pinctrl: rockchip: precalculate iomux offsets
An upcoming SoC introduces an interesting quirk to iomux handling making the
calculation of the iomux register-offset harder. To keep the complexity down
when getting/setting the mux, precalculate the actual register offset at
probe-time.
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/drivers/pinctrl/pinctrl-rockchip.c b/drivers/pinctrl/pinctrl-rockchip.c
index 2f5ba04..202ac82 100644
--- a/drivers/pinctrl/pinctrl-rockchip.c
+++ b/drivers/pinctrl/pinctrl-rockchip.c
@@ -71,9 +71,13 @@
/**
* @type: iomux variant using IOMUX_* constants
+ * @offset: if initialized to -1 it will be autocalculated, by specifying
+ * an initial offset value the relevant source offset can be reset
+ * to a new value for autocalculating the following iomux registers.
*/
struct rockchip_iomux {
int type;
+ int offset;
};
/**
@@ -119,6 +123,12 @@
.bank_num = id, \
.nr_pins = pins, \
.name = label, \
+ .iomux = { \
+ { .offset = -1 }, \
+ { .offset = -1 }, \
+ { .offset = -1 }, \
+ { .offset = -1 }, \
+ }, \
}
#define PIN_BANK_IOMUX_FLAGS(id, pins, label, iom0, iom1, iom2, iom3) \
@@ -127,10 +137,10 @@
.nr_pins = pins, \
.name = label, \
.iomux = { \
- { .type = iom0, }, \
- { .type = iom1, }, \
- { .type = iom2, }, \
- { .type = iom3, }, \
+ { .type = iom0, .offset = -1 }, \
+ { .type = iom1, .offset = -1 }, \
+ { .type = iom2, .offset = -1 }, \
+ { .type = iom3, .offset = -1 }, \
}, \
}
@@ -376,9 +386,7 @@
return RK_FUNC_GPIO;
/* get basic quadrupel of mux registers and the correct reg inside */
- reg = info->ctrl->mux_offset;
- reg += bank->bank_num * 0x10;
- reg += iomux_num * 4;
+ reg = bank->iomux[iomux_num].offset;
bit = (pin % 8) * 2;
ret = regmap_read(info->regmap_base, reg, &val);
@@ -427,9 +435,7 @@
bank->bank_num, pin, mux);
/* get basic quadrupel of mux registers and the correct reg inside */
- reg = info->ctrl->mux_offset;
- reg += bank->bank_num * 0x10;
- reg += iomux_num * 4;
+ reg = bank->iomux[iomux_num].offset;
bit = (pin % 8) * 2;
spin_lock_irqsave(&bank->slock, flags);
@@ -1515,7 +1521,7 @@
struct device_node *np;
struct rockchip_pin_ctrl *ctrl;
struct rockchip_pin_bank *bank;
- int i;
+ int grf_offs, i, j;
match = of_match_node(rockchip_pinctrl_dt_match, node);
ctrl = (struct rockchip_pin_ctrl *)match->data;
@@ -1537,12 +1543,40 @@
}
}
+ grf_offs = ctrl->mux_offset;
bank = ctrl->pin_banks;
for (i = 0; i < ctrl->nr_banks; ++i, ++bank) {
+ int bank_pins = 0;
+
spin_lock_init(&bank->slock);
bank->drvdata = d;
bank->pin_base = ctrl->nr_pins;
ctrl->nr_pins += bank->nr_pins;
+
+ /* calculate iomux offsets */
+ for (j = 0; j < 4; j++) {
+ struct rockchip_iomux *iom = &bank->iomux[j];
+
+ if (bank_pins >= bank->nr_pins)
+ break;
+
+ /* preset offset value, set new start value */
+ if (iom->offset >= 0) {
+ grf_offs = iom->offset;
+ } else { /* set current offset */
+ iom->offset = grf_offs;
+ }
+
+ dev_dbg(d->dev, "bank %d, iomux %d has offset 0x%x\n",
+ i, j, iom->offset);
+
+ /*
+ * Increase offset according to iomux width.
+ */
+ grf_offs += 4;
+
+ bank_pins += 8;
+ }
}
return ctrl;
