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![Philippe Reynes](/assets/img/avatar_default.png)
Add pinctrl support for broadcom bcm6838 SoC. Signed-off-by: Philippe Reynes <philippe.reynes@softathome.com>
162 lines
4.1 KiB
C
162 lines
4.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <common.h>
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#include <dm.h>
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#include <regmap.h>
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#include <syscon.h>
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#include <dm/pinctrl.h>
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#define BCM6838_CMD_LOAD_MUX 0x21
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#define BCM6838_FUNC_OFFS 12
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#define BCM6838_FUNC_MASK (0x37 << BCM6838_FUNC_OFFS)
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#define BCM6838_PIN_OFFS 0
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#define BCM6838_PIN_MASK (0xfff << BCM6838_PIN_OFFS)
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#define BCM6838_MAX_PIN_NAME_LEN 8
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static char bcm6838_pin_name[BCM6838_MAX_PIN_NAME_LEN];
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#define BCM6838_MAX_FUNC_NAME_LEN 8
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static char bcm6838_func_name[BCM6838_MAX_FUNC_NAME_LEN];
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struct bcm6838_test_port_hw {
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unsigned long port_blk_data1;
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unsigned long port_blk_data2;
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unsigned long port_command;
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};
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static const struct bcm6838_test_port_hw bcm6838_hw = {
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.port_blk_data1 = 0x10,
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.port_blk_data2 = 0x14,
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.port_command = 0x18
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};
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struct bcm6838_pinctrl_priv {
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const struct bcm6838_test_port_hw *hw;
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struct regmap *regmap;
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u32 pins_count;
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u32 functions_count;
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};
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int bcm6838_pinctrl_get_pins_count(struct udevice *dev)
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{
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struct bcm6838_pinctrl_priv *priv = dev_get_priv(dev);
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return priv->pins_count;
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}
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const char *bcm6838_pinctrl_get_pin_name(struct udevice *dev,
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unsigned int selector)
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{
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snprintf(bcm6838_pin_name, BCM6838_MAX_PIN_NAME_LEN, "%u", selector);
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return bcm6838_pin_name;
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}
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int bcm6838_pinctrl_get_functions_count(struct udevice *dev)
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{
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struct bcm6838_pinctrl_priv *priv = dev_get_priv(dev);
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return priv->functions_count;
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}
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const char *bcm6838_pinctrl_get_function_name(struct udevice *dev,
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unsigned int selector)
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{
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snprintf(bcm6838_func_name, BCM6838_MAX_FUNC_NAME_LEN, "%u", selector);
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return bcm6838_func_name;
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}
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int bcm6838_pinctrl_pinmux_set(struct udevice *dev,
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unsigned int pin_selector,
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unsigned int func_selector)
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{
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struct bcm6838_pinctrl_priv *priv = dev_get_priv(dev);
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const struct bcm6838_test_port_hw *hw = priv->hw;
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unsigned int data;
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regmap_write(priv->regmap, hw->port_blk_data1, 0);
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data = (func_selector << BCM6838_FUNC_OFFS) & BCM6838_FUNC_MASK;
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data |= (pin_selector << BCM6838_PIN_OFFS) & BCM6838_PIN_MASK;
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regmap_write(priv->regmap, hw->port_blk_data2, data);
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regmap_write(priv->regmap, hw->port_command, BCM6838_CMD_LOAD_MUX);
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return 0;
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}
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int bcm6838_pinctrl_probe(struct udevice *dev)
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{
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struct bcm6838_pinctrl_priv *priv = dev_get_priv(dev);
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const struct bcm6838_test_port_hw *hw =
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(const struct bcm6838_test_port_hw *)dev_get_driver_data(dev);
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int err;
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u32 phandle;
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ofnode node;
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err = ofnode_read_u32(dev_ofnode(dev), "regmap", &phandle);
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if (err) {
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dev_err(dev, "%s: unable to read regmap\n", __func__);
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goto out;
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}
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node = ofnode_get_by_phandle(phandle);
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if (!ofnode_valid(node)) {
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dev_err(dev, "%s: unable to find node\n", __func__);
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err = -EINVAL;
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goto out;
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}
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priv->regmap = syscon_node_to_regmap(node);
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if (!priv->regmap) {
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dev_err(dev, "%s: unable to find regmap\n", __func__);
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err = -ENODEV;
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goto out;
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}
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err = ofnode_read_u32(dev_ofnode(dev), "brcm,pins-count",
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&priv->pins_count);
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if (err) {
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dev_err(dev, "%s: unable to read brcm,pins-count\n",
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__func__);
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goto out;
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}
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err = ofnode_read_u32(dev_ofnode(dev), "brcm,functions-count",
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&priv->functions_count);
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if (err) {
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dev_err(dev, "%s: unable to read brcm,functions-count\n",
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__func__);
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goto out;
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}
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priv->hw = hw;
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out:
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return err;
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}
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const struct pinctrl_ops bcm6838_pinctrl_ops = {
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.set_state = pinctrl_generic_set_state,
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.get_pins_count = bcm6838_pinctrl_get_pins_count,
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.get_pin_name = bcm6838_pinctrl_get_pin_name,
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.get_functions_count = bcm6838_pinctrl_get_functions_count,
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.get_function_name = bcm6838_pinctrl_get_function_name,
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.pinmux_set = bcm6838_pinctrl_pinmux_set,
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};
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static const struct udevice_id bcm6838_pinctrl_match[] = {
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{
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.compatible = "brcm,bcm6838-pinctrl",
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.data = (ulong)&bcm6838_hw,
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},
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{ /* sentinel */ }
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};
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U_BOOT_DRIVER(bcm6838_pinctrl) = {
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.name = "bcm6838_pinctrl",
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.id = UCLASS_PINCTRL,
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.of_match = bcm6838_pinctrl_match,
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.ops = &bcm6838_pinctrl_ops,
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.priv_auto_alloc_size = sizeof(struct bcm6838_pinctrl_priv),
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.probe = bcm6838_pinctrl_probe,
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};
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