diff options
Diffstat (limited to 'drivers/pinctrl/nxp/pinctrl-imx.c')
| -rw-r--r-- | drivers/pinctrl/nxp/pinctrl-imx.c | 241 |
1 files changed, 241 insertions, 0 deletions
diff --git a/drivers/pinctrl/nxp/pinctrl-imx.c b/drivers/pinctrl/nxp/pinctrl-imx.c new file mode 100644 index 0000000000..40b0616c0b --- /dev/null +++ b/drivers/pinctrl/nxp/pinctrl-imx.c @@ -0,0 +1,241 @@ +/* + * Copyright (C) 2016 Peng Fan <van.freenix@gmail.com> + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <mapmem.h> +#include <linux/io.h> +#include <linux/err.h> +#include <dm/device.h> +#include <dm/pinctrl.h> + +#include "pinctrl-imx.h" + +DECLARE_GLOBAL_DATA_PTR; + +static int imx_pinctrl_set_state(struct udevice *dev, struct udevice *config) +{ + struct imx_pinctrl_priv *priv = dev_get_priv(dev); + struct imx_pinctrl_soc_info *info = priv->info; + int node = config->of_offset; + const struct fdt_property *prop; + u32 *pin_data; + int npins, size, pin_size; + int mux_reg, conf_reg, input_reg, input_val, mux_mode, config_val; + int i, j = 0; + + dev_dbg(dev, "%s: %s\n", __func__, config->name); + + if (info->flags & SHARE_MUX_CONF_REG) + pin_size = SHARE_FSL_PIN_SIZE; + else + pin_size = FSL_PIN_SIZE; + + prop = fdt_getprop(gd->fdt_blob, node, "fsl,pins", &size); + if (!prop) { + dev_err(dev, "No fsl,pins property in node %s\n", config->name); + return -EINVAL; + } + + if (!size || size % pin_size) { + dev_err(dev, "Invalid fsl,pins property in node %s\n", + config->name); + return -EINVAL; + } + + pin_data = devm_kzalloc(dev, size, 0); + if (!pin_data) + return -ENOMEM; + + if (fdtdec_get_int_array(gd->fdt_blob, node, "fsl,pins", + pin_data, size >> 2)) { + dev_err(dev, "Error reading pin data.\n"); + return -EINVAL; + } + + npins = size / pin_size; + + /* + * Refer to linux documentation for details: + * Documentation/devicetree/bindings/pinctrl/fsl,imx-pinctrl.txt + */ + for (i = 0; i < npins; i++) { + mux_reg = pin_data[j++]; + + if (!(info->flags & ZERO_OFFSET_VALID) && !mux_reg) + mux_reg = -1; + + if (info->flags & SHARE_MUX_CONF_REG) { + conf_reg = mux_reg; + } else { + conf_reg = pin_data[j++]; + if (!(info->flags & ZERO_OFFSET_VALID) && !conf_reg) + conf_reg = -1; + } + + if ((mux_reg == -1) || (conf_reg == -1)) { + dev_err(dev, "Error mux_reg or conf_reg\n"); + return -EINVAL; + } + + input_reg = pin_data[j++]; + mux_mode = pin_data[j++]; + input_val = pin_data[j++]; + config_val = pin_data[j++]; + + dev_dbg(dev, "mux_reg 0x%x, conf_reg 0x%x, input_reg 0x%x, " + "mux_mode 0x%x, input_val 0x%x, config_val 0x%x\n", + mux_reg, conf_reg, input_reg, mux_mode, input_val, + config_val); + + if (config_val & IMX_PAD_SION) + mux_mode |= IOMUXC_CONFIG_SION; + + config_val &= ~IMX_PAD_SION; + + /* Set Mux */ + if (info->flags & SHARE_MUX_CONF_REG) { + clrsetbits_le32(info->base + mux_reg, 0x7 << 20, + mux_mode << 20); + } else { + writel(mux_mode, info->base + mux_reg); + } + + dev_dbg(dev, "write mux: offset 0x%x val 0x%x\n", mux_reg, + mux_mode); + + /* + * Set select input + * + * If the select input value begins with 0xff, it's a quirky + * select input and the value should be interpreted as below. + * 31 23 15 7 0 + * | 0xff | shift | width | select | + * It's used to work around the problem that the select + * input for some pin is not implemented in the select + * input register but in some general purpose register. + * We encode the select input value, width and shift of + * the bit field into input_val cell of pin function ID + * in device tree, and then decode them here for setting + * up the select input bits in general purpose register. + */ + + if (input_val >> 24 == 0xff) { + u32 val = input_val; + u8 select = val & 0xff; + u8 width = (val >> 8) & 0xff; + u8 shift = (val >> 16) & 0xff; + u32 mask = ((1 << width) - 1) << shift; + /* + * The input_reg[i] here is actually some IOMUXC general + * purpose register, not regular select input register. + */ + val = readl(info->base + input_reg); + val &= ~mask; + val |= select << shift; + writel(val, info->base + input_reg); + } else if (input_reg) { + /* + * Regular select input register can never be at offset + * 0, and we only print register value for regular case. + */ + if (info->input_sel_base) + writel(input_val, info->input_sel_base + + input_reg); + else + writel(input_val, info->base + input_reg); + + dev_dbg(dev, "select_input: offset 0x%x val 0x%x\n", + input_reg, input_val); + } + + /* Set config */ + if (!(config_val & IMX_NO_PAD_CTL)) { + if (info->flags & SHARE_MUX_CONF_REG) { + clrsetbits_le32(info->base + conf_reg, 0xffff, + config_val); + } else { + writel(config_val, info->base + conf_reg); + } + + dev_dbg(dev, "write config: offset 0x%x val 0x%x\n", + conf_reg, config_val); + } + } + + return 0; +} + +const struct pinctrl_ops imx_pinctrl_ops = { + .set_state = imx_pinctrl_set_state, +}; + +int imx_pinctrl_probe(struct udevice *dev, + struct imx_pinctrl_soc_info *info) +{ + struct imx_pinctrl_priv *priv = dev_get_priv(dev); + int node = dev->of_offset, ret; + struct fdtdec_phandle_args arg; + fdt_addr_t addr; + fdt_size_t size; + + if (!info) { + dev_err(dev, "wrong pinctrl info\n"); + return -EINVAL; + } + + priv->dev = dev; + priv->info = info; + + addr = fdtdec_get_addr_size(gd->fdt_blob, dev->of_offset, "reg", &size); + + if (addr == FDT_ADDR_T_NONE) + return -EINVAL; + + info->base = map_sysmem(addr, size); + if (!info->base) + return -ENOMEM; + priv->info = info; + + /* + * Refer to linux documentation for details: + * Documentation/devicetree/bindings/pinctrl/fsl,imx7d-pinctrl.txt + */ + if (fdtdec_get_bool(gd->fdt_blob, node, "fsl,input-sel")) { + ret = fdtdec_parse_phandle_with_args(gd->fdt_blob, + node, "fsl,input-sel", + NULL, 0, 0, &arg); + if (ret) { + dev_err(dev, "iomuxc fsl,input-sel property not found\n"); + return -EINVAL; + } + + addr = fdtdec_get_addr_size(gd->fdt_blob, arg.node, "reg", + &size); + if (addr == FDT_ADDR_T_NONE) + return -EINVAL; + + info->input_sel_base = map_sysmem(addr, size); + if (!info->input_sel_base) + return -ENOMEM; + } + + dev_info(dev, "initialized IMX pinctrl driver\n"); + + return 0; +} + +int imx_pinctrl_remove(struct udevice *dev) +{ + struct imx_pinctrl_priv *priv = dev_get_priv(dev); + struct imx_pinctrl_soc_info *info = priv->info; + + if (info->input_sel_base) + unmap_sysmem(info->input_sel_base); + if (info->base) + unmap_sysmem(info->base); + + return 0; +} |