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351 lines
8.3 KiB
351 lines
8.3 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Copyright (C) 2013 John Crispin <[email protected]> |
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*/ |
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#include <linux/module.h> |
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#include <linux/device.h> |
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#include <linux/io.h> |
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#include <linux/platform_device.h> |
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#include <linux/slab.h> |
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#include <linux/of.h> |
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#include <linux/pinctrl/pinctrl.h> |
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#include <linux/pinctrl/pinconf.h> |
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#include <linux/pinctrl/pinconf-generic.h> |
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#include <linux/pinctrl/pinmux.h> |
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#include <linux/pinctrl/consumer.h> |
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#include <linux/pinctrl/machine.h> |
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#include <asm/mach-ralink/ralink_regs.h> |
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#include <asm/mach-ralink/mt7620.h> |
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#include "pinctrl-ralink.h" |
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#include "../core.h" |
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#include "../pinctrl-utils.h" |
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#define SYSC_REG_GPIO_MODE 0x60 |
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#define SYSC_REG_GPIO_MODE2 0x64 |
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struct ralink_priv { |
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struct device *dev; |
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struct pinctrl_pin_desc *pads; |
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struct pinctrl_desc *desc; |
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struct ralink_pmx_func **func; |
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int func_count; |
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struct ralink_pmx_group *groups; |
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const char **group_names; |
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int group_count; |
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u8 *gpio; |
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int max_pins; |
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}; |
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static int ralink_get_group_count(struct pinctrl_dev *pctrldev) |
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{ |
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struct ralink_priv *p = pinctrl_dev_get_drvdata(pctrldev); |
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return p->group_count; |
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} |
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static const char *ralink_get_group_name(struct pinctrl_dev *pctrldev, |
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unsigned int group) |
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{ |
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struct ralink_priv *p = pinctrl_dev_get_drvdata(pctrldev); |
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return (group >= p->group_count) ? NULL : p->group_names[group]; |
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} |
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static int ralink_get_group_pins(struct pinctrl_dev *pctrldev, |
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unsigned int group, |
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const unsigned int **pins, |
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unsigned int *num_pins) |
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{ |
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struct ralink_priv *p = pinctrl_dev_get_drvdata(pctrldev); |
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if (group >= p->group_count) |
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return -EINVAL; |
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*pins = p->groups[group].func[0].pins; |
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*num_pins = p->groups[group].func[0].pin_count; |
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return 0; |
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} |
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static const struct pinctrl_ops ralink_pctrl_ops = { |
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.get_groups_count = ralink_get_group_count, |
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.get_group_name = ralink_get_group_name, |
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.get_group_pins = ralink_get_group_pins, |
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.dt_node_to_map = pinconf_generic_dt_node_to_map_all, |
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.dt_free_map = pinconf_generic_dt_free_map, |
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}; |
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static int ralink_pmx_func_count(struct pinctrl_dev *pctrldev) |
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{ |
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struct ralink_priv *p = pinctrl_dev_get_drvdata(pctrldev); |
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return p->func_count; |
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} |
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static const char *ralink_pmx_func_name(struct pinctrl_dev *pctrldev, |
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unsigned int func) |
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{ |
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struct ralink_priv *p = pinctrl_dev_get_drvdata(pctrldev); |
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return p->func[func]->name; |
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} |
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static int ralink_pmx_group_get_groups(struct pinctrl_dev *pctrldev, |
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unsigned int func, |
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const char * const **groups, |
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unsigned int * const num_groups) |
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{ |
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struct ralink_priv *p = pinctrl_dev_get_drvdata(pctrldev); |
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if (p->func[func]->group_count == 1) |
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*groups = &p->group_names[p->func[func]->groups[0]]; |
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else |
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*groups = p->group_names; |
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*num_groups = p->func[func]->group_count; |
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return 0; |
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} |
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static int ralink_pmx_group_enable(struct pinctrl_dev *pctrldev, |
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unsigned int func, unsigned int group) |
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{ |
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struct ralink_priv *p = pinctrl_dev_get_drvdata(pctrldev); |
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u32 mode = 0; |
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u32 reg = SYSC_REG_GPIO_MODE; |
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int i; |
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int shift; |
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/* dont allow double use */ |
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if (p->groups[group].enabled) { |
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dev_err(p->dev, "%s is already enabled\n", |
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p->groups[group].name); |
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return 0; |
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} |
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p->groups[group].enabled = 1; |
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p->func[func]->enabled = 1; |
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shift = p->groups[group].shift; |
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if (shift >= 32) { |
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shift -= 32; |
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reg = SYSC_REG_GPIO_MODE2; |
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} |
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mode = rt_sysc_r32(reg); |
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mode &= ~(p->groups[group].mask << shift); |
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/* mark the pins as gpio */ |
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for (i = 0; i < p->groups[group].func[0].pin_count; i++) |
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p->gpio[p->groups[group].func[0].pins[i]] = 1; |
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/* function 0 is gpio and needs special handling */ |
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if (func == 0) { |
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mode |= p->groups[group].gpio << shift; |
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} else { |
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for (i = 0; i < p->func[func]->pin_count; i++) |
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p->gpio[p->func[func]->pins[i]] = 0; |
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mode |= p->func[func]->value << shift; |
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} |
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rt_sysc_w32(mode, reg); |
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return 0; |
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} |
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static int ralink_pmx_group_gpio_request_enable(struct pinctrl_dev *pctrldev, |
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struct pinctrl_gpio_range *range, |
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unsigned int pin) |
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{ |
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struct ralink_priv *p = pinctrl_dev_get_drvdata(pctrldev); |
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if (!p->gpio[pin]) { |
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dev_err(p->dev, "pin %d is not set to gpio mux\n", pin); |
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return -EINVAL; |
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} |
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return 0; |
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} |
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static const struct pinmux_ops ralink_pmx_group_ops = { |
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.get_functions_count = ralink_pmx_func_count, |
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.get_function_name = ralink_pmx_func_name, |
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.get_function_groups = ralink_pmx_group_get_groups, |
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.set_mux = ralink_pmx_group_enable, |
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.gpio_request_enable = ralink_pmx_group_gpio_request_enable, |
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}; |
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static struct pinctrl_desc ralink_pctrl_desc = { |
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.owner = THIS_MODULE, |
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.name = "ralink-pinctrl", |
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.pctlops = &ralink_pctrl_ops, |
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.pmxops = &ralink_pmx_group_ops, |
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}; |
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static struct ralink_pmx_func gpio_func = { |
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.name = "gpio", |
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}; |
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static int ralink_pinctrl_index(struct ralink_priv *p) |
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{ |
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struct ralink_pmx_group *mux = p->groups; |
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int i, j, c = 0; |
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/* count the mux functions */ |
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while (mux->name) { |
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p->group_count++; |
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mux++; |
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} |
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/* allocate the group names array needed by the gpio function */ |
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p->group_names = devm_kcalloc(p->dev, p->group_count, |
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sizeof(char *), GFP_KERNEL); |
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if (!p->group_names) |
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return -ENOMEM; |
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for (i = 0; i < p->group_count; i++) { |
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p->group_names[i] = p->groups[i].name; |
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p->func_count += p->groups[i].func_count; |
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} |
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/* we have a dummy function[0] for gpio */ |
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p->func_count++; |
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/* allocate our function and group mapping index buffers */ |
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p->func = devm_kcalloc(p->dev, p->func_count, |
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sizeof(*p->func), GFP_KERNEL); |
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gpio_func.groups = devm_kcalloc(p->dev, p->group_count, sizeof(int), |
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GFP_KERNEL); |
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if (!p->func || !gpio_func.groups) |
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return -ENOMEM; |
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/* add a backpointer to the function so it knows its group */ |
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gpio_func.group_count = p->group_count; |
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for (i = 0; i < gpio_func.group_count; i++) |
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gpio_func.groups[i] = i; |
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p->func[c] = &gpio_func; |
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c++; |
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/* add remaining functions */ |
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for (i = 0; i < p->group_count; i++) { |
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for (j = 0; j < p->groups[i].func_count; j++) { |
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p->func[c] = &p->groups[i].func[j]; |
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p->func[c]->groups = devm_kzalloc(p->dev, sizeof(int), |
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GFP_KERNEL); |
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if (!p->func[c]->groups) |
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return -ENOMEM; |
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p->func[c]->groups[0] = i; |
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p->func[c]->group_count = 1; |
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c++; |
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} |
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} |
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return 0; |
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} |
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static int ralink_pinctrl_pins(struct ralink_priv *p) |
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{ |
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int i, j; |
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/* |
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* loop over the functions and initialize the pins array. |
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* also work out the highest pin used. |
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*/ |
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for (i = 0; i < p->func_count; i++) { |
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int pin; |
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if (!p->func[i]->pin_count) |
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continue; |
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p->func[i]->pins = devm_kcalloc(p->dev, |
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p->func[i]->pin_count, |
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sizeof(int), |
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GFP_KERNEL); |
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if (!p->func[i]->pins) |
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return -ENOMEM; |
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for (j = 0; j < p->func[i]->pin_count; j++) |
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p->func[i]->pins[j] = p->func[i]->pin_first + j; |
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pin = p->func[i]->pin_first + p->func[i]->pin_count; |
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if (pin > p->max_pins) |
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p->max_pins = pin; |
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} |
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/* the buffer that tells us which pins are gpio */ |
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p->gpio = devm_kcalloc(p->dev, p->max_pins, sizeof(u8), GFP_KERNEL); |
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/* the pads needed to tell pinctrl about our pins */ |
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p->pads = devm_kcalloc(p->dev, p->max_pins, |
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sizeof(struct pinctrl_pin_desc), GFP_KERNEL); |
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if (!p->pads || !p->gpio) |
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return -ENOMEM; |
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memset(p->gpio, 1, sizeof(u8) * p->max_pins); |
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for (i = 0; i < p->func_count; i++) { |
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if (!p->func[i]->pin_count) |
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continue; |
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for (j = 0; j < p->func[i]->pin_count; j++) |
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p->gpio[p->func[i]->pins[j]] = 0; |
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} |
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/* pin 0 is always a gpio */ |
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p->gpio[0] = 1; |
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/* set the pads */ |
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for (i = 0; i < p->max_pins; i++) { |
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/* strlen("ioXY") + 1 = 5 */ |
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char *name = devm_kzalloc(p->dev, 5, GFP_KERNEL); |
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if (!name) |
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return -ENOMEM; |
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snprintf(name, 5, "io%d", i); |
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p->pads[i].number = i; |
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p->pads[i].name = name; |
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} |
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p->desc->pins = p->pads; |
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p->desc->npins = p->max_pins; |
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return 0; |
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} |
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int ralink_pinctrl_init(struct platform_device *pdev, |
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struct ralink_pmx_group *data) |
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{ |
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struct ralink_priv *p; |
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struct pinctrl_dev *dev; |
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int err; |
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if (!data) |
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return -ENOTSUPP; |
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/* setup the private data */ |
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p = devm_kzalloc(&pdev->dev, sizeof(struct ralink_priv), GFP_KERNEL); |
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if (!p) |
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return -ENOMEM; |
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p->dev = &pdev->dev; |
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p->desc = &ralink_pctrl_desc; |
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p->groups = data; |
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platform_set_drvdata(pdev, p); |
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/* init the device */ |
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err = ralink_pinctrl_index(p); |
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if (err) { |
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dev_err(&pdev->dev, "failed to load index\n"); |
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return err; |
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} |
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err = ralink_pinctrl_pins(p); |
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if (err) { |
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dev_err(&pdev->dev, "failed to load pins\n"); |
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return err; |
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} |
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dev = pinctrl_register(p->desc, &pdev->dev, p); |
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return PTR_ERR_OR_ZERO(dev); |
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}
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