[PATCH 3/6] sunxi: SPL SPI: Introduce is_new_gen_spi()

[Andre Przywara]

So far we were using the CONFIG_SUNXI_GEN_SUN6I symbol to select between
the two SPI controller generations used on Allwinner SoCs. This is a
convenience symbol to roughly differentiate between "older" and "newer"
generation of SoCs.

The H6 SoCs is the newest SoC so far, but is sufficiently different to
not define this symbol. However it is using a SPI controller compatible
to the "new gen" SoCs.

To prepare for H6 support, we replace the check for this single symbol
with an explicit function, which can later be extended.
For now we just return CONFIG_SUNXI_GEN_SUN6I in there, so this does not
create a functional change.

Signed-off-by: Andre Przywara <andre.przywara at arm.com>
---
 arch/arm/mach-sunxi/spl_spi_sunxi.c | 22 ++++++++++++++--------
 1 file changed, 14 insertions(+), 8 deletions(-)

diff --git a/arch/arm/mach-sunxi/spl_spi_sunxi.c b/arch/arm/mach-sunxi/spl_spi_sunxi.c
index 5b4598a25b..b19f1bf4af 100644
--- a/arch/arm/mach-sunxi/spl_spi_sunxi.c
+++ b/arch/arm/mach-sunxi/spl_spi_sunxi.c
@@ -100,9 +100,14 @@ static void spi0_pinmux_setup(unsigned int pin_function)
 		sunxi_gpio_set_cfgpin(SUNXI_GPC(3), pin_function);
 }
 
+static bool is_new_gen_spi(void)
+{
+	return IS_ENABLED(CONFIG_SUNXI_GEN_SUN6I);
+}
+
 static uintptr_t spi0_base_address(void)
 {
-	if (!IS_ENABLED(CONFIG_SUNXI_GEN_SUN6I))
+	if (!is_new_gen_spi())
 		return 0x01C05000;
 
 	return 0x01C68000;
@@ -116,7 +121,7 @@ static void spi0_enable_clock(void)
 	uintptr_t base = spi0_base_address();
 
 	/* Deassert SPI0 reset on SUN6I */
-	if (IS_ENABLED(CONFIG_SUNXI_GEN_SUN6I))
+	if (is_new_gen_spi())
 		setbits_le32(SUN6I_BUS_SOFT_RST_REG0,
 			     (1 << AHB_RESET_SPI0_SHIFT));
 
@@ -124,12 +129,12 @@ static void spi0_enable_clock(void)
 	setbits_le32(CCM_AHB_GATING0, (1 << AHB_GATE_OFFSET_SPI0));
 
 	/* Divide by 4 */
-	writel(SPI0_CLK_DIV_BY_4, base + (IS_ENABLED(CONFIG_SUNXI_GEN_SUN6I) ?
+	writel(SPI0_CLK_DIV_BY_4, base + (is_new_gen_spi() ?
 				  SUN6I_SPI0_CCTL : SUN4I_SPI0_CCTL));
 	/* 24MHz from OSC24M */
 	writel((1 << 31), CCM_SPI0_CLK);
 
-	if (IS_ENABLED(CONFIG_SUNXI_GEN_SUN6I)) {
+	if (is_new_gen_spi()) {
 		/* Enable SPI in the master mode and do a soft reset */
 		setbits_le32(base + SUN6I_SPI0_GCR, SUN6I_CTL_MASTER |
 			     SUN6I_CTL_ENABLE | SUN6I_CTL_SRST);
@@ -150,7 +155,7 @@ static void spi0_disable_clock(void)
 	uintptr_t base = spi0_base_address();
 
 	/* Disable the SPI0 controller */
-	if (IS_ENABLED(CONFIG_SUNXI_GEN_SUN6I))
+	if (is_new_gen_spi())
 		clrbits_le32(base + SUN6I_SPI0_GCR, SUN6I_CTL_MASTER |
 					     SUN6I_CTL_ENABLE);
 	else
@@ -164,7 +169,7 @@ static void spi0_disable_clock(void)
 	clrbits_le32(CCM_AHB_GATING0, (1 << AHB_GATE_OFFSET_SPI0));
 
 	/* Assert SPI0 reset on SUN6I */
-	if (IS_ENABLED(CONFIG_SUNXI_GEN_SUN6I))
+	if (is_new_gen_spi())
 		clrbits_le32(SUN6I_BUS_SOFT_RST_REG0,
 			     (1 << AHB_RESET_SPI0_SHIFT));
 }
@@ -184,7 +189,8 @@ static void spi0_deinit(void)
 {
 	/* New SoCs can disable pins, older could only set them as input */
 	unsigned int pin_function = SUNXI_GPIO_INPUT;
-	if (IS_ENABLED(CONFIG_SUNXI_GEN_SUN6I))
+
+	if (is_new_gen_spi())
 		pin_function = SUNXI_GPIO_DISABLE;
 
 	spi0_disable_clock();
@@ -245,7 +251,7 @@ static void spi0_read_data(void *buf, u32 addr, u32 len)
 		if (chunk_len > SPI_READ_MAX_SIZE)
 			chunk_len = SPI_READ_MAX_SIZE;
 
-		if (IS_ENABLED(CONFIG_SUNXI_GEN_SUN6I)) {
+		if (is_new_gen_spi()) {
 			sunxi_spi0_read_data(buf8, addr, chunk_len,
 					     base + SUN6I_SPI0_TCR,
 					     SUN6I_TCR_XCH,
-- 
2.14.5