| /* |
| * 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. |
| * |
| * 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 |
| * |
| */ |
| |
| #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), ®s->base); |
| pci_read_config_dword(pdev, AHB_PEXLBASE(i), ®s->pexlbase); |
| pci_read_config_dword(pdev, AHB_PEXHBASE(i), ®s->pexhbase); |
| pci_read_config_dword(pdev, AHB_CRW(i), ®s->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 */ |