pinctrl: berlin: add the core pinctrl driver for Marvell Berlin SoCs
The Marvell Berlin boards have a group based pinmuxing mechanism. This adds the core driver support. We actually do not need any information about the pins here and only have the definition of the groups. Let's take the example of the uart0 pinmuxing on the BG2Q. Balls BK4 and BH6 are muxed to respectively UART0 RX and TX if the group GSM12 is set to mode 0: Group Modes Offset Base Offset LSB Bit Width GSM12 3 sm_base 0x40 0x10 0x2 Ball Group Mode 0 Mode 1 Mode 2 BK4 GSM12 UART0_RX IrDA0_RX GPIO9 BH6 GSM12 UART0_TX IrDA0_TX GPIO10 So in order to configure BK4 -> UART0_TX and BH6 -> UART0_RX, we need to set (sm_base + 0x40 + 0x10) &= ff3fffff. As pin control registers are part of either chip control or system control registers, that deal with a bunch of other functions we rely on a regmap instead of exclusively remapping any resources. Signed-off-by: Antoine Tenart <antoine.tenart@free-electrons.com> Acked-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>hifive-unleashed-5.1
Antoine Tenart
Linus Walleij
parent
3ff95885ed
commit
3de68d331c
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@ -385,6 +385,7 @@ config PINCTRL_S3C64XX
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depends on ARCH_S3C64XX
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select PINCTRL_SAMSUNG
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source "drivers/pinctrl/berlin/Kconfig"
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source "drivers/pinctrl/mvebu/Kconfig"
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source "drivers/pinctrl/sh-pfc/Kconfig"
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source "drivers/pinctrl/spear/Kconfig"
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@ -69,6 +69,7 @@ obj-$(CONFIG_PINCTRL_TB10X) += pinctrl-tb10x.o
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obj-$(CONFIG_PINCTRL_ST) += pinctrl-st.o
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obj-$(CONFIG_PINCTRL_VF610) += pinctrl-vf610.o
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obj-$(CONFIG_ARCH_BERLIN) += berlin/
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obj-$(CONFIG_PLAT_ORION) += mvebu/
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obj-$(CONFIG_ARCH_SHMOBILE) += sh-pfc/
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obj-$(CONFIG_SUPERH) += sh-pfc/
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@ -0,0 +1,8 @@
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if ARCH_BERLIN
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config PINCTRL_BERLIN
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bool
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select PINMUX
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select REGMAP_MMIO
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endif
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@ -0,0 +1 @@
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obj-$(CONFIG_PINCTRL_BERLIN) += berlin.o
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@ -0,0 +1,348 @@
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/*
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* Marvell Berlin SoC pinctrl core driver
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*
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* Copyright (C) 2014 Marvell Technology Group Ltd.
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*
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* Antoine Ténart <antoine.tenart@free-electrons.com>
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*
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* This file is licensed under the terms of the GNU General Public
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* License version 2. This program is licensed "as is" without any
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* warranty of any kind, whether express or implied.
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*/
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/of_device.h>
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#include <linux/pinctrl/pinctrl.h>
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#include <linux/pinctrl/pinmux.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#include <linux/slab.h>
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#include "../core.h"
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#include "../pinctrl-utils.h"
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#include "berlin.h"
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struct berlin_pinctrl {
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struct regmap *regmap;
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struct device *dev;
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const struct berlin_pinctrl_desc *desc;
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struct berlin_pinctrl_function *functions;
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unsigned nfunctions;
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struct pinctrl_dev *pctrl_dev;
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};
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static int berlin_pinctrl_get_group_count(struct pinctrl_dev *pctrl_dev)
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{
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struct berlin_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrl_dev);
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return pctrl->desc->ngroups;
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}
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static const char *berlin_pinctrl_get_group_name(struct pinctrl_dev *pctrl_dev,
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unsigned group)
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{
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struct berlin_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrl_dev);
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return pctrl->desc->groups[group].name;
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}
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static int berlin_pinctrl_dt_node_to_map(struct pinctrl_dev *pctrl_dev,
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struct device_node *node,
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struct pinctrl_map **map,
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unsigned *num_maps)
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{
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struct berlin_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrl_dev);
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struct property *prop;
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const char *function_name, *group_name;
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unsigned reserved_maps = 0;
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int ret, ngroups;
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*map = NULL;
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*num_maps = 0;
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ret = of_property_read_string(node, "function", &function_name);
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if (ret) {
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dev_err(pctrl->dev,
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"missing function property in node %s\n",
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node->name);
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return -EINVAL;
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}
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ngroups = of_property_count_strings(node, "groups");
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if (ngroups < 0) {
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dev_err(pctrl->dev,
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"missing groups property in node %s\n",
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node->name);
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return -EINVAL;
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}
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ret = pinctrl_utils_reserve_map(pctrl_dev, map, &reserved_maps,
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num_maps, ngroups);
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if (ret) {
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dev_err(pctrl->dev, "can't reserve map: %d\n", ret);
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return ret;
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}
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of_property_for_each_string(node, "groups", prop, group_name) {
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ret = pinctrl_utils_add_map_mux(pctrl_dev, map, &reserved_maps,
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num_maps, group_name,
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function_name);
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if (ret) {
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dev_err(pctrl->dev, "can't add map: %d\n", ret);
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return ret;
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}
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}
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return 0;
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}
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static void berlin_pinctrl_dt_free_map(struct pinctrl_dev *pctrl_dev,
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struct pinctrl_map *map,
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unsigned nmaps)
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{
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int i;
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for (i = 0; i < nmaps; i++) {
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if (map[i].type == PIN_MAP_TYPE_MUX_GROUP) {
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kfree(map[i].data.mux.group);
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/* a function can be applied to multiple groups */
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if (i == 0)
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kfree(map[i].data.mux.function);
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}
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}
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kfree(map);
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}
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static const struct pinctrl_ops berlin_pinctrl_ops = {
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.get_groups_count = &berlin_pinctrl_get_group_count,
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.get_group_name = &berlin_pinctrl_get_group_name,
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.dt_node_to_map = &berlin_pinctrl_dt_node_to_map,
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.dt_free_map = &berlin_pinctrl_dt_free_map,
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};
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static int berlin_pinmux_get_functions_count(struct pinctrl_dev *pctrl_dev)
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{
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struct berlin_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrl_dev);
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return pctrl->nfunctions;
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}
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static const char *berlin_pinmux_get_function_name(struct pinctrl_dev *pctrl_dev,
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unsigned function)
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{
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struct berlin_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrl_dev);
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return pctrl->functions[function].name;
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}
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static int berlin_pinmux_get_function_groups(struct pinctrl_dev *pctrl_dev,
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unsigned function,
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const char * const **groups,
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unsigned * const num_groups)
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{
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struct berlin_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrl_dev);
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*groups = pctrl->functions[function].groups;
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*num_groups = pctrl->functions[function].ngroups;
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return 0;
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}
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static struct berlin_desc_function *
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berlin_pinctrl_find_function_by_name(struct berlin_pinctrl *pctrl,
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const struct berlin_desc_group *group,
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const char *fname)
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{
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struct berlin_desc_function *function = group->functions;
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while (function->name) {
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if (!strcmp(function->name, fname))
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return function;
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function++;
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}
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return NULL;
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}
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static int berlin_pinmux_enable(struct pinctrl_dev *pctrl_dev,
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unsigned function,
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unsigned group)
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{
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struct berlin_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrl_dev);
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const struct berlin_desc_group *group_desc = pctrl->desc->groups + group;
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struct berlin_pinctrl_function *func = pctrl->functions + function;
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struct berlin_desc_function *function_desc =
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berlin_pinctrl_find_function_by_name(pctrl, group_desc,
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func->name);
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u32 mask, val;
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if (!function_desc)
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return -EINVAL;
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mask = GENMASK(group_desc->lsb + group_desc->bit_width - 1,
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group_desc->lsb);
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val = function_desc->muxval << group_desc->lsb;
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regmap_update_bits(pctrl->regmap, group_desc->offset, mask, val);
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return 0;
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}
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static const struct pinmux_ops berlin_pinmux_ops = {
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.get_functions_count = &berlin_pinmux_get_functions_count,
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.get_function_name = &berlin_pinmux_get_function_name,
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.get_function_groups = &berlin_pinmux_get_function_groups,
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.enable = &berlin_pinmux_enable,
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};
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static int berlin_pinctrl_add_function(struct berlin_pinctrl *pctrl,
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const char *name)
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{
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struct berlin_pinctrl_function *function = pctrl->functions;
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while (function->name) {
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if (!strcmp(function->name, name)) {
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function->ngroups++;
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return -EEXIST;
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}
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function++;
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}
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function->name = name;
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function->ngroups = 1;
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pctrl->nfunctions++;
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return 0;
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}
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static int berlin_pinctrl_build_state(struct platform_device *pdev)
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{
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struct berlin_pinctrl *pctrl = platform_get_drvdata(pdev);
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struct berlin_desc_group const *desc_group;
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struct berlin_desc_function const *desc_function;
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int i, max_functions = 0;
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pctrl->nfunctions = 0;
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for (i = 0; i < pctrl->desc->ngroups; i++) {
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desc_group = pctrl->desc->groups + i;
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/* compute the maxiumum number of functions a group can have */
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max_functions += 1 << (desc_group->bit_width + 1);
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}
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/* we will reallocate later */
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pctrl->functions = devm_kzalloc(&pdev->dev,
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max_functions * sizeof(*pctrl->functions),
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GFP_KERNEL);
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if (!pctrl->functions)
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return -ENOMEM;
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/* register all functions */
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for (i = 0; i < pctrl->desc->ngroups; i++) {
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desc_group = pctrl->desc->groups + i;
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desc_function = desc_group->functions;
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while (desc_function->name) {
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berlin_pinctrl_add_function(pctrl, desc_function->name);
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desc_function++;
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}
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}
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pctrl->functions = krealloc(pctrl->functions,
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pctrl->nfunctions * sizeof(*pctrl->functions),
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GFP_KERNEL);
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/* map functions to theirs groups */
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for (i = 0; i < pctrl->desc->ngroups; i++) {
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desc_group = pctrl->desc->groups + i;
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desc_function = desc_group->functions;
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while (desc_function->name) {
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struct berlin_pinctrl_function
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*function = pctrl->functions;
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const char **groups;
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bool found = false;
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while (function->name) {
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if (!strcmp(desc_function->name, function->name)) {
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found = true;
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break;
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}
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function++;
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}
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if (!found)
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return -EINVAL;
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if (!function->groups) {
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function->groups =
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devm_kzalloc(&pdev->dev,
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function->ngroups * sizeof(char *),
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GFP_KERNEL);
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if (!function->groups)
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return -ENOMEM;
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}
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groups = function->groups;
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while (*groups)
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groups++;
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*groups = desc_group->name;
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desc_function++;
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}
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}
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return 0;
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}
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static struct pinctrl_desc berlin_pctrl_desc = {
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.name = "berlin-pinctrl",
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.pctlops = &berlin_pinctrl_ops,
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.pmxops = &berlin_pinmux_ops,
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.owner = THIS_MODULE,
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};
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int berlin_pinctrl_probe(struct platform_device *pdev,
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const struct berlin_pinctrl_desc *desc)
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{
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struct device *dev = &pdev->dev;
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struct berlin_pinctrl *pctrl;
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struct regmap *regmap;
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int ret;
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regmap = dev_get_regmap(&pdev->dev, NULL);
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if (!regmap)
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return PTR_ERR(regmap);
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pctrl = devm_kzalloc(dev, sizeof(*pctrl), GFP_KERNEL);
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if (!pctrl)
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return -ENOMEM;
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platform_set_drvdata(pdev, pctrl);
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pctrl->regmap = regmap;
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pctrl->dev = &pdev->dev;
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pctrl->desc = desc;
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ret = berlin_pinctrl_build_state(pdev);
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if (ret) {
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dev_err(dev, "cannot build driver state: %d\n", ret);
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return ret;
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}
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pctrl->pctrl_dev = pinctrl_register(&berlin_pctrl_desc, dev, pctrl);
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if (!pctrl->pctrl_dev) {
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dev_err(dev, "failed to register pinctrl driver\n");
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return -EINVAL;
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}
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return 0;
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}
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@ -0,0 +1,61 @@
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/*
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* Marvell Berlin SoC pinctrl driver.
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*
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* Copyright (C) 2014 Marvell Technology Group Ltd.
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*
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* Antoine Ténart <antoine.tenart@free-electrons.com>
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*
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* This file is licensed under the terms of the GNU General Public
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* License version 2. This program is licensed "as is" without any
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* warranty of any kind, whether express or implied.
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*/
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#ifndef __PINCTRL_BERLIN_H
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#define __PINCTRL_BERLIN_H
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struct berlin_desc_function {
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const char *name;
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u8 muxval;
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};
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struct berlin_desc_group {
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const char *name;
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u8 offset;
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u8 bit_width;
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u8 lsb;
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struct berlin_desc_function *functions;
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};
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struct berlin_pinctrl_desc {
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const struct berlin_desc_group *groups;
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unsigned ngroups;
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};
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struct berlin_pinctrl_function {
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const char *name;
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const char **groups;
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unsigned ngroups;
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};
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#define BERLIN_PINCTRL_GROUP(_name, _offset, _width, _lsb, ...) \
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{ \
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.name = _name, \
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.offset = _offset, \
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.bit_width = _width, \
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.lsb = _lsb, \
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.functions = (struct berlin_desc_function[]){ \
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__VA_ARGS__, { } }, \
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}
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#define BERLIN_PINCTRL_FUNCTION(_muxval, _name) \
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{ \
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.name = _name, \
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.muxval = _muxval, \
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}
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#define BERLIN_PINCTRL_FUNCTION_UNKNOWN {}
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int berlin_pinctrl_probe(struct platform_device *pdev,
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const struct berlin_pinctrl_desc *desc);
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#endif /* __PINCTRL_BERLIN_H */
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