pinctrl-da850-pupd.c 4.8 KB

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  1. // SPDX-License-Identifier: GPL-2.0-only
  2. /*
  3. * Pinconf driver for TI DA850/OMAP-L138/AM18XX pullup/pulldown groups
  4. *
  5. * Copyright (C) 2016 David Lechner
  6. */
  7. #include <linux/bitops.h>
  8. #include <linux/device.h>
  9. #include <linux/io.h>
  10. #include <linux/ioport.h>
  11. #include <linux/mod_devicetable.h>
  12. #include <linux/module.h>
  13. #include <linux/pinctrl/pinconf.h>
  14. #include <linux/pinctrl/pinconf-generic.h>
  15. #include <linux/pinctrl/pinctrl.h>
  16. #include <linux/platform_device.h>
  17. #define DA850_PUPD_ENA 0x00
  18. #define DA850_PUPD_SEL 0x04
  19. struct da850_pupd_data {
  20. void __iomem *base;
  21. struct pinctrl_desc desc;
  22. struct pinctrl_dev *pinctrl;
  23. };
  24. static const char * const da850_pupd_group_names[] = {
  25. "cp0", "cp1", "cp2", "cp3", "cp4", "cp5", "cp6", "cp7",
  26. "cp8", "cp9", "cp10", "cp11", "cp12", "cp13", "cp14", "cp15",
  27. "cp16", "cp17", "cp18", "cp19", "cp20", "cp21", "cp22", "cp23",
  28. "cp24", "cp25", "cp26", "cp27", "cp28", "cp29", "cp30", "cp31",
  29. };
  30. static int da850_pupd_get_groups_count(struct pinctrl_dev *pctldev)
  31. {
  32. return ARRAY_SIZE(da850_pupd_group_names);
  33. }
  34. static const char *da850_pupd_get_group_name(struct pinctrl_dev *pctldev,
  35. unsigned int selector)
  36. {
  37. return da850_pupd_group_names[selector];
  38. }
  39. static int da850_pupd_get_group_pins(struct pinctrl_dev *pctldev,
  40. unsigned int selector,
  41. const unsigned int **pins,
  42. unsigned int *num_pins)
  43. {
  44. *num_pins = 0;
  45. return 0;
  46. }
  47. static const struct pinctrl_ops da850_pupd_pctlops = {
  48. .get_groups_count = da850_pupd_get_groups_count,
  49. .get_group_name = da850_pupd_get_group_name,
  50. .get_group_pins = da850_pupd_get_group_pins,
  51. .dt_node_to_map = pinconf_generic_dt_node_to_map_group,
  52. .dt_free_map = pinconf_generic_dt_free_map,
  53. };
  54. static int da850_pupd_pin_config_group_get(struct pinctrl_dev *pctldev,
  55. unsigned int selector,
  56. unsigned long *config)
  57. {
  58. struct da850_pupd_data *data = pinctrl_dev_get_drvdata(pctldev);
  59. enum pin_config_param param = pinconf_to_config_param(*config);
  60. u32 val;
  61. u16 arg;
  62. val = readl(data->base + DA850_PUPD_ENA);
  63. arg = !!(~val & BIT(selector));
  64. switch (param) {
  65. case PIN_CONFIG_BIAS_DISABLE:
  66. break;
  67. case PIN_CONFIG_BIAS_PULL_UP:
  68. case PIN_CONFIG_BIAS_PULL_DOWN:
  69. if (arg) {
  70. /* bias is disabled */
  71. arg = 0;
  72. break;
  73. }
  74. val = readl(data->base + DA850_PUPD_SEL);
  75. if (param == PIN_CONFIG_BIAS_PULL_DOWN)
  76. val = ~val;
  77. arg = !!(val & BIT(selector));
  78. break;
  79. default:
  80. return -EINVAL;
  81. }
  82. *config = pinconf_to_config_packed(param, arg);
  83. return 0;
  84. }
  85. static int da850_pupd_pin_config_group_set(struct pinctrl_dev *pctldev,
  86. unsigned int selector,
  87. unsigned long *configs,
  88. unsigned int num_configs)
  89. {
  90. struct da850_pupd_data *data = pinctrl_dev_get_drvdata(pctldev);
  91. u32 ena, sel;
  92. enum pin_config_param param;
  93. int i;
  94. ena = readl(data->base + DA850_PUPD_ENA);
  95. sel = readl(data->base + DA850_PUPD_SEL);
  96. for (i = 0; i < num_configs; i++) {
  97. param = pinconf_to_config_param(configs[i]);
  98. switch (param) {
  99. case PIN_CONFIG_BIAS_DISABLE:
  100. ena &= ~BIT(selector);
  101. break;
  102. case PIN_CONFIG_BIAS_PULL_UP:
  103. ena |= BIT(selector);
  104. sel |= BIT(selector);
  105. break;
  106. case PIN_CONFIG_BIAS_PULL_DOWN:
  107. ena |= BIT(selector);
  108. sel &= ~BIT(selector);
  109. break;
  110. default:
  111. return -EINVAL;
  112. }
  113. }
  114. writel(sel, data->base + DA850_PUPD_SEL);
  115. writel(ena, data->base + DA850_PUPD_ENA);
  116. return 0;
  117. }
  118. static const struct pinconf_ops da850_pupd_confops = {
  119. .is_generic = true,
  120. .pin_config_group_get = da850_pupd_pin_config_group_get,
  121. .pin_config_group_set = da850_pupd_pin_config_group_set,
  122. };
  123. static int da850_pupd_probe(struct platform_device *pdev)
  124. {
  125. struct device *dev = &pdev->dev;
  126. struct da850_pupd_data *data;
  127. data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
  128. if (!data)
  129. return -ENOMEM;
  130. data->base = devm_platform_ioremap_resource(pdev, 0);
  131. if (IS_ERR(data->base)) {
  132. dev_err(dev, "Could not map resource\n");
  133. return PTR_ERR(data->base);
  134. }
  135. data->desc.name = dev_name(dev);
  136. data->desc.pctlops = &da850_pupd_pctlops;
  137. data->desc.confops = &da850_pupd_confops;
  138. data->desc.owner = THIS_MODULE;
  139. data->pinctrl = devm_pinctrl_register(dev, &data->desc, data);
  140. if (IS_ERR(data->pinctrl)) {
  141. dev_err(dev, "Failed to register pinctrl\n");
  142. return PTR_ERR(data->pinctrl);
  143. }
  144. platform_set_drvdata(pdev, data);
  145. return 0;
  146. }
  147. static int da850_pupd_remove(struct platform_device *pdev)
  148. {
  149. return 0;
  150. }
  151. static const struct of_device_id da850_pupd_of_match[] = {
  152. { .compatible = "ti,da850-pupd" },
  153. { }
  154. };
  155. MODULE_DEVICE_TABLE(of, da850_pupd_of_match);
  156. static struct platform_driver da850_pupd_driver = {
  157. .driver = {
  158. .name = "ti-da850-pupd",
  159. .of_match_table = da850_pupd_of_match,
  160. },
  161. .probe = da850_pupd_probe,
  162. .remove = da850_pupd_remove,
  163. };
  164. module_platform_driver(da850_pupd_driver);
  165. MODULE_AUTHOR("David Lechner <david@lechnology.com>");
  166. MODULE_DESCRIPTION("TI DA850/OMAP-L138/AM18XX pullup/pulldown configuration");
  167. MODULE_LICENSE("GPL");