[U-Boot] [PATCH v3 8/9] spi: sun4i: Driver cleanup

Jagan Teki
2019-02-27T14:32:12Z

- drop unused macros.
- use base instead of base_addr, for better code readability
- move .probe and .ofdata_to_platdata functions in required
places to add platdata support in future.
- use sentinel sun4i_spi_ids.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
---
drivers/spi/sun4i_spi.c | 190 +++++++++++++++++-----------------------
1 file changed, 80 insertions(+), 110 deletions(-)

diff --git a/drivers/spi/sun4i_spi.c b/drivers/spi/sun4i_spi.c
index da9984c004..dbfeac77ee 100644
--- a/drivers/spi/sun4i_spi.c
+++ b/drivers/spi/sun4i_spi.c
@@ -33,57 +33,16 @@

#include <linux/iopoll.h>

-#define SUN4I_RXDATA_REG 0x00
-
-#define SUN4I_TXDATA_REG 0x04
-
-#define SUN4I_CTL_REG 0x08
-#define SUN4I_CTL_ENABLE BIT(0)
-#define SUN4I_CTL_MASTER BIT(1)
-#define SUN4I_CTL_CPHA BIT(2)
-#define SUN4I_CTL_CPOL BIT(3)
-#define SUN4I_CTL_CS_ACTIVE_LOW BIT(4)
-#define SUN4I_CTL_LMTF BIT(6)
-#define SUN4I_CTL_TF_RST BIT(8)
-#define SUN4I_CTL_RF_RST BIT(9)
-#define SUN4I_CTL_XCH BIT(10)
-#define SUN4I_CTL_CS_MASK 0x3000
-#define SUN4I_CTL_CS(cs) (((cs) << 12) & SUN4I_CTL_CS_MASK)
-#define SUN4I_CTL_DHB BIT(15)
-#define SUN4I_CTL_CS_MANUAL BIT(16)
-#define SUN4I_CTL_CS_LEVEL BIT(17)
-#define SUN4I_CTL_TP BIT(18)
-
-#define SUN4I_INT_CTL_REG 0x0c
-#define SUN4I_INT_CTL_RF_F34 BIT(4)
-#define SUN4I_INT_CTL_TF_E34 BIT(12)
-#define SUN4I_INT_CTL_TC BIT(16)
-
-#define SUN4I_INT_STA_REG 0x10
-
-#define SUN4I_DMA_CTL_REG 0x14
-
-#define SUN4I_WAIT_REG 0x18
-
-#define SUN4I_CLK_CTL_REG 0x1c
-#define SUN4I_CLK_CTL_CDR2_MASK 0xff
-#define SUN4I_CLK_CTL_CDR2(div) ((div) & SUN4I_CLK_CTL_CDR2_MASK)
-#define SUN4I_CLK_CTL_CDR1_MASK 0xf
-#define SUN4I_CLK_CTL_CDR1(div) (((div) & SUN4I_CLK_CTL_CDR1_MASK) << 8)
-#define SUN4I_CLK_CTL_DRS BIT(12)
-
-#define SUN4I_MAX_XFER_SIZE 0xffffff
-
-#define SUN4I_BURST_CNT_REG 0x20
-#define SUN4I_BURST_CNT(cnt) ((cnt) & SUN4I_MAX_XFER_SIZE)
-
-#define SUN4I_XMIT_CNT_REG 0x24
-#define SUN4I_XMIT_CNT(cnt) ((cnt) & SUN4I_MAX_XFER_SIZE)
+DECLARE_GLOBAL_DATA_PTR;

-#define SUN4I_FIFO_STA_REG 0x28
-#define SUN4I_FIFO_STA_RF_CNT_BITS 0
-#define SUN4I_FIFO_STA_TF_CNT_MASK 0x7f
-#define SUN4I_FIFO_STA_TF_CNT_BITS 16
+/* sun4i spi registers */
+#define SUN4I_RXDATA_REG 0x00
+#define SUN4I_TXDATA_REG 0x04
+#define SUN4I_CTL_REG 0x08
+#define SUN4I_CLK_CTL_REG 0x1c
+#define SUN4I_BURST_CNT_REG 0x20
+#define SUN4I_XMIT_CNT_REG 0x24
+#define SUN4I_FIFO_STA_REG 0x28

/* sun6i spi registers */
#define SUN6I_GBL_CTL_REG 0x04
@@ -97,12 +56,25 @@
#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
-#define SUN4I_SPI_TIMEOUT_US 1000000
+/* sun spi bits */
+#define SUN4I_CTL_ENABLE BIT(0)
+#define SUN4I_CTL_MASTER BIT(1)
+#define SUN4I_CLK_CTL_CDR2_MASK 0xff
+#define SUN4I_CLK_CTL_CDR2(div) ((div) & SUN4I_CLK_CTL_CDR2_MASK)
+#define SUN4I_CLK_CTL_CDR1_MASK 0xf
+#define SUN4I_CLK_CTL_CDR1(div) (((div) & SUN4I_CLK_CTL_CDR1_MASK) << 8)
+#define SUN4I_CLK_CTL_DRS BIT(12)
+#define SUN4I_MAX_XFER_SIZE 0xffffff
+#define SUN4I_BURST_CNT(cnt) ((cnt) & SUN4I_MAX_XFER_SIZE)
+#define SUN4I_XMIT_CNT(cnt) ((cnt) & SUN4I_MAX_XFER_SIZE)
+#define SUN4I_FIFO_STA_RF_CNT_BITS 0
+
+#define SUN4I_SPI_MAX_RATE 24000000
+#define SUN4I_SPI_MIN_RATE 3000
+#define SUN4I_SPI_DEFAULT_RATE 1000000
+#define SUN4I_SPI_TIMEOUT_US 1000000

-#define SPI_REG(priv, reg) ((priv)->base_addr + \
+#define SPI_REG(priv, reg) ((priv)->base + \
(priv)->variant->regs[reg])
#define SPI_BIT(priv, bit) ((priv)->variant->bits[bit])
#define SPI_CS(priv, cs) (((cs) << SPI_BIT(priv, SPI_TCR_CS_SEL)) & \
@@ -149,7 +121,7 @@ struct sun4i_spi_variant {

struct sun4i_spi_platdata {
struct sun4i_spi_variant *variant;
- u32 base_addr;
+ u32 base;
u32 max_hz;
};

@@ -157,7 +129,7 @@ struct sun4i_spi_priv {
struct sun4i_spi_variant *variant;
struct clk clk_ahb, clk_mod;
struct reset_ctl reset;
- u32 base_addr;
+ u32 base;
u32 freq;
u32 mode;

@@ -165,8 +137,6 @@ struct sun4i_spi_priv {
u8 *rx_buf;
};

-DECLARE_GLOBAL_DATA_PTR;
-
static inline void sun4i_spi_drain_fifo(struct sun4i_spi_priv *priv, int len)
{
u8 byte;
@@ -328,56 +298,6 @@ err_ahb:
return ret;
}

-static int sun4i_spi_ofdata_to_platdata(struct udevice *bus)
-{
- struct sun4i_spi_platdata *plat = dev_get_platdata(bus);
- int node = dev_of_offset(bus);
-
- plat->base_addr = devfdt_get_addr(bus);
- plat->variant = (struct sun4i_spi_variant *)dev_get_driver_data(bus);
- plat->max_hz = fdtdec_get_int(gd->fdt_blob, node,
- "spi-max-frequency",
- SUN4I_SPI_DEFAULT_RATE);
-
- if (plat->max_hz > SUN4I_SPI_MAX_RATE)
- plat->max_hz = SUN4I_SPI_MAX_RATE;
-
- return 0;
-}
-
-static int sun4i_spi_probe(struct udevice *bus)
-{
- struct sun4i_spi_platdata *plat = dev_get_platdata(bus);
- struct sun4i_spi_priv *priv = dev_get_priv(bus);
- int ret;
-
- ret = clk_get_by_name(bus, "ahb", &priv->clk_ahb);
- if (ret) {
- dev_err(dev, "failed to get ahb clock\n");
- return ret;
- }
-
- ret = clk_get_by_name(bus, "mod", &priv->clk_mod);
- if (ret) {
- dev_err(dev, "failed to get mod clock\n");
- 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;
- priv->base_addr = plat->base_addr;
- priv->freq = plat->max_hz;
-
- return 0;
-}
-
static int sun4i_spi_claim_bus(struct udevice *dev)
{
struct sun4i_spi_priv *priv = dev_get_priv(dev->parent);
@@ -558,6 +478,56 @@ static const struct dm_spi_ops sun4i_spi_ops = {
.set_mode = sun4i_spi_set_mode,
};

+static int sun4i_spi_probe(struct udevice *bus)
+{
+ struct sun4i_spi_platdata *plat = dev_get_platdata(bus);
+ struct sun4i_spi_priv *priv = dev_get_priv(bus);
+ int ret;
+
+ ret = clk_get_by_name(bus, "ahb", &priv->clk_ahb);
+ if (ret) {
+ dev_err(dev, "failed to get ahb clock\n");
+ return ret;
+ }
+
+ ret = clk_get_by_name(bus, "mod", &priv->clk_mod);
+ if (ret) {
+ dev_err(dev, "failed to get mod clock\n");
+ 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;
+ priv->base = plat->base;
+ priv->freq = plat->max_hz;
+
+ return 0;
+}
+
+static int sun4i_spi_ofdata_to_platdata(struct udevice *bus)
+{
+ struct sun4i_spi_platdata *plat = dev_get_platdata(bus);
+ int node = dev_of_offset(bus);
+
+ plat->base = devfdt_get_addr(bus);
+ plat->variant = (struct sun4i_spi_variant *)dev_get_driver_data(bus);
+ plat->max_hz = fdtdec_get_int(gd->fdt_blob, node,
+ "spi-max-frequency",
+ SUN4I_SPI_DEFAULT_RATE);
+
+ if (plat->max_hz > SUN4I_SPI_MAX_RATE)
+ plat->max_hz = SUN4I_SPI_MAX_RATE;
+
+ return 0;
+}
+
static const unsigned long sun4i_spi_regs[] = {
[SPI_GCR] = SUN4I_CTL_REG,
[SPI_TCR] = SUN4I_CTL_REG,
@@ -649,7 +619,7 @@ static const struct udevice_id sun4i_spi_ids[] = {
.compatible = "allwinner,sun8i-h3-spi",
.data = (ulong)&sun8i_h3_spi_variant,
},
- { }
+ { /* sentinel */ }
};

U_BOOT_DRIVER(sun4i_spi) = {
--
2.18.0.321.gffc6fa0e3