diff options
Diffstat (limited to 'drivers/pinctrl/pinctrl-rza1.c')
| -rw-r--r-- | drivers/pinctrl/pinctrl-rza1.c | 1311 |
1 files changed, 1311 insertions, 0 deletions
diff --git a/drivers/pinctrl/pinctrl-rza1.c b/drivers/pinctrl/pinctrl-rza1.c new file mode 100644 index 000000000000..614a043f3038 --- /dev/null +++ b/drivers/pinctrl/pinctrl-rza1.c @@ -0,0 +1,1311 @@ +/* + * Combined GPIO and pin controller support for Renesas RZ/A1 (r7s72100) SoC + * + * Copyright (C) 2017 Jacopo Mondi + * + * This file is licensed under the terms of the GNU General Public + * License version 2. This program is licensed "as is" without any + * warranty of any kind, whether express or implied. + */ + +/* + * This pin controller/gpio combined driver supports Renesas devices of RZ/A1 + * family. + * This includes SoCs which are sub- or super- sets of this particular line, + * as RZ/A1H (r7s721000), RZ/A1M (r7s721010) and RZ/A1L (r7s721020). + */ + +#include <linux/bitops.h> +#include <linux/err.h> +#include <linux/gpio/driver.h> +#include <linux/init.h> +#include <linux/ioport.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_address.h> +#include <linux/of_device.h> +#include <linux/pinctrl/pinconf-generic.h> +#include <linux/pinctrl/pinctrl.h> +#include <linux/pinctrl/pinmux.h> +#include <linux/slab.h> + +#include "core.h" +#include "devicetree.h" +#include "pinconf.h" +#include "pinmux.h" + +#define DRIVER_NAME "pinctrl-rza1" + +#define RZA1_P_REG 0x0000 +#define RZA1_PPR_REG 0x0200 +#define RZA1_PM_REG 0x0300 +#define RZA1_PMC_REG 0x0400 +#define RZA1_PFC_REG 0x0500 +#define RZA1_PFCE_REG 0x0600 +#define RZA1_PFCEA_REG 0x0a00 +#define RZA1_PIBC_REG 0x4000 +#define RZA1_PBDC_REG 0x4100 +#define RZA1_PIPC_REG 0x4200 + +#define RZA1_ADDR(mem, reg, port) ((mem) + (reg) + ((port) * 4)) + +#define RZA1_NPORTS 12 +#define RZA1_PINS_PER_PORT 16 +#define RZA1_NPINS (RZA1_PINS_PER_PORT * RZA1_NPORTS) +#define RZA1_PIN_ID_TO_PORT(id) ((id) / RZA1_PINS_PER_PORT) +#define RZA1_PIN_ID_TO_PIN(id) ((id) % RZA1_PINS_PER_PORT) + +/* + * Use 16 lower bits [15:0] for pin identifier + * Use 16 higher bits [31:16] for pin mux function + */ +#define MUX_PIN_ID_MASK GENMASK(15, 0) +#define MUX_FUNC_MASK GENMASK(31, 16) + +#define MUX_FUNC_OFFS 16 +#define MUX_FUNC(pinconf) \ + ((pinconf & MUX_FUNC_MASK) >> MUX_FUNC_OFFS) +#define MUX_FUNC_PFC_MASK BIT(0) +#define MUX_FUNC_PFCE_MASK BIT(1) +#define MUX_FUNC_PFCEA_MASK BIT(2) + +/* Pin mux flags */ +#define MUX_FLAGS_BIDIR BIT(0) +#define MUX_FLAGS_SWIO_INPUT BIT(1) +#define MUX_FLAGS_SWIO_OUTPUT BIT(2) + +/* ---------------------------------------------------------------------------- + * RZ/A1 pinmux flags + */ + +/** + * rza1_bidir_pin - describe a single pin that needs bidir flag applied. + */ +struct rza1_bidir_pin { + u8 pin: 4; + u8 func: 4; +}; + +/** + * rza1_bidir_entry - describe a list of pins that needs bidir flag applied. + * Each struct rza1_bidir_entry describes a port. + */ +struct rza1_bidir_entry { + const unsigned int npins; + const struct rza1_bidir_pin *pins; +}; + +/** + * rza1_swio_pin - describe a single pin that needs bidir flag applied. + */ +struct rza1_swio_pin { + u16 pin: 4; + u16 port: 4; + u16 func: 4; + u16 input: 1; +}; + +/** + * rza1_swio_entry - describe a list of pins that needs swio flag applied + */ +struct rza1_swio_entry { + const unsigned int npins; + const struct rza1_swio_pin *pins; +}; + +/** + * rza1_pinmux_conf - group together bidir and swio pinmux flag tables + */ +struct rza1_pinmux_conf { + const struct rza1_bidir_entry *bidir_entries; + const struct rza1_swio_entry *swio_entries; +}; + +/* ---------------------------------------------------------------------------- + * RZ/A1H (r7s72100) pinmux flags + */ + +static const struct rza1_bidir_pin rza1h_bidir_pins_p1[] = { + { .pin = 0, .func = 1 }, + { .pin = 1, .func = 1 }, + { .pin = 2, .func = 1 }, + { .pin = 3, .func = 1 }, + { .pin = 4, .func = 1 }, + { .pin = 5, .func = 1 }, + { .pin = 6, .func = 1 }, + { .pin = 7, .func = 1 }, +}; + +static const struct rza1_bidir_pin rza1h_bidir_pins_p2[] = { + { .pin = 0, .func = 1 }, + { .pin = 1, .func = 1 }, + { .pin = 2, .func = 1 }, + { .pin = 3, .func = 1 }, + { .pin = 4, .func = 1 }, + { .pin = 0, .func = 4 }, + { .pin = 1, .func = 4 }, + { .pin = 2, .func = 4 }, + { .pin = 3, .func = 4 }, + { .pin = 5, .func = 1 }, + { .pin = 6, .func = 1 }, + { .pin = 7, .func = 1 }, + { .pin = 8, .func = 1 }, + { .pin = 9, .func = 1 }, + { .pin = 10, .func = 1 }, + { .pin = 11, .func = 1 }, + { .pin = 12, .func = 1 }, + { .pin = 13, .func = 1 }, + { .pin = 14, .func = 1 }, + { .pin = 15, .func = 1 }, + { .pin = 12, .func = 4 }, + { .pin = 13, .func = 4 }, + { .pin = 14, .func = 4 }, + { .pin = 15, .func = 4 }, +}; + +static const struct rza1_bidir_pin rza1h_bidir_pins_p3[] = { + { .pin = 3, .func = 2 }, + { .pin = 10, .func = 7 }, + { .pin = 11, .func = 7 }, + { .pin = 13, .func = 7 }, + { .pin = 14, .func = 7 }, + { .pin = 15, .func = 7 }, + { .pin = 10, .func = 8 }, + { .pin = 11, .func = 8 }, + { .pin = 13, .func = 8 }, + { .pin = 14, .func = 8 }, + { .pin = 15, .func = 8 }, +}; + +static const struct rza1_bidir_pin rza1h_bidir_pins_p4[] = { + { .pin = 0, .func = 8 }, + { .pin = 1, .func = 8 }, + { .pin = 2, .func = 8 }, + { .pin = 3, .func = 8 }, + { .pin = 10, .func = 3 }, + { .pin = 11, .func = 3 }, + { .pin = 13, .func = 3 }, + { .pin = 14, .func = 3 }, + { .pin = 15, .func = 3 }, + { .pin = 10, .func = 4 }, + { .pin = 11, .func = 4 }, + { .pin = 13, .func = 4 }, + { .pin = 14, .func = 4 }, + { .pin = 15, .func = 4 }, + { .pin = 12, .func = 5 }, + { .pin = 13, .func = 5 }, + { .pin = 14, .func = 5 }, + { .pin = 15, .func = 5 }, +}; + +static const struct rza1_bidir_pin rza1h_bidir_pins_p6[] = { + { .pin = 0, .func = 1 }, + { .pin = 1, .func = 1 }, + { .pin = 2, .func = 1 }, + { .pin = 3, .func = 1 }, + { .pin = 4, .func = 1 }, + { .pin = 5, .func = 1 }, + { .pin = 6, .func = 1 }, + { .pin = 7, .func = 1 }, + { .pin = 8, .func = 1 }, + { .pin = 9, .func = 1 }, + { .pin = 10, .func = 1 }, + { .pin = 11, .func = 1 }, + { .pin = 12, .func = 1 }, + { .pin = 13, .func = 1 }, + { .pin = 14, .func = 1 }, + { .pin = 15, .func = 1 }, +}; + +static const struct rza1_bidir_pin rza1h_bidir_pins_p7[] = { + { .pin = 13, .func = 3 }, +}; + +static const struct rza1_bidir_pin rza1h_bidir_pins_p8[] = { + { .pin = 8, .func = 3 }, + { .pin = 9, .func = 3 }, + { .pin = 10, .func = 3 }, + { .pin = 11, .func = 3 }, + { .pin = 14, .func = 2 }, + { .pin = 15, .func = 2 }, + { .pin = 14, .func = 3 }, + { .pin = 15, .func = 3 }, +}; + +static const struct rza1_bidir_pin rza1h_bidir_pins_p9[] = { + { .pin = 0, .func = 2 }, + { .pin = 1, .func = 2 }, + { .pin = 4, .func = 2 }, + { .pin = 5, .func = 2 }, + { .pin = 6, .func = 2 }, + { .pin = 7, .func = 2 }, +}; + +static const struct rza1_bidir_pin rza1h_bidir_pins_p11[] = { + { .pin = 6, .func = 2 }, + { .pin = 7, .func = 2 }, + { .pin = 9, .func = 2 }, + { .pin = 6, .func = 4 }, + { .pin = 7, .func = 4 }, + { .pin = 9, .func = 4 }, + { .pin = 10, .func = 2 }, + { .pin = 11, .func = 2 }, + { .pin = 10, .func = 4 }, + { .pin = 11, .func = 4 }, + { .pin = 12, .func = 4 }, + { .pin = 13, .func = 4 }, + { .pin = 14, .func = 4 }, + { .pin = 15, .func = 4 }, +}; + +static const struct rza1_swio_pin rza1h_swio_pins[] = { + { .port = 2, .pin = 7, .func = 4, .input = 0 }, + { .port = 2, .pin = 11, .func = 4, .input = 0 }, + { .port = 3, .pin = 7, .func = 3, .input = 0 }, + { .port = 3, .pin = 7, .func = 8, .input = 0 }, + { .port = 4, .pin = 7, .func = 5, .input = 0 }, + { .port = 4, .pin = 7, .func = 11, .input = 0 }, + { .port = 4, .pin = 15, .func = 6, .input = 0 }, + { .port = 5, .pin = 0, .func = 1, .input = 1 }, + { .port = 5, .pin = 1, .func = 1, .input = 1 }, + { .port = 5, .pin = 2, .func = 1, .input = 1 }, + { .port = 5, .pin = 3, .func = 1, .input = 1 }, + { .port = 5, .pin = 4, .func = 1, .input = 1 }, + { .port = 5, .pin = 5, .func = 1, .input = 1 }, + { .port = 5, .pin = 6, .func = 1, .input = 1 }, + { .port = 5, .pin = 7, .func = 1, .input = 1 }, + { .port = 7, .pin = 4, .func = 6, .input = 0 }, + { .port = 7, .pin = 11, .func = 2, .input = 0 }, + { .port = 8, .pin = 10, .func = 8, .input = 0 }, + { .port = 10, .pin = 15, .func = 2, .input = 0 }, +}; + +static const struct rza1_bidir_entry rza1h_bidir_entries[RZA1_NPORTS] = { + [1] = { ARRAY_SIZE(rza1h_bidir_pins_p1), rza1h_bidir_pins_p1 }, + [2] = { ARRAY_SIZE(rza1h_bidir_pins_p2), rza1h_bidir_pins_p2 }, + [3] = { ARRAY_SIZE(rza1h_bidir_pins_p3), rza1h_bidir_pins_p3 }, + [4] = { ARRAY_SIZE(rza1h_bidir_pins_p4), rza1h_bidir_pins_p4 }, + [6] = { ARRAY_SIZE(rza1h_bidir_pins_p6), rza1h_bidir_pins_p6 }, + [7] = { ARRAY_SIZE(rza1h_bidir_pins_p7), rza1h_bidir_pins_p7 }, + [8] = { ARRAY_SIZE(rza1h_bidir_pins_p8), rza1h_bidir_pins_p8 }, + [9] = { ARRAY_SIZE(rza1h_bidir_pins_p9), rza1h_bidir_pins_p9 }, + [11] = { ARRAY_SIZE(rza1h_bidir_pins_p11), rza1h_bidir_pins_p11 }, +}; + +static const struct rza1_swio_entry rza1h_swio_entries[] = { + [0] = { ARRAY_SIZE(rza1h_swio_pins), rza1h_swio_pins }, +}; + +/* RZ/A1H (r7s72100x) pinmux flags table */ +static const struct rza1_pinmux_conf rza1h_pmx_conf = { + .bidir_entries = rza1h_bidir_entries, + .swio_entries = rza1h_swio_entries, +}; + +/* ---------------------------------------------------------------------------- + * RZ/A1 types + */ +/** + * rza1_mux_conf - describes a pin multiplexing operation + * + * @id: the pin identifier from 0 to RZA1_NPINS + * @port: the port where pin sits on + * @pin: pin id + * @mux_func: alternate function id number + * @mux_flags: alternate function flags + * @value: output value to set the pin to + */ +struct rza1_mux_conf { + u16 id; + u8 port; + u8 pin; + u8 mux_func; + u8 mux_flags; + u8 value; +}; + +/** + * rza1_port - describes a pin port + * + * This is mostly useful to lock register writes per-bank and not globally. + * + * @lock: protect access to HW registers + * @id: port number + * @base: logical address base + * @pins: pins sitting on this port + */ +struct rza1_port { + spinlock_t lock; + unsigned int id; + void __iomem *base; + struct pinctrl_pin_desc *pins; +}; + +/** + * rza1_pinctrl - RZ pincontroller device + * + * @dev: parent device structure + * @mutex: protect [pinctrl|pinmux]_generic functions + * @base: logical address base + * @nports: number of pin controller ports + * @ports: pin controller banks + * @pins: pin array for pinctrl core + * @desc: pincontroller desc for pinctrl core + * @pctl: pinctrl device + * @data: device specific data + */ +struct rza1_pinctrl { + struct device *dev; + + struct mutex mutex; + + void __iomem *base; + + unsigned int nport; + struct rza1_port *ports; + + struct pinctrl_pin_desc *pins; + struct pinctrl_desc desc; + struct pinctrl_dev *pctl; + + const void *data; +}; + +/* ---------------------------------------------------------------------------- + * RZ/A1 pinmux flags + */ +static inline bool rza1_pinmux_get_bidir(unsigned int port, + unsigned int pin, + unsigned int func, + const struct rza1_bidir_entry *table) +{ + const struct rza1_bidir_entry *entry = &table[port]; + const struct rza1_bidir_pin *bidir_pin; + unsigned int i; + + for (i = 0; i < entry->npins; ++i) { + bidir_pin = &entry->pins[i]; + if (bidir_pin->pin == pin && bidir_pin->func == func) + return true; + } + + return false; +} + +static inline int rza1_pinmux_get_swio(unsigned int port, + unsigned int pin, + unsigned int func, + const struct rza1_swio_entry *table) +{ + const struct rza1_swio_pin *swio_pin; + unsigned int i; + + + for (i = 0; i < table->npins; ++i) { + swio_pin = &table->pins[i]; + if (swio_pin->port == port && swio_pin->pin == pin && + swio_pin->func == func) + return swio_pin->input; + } + + return -ENOENT; +} + +/** + * rza1_pinmux_get_flags() - return pinmux flags associated to a pin + */ +static unsigned int rza1_pinmux_get_flags(unsigned int port, unsigned int pin, + unsigned int func, + struct rza1_pinctrl *rza1_pctl) + +{ + const struct rza1_pinmux_conf *pmx_conf = rza1_pctl->data; + const struct rza1_bidir_entry *bidir_entries = pmx_conf->bidir_entries; + const struct rza1_swio_entry *swio_entries = pmx_conf->swio_entries; + unsigned int pmx_flags = 0; + int ret; + + if (rza1_pinmux_get_bidir(port, pin, func, bidir_entries)) + pmx_flags |= MUX_FLAGS_BIDIR; + + ret = rza1_pinmux_get_swio(port, pin, func, swio_entries); + if (ret == 0) + pmx_flags |= MUX_FLAGS_SWIO_OUTPUT; + else if (ret > 0) + pmx_flags |= MUX_FLAGS_SWIO_INPUT; + + return pmx_flags; +} + +/* ---------------------------------------------------------------------------- + * RZ/A1 SoC operations + */ + +/** + * rza1_set_bit() - un-locked set/clear a single bit in pin configuration + * registers + */ +static inline void rza1_set_bit(struct rza1_port *port, unsigned int reg, + unsigned int bit, bool set) +{ + void __iomem *mem = RZA1_ADDR(port->base, reg, port->id); + u16 val = ioread16(mem); + + if (set) + val |= BIT(bit); + else + val &= ~BIT(bit); + + iowrite16(val, mem); +} + +static inline unsigned int rza1_get_bit(struct rza1_port *port, + unsigned int reg, unsigned int bit) +{ + void __iomem *mem = RZA1_ADDR(port->base, reg, port->id); + + return ioread16(mem) & BIT(bit); +} + +/** + * rza1_pin_reset() - reset a pin to default initial state + * + * Reset pin state disabling input buffer and bi-directional control, + * and configure it as input port. + * Note that pin is now configured with direction as input but with input + * buffer disabled. This implies the pin value cannot be read in this state. + * + * @port: port where pin sits on + * @pin: pin offset + */ +static void rza1_pin_reset(struct rza1_port *port, unsigned int pin) +{ + unsigned long irqflags; + + spin_lock_irqsave(&port->lock, irqflags); + rza1_set_bit(port, RZA1_PIBC_REG, pin, 0); + rza1_set_bit(port, RZA1_PBDC_REG, pin, 0); + + rza1_set_bit(port, RZA1_PM_REG, pin, 1); + rza1_set_bit(port, RZA1_PMC_REG, pin, 0); + rza1_set_bit(port, RZA1_PIPC_REG, pin, 0); + spin_unlock_irqrestore(&port->lock, irqflags); +} + +static inline int rza1_pin_get_direction(struct rza1_port *port, + unsigned int pin) +{ + unsigned long irqflags; + int input; + + spin_lock_irqsave(&port->lock, irqflags); + input = rza1_get_bit(port, RZA1_PM_REG, pin); + spin_unlock_irqrestore(&port->lock, irqflags); + + return !!input; +} + +/** + * rza1_pin_set_direction() - set I/O direction on a pin in port mode + * + * When running in output port mode keep PBDC enabled to allow reading the + * pin value from PPR. + * + * @port: port where pin sits on + * @pin: pin offset + * @input: input enable/disable flag + */ +static inline void rza1_pin_set_direction(struct rza1_port *port, + unsigned int pin, bool input) +{ + unsigned long irqflags; + + spin_lock_irqsave(&port->lock, irqflags); + + rza1_set_bit(port, RZA1_PIBC_REG, pin, 1); + if (input) { + rza1_set_bit(port, RZA1_PM_REG, pin, 1); + rza1_set_bit(port, RZA1_PBDC_REG, pin, 0); + } else { + rza1_set_bit(port, RZA1_PM_REG, pin, 0); + rza1_set_bit(port, RZA1_PBDC_REG, pin, 1); + } + + spin_unlock_irqrestore(&port->lock, irqflags); +} + +static inline void rza1_pin_set(struct rza1_port *port, unsigned int pin, + unsigned int value) +{ + unsigned long irqflags; + + spin_lock_irqsave(&port->lock, irqflags); + rza1_set_bit(port, RZA1_P_REG, pin, !!value); + spin_unlock_irqrestore(&port->lock, irqflags); +} + +static inline int rza1_pin_get(struct rza1_port *port, unsigned int pin) +{ + unsigned long irqflags; + int val; + + spin_lock_irqsave(&port->lock, irqflags); + val = rza1_get_bit(port, RZA1_PPR_REG, pin); + spin_unlock_irqrestore(&port->lock, irqflags); + + return val; +} + +/** + * rza1_pin_mux_single() - configure pin multiplexing on a single pin + * + * @pinctrl: RZ/A1 pin controller device + * @mux_conf: pin multiplexing descriptor + */ +static int rza1_pin_mux_single(struct rza1_pinctrl *rza1_pctl, + struct rza1_mux_conf *mux_conf) +{ + struct rza1_port *port = &rza1_pctl->ports[mux_conf->port]; + unsigned int pin = mux_conf->pin; + u8 mux_func = mux_conf->mux_func; + u8 mux_flags = mux_conf->mux_flags; + u8 mux_flags_from_table; + + rza1_pin_reset(port, pin); + + /* SWIO pinmux flags coming from DT are high precedence */ + mux_flags_from_table = rza1_pinmux_get_flags(port->id, pin, mux_func, + rza1_pctl); + if (mux_flags) + mux_flags |= (mux_flags_from_table & MUX_FLAGS_BIDIR); + else + mux_flags = mux_flags_from_table; + + if (mux_flags & MUX_FLAGS_BIDIR) + rza1_set_bit(port, RZA1_PBDC_REG, pin, 1); + + /* + * Enable alternate function mode and select it. + * + * Be careful here: the pin mux sub-nodes in device tree + * enumerate alternate functions from 1 to 8; + * subtract 1 before using macros to match registers configuration + * which expects numbers from 0 to 7 instead. + * + * ---------------------------------------------------- + * Alternate mode selection table: + * + * PMC PFC PFCE PFCAE (mux_func - 1) + * 1 0 0 0 0 + * 1 1 0 0 1 + * 1 0 1 0 2 + * 1 1 1 0 3 + * 1 0 0 1 4 + * 1 1 0 1 5 + * 1 0 1 1 6 + * 1 1 1 1 7 + * ---------------------------------------------------- + */ + mux_func -= 1; + rza1_set_bit(port, RZA1_PFC_REG, pin, mux_func & MUX_FUNC_PFC_MASK); + rza1_set_bit(port, RZA1_PFCE_REG, pin, mux_func & MUX_FUNC_PFCE_MASK); + rza1_set_bit(port, RZA1_PFCEA_REG, pin, mux_func & MUX_FUNC_PFCEA_MASK); + + /* + * All alternate functions except a few need PIPCn = 1. + * If PIPCn has to stay disabled (SW IO mode), configure PMn according + * to I/O direction specified by pin configuration -after- PMC has been + * set to one. + */ + if (mux_flags & (MUX_FLAGS_SWIO_INPUT | MUX_FLAGS_SWIO_OUTPUT)) + rza1_set_bit(port, RZA1_PM_REG, pin, + mux_flags & MUX_FLAGS_SWIO_INPUT); + else + rza1_set_bit(port, RZA1_PIPC_REG, pin, 1); + + rza1_set_bit(port, RZA1_PMC_REG, pin, 1); + + return 0; +} + +/* ---------------------------------------------------------------------------- + * gpio operations + */ + +/** + * rza1_gpio_request() - configure pin in port mode + * + * Configure a pin as gpio (port mode). + * After reset, the pin is in input mode with input buffer disabled. + * To use the pin as input or output, set_direction shall be called first + * + * @chip: gpio chip where the gpio sits on + * @gpio: gpio offset + */ +static int rza1_gpio_request(struct gpio_chip *chip, unsigned int gpio) +{ + struct rza1_port *port = gpiochip_get_data(chip); + + rza1_pin_reset(port, gpio); + + return 0; +} + +/** + * rza1_gpio_disable_free() - reset a pin + * + * Surprisingly, disable_free a gpio, is equivalent to request it. + * Reset pin to port mode, with input buffer disabled. This overwrites all + * port direction settings applied with set_direction + * + * @chip: gpio chip where the gpio sits on + * @gpio: gpio offset + */ +static void rza1_gpio_free(struct gpio_chip *chip, unsigned int gpio) +{ + struct rza1_port *port = gpiochip_get_data(chip); + + rza1_pin_reset(port, gpio); +} + +static int rza1_gpio_get_direction(struct gpio_chip *chip, unsigned int gpio) +{ + struct rza1_port *port = gpiochip_get_data(chip); + + return rza1_pin_get_direction(port, gpio); +} + +static int rza1_gpio_direction_input(struct gpio_chip *chip, + unsigned int gpio) +{ + struct rza1_port *port = gpiochip_get_data(chip); + + rza1_pin_set_direction(port, gpio, true); + + return 0; +} + +static int rza1_gpio_direction_output(struct gpio_chip *chip, + unsigned int gpio, + int value) +{ + struct rza1_port *port = gpiochip_get_data(chip); + + /* Set value before driving pin direction */ + rza1_pin_set(port, gpio, value); + rza1_pin_set_direction(port, gpio, false); + + return 0; +} + +/** + * rza1_gpio_get() - read a gpio pin value + * + * Read gpio pin value through PPR register. + * Requires bi-directional mode to work when reading the value of a pin + * in output mode + * + * @chip: gpio chip where the gpio sits on + * @gpio: gpio offset + */ +static int rza1_gpio_get(struct gpio_chip *chip, unsigned int gpio) +{ + struct rza1_port *port = gpiochip_get_data(chip); + + return rza1_pin_get(port, gpio); +} + +static void rza1_gpio_set(struct gpio_chip *chip, unsigned int gpio, + int value) +{ + struct rza1_port *port = gpiochip_get_data(chip); + + rza1_pin_set(port, gpio, value); +} + +struct gpio_chip rza1_gpiochip_template = { + .request = rza1_gpio_request, + .free = rza1_gpio_free, + .get_direction = rza1_gpio_get_direction, + .direction_input = rza1_gpio_direction_input, + .direction_output = rza1_gpio_direction_output, + .get = rza1_gpio_get, + .set = rza1_gpio_set, +}; +/* ---------------------------------------------------------------------------- + * pinctrl operations + */ + +/** + * rza1_dt_node_pin_count() - Count number of pins in a dt node or in all its + * children sub-nodes + * + * @np: device tree node to parse + */ +static int rza1_dt_node_pin_count(struct device_node *np) +{ + struct device_node *child; + struct property *of_pins; + unsigned int npins; + + of_pins = of_find_property(np, "pinmux", NULL); + if (of_pins) + return of_pins->length / sizeof(u32); + + npins = 0; + for_each_child_of_node(np, child) { + of_pins = of_find_property(child, "pinmux", NULL); + if (!of_pins) + return -EINVAL; + + npins += of_pins->length / sizeof(u32); + } + + return npins; +} + +/** + * rza1_parse_pmx_function() - parse a pin mux sub-node + * + * @rza1_pctl: RZ/A1 pin controller device + * @np: of pmx sub-node + * @mux_confs: array of pin mux configurations to fill with parsed info + * @grpins: array of pin ids to mux + */ +static int rza1_parse_pinmux_node(struct rza1_pinctrl *rza1_pctl, + struct device_node *np, + struct rza1_mux_conf *mux_confs, + unsigned int *grpins) +{ + struct pinctrl_dev *pctldev = rza1_pctl->pctl; + char const *prop_name = "pinmux"; + unsigned long *pin_configs; + unsigned int npin_configs; + struct property *of_pins; + unsigned int npins; + u8 pinmux_flags; + unsigned int i; + int ret; + + of_pins = of_find_property(np, prop_name, NULL); + if (!of_pins) { + dev_dbg(rza1_pctl->dev, "Missing %s property\n", prop_name); + return -ENOENT; + } + npins = of_pins->length / sizeof(u32); + + /* + * Collect pin configuration properties: they apply to all pins in + * this sub-node + */ + ret = pinconf_generic_parse_dt_config(np, pctldev, &pin_configs, + &npin_configs); + if (ret) { + dev_err(rza1_pctl->dev, + "Unable to parse pin configuration options for %s\n", + np->name); + return ret; + } + + /* + * Create a mask with pinmux flags from pin configuration; + * very few pins (TIOC[0-4][A|B|C|D] require SWIO direction + * specified in device tree. + */ + pinmux_flags = 0; + for (i = 0; i < npin_configs && pinmux_flags == 0; i++) + switch (pinconf_to_config_param(pin_configs[i])) { + case PIN_CONFIG_INPUT_ENABLE: + pinmux_flags |= MUX_FLAGS_SWIO_INPUT; + break; + case PIN_CONFIG_OUTPUT: + pinmux_flags |= MUX_FLAGS_SWIO_OUTPUT; + default: + break; + + } + + kfree(pin_configs); + + /* Collect pin positions and their mux settings. */ + for (i = 0; i < npins; ++i) { + u32 of_pinconf; + struct rza1_mux_conf *mux_conf = &mux_confs[i]; + + ret = of_property_read_u32_index(np, prop_name, i, &of_pinconf); + if (ret) + return ret; + + mux_conf->id = of_pinconf & MUX_PIN_ID_MASK; + mux_conf->port = RZA1_PIN_ID_TO_PORT(mux_conf->id); + mux_conf->pin = RZA1_PIN_ID_TO_PIN(mux_conf->id); + mux_conf->mux_func = MUX_FUNC(of_pinconf); + mux_conf->mux_flags = pinmux_flags; + + if (mux_conf->port >= RZA1_NPORTS || + mux_conf->pin >= RZA1_PINS_PER_PORT) { + dev_err(rza1_pctl->dev, + "Wrong port %u pin %u for %s property\n", + mux_conf->port, mux_conf->pin, prop_name); + return -EINVAL; + } + + grpins[i] = mux_conf->id; + } + + return npins; +} + +/** + * rza1_dt_node_to_map() - map a pin mux node to a function/group + * + * Parse and register a pin mux function. + * + * @pctldev: pin controller device + * @np: device tree node to parse + * @map: pointer to pin map (output) + * @num_maps: number of collected maps (output) + */ +static int rza1_dt_node_to_map(struct pinctrl_dev *pctldev, + struct device_node *np, + struct pinctrl_map **map, + unsigned int *num_maps) +{ + struct rza1_pinctrl *rza1_pctl = pinctrl_dev_get_drvdata(pctldev); + struct rza1_mux_conf *mux_confs, *mux_conf; + unsigned int *grpins, *grpin; + struct device_node *child; + const char *grpname; + const char **fngrps; + int ret, npins; + + npins = rza1_dt_node_pin_count(np); + if (npins < 0) { + dev_err(rza1_pctl->dev, "invalid pinmux node structure\n"); + return -EINVAL; + } + + /* + * Functions are made of 1 group only; + * in fact, functions and groups are identical for this pin controller + * except that functions carry an array of per-pin mux configuration + * settings. + */ + mux_confs = devm_kcalloc(rza1_pctl->dev, npins, sizeof(*mux_confs), + GFP_KERNEL); + grpins = devm_kcalloc(rza1_pctl->dev, npins, sizeof(*grpins), + GFP_KERNEL); + fngrps = devm_kzalloc(rza1_pctl->dev, sizeof(*fngrps), GFP_KERNEL); + + if (!mux_confs || !grpins || !fngrps) + return -ENOMEM; + + /* + * Parse the pinmux node. + * If the node does not contain "pinmux" property (-ENOENT) + * that property shall be specified in all its children sub-nodes. + */ + mux_conf = &mux_confs[0]; + grpin = &grpins[0]; + + ret = rza1_parse_pinmux_node(rza1_pctl, np, mux_conf, grpin); + if (ret == -ENOENT) + for_each_child_of_node(np, child) { + ret = rza1_parse_pinmux_node(rza1_pctl, child, mux_conf, + grpin); + if (ret < 0) + return ret; + + grpin += ret; + mux_conf += ret; + } + else if (ret < 0) + return ret; + + /* Register pin group and function name to pinctrl_generic */ + grpname = np->name; + fngrps[0] = grpname; + + mutex_lock(&rza1_pctl->mutex); + ret = pinctrl_generic_add_group(pctldev, grpname, grpins, npins, + NULL); + if (ret) { + mutex_unlock(&rza1_pctl->mutex); + return ret; + } + + ret = pinmux_generic_add_function(pctldev, grpname, fngrps, 1, + mux_confs); + if (ret) + goto remove_group; + mutex_unlock(&rza1_pctl->mutex); + + dev_info(rza1_pctl->dev, "Parsed function and group %s with %d pins\n", + grpname, npins); + + /* Create map where to retrieve function and mux settings from */ + *num_maps = 0; + *map = kzalloc(sizeof(**map), GFP_KERNEL); + if (!*map) { + ret = -ENOMEM; + goto remove_function; + } + + (*map)->type = PIN_MAP_TYPE_MUX_GROUP; + (*map)->data.mux.group = np->name; + (*map)->data.mux.function = np->name; + *num_maps = 1; + + return 0; + +remove_function: + mutex_lock(&rza1_pctl->mutex); + pinmux_generic_remove_last_function(pctldev); + +remove_group: + pinctrl_generic_remove_last_group(pctldev); + mutex_unlock(&rza1_pctl->mutex); + + dev_info(rza1_pctl->dev, "Unable to parse function and group %s\n", + grpname); + + return ret; +} + +static void rza1_dt_free_map(struct pinctrl_dev *pctldev, + struct pinctrl_map *map, unsigned int num_maps) +{ + kfree(map); +} + +static const struct pinctrl_ops rza1_pinctrl_ops = { + .get_groups_count = pinctrl_generic_get_group_count, + .get_group_name = pinctrl_generic_get_group_name, + .get_group_pins = pinctrl_generic_get_group_pins, + .dt_node_to_map = rza1_dt_node_to_map, + .dt_free_map = rza1_dt_free_map, +}; + +/* ---------------------------------------------------------------------------- + * pinmux operations + */ + +/** + * rza1_set_mux() - retrieve pins from a group and apply their mux settings + * + * @pctldev: pin controller device + * @selector: function selector + * @group: group selector + */ +static int rza1_set_mux(struct pinctrl_dev *pctldev, unsigned int selector, + unsigned int group) +{ + struct rza1_pinctrl *rza1_pctl = pinctrl_dev_get_drvdata(pctldev); + struct rza1_mux_conf *mux_confs; + struct function_desc *func; + struct group_desc *grp; + int i; + + grp = pinctrl_generic_get_group(pctldev, group); + if (!grp) + return -EINVAL; + + func = pinmux_generic_get_function(pctldev, selector); + if (!func) + return -EINVAL; + + mux_confs = (struct rza1_mux_conf *)func->data; + for (i = 0; i < grp->num_pins; ++i) { + int ret; + + ret = rza1_pin_mux_single(rza1_pctl, &mux_confs[i]); + if (ret) + return ret; + } + + return 0; +} + +struct pinmux_ops rza1_pinmux_ops = { + .get_functions_count = pinmux_generic_get_function_count, + .get_function_name = pinmux_generic_get_function_name, + .get_function_groups = pinmux_generic_get_function_groups, + .set_mux = rza1_set_mux, + .strict = true, +}; + +/* ---------------------------------------------------------------------------- + * RZ/A1 pin controller driver operations + */ + +static unsigned int rza1_count_gpio_chips(struct device_node *np) +{ + struct device_node *child; + unsigned int count = 0; + + for_each_child_of_node(np, child) { + if (!of_property_read_bool(child, "gpio-controller")) + continue; + + count++; + } + + return count; +} + +/** + * rza1_parse_gpiochip() - parse and register a gpio chip and pin range + * + * The gpio controller subnode shall provide a "gpio-ranges" list property as + * defined by gpio device tree binding documentation. + * + * @rza1_pctl: RZ/A1 pin controller device + * @np: of gpio-controller node + * @chip: gpio chip to register to gpiolib + * @range: pin range to register to pinctrl core + */ +static int rza1_parse_gpiochip(struct rza1_pinctrl *rza1_pctl, + struct device_node *np, + struct gpio_chip *chip, + struct pinctrl_gpio_range *range) +{ + const char *list_name = "gpio-ranges"; + struct of_phandle_args of_args; + unsigned int gpioport; + u32 pinctrl_base; + int ret; + + ret = of_parse_phandle_with_fixed_args(np, list_name, 3, 0, &of_args); + if (ret) { + dev_err(rza1_pctl->dev, "Unable to parse %s list property\n", + list_name); + return ret; + } + + /* + * Find out on which port this gpio-chip maps to by inspecting the + * second argument of the "gpio-ranges" property. + */ + pinctrl_base = of_args.args[1]; + gpioport = RZA1_PIN_ID_TO_PORT(pinctrl_base); + if (gpioport > RZA1_NPORTS) { + dev_err(rza1_pctl->dev, + "Invalid values in property %s\n", list_name); + return -EINVAL; + } + + *chip = rza1_gpiochip_template; + chip->base = -1; + chip->label = devm_kasprintf(rza1_pctl->dev, GFP_KERNEL, "%s-%u", + np->name, gpioport); + chip->ngpio = of_args.args[2]; + chip->of_node = np; + chip->parent = rza1_pctl->dev; + + range->id = gpioport; + range->name = chip->label; + range->pin_base = range->base = pinctrl_base; + range->npins = of_args.args[2]; + range->gc = chip; + + ret = devm_gpiochip_add_data(rza1_pctl->dev, chip, + &rza1_pctl->ports[gpioport]); + if (ret) + return ret; + + pinctrl_add_gpio_range(rza1_pctl->pctl, range); + + dev_info(rza1_pctl->dev, "Parsed gpiochip %s with %d pins\n", + chip->label, chip->ngpio); + + return 0; +} + +/** + * rza1_gpio_register() - parse DT to collect gpio-chips and gpio-ranges + * + * @rza1_pctl: RZ/A1 pin controller device + */ +static int rza1_gpio_register(struct rza1_pinctrl *rza1_pctl) +{ + struct device_node *np = rza1_pctl->dev->of_node; + struct pinctrl_gpio_range *gpio_ranges; + struct gpio_chip *gpio_chips; + struct device_node *child; + unsigned int ngpiochips; + unsigned int i; + int ret; + + ngpiochips = rza1_count_gpio_chips(np); + if (ngpiochips == 0) { + dev_dbg(rza1_pctl->dev, "No gpiochip registered\n"); + return 0; + } + + gpio_chips = devm_kcalloc(rza1_pctl->dev, ngpiochips, + sizeof(*gpio_chips), GFP_KERNEL); + gpio_ranges = devm_kcalloc(rza1_pctl->dev, ngpiochips, + sizeof(*gpio_ranges), GFP_KERNEL); + if (!gpio_chips || !gpio_ranges) + return -ENOMEM; + + i = 0; + for_each_child_of_node(np, child) { + if (!of_property_read_bool(child, "gpio-controller")) + continue; + + ret = rza1_parse_gpiochip(rza1_pctl, child, &gpio_chips[i], + &gpio_ranges[i]); + if (ret) + goto gpiochip_remove; + + ++i; + } + + dev_info(rza1_pctl->dev, "Registered %u gpio controllers\n", i); + + return 0; + +gpiochip_remove: + for (; i > 0; i--) + devm_gpiochip_remove(rza1_pctl->dev, &gpio_chips[i - 1]); + + return ret; +} + +/** + * rza1_pinctrl_register() - Enumerate pins, ports and gpiochips; register + * them to pinctrl and gpio cores. + * + * @rza1_pctl: RZ/A1 pin controller device + */ +static int rza1_pinctrl_register(struct rza1_pinctrl *rza1_pctl) +{ + struct pinctrl_pin_desc *pins; + struct rza1_port *ports; + unsigned int i; + int ret; + + pins = devm_kcalloc(rza1_pctl->dev, RZA1_NPINS, sizeof(*pins), + GFP_KERNEL); + ports = devm_kcalloc(rza1_pctl->dev, RZA1_NPORTS, sizeof(*ports), + GFP_KERNEL); + if (!pins || !ports) + return -ENOMEM; + + rza1_pctl->pins = pins; + rza1_pctl->desc.pins = pins; + rza1_pctl->desc.npins = RZA1_NPINS; + rza1_pctl->ports = ports; + + for (i = 0; i < RZA1_NPINS; ++i) { + unsigned int pin = RZA1_PIN_ID_TO_PIN(i); + unsigned int port = RZA1_PIN_ID_TO_PORT(i); + + pins[i].number = i; + pins[i].name = devm_kasprintf(rza1_pctl->dev, GFP_KERNEL, + "P%u-%u", port, pin); + + if (i % RZA1_PINS_PER_PORT == 0) { + /* + * Setup ports; + * they provide per-port lock and logical base address. + */ + unsigned int port_id = RZA1_PIN_ID_TO_PORT(i); + + ports[port_id].id = port_id; + ports[port_id].base = rza1_pctl->base; + ports[port_id].pins = &pins[i]; + spin_lock_init(&ports[port_id].lock); + } + } + + ret = devm_pinctrl_register_and_init(rza1_pctl->dev, &rza1_pctl->desc, + rza1_pctl, &rza1_pctl->pctl); + if (ret) { + dev_err(rza1_pctl->dev, + "RZ/A1 pin controller registration failed\n"); + return ret; + } + + ret = pinctrl_enable(rza1_pctl->pctl); + if (ret) { + dev_err(rza1_pctl->dev, + "RZ/A1 pin controller failed to start\n"); + return ret; + } + + ret = rza1_gpio_register(rza1_pctl); + if (ret) { + dev_err(rza1_pctl->dev, "RZ/A1 GPIO registration failed\n"); + return ret; + } + + return 0; +} + +static int rza1_pinctrl_probe(struct platform_device *pdev) +{ + struct rza1_pinctrl *rza1_pctl; + struct resource *res; + int ret; + + rza1_pctl = devm_kzalloc(&pdev->dev, sizeof(*rza1_pctl), GFP_KERNEL); + if (!rza1_pctl) + return -ENOMEM; + + rza1_pctl->dev = &pdev->dev; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (ret) + return -ENODEV; + + rza1_pctl->base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(rza1_pctl->base)) + return PTR_ERR(rza1_pctl->base); + + mutex_init(&rza1_pctl->mutex); + + platform_set_drvdata(pdev, rza1_pctl); + + rza1_pctl->desc.name = DRIVER_NAME; + rza1_pctl->desc.pctlops = &rza1_pinctrl_ops; + rza1_pctl->desc.pmxops = &rza1_pinmux_ops; + rza1_pctl->desc.owner = THIS_MODULE; + rza1_pctl->data = of_device_get_match_data(&pdev->dev); + + ret = rza1_pinctrl_register(rza1_pctl); + if (ret) + return ret; + + dev_info(&pdev->dev, + "RZ/A1 pin controller and gpio successfully registered\n"); + + return 0; +} + +static const struct of_device_id rza1_pinctrl_of_match[] = { + { + .compatible = "renesas,r7s72100-ports", + .data = &rza1h_pmx_conf, + }, + { } +}; + +static struct platform_driver rza1_pinctrl_driver = { + .driver = { + .name = DRIVER_NAME, + .of_match_table = rza1_pinctrl_of_match, + }, + .probe = rza1_pinctrl_probe, +}; + +static int __init rza1_pinctrl_init(void) +{ + return platform_driver_register(&rza1_pinctrl_driver); +} +core_initcall(rza1_pinctrl_init); + +MODULE_AUTHOR("Jacopo Mondi <jacopo+renesas@jmondi.org"); +MODULE_DESCRIPTION("Pin and gpio controller driver for Reneas RZ/A1 SoC"); +MODULE_LICENSE("GPL v2"); |