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// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2012-2018, The Linux Foundation. All rights reserved.
* Copyright (C) 2019-2020 Linaro Ltd.
*/
#include <linux/types.h>
#include <linux/bitfield.h>
#include <linux/bug.h>
#include <linux/dma-mapping.h>
#include <linux/io.h>
#include "ipa.h"
#include "ipa_reg.h"
#include "ipa_data.h"
#include "ipa_cmd.h"
#include "ipa_mem.h"
#include "ipa_data.h"
#include "ipa_table.h"
#include "gsi_trans.h"
/* "Canary" value placed between memory regions to detect overflow */
#define IPA_MEM_CANARY_VAL cpu_to_le32(0xdeadbeef)
/* Add an immediate command to a transaction that zeroes a memory region */
static void
ipa_mem_zero_region_add(struct gsi_trans *trans, const struct ipa_mem *mem)
{
struct ipa *ipa = container_of(trans->gsi, struct ipa, gsi);
dma_addr_t addr = ipa->zero_addr;
if (!mem->size)
return;
ipa_cmd_dma_shared_mem_add(trans, mem->offset, mem->size, addr, true);
}
/**
* ipa_mem_setup() - Set up IPA AP and modem shared memory areas
*
* Set up the shared memory regions in IPA local memory. This involves
* zero-filling memory regions, and in the case of header memory, telling
* the IPA where it's located.
*
* This function performs the initial setup of this memory. If the modem
* crashes, its regions are re-zeroed in ipa_mem_zero_modem().
*
* The AP informs the modem where its portions of memory are located
* in a QMI exchange that occurs at modem startup.
*
* @Return: 0 if successful, or a negative error code
*/
int ipa_mem_setup(struct ipa *ipa)
{
dma_addr_t addr = ipa->zero_addr;
struct gsi_trans *trans;
u32 offset;
u16 size;
/* Get a transaction to define the header memory region and to zero
* the processing context and modem memory regions.
*/
trans = ipa_cmd_trans_alloc(ipa, 4);
if (!trans) {
dev_err(&ipa->pdev->dev, "no transaction for memory setup\n");
return -EBUSY;
}
/* Initialize IPA-local header memory. The modem and AP header
* regions are contiguous, and initialized together.
*/
offset = ipa->mem[IPA_MEM_MODEM_HEADER].offset;
size = ipa->mem[IPA_MEM_MODEM_HEADER].size;
size += ipa->mem[IPA_MEM_AP_HEADER].size;
ipa_cmd_hdr_init_local_add(trans, offset, size, addr);
ipa_mem_zero_region_add(trans, &ipa->mem[IPA_MEM_MODEM_PROC_CTX]);
ipa_mem_zero_region_add(trans, &ipa->mem[IPA_MEM_AP_PROC_CTX]);
ipa_mem_zero_region_add(trans, &ipa->mem[IPA_MEM_MODEM]);
gsi_trans_commit_wait(trans);
/* Tell the hardware where the processing context area is located */
iowrite32(ipa->mem_offset + offset,
ipa->reg_virt + IPA_REG_LOCAL_PKT_PROC_CNTXT_BASE_OFFSET);
return 0;
}
void ipa_mem_teardown(struct ipa *ipa)
{
/* Nothing to do */
}
#ifdef IPA_VALIDATE
static bool ipa_mem_valid(struct ipa *ipa, enum ipa_mem_id mem_id)
{
const struct ipa_mem *mem = &ipa->mem[mem_id];
struct device *dev = &ipa->pdev->dev;
u16 size_multiple;
/* Other than modem memory, sizes must be a multiple of 8 */
size_multiple = mem_id == IPA_MEM_MODEM ? 4 : 8;
if (mem->size % size_multiple)
dev_err(dev, "region %u size not a multiple of %u bytes\n",
mem_id, size_multiple);
else if (mem->offset % 8)
dev_err(dev, "region %u offset not 8-byte aligned\n", mem_id);
else if (mem->offset < mem->canary_count * sizeof(__le32))
dev_err(dev, "region %u offset too small for %hu canaries\n",
mem_id, mem->canary_count);
else if (mem->offset + mem->size > ipa->mem_size)
dev_err(dev, "region %u ends beyond memory limit (0x%08x)\n",
mem_id, ipa->mem_size);
else
return true;
return false;
}
#else /* !IPA_VALIDATE */
static bool ipa_mem_valid(struct ipa *ipa, enum ipa_mem_id mem_id)
{
return true;
}
#endif /*! IPA_VALIDATE */
/**
* ipa_mem_config() - Configure IPA shared memory
*
* @Return: 0 if successful, or a negative error code
*/
int ipa_mem_config(struct ipa *ipa)
{
struct device *dev = &ipa->pdev->dev;
enum ipa_mem_id mem_id;
dma_addr_t addr;
u32 mem_size;
void *virt;
u32 val;
/* Check the advertised location and size of the shared memory area */
val = ioread32(ipa->reg_virt + IPA_REG_SHARED_MEM_SIZE_OFFSET);
/* The fields in the register are in 8 byte units */
ipa->mem_offset = 8 * u32_get_bits(val, SHARED_MEM_BADDR_FMASK);
/* Make sure the end is within the region's mapped space */
mem_size = 8 * u32_get_bits(val, SHARED_MEM_SIZE_FMASK);
/* If the sizes don't match, issue a warning */
if (ipa->mem_offset + mem_size > ipa->mem_size) {
dev_warn(dev, "ignoring larger reported memory size: 0x%08x\n",
mem_size);
} else if (ipa->mem_offset + mem_size < ipa->mem_size) {
dev_warn(dev, "limiting IPA memory size to 0x%08x\n",
mem_size);
ipa->mem_size = mem_size;
}
/* Prealloc DMA memory for zeroing regions */
virt = dma_alloc_coherent(dev, IPA_MEM_MAX, &addr, GFP_KERNEL);
if (!virt)
return -ENOMEM;
ipa->zero_addr = addr;
ipa->zero_virt = virt;
ipa->zero_size = IPA_MEM_MAX;
/* Verify each defined memory region is valid, and if indicated
* for the region, write "canary" values in the space prior to
* the region's base address.
*/
for (mem_id = 0; mem_id < IPA_MEM_COUNT; mem_id++) {
const struct ipa_mem *mem = &ipa->mem[mem_id];
u16 canary_count;
__le32 *canary;
/* Validate all regions (even undefined ones) */
if (!ipa_mem_valid(ipa, mem_id))
goto err_dma_free;
/* Skip over undefined regions */
if (!mem->offset && !mem->size)
continue;
canary_count = mem->canary_count;
if (!canary_count)
continue;
/* Write canary values in the space before the region */
canary = ipa->mem_virt + ipa->mem_offset + mem->offset;
do
*--canary = IPA_MEM_CANARY_VAL;
while (--canary_count);
}
/* Make sure filter and route table memory regions are valid */
if (!ipa_table_valid(ipa))
goto err_dma_free;
/* Validate memory-related properties relevant to immediate commands */
if (!ipa_cmd_data_valid(ipa))
goto err_dma_free;
/* Verify the microcontroller ring alignment (0 is OK too) */
if (ipa->mem[IPA_MEM_UC_EVENT_RING].offset % 1024) {
dev_err(dev, "microcontroller ring not 1024-byte aligned\n");
goto err_dma_free;
}
return 0;
err_dma_free:
dma_free_coherent(dev, IPA_MEM_MAX, ipa->zero_virt, ipa->zero_addr);
return -EINVAL;
}
/* Inverse of ipa_mem_config() */
void ipa_mem_deconfig(struct ipa *ipa)
{
struct device *dev = &ipa->pdev->dev;
dma_free_coherent(dev, ipa->zero_size, ipa->zero_virt, ipa->zero_addr);
ipa->zero_size = 0;
ipa->zero_virt = NULL;
ipa->zero_addr = 0;
}
/**
* ipa_mem_zero_modem() - Zero IPA-local memory regions owned by the modem
*
* Zero regions of IPA-local memory used by the modem. These are configured
* (and initially zeroed) by ipa_mem_setup(), but if the modem crashes and
* restarts via SSR we need to re-initialize them. A QMI message tells the
* modem where to find regions of IPA local memory it needs to know about
* (these included).
*/
int ipa_mem_zero_modem(struct ipa *ipa)
{
struct gsi_trans *trans;
/* Get a transaction to zero the modem memory, modem header,
* and modem processing context regions.
*/
trans = ipa_cmd_trans_alloc(ipa, 3);
if (!trans) {
dev_err(&ipa->pdev->dev,
"no transaction to zero modem memory\n");
return -EBUSY;
}
ipa_mem_zero_region_add(trans, &ipa->mem[IPA_MEM_MODEM_HEADER]);
ipa_mem_zero_region_add(trans, &ipa->mem[IPA_MEM_MODEM_PROC_CTX]);
ipa_mem_zero_region_add(trans, &ipa->mem[IPA_MEM_MODEM]);
gsi_trans_commit_wait(trans);
return 0;
}
/* Perform memory region-related initialization */
int ipa_mem_init(struct ipa *ipa, const struct ipa_mem_data *mem_data)
{
struct device *dev = &ipa->pdev->dev;
struct resource *res;
int ret;
if (mem_data->local_count > IPA_MEM_COUNT) {
dev_err(dev, "to many memory regions (%u > %u)\n",
mem_data->local_count, IPA_MEM_COUNT);
return -EINVAL;
}
ret = dma_set_mask_and_coherent(&ipa->pdev->dev, DMA_BIT_MASK(64));
if (ret) {
dev_err(dev, "error %d setting DMA mask\n", ret);
return ret;
}
res = platform_get_resource_byname(ipa->pdev, IORESOURCE_MEM,
"ipa-shared");
if (!res) {
dev_err(dev,
"DT error getting \"ipa-shared\" memory property\n");
return -ENODEV;
}
ipa->mem_virt = memremap(res->start, resource_size(res), MEMREMAP_WC);
if (!ipa->mem_virt) {
dev_err(dev, "unable to remap \"ipa-shared\" memory\n");
return -ENOMEM;
}
ipa->mem_addr = res->start;
ipa->mem_size = resource_size(res);
/* The ipa->mem[] array is indexed by enum ipa_mem_id values */
ipa->mem = mem_data->local;
return 0;
}
/* Inverse of ipa_mem_init() */
void ipa_mem_exit(struct ipa *ipa)
{
memunmap(ipa->mem_virt);
}
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