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Subject[PATCH 19/24] iommu/mediatek: Initialise bank HW for each a bank
Date
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@mediatek.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 78c458bb8cc8..ed3cf75850ce 100644
--- a/drivers/iommu/mtk_iommu.c
+++ b/drivers/iommu/mtk_iommu.c
@@ -154,7 +154,7 @@ 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; \
@@ -523,12 +523,12 @@ 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;
@@ -737,11 +737,16 @@ 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 setting is 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;
@@ -784,13 +789,14 @@ static int mtk_iommu_hw_init(const struct mtk_iommu_data *data)
}
writel_relaxed(regval, bank0->base + REG_MMU_MISC_CTRL);

+ /* independent setting 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 |
@@ -799,19 +805,19 @@ 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
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