u-boot/drivers/pinctrl/nxp/pinctrl-imx.c
Peng Fan 745df68d36 pinctrl: imx: Introduce pinctrl driver for i.MX6
Introduce pinctrl for i.MX6
1. pinctrl-imx.c is for common usage. It's used by i.MX6/7.
2. Add PINCTRL_IMX PINCTRL_IMX6 Kconfig entry.
3. To the pinctrl_ops implementation, only set_state is implemented.
   To i.MX6/7, the pinctrl dts entry is as following:
&iomuxc {
        pinctrl-names = "default";

        pinctrl_csi1: csi1grp {
                fsl,pins = <
                MX6UL_PAD_CSI_MCLK__CSI_MCLK            0x1b088
                MX6UL_PAD_CSI_PIXCLK__CSI_PIXCLK        0x1b088
                MX6UL_PAD_CSI_VSYNC__CSI_VSYNC          0x1b088
                >;
        };

        [.....]
};
  there is no property named function or groups. So pinctrl_generic_set_state
  can not be used here.
5. This driver is a simple implementation for i.mx iomux controller,
   only parse the fsl,pins property and write value to registers.
6. With DEBUG enabled, we can see log when "i2c bus 0":
   "
   set_state_simple op missing
   imx_pinctrl_set_state: i2c1grp
   mux_reg 0x14c, conf_reg 0x3bc, input_reg 0x5d8, mux_mode 0x0, input_val 0x1, config_val 0x4000007f
   write mux: offset 0x14c val 0x10
   select_input: offset 0x5d8 val 0x1
   write config: offset 0x3bc val 0x7f
   mux_reg 0x148, conf_reg 0x3b8, input_reg 0x5d4, mux_mode 0x0, input_val 0x1, config_val 0x4000007f
   write mux: offset 0x148 val 0x10
   select_input: offset 0x5d4 val 0x1
   write config: offset 0x3b8 val 0x7f
   "
   this means imx6 pinctrl driver works as expected.

Signed-off-by: Peng Fan <van.freenix@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
2016-02-21 11:23:48 +01:00

241 lines
5.9 KiB
C

/*
* 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;
}