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spi: mediatek: add ipm design support for MT7986

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this patch add the support of ipm design.

Signed-off-by: Leilk Liu <leilk.liu@mediatek.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20220315032411.2826-4-leilk.liu@mediatek.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Leilk Liu 2022-03-15 11:24:08 +08:00 committed by Mark Brown
parent da40a352db
commit 7e963fb2a3
No known key found for this signature in database
GPG key ID: 24D68B725D5487D0
1 changed files with 87 additions and 15 deletions
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102
drivers/spi/spi-mt65xx.c
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@ -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 adjust and extend register to support more 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 mtk_ipm_compat = {
.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,spi-ipm",
.data = (void *)&mtk_ipm_compat,
},
{ .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(