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authorDavid Wu <david.wu@rock-chips.com>2017-05-26 10:20:20 +0300
committerLinus Walleij <linus.walleij@linaro.org>2017-05-29 15:24:37 +0300
commitbd35b9bf8284338db35b3ff0d391b95d67b90444 (patch)
tree9601c54f70296d98e6bcbf47abfe8219fa53b561 /drivers/pinctrl/pinctrl-rockchip.c
parentc504985e3be8ab4d232d7ff63e773948e06f2da6 (diff)
downloadlinux-bd35b9bf8284338db35b3ff0d391b95d67b90444.tar.xz
pinctrl: rockchip: Add iomux-route switching support
On the some rockchip SOCS, some things like rk3399 specific uart2 can use multiple pins. Somewhere between the pin io-cells and the uart it seems to have some sort of switch to decide to which pin to actually route the data. +-------+ +--------+ /- GPIO4_B0 (pinmux 2) | uart2 | -- | switch | --- GPIO4_C0 (pinmux 2) +-------+ +--------+ \- GPIO4_C3 (pinmux 2) (switch selects one of the 3 pins base on the GRF_SOC_CON7[BIT0, BIT1]) The routing switch is determined by one pin of a specific group to be set to its special pinmux function. If the pinmux setting is wrong for that pin the ip block won't work correctly anyway. Signed-off-by: David Wu <david.wu@rock-chips.com> Reviewed-by: Heiko Stuebner <heiko@sntech.de> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/pinctrl/pinctrl-rockchip.c')
-rw-r--r--drivers/pinctrl/pinctrl-rockchip.c65
1 files changed, 64 insertions, 1 deletions
diff --git a/drivers/pinctrl/pinctrl-rockchip.c b/drivers/pinctrl/pinctrl-rockchip.c
index 5b4e1c4447fb..b53a87c2fd87 100644
--- a/drivers/pinctrl/pinctrl-rockchip.c
+++ b/drivers/pinctrl/pinctrl-rockchip.c
@@ -146,6 +146,7 @@ struct rockchip_drv {
* @irq_lock: bus lock for irq chip
* @new_irqs: newly configured irqs which must be muxed as GPIOs in
* irq_bus_sync_unlock()
+ * @route_mask: bits describing the routing pins of per bank
*/
struct rockchip_pin_bank {
void __iomem *reg_base;
@@ -170,6 +171,7 @@ struct rockchip_pin_bank {
u32 toggle_edge_mode;
struct mutex irq_lock;
u32 new_irqs;
+ u32 route_mask;
};
#define PIN_BANK(id, pins, label) \
@@ -293,6 +295,22 @@ struct rockchip_pin_bank {
}
/**
+ * struct rockchip_mux_recalced_data: represent a pin iomux data.
+ * @bank_num: bank number.
+ * @pin: index at register or used to calc index.
+ * @func: the min pin.
+ * @route_offset: the max pin.
+ * @route_val: the register offset.
+ */
+struct rockchip_mux_route_data {
+ u8 bank_num;
+ u8 pin;
+ u8 func;
+ u32 route_offset;
+ u32 route_val;
+};
+
+/**
*/
struct rockchip_pin_ctrl {
struct rockchip_pin_bank *pin_banks;
@@ -304,6 +322,8 @@ struct rockchip_pin_ctrl {
int pmu_mux_offset;
int grf_drv_offset;
int pmu_drv_offset;
+ struct rockchip_mux_route_data *iomux_routes;
+ u32 niomux_routes;
void (*pull_calc_reg)(struct rockchip_pin_bank *bank,
int pin_num, struct regmap **regmap,
@@ -585,6 +605,30 @@ static void rk3328_recalc_mux(u8 bank_num, int pin, int *reg,
*bit = data->bit;
}
+static bool rockchip_get_mux_route(struct rockchip_pin_bank *bank, int pin,
+ int mux, u32 *reg, u32 *value)
+{
+ struct rockchip_pinctrl *info = bank->drvdata;
+ struct rockchip_pin_ctrl *ctrl = info->ctrl;
+ struct rockchip_mux_route_data *data;
+ int i;
+
+ for (i = 0; i < ctrl->niomux_routes; i++) {
+ data = &ctrl->iomux_routes[i];
+ if ((data->bank_num == bank->bank_num) &&
+ (data->pin == pin) && (data->func == mux))
+ break;
+ }
+
+ if (i >= ctrl->niomux_routes)
+ return false;
+
+ *reg = data->route_offset;
+ *value = data->route_val;
+
+ return true;
+}
+
static int rockchip_get_mux(struct rockchip_pin_bank *bank, int pin)
{
struct rockchip_pinctrl *info = bank->drvdata;
@@ -683,7 +727,7 @@ static int rockchip_set_mux(struct rockchip_pin_bank *bank, int pin, int mux)
struct regmap *regmap;
int reg, ret, mask, mux_type;
u8 bit;
- u32 data, rmask;
+ u32 data, rmask, route_reg, route_val;
ret = rockchip_verify_mux(bank, pin, mux);
if (ret < 0)
@@ -719,6 +763,15 @@ static int rockchip_set_mux(struct rockchip_pin_bank *bank, int pin, int mux)
if (ctrl->iomux_recalc && (mux_type & IOMUX_RECALCED))
ctrl->iomux_recalc(bank->bank_num, pin, &reg, &bit, &mask);
+ if (bank->route_mask & BIT(pin)) {
+ if (rockchip_get_mux_route(bank, pin, mux, &route_reg,
+ &route_val)) {
+ ret = regmap_write(regmap, route_reg, route_val);
+ if (ret)
+ return ret;
+ }
+ }
+
data = (mask << (bit + 16));
rmask = data | (data >> 16);
data |= (mux & mask) << bit;
@@ -2585,6 +2638,16 @@ static struct rockchip_pin_ctrl *rockchip_pinctrl_get_soc_data(
bank_pins += 8;
}
+
+ /* calculate the per-bank route_mask */
+ for (j = 0; j < ctrl->niomux_routes; j++) {
+ int pin = 0;
+
+ if (ctrl->iomux_routes[j].bank_num == bank->bank_num) {
+ pin = ctrl->iomux_routes[j].pin;
+ bank->route_mask |= BIT(pin);
+ }
+ }
}
return ctrl;