linux-kernel - [PATCH v3 27/33] iommu/mediatek: Initialise bank HW for each a bank

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Date:   Thu, 23 Sep 2021 19:58:34 +0800
From:   Yong Wu <yong.wu@...iatek.com>
To:     Joerg Roedel <joro@...tes.org>, Rob Herring <robh+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>
CC:     Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Tomasz Figa <tfiga@...omium.org>,
        <linux-mediatek@...ts.infradead.org>,
        <srv_heupstream@...iatek.com>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <iommu@...ts.linux-foundation.org>,
        Hsin-Yi Wang <hsinyi@...omium.org>, <yong.wu@...iatek.com>,
        <youlin.pei@...iatek.com>, <anan.sun@...iatek.com>,
        <chao.hao@...iatek.com>, <yen-chang.chen@...iatek.com>
Subject: [PATCH v3 27/33] iommu/mediatek: Initialise bank HW for each a bank

The mt8195 IOMMU HW max support 5 banks, and regarding the banks'
registers, it looks like:

 ----------------------------------------
 |bank0  | bank1 | bank2 | bank3 | bank4|
 ----------------------------------------
 |global |
 |control|         null
 |regs   |
 -----------------------------------------
 |bank   |bank   |bank   |bank   |bank   |
 |regs   |regs   |regs   |regs   |regs   |
 |       |       |       |       |       |
 -----------------------------------------

Each bank has some special bank registers and it share bank0's global
control registers. this patch initialise the bank hw with the bankid.

In the hw_init, we always initialise bank0's control register since
we don't know if the bank0 is initialised.

Additionally, About each bank's register base, always delta 0x1000.
like bank[x + 1] = bank[x] + 0x1000.

Signed-off-by: Yong Wu <yong.wu@...iatek.com>
---
 drivers/iommu/mtk_iommu.c | 28 +++++++++++++++++-----------
 1 file changed, 17 insertions(+), 11 deletions(-)

diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
index 6ef3eb3cad92..c139675d99e6 100644
--- a/drivers/iommu/mtk_iommu.c
+++ b/drivers/iommu/mtk_iommu.c
@@ -152,7 +152,7 @@ struct mtk_iommu_domain {
 
 static const struct iommu_ops mtk_iommu_ops;
 
-static int mtk_iommu_hw_init(const struct mtk_iommu_data *data);
+static int mtk_iommu_hw_init(const struct mtk_iommu_data *data, unsigned int bankid);
 
 #define MTK_IOMMU_TLB_ADDR(iova) ({					\
 	dma_addr_t _addr = iova;					\
@@ -520,12 +520,12 @@ static int mtk_iommu_attach_device(struct iommu_domain *domain,
 		dom->bank = bank;
 	}
 
-	if (!bank->m4u_dom) { /* Initialize the M4U HW */
+	if (!bank->m4u_dom) { /* Initialize the M4U HW for each a BANK */
 		ret = pm_runtime_resume_and_get(m4udev);
 		if (ret < 0)
 			return ret;
 
-		ret = mtk_iommu_hw_init(data);
+		ret = mtk_iommu_hw_init(data, bankid);
 		if (ret) {
 			pm_runtime_put(m4udev);
 			return ret;
@@ -729,11 +729,16 @@ static const struct iommu_ops mtk_iommu_ops = {
 	.owner		= THIS_MODULE,
 };
 
-static int mtk_iommu_hw_init(const struct mtk_iommu_data *data)
+static int mtk_iommu_hw_init(const struct mtk_iommu_data *data, unsigned int bankid)
 {
+	const struct mtk_iommu_bank_data *bankx = &data->bank[bankid];
 	const struct mtk_iommu_bank_data *bank0 = &data->bank[0];
 	u32 regval;
 
+	/*
+	 * Global control settings are in bank0. May re-init these global registers
+	 * since no sure if there is bank0 consumers.
+	 */
 	if (data->plat_data->m4u_plat == M4U_MT8173) {
 		regval = F_MMU_PREFETCH_RT_REPLACE_MOD |
 			 F_MMU_TF_PROT_TO_PROGRAM_ADDR_MT8173;
@@ -776,13 +781,14 @@ static int mtk_iommu_hw_init(const struct mtk_iommu_data *data)
 	}
 	writel_relaxed(regval, bank0->base + REG_MMU_MISC_CTRL);
 
+	/* Independent settings for each bank */
 	regval = F_L2_MULIT_HIT_EN |
 		F_TABLE_WALK_FAULT_INT_EN |
 		F_PREETCH_FIFO_OVERFLOW_INT_EN |
 		F_MISS_FIFO_OVERFLOW_INT_EN |
 		F_PREFETCH_FIFO_ERR_INT_EN |
 		F_MISS_FIFO_ERR_INT_EN;
-	writel_relaxed(regval, bank0->base + REG_MMU_INT_CONTROL0);
+	writel_relaxed(regval, bankx->base + REG_MMU_INT_CONTROL0);
 
 	regval = F_INT_TRANSLATION_FAULT |
 		F_INT_MAIN_MULTI_HIT_FAULT |
@@ -791,19 +797,19 @@ static int mtk_iommu_hw_init(const struct mtk_iommu_data *data)
 		F_INT_TLB_MISS_FAULT |
 		F_INT_MISS_TRANSACTION_FIFO_FAULT |
 		F_INT_PRETETCH_TRANSATION_FIFO_FAULT;
-	writel_relaxed(regval, bank0->base + REG_MMU_INT_MAIN_CONTROL);
+	writel_relaxed(regval, bankx->base + REG_MMU_INT_MAIN_CONTROL);
 
 	if (MTK_IOMMU_HAS_FLAG(data->plat_data, HAS_LEGACY_IVRP_PADDR))
 		regval = (data->protect_base >> 1) | (data->enable_4GB << 31);
 	else
 		regval = lower_32_bits(data->protect_base) |
 			 upper_32_bits(data->protect_base);
-	writel_relaxed(regval, bank0->base + REG_MMU_IVRP_PADDR);
+	writel_relaxed(regval, bankx->base + REG_MMU_IVRP_PADDR);
 
-	if (devm_request_irq(bank0->pdev, bank0->irq, mtk_iommu_isr, 0,
-			     dev_name(bank0->pdev), (void *)bank0)) {
-		writel_relaxed(0, bank0->base + REG_MMU_PT_BASE_ADDR);
-		dev_err(bank0->pdev, "Failed @ IRQ-%d Request\n", bank0->irq);
+	if (devm_request_irq(bankx->pdev, bankx->irq, mtk_iommu_isr, 0,
+			     dev_name(bankx->pdev), (void *)bankx)) {
+		writel_relaxed(0, bankx->base + REG_MMU_PT_BASE_ADDR);
+		dev_err(bankx->pdev, "Failed @ IRQ-%d Request\n", bankx->irq);
 		return -ENODEV;
 	}
 
-- 
2.18.0