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233 lines
6.6 KiB
233 lines
6.6 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* DMA translation between STA2x11 AMBA memory mapping and the x86 memory mapping |
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* |
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* ST Microelectronics ConneXt (STA2X11/STA2X10) |
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* |
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* Copyright (c) 2010-2011 Wind River Systems, Inc. |
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*/ |
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#include <linux/pci.h> |
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#include <linux/pci_ids.h> |
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#include <linux/export.h> |
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#include <linux/list.h> |
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#include <linux/dma-map-ops.h> |
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#include <linux/swiotlb.h> |
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#include <asm/iommu.h> |
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#define STA2X11_SWIOTLB_SIZE (4*1024*1024) |
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/* |
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* We build a list of bus numbers that are under the ConneXt. The |
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* main bridge hosts 4 busses, which are the 4 endpoints, in order. |
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*/ |
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#define STA2X11_NR_EP 4 /* 0..3 included */ |
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#define STA2X11_NR_FUNCS 8 /* 0..7 included */ |
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#define STA2X11_AMBA_SIZE (512 << 20) |
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struct sta2x11_ahb_regs { /* saved during suspend */ |
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u32 base, pexlbase, pexhbase, crw; |
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}; |
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struct sta2x11_mapping { |
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int is_suspended; |
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struct sta2x11_ahb_regs regs[STA2X11_NR_FUNCS]; |
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}; |
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struct sta2x11_instance { |
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struct list_head list; |
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int bus0; |
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struct sta2x11_mapping map[STA2X11_NR_EP]; |
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}; |
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static LIST_HEAD(sta2x11_instance_list); |
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/* At probe time, record new instances of this bridge (likely one only) */ |
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static void sta2x11_new_instance(struct pci_dev *pdev) |
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{ |
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struct sta2x11_instance *instance; |
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instance = kzalloc(sizeof(*instance), GFP_ATOMIC); |
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if (!instance) |
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return; |
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/* This has a subordinate bridge, with 4 more-subordinate ones */ |
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instance->bus0 = pdev->subordinate->number + 1; |
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if (list_empty(&sta2x11_instance_list)) { |
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int size = STA2X11_SWIOTLB_SIZE; |
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/* First instance: register your own swiotlb area */ |
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dev_info(&pdev->dev, "Using SWIOTLB (size %i)\n", size); |
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if (swiotlb_late_init_with_default_size(size)) |
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dev_emerg(&pdev->dev, "init swiotlb failed\n"); |
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} |
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list_add(&instance->list, &sta2x11_instance_list); |
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} |
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DECLARE_PCI_FIXUP_ENABLE(PCI_VENDOR_ID_STMICRO, 0xcc17, sta2x11_new_instance); |
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/* |
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* Utility functions used in this file from below |
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*/ |
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static struct sta2x11_instance *sta2x11_pdev_to_instance(struct pci_dev *pdev) |
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{ |
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struct sta2x11_instance *instance; |
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int ep; |
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list_for_each_entry(instance, &sta2x11_instance_list, list) { |
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ep = pdev->bus->number - instance->bus0; |
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if (ep >= 0 && ep < STA2X11_NR_EP) |
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return instance; |
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} |
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return NULL; |
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} |
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static int sta2x11_pdev_to_ep(struct pci_dev *pdev) |
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{ |
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struct sta2x11_instance *instance; |
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instance = sta2x11_pdev_to_instance(pdev); |
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if (!instance) |
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return -1; |
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return pdev->bus->number - instance->bus0; |
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} |
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/* This is exported, as some devices need to access the MFD registers */ |
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struct sta2x11_instance *sta2x11_get_instance(struct pci_dev *pdev) |
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{ |
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return sta2x11_pdev_to_instance(pdev); |
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} |
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EXPORT_SYMBOL(sta2x11_get_instance); |
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/* At setup time, we use our own ops if the device is a ConneXt one */ |
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static void sta2x11_setup_pdev(struct pci_dev *pdev) |
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{ |
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struct sta2x11_instance *instance = sta2x11_pdev_to_instance(pdev); |
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if (!instance) /* either a sta2x11 bridge or another ST device */ |
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return; |
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/* We must enable all devices as master, for audio DMA to work */ |
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pci_set_master(pdev); |
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} |
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DECLARE_PCI_FIXUP_ENABLE(PCI_VENDOR_ID_STMICRO, PCI_ANY_ID, sta2x11_setup_pdev); |
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/* |
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* At boot we must set up the mappings for the pcie-to-amba bridge. |
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* It involves device access, and the same happens at suspend/resume time |
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*/ |
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#define AHB_MAPB 0xCA4 |
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#define AHB_CRW(i) (AHB_MAPB + 0 + (i) * 0x10) |
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#define AHB_CRW_SZMASK 0xfffffc00UL |
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#define AHB_CRW_ENABLE (1 << 0) |
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#define AHB_CRW_WTYPE_MEM (2 << 1) |
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#define AHB_CRW_ROE (1UL << 3) /* Relax Order Ena */ |
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#define AHB_CRW_NSE (1UL << 4) /* No Snoop Enable */ |
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#define AHB_BASE(i) (AHB_MAPB + 4 + (i) * 0x10) |
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#define AHB_PEXLBASE(i) (AHB_MAPB + 8 + (i) * 0x10) |
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#define AHB_PEXHBASE(i) (AHB_MAPB + 12 + (i) * 0x10) |
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/* At probe time, enable mapping for each endpoint, using the pdev */ |
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static void sta2x11_map_ep(struct pci_dev *pdev) |
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{ |
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struct sta2x11_instance *instance = sta2x11_pdev_to_instance(pdev); |
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struct device *dev = &pdev->dev; |
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u32 amba_base, max_amba_addr; |
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int i, ret; |
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if (!instance) |
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return; |
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pci_read_config_dword(pdev, AHB_BASE(0), &amba_base); |
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max_amba_addr = amba_base + STA2X11_AMBA_SIZE - 1; |
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ret = dma_direct_set_offset(dev, 0, amba_base, STA2X11_AMBA_SIZE); |
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if (ret) |
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dev_err(dev, "sta2x11: could not set DMA offset\n"); |
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dev->bus_dma_limit = max_amba_addr; |
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pci_set_consistent_dma_mask(pdev, max_amba_addr); |
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pci_set_dma_mask(pdev, max_amba_addr); |
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/* Configure AHB mapping */ |
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pci_write_config_dword(pdev, AHB_PEXLBASE(0), 0); |
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pci_write_config_dword(pdev, AHB_PEXHBASE(0), 0); |
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pci_write_config_dword(pdev, AHB_CRW(0), STA2X11_AMBA_SIZE | |
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AHB_CRW_WTYPE_MEM | AHB_CRW_ENABLE); |
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/* Disable all the other windows */ |
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for (i = 1; i < STA2X11_NR_FUNCS; i++) |
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pci_write_config_dword(pdev, AHB_CRW(i), 0); |
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dev_info(&pdev->dev, |
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"sta2x11: Map EP %i: AMBA address %#8x-%#8x\n", |
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sta2x11_pdev_to_ep(pdev), amba_base, max_amba_addr); |
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} |
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DECLARE_PCI_FIXUP_ENABLE(PCI_VENDOR_ID_STMICRO, PCI_ANY_ID, sta2x11_map_ep); |
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#ifdef CONFIG_PM /* Some register values must be saved and restored */ |
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static struct sta2x11_mapping *sta2x11_pdev_to_mapping(struct pci_dev *pdev) |
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{ |
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struct sta2x11_instance *instance; |
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int ep; |
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instance = sta2x11_pdev_to_instance(pdev); |
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if (!instance) |
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return NULL; |
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ep = sta2x11_pdev_to_ep(pdev); |
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return instance->map + ep; |
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} |
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static void suspend_mapping(struct pci_dev *pdev) |
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{ |
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struct sta2x11_mapping *map = sta2x11_pdev_to_mapping(pdev); |
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int i; |
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if (!map) |
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return; |
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if (map->is_suspended) |
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return; |
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map->is_suspended = 1; |
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/* Save all window configs */ |
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for (i = 0; i < STA2X11_NR_FUNCS; i++) { |
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struct sta2x11_ahb_regs *regs = map->regs + i; |
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pci_read_config_dword(pdev, AHB_BASE(i), ®s->base); |
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pci_read_config_dword(pdev, AHB_PEXLBASE(i), ®s->pexlbase); |
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pci_read_config_dword(pdev, AHB_PEXHBASE(i), ®s->pexhbase); |
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pci_read_config_dword(pdev, AHB_CRW(i), ®s->crw); |
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} |
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} |
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DECLARE_PCI_FIXUP_SUSPEND(PCI_VENDOR_ID_STMICRO, PCI_ANY_ID, suspend_mapping); |
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static void resume_mapping(struct pci_dev *pdev) |
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{ |
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struct sta2x11_mapping *map = sta2x11_pdev_to_mapping(pdev); |
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int i; |
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if (!map) |
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return; |
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if (!map->is_suspended) |
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goto out; |
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map->is_suspended = 0; |
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/* Restore all window configs */ |
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for (i = 0; i < STA2X11_NR_FUNCS; i++) { |
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struct sta2x11_ahb_regs *regs = map->regs + i; |
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pci_write_config_dword(pdev, AHB_BASE(i), regs->base); |
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pci_write_config_dword(pdev, AHB_PEXLBASE(i), regs->pexlbase); |
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pci_write_config_dword(pdev, AHB_PEXHBASE(i), regs->pexhbase); |
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pci_write_config_dword(pdev, AHB_CRW(i), regs->crw); |
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} |
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out: |
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pci_set_master(pdev); /* Like at boot, enable master on all devices */ |
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} |
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DECLARE_PCI_FIXUP_RESUME(PCI_VENDOR_ID_STMICRO, PCI_ANY_ID, resume_mapping); |
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#endif /* CONFIG_PM */
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