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Mon, 13 May 2024 11:37:47 +0000 From: "Peng Fan (OSS)" Date: Mon, 13 May 2024 19:45:26 +0800 Subject: [PATCH v6 3/3] pinctrl: imx: support SCMI pinctrl protocol for i.MX95 Message-Id: <20240513-pinctrl-scmi-oem-v3-v6-3-904975c99cc4@nxp.com> References: <20240513-pinctrl-scmi-oem-v3-v6-0-904975c99cc4@nxp.com> In-Reply-To: <20240513-pinctrl-scmi-oem-v3-v6-0-904975c99cc4@nxp.com> To: Sudeep Holla , Cristian Marussi , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Shawn Guo , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , Linus Walleij , Dong Aisheng , Jacky Bai Cc: linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, imx@lists.linux.dev, linux-gpio@vger.kernel.org, Peng Fan X-Mailer: b4 0.12.3 X-Developer-Signature: v=1; a=ed25519-sha256; t=1715600734; l=17862; i=peng.fan@nxp.com; s=20230812; h=from:subject:message-id; bh=bUQerR9OSusu69bAUDnPuLZQLR6f6dhZGyyGnUKiybY=; b=5FbNxTYd/fXr7rcIoB1Yn5nE38lR+SSdw/J7JJB/I66krOXWMu4VqkHfukc/M2G++9+WoSvcy PThbhJ8JOJRBPVa0VuJCLmXIug+IJSdmpXvfx/zwevylhbSWK11nCV+ X-Developer-Key: i=peng.fan@nxp.com; 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Signed-off-by: Peng Fan --- drivers/pinctrl/freescale/Kconfig | 9 + drivers/pinctrl/freescale/Makefile | 1 + drivers/pinctrl/freescale/pinctrl-imx-scmi.c | 579 +++++++++++++++++++++++++++ 3 files changed, 589 insertions(+) diff --git a/drivers/pinctrl/freescale/Kconfig b/drivers/pinctrl/freescale/Kconfig index 27bdc548f3a7..711a5ab3ceb1 100644 --- a/drivers/pinctrl/freescale/Kconfig +++ b/drivers/pinctrl/freescale/Kconfig @@ -7,6 +7,15 @@ config PINCTRL_IMX select PINCONF select REGMAP +config PINCTRL_IMX_SCMI + tristate "i.MX95 pinctrl driver using SCMI protocol interface" + depends on ARM_SCMI_PROTOCOL && OF || COMPILE_TEST + select PINMUX + select GENERIC_PINCONF + help + i.MX95 SCMI firmware provides pinctrl protocol. This driver + utilizes the SCMI interface to do pinctrl configuration. + config PINCTRL_IMX_SCU tristate depends on IMX_SCU diff --git a/drivers/pinctrl/freescale/Makefile b/drivers/pinctrl/freescale/Makefile index 647dff060477..e79b4b06e71b 100644 --- a/drivers/pinctrl/freescale/Makefile +++ b/drivers/pinctrl/freescale/Makefile @@ -2,6 +2,7 @@ # Freescale pin control drivers obj-$(CONFIG_PINCTRL_IMX) += pinctrl-imx.o obj-$(CONFIG_PINCTRL_IMX_SCU) += pinctrl-scu.o +obj-$(CONFIG_PINCTRL_IMX_SCMI) += pinctrl-imx-scmi.o obj-$(CONFIG_PINCTRL_IMX1_CORE) += pinctrl-imx1-core.o obj-$(CONFIG_PINCTRL_IMX1) += pinctrl-imx1.o obj-$(CONFIG_PINCTRL_IMX27) += pinctrl-imx27.o diff --git a/drivers/pinctrl/freescale/pinctrl-imx-scmi.c b/drivers/pinctrl/freescale/pinctrl-imx-scmi.c new file mode 100644 index 000000000000..e5ecde1ed4e9 --- /dev/null +++ b/drivers/pinctrl/freescale/pinctrl-imx-scmi.c @@ -0,0 +1,579 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * System Control and Power Interface (SCMI) Protocol based i.MX pinctrl driver + * + * Copyright 2024 NXP + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include + +#include "../pinctrl-utils.h" +#include "../core.h" +#include "../pinconf.h" +#include "../pinmux.h" + +#define DRV_NAME "scmi-pinctrl-imx" + +#define SCMI_NUM_CONFIGS 4 + +struct scmi_pinctrl_imx { + struct device *dev; + struct scmi_protocol_handle *ph; + struct pinctrl_dev *pctldev; + struct pinctrl_desc pctl_desc; + struct pinfunction *functions; + unsigned int nfunctions; + struct pinctrl_pin_desc *pins; + unsigned int nr_pins; + const struct scmi_pinctrl_proto_ops *ops; + unsigned int grp_index; + struct pingroup *groups; + unsigned int ngroups; +}; + +/* SCMI pin control types, aligned with SCMI firmware */ +#define IMX_SCMI_NUM_CFG 4 +#define IMX_SCMI_PIN_MUX 192 +#define IMX_SCMI_PIN_CONFIG 193 +#define IMX_SCMI_PIN_DAISY_ID 194 +#define IMX_SCMI_PIN_DAISY_CFG 195 + +/* + * pinmux format: + * pin[31:21]|mux[20:16]|daisy_value[15:12]|daisy_valid[11:11]|daisy_id[10:0] + */ +#define IMX_PIN_ID_MASK GENMASK(31, 21) +#define IMX_PIN_MUX_MASK GENMASK(20, 16) +#define IMX_PIN_DAISY_VAL_MASK GENMASK(15, 12) +#define IMX_PIN_DAISY_VALID BIT(11) +#define IMX_PIN_DAISY_ID_MASK GENMASK(10, 0) + +static inline u32 get_pin_no(u32 pinmux) +{ + return FIELD_GET(IMX_PIN_ID_MASK, pinmux); +} + +static inline u32 get_pin_func(u32 pinmux) +{ + return FIELD_GET(IMX_PIN_MUX_MASK, pinmux); +} + +static inline u32 get_pin_daisy_valid(u32 pinmux) +{ + return FIELD_GET(IMX_PIN_DAISY_VALID, pinmux); +} + +static inline u32 get_pin_daisy_val(u32 pinmux) +{ + return FIELD_GET(IMX_PIN_DAISY_VAL_MASK, pinmux); +} + +static inline u32 get_pin_daisy_no(u32 pinmux) +{ + return FIELD_GET(IMX_PIN_DAISY_ID_MASK, pinmux); +} + +static int pinctrl_scmi_imx_map_pinconf_type(enum pin_config_param param, + u32 *mask, u32 *shift) +{ + u32 arg = param; + + switch (arg) { + case PIN_CONFIG_INPUT_SCHMITT_ENABLE: + *mask = BIT(12); + *shift = 12; + break; + case PIN_CONFIG_DRIVE_OPEN_DRAIN: + *mask = BIT(11); + *shift = 11; + break; + case PIN_CONFIG_BIAS_PULL_DOWN: + *mask = BIT(10); + *shift = 10; + break; + case PIN_CONFIG_BIAS_PULL_UP: + *mask = BIT(9); + *shift = 9; + break; + case PIN_CONFIG_SLEW_RATE: + *mask = GENMASK(8, 7); + *shift = 7; + break; + case PIN_CONFIG_DRIVE_STRENGTH: + *mask = GENMASK(6, 1); + *shift = 1; + break; + default: + return -EINVAL; + } + + return 0; +} + +static int pinctrl_scmi_imx_dt_group_node_to_map(struct pinctrl_dev *pctldev, + struct device_node *np, + struct pinctrl_map **map, + unsigned int *reserved_maps, + unsigned int *num_maps, + const char *func_name) +{ + struct device *dev = pctldev->dev; + unsigned long *cfgs = NULL; + unsigned int n_cfgs, reserve = 1; + int i, n_pins, ret; + u32 ncfg, val, mask, shift, pin_conf, pinmux_group; + unsigned long cfg[IMX_SCMI_NUM_CFG]; + enum pin_config_param param; + struct property *prop; + const __be32 *p; + + n_pins = of_property_count_u32_elems(np, "pinmux"); + if (n_pins < 0) { + dev_warn(dev, "Can't find 'pinmux' property in node %pOFn\n", np); + return -EINVAL; + } else if (!n_pins) { + return -EINVAL; + } + + ret = pinconf_generic_parse_dt_config(np, pctldev, &cfgs, &n_cfgs); + if (ret) { + dev_err(dev, "%pOF: could not parse node property\n", np); + return ret; + } + + pin_conf = 0; + for (i = 0; i < n_cfgs; i++) { + param = pinconf_to_config_param(cfgs[i]); + ret = pinctrl_scmi_imx_map_pinconf_type(param, &mask, &shift); + if (ret) { + dev_err(dev, "Error map pinconf_type %d\n", ret); + goto free_cfgs; + } + + val = pinconf_to_config_argument(cfgs[i]); + + pin_conf |= (val << shift) & mask; + + } + + reserve = n_pins * (1 + n_cfgs); + + ret = pinctrl_utils_reserve_map(pctldev, map, reserved_maps, num_maps, + reserve); + if (ret < 0) + goto free_cfgs; + + of_property_for_each_u32(np, "pinmux", prop, p, pinmux_group) { + u32 pin_id, pin_func, daisy_id, daisy_val, daisy_valid; + const char *pin_name; + + i = 0; + ncfg = IMX_SCMI_NUM_CFG; + pin_id = get_pin_no(pinmux_group); + pin_func = get_pin_func(pinmux_group); + daisy_id = get_pin_daisy_no(pinmux_group); + daisy_val = get_pin_daisy_val(pinmux_group); + cfg[i++] = pinconf_to_config_packed(IMX_SCMI_PIN_MUX, pin_func); + cfg[i++] = pinconf_to_config_packed(IMX_SCMI_PIN_CONFIG, pin_conf); + + daisy_valid = get_pin_daisy_valid(pinmux_group); + if (daisy_valid) { + cfg[i++] = pinconf_to_config_packed(IMX_SCMI_PIN_DAISY_ID, + daisy_id); + cfg[i++] = pinconf_to_config_packed(IMX_SCMI_PIN_DAISY_CFG, + daisy_val); + } else { + ncfg -= 2; + } + + pin_name = pin_get_name(pctldev, pin_id); + + dev_dbg(dev, "pin: %s, pin_conf: 0x%x, daisy_id: %u, daisy_val: 0x%x\n", + pin_name, pin_conf, daisy_id, daisy_val); + + ret = pinctrl_utils_add_map_configs(pctldev, map, reserved_maps, + num_maps, pin_name, + cfg, ncfg, + PIN_MAP_TYPE_CONFIGS_PIN); + if (ret < 0) + goto free_cfgs; + }; + +free_cfgs: + kfree(cfgs); + return ret; +} + +static int pinctrl_scmi_imx_dt_node_to_map(struct pinctrl_dev *pctldev, + struct device_node *np_config, + struct pinctrl_map **map, + unsigned int *num_maps) + +{ + unsigned int reserved_maps; + int ret; + + reserved_maps = 0; + *map = NULL; + *num_maps = 0; + + for_each_available_child_of_node_scoped(np_config, np) { + ret = pinctrl_scmi_imx_dt_group_node_to_map(pctldev, np, map, + &reserved_maps, + num_maps, + np_config->name); + if (ret < 0) { + pinctrl_utils_free_map(pctldev, *map, *num_maps); + return ret; + } + } + + return 0; +} + +static const struct pinctrl_ops pinctrl_scmi_imx_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 = pinctrl_scmi_imx_dt_node_to_map, + .dt_free_map = pinconf_generic_dt_free_map, +}; + +static int pinctrl_scmi_imx_func_set_mux(struct pinctrl_dev *pctldev, + unsigned int selector, unsigned int group) +{ + /* + * For i.MX SCMI PINCTRL , postpone the mux setting + * until config is set as they can be set together + * in one IPC call + */ + return 0; +} + +static const struct pinmux_ops pinctrl_scmi_imx_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 = pinctrl_scmi_imx_func_set_mux, +}; + +static int pinctrl_scmi_imx_pinconf_get(struct pinctrl_dev *pctldev, + unsigned int pin, unsigned long *config) +{ + int ret; + struct scmi_pinctrl_imx *pmx = pinctrl_dev_get_drvdata(pctldev); + enum pin_config_param config_type; + u32 mask, val, shift; + u32 config_value; + + if (!config) + return -EINVAL; + + config_type = pinconf_to_config_param(*config); + + ret = pinctrl_scmi_imx_map_pinconf_type(config_type, &mask, &shift); + if (ret) + return ret; + + ret = pmx->ops->settings_get_one(pmx->ph, pin, PIN_TYPE, + IMX_SCMI_PIN_CONFIG, &val); + /* Convert SCMI error code to PINCTRL expected error code */ + if (ret == -EOPNOTSUPP) + return -ENOTSUPP; + if (ret) + return ret; + + config_value = (val & mask) >> shift; + *config = pinconf_to_config_packed(config_type, config_value); + + dev_dbg(pmx->dev, "pin:%s, conf:0x%x, type: %d, val: %u", + pin_get_name(pctldev, pin), val, config_type, config_value); + + return 0; +} + +static int pinctrl_scmi_imx_pinconf_set(struct pinctrl_dev *pctldev, + unsigned int pin, + unsigned long *configs, + unsigned int num_configs) +{ + struct scmi_pinctrl_imx *pmx = pinctrl_dev_get_drvdata(pctldev); + enum scmi_pinctrl_conf_type config_type[SCMI_NUM_CONFIGS]; + u32 config_value[SCMI_NUM_CONFIGS]; + enum scmi_pinctrl_conf_type *p_config_type = config_type; + u32 *p_config_value = config_value; + int ret; + int i; + + if (!configs || !num_configs) + return -EINVAL; + + if (num_configs > SCMI_NUM_CONFIGS) { + dev_err(pmx->dev, "num_configs(%d) too large\n", num_configs); + return -EINVAL; + } + + for (i = 0; i < num_configs; i++) { + /* cast to avoid build warning */ + p_config_type[i] = + (enum scmi_pinctrl_conf_type)pinconf_to_config_param(configs[i]); + p_config_value[i] = pinconf_to_config_argument(configs[i]); + + dev_err(pmx->dev, "pin: %u, type: %u, val: 0x%x\n", + pin, p_config_type[i], p_config_value[i]); + } + + ret = pmx->ops->settings_conf(pmx->ph, pin, PIN_TYPE, num_configs, + p_config_type, p_config_value); + if (ret) + dev_err(pmx->dev, "Error set config %d\n", ret); + + return ret; +} + +static const struct pinconf_ops pinctrl_scmi_imx_pinconf_ops = { + .is_generic = true, + .pin_config_get = pinctrl_scmi_imx_pinconf_get, + .pin_config_set = pinctrl_scmi_imx_pinconf_set, + .pin_config_config_dbg_show = pinconf_generic_dump_config, +}; + +static int scmi_pinctrl_imx_parse_groups(struct device_node *np, + struct pingroup *grp, + struct scmi_pinctrl_imx *pmx) +{ + const __be32 *p; + struct device *dev; + struct property *prop; + unsigned int *pins; + int npins; + u32 i = 0, pinmux; + + dev = pmx->dev; + + dev_dbg(dev, "group: %pOFn\n", np); + + /* Initialise group */ + grp->name = np->name; + + npins = of_property_count_elems_of_size(np, "pinmux", sizeof(u32)); + if (npins < 0) { + dev_err(dev, "Failed to read 'pinmux' property in node %s.\n", + grp->name); + return npins; + } + if (!npins) { + dev_err(dev, "The group %s has no pins.\n", grp->name); + return -EINVAL; + } + + grp->npins = npins; + + pins = devm_kcalloc(pmx->dev, npins, sizeof(*pins), GFP_KERNEL); + if (!pins) + return -ENOMEM; + + i = 0; + of_property_for_each_u32(np, "pinmux", prop, p, pinmux) { + pins[i] = get_pin_no(pinmux); + dev_dbg(pmx->dev, "pin reg: 0x%x", pins[i] * 4); + i++; + } + + grp->pins = pins; + + return 0; +} + +static int scmi_pinctrl_imx_parse_functions(struct device_node *np, + struct scmi_pinctrl_imx *pmx, + u32 index) +{ + struct pinfunction *func; + struct pingroup *grp; + const char **groups; + u32 i = 0; + int ret = 0; + + dev_dbg(pmx->dev, "parse function(%u): %pOFn\n", index, np); + + func = &pmx->functions[index]; + + /* Initialise function */ + func->name = np->name; + func->ngroups = of_get_child_count(np); + if (func->ngroups == 0) { + dev_err(pmx->dev, "no groups defined in %pOF\n", np); + return -EINVAL; + } + + groups = devm_kcalloc(pmx->dev, func->ngroups, sizeof(*func->groups), + GFP_KERNEL); + if (!groups) + return -ENOMEM; + + for_each_child_of_node_scoped(np, child) { + groups[i] = child->name; + grp = &pmx->groups[pmx->grp_index++]; + ret = scmi_pinctrl_imx_parse_groups(child, grp, pmx); + if (ret) + return ret; + i++; + } + + func->groups = groups; + + return 0; +} + +static int scmi_pinctrl_imx_probe_dt(struct scmi_device *sdev, + struct scmi_pinctrl_imx *pmx) +{ + int i, ret, nfuncs; + struct device_node *np = sdev->dev.of_node; + + pmx->dev = &sdev->dev; + + nfuncs = of_get_child_count(np); + if (nfuncs <= 0) { + dev_err(&sdev->dev, "no functions defined\n"); + return -EINVAL; + } + + pmx->nfunctions = nfuncs; + pmx->functions = devm_kcalloc(&sdev->dev, nfuncs, + sizeof(*pmx->functions), GFP_KERNEL); + if (!pmx->functions) + return -ENOMEM; + + pmx->ngroups = 0; + for_each_child_of_node_scoped(np, child) + pmx->ngroups += of_get_child_count(child); + + pmx->groups = devm_kcalloc(&sdev->dev, pmx->ngroups, + sizeof(*pmx->groups), GFP_KERNEL); + if (!pmx->groups) + return -ENOMEM; + + i = 0; + for_each_child_of_node_scoped(np, child) { + ret = scmi_pinctrl_imx_parse_functions(child, pmx, i++); + if (ret) + return ret; + } + + return 0; +} + +static int +scmi_pinctrl_imx_get_pins(struct scmi_pinctrl_imx *pmx, struct pinctrl_desc *desc) +{ + struct pinctrl_pin_desc *pins; + unsigned int npins; + int ret, i; + + npins = pmx->ops->count_get(pmx->ph, PIN_TYPE); + pins = devm_kmalloc_array(pmx->dev, npins, sizeof(*pins), GFP_KERNEL); + if (!pins) + return -ENOMEM; + + for (i = 0; i < npins; i++) { + pins[i].number = i; + /* no need free name, firmware driver handles it */ + ret = pmx->ops->name_get(pmx->ph, i, PIN_TYPE, &pins[i].name); + if (ret) + return dev_err_probe(pmx->dev, ret, + "Can't get name for pin %d", i); + } + + desc->npins = npins; + desc->pins = pins; + dev_dbg(pmx->dev, "got pins %u", npins); + + return 0; +} + +static const char * const scmi_pinctrl_imx_allowlist[] = { + "fsl,imx95", + NULL +}; + +static int scmi_pinctrl_imx_probe(struct scmi_device *sdev) +{ + struct device *dev = &sdev->dev; + const struct scmi_handle *handle = sdev->handle; + struct scmi_pinctrl_imx *pmx; + struct scmi_protocol_handle *ph; + const struct scmi_pinctrl_proto_ops *pinctrl_ops; + int ret; + + if (!handle) + return -EINVAL; + + if (!of_machine_compatible_match(scmi_pinctrl_imx_allowlist)) + return -ENODEV; + + pinctrl_ops = handle->devm_protocol_get(sdev, SCMI_PROTOCOL_PINCTRL, &ph); + if (IS_ERR(pinctrl_ops)) + return PTR_ERR(pinctrl_ops); + + pmx = devm_kzalloc(dev, sizeof(*pmx), GFP_KERNEL); + if (!pmx) + return -ENOMEM; + + pmx->ph = ph; + pmx->ops = pinctrl_ops; + + pmx->dev = dev; + pmx->pctl_desc.name = DRV_NAME; + pmx->pctl_desc.owner = THIS_MODULE; + pmx->pctl_desc.pctlops = &pinctrl_scmi_imx_pinctrl_ops; + pmx->pctl_desc.pmxops = &pinctrl_scmi_imx_pinmux_ops; + pmx->pctl_desc.confops = &pinctrl_scmi_imx_pinconf_ops; + + ret = scmi_pinctrl_imx_get_pins(pmx, &pmx->pctl_desc); + if (ret) + return ret; + + ret = scmi_pinctrl_imx_probe_dt(sdev, pmx); + if (ret) + return ret; + + ret = devm_pinctrl_register_and_init(dev, &pmx->pctl_desc, pmx, + &pmx->pctldev); + if (ret) + return dev_err_probe(dev, ret, "Failed to register pinctrl\n"); + + return pinctrl_enable(pmx->pctldev); +} + +static const struct scmi_device_id scmi_id_table[] = { + { SCMI_PROTOCOL_PINCTRL, "pinctrl-imx" }, + { } +}; +MODULE_DEVICE_TABLE(scmi, scmi_id_table); + +static struct scmi_driver scmi_pinctrl_imx_driver = { + .name = DRV_NAME, + .probe = scmi_pinctrl_imx_probe, + .id_table = scmi_id_table, +}; +module_scmi_driver(scmi_pinctrl_imx_driver); + +MODULE_AUTHOR("Peng Fan "); +MODULE_DESCRIPTION("i.MX SCMI pin controller driver"); +MODULE_LICENSE("GPL");