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Message-ID: <1488e936-d906-41d7-ae97-ffdbcc53b08c@linaro.org>
Date: Mon, 16 Sep 2024 17:58:18 +0200
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Ze Huang <18771902331@....com>, Linus Walleij <linus.walleij@...aro.org>,
Rob Herring <robh@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Conor Dooley <conor+dt@...nel.org>, Paul Walmsley
<paul.walmsley@...ive.com>, Palmer Dabbelt <palmer@...belt.com>,
Albert Ou <aou@...s.berkeley.edu>, Yangyu Chen <cyy@...self.name>
Cc: linux-gpio@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org
Subject: Re: [RESEND PATCH 2/3] pinctrl: canaan: Add support for k230 SoC
On 16/09/2024 08:47, Ze Huang wrote:
> Configuration of the K230 is similar to that of the K210. However, in K210,
> the 256 functions for each pin are shared, whereas in K230, multiplex
> functions are different for every pin.
>
> Signed-off-by: Ze Huang <18771902331@....com>
> ---
> drivers/pinctrl/Kconfig | 10 +
> drivers/pinctrl/Makefile | 1 +
> drivers/pinctrl/pinctrl-k230.c | 674 +++++++++++++++++++++++++++++++++
> 3 files changed, 685 insertions(+)
> create mode 100644 drivers/pinctrl/pinctrl-k230.c
...
> +
> +struct k230_pinctrl {
> + struct pinctrl_desc pctl;
> + struct pinctrl_dev *pctl_dev;
> + struct regmap *regmap_base;
> + void __iomem *base;
> + struct k230_pin_group *groups;
> + unsigned int ngroups;
> + struct k230_pmx_func *functions;
> + unsigned int nfunctions;
> +};
> +
> +static struct regmap_config k230_regmap_config = {
Why is this not a const?
> + .reg_bits = 32,
> + .val_bits = 32,
> + .max_register = 0x100,
> + .reg_stride = 4,
> +};
> +
> +static int k230_get_groups_count(struct pinctrl_dev *pctldev)
> +{
> + struct k230_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
> +
> + return info->ngroups;
> +}
> +
> +static const char *k230_get_group_name(struct pinctrl_dev *pctldev,
> + unsigned int selector)
> +{
> + struct k230_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
> +
> + return info->groups[selector].name;
> +}
> +
> +static int k230_get_group_pins(struct pinctrl_dev *pctldev,
> + unsigned int selector,
> + const unsigned int **pins,
> + unsigned int *num_pins)
> +{
> + struct k230_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
> +
> + if (selector >= info->ngroups)
> + return -EINVAL;
> +
> + *pins = info->groups[selector].pins;
> + *num_pins = info->groups[selector].num_pins;
> +
> + return 0;
> +}
> +
> +static inline const struct k230_pmx_func *k230_name_to_funtion(
> + const struct k230_pinctrl *info, const char *name)
> +{
> + unsigned int i;
> +
> + for (i = 0; i < info->nfunctions; i++) {
> + if (!strcmp(info->functions[i].name, name))
> + return &info->functions[i];
> + }
> +
> + return NULL;
> +}
> +
> +static int k230_pinctrl_parse_groups(struct device_node *np,
> + struct k230_pin_group *grp,
> + struct k230_pinctrl *info,
> + unsigned int index)
> +{
> + struct device *dev = info->pctl_dev->dev;
> + const __be32 *list;
> + int size, i, ret;
> +
> + grp->name = np->name;
> +
> + list = of_get_property(np, "pinmux", &size);
> + size /= sizeof(*list);
> +
> + grp->num_pins = size;
> + grp->pins = devm_kcalloc(dev, grp->num_pins, sizeof(*grp->pins),
> + GFP_KERNEL);
> + grp->data = devm_kcalloc(dev, grp->num_pins, sizeof(*grp->data),
> + GFP_KERNEL);
> + if (!grp->pins || !grp->data)
> + return -ENOMEM;
> +
> + for (i = 0; i < size; i++) {
> + unsigned int mux_data = be32_to_cpu(*list++);
> +
> + grp->pins[i] = (mux_data >> 8);
> + grp->data[i].func = (mux_data & 0xff);
> +
> + ret = pinconf_generic_parse_dt_config(np, NULL,
> + &grp->data[i].configs,
> + &grp->data[i].nconfigs);
> + if (ret)
> + return ret;
> + }
> + of_node_put(np);
> +
This looks like double free. There is no get in this scope.
> + return 0;
> +}
> +
> +static void k230_pinctrl_child_count(struct k230_pinctrl *info,
> + struct device_node *np)
> +{
> + struct device_node *child;
> +
> + for_each_child_of_node(np, child) {
> + info->nfunctions++;
> + info->ngroups += of_get_child_count(child);
> + }
> +}
> +
> +static int k230_pinctrl_parse_functions(struct device_node *np,
> + struct k230_pinctrl *info,
> + unsigned int index)
> +{
> + struct device *dev = info->pctl_dev->dev;
> + struct k230_pmx_func *func;
> + struct k230_pin_group *grp;
> + struct device_node *child;
> + static unsigned int idx, i;
> + int ret;
> +
> + func = &info->functions[index];
> +
> + func->name = np->name;
> + func->ngroups = of_get_child_count(np);
> + if (func->ngroups <= 0)
> + return 0;
> +
> + func->groups = devm_kcalloc(dev, func->ngroups,
> + sizeof(*func->groups), GFP_KERNEL);
> + func->group_idx = devm_kcalloc(dev, func->ngroups,
> + sizeof(*func->group_idx), GFP_KERNEL);
> + if (!func->groups || !func->group_idx)
> + return -ENOMEM;
> +
> + i = 0;
> +
> + for_each_child_of_node(np, child) {
> + func->groups[i] = child->name;
> + func->group_idx[i] = idx;
> + grp = &info->groups[idx];
> + idx++;
> + ret = k230_pinctrl_parse_groups(child, grp, info, i++);
> + if (ret) {
> + of_node_put(child);
Use scoped loop instead.
> + return ret;
> + }
> + }
> +
> + return 0;
> +}
> +
> +static int k230_pinctrl_parse_dt(struct platform_device *pdev,
> + struct k230_pinctrl *info)
Please keep all probe related code next to each other. That's quite
confusing to find probe code far away from the probe().
> +{
> + struct device *dev = &pdev->dev;
> + struct device_node *np = dev->of_node;
> + struct device_node *child;
> + unsigned int i;
> + int ret;
> +
> + k230_pinctrl_child_count(info, np);
> +
> + info->functions = devm_kcalloc(dev, info->nfunctions,
> + sizeof(*info->functions), GFP_KERNEL);
> + info->groups = devm_kcalloc(dev, info->ngroups,
> + sizeof(*info->groups), GFP_KERNEL);
> + if (!info->functions || !info->groups)
> + return -ENOMEM;
> +
> + i = 0;
> +
> + for_each_child_of_node(np, child) {
> + ret = k230_pinctrl_parse_functions(child, info, i++);
> + if (ret) {
> + dev_err(dev, "failed to parse function\n");
> + of_node_put(child);
Use scoped loop instead.
> + return ret;
> + }
> + }
> +
> + return 0;
> +}
> +
> +static struct pinctrl_pin_desc k230_pins[] = {
Why is this not a const?
> + PINCTRL_PIN(0, "IO0"), PINCTRL_PIN(1, "IO1"), PINCTRL_PIN(2, "IO2"),
> + PINCTRL_PIN(3, "IO3"), PINCTRL_PIN(4, "IO4"), PINCTRL_PIN(5, "IO5"),
> + PINCTRL_PIN(6, "IO6"), PINCTRL_PIN(7, "IO7"), PINCTRL_PIN(8, "IO8"),
> + PINCTRL_PIN(9, "IO9"), PINCTRL_PIN(10, "IO10"), PINCTRL_PIN(11, "IO11"),
> + PINCTRL_PIN(12, "IO12"), PINCTRL_PIN(13, "IO13"), PINCTRL_PIN(14, "IO14"),
> + PINCTRL_PIN(15, "IO15"), PINCTRL_PIN(16, "IO16"), PINCTRL_PIN(17, "IO17"),
> + PINCTRL_PIN(18, "IO18"), PINCTRL_PIN(19, "IO19"), PINCTRL_PIN(20, "IO20"),
> + PINCTRL_PIN(21, "IO21"), PINCTRL_PIN(22, "IO22"), PINCTRL_PIN(23, "IO23"),
> + PINCTRL_PIN(24, "IO24"), PINCTRL_PIN(25, "IO25"), PINCTRL_PIN(26, "IO26"),
> + PINCTRL_PIN(27, "IO27"), PINCTRL_PIN(28, "IO28"), PINCTRL_PIN(29, "IO29"),
> + PINCTRL_PIN(30, "IO30"), PINCTRL_PIN(31, "IO31"), PINCTRL_PIN(32, "IO32"),
> + PINCTRL_PIN(33, "IO33"), PINCTRL_PIN(34, "IO34"), PINCTRL_PIN(35, "IO35"),
> + PINCTRL_PIN(36, "IO36"), PINCTRL_PIN(37, "IO37"), PINCTRL_PIN(38, "IO38"),
> + PINCTRL_PIN(39, "IO39"), PINCTRL_PIN(40, "IO40"), PINCTRL_PIN(41, "IO41"),
> + PINCTRL_PIN(42, "IO42"), PINCTRL_PIN(43, "IO43"), PINCTRL_PIN(44, "IO44"),
> + PINCTRL_PIN(45, "IO45"), PINCTRL_PIN(46, "IO46"), PINCTRL_PIN(47, "IO47"),
> + PINCTRL_PIN(48, "IO48"), PINCTRL_PIN(49, "IO49"), PINCTRL_PIN(50, "IO50"),
> + PINCTRL_PIN(51, "IO51"), PINCTRL_PIN(52, "IO52"), PINCTRL_PIN(53, "IO53"),
> + PINCTRL_PIN(54, "IO54"), PINCTRL_PIN(55, "IO55"), PINCTRL_PIN(56, "IO56"),
> + PINCTRL_PIN(57, "IO57"), PINCTRL_PIN(58, "IO58"), PINCTRL_PIN(59, "IO59"),
> + PINCTRL_PIN(60, "IO60"), PINCTRL_PIN(61, "IO61"), PINCTRL_PIN(62, "IO62"),
> + PINCTRL_PIN(63, "IO63")
> +};
> +
> +static void k230_pinctrl_pin_dbg_show(struct pinctrl_dev *pctldev,
> + struct seq_file *s, unsigned int offset)
> +{
> + struct k230_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
> + u32 val, mode, bias, drive, input, output, slew, schmitt, power;
> + struct k230_pin_group *grp = k230_pins[offset].drv_data;
> + static const char * const biasing[] = {
> + "pull none", "pull down", "pull up", "" };
> + static const char * const enable[] = {
> + "disable", "enable" };
> + static const char * const power_source[] = {
> + "3V3", "1V8" };
> + int ret;
> +
> + ret = regmap_read(info->regmap_base, offset * 4, &val);
> + if (ret) {
> + dev_err(info->pctl_dev->dev,
> + "failed to read offset 0x%x\n", offset * 4);
> + return;
> + }
> +
> + mode = (val & K230_PC_SEL) >> K230_SHIFT_SEL;
> + drive = (val & K230_PC_DS) >> K230_SHIFT_DS;
> + bias = (val & K230_PC_BIAS) >> K230_SHIFT_BIAS;
> + input = (val & K230_PC_IE) >> K230_SHIFT_IE;
> + output = (val & K230_PC_OE) >> K230_SHIFT_OE;
> + slew = (val & K230_PC_SL) >> K230_SHIFT_SL;
> + schmitt = (val & K230_PC_ST) >> K230_SHIFT_ST;
> + power = (val & K230_PC_MSC) >> K230_SHIFT_MSC;
> +
> + seq_printf(s, "%s - strength %d - %s - %s - slewrate %s - schmitt %s - %s",
> + grp ? grp->name : "unknown",
> + drive,
> + biasing[bias],
> + input ? "input" : "output",
> + enable[slew],
> + enable[schmitt],
> + power_source[power]);
> +}
> +
> +static int k230_dt_node_to_map(struct pinctrl_dev *pctldev,
> + struct device_node *np_config,
> + struct pinctrl_map **map,
> + unsigned int *num_maps)
> +{
> + struct k230_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
> + struct device *dev = info->pctl_dev->dev;
> + const struct k230_pmx_func *func;
> + const struct k230_pin_group *grp;
> + struct pinctrl_map *new_map;
> + int map_num, i, j, idx;
> + unsigned int grp_id;
> +
> + func = k230_name_to_funtion(info, np_config->name);
> + if (!func) {
> + dev_err(dev, "function %s not found\n", np_config->name);
> + return -EINVAL;
> + }
> +
> + map_num = 0;
> + for (i = 0; i < func->ngroups; ++i) {
> + grp_id = func->group_idx[i];
> + /* npins of config map plus a mux map */
> + map_num += info->groups[grp_id].num_pins + 1;
> + }
> +
> + new_map = kcalloc(map_num, sizeof(*new_map), GFP_KERNEL);
> + if (!new_map)
> + return -ENOMEM;
> + *map = new_map;
> + *num_maps = map_num;
> +
> + idx = 0;
> + for (i = 0; i < func->ngroups; ++i) {
> + grp_id = func->group_idx[i];
> + grp = &info->groups[grp_id];
> + new_map[idx].type = PIN_MAP_TYPE_MUX_GROUP;
> + new_map[idx].data.mux.group = grp->name;
> + new_map[idx].data.mux.function = np_config->name;
> + idx++;
> +
> + for (j = 0; j < grp->num_pins; ++j) {
> + new_map[idx].type = PIN_MAP_TYPE_CONFIGS_PIN;
> + new_map[idx].data.configs.group_or_pin =
> + pin_get_name(pctldev, grp->pins[j]);
> + new_map[idx].data.configs.configs =
> + grp->data[j].configs;
> + new_map[idx].data.configs.num_configs =
> + grp->data[j].nconfigs;
> + idx++;
> + }
> + }
> +
> + return 0;
> +}
...
> +
> + ret = regmap_write(info->regmap_base, pin * 4, val);
> + if (ret) {
> + dev_err(dev, "failed to write offset 0x%x\n", pin * 4);
Isn't regmap an MMIO? If so, drop all of such messages. This just makes
unlikely error paths too big.
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +static int k230_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
> + unsigned long *configs, unsigned int num_configs)
> +{
> + enum pin_config_param param;
> + unsigned int arg, i;
> + int ret;
> +
> + if (WARN_ON(pin >= K230_NPINS))
Drop WARN_ON. No need to panic kernel. Instead, handle correctly the error.
> + return -EINVAL;
> +
> + for (i = 0; i < num_configs; i++) {
> + param = pinconf_to_config_param(configs[i]);
> + arg = pinconf_to_config_argument(configs[i]);
> + ret = k230_pinconf_set_param(pctldev, pin, param, arg);
> + if (ret)
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +static void k230_pconf_dbg_show(struct pinctrl_dev *pctldev,
> + struct seq_file *s, unsigned int pin)
> +{
> + struct k230_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
> + unsigned int val;
> + int ret;
> +
> + ret = regmap_read(info->regmap_base, pin * 4, &val);
> + if (ret) {
> + dev_err(info->pctl_dev->dev, "failed to read offset 0x%x\n", pin * 4);
> + return;
> + }
> +
> + seq_printf(s, " 0x%08x", val);
> +}
> +
> +static const struct pinconf_ops k230_pinconf_ops = {
> + .is_generic = true,
> + .pin_config_get = k230_pinconf_get,
> + .pin_config_set = k230_pinconf_set,
> + .pin_config_dbg_show = k230_pconf_dbg_show,
> +};
> +
> +static int k230_get_functions_count(struct pinctrl_dev *pctldev)
> +{
> + struct k230_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
> +
> + return info->nfunctions;
> +}
> +
> +static const char *k230_get_fname(struct pinctrl_dev *pctldev,
> + unsigned int selector)
> +{
> + struct k230_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
> +
> + return info->functions[selector].name;
> +}
> +
> +static int k230_get_groups(struct pinctrl_dev *pctldev, unsigned int selector,
> + const char * const **groups, unsigned int *num_groups)
> +{
> + struct k230_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
> +
> + *groups = info->functions[selector].groups;
> + *num_groups = info->functions[selector].ngroups;
> +
> + return 0;
> +}
> +
> +static int k230_set_mux(struct pinctrl_dev *pctldev, unsigned int selector,
> + unsigned int group)
> +{
> + struct k230_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
> + const struct k230_pin_conf *data = info->groups[group].data;
> + struct k230_pin_group *grp = &info->groups[group];
> + const unsigned int *pins = grp->pins;
> + struct regmap *regmap;
> + unsigned int value, mask;
> + int cnt, reg;
> +
> + regmap = info->regmap_base;
> +
> + for (cnt = 0; cnt < grp->num_pins; cnt++) {
> + reg = pins[cnt] * 4;
> + value = data[cnt].func << K230_SHIFT_SEL;
> + mask = K230_PC_SEL;
> + regmap_update_bits(regmap, reg, mask, value);
> + k230_pins[pins[cnt]].drv_data = grp;
> + }
> +
> + return 0;
> +}
> +
> +static const struct pinmux_ops k230_pmxops = {
> + .get_functions_count = k230_get_functions_count,
> + .get_function_name = k230_get_fname,
> + .get_function_groups = k230_get_groups,
> + .set_mux = k230_set_mux,
> + .strict = true,
> +};
> +
> +static int k230_pinctrl_probe(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + struct k230_pinctrl *info;
> + struct pinctrl_desc *pctl;
> +
> + info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL);
> + if (!info)
> + return -ENOMEM;
> +
> + pctl = &info->pctl;
> +
> + pctl->name = "k230-pinctrl";
> + pctl->owner = THIS_MODULE;
> + pctl->pins = k230_pins;
> + pctl->npins = ARRAY_SIZE(k230_pins);
> + pctl->pctlops = &k230_pctrl_ops;
> + pctl->pmxops = &k230_pmxops;
> + pctl->confops = &k230_pinconf_ops;
> +
> + info->base = devm_platform_ioremap_resource(pdev, 0);
> + if (IS_ERR(info->base))
> + return PTR_ERR(info->base);
> +
> + k230_regmap_config.name = "canaan,pinctrl";
Why this is not part of definition?
> + info->regmap_base = devm_regmap_init_mmio(dev, info->base,
> + &k230_regmap_config);
> + if (IS_ERR(info->regmap_base))
> + return dev_err_probe(dev, PTR_ERR(info->regmap_base),
> + "failed to init regmap\n");
> +
> + info->pctl_dev = devm_pinctrl_register(dev, pctl, info);
> + if (IS_ERR(info->pctl_dev))
> + return dev_err_probe(dev, PTR_ERR(info->pctl_dev),
> + "devm_pinctrl_register failed\n");
> +
> + k230_pinctrl_parse_dt(pdev, info);
> +
> + return 0;
> +}
> +
> +static const struct of_device_id k230_dt_ids[] = {
> + { .compatible = "canaan,k230-pinctrl", },
> + { /* sintenel */ }
> +};
> +MODULE_DEVICE_TABLE(of, k230_dt_ids);
> +
> +static struct platform_driver k230_pinctrl_driver = {
> + .probe = k230_pinctrl_probe,
> + .driver = {
> + .name = "k230-pinctrl",
> + .of_match_table = k230_dt_ids,
> + },
> +};
> +module_platform_driver(k230_pinctrl_driver);
> +
> +MODULE_LICENSE("GPL");
> +MODULE_AUTHOR("Ze Huang <18771902331@....com>");
> +MODULE_DESCRIPTION("Canaan K230 pinctrl driver");
Best regards,
Krzysztof
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