diff options
Diffstat (limited to 'drivers/pinctrl/renesas/pinctrl-rzn1.c')
| -rw-r--r-- | drivers/pinctrl/renesas/pinctrl-rzn1.c | 951 |
1 files changed, 951 insertions, 0 deletions
diff --git a/drivers/pinctrl/renesas/pinctrl-rzn1.c b/drivers/pinctrl/renesas/pinctrl-rzn1.c new file mode 100644 index 000000000..849d09120 --- /dev/null +++ b/drivers/pinctrl/renesas/pinctrl-rzn1.c @@ -0,0 +1,951 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2014-2018 Renesas Electronics Europe Limited + * + * Phil Edworthy <phil.edworthy@renesas.com> + * Based on a driver originally written by Michel Pollet at Renesas. + */ + +#include <dt-bindings/pinctrl/rzn1-pinctrl.h> +#include <linux/clk.h> +#include <linux/device.h> +#include <linux/io.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/pinctrl/pinconf-generic.h> +#include <linux/pinctrl/pinctrl.h> +#include <linux/pinctrl/pinmux.h> +#include <linux/platform_device.h> +#include <linux/slab.h> +#include "../core.h" +#include "../pinconf.h" +#include "../pinctrl-utils.h" + +/* Field positions and masks in the pinmux registers */ +#define RZN1_L1_PIN_DRIVE_STRENGTH 10 +#define RZN1_L1_PIN_DRIVE_STRENGTH_4MA 0 +#define RZN1_L1_PIN_DRIVE_STRENGTH_6MA 1 +#define RZN1_L1_PIN_DRIVE_STRENGTH_8MA 2 +#define RZN1_L1_PIN_DRIVE_STRENGTH_12MA 3 +#define RZN1_L1_PIN_PULL 8 +#define RZN1_L1_PIN_PULL_NONE 0 +#define RZN1_L1_PIN_PULL_UP 1 +#define RZN1_L1_PIN_PULL_DOWN 3 +#define RZN1_L1_FUNCTION 0 +#define RZN1_L1_FUNC_MASK 0xf +#define RZN1_L1_FUNCTION_L2 0xf + +/* + * The hardware manual describes two levels of multiplexing, but it's more + * logical to think of the hardware as three levels, with level 3 consisting of + * the multiplexing for Ethernet MDIO signals. + * + * Level 1 functions go from 0 to 9, with level 1 function '15' (0xf) specifying + * that level 2 functions are used instead. Level 2 has a lot more options, + * going from 0 to 61. Level 3 allows selection of MDIO functions which can be + * floating, or one of seven internal peripherals. Unfortunately, there are two + * level 2 functions that can select MDIO, and two MDIO channels so we have four + * sets of level 3 functions. + * + * For this driver, we've compounded the numbers together, so: + * 0 to 9 is level 1 + * 10 to 71 is 10 + level 2 number + * 72 to 79 is 72 + MDIO0 source for level 2 MDIO function. + * 80 to 87 is 80 + MDIO0 source for level 2 MDIO_E1 function. + * 88 to 95 is 88 + MDIO1 source for level 2 MDIO function. + * 96 to 103 is 96 + MDIO1 source for level 2 MDIO_E1 function. + * Examples: + * Function 28 corresponds UART0 + * Function 73 corresponds to MDIO0 to GMAC0 + * + * There are 170 configurable pins (called PL_GPIO in the datasheet). + */ + +/* + * Structure detailing the HW registers on the RZ/N1 devices. + * Both the Level 1 mux registers and Level 2 mux registers have the same + * structure. The only difference is that Level 2 has additional MDIO registers + * at the end. + */ +struct rzn1_pinctrl_regs { + u32 conf[170]; + u32 pad0[86]; + u32 status_protect; /* 0x400 */ + /* MDIO mux registers, level2 only */ + u32 l2_mdio[2]; +}; + +/** + * struct rzn1_pmx_func - describes rzn1 pinmux functions + * @name: the name of this specific function + * @groups: corresponding pin groups + * @num_groups: the number of groups + */ +struct rzn1_pmx_func { + const char *name; + const char **groups; + unsigned int num_groups; +}; + +/** + * struct rzn1_pin_group - describes an rzn1 pin group + * @name: the name of this specific pin group + * @func: the name of the function selected by this group + * @npins: the number of pins in this group array, i.e. the number of + * elements in .pins so we can iterate over that array + * @pins: array of pins. Needed due to pinctrl_ops.get_group_pins() + * @pin_ids: array of pin_ids, i.e. the value used to select the mux + */ +struct rzn1_pin_group { + const char *name; + const char *func; + unsigned int npins; + unsigned int *pins; + u8 *pin_ids; +}; + +struct rzn1_pinctrl { + struct device *dev; + struct clk *clk; + struct pinctrl_dev *pctl; + struct rzn1_pinctrl_regs __iomem *lev1; + struct rzn1_pinctrl_regs __iomem *lev2; + u32 lev1_protect_phys; + u32 lev2_protect_phys; + int mdio_func[2]; + + struct rzn1_pin_group *groups; + unsigned int ngroups; + + struct rzn1_pmx_func *functions; + unsigned int nfunctions; +}; + +#define RZN1_PINS_PROP "pinmux" + +#define RZN1_PIN(pin) PINCTRL_PIN(pin, "pl_gpio"#pin) + +static const struct pinctrl_pin_desc rzn1_pins[] = { + RZN1_PIN(0), RZN1_PIN(1), RZN1_PIN(2), RZN1_PIN(3), RZN1_PIN(4), + RZN1_PIN(5), RZN1_PIN(6), RZN1_PIN(7), RZN1_PIN(8), RZN1_PIN(9), + RZN1_PIN(10), RZN1_PIN(11), RZN1_PIN(12), RZN1_PIN(13), RZN1_PIN(14), + RZN1_PIN(15), RZN1_PIN(16), RZN1_PIN(17), RZN1_PIN(18), RZN1_PIN(19), + RZN1_PIN(20), RZN1_PIN(21), RZN1_PIN(22), RZN1_PIN(23), RZN1_PIN(24), + RZN1_PIN(25), RZN1_PIN(26), RZN1_PIN(27), RZN1_PIN(28), RZN1_PIN(29), + RZN1_PIN(30), RZN1_PIN(31), RZN1_PIN(32), RZN1_PIN(33), RZN1_PIN(34), + RZN1_PIN(35), RZN1_PIN(36), RZN1_PIN(37), RZN1_PIN(38), RZN1_PIN(39), + RZN1_PIN(40), RZN1_PIN(41), RZN1_PIN(42), RZN1_PIN(43), RZN1_PIN(44), + RZN1_PIN(45), RZN1_PIN(46), RZN1_PIN(47), RZN1_PIN(48), RZN1_PIN(49), + RZN1_PIN(50), RZN1_PIN(51), RZN1_PIN(52), RZN1_PIN(53), RZN1_PIN(54), + RZN1_PIN(55), RZN1_PIN(56), RZN1_PIN(57), RZN1_PIN(58), RZN1_PIN(59), + RZN1_PIN(60), RZN1_PIN(61), RZN1_PIN(62), RZN1_PIN(63), RZN1_PIN(64), + RZN1_PIN(65), RZN1_PIN(66), RZN1_PIN(67), RZN1_PIN(68), RZN1_PIN(69), + RZN1_PIN(70), RZN1_PIN(71), RZN1_PIN(72), RZN1_PIN(73), RZN1_PIN(74), + RZN1_PIN(75), RZN1_PIN(76), RZN1_PIN(77), RZN1_PIN(78), RZN1_PIN(79), + RZN1_PIN(80), RZN1_PIN(81), RZN1_PIN(82), RZN1_PIN(83), RZN1_PIN(84), + RZN1_PIN(85), RZN1_PIN(86), RZN1_PIN(87), RZN1_PIN(88), RZN1_PIN(89), + RZN1_PIN(90), RZN1_PIN(91), RZN1_PIN(92), RZN1_PIN(93), RZN1_PIN(94), + RZN1_PIN(95), RZN1_PIN(96), RZN1_PIN(97), RZN1_PIN(98), RZN1_PIN(99), + RZN1_PIN(100), RZN1_PIN(101), RZN1_PIN(102), RZN1_PIN(103), + RZN1_PIN(104), RZN1_PIN(105), RZN1_PIN(106), RZN1_PIN(107), + RZN1_PIN(108), RZN1_PIN(109), RZN1_PIN(110), RZN1_PIN(111), + RZN1_PIN(112), RZN1_PIN(113), RZN1_PIN(114), RZN1_PIN(115), + RZN1_PIN(116), RZN1_PIN(117), RZN1_PIN(118), RZN1_PIN(119), + RZN1_PIN(120), RZN1_PIN(121), RZN1_PIN(122), RZN1_PIN(123), + RZN1_PIN(124), RZN1_PIN(125), RZN1_PIN(126), RZN1_PIN(127), + RZN1_PIN(128), RZN1_PIN(129), RZN1_PIN(130), RZN1_PIN(131), + RZN1_PIN(132), RZN1_PIN(133), RZN1_PIN(134), RZN1_PIN(135), + RZN1_PIN(136), RZN1_PIN(137), RZN1_PIN(138), RZN1_PIN(139), + RZN1_PIN(140), RZN1_PIN(141), RZN1_PIN(142), RZN1_PIN(143), + RZN1_PIN(144), RZN1_PIN(145), RZN1_PIN(146), RZN1_PIN(147), + RZN1_PIN(148), RZN1_PIN(149), RZN1_PIN(150), RZN1_PIN(151), + RZN1_PIN(152), RZN1_PIN(153), RZN1_PIN(154), RZN1_PIN(155), + RZN1_PIN(156), RZN1_PIN(157), RZN1_PIN(158), RZN1_PIN(159), + RZN1_PIN(160), RZN1_PIN(161), RZN1_PIN(162), RZN1_PIN(163), + RZN1_PIN(164), RZN1_PIN(165), RZN1_PIN(166), RZN1_PIN(167), + RZN1_PIN(168), RZN1_PIN(169), +}; + +enum { + LOCK_LEVEL1 = 0x1, + LOCK_LEVEL2 = 0x2, + LOCK_ALL = LOCK_LEVEL1 | LOCK_LEVEL2, +}; + +static void rzn1_hw_set_lock(struct rzn1_pinctrl *ipctl, u8 lock, u8 value) +{ + /* + * The pinmux configuration is locked by writing the physical address of + * the status_protect register to itself. It is unlocked by writing the + * address | 1. + */ + if (lock & LOCK_LEVEL1) { + u32 val = ipctl->lev1_protect_phys | !(value & LOCK_LEVEL1); + + writel(val, &ipctl->lev1->status_protect); + } + + if (lock & LOCK_LEVEL2) { + u32 val = ipctl->lev2_protect_phys | !(value & LOCK_LEVEL2); + + writel(val, &ipctl->lev2->status_protect); + } +} + +static void rzn1_pinctrl_mdio_select(struct rzn1_pinctrl *ipctl, int mdio, + u32 func) +{ + if (ipctl->mdio_func[mdio] >= 0 && ipctl->mdio_func[mdio] != func) + dev_warn(ipctl->dev, "conflicting setting for mdio%d!\n", mdio); + ipctl->mdio_func[mdio] = func; + + dev_dbg(ipctl->dev, "setting mdio%d to %u\n", mdio, func); + + writel(func, &ipctl->lev2->l2_mdio[mdio]); +} + +/* + * Using a composite pin description, set the hardware pinmux registers + * with the corresponding values. + * Make sure to unlock write protection and reset it afterward. + * + * NOTE: There is no protection for potential concurrency, it is assumed these + * calls are serialized already. + */ +static int rzn1_set_hw_pin_func(struct rzn1_pinctrl *ipctl, unsigned int pin, + u32 pin_config, u8 use_locks) +{ + u32 l1_cache; + u32 l2_cache; + u32 l1; + u32 l2; + + /* Level 3 MDIO multiplexing */ + if (pin_config >= RZN1_FUNC_MDIO0_HIGHZ && + pin_config <= RZN1_FUNC_MDIO1_E1_SWITCH) { + int mdio_channel; + u32 mdio_func; + + if (pin_config <= RZN1_FUNC_MDIO1_HIGHZ) + mdio_channel = 0; + else + mdio_channel = 1; + + /* Get MDIO func, and convert the func to the level 2 number */ + if (pin_config <= RZN1_FUNC_MDIO0_SWITCH) { + mdio_func = pin_config - RZN1_FUNC_MDIO0_HIGHZ; + pin_config = RZN1_FUNC_ETH_MDIO; + } else if (pin_config <= RZN1_FUNC_MDIO0_E1_SWITCH) { + mdio_func = pin_config - RZN1_FUNC_MDIO0_E1_HIGHZ; + pin_config = RZN1_FUNC_ETH_MDIO_E1; + } else if (pin_config <= RZN1_FUNC_MDIO1_SWITCH) { + mdio_func = pin_config - RZN1_FUNC_MDIO1_HIGHZ; + pin_config = RZN1_FUNC_ETH_MDIO; + } else { + mdio_func = pin_config - RZN1_FUNC_MDIO1_E1_HIGHZ; + pin_config = RZN1_FUNC_ETH_MDIO_E1; + } + rzn1_pinctrl_mdio_select(ipctl, mdio_channel, mdio_func); + } + + /* Note here, we do not allow anything past the MDIO Mux values */ + if (pin >= ARRAY_SIZE(ipctl->lev1->conf) || + pin_config >= RZN1_FUNC_MDIO0_HIGHZ) + return -EINVAL; + + l1 = readl(&ipctl->lev1->conf[pin]); + l1_cache = l1; + l2 = readl(&ipctl->lev2->conf[pin]); + l2_cache = l2; + + dev_dbg(ipctl->dev, "setting func for pin %u to %u\n", pin, pin_config); + + l1 &= ~(RZN1_L1_FUNC_MASK << RZN1_L1_FUNCTION); + + if (pin_config < RZN1_FUNC_L2_OFFSET) { + l1 |= (pin_config << RZN1_L1_FUNCTION); + } else { + l1 |= (RZN1_L1_FUNCTION_L2 << RZN1_L1_FUNCTION); + + l2 = pin_config - RZN1_FUNC_L2_OFFSET; + } + + /* If either configuration changes, we update both anyway */ + if (l1 != l1_cache || l2 != l2_cache) { + writel(l1, &ipctl->lev1->conf[pin]); + writel(l2, &ipctl->lev2->conf[pin]); + } + + return 0; +} + +static const struct rzn1_pin_group *rzn1_pinctrl_find_group_by_name( + const struct rzn1_pinctrl *ipctl, const char *name) +{ + unsigned int i; + + for (i = 0; i < ipctl->ngroups; i++) { + if (!strcmp(ipctl->groups[i].name, name)) + return &ipctl->groups[i]; + } + + return NULL; +} + +static int rzn1_get_groups_count(struct pinctrl_dev *pctldev) +{ + struct rzn1_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev); + + return ipctl->ngroups; +} + +static const char *rzn1_get_group_name(struct pinctrl_dev *pctldev, + unsigned int selector) +{ + struct rzn1_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev); + + return ipctl->groups[selector].name; +} + +static int rzn1_get_group_pins(struct pinctrl_dev *pctldev, + unsigned int selector, const unsigned int **pins, + unsigned int *npins) +{ + struct rzn1_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev); + + if (selector >= ipctl->ngroups) + return -EINVAL; + + *pins = ipctl->groups[selector].pins; + *npins = ipctl->groups[selector].npins; + + return 0; +} + +/* + * This function is called for each pinctl 'Function' node. + * Sub-nodes can be used to describe multiple 'Groups' for the 'Function' + * If there aren't any sub-nodes, the 'Group' is essentially the 'Function'. + * Each 'Group' uses pinmux = <...> to detail the pins and data used to select + * the functionality. Each 'Group' has optional pin configurations that apply + * to all pins in the 'Group'. + */ +static int rzn1_dt_node_to_map_one(struct pinctrl_dev *pctldev, + struct device_node *np, + struct pinctrl_map **map, + unsigned int *num_maps) +{ + struct rzn1_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev); + const struct rzn1_pin_group *grp; + unsigned long *configs = NULL; + unsigned int reserved_maps = *num_maps; + unsigned int num_configs = 0; + unsigned int reserve = 1; + int ret; + + dev_dbg(ipctl->dev, "processing node %pOF\n", np); + + grp = rzn1_pinctrl_find_group_by_name(ipctl, np->name); + if (!grp) { + dev_err(ipctl->dev, "unable to find group for node %pOF\n", np); + + return -EINVAL; + } + + /* Get the group's pin configuration */ + ret = pinconf_generic_parse_dt_config(np, pctldev, &configs, + &num_configs); + if (ret < 0) { + dev_err(ipctl->dev, "%pOF: could not parse property\n", np); + + return ret; + } + + if (num_configs) + reserve++; + + /* Increase the number of maps to cover this group */ + ret = pinctrl_utils_reserve_map(pctldev, map, &reserved_maps, num_maps, + reserve); + if (ret < 0) + goto out; + + /* Associate the group with the function */ + ret = pinctrl_utils_add_map_mux(pctldev, map, &reserved_maps, num_maps, + grp->name, grp->func); + if (ret < 0) + goto out; + + if (num_configs) { + /* Associate the group's pin configuration with the group */ + ret = pinctrl_utils_add_map_configs(pctldev, map, + &reserved_maps, num_maps, grp->name, + configs, num_configs, + PIN_MAP_TYPE_CONFIGS_GROUP); + if (ret < 0) + goto out; + } + + dev_dbg(pctldev->dev, "maps: function %s group %s (%d pins)\n", + grp->func, grp->name, grp->npins); + +out: + kfree(configs); + + return ret; +} + +static int rzn1_dt_node_to_map(struct pinctrl_dev *pctldev, + struct device_node *np, + struct pinctrl_map **map, + unsigned int *num_maps) +{ + struct device_node *child; + int ret; + + *map = NULL; + *num_maps = 0; + + ret = rzn1_dt_node_to_map_one(pctldev, np, map, num_maps); + if (ret < 0) + return ret; + + for_each_child_of_node(np, child) { + ret = rzn1_dt_node_to_map_one(pctldev, child, map, num_maps); + if (ret < 0) { + of_node_put(child); + return ret; + } + } + + return 0; +} + +static const struct pinctrl_ops rzn1_pctrl_ops = { + .get_groups_count = rzn1_get_groups_count, + .get_group_name = rzn1_get_group_name, + .get_group_pins = rzn1_get_group_pins, + .dt_node_to_map = rzn1_dt_node_to_map, + .dt_free_map = pinctrl_utils_free_map, +}; + +static int rzn1_pmx_get_funcs_count(struct pinctrl_dev *pctldev) +{ + struct rzn1_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev); + + return ipctl->nfunctions; +} + +static const char *rzn1_pmx_get_func_name(struct pinctrl_dev *pctldev, + unsigned int selector) +{ + struct rzn1_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev); + + return ipctl->functions[selector].name; +} + +static int rzn1_pmx_get_groups(struct pinctrl_dev *pctldev, + unsigned int selector, + const char * const **groups, + unsigned int * const num_groups) +{ + struct rzn1_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev); + + *groups = ipctl->functions[selector].groups; + *num_groups = ipctl->functions[selector].num_groups; + + return 0; +} + +static int rzn1_set_mux(struct pinctrl_dev *pctldev, unsigned int selector, + unsigned int group) +{ + struct rzn1_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev); + struct rzn1_pin_group *grp = &ipctl->groups[group]; + unsigned int i, grp_pins = grp->npins; + + dev_dbg(ipctl->dev, "set mux %s(%d) group %s(%d)\n", + ipctl->functions[selector].name, selector, grp->name, group); + + rzn1_hw_set_lock(ipctl, LOCK_ALL, LOCK_ALL); + for (i = 0; i < grp_pins; i++) + rzn1_set_hw_pin_func(ipctl, grp->pins[i], grp->pin_ids[i], 0); + rzn1_hw_set_lock(ipctl, LOCK_ALL, 0); + + return 0; +} + +static const struct pinmux_ops rzn1_pmx_ops = { + .get_functions_count = rzn1_pmx_get_funcs_count, + .get_function_name = rzn1_pmx_get_func_name, + .get_function_groups = rzn1_pmx_get_groups, + .set_mux = rzn1_set_mux, +}; + +static int rzn1_pinconf_get(struct pinctrl_dev *pctldev, unsigned int pin, + unsigned long *config) +{ + struct rzn1_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev); + enum pin_config_param param = pinconf_to_config_param(*config); + static const u32 reg_drive[4] = { 4, 6, 8, 12 }; + u32 pull, drive, l1mux; + u32 l1, l2, arg = 0; + + if (pin >= ARRAY_SIZE(ipctl->lev1->conf)) + return -EINVAL; + + l1 = readl(&ipctl->lev1->conf[pin]); + + l1mux = l1 & RZN1_L1_FUNC_MASK; + pull = (l1 >> RZN1_L1_PIN_PULL) & 0x3; + drive = (l1 >> RZN1_L1_PIN_DRIVE_STRENGTH) & 0x3; + + switch (param) { + case PIN_CONFIG_BIAS_PULL_UP: + if (pull != RZN1_L1_PIN_PULL_UP) + return -EINVAL; + break; + case PIN_CONFIG_BIAS_PULL_DOWN: + if (pull != RZN1_L1_PIN_PULL_DOWN) + return -EINVAL; + break; + case PIN_CONFIG_BIAS_DISABLE: + if (pull != RZN1_L1_PIN_PULL_NONE) + return -EINVAL; + break; + case PIN_CONFIG_DRIVE_STRENGTH: + arg = reg_drive[drive]; + break; + case PIN_CONFIG_BIAS_HIGH_IMPEDANCE: + l2 = readl(&ipctl->lev2->conf[pin]); + if (l1mux == RZN1_L1_FUNCTION_L2) { + if (l2 != 0) + return -EINVAL; + } else if (l1mux != RZN1_FUNC_HIGHZ) { + return -EINVAL; + } + break; + default: + return -ENOTSUPP; + } + + *config = pinconf_to_config_packed(param, arg); + + return 0; +} + +static int rzn1_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin, + unsigned long *configs, unsigned int num_configs) +{ + struct rzn1_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev); + enum pin_config_param param; + unsigned int i; + u32 l1, l1_cache; + u32 drv; + u32 arg; + + if (pin >= ARRAY_SIZE(ipctl->lev1->conf)) + return -EINVAL; + + l1 = readl(&ipctl->lev1->conf[pin]); + l1_cache = l1; + + for (i = 0; i < num_configs; i++) { + param = pinconf_to_config_param(configs[i]); + arg = pinconf_to_config_argument(configs[i]); + + switch (param) { + case PIN_CONFIG_BIAS_PULL_UP: + dev_dbg(ipctl->dev, "set pin %d pull up\n", pin); + l1 &= ~(0x3 << RZN1_L1_PIN_PULL); + l1 |= (RZN1_L1_PIN_PULL_UP << RZN1_L1_PIN_PULL); + break; + case PIN_CONFIG_BIAS_PULL_DOWN: + dev_dbg(ipctl->dev, "set pin %d pull down\n", pin); + l1 &= ~(0x3 << RZN1_L1_PIN_PULL); + l1 |= (RZN1_L1_PIN_PULL_DOWN << RZN1_L1_PIN_PULL); + break; + case PIN_CONFIG_BIAS_DISABLE: + dev_dbg(ipctl->dev, "set pin %d bias off\n", pin); + l1 &= ~(0x3 << RZN1_L1_PIN_PULL); + l1 |= (RZN1_L1_PIN_PULL_NONE << RZN1_L1_PIN_PULL); + break; + case PIN_CONFIG_DRIVE_STRENGTH: + dev_dbg(ipctl->dev, "set pin %d drv %umA\n", pin, arg); + switch (arg) { + case 4: + drv = RZN1_L1_PIN_DRIVE_STRENGTH_4MA; + break; + case 6: + drv = RZN1_L1_PIN_DRIVE_STRENGTH_6MA; + break; + case 8: + drv = RZN1_L1_PIN_DRIVE_STRENGTH_8MA; + break; + case 12: + drv = RZN1_L1_PIN_DRIVE_STRENGTH_12MA; + break; + default: + dev_err(ipctl->dev, + "Drive strength %umA not supported\n", + arg); + + return -EINVAL; + } + + l1 &= ~(0x3 << RZN1_L1_PIN_DRIVE_STRENGTH); + l1 |= (drv << RZN1_L1_PIN_DRIVE_STRENGTH); + break; + + case PIN_CONFIG_BIAS_HIGH_IMPEDANCE: + dev_dbg(ipctl->dev, "set pin %d High-Z\n", pin); + l1 &= ~RZN1_L1_FUNC_MASK; + l1 |= RZN1_FUNC_HIGHZ; + break; + default: + return -ENOTSUPP; + } + } + + if (l1 != l1_cache) { + rzn1_hw_set_lock(ipctl, LOCK_LEVEL1, LOCK_LEVEL1); + writel(l1, &ipctl->lev1->conf[pin]); + rzn1_hw_set_lock(ipctl, LOCK_LEVEL1, 0); + } + + return 0; +} + +static int rzn1_pinconf_group_get(struct pinctrl_dev *pctldev, + unsigned int selector, + unsigned long *config) +{ + struct rzn1_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev); + struct rzn1_pin_group *grp = &ipctl->groups[selector]; + unsigned long old = 0; + unsigned int i; + + dev_dbg(ipctl->dev, "group get %s selector:%u\n", grp->name, selector); + + for (i = 0; i < grp->npins; i++) { + if (rzn1_pinconf_get(pctldev, grp->pins[i], config)) + return -ENOTSUPP; + + /* configs do not match between two pins */ + if (i && (old != *config)) + return -ENOTSUPP; + + old = *config; + } + + return 0; +} + +static int rzn1_pinconf_group_set(struct pinctrl_dev *pctldev, + unsigned int selector, + unsigned long *configs, + unsigned int num_configs) +{ + struct rzn1_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev); + struct rzn1_pin_group *grp = &ipctl->groups[selector]; + unsigned int i; + int ret; + + dev_dbg(ipctl->dev, "group set %s selector:%u configs:%p/%d\n", + grp->name, selector, configs, num_configs); + + for (i = 0; i < grp->npins; i++) { + unsigned int pin = grp->pins[i]; + + ret = rzn1_pinconf_set(pctldev, pin, configs, num_configs); + if (ret) + return ret; + } + + return 0; +} + +static const struct pinconf_ops rzn1_pinconf_ops = { + .is_generic = true, + .pin_config_get = rzn1_pinconf_get, + .pin_config_set = rzn1_pinconf_set, + .pin_config_group_get = rzn1_pinconf_group_get, + .pin_config_group_set = rzn1_pinconf_group_set, + .pin_config_config_dbg_show = pinconf_generic_dump_config, +}; + +static struct pinctrl_desc rzn1_pinctrl_desc = { + .pctlops = &rzn1_pctrl_ops, + .pmxops = &rzn1_pmx_ops, + .confops = &rzn1_pinconf_ops, + .owner = THIS_MODULE, +}; + +static int rzn1_pinctrl_parse_groups(struct device_node *np, + struct rzn1_pin_group *grp, + struct rzn1_pinctrl *ipctl) +{ + const __be32 *list; + unsigned int i; + int size; + + dev_dbg(ipctl->dev, "%s: %s\n", __func__, np->name); + + /* Initialise group */ + grp->name = np->name; + + /* + * The binding format is + * pinmux = <PIN_FUNC_ID CONFIG ...>, + * do sanity check and calculate pins number + */ + list = of_get_property(np, RZN1_PINS_PROP, &size); + if (!list) { + dev_err(ipctl->dev, + "no " RZN1_PINS_PROP " property in node %pOF\n", np); + + return -EINVAL; + } + + if (!size) { + dev_err(ipctl->dev, "Invalid " RZN1_PINS_PROP " in node %pOF\n", + np); + + return -EINVAL; + } + + grp->npins = size / sizeof(list[0]); + grp->pin_ids = devm_kmalloc_array(ipctl->dev, + grp->npins, sizeof(grp->pin_ids[0]), + GFP_KERNEL); + grp->pins = devm_kmalloc_array(ipctl->dev, + grp->npins, sizeof(grp->pins[0]), + GFP_KERNEL); + if (!grp->pin_ids || !grp->pins) + return -ENOMEM; + + for (i = 0; i < grp->npins; i++) { + u32 pin_id = be32_to_cpu(*list++); + + grp->pins[i] = pin_id & 0xff; + grp->pin_ids[i] = (pin_id >> 8) & 0x7f; + } + + return grp->npins; +} + +static int rzn1_pinctrl_count_function_groups(struct device_node *np) +{ + struct device_node *child; + int count = 0; + + if (of_property_count_u32_elems(np, RZN1_PINS_PROP) > 0) + count++; + + for_each_child_of_node(np, child) { + if (of_property_count_u32_elems(child, RZN1_PINS_PROP) > 0) + count++; + } + + return count; +} + +static int rzn1_pinctrl_parse_functions(struct device_node *np, + struct rzn1_pinctrl *ipctl, + unsigned int index) +{ + struct rzn1_pmx_func *func; + struct rzn1_pin_group *grp; + struct device_node *child; + unsigned int i = 0; + int ret; + + func = &ipctl->functions[index]; + + /* Initialise function */ + func->name = np->name; + func->num_groups = rzn1_pinctrl_count_function_groups(np); + if (func->num_groups == 0) { + dev_err(ipctl->dev, "no groups defined in %pOF\n", np); + return -EINVAL; + } + dev_dbg(ipctl->dev, "function %s has %d groups\n", + np->name, func->num_groups); + + func->groups = devm_kmalloc_array(ipctl->dev, + func->num_groups, sizeof(char *), + GFP_KERNEL); + if (!func->groups) + return -ENOMEM; + + if (of_property_count_u32_elems(np, RZN1_PINS_PROP) > 0) { + func->groups[i] = np->name; + grp = &ipctl->groups[ipctl->ngroups]; + grp->func = func->name; + ret = rzn1_pinctrl_parse_groups(np, grp, ipctl); + if (ret < 0) + return ret; + i++; + ipctl->ngroups++; + } + + for_each_child_of_node(np, child) { + func->groups[i] = child->name; + grp = &ipctl->groups[ipctl->ngroups]; + grp->func = func->name; + ret = rzn1_pinctrl_parse_groups(child, grp, ipctl); + if (ret < 0) { + of_node_put(child); + return ret; + } + i++; + ipctl->ngroups++; + } + + dev_dbg(ipctl->dev, "function %s parsed %u/%u groups\n", + np->name, i, func->num_groups); + + return 0; +} + +static int rzn1_pinctrl_probe_dt(struct platform_device *pdev, + struct rzn1_pinctrl *ipctl) +{ + struct device_node *np = pdev->dev.of_node; + struct device_node *child; + unsigned int maxgroups = 0; + unsigned int i = 0; + int nfuncs = 0; + int ret; + + nfuncs = of_get_child_count(np); + if (nfuncs <= 0) + return 0; + + ipctl->nfunctions = nfuncs; + ipctl->functions = devm_kmalloc_array(&pdev->dev, nfuncs, + sizeof(*ipctl->functions), + GFP_KERNEL); + if (!ipctl->functions) + return -ENOMEM; + + ipctl->ngroups = 0; + for_each_child_of_node(np, child) + maxgroups += rzn1_pinctrl_count_function_groups(child); + + ipctl->groups = devm_kmalloc_array(&pdev->dev, + maxgroups, + sizeof(*ipctl->groups), + GFP_KERNEL); + if (!ipctl->groups) + return -ENOMEM; + + for_each_child_of_node(np, child) { + ret = rzn1_pinctrl_parse_functions(child, ipctl, i++); + if (ret < 0) { + of_node_put(child); + return ret; + } + } + + return 0; +} + +static int rzn1_pinctrl_probe(struct platform_device *pdev) +{ + struct rzn1_pinctrl *ipctl; + struct resource *res; + int ret; + + /* Create state holders etc for this driver */ + ipctl = devm_kzalloc(&pdev->dev, sizeof(*ipctl), GFP_KERNEL); + if (!ipctl) + return -ENOMEM; + + ipctl->mdio_func[0] = -1; + ipctl->mdio_func[1] = -1; + + ipctl->lev1 = devm_platform_get_and_ioremap_resource(pdev, 0, &res); + if (IS_ERR(ipctl->lev1)) + return PTR_ERR(ipctl->lev1); + ipctl->lev1_protect_phys = (u32)res->start + 0x400; + + ipctl->lev2 = devm_platform_get_and_ioremap_resource(pdev, 1, &res); + if (IS_ERR(ipctl->lev2)) + return PTR_ERR(ipctl->lev2); + ipctl->lev2_protect_phys = (u32)res->start + 0x400; + + ipctl->clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(ipctl->clk)) + return PTR_ERR(ipctl->clk); + ret = clk_prepare_enable(ipctl->clk); + if (ret) + return ret; + + ipctl->dev = &pdev->dev; + rzn1_pinctrl_desc.name = dev_name(&pdev->dev); + rzn1_pinctrl_desc.pins = rzn1_pins; + rzn1_pinctrl_desc.npins = ARRAY_SIZE(rzn1_pins); + + ret = rzn1_pinctrl_probe_dt(pdev, ipctl); + if (ret) { + dev_err(&pdev->dev, "fail to probe dt properties\n"); + goto err_clk; + } + + platform_set_drvdata(pdev, ipctl); + + ret = devm_pinctrl_register_and_init(&pdev->dev, &rzn1_pinctrl_desc, + ipctl, &ipctl->pctl); + if (ret) { + dev_err(&pdev->dev, "could not register rzn1 pinctrl driver\n"); + goto err_clk; + } + + ret = pinctrl_enable(ipctl->pctl); + if (ret) + goto err_clk; + + dev_info(&pdev->dev, "probed\n"); + + return 0; + +err_clk: + clk_disable_unprepare(ipctl->clk); + + return ret; +} + +static int rzn1_pinctrl_remove(struct platform_device *pdev) +{ + struct rzn1_pinctrl *ipctl = platform_get_drvdata(pdev); + + clk_disable_unprepare(ipctl->clk); + + return 0; +} + +static const struct of_device_id rzn1_pinctrl_match[] = { + { .compatible = "renesas,rzn1-pinctrl", }, + {} +}; +MODULE_DEVICE_TABLE(of, rzn1_pinctrl_match); + +static struct platform_driver rzn1_pinctrl_driver = { + .probe = rzn1_pinctrl_probe, + .remove = rzn1_pinctrl_remove, + .driver = { + .name = "rzn1-pinctrl", + .of_match_table = rzn1_pinctrl_match, + }, +}; + +static int __init _pinctrl_drv_register(void) +{ + return platform_driver_register(&rzn1_pinctrl_driver); +} +subsys_initcall(_pinctrl_drv_register); + +MODULE_AUTHOR("Phil Edworthy <phil.edworthy@renesas.com>"); +MODULE_DESCRIPTION("Renesas RZ/N1 pinctrl driver"); +MODULE_LICENSE("GPL v2"); |