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linux/arch/x86/pci/sta2x11-fixup.c
Thomas Gleixner 4505153954 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 333 
Based on 1 normalized pattern(s):

  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 you should have received a copy of the gnu general
  public license along with this program if not write to the free
  software foundation inc 59 temple place suite 330 boston ma 02111
  1307 usa

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-only

has been chosen to replace the boilerplate/reference in 136 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Alexios Zavras <alexios.zavras@intel.com>
Reviewed-by: Allison Randal <allison@lohutok.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190530000436.384967451@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-06-05 17:37:06 +02:00

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8.4 KiB
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// SPDX-License-Identifier: GPL-2.0-only
/*
* arch/x86/pci/sta2x11-fixup.c
* glue code for lib/swiotlb.c and DMA translation between STA2x11
* AMBA memory mapping and the X86 memory mapping
*
* ST Microelectronics ConneXt (STA2X11/STA2X10)
*
* Copyright (c) 2010-2011 Wind River Systems, Inc.
*/
#include <linux/pci.h>
#include <linux/pci_ids.h>
#include <linux/export.h>
#include <linux/list.h>
#include <linux/dma-direct.h>
#include <asm/iommu.h>
#define STA2X11_SWIOTLB_SIZE (4*1024*1024)
extern int swiotlb_late_init_with_default_size(size_t default_size);
/*
* We build a list of bus numbers that are under the ConneXt. The
* main bridge hosts 4 busses, which are the 4 endpoints, in order.
*/
#define STA2X11_NR_EP 4 /* 0..3 included */
#define STA2X11_NR_FUNCS 8 /* 0..7 included */
#define STA2X11_AMBA_SIZE (512 << 20)
struct sta2x11_ahb_regs { /* saved during suspend */
u32 base, pexlbase, pexhbase, crw;
};
struct sta2x11_mapping {
u32 amba_base;
int is_suspended;
struct sta2x11_ahb_regs regs[STA2X11_NR_FUNCS];
};
struct sta2x11_instance {
struct list_head list;
int bus0;
struct sta2x11_mapping map[STA2X11_NR_EP];
};
static LIST_HEAD(sta2x11_instance_list);
/* At probe time, record new instances of this bridge (likely one only) */
static void sta2x11_new_instance(struct pci_dev *pdev)
{
struct sta2x11_instance *instance;
instance = kzalloc(sizeof(*instance), GFP_ATOMIC);
if (!instance)
return;
/* This has a subordinate bridge, with 4 more-subordinate ones */
instance->bus0 = pdev->subordinate->number + 1;
if (list_empty(&sta2x11_instance_list)) {
int size = STA2X11_SWIOTLB_SIZE;
/* First instance: register your own swiotlb area */
dev_info(&pdev->dev, "Using SWIOTLB (size %i)\n", size);
if (swiotlb_late_init_with_default_size(size))
dev_emerg(&pdev->dev, "init swiotlb failed\n");
}
list_add(&instance->list, &sta2x11_instance_list);
}
DECLARE_PCI_FIXUP_ENABLE(PCI_VENDOR_ID_STMICRO, 0xcc17, sta2x11_new_instance);
/*
* Utility functions used in this file from below
*/
static struct sta2x11_instance *sta2x11_pdev_to_instance(struct pci_dev *pdev)
{
struct sta2x11_instance *instance;
int ep;
list_for_each_entry(instance, &sta2x11_instance_list, list) {
ep = pdev->bus->number - instance->bus0;
if (ep >= 0 && ep < STA2X11_NR_EP)
return instance;
}
return NULL;
}
static int sta2x11_pdev_to_ep(struct pci_dev *pdev)
{
struct sta2x11_instance *instance;
instance = sta2x11_pdev_to_instance(pdev);
if (!instance)
return -1;
return pdev->bus->number - instance->bus0;
}
static struct sta2x11_mapping *sta2x11_pdev_to_mapping(struct pci_dev *pdev)
{
struct sta2x11_instance *instance;
int ep;
instance = sta2x11_pdev_to_instance(pdev);
if (!instance)
return NULL;
ep = sta2x11_pdev_to_ep(pdev);
return instance->map + ep;
}
/* This is exported, as some devices need to access the MFD registers */
struct sta2x11_instance *sta2x11_get_instance(struct pci_dev *pdev)
{
return sta2x11_pdev_to_instance(pdev);
}
EXPORT_SYMBOL(sta2x11_get_instance);
/**
* p2a - Translate physical address to STA2x11 AMBA address,
* used for DMA transfers to STA2x11
* @p: Physical address
* @pdev: PCI device (must be hosted within the connext)
*/
static dma_addr_t p2a(dma_addr_t p, struct pci_dev *pdev)
{
struct sta2x11_mapping *map;
dma_addr_t a;
map = sta2x11_pdev_to_mapping(pdev);
a = p + map->amba_base;
return a;
}
/**
* a2p - Translate STA2x11 AMBA address to physical address
* used for DMA transfers from STA2x11
* @a: STA2x11 AMBA address
* @pdev: PCI device (must be hosted within the connext)
*/
static dma_addr_t a2p(dma_addr_t a, struct pci_dev *pdev)
{
struct sta2x11_mapping *map;
dma_addr_t p;
map = sta2x11_pdev_to_mapping(pdev);
p = a - map->amba_base;
return p;
}
/* At setup time, we use our own ops if the device is a ConneXt one */
static void sta2x11_setup_pdev(struct pci_dev *pdev)
{
struct sta2x11_instance *instance = sta2x11_pdev_to_instance(pdev);
if (!instance) /* either a sta2x11 bridge or another ST device */
return;
pci_set_consistent_dma_mask(pdev, STA2X11_AMBA_SIZE - 1);
pci_set_dma_mask(pdev, STA2X11_AMBA_SIZE - 1);
pdev->dev.archdata.is_sta2x11 = true;
/* We must enable all devices as master, for audio DMA to work */
pci_set_master(pdev);
}
DECLARE_PCI_FIXUP_ENABLE(PCI_VENDOR_ID_STMICRO, PCI_ANY_ID, sta2x11_setup_pdev);
/*
* The following three functions are exported (used in swiotlb: FIXME)
*/
/**
* dma_capable - Check if device can manage DMA transfers (FIXME: kill it)
* @dev: device for a PCI device
* @addr: DMA address
* @size: DMA size
*/
bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
{
struct sta2x11_mapping *map;
if (!dev->archdata.is_sta2x11) {
if (!dev->dma_mask)
return false;
return addr + size - 1 <= *dev->dma_mask;
}
map = sta2x11_pdev_to_mapping(to_pci_dev(dev));
if (!map || (addr < map->amba_base))
return false;
if (addr + size >= map->amba_base + STA2X11_AMBA_SIZE) {
return false;
}
return true;
}
/**
* __phys_to_dma - Return the DMA AMBA address used for this STA2x11 device
* @dev: device for a PCI device
* @paddr: Physical address
*/
dma_addr_t __phys_to_dma(struct device *dev, phys_addr_t paddr)
{
if (!dev->archdata.is_sta2x11)
return paddr;
return p2a(paddr, to_pci_dev(dev));
}
/**
* dma_to_phys - Return the physical address used for this STA2x11 DMA address
* @dev: device for a PCI device
* @daddr: STA2x11 AMBA DMA address
*/
phys_addr_t __dma_to_phys(struct device *dev, dma_addr_t daddr)
{
if (!dev->archdata.is_sta2x11)
return daddr;
return a2p(daddr, to_pci_dev(dev));
}
/*
* At boot we must set up the mappings for the pcie-to-amba bridge.
* It involves device access, and the same happens at suspend/resume time
*/
#define AHB_MAPB 0xCA4
#define AHB_CRW(i) (AHB_MAPB + 0 + (i) * 0x10)
#define AHB_CRW_SZMASK 0xfffffc00UL
#define AHB_CRW_ENABLE (1 << 0)
#define AHB_CRW_WTYPE_MEM (2 << 1)
#define AHB_CRW_ROE (1UL << 3) /* Relax Order Ena */
#define AHB_CRW_NSE (1UL << 4) /* No Snoop Enable */
#define AHB_BASE(i) (AHB_MAPB + 4 + (i) * 0x10)
#define AHB_PEXLBASE(i) (AHB_MAPB + 8 + (i) * 0x10)
#define AHB_PEXHBASE(i) (AHB_MAPB + 12 + (i) * 0x10)
/* At probe time, enable mapping for each endpoint, using the pdev */
static void sta2x11_map_ep(struct pci_dev *pdev)
{
struct sta2x11_mapping *map = sta2x11_pdev_to_mapping(pdev);
int i;
if (!map)
return;
pci_read_config_dword(pdev, AHB_BASE(0), &map->amba_base);
/* Configure AHB mapping */
pci_write_config_dword(pdev, AHB_PEXLBASE(0), 0);
pci_write_config_dword(pdev, AHB_PEXHBASE(0), 0);
pci_write_config_dword(pdev, AHB_CRW(0), STA2X11_AMBA_SIZE |
AHB_CRW_WTYPE_MEM | AHB_CRW_ENABLE);
/* Disable all the other windows */
for (i = 1; i < STA2X11_NR_FUNCS; i++)
pci_write_config_dword(pdev, AHB_CRW(i), 0);
dev_info(&pdev->dev,
"sta2x11: Map EP %i: AMBA address %#8x-%#8x\n",
sta2x11_pdev_to_ep(pdev), map->amba_base,
map->amba_base + STA2X11_AMBA_SIZE - 1);
}
DECLARE_PCI_FIXUP_ENABLE(PCI_VENDOR_ID_STMICRO, PCI_ANY_ID, sta2x11_map_ep);
#ifdef CONFIG_PM /* Some register values must be saved and restored */
static void suspend_mapping(struct pci_dev *pdev)
{
struct sta2x11_mapping *map = sta2x11_pdev_to_mapping(pdev);
int i;
if (!map)
return;
if (map->is_suspended)
return;
map->is_suspended = 1;
/* Save all window configs */
for (i = 0; i < STA2X11_NR_FUNCS; i++) {
struct sta2x11_ahb_regs *regs = map->regs + i;
pci_read_config_dword(pdev, AHB_BASE(i), &regs->base);
pci_read_config_dword(pdev, AHB_PEXLBASE(i), &regs->pexlbase);
pci_read_config_dword(pdev, AHB_PEXHBASE(i), &regs->pexhbase);
pci_read_config_dword(pdev, AHB_CRW(i), &regs->crw);
}
}
DECLARE_PCI_FIXUP_SUSPEND(PCI_VENDOR_ID_STMICRO, PCI_ANY_ID, suspend_mapping);
static void resume_mapping(struct pci_dev *pdev)
{
struct sta2x11_mapping *map = sta2x11_pdev_to_mapping(pdev);
int i;
if (!map)
return;
if (!map->is_suspended)
goto out;
map->is_suspended = 0;
/* Restore all window configs */
for (i = 0; i < STA2X11_NR_FUNCS; i++) {
struct sta2x11_ahb_regs *regs = map->regs + i;
pci_write_config_dword(pdev, AHB_BASE(i), regs->base);
pci_write_config_dword(pdev, AHB_PEXLBASE(i), regs->pexlbase);
pci_write_config_dword(pdev, AHB_PEXHBASE(i), regs->pexhbase);
pci_write_config_dword(pdev, AHB_CRW(i), regs->crw);
}
out:
pci_set_master(pdev); /* Like at boot, enable master on all devices */
}
DECLARE_PCI_FIXUP_RESUME(PCI_VENDOR_ID_STMICRO, PCI_ANY_ID, resume_mapping);
#endif /* CONFIG_PM */
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