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path: root/drivers/parport
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2014-12-14Merge tag 'char-misc-3.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/g...Linus Torvalds
2014-12-14Merge tag 'driver-core-3.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel...Linus Torvalds
2014-11-26parport: parport_pc, do not remove parent devices earlyJiri Slaby
2014-11-06parport: Add support for the WCH382 2S/1P multi-IO cardSergej Pupykin
2014-10-20parport: drop owner assignment from platform_driversWolfram Sang
2014-09-23parport: parport_pc: Implement architecture and device check to cut off false...Matwey V. Kornilov
2014-09-23parport: parport_pc: Introduce intel_bug_present function.Matwey V. Kornilov
2014-08-08drivers/parport/parport_ip32.c: use PTR_ERR_OR_ZEROFabian Frederick
2014-07-25parport: fix menu breakageRandy Dunlap
2014-06-06parport: convert use of typedef ctl_table to struct ctl_tableJoe Perches
2014-05-28parport: Add support for the WCH353 1S/1P multi-IO cardEzequiel Garcia
2014-02-28parport: fix interruptible_sleep_on raceArnd Bergmann
2014-01-20Merge tag 'tty-3.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gre...Linus Torvalds
2014-01-20Merge tag 'char-misc-3.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/g...Linus Torvalds
2013-12-10parport: parport_pc: remove double PCI ID for NetMosSebastian Andrzej Siewior
2013-12-10parport_pc: remove unnecessary pci_set_drvdata()Jingoo Han
2013-12-10parport: parport_pc: fix id print of a deviceSebastian Andrzej Siewior
2013-12-08parport_serial: remove unnecessary pci_set_drvdata()Jingoo Han
2013-11-26zorro: ZTWO_VADDR() should return "void __iomem *"Geert Uytterhoeven
2013-11-15Merge tag 'for-linus' of git://linux-c6x.org/git/projects/linux-c6x-upstreamingLinus Torvalds
2013-11-15tree-wide: use reinit_completion instead of INIT_COMPLETIONWolfram Sang
2013-11-14Merge branch 'for-linus-dma-masks' of git://git.linaro.org/people/rmk/linux-armLinus Torvalds
2013-11-12Merge tag 'h8300-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/...Linus Torvalds
2013-10-31DMA-API: parport: parport_pc.c: use dma_coerce_mask_and_coherent()Russell King
2013-10-23Kconfig cleanup (PARPORT_PC dependencies)Mark Salter
2013-08-30drivers: parport: Kconfig: exclude h8300 for PARPORT_PCChen Gang
2013-08-27parport: amiga: remove unnecessary platform_set_drvdata()Jingoo Han
2013-07-03Merge branch 'akpm' (updates from Andrew Morton)Linus Torvalds
2013-07-03drivers/parport/share.c: use kzallocAlexandru Gheorghiu
2013-06-16parport: disable PC-style parallel port support on crisGeert Uytterhoeven
2013-06-01parisc: parport0: fix this legacy no-device port driver!Helge Deller
2013-06-01parport_pc: disable PARPORT_PC_SUPERIO on parisc architectureHelge Deller
2013-03-25parport: use kmemdup instead of kmalloc + memcpySilviu-Mihai Popescu
2013-03-25parport: amiga: use module_platform_driver_probe()Fabio Porcedda
2013-03-15drivers/parport: use module_pcmcia_driver() in pcmcia driversH Hartley Sweeten
2013-02-21Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s39...Linus Torvalds
2013-02-14parport: disable PC-style parallel port support for s390Heiko Carstens
2013-01-30serial/8250: Add suport for later SUNIX (TIMEDIA) boards.Stephen Chivers
2013-01-03Drivers: parport: remove __dev* attributes.Greg Kroah-Hartman
2012-11-15drivers/parport: remove depends on CONFIG_EXPERIMENTALKees Cook
2012-10-09Merge tag 'xtensa-next-20121008' of git://github.com/czankel/xtensa-linuxLinus Torvalds
2012-10-03parport: disable for xtensa archMax Filippov
2012-09-05parport: fix possible memory leak in parport_gsc_probe_port()Wei Yongjun
2012-09-05parport_serial: Add support for the WCH353 2S/1P multi-IO cardGuainluca Anzolin
2012-05-22Merge tag 'driver-core-3.5-rc1' of git://git.kernel.org/pub/scm/linux/kernel/...Linus Torvalds
2012-05-08parport: use KERN_CONT in printk() continuation linesKay Sievers
2012-04-20parport: remove unused dead code from lowlevel driversMatt Porter
2012-01-14Merge tag 'for-linus' of git://github.com/rustyrussell/linuxLinus Torvalds
2012-01-12drivers/parport/parport_pc.c: fix warningsAndrew Morton
2012-01-13module_param: make bool parameters really bool (drivers & misc)Rusty Russell
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/*
 * IOMMU API for MTK architected m4u v1 implementations
 *
 * Copyright (c) 2015-2016 MediaTek Inc.
 * Author: Honghui Zhang <honghui.zhang@mediatek.com>
 *
 * Based on driver/iommu/mtk_iommu.c
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */
#include <linux/memblock.h>
#include <linux/bug.h>
#include <linux/clk.h>
#include <linux/component.h>
#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <linux/dma-iommu.h>
#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/iommu.h>
#include <linux/iopoll.h>
#include <linux/list.h>
#include <linux/of_address.h>
#include <linux/of_iommu.h>
#include <linux/of_irq.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <asm/barrier.h>
#include <asm/dma-iommu.h>
#include <linux/init.h>
#include <dt-bindings/memory/mt2701-larb-port.h>
#include <soc/mediatek/smi.h>
#include "mtk_iommu.h"

#define REG_MMU_PT_BASE_ADDR			0x000

#define F_ALL_INVLD				0x2
#define F_MMU_INV_RANGE				0x1
#define F_INVLD_EN0				BIT(0)
#define F_INVLD_EN1				BIT(1)

#define F_MMU_FAULT_VA_MSK			0xfffff000
#define MTK_PROTECT_PA_ALIGN			128

#define REG_MMU_CTRL_REG			0x210
#define F_MMU_CTRL_COHERENT_EN			BIT(8)
#define REG_MMU_IVRP_PADDR			0x214
#define REG_MMU_INT_CONTROL			0x220
#define F_INT_TRANSLATION_FAULT			BIT(0)
#define F_INT_MAIN_MULTI_HIT_FAULT		BIT(1)
#define F_INT_INVALID_PA_FAULT			BIT(2)
#define F_INT_ENTRY_REPLACEMENT_FAULT		BIT(3)
#define F_INT_TABLE_WALK_FAULT			BIT(4)
#define F_INT_TLB_MISS_FAULT			BIT(5)
#define F_INT_PFH_DMA_FIFO_OVERFLOW		BIT(6)
#define F_INT_MISS_DMA_FIFO_OVERFLOW		BIT(7)

#define F_MMU_TF_PROTECT_SEL(prot)		(((prot) & 0x3) << 5)
#define F_INT_CLR_BIT				BIT(12)

#define REG_MMU_FAULT_ST			0x224
#define REG_MMU_FAULT_VA			0x228
#define REG_MMU_INVLD_PA			0x22C
#define REG_MMU_INT_ID				0x388
#define REG_MMU_INVALIDATE			0x5c0
#define REG_MMU_INVLD_START_A			0x5c4
#define REG_MMU_INVLD_END_A			0x5c8

#define REG_MMU_INV_SEL				0x5d8
#define REG_MMU_STANDARD_AXI_MODE		0x5e8

#define REG_MMU_DCM				0x5f0
#define F_MMU_DCM_ON				BIT(1)
#define REG_MMU_CPE_DONE			0x60c
#define F_DESC_VALID				0x2
#define F_DESC_NONSEC				BIT(3)
#define MT2701_M4U_TF_LARB(TF)			(6 - (((TF) >> 13) & 0x7))
#define MT2701_M4U_TF_PORT(TF)			(((TF) >> 8) & 0xF)
/* MTK generation one iommu HW only support 4K size mapping */
#define MT2701_IOMMU_PAGE_SHIFT			12
#define MT2701_IOMMU_PAGE_SIZE			(1UL << MT2701_IOMMU_PAGE_SHIFT)

/*
 * MTK m4u support 4GB iova address space, and only support 4K page
 * mapping. So the pagetable size should be exactly as 4M.
 */
#define M2701_IOMMU_PGT_SIZE			SZ_4M

struct mtk_iommu_domain {
	spinlock_t			pgtlock; /* lock for page table */
	struct iommu_domain		domain;
	u32				*pgt_va;
	dma_addr_t			pgt_pa;
	struct mtk_iommu_data		*data;
};

static struct mtk_iommu_domain *to_mtk_domain(struct iommu_domain *dom)
{
	return container_of(dom, struct mtk_iommu_domain, domain);
}

static const int mt2701_m4u_in_larb[] = {
	LARB0_PORT_OFFSET, LARB1_PORT_OFFSET,
	LARB2_PORT_OFFSET, LARB3_PORT_OFFSET
};

static inline int mt2701_m4u_to_larb(int id)
{
	int i;

	for (i = ARRAY_SIZE(mt2701_m4u_in_larb) - 1; i >= 0; i--)
		if ((id) >= mt2701_m4u_in_larb[i])
			return i;

	return 0;
}

static inline int mt2701_m4u_to_port(int id)
{
	int larb = mt2701_m4u_to_larb(id);

	return id - mt2701_m4u_in_larb[larb];
}

static void mtk_iommu_tlb_flush_all(struct mtk_iommu_data *data)
{
	writel_relaxed(F_INVLD_EN1 | F_INVLD_EN0,
			data->base + REG_MMU_INV_SEL);
	writel_relaxed(F_ALL_INVLD, data->base + REG_MMU_INVALIDATE);
	wmb(); /* Make sure the tlb flush all done */
}

static void mtk_iommu_tlb_flush_range(struct mtk_iommu_data *data,
				unsigned long iova, size_t size)
{
	int ret;
	u32 tmp;

	writel_relaxed(F_INVLD_EN1 | F_INVLD_EN0,
		data->base + REG_MMU_INV_SEL);
	writel_relaxed(iova & F_MMU_FAULT_VA_MSK,
		data->base + REG_MMU_INVLD_START_A);
	writel_relaxed((iova + size - 1) & F_MMU_FAULT_VA_MSK,
		data->base + REG_MMU_INVLD_END_A);
	writel_relaxed(F_MMU_INV_RANGE, data->base + REG_MMU_INVALIDATE);

	ret = readl_poll_timeout_atomic(data->base + REG_MMU_CPE_DONE,
				tmp, tmp != 0, 10, 100000);
	if (ret) {
		dev_warn(data->dev,
			 "Partial TLB flush timed out, falling back to full flush\n");
		mtk_iommu_tlb_flush_all(data);
	}
	/* Clear the CPE status */
	writel_relaxed(0, data->base + REG_MMU_CPE_DONE);
}

static irqreturn_t mtk_iommu_isr(int irq, void *dev_id)
{
	struct mtk_iommu_data *data = dev_id;
	struct mtk_iommu_domain *dom = data->m4u_dom;
	u32 int_state, regval, fault_iova, fault_pa;
	unsigned int fault_larb, fault_port;

	/* Read error information from registers */
	int_state = readl_relaxed(data->base + REG_MMU_FAULT_ST);
	fault_iova = readl_relaxed(data->base + REG_MMU_FAULT_VA);

	fault_iova &= F_MMU_FAULT_VA_MSK;
	fault_pa = readl_relaxed(data->base + REG_MMU_INVLD_PA);
	regval = readl_relaxed(data->base + REG_MMU_INT_ID);
	fault_larb = MT2701_M4U_TF_LARB(regval);
	fault_port = MT2701_M4U_TF_PORT(regval);

	/*
	 * MTK v1 iommu HW could not determine whether the fault is read or
	 * write fault, report as read fault.
	 */
	if (report_iommu_fault(&dom->domain, data->dev, fault_iova,
			IOMMU_FAULT_READ))
		dev_err_ratelimited(data->dev,
			"fault type=0x%x iova=0x%x pa=0x%x larb=%d port=%d\n",
			int_state, fault_iova, fault_pa,
			fault_larb, fault_port);

	/* Interrupt clear */
	regval = readl_relaxed(data->base + REG_MMU_INT_CONTROL);
	regval |= F_INT_CLR_BIT;
	writel_relaxed(regval, data->base + REG_MMU_INT_CONTROL);

	mtk_iommu_tlb_flush_all(data);

	return IRQ_HANDLED;
}

static void mtk_iommu_config(struct mtk_iommu_data *data,
			     struct device *dev, bool enable)
{
	struct mtk_smi_larb_iommu    *larb_mmu;
	unsigned int                 larbid, portid;
	struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
	int i;

	for (i = 0; i < fwspec->num_ids; ++i) {
		larbid = mt2701_m4u_to_larb(fwspec->ids[i]);
		portid = mt2701_m4u_to_port(fwspec->ids[i]);
		larb_mmu = &data->smi_imu.larb_imu[larbid];

		dev_dbg(dev, "%s iommu port: %d\n",
			enable ? "enable" : "disable", portid);

		if (enable)
			larb_mmu->mmu |= MTK_SMI_MMU_EN(portid);
		else
			larb_mmu->mmu &= ~MTK_SMI_MMU_EN(portid);
	}
}

static int mtk_iommu_domain_finalise(struct mtk_iommu_data *data)
{
	struct mtk_iommu_domain *dom = data->m4u_dom;

	spin_lock_init(&dom->pgtlock);

	dom->pgt_va = dma_alloc_coherent(data->dev, M2701_IOMMU_PGT_SIZE,
					 &dom->pgt_pa, GFP_KERNEL);
	if (!dom->pgt_va)
		r