[RFC PATCH 07/17] pinctrl: sunxi: add new D1 pinctrl support

[Andre Przywara]

For the first time since at least the Allwinner A10 SoCs, the D1 (and
related cores) use a new pincontroller MMIO register layout, so we
cannot use our hardcoded, fixed offsets anymore.
Ideally this would all be handled by devicetree and DM drivers, but for
the DT-less SPL we still need the legacy interfaces.

Add a new Kconfig symbol to differenciate between the two generations of
pincontrollers, and just use that to just switch some basic symbols.
The rest is already abstracted enough, so works out of the box.

Signed-off-by: Andre Przywara <andre.przywara at arm.com>
---
 arch/arm/mach-sunxi/Kconfig |  6 ++++++
 include/sunxi_gpio.h        | 26 +++++++++++++++++++++-----
 2 files changed, 27 insertions(+), 5 deletions(-)

diff --git a/arch/arm/mach-sunxi/Kconfig b/arch/arm/mach-sunxi/Kconfig
index 6220175d612..5e019948f85 100644
--- a/arch/arm/mach-sunxi/Kconfig
+++ b/arch/arm/mach-sunxi/Kconfig
@@ -113,6 +113,12 @@ config SUNXI_SRAM_ADDRESS
 config SUNXI_A64_TIMER_ERRATUM
 	bool
 
+config SUNXI_NEW_PINCTRL
+	bool
+	---help---
+	The Allwinner D1 and other new SoCs use a different register map
+	for the GPIO block, which we need to know about in the SPL.
+
 # Note only one of these may be selected at a time! But hidden choices are
 # not supported by Kconfig
 config SUNXI_GEN_SUN4I
diff --git a/include/sunxi_gpio.h b/include/sunxi_gpio.h
index 5ac476f960d..2f8b220f750 100644
--- a/include/sunxi_gpio.h
+++ b/include/sunxi_gpio.h
@@ -68,15 +68,32 @@
 #define GPIO_DAT_REG_OFFSET	0x10
 
 #define GPIO_DRV_REG_OFFSET	0x14
-#define GPIO_DRV_INDEX(pin)	(((pin) & 0x1f) >> 4)
-#define GPIO_DRV_OFFSET(pin)	((((pin) & 0x1f) & 0xf) << 1)
+
+/*		Newer SoCs use a slightly different register layout */
+#ifdef CONFIG_SUNXI_NEW_PINCTRL
+/* pin drive strength: 4 bits per pin */
+#define GPIO_DRV_INDEX(pin)	((pin) / 8)
+#define GPIO_DRV_OFFSET(pin)	(((pin) % 8) * 4)
+
+#define GPIO_PULL_REG_OFFSET	0x24
+
+#define SUNXI_PINCTRL_BANK_SIZE	0x30
+#define SUNXI_GPIO_DISABLE	0xf
+
+#else /* older generation pin controllers */
+/* pin drive strength: 2 bits per pin */
+#define GPIO_DRV_INDEX(pin)	((pin) / 16)
+#define GPIO_DRV_OFFSET(pin)	(((pin) % 16) * 2)
 
 #define GPIO_PULL_REG_OFFSET	0x1c
+
+#define SUNXI_PINCTRL_BANK_SIZE	0x24
+#define SUNXI_GPIO_DISABLE	0x7
+#endif
+
 #define GPIO_PULL_INDEX(pin)	(((pin) & 0x1f) >> 4)
 #define GPIO_PULL_OFFSET(pin)	((((pin) & 0x1f) & 0xf) << 1)
 
-#define SUNXI_PINCTRL_BANK_SIZE 0x24
-
 static inline void* BANK_TO_GPIO(int bank)
 {
 	void *pio_base;
@@ -132,7 +149,6 @@ enum sunxi_gpio_number {
 /* GPIO pin function config */
 #define SUNXI_GPIO_INPUT	0
 #define SUNXI_GPIO_OUTPUT	1
-#define SUNXI_GPIO_DISABLE	7
 
 #define SUN8I_H3_GPA_UART0	2
 #define SUN8I_H3_GPA_UART2	2
-- 
2.35.5