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Date: Thu, 17 Mar 2022 06:50:05 +0530
From: Krishna Yarlagadda <kyarlagadda@...dia.com>
To: <broonie@...nel.org>, <thierry.reding@...il.com>,
<jonathanh@...dia.com>, <linux-spi@...r.kernel.org>,
<linux-tegra@...r.kernel.org>, <ashishsingha@...dia.com>
CC: <skomatineni@...dia.com>, <ldewangan@...dia.com>,
<robh+dt@...nel.org>, <devicetree@...r.kernel.org>,
<linux-kernel@...r.kernel.org>,
"Krishna Yarlagadda" <kyarlagadda@...dia.com>
Subject: [PATCH 2/3] spi: tegra210-quad: Add wait polling support
Controller can poll for wait state inserted by TPM device and
handle it.
Signed-off-by: Krishna Yarlagadda <kyarlagadda@...dia.com>
---
drivers/spi/spi-tegra210-quad.c | 31 +++++++++++++++++++++++++++++++
1 file changed, 31 insertions(+)
diff --git a/drivers/spi/spi-tegra210-quad.c b/drivers/spi/spi-tegra210-quad.c
index a2e225e8f7f0..ecf171bfcdce 100644
--- a/drivers/spi/spi-tegra210-quad.c
+++ b/drivers/spi/spi-tegra210-quad.c
@@ -142,6 +142,7 @@
#define QSPI_GLOBAL_CONFIG 0X1a4
#define QSPI_CMB_SEQ_EN BIT(0)
+#define QSPI_TPM_WAIT_POLL_EN BIT(1)
#define QSPI_CMB_SEQ_ADDR 0x1a8
#define QSPI_ADDRESS_VALUE_SET(X) (((x) & 0xFFFF) << 0)
@@ -165,11 +166,13 @@ struct tegra_qspi_soc_data {
bool has_dma;
bool cmb_xfer_capable;
bool cs_count;
+ bool has_wait_polling;
};
struct tegra_qspi_client_data {
int tx_clk_tap_delay;
int rx_clk_tap_delay;
+ bool wait_polling;
};
struct tegra_qspi {
@@ -833,6 +836,11 @@ static u32 tegra_qspi_setup_transfer_one(struct spi_device *spi, struct spi_tran
else
command1 |= QSPI_CONTROL_MODE_0;
+ if (tqspi->soc_data->cmb_xfer_capable)
+ command1 &= ~QSPI_CS_SW_HW;
+ else
+ command1 |= QSPI_CS_SW_HW;
+
if (spi->mode & SPI_CS_HIGH)
command1 |= QSPI_CS_SW_VAL;
else
@@ -917,6 +925,7 @@ static int tegra_qspi_start_transfer_one(struct spi_device *spi,
static struct tegra_qspi_client_data *tegra_qspi_parse_cdata_dt(struct spi_device *spi)
{
+ struct tegra_qspi *tqspi = spi_master_get_devdata(spi->master);
struct tegra_qspi_client_data *cdata;
cdata = devm_kzalloc(&spi->dev, sizeof(*cdata), GFP_KERNEL);
@@ -927,6 +936,11 @@ static struct tegra_qspi_client_data *tegra_qspi_parse_cdata_dt(struct spi_devic
&cdata->tx_clk_tap_delay);
device_property_read_u32(&spi->dev, "nvidia,rx-clk-tap-delay",
&cdata->rx_clk_tap_delay);
+ if (tqspi->soc_data->has_wait_polling)
+ cdata->wait_polling = device_property_read_bool
+ (&spi->dev,
+ "nvidia,wait-polling");
+
return cdata;
}
@@ -1049,6 +1063,7 @@ static int tegra_qspi_combined_seq_xfer(struct tegra_qspi *tqspi,
bool is_first_msg = true;
struct spi_transfer *xfer;
struct spi_device *spi = msg->spi;
+ struct tegra_qspi_client_data *cdata = spi->controller_data;
u8 transfer_phase = 0;
u32 cmd1 = 0, dma_ctl = 0;
int ret = 0;
@@ -1059,6 +1074,10 @@ static int tegra_qspi_combined_seq_xfer(struct tegra_qspi *tqspi,
/* Enable Combined sequence mode */
val = tegra_qspi_readl(tqspi, QSPI_GLOBAL_CONFIG);
val |= QSPI_CMB_SEQ_EN;
+ if (cdata->wait_polling)
+ val |= QSPI_TPM_WAIT_POLL_EN;
+ else
+ val &= ~QSPI_TPM_WAIT_POLL_EN;
tegra_qspi_writel(tqspi, val, QSPI_GLOBAL_CONFIG);
/* Process individual transfer list */
list_for_each_entry(xfer, &msg->transfers, transfer_list) {
@@ -1158,6 +1177,8 @@ static int tegra_qspi_combined_seq_xfer(struct tegra_qspi *tqspi,
transfer_phase++;
}
+ ret = 0;
+
exit:
msg->status = ret;
@@ -1180,6 +1201,7 @@ static int tegra_qspi_non_combined_seq_xfer(struct tegra_qspi *tqspi,
/* Disable Combined sequence mode */
val = tegra_qspi_readl(tqspi, QSPI_GLOBAL_CONFIG);
val &= ~QSPI_CMB_SEQ_EN;
+ val &= ~QSPI_TPM_WAIT_POLL_EN;
tegra_qspi_writel(tqspi, val, QSPI_GLOBAL_CONFIG);
list_for_each_entry(transfer, &msg->transfers, transfer_list) {
struct spi_transfer *xfer = transfer;
@@ -1439,24 +1461,28 @@ static struct tegra_qspi_soc_data tegra210_qspi_soc_data = {
.has_dma = true,
.cmb_xfer_capable = false,
.cs_count = 1,
+ .has_wait_polling = false,
};
static struct tegra_qspi_soc_data tegra186_qspi_soc_data = {
.has_dma = true,
.cmb_xfer_capable = true,
.cs_count = 1,
+ .has_wait_polling = false,
};
static struct tegra_qspi_soc_data tegra234_qspi_soc_data = {
.has_dma = false,
.cmb_xfer_capable = true,
.cs_count = 1,
+ .has_wait_polling = true,
};
static struct tegra_qspi_soc_data tegra_grace_qspi_soc_data = {
.has_dma = false,
.cmb_xfer_capable = true,
.cs_count = 4,
+ .has_wait_polling = true,
};
static const struct of_device_id tegra_qspi_of_match[] = {
@@ -1509,6 +1535,7 @@ static int tegra_qspi_probe(struct platform_device *pdev)
struct resource *r;
int ret, qspi_irq;
int bus_num;
+ u8 val = 0;
master = devm_spi_alloc_master(&pdev->dev, sizeof(*tqspi));
if (!master)
@@ -1585,6 +1612,10 @@ static int tegra_qspi_probe(struct platform_device *pdev)
tqspi->spi_cs_timing1 = tegra_qspi_readl(tqspi, QSPI_CS_TIMING1);
tqspi->spi_cs_timing2 = tegra_qspi_readl(tqspi, QSPI_CS_TIMING2);
tqspi->def_command2_reg = tegra_qspi_readl(tqspi, QSPI_COMMAND2);
+ val = tegra_qspi_readl(tqspi, QSPI_GLOBAL_CONFIG);
+ val &= ~QSPI_CMB_SEQ_EN;
+ val &= ~QSPI_TPM_WAIT_POLL_EN;
+ tegra_qspi_writel(tqspi, val, QSPI_GLOBAL_CONFIG);
pm_runtime_put(&pdev->dev);
--
2.17.1
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