[PATCH v4 1/2] pinctrl: rockchip: add support for the rk3399

David Wu
2016-01-30T12:20:12Z

The pinctrl of rk3399 is much different from other's,
especially the 3bits of drive strength.

Signed-off-by: David Wu <david.wu@rock-chips.com>
---
Change in v4: None

Change in v3:
- use switch-case to distinguish special 3bits width per pin (Heiko)

Change in v2:
- need spin_unlock_irqrestore for set drive default case

drivers/pinctrl/pinctrl-rockchip.c | 372 +++++++++++++++++++++++++++++++++++--
1 file changed, 358 insertions(+), 14 deletions(-)

diff --git a/drivers/pinctrl/pinctrl-rockchip.c b/drivers/pinctrl/pinctrl-rockchip.c
index a065112..d5c71b0 100644
--- a/drivers/pinctrl/pinctrl-rockchip.c
+++ b/drivers/pinctrl/pinctrl-rockchip.c
@@ -64,6 +64,7 @@ enum rockchip_pinctrl_type {
RK3188,
RK3288,
RK3368,
+ RK3399,
};

/**
@@ -86,6 +87,31 @@ struct rockchip_iomux {
};

/**
+ * enum type index corresponding to rockchip_perpin_drv_list arrays index.
+ */
+enum rockchip_pin_drv_type {
+ DRV_TYPE_IO_DEFAULT = 0,
+ DRV_TYPE_IO_1V8_OR_3V0,
+ DRV_TYPE_IO_1V8_ONLY,
+ DRV_TYPE_IO_1V8_3V0_AUTO,
+ DRV_TYPE_IO_3V3_ONLY,
+ DRV_TYPE_MAX
+};
+
+/**
+ * @drv_type: drive strength variant using rockchip_perpin_drv_type
+ * @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 drive strength
+ * registers. if used chips own cal_drv func instead to calculate
+ * registers offset, the variant could be ignored.
+ */
+struct rockchip_drv {
+ enum rockchip_pin_drv_type drv_type;
+ int offset;
+};
+
+/**
* @reg_base: register base of the gpio bank
* @reg_pull: optional separate register for additional pull settings
* @clk: clock of the gpio bank
@@ -96,6 +122,7 @@ struct rockchip_iomux {
* @name: name of the bank
* @bank_num: number of the bank, to account for holes
* @iomux: array describing the 4 iomux sources of the bank
+ * @drv: array describing the 4 drive strength sources of the bank
* @valid: are all necessary informations present
* @of_node: dt node of this bank
* @drvdata: common pinctrl basedata
@@ -115,6 +142,7 @@ struct rockchip_pin_bank {
char *name;
u8 bank_num;
struct rockchip_iomux iomux[4];
+ struct rockchip_drv drv[4];
bool valid;
struct device_node *of_node;
struct rockchip_pinctrl *drvdata;
@@ -151,6 +179,47 @@ struct rockchip_pin_bank {
}, \
}

+#define PIN_BANK_DRV_FLAGS(id, pins, label, type0, type1, type2, type3) \
+ { \
+ .bank_num = id, \
+ .nr_pins = pins, \
+ .name = label, \
+ .iomux = { \
+ { .offset = -1 }, \
+ { .offset = -1 }, \
+ { .offset = -1 }, \
+ { .offset = -1 }, \
+ }, \
+ .drv = { \
+ { .drv_type = type0, .offset = -1 }, \
+ { .drv_type = type1, .offset = -1 }, \
+ { .drv_type = type2, .offset = -1 }, \
+ { .drv_type = type3, .offset = -1 }, \
+ }, \
+ }
+
+#define PIN_BANK_IOMUX_DRV_FLAGS_OFFSET(id, pins, label, iom0, iom1, \
+ iom2, iom3, drv0, drv1, drv2, \
+ drv3, offset0, offset1, \
+ offset2, offset3) \
+ { \
+ .bank_num = id, \
+ .nr_pins = pins, \
+ .name = label, \
+ .iomux = { \
+ { .type = iom0, .offset = -1 }, \
+ { .type = iom1, .offset = -1 }, \
+ { .type = iom2, .offset = -1 }, \
+ { .type = iom3, .offset = -1 }, \
+ }, \
+ .drv = { \
+ { .drv_type = drv0, .offset = offset0 }, \
+ { .drv_type = drv1, .offset = offset1 }, \
+ { .drv_type = drv2, .offset = offset2 }, \
+ { .drv_type = drv3, .offset = offset3 }, \
+ }, \
+ }
+
/**
*/
struct rockchip_pin_ctrl {
@@ -161,6 +230,9 @@ struct rockchip_pin_ctrl {
enum rockchip_pinctrl_type type;
int grf_mux_offset;
int pmu_mux_offset;
+ int grf_drv_offset;
+ int pmu_drv_offset;
+
void (*pull_calc_reg)(struct rockchip_pin_bank *bank,
int pin_num, struct regmap **regmap,
int *reg, u8 *bit);
@@ -676,7 +748,68 @@ static void rk3368_calc_drv_reg_and_bit(struct rockchip_pin_bank *bank,
}
}

-static int rockchip_perpin_drv_list[] = { 2, 4, 8, 12 };
+#define RK3399_PULL_GRF_OFFSET 0xe040
+#define RK3399_PULL_PMU_OFFSET 0x40
+#define RK3399_DRV_3BITS_PER_PIN 3
+
+static void rk3399_calc_pull_reg_and_bit(struct rockchip_pin_bank *bank,
+ int pin_num, struct regmap **regmap,
+ int *reg, u8 *bit)
+{
+ struct rockchip_pinctrl *info = bank->drvdata;
+
+ /* The bank0:16 and bank1:32 pins are located in PMU */
+ if ((bank->bank_num == 0) || (bank->bank_num == 1)) {
+ *regmap = info->regmap_pmu;
+ *reg = RK3399_PULL_PMU_OFFSET;
+
+ *reg += bank->bank_num * RK3188_PULL_BANK_STRIDE;
+
+ *reg += ((pin_num / RK3188_PULL_PINS_PER_REG) * 4);
+ *bit = pin_num % RK3188_PULL_PINS_PER_REG;
+ *bit *= RK3188_PULL_BITS_PER_PIN;
+ } else {
+ *regmap = info->regmap_base;
+ *reg = RK3399_PULL_GRF_OFFSET;
+
+ /* correct the offset, as we're starting with the 3rd bank */
+ *reg -= 0x20;
+ *reg += bank->bank_num * RK3188_PULL_BANK_STRIDE;
+ *reg += ((pin_num / RK3188_PULL_PINS_PER_REG) * 4);
+
+ *bit = (pin_num % RK3188_PULL_PINS_PER_REG);
+ *bit *= RK3188_PULL_BITS_PER_PIN;
+ }
+}
+
+static void rk3399_calc_drv_reg_and_bit(struct rockchip_pin_bank *bank,
+ int pin_num, struct regmap **regmap,
+ int *reg, u8 *bit)
+{
+ struct rockchip_pinctrl *info = bank->drvdata;
+ int drv_num = (pin_num / 8);
+
+ /* The bank0:16 and bank1:32 pins are located in PMU */
+ if ((bank->bank_num == 0) || (bank->bank_num == 1))
+ *regmap = info->regmap_pmu;
+ else
+ *regmap = info->regmap_base;
+
+ *reg = bank->drv[drv_num].offset;
+ if ((bank->drv[drv_num].drv_type == DRV_TYPE_IO_1V8_3V0_AUTO) ||
+ (bank->drv[drv_num].drv_type == DRV_TYPE_IO_3V3_ONLY))
+ *bit = (pin_num % 8) * 3;
+ else
+ *bit = (pin_num % 8) * 2;
+}
+
+static int rockchip_perpin_drv_list[DRV_TYPE_MAX][8] = {
+ { 2, 4, 8, 12, -1, -1, -1, -1 },
+ { 3, 6, 9, 12, -1, -1, -1, -1 },
+ { 5, 10, 15, 20, -1, -1, -1, -1 },
+ { 4, 6, 8, 10, 12, 14, 16, 18 },
+ { 4, 7, 10, 13, 16, 19, 22, 26 }
+};

static int rockchip_get_drive_perpin(struct rockchip_pin_bank *bank,
int pin_num)
@@ -685,19 +818,74 @@ static int rockchip_get_drive_perpin(struct rockchip_pin_bank *bank,
struct rockchip_pin_ctrl *ctrl = info->ctrl;
struct regmap *regmap;
int reg, ret;
- u32 data;
+ u32 data, temp, rmask_bits;
u8 bit;
+ int drv_type = bank->drv[pin_num / 8].drv_type;

ctrl->drv_calc_reg(bank, pin_num, &regmap, &reg, &bit);

+ switch (drv_type) {
+ case DRV_TYPE_IO_1V8_3V0_AUTO:
+ case DRV_TYPE_IO_3V3_ONLY:
+ rmask_bits = RK3399_DRV_3BITS_PER_PIN;
+ switch (bit) {
+ case 0 ... 12:
+ /* regular case, nothing to do */
+ break;
+ case 15:
+ /*
+ * drive-strength offset is special, as it is
+ * spread over 2 registers
+ */
+ ret = regmap_read(regmap, reg, &data);
+ if (ret)
+ return ret;
+
+ ret = regmap_read(regmap, reg + 0x4, &temp);
+ if (ret)
+ return ret;
+
+ /*
+ * the bit data[15] contains bit 0 of the value
+ * while temp[1:0] contains bits 2 and 1
+ */
+ data >>= 15;
+ temp &= 0x3;
+ temp <<= 1;
+ data |= temp;
+
+ return rockchip_perpin_drv_list[drv_type][data];
+ case 18 ... 21:
+ /* setting fully enclosed in the second register */
+ reg += 4;
+ bit -= 16;
+ break;
+ default:
+ dev_err(info->dev, "unsupported bit: %d for pinctrl drive type: %d\n",
+ bit, drv_type);
+ return -EINVAL;
+ }
+
+ break;
+ case DRV_TYPE_IO_DEFAULT:
+ case DRV_TYPE_IO_1V8_OR_3V0:
+ case DRV_TYPE_IO_1V8_ONLY:
+ rmask_bits = RK3288_DRV_BITS_PER_PIN;
+ break;
+ default:
+ dev_err(info->dev, "unsupported pinctrl drive type: %d\n",
+ drv_type);
+ return -EINVAL;
+ }
+
ret = regmap_read(regmap, reg, &data);
if (ret)
return ret;

data >>= bit;
- data &= (1 << RK3288_DRV_BITS_PER_PIN) - 1;
+ data &= (1 << rmask_bits) - 1;

- return rockchip_perpin_drv_list[data];
+ return rockchip_perpin_drv_list[drv_type][data];
}

static int rockchip_set_drive_perpin(struct rockchip_pin_bank *bank,
@@ -708,16 +896,23 @@ static int rockchip_set_drive_perpin(struct rockchip_pin_bank *bank,
struct regmap *regmap;
unsigned long flags;
int reg, ret, i;
- u32 data, rmask;
+ u32 data, rmask, rmask_bits, temp;
u8 bit;
+ int drv_type = bank->drv[pin_num / 8].drv_type;
+
+ dev_dbg(info->dev, "setting drive of GPIO%d-%d to %d\n",
+ bank->bank_num, pin_num, strength);

ctrl->drv_calc_reg(bank, pin_num, &regmap, &reg, &bit);

ret = -EINVAL;
- for (i = 0; i < ARRAY_SIZE(rockchip_perpin_drv_list); i++) {
- if (rockchip_perpin_drv_list[i] == strength) {
+ for (i = 0; i < ARRAY_SIZE(rockchip_perpin_drv_list[drv_type]); i++) {
+ if (rockchip_perpin_drv_list[drv_type][i] == strength) {
ret = i;
break;
+ } else if (rockchip_perpin_drv_list[drv_type][i] < 0) {
+ ret = rockchip_perpin_drv_list[drv_type][i];
+ break;
}
}

@@ -729,8 +924,67 @@ static int rockchip_set_drive_perpin(struct rockchip_pin_bank *bank,

spin_lock_irqsave(&bank->slock, flags);

+ switch (drv_type) {
+ case DRV_TYPE_IO_1V8_3V0_AUTO:
+ case DRV_TYPE_IO_3V3_ONLY:
+ rmask_bits = RK3399_DRV_3BITS_PER_PIN;
+ switch (bit) {
+ case 0 ... 12:
+ /* regular case, nothing to do */
+ break;
+ case 15:
+ /*
+ * the bit data[15] contains bit 0 of the value
+ * while temp[1:0] contains bits 2 and 1
+ */
+ data = (ret & 0x1) << 15;
+ temp = (ret >> 0x1) & 0x3;
+
+ rmask = BIT(15) | BIT(31);
+ data |= BIT(31);
+ ret = regmap_update_bits(regmap, reg, rmask, data);
+ if (ret) {
+ spin_unlock_irqrestore(&bank->slock, flags);
+ return ret;
+ }
+
+ /*
+ * drive-strength offset is special, as it is
+ * spread over 2 registers
+ */
+ rmask = 0x3 | (0x3 << 16);
+ temp |= (0x3 << 16);
+ reg += 0x4;
+ ret = regmap_update_bits(regmap, reg, rmask, temp);
+
+ spin_unlock_irqrestore(&bank->slock, flags);
+ return ret;
+ case 18 ... 21:
+ /* setting fully enclosed in the second register */
+ reg += 4;
+ bit -= 16;
+ break;
+ default:
+ spin_unlock_irqrestore(&bank->slock, flags);
+ dev_err(info->dev, "unsupported bit: %d for pinctrl drive type: %d\n",
+ bit, drv_type);
+ return -EINVAL;
+ }
+ break;
+ case DRV_TYPE_IO_DEFAULT:
+ case DRV_TYPE_IO_1V8_OR_3V0:
+ case DRV_TYPE_IO_1V8_ONLY:
+ rmask_bits = RK3288_DRV_BITS_PER_PIN;
+ break;
+ default:
+ spin_unlock_irqrestore(&bank->slock, flags);
+ dev_err(info->dev, "unsupported pinctrl drive type: %d\n",
+ drv_type);
+ return -EINVAL;
+ }
+
/* enable the write to the equivalent lower bits */
- data = ((1 << RK3288_DRV_BITS_PER_PIN) - 1) << (bit + 16);
+ data = ((1 << rmask_bits) - 1) << (bit + 16);
rmask = data | (data >> 16);
data |= (ret << bit);

@@ -767,6 +1021,7 @@ static int rockchip_get_pull(struct rockchip_pin_bank *bank, int pin_num)
case RK3188:
case RK3288:
case RK3368:
+ case RK3399:
data >>= bit;
data &= (1 << RK3188_PULL_BITS_PER_PIN) - 1;

@@ -823,6 +1078,7 @@ static int rockchip_set_pull(struct rockchip_pin_bank *bank,
case RK3188:
case RK3288:
case RK3368:
+ case RK3399:
spin_lock_irqsave(&bank->slock, flags);

/* enable the write to the equivalent lower bits */
@@ -1003,6 +1259,7 @@ static bool rockchip_pinconf_pull_valid(struct rockchip_pin_ctrl *ctrl,
case RK3188:
case RK3288:
case RK3368:
+ case RK3399:
return (pull != PIN_CONFIG_BIAS_PULL_PIN_DEFAULT);
}

@@ -1860,7 +2117,7 @@ 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, pmu_offs, i, j;
+ int grf_offs, pmu_offs, drv_grf_offs, drv_pmu_offs, i, j;

match = of_match_node(rockchip_pinctrl_dt_match, node);
ctrl = (struct rockchip_pin_ctrl *)match->data;
@@ -1884,6 +2141,8 @@ static struct rockchip_pin_ctrl *rockchip_pinctrl_get_soc_data(

grf_offs = ctrl->grf_mux_offset;
pmu_offs = ctrl->pmu_mux_offset;
+ drv_pmu_offs = ctrl->pmu_drv_offset;
+ drv_grf_offs = ctrl->grf_drv_offset;
bank = ctrl->pin_banks;
for (i = 0; i < ctrl->nr_banks; ++i, ++bank) {
int bank_pins = 0;
@@ -1893,27 +2152,39 @@ static struct rockchip_pin_ctrl *rockchip_pinctrl_get_soc_data(
bank->pin_base = ctrl->nr_pins;
ctrl->nr_pins += bank->nr_pins;

- /* calculate iomux offsets */
+ /* calculate iomux and drv offsets */
for (j = 0; j < 4; j++) {
struct rockchip_iomux *iom = &bank->iomux[j];
+ struct rockchip_drv *drv = &bank->drv[j];
int inc;

if (bank_pins >= bank->nr_pins)
break;

- /* preset offset value, set new start value */
+ /* preset iomux offset value, set new start value */
if (iom->offset >= 0) {
if (iom->type & IOMUX_SOURCE_PMU)
pmu_offs = iom->offset;
else
grf_offs = iom->offset;
- } else { /* set current offset */
+ } else { /* set current iomux offset */
iom->offset = (iom->type & IOMUX_SOURCE_PMU) ?
pmu_offs : grf_offs;
}

- dev_dbg(d->dev, "bank %d, iomux %d has offset 0x%x\n",
- i, j, iom->offset);
+ /* preset drv offset value, set new start value */
+ if (drv->offset >= 0) {
+ if (iom->type & IOMUX_SOURCE_PMU)
+ drv_pmu_offs = drv->offset;
+ else
+ drv_grf_offs = drv->offset;
+ } else { /* set current drv offset */
+ drv->offset = (iom->type & IOMUX_SOURCE_PMU) ?
+ drv_pmu_offs : drv_grf_offs;
+ }
+
+ dev_dbg(d->dev, "bank %d, iomux %d has iom_offset 0x%x drv_offset 0x%x\n",
+ i, j, iom->offset, drv->offset);

/*
* Increase offset according to iomux width.
@@ -1925,6 +2196,21 @@ static struct rockchip_pin_ctrl *rockchip_pinctrl_get_soc_data(
else
grf_offs += inc;

+ /*
+ * Increase offset according to drv width.
+ * 3bit drive-strenth'es are spread over two registers.
+ */
+ if ((drv->drv_type == DRV_TYPE_IO_1V8_3V0_AUTO) ||
+ (drv->drv_type == DRV_TYPE_IO_3V3_ONLY))
+ inc = 8;
+ else
+ inc = 4;
+
+ if (iom->type & IOMUX_SOURCE_PMU)
+ drv_pmu_offs += inc;
+ else
+ drv_grf_offs += inc;
+
bank_pins += 8;
}
}
@@ -2208,6 +2494,62 @@ static struct rockchip_pin_ctrl rk3368_pin_ctrl = {
.drv_calc_reg = rk3368_calc_drv_reg_and_bit,
};

+static struct rockchip_pin_bank rk3399_pin_banks[] = {
+ PIN_BANK_IOMUX_DRV_FLAGS_OFFSET(0, 32, "gpio0", IOMUX_SOURCE_PMU,
+ IOMUX_SOURCE_PMU,
+ IOMUX_SOURCE_PMU,
+ IOMUX_SOURCE_PMU,
+ DRV_TYPE_IO_1V8_ONLY,
+ DRV_TYPE_IO_1V8_ONLY,
+ DRV_TYPE_IO_DEFAULT,
+ DRV_TYPE_IO_DEFAULT,
+ 0x0,
+ 0x8,
+ -1,
+ -1
+ ),
+ PIN_BANK_IOMUX_DRV_FLAGS_OFFSET(1, 32, "gpio1", IOMUX_SOURCE_PMU,
+ IOMUX_SOURCE_PMU,
+ IOMUX_SOURCE_PMU,
+ IOMUX_SOURCE_PMU,
+ DRV_TYPE_IO_1V8_OR_3V0,
+ DRV_TYPE_IO_1V8_OR_3V0,
+ DRV_TYPE_IO_1V8_OR_3V0,
+ DRV_TYPE_IO_1V8_OR_3V0,
+ 0x20,
+ 0x28,
+ 0x30,
+ 0x38
+ ),
+ PIN_BANK_DRV_FLAGS(2, 32, "gpio2", DRV_TYPE_IO_1V8_OR_3V0,
+ DRV_TYPE_IO_1V8_OR_3V0,
+ DRV_TYPE_IO_1V8_ONLY,
+ DRV_TYPE_IO_1V8_ONLY
+ ),
+ PIN_BANK_DRV_FLAGS(3, 32, "gpio3", DRV_TYPE_IO_3V3_ONLY,
+ DRV_TYPE_IO_3V3_ONLY,
+ DRV_TYPE_IO_3V3_ONLY,
+ DRV_TYPE_IO_1V8_OR_3V0
+ ),
+ PIN_BANK_DRV_FLAGS(4, 32, "gpio4", DRV_TYPE_IO_1V8_OR_3V0,
+ DRV_TYPE_IO_1V8_3V0_AUTO,
+ DRV_TYPE_IO_1V8_OR_3V0,
+ DRV_TYPE_IO_1V8_OR_3V0
+ ),
+};
+
+static struct rockchip_pin_ctrl rk3399_pin_ctrl = {
+ .pin_banks = rk3399_pin_banks,
+ .nr_banks = ARRAY_SIZE(rk3399_pin_banks),
+ .label = "RK3399-GPIO",
+ .type = RK3399,
+ .grf_mux_offset = 0xe000,
+ .pmu_mux_offset = 0x0,
+ .grf_drv_offset = 0xe100,
+ .pmu_drv_offset = 0x80,
+ .pull_calc_reg = rk3399_calc_pull_reg_and_bit,
+ .drv_calc_reg = rk3399_calc_drv_reg_and_bit,
+};

static const struct of_device_id rockchip_pinctrl_dt_match[] = {
{ .compatible = "rockchip,rk2928-pinctrl",
@@ -2224,6 +2566,8 @@ static const struct of_device_id rockchip_pinctrl_dt_match[] = {
.data = (void *)&rk3288_pin_ctrl },
{ .compatible = "rockchip,rk3368-pinctrl",
.data = (void *)&rk3368_pin_ctrl },
+ { .compatible = "rockchip,rk3399-pinctrl",
+ .data = (void *)&rk3399_pin_ctrl },
{},
};
MODULE_DEVICE_TABLE(of, rockchip_pinctrl_dt_match);
--
1.9.1