[U-Boot] [PATCH 07/10] spi: sun4: Add A31 spi controller support
Jagan Teki
jagan at amarulasolutions.com
Sat Feb 9 13:14:57 UTC 2019
Add A31 spi controller support for existing sun4i_spi driver via driver
data, this would simply add A31 register along with proper register bits
via enum sets.
Signed-off-by: Jagan Teki <jagan at amarulasolutions.com>
---
drivers/spi/Kconfig | 4 +-
drivers/spi/sun4i_spi.c | 84 ++++++++++++++++++++++++++++++++++++++++-
2 files changed, 85 insertions(+), 3 deletions(-)
diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
index ac7fbab841..15207d23c1 100644
--- a/drivers/spi/Kconfig
+++ b/drivers/spi/Kconfig
@@ -223,9 +223,9 @@ config STM32_QSPI
this ST IP core.
config SUN4I_SPI
- bool "Allwinner A10 SoCs SPI controller"
+ bool "Allwinner A10/A31 SoCs SPI controller"
help
- SPI driver for Allwinner sun4i, sun5i and sun7i SoCs
+ This enables using the SPI controller on the Allwinner A10/A31 SoCs.
config TEGRA114_SPI
bool "nVidia Tegra114 SPI driver"
diff --git a/drivers/spi/sun4i_spi.c b/drivers/spi/sun4i_spi.c
index aeed68764c..36f2215f7d 100644
--- a/drivers/spi/sun4i_spi.c
+++ b/drivers/spi/sun4i_spi.c
@@ -24,6 +24,7 @@
#include <spi.h>
#include <errno.h>
#include <fdt_support.h>
+#include <reset.h>
#include <wait_bit.h>
#include <asm/bitops.h>
@@ -84,6 +85,18 @@
#define SUN4I_FIFO_STA_TF_CNT_MASK 0x7f
#define SUN4I_FIFO_STA_TF_CNT_BITS 16
+/* sun6i spi registers */
+#define SUN6I_GBL_CTL_REG 0x04
+#define SUN6I_TFR_CTL_REG 0x08
+#define SUN6I_FIFO_CTL_REG 0x18
+#define SUN6I_FIFO_STA_REG 0x1c
+#define SUN6I_CLK_CTL_REG 0x24
+#define SUN6I_BURST_CNT_REG 0x30
+#define SUN6I_XMIT_CNT_REG 0x34
+#define SUN6I_BURST_CTL_REG 0x38
+#define SUN6I_TXDATA_REG 0x200
+#define SUN6I_RXDATA_REG 0x300
+
#define SUN4I_SPI_MAX_RATE 24000000
#define SUN4I_SPI_MIN_RATE 3000
#define SUN4I_SPI_DEFAULT_RATE 1000000
@@ -106,6 +119,7 @@ enum sun4i_spi_regs {
/* sun spi register bits */
enum sun4i_spi_bits {
SPI_GCR_TP,
+ SPI_GCR_SRST,
SPI_TCR_CPHA,
SPI_TCR_CPOL,
SPI_TCR_CS_ACTIVE_LOW,
@@ -133,6 +147,7 @@ struct sun4i_spi_platdata {
struct sun4i_spi_priv {
struct sun4i_spi_variant *variant;
struct clk clk_ahb, clk_mod;
+ struct reset_ctl reset;
u32 base_addr;
u32 freq;
u32 mode;
@@ -255,7 +270,10 @@ static int sun4i_spi_parse_pins(struct udevice *dev)
if (pin < 0)
break;
- sunxi_gpio_set_cfgpin(pin, SUNXI_GPC_SPI0);
+ if (IS_ENABLED(CONFIG_MACH_SUN50I))
+ sunxi_gpio_set_cfgpin(pin, SUN50I_GPC_SPI0);
+ else
+ sunxi_gpio_set_cfgpin(pin, SUNXI_GPC_SPI0);
sunxi_gpio_set_drv(pin, drive);
sunxi_gpio_set_pull(pin, pull);
}
@@ -271,6 +289,8 @@ static inline int sun4i_spi_set_clock(struct udevice *dev, bool enable)
if (!enable) {
clk_disable(&priv->clk_ahb);
clk_disable(&priv->clk_mod);
+ if (reset_valid(&priv->reset))
+ reset_assert(&priv->reset);
return 0;
}
@@ -286,8 +306,18 @@ static inline int sun4i_spi_set_clock(struct udevice *dev, bool enable)
goto err_ahb;
}
+ if (reset_valid(&priv->reset)) {
+ ret = reset_deassert(&priv->reset);
+ if (ret) {
+ dev_err(dev, "failed to deassert reset\n");
+ goto err_mod;
+ }
+ }
+
return 0;
+err_mod:
+ clk_disable(&priv->clk_mod);
err_ahb:
clk_disable(&priv->clk_ahb);
return ret;
@@ -328,6 +358,12 @@ static int sun4i_spi_probe(struct udevice *bus)
return ret;
}
+ ret = reset_get_by_index(bus, 0, &priv->reset);
+ if (ret && ret != -ENOENT) {
+ dev_err(dev, "failed to get reset\n");
+ return ret;
+ }
+
sun4i_spi_parse_pins(bus);
priv->variant = plat->variant;
@@ -351,6 +387,10 @@ static int sun4i_spi_claim_bus(struct udevice *dev)
SUN4I_CTL_ENABLE | SUN4I_CTL_MASTER |
variant->bits[SPI_GCR_TP]);
+ if (IS_ENABLED(CONFIG_SUNXI_GEN_SUN6I))
+ setbits_le32(priv->base_addr + variant->regs[SPI_GCR],
+ variant->bits[SPI_GCR_SRST]);
+
setbits_le32(priv->base_addr + variant->regs[SPI_TCR],
variant->bits[SPI_TCR_CS_MANUAL] |
variant->bits[SPI_TCR_CS_ACTIVE_LOW]);
@@ -409,6 +449,9 @@ static int sun4i_spi_xfer(struct udevice *dev, unsigned int bitlen,
priv->base_addr + variant->regs[SPI_BC]);
writel(SUN4I_XMIT_CNT(nbytes),
priv->base_addr + variant->regs[SPI_TC]);
+ if (IS_ENABLED(CONFIG_SUNXI_GEN_SUN6I))
+ writel(SUN4I_BURST_CNT(nbytes),
+ priv->base_addr + variant->regs[SPI_BCTL]);
/* Fill the TX FIFO */
sun4i_spi_fill_fifo(priv, nbytes);
@@ -547,17 +590,56 @@ static const unsigned long sun4i_spi_bits[] = {
[SPI_FSR_RF_CNT_MASK] = GENMASK(6, 0),
};
+static const unsigned long sun8i_spi_regs[] = {
+ [SPI_GCR] = SUN6I_GBL_CTL_REG,
+ [SPI_TCR] = SUN6I_TFR_CTL_REG,
+ [SPI_FCR] = SUN6I_FIFO_CTL_REG,
+ [SPI_FSR] = SUN6I_FIFO_STA_REG,
+ [SPI_CCR] = SUN6I_CLK_CTL_REG,
+ [SPI_BC] = SUN6I_BURST_CNT_REG,
+ [SPI_TC] = SUN6I_XMIT_CNT_REG,
+ [SPI_BCTL] = SUN6I_BURST_CTL_REG,
+ [SPI_TXD] = SUN6I_TXDATA_REG,
+ [SPI_RXD] = SUN6I_RXDATA_REG,
+};
+
+static const unsigned long sun8i_spi_bits[] = {
+ [SPI_GCR_TP] = BIT(7),
+ [SPI_GCR_SRST] = BIT(31),
+ [SPI_TCR_CPHA] = BIT(0),
+ [SPI_TCR_CPOL] = BIT(1),
+ [SPI_TCR_CS_ACTIVE_LOW] = BIT(2),
+ [SPI_TCR_CS_SEL] = 4,
+ [SPI_TCR_CS_MASK] = 0x30,
+ [SPI_TCR_CS_MANUAL] = BIT(6),
+ [SPI_TCR_CS_LEVEL] = BIT(7),
+ [SPI_TCR_XCH] = BIT(31),
+ [SPI_FCR_RF_RST] = BIT(15),
+ [SPI_FCR_TF_RST] = BIT(31),
+ [SPI_FSR_RF_CNT_MASK] = GENMASK(7, 0),
+};
+
static const struct sun4i_spi_variant sun4i_a10_spi_variant = {
.regs = sun4i_spi_regs,
.bits = sun4i_spi_bits,
.fifo_depth = 64,
};
+static const struct sun4i_spi_variant sun8i_h3_spi_variant = {
+ .regs = sun8i_spi_regs,
+ .bits = sun8i_spi_bits,
+ .fifo_depth = 64,
+};
+
static const struct udevice_id sun4i_spi_ids[] = {
{
.compatible = "allwinner,sun4i-a10-spi",
.data = (ulong)&sun4i_a10_spi_variant,
},
+ {
+ .compatible = "allwinner,sun8i-h3-spi",
+ .data = (ulong)&sun8i_h3_spi_variant,
+ },
{ }
};
--
2.18.0.321.gffc6fa0e3
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