[PATCH v2 2/3] mach-sunxi: Add SPL SPI boot for SUNIV

[Jesse Taube]

The SUNIV SoCs come with a sun6i-style SPI controller at the base address
of sun4i SPI controller. The module clock of the SPI controller is
missing which leaves us running directly from the AHB clock, which is
set to 200MHz.

Signed-off-by: Icenowy Zheng <icenowy at aosc.io>
[Icenowy: Original implementation]
Signed-off-by: Jesse Taube <Mr.Bossman075 at gmail.com>
[Jesse: adaptation to Upstream U-Boot]
---
V1 -> V2:
* Change commit description
* Remove redundant conditional statment
* Use else if for pin-function
---
 arch/arm/include/asm/arch-sunxi/gpio.h |  1 +
 arch/arm/mach-sunxi/spl_spi_sunxi.c    | 24 +++++++++++++++++-------
 2 files changed, 18 insertions(+), 7 deletions(-)

diff --git a/arch/arm/include/asm/arch-sunxi/gpio.h b/arch/arm/include/asm/arch-sunxi/gpio.h
index 7f7eb0517c..edd0fbf49f 100644
--- a/arch/arm/include/asm/arch-sunxi/gpio.h
+++ b/arch/arm/include/asm/arch-sunxi/gpio.h
@@ -160,6 +160,7 @@ enum sunxi_gpio_number {
 #define SUNXI_GPC_SDC2		3
 #define SUN6I_GPC_SDC3		4
 #define SUN50I_GPC_SPI0		4
+#define SUNIV_GPC_SPI0		2
 
 #define SUNXI_GPD_LCD0		2
 #define SUNXI_GPD_LVDS0		3
diff --git a/arch/arm/mach-sunxi/spl_spi_sunxi.c b/arch/arm/mach-sunxi/spl_spi_sunxi.c
index 910e805016..734c165e5d 100644
--- a/arch/arm/mach-sunxi/spl_spi_sunxi.c
+++ b/arch/arm/mach-sunxi/spl_spi_sunxi.c
@@ -90,6 +90,7 @@
 
 #define SPI0_CLK_DIV_BY_2           0x1000
 #define SPI0_CLK_DIV_BY_4           0x1001
+#define SPI0_CLK_DIV_BY_32          0x100f
 
 /*****************************************************************************/
 
@@ -132,7 +133,8 @@ static uintptr_t spi0_base_address(void)
 	if (IS_ENABLED(CONFIG_MACH_SUN50I_H6))
 		return 0x05010000;
 
-	if (!is_sun6i_gen_spi())
+	if (!is_sun6i_gen_spi() ||
+	    IS_ENABLED(CONFIG_MACH_SUNIV))
 		return 0x01C05000;
 
 	return 0x01C68000;
@@ -156,11 +158,16 @@ static void spi0_enable_clock(void)
 	if (!IS_ENABLED(CONFIG_MACH_SUN50I_H6))
 		setbits_le32(CCM_AHB_GATING0, (1 << AHB_GATE_OFFSET_SPI0));
 
-	/* Divide by 4 */
-	writel(SPI0_CLK_DIV_BY_4, base + (is_sun6i_gen_spi() ?
-				  SUN6I_SPI0_CCTL : SUN4I_SPI0_CCTL));
-	/* 24MHz from OSC24M */
-	writel((1 << 31), CCM_SPI0_CLK);
+	if (IS_ENABLED(CONFIG_MACH_SUNIV)) {
+		/* Divide by 32, clock source is AHB clock 200MHz */
+		writel(SPI0_CLK_DIV_BY_32, base + SUN6I_SPI0_CCTL);
+	} else {
+		/* Divide by 4 */
+		writel(SPI0_CLK_DIV_BY_4, base + (is_sun6i_gen_spi() ?
+					  SUN6I_SPI0_CCTL : SUN4I_SPI0_CCTL));
+		/* 24MHz from OSC24M */
+		writel((1 << 31), CCM_SPI0_CLK);
+	}
 
 	if (is_sun6i_gen_spi()) {
 		/* Enable SPI in the master mode and do a soft reset */
@@ -191,7 +198,8 @@ static void spi0_disable_clock(void)
 					     SUN4I_CTL_ENABLE);
 
 	/* Disable the SPI0 clock */
-	writel(0, CCM_SPI0_CLK);
+	if (!IS_ENABLED(CONFIG_MACH_SUNIV))
+		writel(0, CCM_SPI0_CLK);
 
 	/* Close the SPI0 gate */
 	if (!IS_ENABLED(CONFIG_MACH_SUN50I_H6))
@@ -212,6 +220,8 @@ static void spi0_init(void)
 	if (IS_ENABLED(CONFIG_MACH_SUN50I) ||
 	    IS_ENABLED(CONFIG_MACH_SUN50I_H6))
 		pin_function = SUN50I_GPC_SPI0;
+	else if (IS_ENABLED(CONFIG_MACH_SUNIV))
+		pin_function = SUNIV_GPC_SPI0;
 
 	spi0_pinmux_setup(pin_function);
 	spi0_enable_clock();
-- 
2.34.1