp_dev *gxp, struct gxp_mcu *mcu)
{
phys_addr_t iremap_paddr = mcu->fw.image_buf.paddr;
int ret;
ret = gcip_mem_pool_init(&mcu->remap_data_pool, gxp->dev,
iremap_paddr + GXP_IREMAP_DATA_OFFSET,
GXP_IREMAP_DATA_SIZE, SZ_4K);
if (ret)
return ret;
ret = gcip_mem_pool_init(&mcu->remap_secure_pool, gxp->dev,
iremap_paddr + GXP_IREMAP_SECURE_OFFSET,
GXP_IREMAP_SECURE_SIZE, SZ_4K);
if (ret) {
gcip_mem_pool_exit(&mcu->remap_data_pool);
return ret;
}
return 0;
}
static void gxp_mcu_unmap_resources(struct gxp_mcu *mcu)
{
struct gxp_dev *gxp = mcu->gxp;
struct gxp_iommu_domain *gdomain = gxp_iommu_get_domain_for_dev(gxp);
int i;
for (i = GXP_NUM_CORES; i < GXP_NUM_MAILBOXES; i++)
iommu_unmap(gdomain->domain, gxp->mbx[i].daddr, gxp->mbx[i].size);
}
static int gxp_mcu_map_resources(struct gxp_dev *gxp, struct gxp_mcu *mcu)
{
struct gxp_iommu_domain *gdomain = gxp_iommu_get_domain_for_dev(gxp);
int i, ret;
for (i = GXP_NUM_CORES; i < GXP_NUM_MAILBOXES; i++) {
gxp->mbx[i].daddr = GXP_MCU_NS_MAILBOX(i - GXP_NUM_CORES);
ret = iommu_map(gdomain->domain, gxp->mbx[i].daddr,
gxp->mbx[i].paddr +
MAILBOX_DEVICE_INTERFACE_OFFSET,
gxp->mbx[i].size, IOMMU_READ | IOMMU_WRITE);
if (ret)
goto err;
}
return ret;
err:
/*
* Attempt to unmap all resources.
* Any resource that hadn't been mapped yet will cause `iommu_unmap()`
* to return immediately, so its safe to try to unmap everything.
*/
gxp_mcu_unmap_resources(mcu);
return ret;
}
static void gxp_mcu_mem_pools_exit(struct gxp_mcu *mcu)
{
gcip_mem_pool_exit(&mcu->remap_secure_pool);
gcip_mem_pool_exit(&mcu->remap_data_pool);
}
int gxp_mcu_mem_alloc_data(struct gxp_mcu *mcu, struct gxp_mapped_resource *mem, size_t size)
{
size_t offset;
phys_addr_t paddr;
paddr = gcip_mem_pool_alloc(&mcu->remap_data_pool, size);
if (!paddr)
return -ENOMEM;
offset = gcip_mem_pool_offset(&mcu->remap_data_pool, paddr);
mem->size = size;
mem->paddr = paddr;
mem->vaddr = offset + (mcu->fw.image_buf.vaddr + GXP_IREMAP_DATA_OFFSET);
mem->daddr = offset + (mcu->fw.image_buf.daddr + GXP_IREMAP_DATA_OFFSET);
return 0;
}
void gxp_mcu_mem_free_data(struct gxp_mcu *mcu, struct gxp_mapped_resource *mem)
{
gcip_mem_pool_free(&mcu->remap_data_pool, mem->paddr, mem->size);
mem->size = 0;
mem->paddr = 0;
mem->vaddr = NULL;
mem->daddr = 0;
}
int gxp_mcu_init(struct gxp_dev *gxp, struct gxp_mcu *mcu)
{
int ret;
mcu->gxp = gxp;
ret = gxp_mcu_firmware_init(gxp, &mcu->fw);
if (ret)
return ret;
ret = gxp_mcu_mem_pools_init(gxp, mcu);
if (ret)
goto err_fw_exit;
ret = gxp_alloc_shared_buffer(gxp, mcu);
if (ret)
goto err_pools_exit;
ret = gxp_mcu_map_resources(gxp, mcu);
if (ret)
goto err_free_shared_buffer;
ret = gxp_uci_init(mcu);
if (ret)
goto err_mcu_unmap_resources;
ret = gxp_kci_init(mcu);
if (ret)
goto err_uci_exit;
/*
* MCU telemetry must be initialized after KCI since the telemetry IRQ
* is tied to KCI mailbox->interrupt_handlers.
*/
ret = gxp_mcu_telemetry_init(mcu);
if (ret)
goto err_uci_exit;
return 0;
err_uci_exit:
gxp_uci_exit(&mcu->uci);
err_mcu_unmap_resources:
gxp_mcu_unmap_resources(mcu);
err_free_shared_buffer:
gxp_free_shared_buffer(mcu);
err_pools_exit:
gxp_mcu_mem_pools_exit(mcu);
err_fw_exit:
gxp_mcu_firmware_exit(&mcu->fw);
return ret;
}
void gxp_mcu_exit(struct gxp_mcu *mcu)
{
gxp_mcu_telemetry_exit(mcu);
gxp_kci_exit(&mcu->kci);
gxp_uci_exit(&mcu->uci);
gxp_mcu_unmap_resources(mcu);
gxp_free_shared_buffer(mcu);
gxp_mcu_mem_pools_exit(mcu);
gxp_mcu_firmware_exit(&mcu->fw);
}
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