362 lines
8.5 KiB
C
362 lines
8.5 KiB
C
/*
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* omap iommu: omap2/3 architecture specific functions
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*
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* Copyright (C) 2008-2009 Nokia Corporation
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*
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* Written by Hiroshi DOYU <Hiroshi.DOYU@nokia.com>,
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* Paul Mundt and Toshihiro Kobayashi
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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/err.h>
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#include <linux/device.h>
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#include <linux/jiffies.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/stringify.h>
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#include <plat/iommu.h>
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/*
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* omap2 architecture specific register bit definitions
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*/
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#define IOMMU_ARCH_VERSION 0x00000011
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/* SYSCONF */
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#define MMU_SYS_IDLE_SHIFT 3
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#define MMU_SYS_IDLE_FORCE (0 << MMU_SYS_IDLE_SHIFT)
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#define MMU_SYS_IDLE_NONE (1 << MMU_SYS_IDLE_SHIFT)
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#define MMU_SYS_IDLE_SMART (2 << MMU_SYS_IDLE_SHIFT)
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#define MMU_SYS_IDLE_MASK (3 << MMU_SYS_IDLE_SHIFT)
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#define MMU_SYS_SOFTRESET (1 << 1)
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#define MMU_SYS_AUTOIDLE 1
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/* SYSSTATUS */
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#define MMU_SYS_RESETDONE 1
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/* IRQSTATUS & IRQENABLE */
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#define MMU_IRQ_MULTIHITFAULT (1 << 4)
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#define MMU_IRQ_TABLEWALKFAULT (1 << 3)
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#define MMU_IRQ_EMUMISS (1 << 2)
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#define MMU_IRQ_TRANSLATIONFAULT (1 << 1)
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#define MMU_IRQ_TLBMISS (1 << 0)
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#define __MMU_IRQ_FAULT \
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(MMU_IRQ_MULTIHITFAULT | MMU_IRQ_EMUMISS | MMU_IRQ_TRANSLATIONFAULT)
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#define MMU_IRQ_MASK \
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(__MMU_IRQ_FAULT | MMU_IRQ_TABLEWALKFAULT | MMU_IRQ_TLBMISS)
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#define MMU_IRQ_TWL_MASK (__MMU_IRQ_FAULT | MMU_IRQ_TABLEWALKFAULT)
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#define MMU_IRQ_TLB_MISS_MASK (__MMU_IRQ_FAULT | MMU_IRQ_TLBMISS)
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/* MMU_CNTL */
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#define MMU_CNTL_SHIFT 1
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#define MMU_CNTL_MASK (7 << MMU_CNTL_SHIFT)
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#define MMU_CNTL_EML_TLB (1 << 3)
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#define MMU_CNTL_TWL_EN (1 << 2)
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#define MMU_CNTL_MMU_EN (1 << 1)
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#define get_cam_va_mask(pgsz) \
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(((pgsz) == MMU_CAM_PGSZ_16M) ? 0xff000000 : \
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((pgsz) == MMU_CAM_PGSZ_1M) ? 0xfff00000 : \
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((pgsz) == MMU_CAM_PGSZ_64K) ? 0xffff0000 : \
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((pgsz) == MMU_CAM_PGSZ_4K) ? 0xfffff000 : 0)
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static void __iommu_set_twl(struct omap_iommu *obj, bool on)
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{
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u32 l = iommu_read_reg(obj, MMU_CNTL);
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if (on)
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iommu_write_reg(obj, MMU_IRQ_TWL_MASK, MMU_IRQENABLE);
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else
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iommu_write_reg(obj, MMU_IRQ_TLB_MISS_MASK, MMU_IRQENABLE);
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l &= ~MMU_CNTL_MASK;
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if (on)
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l |= (MMU_CNTL_MMU_EN | MMU_CNTL_TWL_EN);
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else
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l |= (MMU_CNTL_MMU_EN);
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iommu_write_reg(obj, l, MMU_CNTL);
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}
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static int omap2_iommu_enable(struct omap_iommu *obj)
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{
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u32 l, pa;
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unsigned long timeout;
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if (!obj->iopgd || !IS_ALIGNED((u32)obj->iopgd, SZ_16K))
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return -EINVAL;
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pa = virt_to_phys(obj->iopgd);
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if (!IS_ALIGNED(pa, SZ_16K))
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return -EINVAL;
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iommu_write_reg(obj, MMU_SYS_SOFTRESET, MMU_SYSCONFIG);
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timeout = jiffies + msecs_to_jiffies(20);
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do {
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l = iommu_read_reg(obj, MMU_SYSSTATUS);
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if (l & MMU_SYS_RESETDONE)
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break;
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} while (!time_after(jiffies, timeout));
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if (!(l & MMU_SYS_RESETDONE)) {
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dev_err(obj->dev, "can't take mmu out of reset\n");
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return -ENODEV;
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}
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l = iommu_read_reg(obj, MMU_REVISION);
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dev_info(obj->dev, "%s: version %d.%d\n", obj->name,
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(l >> 4) & 0xf, l & 0xf);
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l = iommu_read_reg(obj, MMU_SYSCONFIG);
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l &= ~MMU_SYS_IDLE_MASK;
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l |= (MMU_SYS_IDLE_SMART | MMU_SYS_AUTOIDLE);
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iommu_write_reg(obj, l, MMU_SYSCONFIG);
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iommu_write_reg(obj, pa, MMU_TTB);
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__iommu_set_twl(obj, true);
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return 0;
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}
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static void omap2_iommu_disable(struct omap_iommu *obj)
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{
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u32 l = iommu_read_reg(obj, MMU_CNTL);
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l &= ~MMU_CNTL_MASK;
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iommu_write_reg(obj, l, MMU_CNTL);
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iommu_write_reg(obj, MMU_SYS_IDLE_FORCE, MMU_SYSCONFIG);
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dev_dbg(obj->dev, "%s is shutting down\n", obj->name);
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}
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static void omap2_iommu_set_twl(struct omap_iommu *obj, bool on)
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{
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__iommu_set_twl(obj, false);
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}
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static u32 omap2_iommu_fault_isr(struct omap_iommu *obj, u32 *ra)
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{
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u32 stat, da;
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u32 errs = 0;
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stat = iommu_read_reg(obj, MMU_IRQSTATUS);
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stat &= MMU_IRQ_MASK;
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if (!stat) {
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*ra = 0;
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return 0;
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}
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da = iommu_read_reg(obj, MMU_FAULT_AD);
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*ra = da;
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if (stat & MMU_IRQ_TLBMISS)
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errs |= OMAP_IOMMU_ERR_TLB_MISS;
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if (stat & MMU_IRQ_TRANSLATIONFAULT)
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errs |= OMAP_IOMMU_ERR_TRANS_FAULT;
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if (stat & MMU_IRQ_EMUMISS)
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errs |= OMAP_IOMMU_ERR_EMU_MISS;
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if (stat & MMU_IRQ_TABLEWALKFAULT)
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errs |= OMAP_IOMMU_ERR_TBLWALK_FAULT;
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if (stat & MMU_IRQ_MULTIHITFAULT)
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errs |= OMAP_IOMMU_ERR_MULTIHIT_FAULT;
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iommu_write_reg(obj, stat, MMU_IRQSTATUS);
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return errs;
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}
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static void omap2_tlb_read_cr(struct omap_iommu *obj, struct cr_regs *cr)
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{
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cr->cam = iommu_read_reg(obj, MMU_READ_CAM);
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cr->ram = iommu_read_reg(obj, MMU_READ_RAM);
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}
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static void omap2_tlb_load_cr(struct omap_iommu *obj, struct cr_regs *cr)
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{
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iommu_write_reg(obj, cr->cam | MMU_CAM_V, MMU_CAM);
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iommu_write_reg(obj, cr->ram, MMU_RAM);
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}
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static u32 omap2_cr_to_virt(struct cr_regs *cr)
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{
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u32 page_size = cr->cam & MMU_CAM_PGSZ_MASK;
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u32 mask = get_cam_va_mask(cr->cam & page_size);
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return cr->cam & mask;
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}
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static struct cr_regs *omap2_alloc_cr(struct omap_iommu *obj,
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struct iotlb_entry *e)
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{
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struct cr_regs *cr;
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if (e->da & ~(get_cam_va_mask(e->pgsz))) {
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dev_err(obj->dev, "%s:\twrong alignment: %08x\n", __func__,
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e->da);
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return ERR_PTR(-EINVAL);
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}
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cr = kmalloc(sizeof(*cr), GFP_KERNEL);
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if (!cr)
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return ERR_PTR(-ENOMEM);
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cr->cam = (e->da & MMU_CAM_VATAG_MASK) | e->prsvd | e->pgsz | e->valid;
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cr->ram = e->pa | e->endian | e->elsz | e->mixed;
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return cr;
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}
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static inline int omap2_cr_valid(struct cr_regs *cr)
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{
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return cr->cam & MMU_CAM_V;
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}
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static u32 omap2_get_pte_attr(struct iotlb_entry *e)
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{
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u32 attr;
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attr = e->mixed << 5;
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attr |= e->endian;
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attr |= e->elsz >> 3;
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attr <<= (((e->pgsz == MMU_CAM_PGSZ_4K) ||
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(e->pgsz == MMU_CAM_PGSZ_64K)) ? 0 : 6);
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return attr;
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}
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static ssize_t
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omap2_dump_cr(struct omap_iommu *obj, struct cr_regs *cr, char *buf)
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{
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char *p = buf;
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/* FIXME: Need more detail analysis of cam/ram */
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p += sprintf(p, "%08x %08x %01x\n", cr->cam, cr->ram,
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(cr->cam & MMU_CAM_P) ? 1 : 0);
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return p - buf;
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}
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#define pr_reg(name) \
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do { \
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ssize_t bytes; \
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const char *str = "%20s: %08x\n"; \
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const int maxcol = 32; \
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bytes = snprintf(p, maxcol, str, __stringify(name), \
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iommu_read_reg(obj, MMU_##name)); \
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p += bytes; \
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len -= bytes; \
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if (len < maxcol) \
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goto out; \
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} while (0)
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static ssize_t
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omap2_iommu_dump_ctx(struct omap_iommu *obj, char *buf, ssize_t len)
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{
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char *p = buf;
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pr_reg(REVISION);
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pr_reg(SYSCONFIG);
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pr_reg(SYSSTATUS);
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pr_reg(IRQSTATUS);
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pr_reg(IRQENABLE);
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pr_reg(WALKING_ST);
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pr_reg(CNTL);
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pr_reg(FAULT_AD);
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pr_reg(TTB);
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pr_reg(LOCK);
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pr_reg(LD_TLB);
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pr_reg(CAM);
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pr_reg(RAM);
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pr_reg(GFLUSH);
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pr_reg(FLUSH_ENTRY);
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pr_reg(READ_CAM);
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pr_reg(READ_RAM);
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pr_reg(EMU_FAULT_AD);
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out:
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return p - buf;
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}
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static void omap2_iommu_save_ctx(struct omap_iommu *obj)
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{
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int i;
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u32 *p = obj->ctx;
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for (i = 0; i < (MMU_REG_SIZE / sizeof(u32)); i++) {
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p[i] = iommu_read_reg(obj, i * sizeof(u32));
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dev_dbg(obj->dev, "%s\t[%02d] %08x\n", __func__, i, p[i]);
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}
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BUG_ON(p[0] != IOMMU_ARCH_VERSION);
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}
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static void omap2_iommu_restore_ctx(struct omap_iommu *obj)
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{
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int i;
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u32 *p = obj->ctx;
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for (i = 0; i < (MMU_REG_SIZE / sizeof(u32)); i++) {
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iommu_write_reg(obj, p[i], i * sizeof(u32));
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dev_dbg(obj->dev, "%s\t[%02d] %08x\n", __func__, i, p[i]);
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}
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BUG_ON(p[0] != IOMMU_ARCH_VERSION);
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}
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static void omap2_cr_to_e(struct cr_regs *cr, struct iotlb_entry *e)
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{
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e->da = cr->cam & MMU_CAM_VATAG_MASK;
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e->pa = cr->ram & MMU_RAM_PADDR_MASK;
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e->valid = cr->cam & MMU_CAM_V;
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e->pgsz = cr->cam & MMU_CAM_PGSZ_MASK;
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e->endian = cr->ram & MMU_RAM_ENDIAN_MASK;
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e->elsz = cr->ram & MMU_RAM_ELSZ_MASK;
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e->mixed = cr->ram & MMU_RAM_MIXED;
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}
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static const struct iommu_functions omap2_iommu_ops = {
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.version = IOMMU_ARCH_VERSION,
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.enable = omap2_iommu_enable,
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.disable = omap2_iommu_disable,
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.set_twl = omap2_iommu_set_twl,
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.fault_isr = omap2_iommu_fault_isr,
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.tlb_read_cr = omap2_tlb_read_cr,
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.tlb_load_cr = omap2_tlb_load_cr,
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.cr_to_e = omap2_cr_to_e,
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.cr_to_virt = omap2_cr_to_virt,
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.alloc_cr = omap2_alloc_cr,
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.cr_valid = omap2_cr_valid,
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.dump_cr = omap2_dump_cr,
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.get_pte_attr = omap2_get_pte_attr,
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.save_ctx = omap2_iommu_save_ctx,
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.restore_ctx = omap2_iommu_restore_ctx,
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.dump_ctx = omap2_iommu_dump_ctx,
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};
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static int __init omap2_iommu_init(void)
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{
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return omap_install_iommu_arch(&omap2_iommu_ops);
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}
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module_init(omap2_iommu_init);
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static void __exit omap2_iommu_exit(void)
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{
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omap_uninstall_iommu_arch(&omap2_iommu_ops);
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}
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module_exit(omap2_iommu_exit);
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MODULE_AUTHOR("Hiroshi DOYU, Paul Mundt and Toshihiro Kobayashi");
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MODULE_DESCRIPTION("omap iommu: omap2/3 architecture specific functions");
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MODULE_LICENSE("GPL v2");
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