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Message-ID: <20231101150811.2747455-5-ben.wolsieffer@hefring.com>
Date: Wed, 1 Nov 2023 11:08:09 -0400
From: Ben Wolsieffer <ben.wolsieffer@...ring.com>
To: linux-spi@...r.kernel.org, devicetree@...r.kernel.org,
linux-stm32@...md-mailman.stormreply.com,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc: Mark Brown <broonie@...nel.org>, Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Conor Dooley <conor+dt@...nel.org>,
Maxime Coquelin <mcoquelin.stm32@...il.com>,
Alexandre Torgue <alexandre.torgue@...s.st.com>,
Alain Volmat <alain.volmat@...s.st.com>,
Erwan Leray <erwan.leray@...s.st.com>,
Fabrice Gasnier <fabrice.gasnier@...s.st.com>,
Ben Wolsieffer <ben.wolsieffer@...ring.com>
Subject: [PATCH 4/5] spi: stm32: add STM32F7 support
The STM32F7 SPI peripheral is similar to the STM32F4, except it allows
arbitrary word lengths between 4 and 16 bits, and has a small 32-bit
FIFO that allows two 8-bit or smaller words to be transferred with a
single 16-bit read/write.
Signed-off-by: Ben Wolsieffer <ben.wolsieffer@...ring.com>
---
drivers/spi/spi-stm32.c | 149 ++++++++++++++++++++++++++++++++++++++++
1 file changed, 149 insertions(+)
diff --git a/drivers/spi/spi-stm32.c b/drivers/spi/spi-stm32.c
index 427788d18532..94df3836834c 100644
--- a/drivers/spi/spi-stm32.c
+++ b/drivers/spi/spi-stm32.c
@@ -41,6 +41,7 @@
#define STM32FX_SPI_CR1_SSM BIT(9)
#define STM32FX_SPI_CR1_RXONLY BIT(10)
#define STM32F4_SPI_CR1_DFF BIT(11)
+#define STM32F7_SPI_CR1_CRCL BIT(11)
#define STM32FX_SPI_CR1_CRCNEXT BIT(12)
#define STM32FX_SPI_CR1_CRCEN BIT(13)
#define STM32FX_SPI_CR1_BIDIOE BIT(14)
@@ -56,6 +57,10 @@
#define STM32FX_SPI_CR2_ERRIE BIT(5)
#define STM32FX_SPI_CR2_RXNEIE BIT(6)
#define STM32FX_SPI_CR2_TXEIE BIT(7)
+#define STM32F7_SPI_CR2_DS GENMASK(11, 8)
+#define STM32F7_SPI_CR2_FRXTH BIT(12)
+#define STM32F7_SPI_CR2_LDMA_RX BIT(13)
+#define STM32F7_SPI_CR2_LDMA_TX BIT(14)
/* STM32FX_SPI_SR bit fields */
#define STM32FX_SPI_SR_RXNE BIT(0)
@@ -67,6 +72,8 @@
#define STM32FX_SPI_SR_OVR BIT(6)
#define STM32FX_SPI_SR_BSY BIT(7)
#define STM32FX_SPI_SR_FRE BIT(8)
+#define STM32F7_SPI_SR_FRLVL GENMASK(10, 9)
+#define STM32F7_SPI_SR_FTLVL GENMASK(12, 11)
/* STM32FX_SPI_I2SCFGR bit fields */
#define STM32FX_SPI_I2SCFGR_I2SMOD BIT(11)
@@ -413,6 +420,16 @@ static int stm32f4_spi_get_bpw_mask(struct stm32_spi *spi)
return SPI_BPW_MASK(8) | SPI_BPW_MASK(16);
}
+/**
+ * stm32f7_spi_get_bpw_mask - Return bits per word mask
+ * @spi: pointer to the spi controller data structure
+ */
+static int stm32f7_spi_get_bpw_mask(struct stm32_spi *spi)
+{
+ dev_dbg(spi->dev, "16-bit maximum data frame\n");
+ return SPI_BPW_RANGE_MASK(4, 16);
+}
+
/**
* stm32h7_spi_get_bpw_mask - Return bits per word mask
* @spi: pointer to the spi controller data structure
@@ -526,6 +543,35 @@ static void stm32f4_spi_write_tx(struct stm32_spi *spi)
dev_dbg(spi->dev, "%s: %d bytes left\n", __func__, spi->tx_len);
}
+/**
+ * stm32f7_spi_write_tx - Write bytes to Transmit Data Register
+ * @spi: pointer to the spi controller data structure
+ *
+ * Read from tx_buf depends on remaining bytes to avoid to read beyond
+ * tx_buf end.
+ */
+static void stm32f7_spi_write_tx(struct stm32_spi *spi)
+{
+ if ((spi->tx_len > 0) && (readl_relaxed(spi->base + STM32FX_SPI_SR) &
+ STM32FX_SPI_SR_TXE)) {
+ u32 offs = spi->cur_xferlen - spi->tx_len;
+
+ if (spi->tx_len >= sizeof(u16)) {
+ const u16 *tx_buf16 = (const u16 *)(spi->tx_buf + offs);
+
+ writew_relaxed(*tx_buf16, spi->base + STM32FX_SPI_DR);
+ spi->tx_len -= sizeof(u16);
+ } else {
+ const u8 *tx_buf8 = (const u8 *)(spi->tx_buf + offs);
+
+ writeb_relaxed(*tx_buf8, spi->base + STM32FX_SPI_DR);
+ spi->tx_len -= sizeof(u8);
+ }
+ }
+
+ dev_dbg(spi->dev, "%s: %d bytes left\n", __func__, spi->tx_len);
+}
+
/**
* stm32h7_spi_write_txfifo - Write bytes in Transmit Data Register
* @spi: pointer to the spi controller data structure
@@ -590,6 +636,46 @@ static void stm32f4_spi_read_rx(struct stm32_spi *spi)
dev_dbg(spi->dev, "%s: %d bytes left\n", __func__, spi->rx_len);
}
+/**
+ * stm32f7_spi_read_rx - Read bytes from Receive Data Register
+ * @spi: pointer to the spi controller data structure
+ *
+ * Write in rx_buf depends on remaining bytes to avoid to write beyond
+ * rx_buf end.
+ */
+static void stm32f7_spi_read_rx(struct stm32_spi *spi)
+{
+ u32 sr = readl_relaxed(spi->base + STM32FX_SPI_SR);
+ u32 frlvl = FIELD_GET(STM32F7_SPI_SR_FRLVL, sr);
+
+ while ((spi->rx_len > 0) && (frlvl > 0)) {
+ u32 offs = spi->cur_xferlen - spi->rx_len;
+
+ if ((spi->rx_len >= sizeof(u16)) && (frlvl >= 2)) {
+ u16 *rx_buf16 = (u16 *)(spi->rx_buf + offs);
+
+ *rx_buf16 = readw_relaxed(spi->base + STM32FX_SPI_DR);
+ spi->rx_len -= sizeof(u16);
+ } else {
+ u8 *rx_buf8 = (u8 *)(spi->rx_buf + offs);
+
+ *rx_buf8 = readb_relaxed(spi->base + STM32FX_SPI_DR);
+ spi->rx_len -= sizeof(u8);
+ }
+
+ sr = readl_relaxed(spi->base + STM32FX_SPI_SR);
+ frlvl = FIELD_GET(STM32F7_SPI_SR_FRLVL, sr);
+ }
+
+ if (spi->rx_len >= sizeof(u16))
+ stm32_spi_clr_bits(spi, STM32FX_SPI_CR2, STM32F7_SPI_CR2_FRXTH);
+ else
+ stm32_spi_set_bits(spi, STM32FX_SPI_CR2, STM32F7_SPI_CR2_FRXTH);
+
+ dev_dbg(spi->dev, "%s: %d bytes left (sr=%08x)\n",
+ __func__, spi->rx_len, sr);
+}
+
/**
* stm32h7_spi_read_rxfifo - Read bytes in Receive Data Register
* @spi: pointer to the spi controller data structure
@@ -1224,6 +1310,22 @@ static void stm32fx_spi_transfer_one_dma_start(struct stm32_spi *spi)
stm32_spi_enable(spi);
}
+/**
+ * stm32f7_spi_transfer_one_dma_start - Set SPI driver registers to start
+ * transfer using DMA
+ * @spi: pointer to the spi controller data structure
+ */
+static void stm32f7_spi_transfer_one_dma_start(struct stm32_spi *spi)
+{
+ /* Configure DMA request trigger threshold according to DMA width */
+ if (spi->cur_bpw <= 8)
+ stm32_spi_set_bits(spi, STM32FX_SPI_CR2, STM32F7_SPI_CR2_FRXTH);
+ else
+ stm32_spi_clr_bits(spi, STM32FX_SPI_CR2, STM32F7_SPI_CR2_FRXTH);
+
+ stm32fx_spi_transfer_one_dma_start(spi);
+}
+
/**
* stm32h7_spi_transfer_one_dma_start - Set SPI driver registers to start
* transfer using DMA
@@ -1362,6 +1464,31 @@ static void stm32f4_spi_set_bpw(struct stm32_spi *spi)
stm32_spi_clr_bits(spi, STM32FX_SPI_CR1, STM32F4_SPI_CR1_DFF);
}
+/**
+ * stm32f7_spi_set_bpw - Configure bits per word
+ * @spi: pointer to the spi controller data structure
+ */
+static void stm32f7_spi_set_bpw(struct stm32_spi *spi)
+{
+ u32 bpw;
+ u32 cr2_clrb = 0, cr2_setb = 0;
+
+ bpw = spi->cur_bpw - 1;
+
+ cr2_clrb |= STM32F7_SPI_CR2_DS;
+ cr2_setb |= FIELD_PREP(STM32F7_SPI_CR2_DS, bpw);
+
+ if (spi->rx_len >= sizeof(u16))
+ cr2_clrb |= STM32F7_SPI_CR2_FRXTH;
+ else
+ cr2_setb |= STM32F7_SPI_CR2_FRXTH;
+
+ writel_relaxed(
+ (readl_relaxed(spi->base + STM32FX_SPI_CR2) &
+ ~cr2_clrb) | cr2_setb,
+ spi->base + STM32FX_SPI_CR2);
+}
+
/**
* stm32h7_spi_set_bpw - configure bits per word
* @spi: pointer to the spi controller data structure
@@ -1771,6 +1898,27 @@ static const struct stm32_spi_cfg stm32f4_spi_cfg = {
.flags = SPI_CONTROLLER_MUST_TX,
};
+static const struct stm32_spi_cfg stm32f7_spi_cfg = {
+ .regs = &stm32fx_spi_regspec,
+ .get_bpw_mask = stm32f7_spi_get_bpw_mask,
+ .disable = stm32fx_spi_disable,
+ .config = stm32fx_spi_config,
+ .set_bpw = stm32f7_spi_set_bpw,
+ .set_mode = stm32fx_spi_set_mode,
+ .write_tx = stm32f7_spi_write_tx,
+ .read_rx = stm32f7_spi_read_rx,
+ .transfer_one_dma_start = stm32f7_spi_transfer_one_dma_start,
+ .dma_tx_cb = stm32fx_spi_dma_tx_cb,
+ .dma_rx_cb = stm32_spi_dma_rx_cb,
+ .transfer_one_irq = stm32fx_spi_transfer_one_irq,
+ .irq_handler_event = stm32fx_spi_irq_event,
+ .irq_handler_thread = stm32fx_spi_irq_thread,
+ .baud_rate_div_min = STM32FX_SPI_BR_DIV_MIN,
+ .baud_rate_div_max = STM32FX_SPI_BR_DIV_MAX,
+ .has_fifo = false,
+ .flags = SPI_CONTROLLER_MUST_TX,
+};
+
static const struct stm32_spi_cfg stm32h7_spi_cfg = {
.regs = &stm32h7_spi_regspec,
.get_fifo_size = stm32h7_spi_get_fifo_size,
@@ -1800,6 +1948,7 @@ static const struct stm32_spi_cfg stm32h7_spi_cfg = {
static const struct of_device_id stm32_spi_of_match[] = {
{ .compatible = "st,stm32h7-spi", .data = (void *)&stm32h7_spi_cfg },
{ .compatible = "st,stm32f4-spi", .data = (void *)&stm32f4_spi_cfg },
+ { .compatible = "st,stm32f7-spi", .data = (void *)&stm32f7_spi_cfg },
{},
};
MODULE_DEVICE_TABLE(of, stm32_spi_of_match);
--
2.42.0
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