mirror of https://gitee.com/openkylin/linux.git
553 lines
13 KiB
C
553 lines
13 KiB
C
/*
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* HP zx1 AGPGART routines.
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*
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* (c) Copyright 2002, 2003 Hewlett-Packard Development Company, L.P.
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* Bjorn Helgaas <bjorn.helgaas@hp.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/acpi.h>
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#include <linux/module.h>
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#include <linux/pci.h>
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#include <linux/init.h>
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#include <linux/agp_backend.h>
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#include <asm/acpi-ext.h>
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#include "agp.h"
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#ifndef log2
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#define log2(x) ffz(~(x))
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#endif
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#define HP_ZX1_IOC_OFFSET 0x1000 /* ACPI reports SBA, we want IOC */
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/* HP ZX1 IOC registers */
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#define HP_ZX1_IBASE 0x300
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#define HP_ZX1_IMASK 0x308
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#define HP_ZX1_PCOM 0x310
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#define HP_ZX1_TCNFG 0x318
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#define HP_ZX1_PDIR_BASE 0x320
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#define HP_ZX1_IOVA_BASE GB(1UL)
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#define HP_ZX1_IOVA_SIZE GB(1UL)
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#define HP_ZX1_GART_SIZE (HP_ZX1_IOVA_SIZE / 2)
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#define HP_ZX1_SBA_IOMMU_COOKIE 0x0000badbadc0ffeeUL
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#define HP_ZX1_PDIR_VALID_BIT 0x8000000000000000UL
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#define HP_ZX1_IOVA_TO_PDIR(va) ((va - hp_private.iova_base) >> hp_private.io_tlb_shift)
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#define AGP8X_MODE_BIT 3
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#define AGP8X_MODE (1 << AGP8X_MODE_BIT)
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/* AGP bridge need not be PCI device, but DRM thinks it is. */
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static struct pci_dev fake_bridge_dev;
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static int hp_zx1_gart_found;
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static struct aper_size_info_fixed hp_zx1_sizes[] =
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{
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{0, 0, 0}, /* filled in by hp_zx1_fetch_size() */
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};
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static struct gatt_mask hp_zx1_masks[] =
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{
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{.mask = HP_ZX1_PDIR_VALID_BIT, .type = 0}
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};
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static struct _hp_private {
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volatile u8 __iomem *ioc_regs;
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volatile u8 __iomem *lba_regs;
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int lba_cap_offset;
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u64 *io_pdir; // PDIR for entire IOVA
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u64 *gatt; // PDIR just for GART (subset of above)
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u64 gatt_entries;
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u64 iova_base;
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u64 gart_base;
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u64 gart_size;
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u64 io_pdir_size;
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int io_pdir_owner; // do we own it, or share it with sba_iommu?
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int io_page_size;
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int io_tlb_shift;
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int io_tlb_ps; // IOC ps config
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int io_pages_per_kpage;
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} hp_private;
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static int __init hp_zx1_ioc_shared(void)
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{
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struct _hp_private *hp = &hp_private;
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printk(KERN_INFO PFX "HP ZX1 IOC: IOPDIR shared with sba_iommu\n");
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/*
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* IOC already configured by sba_iommu module; just use
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* its setup. We assume:
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* - IOVA space is 1Gb in size
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* - first 512Mb is IOMMU, second 512Mb is GART
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*/
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hp->io_tlb_ps = readq(hp->ioc_regs+HP_ZX1_TCNFG);
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switch (hp->io_tlb_ps) {
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case 0: hp->io_tlb_shift = 12; break;
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case 1: hp->io_tlb_shift = 13; break;
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case 2: hp->io_tlb_shift = 14; break;
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case 3: hp->io_tlb_shift = 16; break;
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default:
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printk(KERN_ERR PFX "Invalid IOTLB page size "
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"configuration 0x%x\n", hp->io_tlb_ps);
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hp->gatt = NULL;
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hp->gatt_entries = 0;
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return -ENODEV;
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}
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hp->io_page_size = 1 << hp->io_tlb_shift;
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hp->io_pages_per_kpage = PAGE_SIZE / hp->io_page_size;
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hp->iova_base = readq(hp->ioc_regs+HP_ZX1_IBASE) & ~0x1;
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hp->gart_base = hp->iova_base + HP_ZX1_IOVA_SIZE - HP_ZX1_GART_SIZE;
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hp->gart_size = HP_ZX1_GART_SIZE;
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hp->gatt_entries = hp->gart_size / hp->io_page_size;
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hp->io_pdir = gart_to_virt(readq(hp->ioc_regs+HP_ZX1_PDIR_BASE));
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hp->gatt = &hp->io_pdir[HP_ZX1_IOVA_TO_PDIR(hp->gart_base)];
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if (hp->gatt[0] != HP_ZX1_SBA_IOMMU_COOKIE) {
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/* Normal case when no AGP device in system */
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hp->gatt = NULL;
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hp->gatt_entries = 0;
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printk(KERN_ERR PFX "No reserved IO PDIR entry found; "
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"GART disabled\n");
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return -ENODEV;
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}
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return 0;
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}
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static int __init
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hp_zx1_ioc_owner (void)
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{
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struct _hp_private *hp = &hp_private;
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printk(KERN_INFO PFX "HP ZX1 IOC: IOPDIR dedicated to GART\n");
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/*
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* Select an IOV page size no larger than system page size.
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*/
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if (PAGE_SIZE >= KB(64)) {
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hp->io_tlb_shift = 16;
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hp->io_tlb_ps = 3;
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} else if (PAGE_SIZE >= KB(16)) {
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hp->io_tlb_shift = 14;
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hp->io_tlb_ps = 2;
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} else if (PAGE_SIZE >= KB(8)) {
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hp->io_tlb_shift = 13;
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hp->io_tlb_ps = 1;
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} else {
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hp->io_tlb_shift = 12;
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hp->io_tlb_ps = 0;
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}
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hp->io_page_size = 1 << hp->io_tlb_shift;
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hp->io_pages_per_kpage = PAGE_SIZE / hp->io_page_size;
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hp->iova_base = HP_ZX1_IOVA_BASE;
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hp->gart_size = HP_ZX1_GART_SIZE;
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hp->gart_base = hp->iova_base + HP_ZX1_IOVA_SIZE - hp->gart_size;
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hp->gatt_entries = hp->gart_size / hp->io_page_size;
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hp->io_pdir_size = (HP_ZX1_IOVA_SIZE / hp->io_page_size) * sizeof(u64);
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return 0;
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}
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static int __init
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hp_zx1_ioc_init (u64 hpa)
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{
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struct _hp_private *hp = &hp_private;
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hp->ioc_regs = ioremap(hpa, 1024);
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if (!hp->ioc_regs)
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return -ENOMEM;
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/*
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* If the IOTLB is currently disabled, we can take it over.
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* Otherwise, we have to share with sba_iommu.
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*/
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hp->io_pdir_owner = (readq(hp->ioc_regs+HP_ZX1_IBASE) & 0x1) == 0;
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if (hp->io_pdir_owner)
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return hp_zx1_ioc_owner();
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return hp_zx1_ioc_shared();
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}
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static int
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hp_zx1_lba_find_capability (volatile u8 __iomem *hpa, int cap)
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{
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u16 status;
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u8 pos, id;
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int ttl = 48;
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status = readw(hpa+PCI_STATUS);
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if (!(status & PCI_STATUS_CAP_LIST))
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return 0;
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pos = readb(hpa+PCI_CAPABILITY_LIST);
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while (ttl-- && pos >= 0x40) {
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pos &= ~3;
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id = readb(hpa+pos+PCI_CAP_LIST_ID);
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if (id == 0xff)
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break;
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if (id == cap)
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return pos;
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pos = readb(hpa+pos+PCI_CAP_LIST_NEXT);
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}
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return 0;
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}
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static int __init
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hp_zx1_lba_init (u64 hpa)
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{
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struct _hp_private *hp = &hp_private;
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int cap;
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hp->lba_regs = ioremap(hpa, 256);
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if (!hp->lba_regs)
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return -ENOMEM;
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hp->lba_cap_offset = hp_zx1_lba_find_capability(hp->lba_regs, PCI_CAP_ID_AGP);
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cap = readl(hp->lba_regs+hp->lba_cap_offset) & 0xff;
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if (cap != PCI_CAP_ID_AGP) {
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printk(KERN_ERR PFX "Invalid capability ID 0x%02x at 0x%x\n",
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cap, hp->lba_cap_offset);
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return -ENODEV;
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}
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return 0;
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}
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static int
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hp_zx1_fetch_size(void)
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{
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int size;
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size = hp_private.gart_size / MB(1);
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hp_zx1_sizes[0].size = size;
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agp_bridge->current_size = (void *) &hp_zx1_sizes[0];
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return size;
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}
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static int
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hp_zx1_configure (void)
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{
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struct _hp_private *hp = &hp_private;
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agp_bridge->gart_bus_addr = hp->gart_base;
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agp_bridge->capndx = hp->lba_cap_offset;
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agp_bridge->mode = readl(hp->lba_regs+hp->lba_cap_offset+PCI_AGP_STATUS);
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if (hp->io_pdir_owner) {
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writel(virt_to_gart(hp->io_pdir), hp->ioc_regs+HP_ZX1_PDIR_BASE);
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readl(hp->ioc_regs+HP_ZX1_PDIR_BASE);
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writel(hp->io_tlb_ps, hp->ioc_regs+HP_ZX1_TCNFG);
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readl(hp->ioc_regs+HP_ZX1_TCNFG);
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writel((unsigned int)(~(HP_ZX1_IOVA_SIZE-1)), hp->ioc_regs+HP_ZX1_IMASK);
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readl(hp->ioc_regs+HP_ZX1_IMASK);
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writel(hp->iova_base|1, hp->ioc_regs+HP_ZX1_IBASE);
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readl(hp->ioc_regs+HP_ZX1_IBASE);
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writel(hp->iova_base|log2(HP_ZX1_IOVA_SIZE), hp->ioc_regs+HP_ZX1_PCOM);
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readl(hp->ioc_regs+HP_ZX1_PCOM);
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}
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return 0;
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}
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static void
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hp_zx1_cleanup (void)
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{
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struct _hp_private *hp = &hp_private;
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if (hp->ioc_regs) {
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if (hp->io_pdir_owner) {
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writeq(0, hp->ioc_regs+HP_ZX1_IBASE);
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readq(hp->ioc_regs+HP_ZX1_IBASE);
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}
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iounmap(hp->ioc_regs);
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}
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if (hp->lba_regs)
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iounmap(hp->lba_regs);
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}
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static void
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hp_zx1_tlbflush (struct agp_memory *mem)
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{
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struct _hp_private *hp = &hp_private;
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writeq(hp->gart_base | log2(hp->gart_size), hp->ioc_regs+HP_ZX1_PCOM);
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readq(hp->ioc_regs+HP_ZX1_PCOM);
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}
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static int
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hp_zx1_create_gatt_table (struct agp_bridge_data *bridge)
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{
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struct _hp_private *hp = &hp_private;
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int i;
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if (hp->io_pdir_owner) {
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hp->io_pdir = (u64 *) __get_free_pages(GFP_KERNEL,
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get_order(hp->io_pdir_size));
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if (!hp->io_pdir) {
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printk(KERN_ERR PFX "Couldn't allocate contiguous "
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"memory for I/O PDIR\n");
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hp->gatt = NULL;
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hp->gatt_entries = 0;
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return -ENOMEM;
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}
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memset(hp->io_pdir, 0, hp->io_pdir_size);
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hp->gatt = &hp->io_pdir[HP_ZX1_IOVA_TO_PDIR(hp->gart_base)];
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}
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for (i = 0; i < hp->gatt_entries; i++) {
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hp->gatt[i] = (unsigned long) agp_bridge->scratch_page;
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}
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return 0;
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}
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static int
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hp_zx1_free_gatt_table (struct agp_bridge_data *bridge)
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{
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struct _hp_private *hp = &hp_private;
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if (hp->io_pdir_owner)
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free_pages((unsigned long) hp->io_pdir,
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get_order(hp->io_pdir_size));
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else
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hp->gatt[0] = HP_ZX1_SBA_IOMMU_COOKIE;
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return 0;
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}
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static int
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hp_zx1_insert_memory (struct agp_memory *mem, off_t pg_start, int type)
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{
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struct _hp_private *hp = &hp_private;
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int i, k;
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off_t j, io_pg_start;
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int io_pg_count;
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if (type != 0 || mem->type != 0) {
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return -EINVAL;
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}
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io_pg_start = hp->io_pages_per_kpage * pg_start;
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io_pg_count = hp->io_pages_per_kpage * mem->page_count;
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if ((io_pg_start + io_pg_count) > hp->gatt_entries) {
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return -EINVAL;
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}
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j = io_pg_start;
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while (j < (io_pg_start + io_pg_count)) {
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if (hp->gatt[j]) {
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return -EBUSY;
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}
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j++;
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}
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if (mem->is_flushed == FALSE) {
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global_cache_flush();
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mem->is_flushed = TRUE;
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}
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for (i = 0, j = io_pg_start; i < mem->page_count; i++) {
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unsigned long paddr;
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paddr = mem->memory[i];
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for (k = 0;
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k < hp->io_pages_per_kpage;
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k++, j++, paddr += hp->io_page_size) {
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hp->gatt[j] =
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agp_bridge->driver->mask_memory(agp_bridge,
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paddr, type);
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}
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}
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agp_bridge->driver->tlb_flush(mem);
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return 0;
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}
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static int
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hp_zx1_remove_memory (struct agp_memory *mem, off_t pg_start, int type)
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{
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struct _hp_private *hp = &hp_private;
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int i, io_pg_start, io_pg_count;
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if (type != 0 || mem->type != 0) {
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return -EINVAL;
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}
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io_pg_start = hp->io_pages_per_kpage * pg_start;
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io_pg_count = hp->io_pages_per_kpage * mem->page_count;
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for (i = io_pg_start; i < io_pg_count + io_pg_start; i++) {
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hp->gatt[i] = agp_bridge->scratch_page;
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}
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agp_bridge->driver->tlb_flush(mem);
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return 0;
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}
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static unsigned long
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hp_zx1_mask_memory (struct agp_bridge_data *bridge,
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unsigned long addr, int type)
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{
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return HP_ZX1_PDIR_VALID_BIT | addr;
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}
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static void
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hp_zx1_enable (struct agp_bridge_data *bridge, u32 mode)
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{
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struct _hp_private *hp = &hp_private;
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u32 command;
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command = readl(hp->lba_regs+hp->lba_cap_offset+PCI_AGP_STATUS);
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command = agp_collect_device_status(bridge, mode, command);
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command |= 0x00000100;
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writel(command, hp->lba_regs+hp->lba_cap_offset+PCI_AGP_COMMAND);
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agp_device_command(command, (mode & AGP8X_MODE) != 0);
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}
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struct agp_bridge_driver hp_zx1_driver = {
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.owner = THIS_MODULE,
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.size_type = FIXED_APER_SIZE,
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.configure = hp_zx1_configure,
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.fetch_size = hp_zx1_fetch_size,
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.cleanup = hp_zx1_cleanup,
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.tlb_flush = hp_zx1_tlbflush,
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.mask_memory = hp_zx1_mask_memory,
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.masks = hp_zx1_masks,
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.agp_enable = hp_zx1_enable,
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.cache_flush = global_cache_flush,
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.create_gatt_table = hp_zx1_create_gatt_table,
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.free_gatt_table = hp_zx1_free_gatt_table,
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.insert_memory = hp_zx1_insert_memory,
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.remove_memory = hp_zx1_remove_memory,
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.alloc_by_type = agp_generic_alloc_by_type,
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.free_by_type = agp_generic_free_by_type,
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.agp_alloc_page = agp_generic_alloc_page,
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.agp_destroy_page = agp_generic_destroy_page,
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.cant_use_aperture = 1,
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};
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static int __init
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hp_zx1_setup (u64 ioc_hpa, u64 lba_hpa)
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{
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struct agp_bridge_data *bridge;
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int error = 0;
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error = hp_zx1_ioc_init(ioc_hpa);
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if (error)
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goto fail;
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error = hp_zx1_lba_init(lba_hpa);
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if (error)
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goto fail;
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bridge = agp_alloc_bridge();
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if (!bridge) {
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error = -ENOMEM;
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goto fail;
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}
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bridge->driver = &hp_zx1_driver;
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fake_bridge_dev.vendor = PCI_VENDOR_ID_HP;
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fake_bridge_dev.device = PCI_DEVICE_ID_HP_PCIX_LBA;
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bridge->dev = &fake_bridge_dev;
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error = agp_add_bridge(bridge);
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fail:
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if (error)
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hp_zx1_cleanup();
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return error;
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}
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static acpi_status __init
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zx1_gart_probe (acpi_handle obj, u32 depth, void *context, void **ret)
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{
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acpi_handle handle, parent;
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acpi_status status;
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struct acpi_buffer buffer;
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struct acpi_device_info *info;
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u64 lba_hpa, sba_hpa, length;
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int match;
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status = hp_acpi_csr_space(obj, &lba_hpa, &length);
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if (ACPI_FAILURE(status))
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return AE_OK; /* keep looking for another bridge */
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|
|
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/* Look for an enclosing IOC scope and find its CSR space */
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handle = obj;
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do {
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buffer.length = ACPI_ALLOCATE_LOCAL_BUFFER;
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status = acpi_get_object_info(handle, &buffer);
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if (ACPI_SUCCESS(status)) {
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/* TBD check _CID also */
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info = buffer.pointer;
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info->hardware_id.value[sizeof(info->hardware_id)-1] = '\0';
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match = (strcmp(info->hardware_id.value, "HWP0001") == 0);
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kfree(info);
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|
if (match) {
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status = hp_acpi_csr_space(handle, &sba_hpa, &length);
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if (ACPI_SUCCESS(status))
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|
break;
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else {
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|
printk(KERN_ERR PFX "Detected HP ZX1 "
|
|
"AGP LBA but no IOC.\n");
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|
return AE_OK;
|
|
}
|
|
}
|
|
}
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|
|
|
status = acpi_get_parent(handle, &parent);
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|
handle = parent;
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} while (ACPI_SUCCESS(status));
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|
|
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if (hp_zx1_setup(sba_hpa + HP_ZX1_IOC_OFFSET, lba_hpa))
|
|
return AE_OK;
|
|
|
|
printk(KERN_INFO PFX "Detected HP ZX1 %s AGP chipset (ioc=%lx, lba=%lx)\n",
|
|
(char *) context, sba_hpa + HP_ZX1_IOC_OFFSET, lba_hpa);
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|
|
|
hp_zx1_gart_found = 1;
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|
return AE_CTRL_TERMINATE; /* we only support one bridge; quit looking */
|
|
}
|
|
|
|
static int __init
|
|
agp_hp_init (void)
|
|
{
|
|
if (agp_off)
|
|
return -EINVAL;
|
|
|
|
acpi_get_devices("HWP0003", zx1_gart_probe, "HWP0003", NULL);
|
|
if (hp_zx1_gart_found)
|
|
return 0;
|
|
|
|
acpi_get_devices("HWP0007", zx1_gart_probe, "HWP0007", NULL);
|
|
if (hp_zx1_gart_found)
|
|
return 0;
|
|
|
|
return -ENODEV;
|
|
}
|
|
|
|
static void __exit
|
|
agp_hp_cleanup (void)
|
|
{
|
|
}
|
|
|
|
module_init(agp_hp_init);
|
|
module_exit(agp_hp_cleanup);
|
|
|
|
MODULE_LICENSE("GPL and additional rights");
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