![Alex Elder](/assets/img/avatar_default.png)
This patch incorporates three source files (and their headers). They're grouped into one patch mainly for the purpose of making the number and size of patches in this series somewhat reasonable. - "ipa_clock.c" and "ipa_clock.h" implement clocking for the IPA device. The IPA has a single core clock managed by the common clock framework. In addition, the IPA has three buses whose bandwidth is managed by the Linux interconnect framework. At this time the core clock and all three buses are either on or off; we don't yet do any more fine-grained management than that. The core clock and interconnects are enabled and disabled as a unit, using a unified clock-like abstraction, ipa_clock_get()/ipa_clock_put(). - "ipa_interrupt.c" and "ipa_interrupt.h" implement IPA interrupts. There are two hardware IRQs used by the IPA driver (the other is the GSI interrupt, described in a separate patch). Several types of interrupt are handled by the IPA IRQ handler; these are not part of data/fast path. - The IPA has a region of local memory that is accessible by the AP (and modem). Within that region are areas with certain defined purposes. "ipa_mem.c" and "ipa_mem.h" define those regions, and implement their initialization. Signed-off-by: Alex Elder <elder@linaro.org> Signed-off-by: David S. Miller <davem@davemloft.net>
315 lines
8.4 KiB
C
315 lines
8.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2012-2018, The Linux Foundation. All rights reserved.
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* Copyright (C) 2019-2020 Linaro Ltd.
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*/
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#include <linux/types.h>
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#include <linux/bitfield.h>
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#include <linux/bug.h>
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#include <linux/dma-mapping.h>
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#include <linux/io.h>
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#include "ipa.h"
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#include "ipa_reg.h"
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#include "ipa_cmd.h"
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#include "ipa_mem.h"
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#include "ipa_data.h"
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#include "ipa_table.h"
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#include "gsi_trans.h"
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/* "Canary" value placed between memory regions to detect overflow */
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#define IPA_MEM_CANARY_VAL cpu_to_le32(0xdeadbeef)
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/* Add an immediate command to a transaction that zeroes a memory region */
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static void
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ipa_mem_zero_region_add(struct gsi_trans *trans, const struct ipa_mem *mem)
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{
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struct ipa *ipa = container_of(trans->gsi, struct ipa, gsi);
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dma_addr_t addr = ipa->zero_addr;
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if (!mem->size)
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return;
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ipa_cmd_dma_shared_mem_add(trans, mem->offset, mem->size, addr, true);
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}
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/**
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* ipa_mem_setup() - Set up IPA AP and modem shared memory areas
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*
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* Set up the shared memory regions in IPA local memory. This involves
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* zero-filling memory regions, and in the case of header memory, telling
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* the IPA where it's located.
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*
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* This function performs the initial setup of this memory. If the modem
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* crashes, its regions are re-zeroed in ipa_mem_zero_modem().
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*
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* The AP informs the modem where its portions of memory are located
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* in a QMI exchange that occurs at modem startup.
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*
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* @Return: 0 if successful, or a negative error code
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*/
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int ipa_mem_setup(struct ipa *ipa)
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{
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dma_addr_t addr = ipa->zero_addr;
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struct gsi_trans *trans;
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u32 offset;
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u16 size;
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/* Get a transaction to define the header memory region and to zero
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* the processing context and modem memory regions.
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*/
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trans = ipa_cmd_trans_alloc(ipa, 4);
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if (!trans) {
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dev_err(&ipa->pdev->dev, "no transaction for memory setup\n");
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return -EBUSY;
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}
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/* Initialize IPA-local header memory. The modem and AP header
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* regions are contiguous, and initialized together.
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*/
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offset = ipa->mem[IPA_MEM_MODEM_HEADER].offset;
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size = ipa->mem[IPA_MEM_MODEM_HEADER].size;
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size += ipa->mem[IPA_MEM_AP_HEADER].size;
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ipa_cmd_hdr_init_local_add(trans, offset, size, addr);
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ipa_mem_zero_region_add(trans, &ipa->mem[IPA_MEM_MODEM_PROC_CTX]);
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ipa_mem_zero_region_add(trans, &ipa->mem[IPA_MEM_AP_PROC_CTX]);
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ipa_mem_zero_region_add(trans, &ipa->mem[IPA_MEM_MODEM]);
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gsi_trans_commit_wait(trans);
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/* Tell the hardware where the processing context area is located */
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iowrite32(ipa->mem_offset + offset,
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ipa->reg_virt + IPA_REG_LOCAL_PKT_PROC_CNTXT_BASE_OFFSET);
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return 0;
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}
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void ipa_mem_teardown(struct ipa *ipa)
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{
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/* Nothing to do */
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}
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#ifdef IPA_VALIDATE
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static bool ipa_mem_valid(struct ipa *ipa, enum ipa_mem_id mem_id)
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{
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const struct ipa_mem *mem = &ipa->mem[mem_id];
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struct device *dev = &ipa->pdev->dev;
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u16 size_multiple;
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/* Other than modem memory, sizes must be a multiple of 8 */
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size_multiple = mem_id == IPA_MEM_MODEM ? 4 : 8;
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if (mem->size % size_multiple)
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dev_err(dev, "region %u size not a multiple of %u bytes\n",
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mem_id, size_multiple);
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else if (mem->offset % 8)
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dev_err(dev, "region %u offset not 8-byte aligned\n", mem_id);
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else if (mem->offset < mem->canary_count * sizeof(__le32))
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dev_err(dev, "region %u offset too small for %hu canaries\n",
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mem_id, mem->canary_count);
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else if (mem->offset + mem->size > ipa->mem_size)
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dev_err(dev, "region %u ends beyond memory limit (0x%08x)\n",
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mem_id, ipa->mem_size);
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else
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return true;
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return false;
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}
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#else /* !IPA_VALIDATE */
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static bool ipa_mem_valid(struct ipa *ipa, enum ipa_mem_id mem_id)
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{
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return true;
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}
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#endif /*! IPA_VALIDATE */
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/**
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* ipa_mem_config() - Configure IPA shared memory
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*
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* @Return: 0 if successful, or a negative error code
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*/
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int ipa_mem_config(struct ipa *ipa)
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{
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struct device *dev = &ipa->pdev->dev;
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enum ipa_mem_id mem_id;
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dma_addr_t addr;
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u32 mem_size;
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void *virt;
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u32 val;
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/* Check the advertised location and size of the shared memory area */
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val = ioread32(ipa->reg_virt + IPA_REG_SHARED_MEM_SIZE_OFFSET);
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/* The fields in the register are in 8 byte units */
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ipa->mem_offset = 8 * u32_get_bits(val, SHARED_MEM_BADDR_FMASK);
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/* Make sure the end is within the region's mapped space */
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mem_size = 8 * u32_get_bits(val, SHARED_MEM_SIZE_FMASK);
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/* If the sizes don't match, issue a warning */
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if (ipa->mem_offset + mem_size > ipa->mem_size) {
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dev_warn(dev, "ignoring larger reported memory size: 0x%08x\n",
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mem_size);
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} else if (ipa->mem_offset + mem_size < ipa->mem_size) {
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dev_warn(dev, "limiting IPA memory size to 0x%08x\n",
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mem_size);
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ipa->mem_size = mem_size;
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}
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/* Prealloc DMA memory for zeroing regions */
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virt = dma_alloc_coherent(dev, IPA_MEM_MAX, &addr, GFP_KERNEL);
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if (!virt)
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return -ENOMEM;
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ipa->zero_addr = addr;
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ipa->zero_virt = virt;
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ipa->zero_size = IPA_MEM_MAX;
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/* Verify each defined memory region is valid, and if indicated
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* for the region, write "canary" values in the space prior to
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* the region's base address.
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*/
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for (mem_id = 0; mem_id < IPA_MEM_COUNT; mem_id++) {
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const struct ipa_mem *mem = &ipa->mem[mem_id];
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u16 canary_count;
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__le32 *canary;
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/* Validate all regions (even undefined ones) */
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if (!ipa_mem_valid(ipa, mem_id))
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goto err_dma_free;
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/* Skip over undefined regions */
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if (!mem->offset && !mem->size)
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continue;
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canary_count = mem->canary_count;
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if (!canary_count)
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continue;
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/* Write canary values in the space before the region */
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canary = ipa->mem_virt + ipa->mem_offset + mem->offset;
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do
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*--canary = IPA_MEM_CANARY_VAL;
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while (--canary_count);
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}
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/* Make sure filter and route table memory regions are valid */
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if (!ipa_table_valid(ipa))
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goto err_dma_free;
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/* Validate memory-related properties relevant to immediate commands */
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if (!ipa_cmd_data_valid(ipa))
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goto err_dma_free;
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/* Verify the microcontroller ring alignment (0 is OK too) */
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if (ipa->mem[IPA_MEM_UC_EVENT_RING].offset % 1024) {
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dev_err(dev, "microcontroller ring not 1024-byte aligned\n");
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goto err_dma_free;
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}
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return 0;
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err_dma_free:
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dma_free_coherent(dev, IPA_MEM_MAX, ipa->zero_virt, ipa->zero_addr);
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return -EINVAL;
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}
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/* Inverse of ipa_mem_config() */
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void ipa_mem_deconfig(struct ipa *ipa)
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{
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struct device *dev = &ipa->pdev->dev;
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dma_free_coherent(dev, ipa->zero_size, ipa->zero_virt, ipa->zero_addr);
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ipa->zero_size = 0;
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ipa->zero_virt = NULL;
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ipa->zero_addr = 0;
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}
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/**
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* ipa_mem_zero_modem() - Zero IPA-local memory regions owned by the modem
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*
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* Zero regions of IPA-local memory used by the modem. These are configured
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* (and initially zeroed) by ipa_mem_setup(), but if the modem crashes and
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* restarts via SSR we need to re-initialize them. A QMI message tells the
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* modem where to find regions of IPA local memory it needs to know about
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* (these included).
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*/
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int ipa_mem_zero_modem(struct ipa *ipa)
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{
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struct gsi_trans *trans;
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/* Get a transaction to zero the modem memory, modem header,
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* and modem processing context regions.
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*/
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trans = ipa_cmd_trans_alloc(ipa, 3);
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if (!trans) {
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dev_err(&ipa->pdev->dev,
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"no transaction to zero modem memory\n");
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return -EBUSY;
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}
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ipa_mem_zero_region_add(trans, &ipa->mem[IPA_MEM_MODEM_HEADER]);
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ipa_mem_zero_region_add(trans, &ipa->mem[IPA_MEM_MODEM_PROC_CTX]);
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ipa_mem_zero_region_add(trans, &ipa->mem[IPA_MEM_MODEM]);
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gsi_trans_commit_wait(trans);
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return 0;
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}
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/* Perform memory region-related initialization */
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int ipa_mem_init(struct ipa *ipa, u32 count, const struct ipa_mem *mem)
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{
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struct device *dev = &ipa->pdev->dev;
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struct resource *res;
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int ret;
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if (count > IPA_MEM_COUNT) {
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dev_err(dev, "to many memory regions (%u > %u)\n",
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count, IPA_MEM_COUNT);
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return -EINVAL;
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}
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ret = dma_set_mask_and_coherent(&ipa->pdev->dev, DMA_BIT_MASK(64));
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if (ret) {
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dev_err(dev, "error %d setting DMA mask\n", ret);
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return ret;
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}
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res = platform_get_resource_byname(ipa->pdev, IORESOURCE_MEM,
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"ipa-shared");
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if (!res) {
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dev_err(dev,
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"DT error getting \"ipa-shared\" memory property\n");
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return -ENODEV;
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}
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ipa->mem_virt = memremap(res->start, resource_size(res), MEMREMAP_WC);
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if (!ipa->mem_virt) {
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dev_err(dev, "unable to remap \"ipa-shared\" memory\n");
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return -ENOMEM;
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}
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ipa->mem_addr = res->start;
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ipa->mem_size = resource_size(res);
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/* The ipa->mem[] array is indexed by enum ipa_mem_id values */
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ipa->mem = mem;
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return 0;
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}
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/* Inverse of ipa_mem_init() */
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void ipa_mem_exit(struct ipa *ipa)
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{
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memunmap(ipa->mem_virt);
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}
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