diff options
Diffstat (limited to 'arch/arm/mach-msm/iommu.c')
-rw-r--r-- | arch/arm/mach-msm/iommu.c | 597 |
1 files changed, 597 insertions, 0 deletions
diff --git a/arch/arm/mach-msm/iommu.c b/arch/arm/mach-msm/iommu.c new file mode 100644 index 0000000..f71747d --- /dev/null +++ b/arch/arm/mach-msm/iommu.c @@ -0,0 +1,597 @@ +/* Copyright (c) 2010, Code Aurora Forum. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 and + * only 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., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA. + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/errno.h> +#include <linux/io.h> +#include <linux/interrupt.h> +#include <linux/list.h> +#include <linux/spinlock.h> +#include <linux/slab.h> +#include <linux/iommu.h> + +#include <asm/cacheflush.h> +#include <asm/sizes.h> + +#include <mach/iommu_hw-8xxx.h> +#include <mach/iommu.h> + +DEFINE_SPINLOCK(msm_iommu_lock); + +struct msm_priv { + unsigned long *pgtable; + struct list_head list_attached; +}; + +static void __flush_iotlb(struct iommu_domain *domain) +{ + struct msm_priv *priv = domain->priv; + struct msm_iommu_drvdata *iommu_drvdata; + struct msm_iommu_ctx_drvdata *ctx_drvdata; + +#ifndef CONFIG_IOMMU_PGTABLES_L2 + unsigned long *fl_table = priv->pgtable; + int i; + + dmac_flush_range(fl_table, fl_table + SZ_16K); + + for (i = 0; i < NUM_FL_PTE; i++) + if ((fl_table[i] & 0x03) == FL_TYPE_TABLE) { + void *sl_table = __va(fl_table[i] & FL_BASE_MASK); + dmac_flush_range(sl_table, sl_table + SZ_4K); + } +#endif + + list_for_each_entry(ctx_drvdata, &priv->list_attached, attached_elm) { + if (!ctx_drvdata->pdev || !ctx_drvdata->pdev->dev.parent) + BUG(); + + iommu_drvdata = dev_get_drvdata(ctx_drvdata->pdev->dev.parent); + SET_CTX_TLBIALL(iommu_drvdata->base, ctx_drvdata->num, 0); + } +} + +static void __reset_context(void __iomem *base, int ctx) +{ + SET_BPRCOSH(base, ctx, 0); + SET_BPRCISH(base, ctx, 0); + SET_BPRCNSH(base, ctx, 0); + SET_BPSHCFG(base, ctx, 0); + SET_BPMTCFG(base, ctx, 0); + SET_ACTLR(base, ctx, 0); + SET_SCTLR(base, ctx, 0); + SET_FSRRESTORE(base, ctx, 0); + SET_TTBR0(base, ctx, 0); + SET_TTBR1(base, ctx, 0); + SET_TTBCR(base, ctx, 0); + SET_BFBCR(base, ctx, 0); + SET_PAR(base, ctx, 0); + SET_FAR(base, ctx, 0); + SET_CTX_TLBIALL(base, ctx, 0); + SET_TLBFLPTER(base, ctx, 0); + SET_TLBSLPTER(base, ctx, 0); + SET_TLBLKCR(base, ctx, 0); + SET_PRRR(base, ctx, 0); + SET_NMRR(base, ctx, 0); + SET_CONTEXTIDR(base, ctx, 0); +} + +static void __program_context(void __iomem *base, int ctx, phys_addr_t pgtable) +{ + __reset_context(base, ctx); + + /* Set up HTW mode */ + /* TLB miss configuration: perform HTW on miss */ + SET_TLBMCFG(base, ctx, 0x3); + + /* V2P configuration: HTW for access */ + SET_V2PCFG(base, ctx, 0x3); + + SET_TTBCR(base, ctx, 0); + SET_TTBR0_PA(base, ctx, (pgtable >> 14)); + + /* Invalidate the TLB for this context */ + SET_CTX_TLBIALL(base, ctx, 0); + + /* Set interrupt number to "secure" interrupt */ + SET_IRPTNDX(base, ctx, 0); + + /* Enable context fault interrupt */ + SET_CFEIE(base, ctx, 1); + + /* Stall access on a context fault and let the handler deal with it */ + SET_CFCFG(base, ctx, 1); + + /* Redirect all cacheable requests to L2 slave port. */ + SET_RCISH(base, ctx, 1); + SET_RCOSH(base, ctx, 1); + SET_RCNSH(base, ctx, 1); + + /* Turn on TEX Remap */ + SET_TRE(base, ctx, 1); + + /* Do not configure PRRR / NMRR on the IOMMU for now. We will assume + * TEX class 0 for everything until attributes are properly worked out + */ + SET_PRRR(base, ctx, 0); + SET_NMRR(base, ctx, 0); + + /* Turn on BFB prefetch */ + SET_BFBDFE(base, ctx, 1); + +#ifdef CONFIG_IOMMU_PGTABLES_L2 + /* Configure page tables as inner-cacheable and shareable to reduce + * the TLB miss penalty. + */ + SET_TTBR0_SH(base, ctx, 1); + SET_TTBR1_SH(base, ctx, 1); + + SET_TTBR0_NOS(base, ctx, 1); + SET_TTBR1_NOS(base, ctx, 1); + + SET_TTBR0_IRGNH(base, ctx, 0); /* WB, WA */ + SET_TTBR0_IRGNL(base, ctx, 1); + + SET_TTBR1_IRGNH(base, ctx, 0); /* WB, WA */ + SET_TTBR1_IRGNL(base, ctx, 1); + + SET_TTBR0_ORGN(base, ctx, 1); /* WB, WA */ + SET_TTBR1_ORGN(base, ctx, 1); /* WB, WA */ +#endif + + /* Enable the MMU */ + SET_M(base, ctx, 1); +} + +static int msm_iommu_domain_init(struct iommu_domain *domain) +{ + struct msm_priv *priv = kzalloc(sizeof(*priv), GFP_KERNEL); + + if (!priv) + goto fail_nomem; + + INIT_LIST_HEAD(&priv->list_attached); + priv->pgtable = (unsigned long *)__get_free_pages(GFP_KERNEL, + get_order(SZ_16K)); + + if (!priv->pgtable) + goto fail_nomem; + + memset(priv->pgtable, 0, SZ_16K); + domain->priv = priv; + return 0; + +fail_nomem: + kfree(priv); + return -ENOMEM; +} + +static void msm_iommu_domain_destroy(struct iommu_domain *domain) +{ + struct msm_priv *priv; + unsigned long flags; + unsigned long *fl_table; + int i; + + spin_lock_irqsave(&msm_iommu_lock, flags); + priv = domain->priv; + domain->priv = NULL; + + if (priv) { + fl_table = priv->pgtable; + + for (i = 0; i < NUM_FL_PTE; i++) + if ((fl_table[i] & 0x03) == FL_TYPE_TABLE) + free_page((unsigned long) __va(((fl_table[i]) & + FL_BASE_MASK))); + + free_pages((unsigned long)priv->pgtable, get_order(SZ_16K)); + priv->pgtable = NULL; + } + + kfree(priv); + spin_unlock_irqrestore(&msm_iommu_lock, flags); +} + +static int msm_iommu_attach_dev(struct iommu_domain *domain, struct device *dev) +{ + struct msm_priv *priv; + struct msm_iommu_ctx_dev *ctx_dev; + struct msm_iommu_drvdata *iommu_drvdata; + struct msm_iommu_ctx_drvdata *ctx_drvdata; + struct msm_iommu_ctx_drvdata *tmp_drvdata; + int ret = 0; + unsigned long flags; + + spin_lock_irqsave(&msm_iommu_lock, flags); + + priv = domain->priv; + + if (!priv || !dev) { + ret = -EINVAL; + goto fail; + } + + iommu_drvdata = dev_get_drvdata(dev->parent); + ctx_drvdata = dev_get_drvdata(dev); + ctx_dev = dev->platform_data; + + if (!iommu_drvdata || !ctx_drvdata || !ctx_dev) { + ret = -EINVAL; + goto fail; + } + + list_for_each_entry(tmp_drvdata, &priv->list_attached, attached_elm) + if (tmp_drvdata == ctx_drvdata) { + ret = -EBUSY; + goto fail; + } + + __program_context(iommu_drvdata->base, ctx_dev->num, + __pa(priv->pgtable)); + + list_add(&(ctx_drvdata->attached_elm), &priv->list_attached); + __flush_iotlb(domain); + +fail: + spin_unlock_irqrestore(&msm_iommu_lock, flags); + return ret; +} + +static void msm_iommu_detach_dev(struct iommu_domain *domain, + struct device *dev) +{ + struct msm_priv *priv; + struct msm_iommu_ctx_dev *ctx_dev; + struct msm_iommu_drvdata *iommu_drvdata; + struct msm_iommu_ctx_drvdata *ctx_drvdata; + unsigned long flags; + + spin_lock_irqsave(&msm_iommu_lock, flags); + priv = domain->priv; + + if (!priv || !dev) + goto fail; + + iommu_drvdata = dev_get_drvdata(dev->parent); + ctx_drvdata = dev_get_drvdata(dev); + ctx_dev = dev->platform_data; + + if (!iommu_drvdata || !ctx_drvdata || !ctx_dev) + goto fail; + + __flush_iotlb(domain); + __reset_context(iommu_drvdata->base, ctx_dev->num); + list_del_init(&ctx_drvdata->attached_elm); + +fail: + spin_unlock_irqrestore(&msm_iommu_lock, flags); +} + +static int msm_iommu_map(struct iommu_domain *domain, unsigned long va, + phys_addr_t pa, int order, int prot) +{ + struct msm_priv *priv; + unsigned long flags; + unsigned long *fl_table; + unsigned long *fl_pte; + unsigned long fl_offset; + unsigned long *sl_table; + unsigned long *sl_pte; + unsigned long sl_offset; + size_t len = 0x1000UL << order; + int ret = 0; + + spin_lock_irqsave(&msm_iommu_lock, flags); + priv = domain->priv; + + if (!priv) { + ret = -EINVAL; + goto fail; + } + + fl_table = priv->pgtable; + + if (len != SZ_16M && len != SZ_1M && + len != SZ_64K && len != SZ_4K) { + pr_debug("Bad size: %d\n", len); + ret = -EINVAL; + goto fail; + } + + if (!fl_table) { + pr_debug("Null page table\n"); + ret = -EINVAL; + goto fail; + } + + fl_offset = FL_OFFSET(va); /* Upper 12 bits */ + fl_pte = fl_table + fl_offset; /* int pointers, 4 bytes */ + + if (len == SZ_16M) { + int i = 0; + for (i = 0; i < 16; i++) + *(fl_pte+i) = (pa & 0xFF000000) | FL_SUPERSECTION | + FL_AP_READ | FL_AP_WRITE | FL_TYPE_SECT | + FL_SHARED; + } + + if (len == SZ_1M) + *fl_pte = (pa & 0xFFF00000) | FL_AP_READ | FL_AP_WRITE | + FL_TYPE_SECT | FL_SHARED; + + /* Need a 2nd level table */ + if ((len == SZ_4K || len == SZ_64K) && (*fl_pte) == 0) { + unsigned long *sl; + sl = (unsigned long *) __get_free_pages(GFP_KERNEL, + get_order(SZ_4K)); + + if (!sl) { + pr_debug("Could not allocate second level table\n"); + ret = -ENOMEM; + goto fail; + } + + memset(sl, 0, SZ_4K); + *fl_pte = ((((int)__pa(sl)) & FL_BASE_MASK) | FL_TYPE_TABLE); + } + + sl_table = (unsigned long *) __va(((*fl_pte) & FL_BASE_MASK)); + sl_offset = SL_OFFSET(va); + sl_pte = sl_table + sl_offset; + + + if (len == SZ_4K) + *sl_pte = (pa & SL_BASE_MASK_SMALL) | SL_AP0 | SL_AP1 | + SL_SHARED | SL_TYPE_SMALL; + + if (len == SZ_64K) { + int i; + + for (i = 0; i < 16; i++) + *(sl_pte+i) = (pa & SL_BASE_MASK_LARGE) | SL_AP0 | + SL_AP1 | SL_SHARED | SL_TYPE_LARGE; + } + + __flush_iotlb(domain); +fail: + spin_unlock_irqrestore(&msm_iommu_lock, flags); + return ret; +} + +static int msm_iommu_unmap(struct iommu_domain *domain, unsigned long va, + int order) +{ + struct msm_priv *priv; + unsigned long flags; + unsigned long *fl_table; + unsigned long *fl_pte; + unsigned long fl_offset; + unsigned long *sl_table; + unsigned long *sl_pte; + unsigned long sl_offset; + size_t len = 0x1000UL << order; + int i, ret = 0; + + spin_lock_irqsave(&msm_iommu_lock, flags); + + priv = domain->priv; + + if (!priv) { + ret = -ENODEV; + goto fail; + } + + fl_table = priv->pgtable; + + if (len != SZ_16M && len != SZ_1M && + len != SZ_64K && len != SZ_4K) { + pr_debug("Bad length: %d\n", len); + ret = -EINVAL; + goto fail; + } + + if (!fl_table) { + pr_debug("Null page table\n"); + ret = -EINVAL; + goto fail; + } + + fl_offset = FL_OFFSET(va); /* Upper 12 bits */ + fl_pte = fl_table + fl_offset; /* int pointers, 4 bytes */ + + if (*fl_pte == 0) { + pr_debug("First level PTE is 0\n"); + ret = -ENODEV; + goto fail; + } + + /* Unmap supersection */ + if (len == SZ_16M) + for (i = 0; i < 16; i++) + *(fl_pte+i) = 0; + + if (len == SZ_1M) + *fl_pte = 0; + + sl_table = (unsigned long *) __va(((*fl_pte) & FL_BASE_MASK)); + sl_offset = SL_OFFSET(va); + sl_pte = sl_table + sl_offset; + + if (len == SZ_64K) { + for (i = 0; i < 16; i++) + *(sl_pte+i) = 0; + } + + if (len == SZ_4K) + *sl_pte = 0; + + if (len == SZ_4K || len == SZ_64K) { + int used = 0; + + for (i = 0; i < NUM_SL_PTE; i++) + if (sl_table[i]) + used = 1; + if (!used) { + free_page((unsigned long)sl_table); + *fl_pte = 0; + } + } + + __flush_iotlb(domain); +fail: + spin_unlock_irqrestore(&msm_iommu_lock, flags); + return ret; +} + +static phys_addr_t msm_iommu_iova_to_phys(struct iommu_domain *domain, + unsigned long va) +{ + struct msm_priv *priv; + struct msm_iommu_drvdata *iommu_drvdata; + struct msm_iommu_ctx_drvdata *ctx_drvdata; + unsigned int par; + unsigned long flags; + void __iomem *base; + phys_addr_t ret = 0; + int ctx; + + spin_lock_irqsave(&msm_iommu_lock, flags); + + priv = domain->priv; + if (list_empty(&priv->list_attached)) + goto fail; + + ctx_drvdata = list_entry(priv->list_attached.next, + struct msm_iommu_ctx_drvdata, attached_elm); + iommu_drvdata = dev_get_drvdata(ctx_drvdata->pdev->dev.parent); + + base = iommu_drvdata->base; + ctx = ctx_drvdata->num; + + /* Invalidate context TLB */ + SET_CTX_TLBIALL(base, ctx, 0); + SET_V2PPR_VA(base, ctx, va >> V2Pxx_VA_SHIFT); + + if (GET_FAULT(base, ctx)) + goto fail; + + par = GET_PAR(base, ctx); + + /* We are dealing with a supersection */ + if (GET_NOFAULT_SS(base, ctx)) + ret = (par & 0xFF000000) | (va & 0x00FFFFFF); + else /* Upper 20 bits from PAR, lower 12 from VA */ + ret = (par & 0xFFFFF000) | (va & 0x00000FFF); + +fail: + spin_unlock_irqrestore(&msm_iommu_lock, flags); + return ret; +} + +static int msm_iommu_domain_has_cap(struct iommu_domain *domain, + unsigned long cap) +{ + return 0; +} + +static void print_ctx_regs(void __iomem *base, int ctx) +{ + unsigned int fsr = GET_FSR(base, ctx); + pr_err("FAR = %08x PAR = %08x\n", + GET_FAR(base, ctx), GET_PAR(base, ctx)); + pr_err("FSR = %08x [%s%s%s%s%s%s%s%s%s%s]\n", fsr, + (fsr & 0x02) ? "TF " : "", + (fsr & 0x04) ? "AFF " : "", + (fsr & 0x08) ? "APF " : "", + (fsr & 0x10) ? "TLBMF " : "", + (fsr & 0x20) ? "HTWDEEF " : "", + (fsr & 0x40) ? "HTWSEEF " : "", + (fsr & 0x80) ? "MHF " : "", + (fsr & 0x10000) ? "SL " : "", + (fsr & 0x40000000) ? "SS " : "", + (fsr & 0x80000000) ? "MULTI " : ""); + + pr_err("FSYNR0 = %08x FSYNR1 = %08x\n", + GET_FSYNR0(base, ctx), GET_FSYNR1(base, ctx)); + pr_err("TTBR0 = %08x TTBR1 = %08x\n", + GET_TTBR0(base, ctx), GET_TTBR1(base, ctx)); + pr_err("SCTLR = %08x ACTLR = %08x\n", + GET_SCTLR(base, ctx), GET_ACTLR(base, ctx)); + pr_err("PRRR = %08x NMRR = %08x\n", + GET_PRRR(base, ctx), GET_NMRR(base, ctx)); +} + +irqreturn_t msm_iommu_fault_handler(int irq, void *dev_id) +{ + struct msm_iommu_drvdata *drvdata = dev_id; + void __iomem *base; + unsigned int fsr = 0; + int ncb = 0, i = 0; + + spin_lock(&msm_iommu_lock); + + if (!drvdata) { + pr_err("Invalid device ID in context interrupt handler\n"); + goto fail; + } + + base = drvdata->base; + + pr_err("===== WOAH! =====\n"); + pr_err("Unexpected IOMMU page fault!\n"); + pr_err("base = %08x\n", (unsigned int) base); + + ncb = GET_NCB(base)+1; + for (i = 0; i < ncb; i++) { + fsr = GET_FSR(base, i); + if (fsr) { + pr_err("Fault occurred in context %d.\n", i); + pr_err("Interesting registers:\n"); + print_ctx_regs(base, i); + SET_FSR(base, i, 0x4000000F); + } + } +fail: + spin_unlock(&msm_iommu_lock); + return 0; +} + +static struct iommu_ops msm_iommu_ops = { + .domain_init = msm_iommu_domain_init, + .domain_destroy = msm_iommu_domain_destroy, + .attach_dev = msm_iommu_attach_dev, + .detach_dev = msm_iommu_detach_dev, + .map = msm_iommu_map, + .unmap = msm_iommu_unmap, + .iova_to_phys = msm_iommu_iova_to_phys, + .domain_has_cap = msm_iommu_domain_has_cap +}; + +static int msm_iommu_init(void) +{ + register_iommu(&msm_iommu_ops); + return 0; +} + +subsys_initcall(msm_iommu_init); + +MODULE_LICENSE("GPL v2"); +MODULE_AUTHOR("Stepan Moskovchenko <stepanm@codeaurora.org>"); |