pinctrl: sunxi: Fix A33 external interrupts not working

pinctrl-sun8i-a33.c (and the dts) declare only 2 interrupt banks,
where as the closely related a23 has 3 banks. This matches with the
datasheet for the A33 where only interrupt banks B and G are specified
where as the A23 has banks A, B and G.

However the A33 being the A23 derative it is means that the interrupt
configure/status io-addresses for the 2 banks it has are not changed
from the A23, iow they have the same address as if bank A was still
present. Where as the sunxi pinctrl currently tries to use the A23 bank
A addresses for bank B, since the pinctrl code does not know about the
removed bank A.

Add a irq_bank_base parameter and use this where appropriate to take
the missing bank A into account.

This fixes external interrupts not working on the A33 (tested with
an i2c touchscreen controller which uses an external interrupt).

Cc: stable@vger.kernel.org
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

3 files changed, 22 insertions, 17 deletions

diff --git a/drivers/pinctrl/sunxi/pinctrl-sun8i-a33.c b/drivers/pinctrl/sunxi/pinctrl-sun8i-a33.c
index 00265f0435a7..8b381d69df86 100644
--- a/drivers/pinctrl/sunxi/pinctrl-sun8i-a33.c
+++ b/drivers/pinctrl/sunxi/pinctrl-sun8i-a33.c
@@ -485,6 +485,7 @@ static const struct sunxi_pinctrl_desc sun8i_a33_pinctrl_data = {
         .pins = sun8i_a33_pins,
         .npins = ARRAY_SIZE(sun8i_a33_pins),
         .irq_banks = 2,
+        .irq_bank_base = 1,
 };
 
 static int sun8i_a33_pinctrl_probe(struct platform_device *pdev)
diff --git a/drivers/pinctrl/sunxi/pinctrl-sunxi.c b/drivers/pinctrl/sunxi/pinctrl-sunxi.c
index 12a1dfabb1af..3b017dbd289c 100644
--- a/drivers/pinctrl/sunxi/pinctrl-sunxi.c
+++ b/drivers/pinctrl/sunxi/pinctrl-sunxi.c
@@ -579,7 +579,7 @@ static void sunxi_pinctrl_irq_release_resources(struct irq_data *d)
 static int sunxi_pinctrl_irq_set_type(struct irq_data *d, unsigned int type)
 {
         struct sunxi_pinctrl *pctl = irq_data_get_irq_chip_data(d);
-        u32 reg = sunxi_irq_cfg_reg(d->hwirq);
+        u32 reg = sunxi_irq_cfg_reg(d->hwirq, pctl->desc->irq_bank_base);
         u8 index = sunxi_irq_cfg_offset(d->hwirq);
         unsigned long flags;
         u32 regval;
@@ -626,7 +626,8 @@ static int sunxi_pinctrl_irq_set_type(struct irq_data *d, unsigned int type)
 static void sunxi_pinctrl_irq_ack(struct irq_data *d)
 {
         struct sunxi_pinctrl *pctl = irq_data_get_irq_chip_data(d);
-        u32 status_reg = sunxi_irq_status_reg(d->hwirq);
+        u32 status_reg = sunxi_irq_status_reg(d->hwirq,
+                                              pctl->desc->irq_bank_base);
         u8 status_idx = sunxi_irq_status_offset(d->hwirq);
 
         /* Clear the IRQ */
@@ -636,7 +637,7 @@ static void sunxi_pinctrl_irq_ack(struct irq_data *d)
 static void sunxi_pinctrl_irq_mask(struct irq_data *d)
 {
         struct sunxi_pinctrl *pctl = irq_data_get_irq_chip_data(d);
-        u32 reg = sunxi_irq_ctrl_reg(d->hwirq);
+        u32 reg = sunxi_irq_ctrl_reg(d->hwirq, pctl->desc->irq_bank_base);
         u8 idx = sunxi_irq_ctrl_offset(d->hwirq);
         unsigned long flags;
         u32 val;
@@ -653,7 +654,7 @@ static void sunxi_pinctrl_irq_mask(struct irq_data *d)
 static void sunxi_pinctrl_irq_unmask(struct irq_data *d)
 {
         struct sunxi_pinctrl *pctl = irq_data_get_irq_chip_data(d);
-        u32 reg = sunxi_irq_ctrl_reg(d->hwirq);
+        u32 reg = sunxi_irq_ctrl_reg(d->hwirq, pctl->desc->irq_bank_base);
         u8 idx = sunxi_irq_ctrl_offset(d->hwirq);
         unsigned long flags;
         u32 val;
@@ -745,7 +746,7 @@ static void sunxi_pinctrl_irq_handler(struct irq_desc *desc)
         if (bank == pctl->desc->irq_banks)
                 return;
 
-        reg = sunxi_irq_status_reg_from_bank(bank);
+        reg = sunxi_irq_status_reg_from_bank(bank, pctl->desc->irq_bank_base);
         val = readl(pctl->membase + reg);
 
         if (val) {
@@ -1024,9 +1025,11 @@ int sunxi_pinctrl_init(struct platform_device *pdev,
 
         for (i = 0; i < pctl->desc->irq_banks; i++) {
                 /* Mask and clear all IRQs before registering a handler */
-                writel(0, pctl->membase + sunxi_irq_ctrl_reg_from_bank(i));
+                writel(0, pctl->membase + sunxi_irq_ctrl_reg_from_bank(i,
+                                                pctl->desc->irq_bank_base));
                 writel(0xffffffff,
-                        pctl->membase + sunxi_irq_status_reg_from_bank(i));
+                       pctl->membase + sunxi_irq_status_reg_from_bank(i,
+                                                pctl->desc->irq_bank_base));
 
                 irq_set_chained_handler_and_data(pctl->irq[i],
                                                  sunxi_pinctrl_irq_handler,
diff --git a/drivers/pinctrl/sunxi/pinctrl-sunxi.h b/drivers/pinctrl/sunxi/pinctrl-sunxi.h
index e248e81a0f9e..0afce1ab12d0 100644
--- a/drivers/pinctrl/sunxi/pinctrl-sunxi.h
+++ b/drivers/pinctrl/sunxi/pinctrl-sunxi.h
@@ -97,6 +97,7 @@ struct sunxi_pinctrl_desc {
         int                             npins;
         unsigned                        pin_base;
         unsigned                        irq_banks;
+        unsigned                        irq_bank_base;
         bool                            irq_read_needs_mux;
 };
 
@@ -233,12 +234,12 @@ static inline u32 sunxi_pull_offset(u16 pin)
         return pin_num * PULL_PINS_BITS;
 }
 
-static inline u32 sunxi_irq_cfg_reg(u16 irq)
+static inline u32 sunxi_irq_cfg_reg(u16 irq, unsigned bank_base)
 {
         u8 bank = irq / IRQ_PER_BANK;
         u8 reg = (irq % IRQ_PER_BANK) / IRQ_CFG_IRQ_PER_REG * 0x04;
 
-        return IRQ_CFG_REG + bank * IRQ_MEM_SIZE + reg;
+        return IRQ_CFG_REG + (bank_base + bank) * IRQ_MEM_SIZE + reg;
 }
 
 static inline u32 sunxi_irq_cfg_offset(u16 irq)
@@ -247,16 +248,16 @@ static inline u32 sunxi_irq_cfg_offset(u16 irq)
         return irq_num * IRQ_CFG_IRQ_BITS;
 }
 
-static inline u32 sunxi_irq_ctrl_reg_from_bank(u8 bank)
+static inline u32 sunxi_irq_ctrl_reg_from_bank(u8 bank, unsigned bank_base)
 {
-        return IRQ_CTRL_REG + bank * IRQ_MEM_SIZE;
+        return IRQ_CTRL_REG + (bank_base + bank) * IRQ_MEM_SIZE;
 }
 
-static inline u32 sunxi_irq_ctrl_reg(u16 irq)
+static inline u32 sunxi_irq_ctrl_reg(u16 irq, unsigned bank_base)
 {
         u8 bank = irq / IRQ_PER_BANK;
 
-        return sunxi_irq_ctrl_reg_from_bank(bank);
+        return sunxi_irq_ctrl_reg_from_bank(bank, bank_base);
 }
 
 static inline u32 sunxi_irq_ctrl_offset(u16 irq)
@@ -265,16 +266,16 @@ static inline u32 sunxi_irq_ctrl_offset(u16 irq)
         return irq_num * IRQ_CTRL_IRQ_BITS;
 }
 
-static inline u32 sunxi_irq_status_reg_from_bank(u8 bank)
+static inline u32 sunxi_irq_status_reg_from_bank(u8 bank, unsigned bank_base)
 {
-        return IRQ_STATUS_REG + bank * IRQ_MEM_SIZE;
+        return IRQ_STATUS_REG + (bank_base + bank) * IRQ_MEM_SIZE;
 }
 
-static inline u32 sunxi_irq_status_reg(u16 irq)
+static inline u32 sunxi_irq_status_reg(u16 irq, unsigned bank_base)
 {
         u8 bank = irq / IRQ_PER_BANK;
 
-        return sunxi_irq_status_reg_from_bank(bank);
+        return sunxi_irq_status_reg_from_bank(bank, bank_base);
 }
 
 static inline u32 sunxi_irq_status_offset(u16 irq)