lkml.org 
[lkml]   [2022]   [Mar]   [7]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH V3 3/7] spi: mediatek: add MT7986 single mode design support
Date
this patch add the support of MT7986 single mode design.

Signed-off-by: Leilk Liu <leilk.liu@mediatek.com>
---
drivers/spi/spi-mt65xx.c | 102 +++++++++++++++++++++++++++++++++------
1 file changed, 87 insertions(+), 15 deletions(-)

diff --git a/drivers/spi/spi-mt65xx.c b/drivers/spi/spi-mt65xx.c
index 3fd89548ec3c..aa282cace7db 100644
--- a/drivers/spi/spi-mt65xx.c
+++ b/drivers/spi/spi-mt65xx.c
@@ -31,6 +31,7 @@
#define SPI_CFG2_REG 0x0028
#define SPI_TX_SRC_REG_64 0x002c
#define SPI_RX_DST_REG_64 0x0030
+#define SPI_CFG3_IPM_REG 0x0040

#define SPI_CFG0_SCK_HIGH_OFFSET 0
#define SPI_CFG0_SCK_LOW_OFFSET 8
@@ -51,6 +52,7 @@
#define SPI_CFG1_CS_IDLE_MASK 0xff
#define SPI_CFG1_PACKET_LOOP_MASK 0xff00
#define SPI_CFG1_PACKET_LENGTH_MASK 0x3ff0000
+#define SPI_CFG1_IPM_PACKET_LENGTH_MASK GENMASK(31, 16)
#define SPI_CFG2_SCK_HIGH_OFFSET 0
#define SPI_CFG2_SCK_LOW_OFFSET 16

@@ -71,7 +73,13 @@
#define SPI_CMD_TX_ENDIAN BIT(15)
#define SPI_CMD_FINISH_IE BIT(16)
#define SPI_CMD_PAUSE_IE BIT(17)
+#define SPI_CMD_IPM_NONIDLE_MODE BIT(19)
+#define SPI_CMD_IPM_SPIM_LOOP BIT(21)
+#define SPI_CMD_IPM_GET_TICKDLY_OFFSET 22

+#define SPI_CMD_IPM_GET_TICKDLY_MASK GENMASK(24, 22)
+#define SPI_CFG3_IPM_HALF_DUPLEX_DIR BIT(2)
+#define SPI_CFG3_IPM_HALF_DUPLEX_EN BIT(3)
#define MT8173_SPI_MAX_PAD_SEL 3

#define MTK_SPI_PAUSE_INT_STATUS 0x2
@@ -81,6 +89,7 @@

#define MTK_SPI_MAX_FIFO_SIZE 32U
#define MTK_SPI_PACKET_SIZE 1024
+#define MTK_SPI_IPM_PACKET_SIZE SZ_64K
#define MTK_SPI_32BITS_MASK (0xffffffff)

#define DMA_ADDR_EXT_BITS (36)
@@ -96,6 +105,9 @@ struct mtk_spi_compatible {
bool dma_ext;
/* some IC no need unprepare SPI clk */
bool no_need_unprepare;
+ /* IPM design improve some single mode features */
+ bool ipm_design;
+
};

struct mtk_spi {
@@ -119,6 +131,12 @@ static const struct mtk_spi_compatible mt2712_compat = {
.must_tx = true,
};

+static const struct mtk_spi_compatible mt7986_compat_single = {
+ .enhance_timing = true,
+ .dma_ext = true,
+ .ipm_design = true,
+};
+
static const struct mtk_spi_compatible mt6765_compat = {
.need_pad_sel = true,
.must_tx = true,
@@ -160,6 +178,9 @@ static const struct mtk_chip_config mtk_default_chip_info = {
};

static const struct of_device_id mtk_spi_of_match[] = {
+ { .compatible = "mediatek,mt7986-spi-single",
+ .data = (void *)&mt7986_compat_single,
+ },
{ .compatible = "mediatek,mt2701-spi",
.data = (void *)&mtk_common_compat,
},
@@ -278,12 +299,11 @@ static int mtk_spi_set_hw_cs_timing(struct spi_device *spi)
return 0;
}

-static int mtk_spi_prepare_message(struct spi_master *master,
- struct spi_message *msg)
+static int mtk_spi_hw_init(struct spi_master *master,
+ struct spi_device *spi)
{
u16 cpha, cpol;
u32 reg_val;
- struct spi_device *spi = msg->spi;
struct mtk_chip_config *chip_config = spi->controller_data;
struct mtk_spi *mdata = spi_master_get_devdata(master);

@@ -291,6 +311,15 @@ static int mtk_spi_prepare_message(struct spi_master *master,
cpol = spi->mode & SPI_CPOL ? 1 : 0;

reg_val = readl(mdata->base + SPI_CMD_REG);
+ if (mdata->dev_comp->ipm_design) {
+ /* SPI transfer without idle time until packet length done */
+ reg_val |= SPI_CMD_IPM_NONIDLE_MODE;
+ if (spi->mode & SPI_LOOP)
+ reg_val |= SPI_CMD_IPM_SPIM_LOOP;
+ else
+ reg_val &= ~SPI_CMD_IPM_SPIM_LOOP;
+ }
+
if (cpha)
reg_val |= SPI_CMD_CPHA;
else
@@ -348,23 +377,39 @@ static int mtk_spi_prepare_message(struct spi_master *master,
mdata->base + SPI_PAD_SEL_REG);

/* tick delay */
- reg_val = readl(mdata->base + SPI_CFG1_REG);
if (mdata->dev_comp->enhance_timing) {
- reg_val &= ~SPI_CFG1_GET_TICK_DLY_MASK;
- reg_val |= ((chip_config->tick_delay & 0x7)
- << SPI_CFG1_GET_TICK_DLY_OFFSET);
+ if (mdata->dev_comp->ipm_design) {
+ reg_val = readl(mdata->base + SPI_CMD_REG);
+ reg_val &= ~SPI_CMD_IPM_GET_TICKDLY_MASK;
+ reg_val |= ((chip_config->tick_delay & 0x7)
+ << SPI_CMD_IPM_GET_TICKDLY_OFFSET);
+ writel(reg_val, mdata->base + SPI_CMD_REG);
+ } else {
+ reg_val = readl(mdata->base + SPI_CFG1_REG);
+ reg_val &= ~SPI_CFG1_GET_TICK_DLY_MASK;
+ reg_val |= ((chip_config->tick_delay & 0x7)
+ << SPI_CFG1_GET_TICK_DLY_OFFSET);
+ writel(reg_val, mdata->base + SPI_CFG1_REG);
+ }
} else {
+ reg_val = readl(mdata->base + SPI_CFG1_REG);
reg_val &= ~SPI_CFG1_GET_TICK_DLY_MASK_V1;
reg_val |= ((chip_config->tick_delay & 0x3)
<< SPI_CFG1_GET_TICK_DLY_OFFSET_V1);
+ writel(reg_val, mdata->base + SPI_CFG1_REG);
}
- writel(reg_val, mdata->base + SPI_CFG1_REG);

/* set hw cs timing */
mtk_spi_set_hw_cs_timing(spi);
return 0;
}

+static int mtk_spi_prepare_message(struct spi_master *master,
+ struct spi_message *msg)
+{
+ return mtk_spi_hw_init(master, msg->spi);
+}
+
static void mtk_spi_set_cs(struct spi_device *spi, bool enable)
{
u32 reg_val;
@@ -386,13 +431,13 @@ static void mtk_spi_set_cs(struct spi_device *spi, bool enable)
}

static void mtk_spi_prepare_transfer(struct spi_master *master,
- struct spi_transfer *xfer)
+ u32 speed_hz)
{
u32 div, sck_time, reg_val;
struct mtk_spi *mdata = spi_master_get_devdata(master);

- if (xfer->speed_hz < mdata->spi_clk_hz / 2)
- div = DIV_ROUND_UP(mdata->spi_clk_hz, xfer->speed_hz);
+ if (speed_hz < mdata->spi_clk_hz / 2)
+ div = DIV_ROUND_UP(mdata->spi_clk_hz, speed_hz);
else
div = 1;

@@ -423,12 +468,24 @@ static void mtk_spi_setup_packet(struct spi_master *master)
u32 packet_size, packet_loop, reg_val;
struct mtk_spi *mdata = spi_master_get_devdata(master);

- packet_size = min_t(u32, mdata->xfer_len, MTK_SPI_PACKET_SIZE);
+ if (mdata->dev_comp->ipm_design)
+ packet_size = min_t(u32,
+ mdata->xfer_len,
+ MTK_SPI_IPM_PACKET_SIZE);
+ else
+ packet_size = min_t(u32,
+ mdata->xfer_len,
+ MTK_SPI_PACKET_SIZE);
+
packet_loop = mdata->xfer_len / packet_size;

reg_val = readl(mdata->base + SPI_CFG1_REG);
- reg_val &= ~(SPI_CFG1_PACKET_LENGTH_MASK | SPI_CFG1_PACKET_LOOP_MASK);
+ if (mdata->dev_comp->ipm_design)
+ reg_val &= ~SPI_CFG1_IPM_PACKET_LENGTH_MASK;
+ else
+ reg_val &= ~SPI_CFG1_PACKET_LENGTH_MASK;
reg_val |= (packet_size - 1) << SPI_CFG1_PACKET_LENGTH_OFFSET;
+ reg_val &= ~SPI_CFG1_PACKET_LOOP_MASK;
reg_val |= (packet_loop - 1) << SPI_CFG1_PACKET_LOOP_OFFSET;
writel(reg_val, mdata->base + SPI_CFG1_REG);
}
@@ -523,7 +580,7 @@ static int mtk_spi_fifo_transfer(struct spi_master *master,
mdata->cur_transfer = xfer;
mdata->xfer_len = min(MTK_SPI_MAX_FIFO_SIZE, xfer->len);
mdata->num_xfered = 0;
- mtk_spi_prepare_transfer(master, xfer);
+ mtk_spi_prepare_transfer(master, xfer->speed_hz);
mtk_spi_setup_packet(master);

if (xfer->tx_buf) {
@@ -556,7 +613,7 @@ static int mtk_spi_dma_transfer(struct spi_master *master,
mdata->cur_transfer = xfer;
mdata->num_xfered = 0;

- mtk_spi_prepare_transfer(master, xfer);
+ mtk_spi_prepare_transfer(master, xfer->speed_hz);

cmd = readl(mdata->base + SPI_CMD_REG);
if (xfer->tx_buf)
@@ -591,6 +648,19 @@ static int mtk_spi_transfer_one(struct spi_master *master,
struct spi_device *spi,
struct spi_transfer *xfer)
{
+ struct mtk_spi *mdata = spi_master_get_devdata(spi->master);
+ u32 reg_val = 0;
+
+ /* prepare xfer direction and duplex mode */
+ if (mdata->dev_comp->ipm_design) {
+ if (!xfer->tx_buf || !xfer->rx_buf) {
+ reg_val |= SPI_CFG3_IPM_HALF_DUPLEX_EN;
+ if (xfer->rx_buf)
+ reg_val |= SPI_CFG3_IPM_HALF_DUPLEX_DIR;
+ }
+ writel(reg_val, mdata->base + SPI_CFG3_IPM_REG);
+ }
+
if (master->can_dma(master, spi, xfer))
return mtk_spi_dma_transfer(master, spi, xfer);
else
@@ -757,6 +827,8 @@ static int mtk_spi_probe(struct platform_device *pdev)

if (mdata->dev_comp->must_tx)
master->flags = SPI_MASTER_MUST_TX;
+ if (mdata->dev_comp->ipm_design)
+ master->mode_bits |= SPI_LOOP;

if (mdata->dev_comp->need_pad_sel) {
mdata->pad_num = of_property_count_u32_elems(
--
2.25.1
\
 
 \ /
  Last update: 2022-03-07 07:53    [W:0.071 / U:0.368 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site