ddfa975a8c
In order to enable TLB miss interrupt, the TWL should be disabled. This patch provides the functionality to get the MMU fault interrupt for a TLB miss in the cases where the users are working with the locked TLB entries and with TWL disabled. New interface is added to select twl and to enable TLB miss interrupt. Signed-off-by: Hari Kanigeri <h-kanigeri2@ti.com> Signed-off-by: Ramesh Gupta <grgupta@ti.com> Signed-off-by: Hiroshi Doyu <Hiroshi.DOYU@nokia.com>
362 lines
8.4 KiB
C
362 lines
8.4 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 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 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 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 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 iommu *obj, u32 *ra)
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{
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int i;
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u32 stat, da;
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const char *err_msg[] = {
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"tlb miss",
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"translation fault",
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"emulation miss",
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"table walk fault",
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"multi hit fault",
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};
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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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return 0;
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da = iommu_read_reg(obj, MMU_FAULT_AD);
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*ra = da;
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dev_err(obj->dev, "%s:\tda:%08x ", __func__, da);
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for (i = 0; i < ARRAY_SIZE(err_msg); i++) {
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if (stat & (1 << i))
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printk("%s ", err_msg[i]);
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}
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printk("\n");
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iommu_write_reg(obj, stat, MMU_IRQSTATUS);
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omap2_iommu_disable(obj);
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return stat;
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}
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static void omap2_tlb_read_cr(struct 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 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 iommu *obj, 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) ? 0 : 6);
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return attr;
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}
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static ssize_t omap2_dump_cr(struct 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 omap2_iommu_dump_ctx(struct 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 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 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 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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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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