pinctrl: rockchip: precalculate iomux offsets
From: Heiko Stuebner <heiko@...> Date: Mon, 9 Jun 2014 10:34:19 +0200
Commit-Message
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@...>
Patch-Comment
drivers/pinctrl/pinctrl-rockchip.c | 56 ++++++++++++++++++++++++++++++-------- 1 file changed, 45 insertions(+), 11 deletions(-)
Statistics
- 45 lines added
- 11 lines removed
Changes
---------------------- drivers/pinctrl/pinctrl-rockchip.c ----------------------
index 2296765..2765bb2 100644
@@ -71,9 +71,13 @@ enum rockchip_pinctrl_type {
/**
* @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 @@ struct rockchip_pin_bank {
.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 @@ struct rockchip_pin_bank {
.nr_pins = pins, \
.name = label, \
.iomux = { \
+ { .type = iom0, .offset = -1 }, \
+ { .type = iom1, .offset = -1 }, \
+ { .type = iom2, .offset = -1 }, \
+ { .type = iom3, .offset = -1 }, \
}, \
}
@@ -376,9 +386,7 @@ static int rockchip_get_mux(struct rockchip_pin_bank *bank, int pin)
return RK_FUNC_GPIO;
/* get basic quadrupel of mux registers and the correct reg inside */
+ reg = bank->iomux[iomux_num].offset;
bit = (pin % 8) * 2;
ret = regmap_read(info->regmap_base, reg, &val);
@@ -427,9 +435,7 @@ static int rockchip_set_mux(struct rockchip_pin_bank *bank, int pin, int mux)
bank->bank_num, pin, mux);
/* get basic quadrupel of mux registers and the correct reg inside */
+ reg = bank->iomux[iomux_num].offset;
bit = (pin % 8) * 2;
spin_lock_irqsave(&bank->slock, flags);
@@ -1532,7 +1538,7 @@ static struct rockchip_pin_ctrl *rockchip_pinctrl_get_soc_data(
struct device_node *np;
struct rockchip_pin_ctrl *ctrl;
struct rockchip_pin_bank *bank;
+ int grf_offs, i, j;
match = of_match_node(rockchip_pinctrl_dt_match, node);
ctrl = (struct rockchip_pin_ctrl *)match->data;
@@ -1554,12 +1560,40 @@ static struct rockchip_pin_ctrl *rockchip_pinctrl_get_soc_data(
}
}
+ 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;