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Message-ID: <20241205145859.2331691-3-mkumard@nvidia.com>
Date: Thu, 5 Dec 2024 20:28:59 +0530
From: Mohan Kumar D <mkumard@...dia.com>
To: <vkoul@...nel.org>, <robh@...nel.org>, <krzk+dt@...nel.org>,
<conor+dt@...nel.org>
CC: <thierry.reding@...il.com>, <jonathanh@...dia.com>, <spujar@...dia.com>,
<dmaengine@...r.kernel.org>, <devicetree@...r.kernel.org>,
<linux-tegra@...r.kernel.org>, <linux-kernel@...r.kernel.org>, Mohan Kumar D
<mkumard@...dia.com>
Subject: [PATCH 2/2] dmaengine: tegra210-adma: Support channel page
Multiple ADMA Channel page hardware support has been
added from TEGRA186 and onwards.
- Add support in the tegra adma driver to handle selective
channel page usage
- Make global register programming optional
Signed-off-by: Mohan Kumar D <mkumard@...dia.com>
---
drivers/dma/tegra210-adma.c | 86 ++++++++++++++++++++++++++++++++-----
1 file changed, 76 insertions(+), 10 deletions(-)
diff --git a/drivers/dma/tegra210-adma.c b/drivers/dma/tegra210-adma.c
index 2953008d42ef..6896da8ac7ef 100644
--- a/drivers/dma/tegra210-adma.c
+++ b/drivers/dma/tegra210-adma.c
@@ -43,6 +43,10 @@
#define ADMA_CH_CONFIG_MAX_BUFS 8
#define TEGRA186_ADMA_CH_CONFIG_OUTSTANDING_REQS(reqs) (reqs << 4)
+#define TEGRA186_ADMA_GLOBAL_PAGE_CHGRP 0x30
+#define TEGRA186_ADMA_GLOBAL_PAGE_RX_REQ 0x70
+#define TEGRA186_ADMA_GLOBAL_PAGE_TX_REQ 0x84
+
#define ADMA_CH_FIFO_CTRL 0x2c
#define ADMA_CH_TX_FIFO_SIZE_SHIFT 8
#define ADMA_CH_RX_FIFO_SIZE_SHIFT 0
@@ -96,6 +100,7 @@ struct tegra_adma_chip_data {
unsigned int ch_fifo_size_mask;
unsigned int sreq_index_offset;
bool has_outstanding_reqs;
+ void (*set_global_pg_config)(struct tegra_adma *tdma);
};
/*
@@ -151,6 +156,7 @@ struct tegra_adma {
struct dma_device dma_dev;
struct device *dev;
void __iomem *base_addr;
+ void __iomem *ch_base_addr;
struct clk *ahub_clk;
unsigned int nr_channels;
unsigned long *dma_chan_mask;
@@ -159,6 +165,7 @@ struct tegra_adma {
/* Used to store global command register state when suspending */
unsigned int global_cmd;
+ unsigned int ch_page_no;
const struct tegra_adma_chip_data *cdata;
@@ -176,6 +183,11 @@ static inline u32 tdma_read(struct tegra_adma *tdma, u32 reg)
return readl(tdma->base_addr + tdma->cdata->global_reg_offset + reg);
}
+static inline void tdma_ch_global_write(struct tegra_adma *tdma, u32 reg, u32 val)
+{
+ writel(val, tdma->ch_base_addr + tdma->cdata->global_reg_offset + reg);
+}
+
static inline void tdma_ch_write(struct tegra_adma_chan *tdc, u32 reg, u32 val)
{
writel(val, tdc->chan_addr + reg);
@@ -217,13 +229,30 @@ static int tegra_adma_slave_config(struct dma_chan *dc,
return 0;
}
+static void tegra186_adma_global_page_config(struct tegra_adma *tdma)
+{
+ /*
+ * Clear the default page1 channel group configs and program
+ * the global registers based on the actual page usage
+ */
+ tdma_write(tdma, TEGRA186_ADMA_GLOBAL_PAGE_CHGRP, 0);
+ tdma_write(tdma, TEGRA186_ADMA_GLOBAL_PAGE_RX_REQ, 0);
+ tdma_write(tdma, TEGRA186_ADMA_GLOBAL_PAGE_TX_REQ, 0);
+ tdma_write(tdma, TEGRA186_ADMA_GLOBAL_PAGE_CHGRP + (tdma->ch_page_no * 0x4), 0xff);
+ tdma_write(tdma, TEGRA186_ADMA_GLOBAL_PAGE_RX_REQ + (tdma->ch_page_no * 0x4), 0x1ffffff);
+ tdma_write(tdma, TEGRA186_ADMA_GLOBAL_PAGE_TX_REQ + (tdma->ch_page_no * 0x4), 0xffffff);
+}
+
static int tegra_adma_init(struct tegra_adma *tdma)
{
u32 status;
int ret;
- /* Clear any interrupts */
- tdma_write(tdma, tdma->cdata->ch_base_offset + tdma->cdata->global_int_clear, 0x1);
+ /* Clear any channels group global interrupts */
+ tdma_ch_global_write(tdma, tdma->cdata->global_int_clear, 0x1);
+
+ if (!tdma->base_addr)
+ return 0;
/* Assert soft reset */
tdma_write(tdma, ADMA_GLOBAL_SOFT_RESET, 0x1);
@@ -237,6 +266,9 @@ static int tegra_adma_init(struct tegra_adma *tdma)
if (ret)
return ret;
+ if (tdma->cdata->set_global_pg_config)
+ tdma->cdata->set_global_pg_config(tdma);
+
/* Enable global ADMA registers */
tdma_write(tdma, ADMA_GLOBAL_CMD, 1);
@@ -736,7 +768,9 @@ static int __maybe_unused tegra_adma_runtime_suspend(struct device *dev)
struct tegra_adma_chan *tdc;
int i;
- tdma->global_cmd = tdma_read(tdma, ADMA_GLOBAL_CMD);
+ if (tdma->base_addr)
+ tdma->global_cmd = tdma_read(tdma, ADMA_GLOBAL_CMD);
+
if (!tdma->global_cmd)
goto clk_disable;
@@ -777,7 +811,11 @@ static int __maybe_unused tegra_adma_runtime_resume(struct device *dev)
dev_err(dev, "ahub clk_enable failed: %d\n", ret);
return ret;
}
- tdma_write(tdma, ADMA_GLOBAL_CMD, tdma->global_cmd);
+ if (tdma->base_addr) {
+ tdma_write(tdma, ADMA_GLOBAL_CMD, tdma->global_cmd);
+ if (tdma->cdata->set_global_pg_config)
+ tdma->cdata->set_global_pg_config(tdma);
+ }
if (!tdma->global_cmd)
return 0;
@@ -817,6 +855,7 @@ static const struct tegra_adma_chip_data tegra210_chip_data = {
.ch_fifo_size_mask = 0xf,
.sreq_index_offset = 2,
.has_outstanding_reqs = false,
+ .set_global_pg_config = NULL,
};
static const struct tegra_adma_chip_data tegra186_chip_data = {
@@ -833,6 +872,7 @@ static const struct tegra_adma_chip_data tegra186_chip_data = {
.ch_fifo_size_mask = 0x1f,
.sreq_index_offset = 4,
.has_outstanding_reqs = true,
+ .set_global_pg_config = tegra186_adma_global_page_config,
};
static const struct of_device_id tegra_adma_of_match[] = {
@@ -846,7 +886,8 @@ static int tegra_adma_probe(struct platform_device *pdev)
{
const struct tegra_adma_chip_data *cdata;
struct tegra_adma *tdma;
- int ret, i;
+ struct resource *res_page, *res_base;
+ int ret, i, page_no;
cdata = of_device_get_match_data(&pdev->dev);
if (!cdata) {
@@ -865,9 +906,35 @@ static int tegra_adma_probe(struct platform_device *pdev)
tdma->nr_channels = cdata->nr_channels;
platform_set_drvdata(pdev, tdma);
- tdma->base_addr = devm_platform_ioremap_resource(pdev, 0);
- if (IS_ERR(tdma->base_addr))
- return PTR_ERR(tdma->base_addr);
+ res_page = platform_get_resource_byname(pdev, IORESOURCE_MEM, "page");
+ if (res_page) {
+ tdma->ch_base_addr = devm_ioremap_resource(&pdev->dev, res_page);
+ if (IS_ERR(tdma->ch_base_addr))
+ return PTR_ERR(tdma->ch_base_addr);
+
+ res_base = platform_get_resource_byname(pdev, IORESOURCE_MEM, "global");
+ if (res_base) {
+ page_no = (res_page->start - res_base->start) / cdata->ch_base_offset;
+ if (page_no <= 0)
+ return -EINVAL;
+ tdma->ch_page_no = page_no - 1;
+ tdma->base_addr = devm_ioremap_resource(&pdev->dev, res_base);
+ if (IS_ERR(tdma->base_addr))
+ return PTR_ERR(tdma->base_addr);
+ }
+ } else {
+ /* If no 'page' property found, then reg DT binding would be legacy */
+ res_base = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (res_base) {
+ tdma->base_addr = devm_ioremap_resource(&pdev->dev, res_base);
+ if (IS_ERR(tdma->base_addr))
+ return PTR_ERR(tdma->base_addr);
+ } else {
+ return -ENODEV;
+ }
+
+ tdma->ch_base_addr = tdma->base_addr + cdata->ch_base_offset;
+ }
tdma->ahub_clk = devm_clk_get(&pdev->dev, "d_audio");
if (IS_ERR(tdma->ahub_clk)) {
@@ -900,8 +967,7 @@ static int tegra_adma_probe(struct platform_device *pdev)
if (!test_bit(i, tdma->dma_chan_mask))
continue;
- tdc->chan_addr = tdma->base_addr + cdata->ch_base_offset
- + (cdata->ch_reg_size * i);
+ tdc->chan_addr = tdma->ch_base_addr + (cdata->ch_reg_size * i);
tdc->irq = of_irq_get(pdev->dev.of_node, i);
if (tdc->irq <= 0) {
--
2.25.1
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