[PATCH 3/4] ARM: imx: pinctrl-imx: imx7d: add support for iomuxc lpsr
Zhi Li
lznuaa at gmail.com
Fri Jun 19 13:26:22 PDT 2015
On Fri, Jun 19, 2015 at 2:59 PM, Adrian Alonso <aalonso at freescale.com> wrote:
> * Extend pinctrl-imx driver to support iomux lpsr conntroller,
> * iMX7D has two iomuxc controllers, iomuxc controller similar as
> previous iMX SoC generation and iomuxc-lpsr which provides
> low power state rentetion capabilities on gpios that are part of
> iomuxc-lpsr (GPIO1_IO7..GPIO1_IO0).
> * Use IOMUXC_LPSR_SUPPORT and iput_val most significant bits to
> properly configure iomuxc/iomuxc-lpsr settings.
>
> Signed-off-by: Adrian Alonso <aalonso at freescale.com>
> ---
> drivers/pinctrl/freescale/pinctrl-imx.c | 75 +++++++++++++++++++++++----------
> drivers/pinctrl/freescale/pinctrl-imx.h | 6 ++-
> 2 files changed, 57 insertions(+), 24 deletions(-)
>
> diff --git a/drivers/pinctrl/freescale/pinctrl-imx.c b/drivers/pinctrl/freescale/pinctrl-imx.c
> index d7b98ba..2d434ac 100644
> --- a/drivers/pinctrl/freescale/pinctrl-imx.c
> +++ b/drivers/pinctrl/freescale/pinctrl-imx.c
> @@ -1,7 +1,7 @@
> /*
> * Core driver for the imx pin controller
> *
> - * Copyright (C) 2012 Freescale Semiconductor, Inc.
> + * Copyright (C) 2012-2015 Freescale Semiconductor, Inc.
> * Copyright (C) 2012 Linaro Ltd.
> *
> * Author: Dong Aisheng <dong.aisheng at linaro.org>
> @@ -18,6 +18,7 @@
> #include <linux/module.h>
> #include <linux/of.h>
> #include <linux/of_device.h>
> +#include <linux/of_address.h>
> #include <linux/pinctrl/machine.h>
> #include <linux/pinctrl/pinconf.h>
> #include <linux/pinctrl/pinctrl.h>
> @@ -38,7 +39,6 @@
> struct imx_pinctrl {
> struct device *dev;
> struct pinctrl_dev *pctl;
> - void __iomem *base;
> const struct imx_pinctrl_soc_info *info;
> };
>
> @@ -212,12 +212,12 @@ static int imx_pmx_set(struct pinctrl_dev *pctldev, unsigned selector,
>
> if (info->flags & SHARE_MUX_CONF_REG) {
> u32 reg;
> - reg = readl(ipctl->base + pin_reg->mux_reg);
> + reg = readl(pin_reg->base + pin_reg->mux_reg);
> reg &= ~(0x7 << 20);
> reg |= (pin->mux_mode << 20);
> - writel(reg, ipctl->base + pin_reg->mux_reg);
> + writel(reg, pin_reg->base + pin_reg->mux_reg);
> } else {
> - writel(pin->mux_mode, ipctl->base + pin_reg->mux_reg);
> + writel(pin->mux_mode, pin_reg->base + pin_reg->mux_reg);
> }
> dev_dbg(ipctl->dev, "write: offset 0x%x val 0x%x\n",
> pin_reg->mux_reg, pin->mux_mode);
> @@ -245,16 +245,22 @@ static int imx_pmx_set(struct pinctrl_dev *pctldev, unsigned selector,
> * The input_reg[i] here is actually some IOMUXC general
> * purpose register, not regular select input register.
> */
> - val = readl(ipctl->base + pin->input_reg);
> + val = readl(pin_reg->base + pin->input_reg);
> val &= ~mask;
> val |= select << shift;
> - writel(val, ipctl->base + pin->input_reg);
> + writel(val, pin_reg->base + pin->input_reg);
> } else if (pin->input_reg) {
> /*
> * Regular select input register can never be at offset
> * 0, and we only print register value for regular case.
> */
> - writel(pin->input_val, ipctl->base + pin->input_reg);
> + if (info->flags & IOMUXC_LPSR_SUPPORT &&
> + pin->input_val >> 24) {
> + writel(pin->input_val, info->base + pin->input_reg);
Please add comment here, LPSR select input register shared with normal IOMUX.
> + } else {
> + writel(pin->input_val, pin_reg->base + pin->input_reg);
> + }
> +
> dev_dbg(ipctl->dev,
> "==>select_input: offset 0x%x val 0x%x\n",
> pin->input_reg, pin->input_val);
> @@ -326,10 +332,10 @@ static int imx_pmx_gpio_request_enable(struct pinctrl_dev *pctldev,
> return -EINVAL;
>
> mux_pin:
> - reg = readl(ipctl->base + pin_reg->mux_reg);
> + reg = readl(pin_reg->base + pin_reg->mux_reg);
> reg &= ~(0x7 << 20);
> reg |= imx_pin->config;
> - writel(reg, ipctl->base + pin_reg->mux_reg);
> + writel(reg, pin_reg->base + pin_reg->mux_reg);
>
> return 0;
> }
> @@ -354,12 +360,12 @@ static int imx_pmx_gpio_set_direction(struct pinctrl_dev *pctldev,
> return -EINVAL;
>
> /* IBE always enabled allows us to read the value "on the wire" */
> - reg = readl(ipctl->base + pin_reg->mux_reg);
> + reg = readl(pin_reg->base + pin_reg->mux_reg);
> if (input)
> reg &= ~0x2;
> else
> reg |= 0x2;
> - writel(reg, ipctl->base + pin_reg->mux_reg);
> + writel(reg, pin_reg->base + pin_reg->mux_reg);
>
> return 0;
> }
> @@ -386,7 +392,7 @@ static int imx_pinconf_get(struct pinctrl_dev *pctldev,
> return -EINVAL;
> }
>
> - *config = readl(ipctl->base + pin_reg->conf_reg);
> + *config = readl(pin_reg->base + pin_reg->conf_reg);
>
> if (info->flags & SHARE_MUX_CONF_REG)
> *config &= 0xffff;
> @@ -415,12 +421,12 @@ static int imx_pinconf_set(struct pinctrl_dev *pctldev,
> for (i = 0; i < num_configs; i++) {
> if (info->flags & SHARE_MUX_CONF_REG) {
> u32 reg;
> - reg = readl(ipctl->base + pin_reg->conf_reg);
> + reg = readl(pin_reg->base + pin_reg->conf_reg);
> reg &= ~0xffff;
> reg |= configs[i];
> - writel(reg, ipctl->base + pin_reg->conf_reg);
> + writel(reg, pin_reg->base + pin_reg->conf_reg);
> } else {
> - writel(configs[i], ipctl->base + pin_reg->conf_reg);
> + writel(configs[i], pin_reg->base + pin_reg->conf_reg);
> }
> dev_dbg(ipctl->dev, "write: offset 0x%x val 0x%lx\n",
> pin_reg->conf_reg, configs[i]);
> @@ -442,7 +448,7 @@ static void imx_pinconf_dbg_show(struct pinctrl_dev *pctldev,
> return;
> }
>
> - config = readl(ipctl->base + pin_reg->conf_reg);
> + config = readl(pin_reg->base + pin_reg->conf_reg);
> seq_printf(s, "0x%lx", config);
> }
>
> @@ -551,14 +557,27 @@ static int imx_pinctrl_parse_groups(struct device_node *np,
> }
>
> pin_id = mux_reg ? mux_reg / 4 : conf_reg / 4;
> +
> + pin->input_reg = be32_to_cpu(*list++);
> + pin->mux_mode = be32_to_cpu(*list++);
> + pin->input_val = be32_to_cpu(*list++);
> +
> + if (info->flags & IOMUXC_LPSR_SUPPORT) {
> + if (pin->input_val >> 24)
> + pin_id = pin->input_val >> 24 & 0xff;
> + }
> +
It limited normal pin_id is 255 - number of lpsr,
which many too small and easy exceed in future chip.
I think it'd better at least 4096. or 16bit, 65536.
> pin_reg = &info->pin_regs[pin_id];
> pin->pin = pin_id;
> grp->pin_ids[i] = pin_id;
> pin_reg->mux_reg = mux_reg;
> pin_reg->conf_reg = conf_reg;
> - pin->input_reg = be32_to_cpu(*list++);
> - pin->mux_mode = be32_to_cpu(*list++);
> - pin->input_val = be32_to_cpu(*list++);
> + pin_reg->base = info->base;
> +
> + if (info->flags & IOMUXC_LPSR_SUPPORT) {
> + if (pin->input_val >> 24)
> + pin_reg->base = info->base_lpsr;
> + }
>
> /* SION bit is in mux register */
> config = be32_to_cpu(*list++);
> @@ -683,6 +702,7 @@ static int imx_pinctrl_probe_dt(struct platform_device *pdev,
> int imx_pinctrl_probe(struct platform_device *pdev,
> struct imx_pinctrl_soc_info *info)
> {
> + struct device_node *dev_np = pdev->dev.of_node;
> struct imx_pinctrl *ipctl;
> struct resource *res;
> int ret, i;
> @@ -709,9 +729,18 @@ int imx_pinctrl_probe(struct platform_device *pdev,
> }
>
> res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> - ipctl->base = devm_ioremap_resource(&pdev->dev, res);
> - if (IS_ERR(ipctl->base))
> - return PTR_ERR(ipctl->base);
> + info->base = devm_ioremap_resource(&pdev->dev, res);
> + if (IS_ERR(info->base))
> + return PTR_ERR(info->base);
> +
> + if (info->flags & IOMUXC_LPSR_SUPPORT) {
> + info->base_lpsr = of_iomap(dev_np, 1);
> + if (IS_ERR(info->base_lpsr)) {
> + dev_err(&pdev->dev,
> + "iomuxc-lpsr base address not found\n");
> + return PTR_ERR(info->base_lpsr);
> + }
> + }
>
> imx_pinctrl_desc.name = dev_name(&pdev->dev);
> imx_pinctrl_desc.pins = info->pins;
> diff --git a/drivers/pinctrl/freescale/pinctrl-imx.h b/drivers/pinctrl/freescale/pinctrl-imx.h
> index 49e55d3..b3e00db 100644
> --- a/drivers/pinctrl/freescale/pinctrl-imx.h
> +++ b/drivers/pinctrl/freescale/pinctrl-imx.h
> @@ -1,7 +1,7 @@
> /*
> * IMX pinmux core definitions
> *
> - * Copyright (C) 2012 Freescale Semiconductor, Inc.
> + * Copyright (C) 2012-2015 Freescale Semiconductor, Inc.
> * Copyright (C) 2012 Linaro Ltd.
> *
> * Author: Dong Aisheng <dong.aisheng at linaro.org>
> @@ -69,6 +69,7 @@ struct imx_pmx_func {
> struct imx_pin_reg {
> s16 mux_reg;
> s16 conf_reg;
> + void __iomem *base;
> };
>
> struct imx_pinctrl_soc_info {
> @@ -81,9 +82,12 @@ struct imx_pinctrl_soc_info {
> struct imx_pmx_func *functions;
> unsigned int nfunctions;
> unsigned int flags;
> + void __iomem *base;
> + void __iomem *base_lpsr;
> };
>
> #define SHARE_MUX_CONF_REG 0x1
> +#define IOMUXC_LPSR_SUPPORT 0x2
>
> #define NO_MUX 0x0
> #define NO_PAD 0x0
> --
> 2.1.4
>
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