sun6i: Make dram clk and zq value Kconfig options

It turns out that there is a too large spread between boards to handle this
with a default value, turn this into Kconfig options, and set the values
the factory images are using for the Colombus and Mele_M9 boards.

Note this changes the ZQ default when not overriden through defconfig from
120 to 123, as that is what most boards seem to actually use.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Ian Campbell <ijc@hellion.org.uk>

arch/arm/cpu/armv7/sunxi/dram_sun6i.c

@@ -17,9 +17,7 @@
 #include <asm/arch/dram.h>
 #include <asm/arch/prcm.h>
 
-/* DRAM clk & zq defaults, maybe turn these into Kconfig options ? */
+#define DRAM_CLK (CONFIG_DRAM_CLK * 1000000)
-#define DRAM_CLK_DEFAULT 312000000
-#define DRAM_ZQ_DEFAULT 0x78
 
 struct dram_sun6i_para {
 	u8 bus_width;
@@ -48,7 +46,7 @@ static void mctl_sys_init(void)
 		(struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
 	const int dram_clk_div = 2;
 
-	clock_set_pll5(DRAM_CLK_DEFAULT * dram_clk_div);
+	clock_set_pll5(DRAM_CLK * dram_clk_div);
 
 	clrsetbits_le32(&ccm->dram_clk_cfg, CCM_DRAMCLK_CFG_DIV0_MASK,
 		CCM_DRAMCLK_CFG_DIV0(dram_clk_div) | CCM_DRAMCLK_CFG_RST |
@@ -170,7 +168,7 @@ static void mctl_channel_init(int ch_index, struct dram_sun6i_para *para)
 
 	await_completion(&mctl_phy->pgsr, 0x03, 0x03);
 
-	writel(DRAM_ZQ_DEFAULT, &mctl_phy->zq0cr1);
+	writel(CONFIG_DRAM_ZQ, &mctl_phy->zq0cr1);
 
 	setbits_le32(&mctl_phy->pir, MCTL_PIR_CLEAR_STATUS);
 	writel(MCTL_PIR_STEP1, &mctl_phy->pir);
@@ -216,9 +214,9 @@ static void mctl_channel_init(int ch_index, struct dram_sun6i_para *para)
 	await_completion(&mctl_ctl->sstat, 0x07, 0x01);
 
 	/* Set number of clks per micro-second */
-	writel(DRAM_CLK_DEFAULT / 1000000, &mctl_ctl->togcnt1u);
+	writel(DRAM_CLK / 1000000, &mctl_ctl->togcnt1u);
 	/* Set number of clks per 100 nano-seconds */
-	writel(DRAM_CLK_DEFAULT / 10000000, &mctl_ctl->togcnt100n);
+	writel(DRAM_CLK / 10000000, &mctl_ctl->togcnt100n);
 	/* Set memory timing registers */
 	writel(MCTL_TREFI, &mctl_ctl->trefi);
 	writel(MCTL_TMRD, &mctl_ctl->tmrd);

board/sunxi/Kconfig

@@ -32,6 +32,23 @@ config MACH_SUN8I
 
 endchoice
 
+if MACH_SUN6I
+
+config DRAM_CLK
+	int "sun6i dram clock speed"
+	default 312
+	---help---
+	Set the dram clock speed, valid range 240 - 480, must be a multiple
+	of 24.
+
+config DRAM_ZQ
+	int "sun6i dram zq value"
+	default 123
+	---help---
+	Set the dram zq value.
+
+endif
+
 config SYS_CONFIG_NAME
 	default "sun4i" if MACH_SUN4I
 	default "sun5i" if MACH_SUN5I

configs/Colombus_defconfig

@@ -5,3 +5,5 @@ CONFIG_USB_KEYBOARD=n
 +S:CONFIG_ARCH_SUNXI=y
 +S:CONFIG_MACH_SUN6I=y
 +S:CONFIG_TARGET_COLOMBUS=y
++S:CONFIG_DRAM_CLK=288
++S:CONFIG_DRAM_ZQ=379

configs/Mele_M9_defconfig

@@ -5,6 +5,8 @@ CONFIG_FDTFILE="sun6i-a31-m9.dtb"
 +S:CONFIG_ARCH_SUNXI=y
 +S:CONFIG_MACH_SUN6I=y
 +S:CONFIG_TARGET_MELE_M9=y
++S:CONFIG_DRAM_CLK=312
++S:CONFIG_DRAM_ZQ=120
 # Ethernet phy power
 +S:CONFIG_AXP221_DLDO1_VOLT=3300
 # USB hub power