1 files changed, 244 insertions, 0 deletions

diff --git a/drivers/pinctrl/pinctrl-pxa3xx.c b/drivers/pinctrl/pinctrl-pxa3xx.c
new file mode 100644
index 000000000000..079dce0e93e9
--- /dev/null
+++ b/drivers/pinctrl/pinctrl-pxa3xx.c
@@ -0,0 +1,244 @@
+/*
+ *  linux/drivers/pinctrl/pinctrl-pxa3xx.c
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License version 2 as
+ *  publishhed by the Free Software Foundation.
+ *
+ *  Copyright (C) 2011, Marvell Technology Group Ltd.
+ *
+ *  Author: Haojian Zhuang <haojian.zhuang@marvell.com>
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/io.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include "pinctrl-pxa3xx.h"
+
+static struct pinctrl_gpio_range pxa3xx_pinctrl_gpio_range = {
+        .name           = "PXA3xx GPIO",
+        .id             = 0,
+        .base           = 0,
+        .pin_base       = 0,
+};
+
+static int pxa3xx_list_groups(struct pinctrl_dev *pctrldev, unsigned selector)
+{
+        struct pxa3xx_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev);
+        if (selector >= info->num_grps)
+                return -EINVAL;
+        return 0;
+}
+
+static const char *pxa3xx_get_group_name(struct pinctrl_dev *pctrldev,
+                                         unsigned selector)
+{
+        struct pxa3xx_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev);
+        if (selector >= info->num_grps)
+                return NULL;
+        return info->grps[selector].name;
+}
+
+static int pxa3xx_get_group_pins(struct pinctrl_dev *pctrldev,
+                                 unsigned selector,
+                                 const unsigned **pins,
+                                 unsigned *num_pins)
+{
+        struct pxa3xx_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev);
+        if (selector >= info->num_grps)
+                return -EINVAL;
+        *pins = info->grps[selector].pins;
+        *num_pins = info->grps[selector].npins;
+        return 0;
+}
+
+static struct pinctrl_ops pxa3xx_pctrl_ops = {
+        .list_groups    = pxa3xx_list_groups,
+        .get_group_name = pxa3xx_get_group_name,
+        .get_group_pins = pxa3xx_get_group_pins,
+};
+
+static int pxa3xx_pmx_list_func(struct pinctrl_dev *pctrldev, unsigned func)
+{
+        struct pxa3xx_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev);
+        if (func >= info->num_funcs)
+                return -EINVAL;
+        return 0;
+}
+
+static const char *pxa3xx_pmx_get_func_name(struct pinctrl_dev *pctrldev,
+                                            unsigned func)
+{
+        struct pxa3xx_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev);
+        return info->funcs[func].name;
+}
+
+static int pxa3xx_pmx_get_groups(struct pinctrl_dev *pctrldev, unsigned func,
+                                 const char * const **groups,
+                                 unsigned * const num_groups)
+{
+        struct pxa3xx_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev);
+        *groups = info->funcs[func].groups;
+        *num_groups = info->funcs[func].num_groups;
+        return 0;
+}
+
+/* Return function number. If failure, return negative value. */
+static int match_mux(struct pxa3xx_mfp_pin *mfp, unsigned mux)
+{
+        int i;
+        for (i = 0; i < PXA3xx_MAX_MUX; i++) {
+                if (mfp->func[i] == mux)
+                        break;
+        }
+        if (i >= PXA3xx_MAX_MUX)
+                return -EINVAL;
+        return i;
+}
+
+/* check whether current pin configuration is valid. Negative for failure */
+static int match_group_mux(struct pxa3xx_pin_group *grp,
+                           struct pxa3xx_pinmux_info *info,
+                           unsigned mux)
+{
+        int i, pin, ret = 0;
+        for (i = 0; i < grp->npins; i++) {
+                pin = grp->pins[i];
+                ret = match_mux(&info->mfp[pin], mux);
+                if (ret < 0) {
+                        dev_err(info->dev, "Can't find mux %d on pin%d\n",
+                                mux, pin);
+                        break;
+                }
+        }
+        return ret;
+}
+
+static int pxa3xx_pmx_enable(struct pinctrl_dev *pctrldev, unsigned func,
+                             unsigned group)
+{
+        struct pxa3xx_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev);
+        struct pxa3xx_pin_group *pin_grp = &info->grps[group];
+        unsigned int data;
+        int i, mfpr, pin, pin_func;
+
+        if (!pin_grp->npins ||
+                (match_group_mux(pin_grp, info, pin_grp->mux) < 0)) {
+                dev_err(info->dev, "Failed to set the pin group: %d\n", group);
+                return -EINVAL;
+        }
+        for (i = 0; i < pin_grp->npins; i++) {
+                pin = pin_grp->pins[i];
+                pin_func = match_mux(&info->mfp[pin], pin_grp->mux);
+                mfpr = info->mfp[pin].mfpr;
+                data = readl_relaxed(info->virt_base + mfpr);
+                data &= ~MFPR_FUNC_MASK;
+                data |= pin_func;
+                writel_relaxed(data, info->virt_base + mfpr);
+        }
+        return 0;
+}
+
+static void pxa3xx_pmx_disable(struct pinctrl_dev *pctrldev, unsigned func,
+                               unsigned group)
+{
+}
+
+static int pxa3xx_pmx_request_gpio(struct pinctrl_dev *pctrldev,
+                                   struct pinctrl_gpio_range *range,
+                                   unsigned pin)
+{
+        struct pxa3xx_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev);
+        unsigned int data;
+        int pin_func, mfpr;
+
+        pin_func = match_mux(&info->mfp[pin], PXA3xx_MUX_GPIO);
+        if (pin_func < 0) {
+                dev_err(info->dev, "No GPIO function on pin%d (%s)\n",
+                        pin, info->pads[pin].name);
+                return -EINVAL;
+        }
+        mfpr = info->mfp[pin].mfpr;
+        /* write gpio function into mfpr register */
+        data = readl_relaxed(info->virt_base + mfpr) & ~MFPR_FUNC_MASK;
+        data |= pin_func;
+        writel_relaxed(data, info->virt_base + mfpr);
+        return 0;
+}
+
+static struct pinmux_ops pxa3xx_pmx_ops = {
+        .list_functions         = pxa3xx_pmx_list_func,
+        .get_function_name      = pxa3xx_pmx_get_func_name,
+        .get_function_groups    = pxa3xx_pmx_get_groups,
+        .enable                 = pxa3xx_pmx_enable,
+        .disable                = pxa3xx_pmx_disable,
+        .gpio_request_enable    = pxa3xx_pmx_request_gpio,
+};
+
+int pxa3xx_pinctrl_register(struct platform_device *pdev,
+                            struct pxa3xx_pinmux_info *info)
+{
+        struct pinctrl_desc *desc;
+        struct resource *res;
+        int ret = 0;
+
+        if (!info || !info->cputype)
+                return -EINVAL;
+        desc = info->desc;
+        desc->pins = info->pads;
+        desc->npins = info->num_pads;
+        desc->pctlops = &pxa3xx_pctrl_ops;
+        desc->pmxops = &pxa3xx_pmx_ops;
+        info->dev = &pdev->dev;
+        pxa3xx_pinctrl_gpio_range.npins = info->num_gpio;
+
+        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (!res)
+                return -ENOENT;
+        info->phy_base = res->start;
+        info->phy_size = resource_size(res);
+        info->virt_base = ioremap(info->phy_base, info->phy_size);
+        if (!info->virt_base)
+                return -ENOMEM;
+        info->pctrl = pinctrl_register(desc, &pdev->dev, info);
+        if (!info->pctrl) {
+                dev_err(&pdev->dev, "failed to register PXA pinmux driver\n");
+                ret = -EINVAL;
+                goto err;
+        }
+        pinctrl_add_gpio_range(info->pctrl, &pxa3xx_pinctrl_gpio_range);
+        platform_set_drvdata(pdev, info);
+        return 0;
+err:
+        iounmap(info->virt_base);
+        return ret;
+}
+
+int pxa3xx_pinctrl_unregister(struct platform_device *pdev)
+{
+        struct pxa3xx_pinmux_info *info = platform_get_drvdata(pdev);
+
+        pinctrl_unregister(info->pctrl);
+        iounmap(info->virt_base);
+        platform_set_drvdata(pdev, NULL);
+        return 0;
+}
+
+static int __init pxa3xx_pinctrl_init(void)
+{
+        pr_info("pxa3xx-pinctrl: PXA3xx pinctrl driver initializing\n");
+        return 0;
+}
+core_initcall_sync(pxa3xx_pinctrl_init);
+
+static void __exit pxa3xx_pinctrl_exit(void)
+{
+}
+module_exit(pxa3xx_pinctrl_exit);
+
+MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
+MODULE_DESCRIPTION("PXA3xx pin control driver");
+MODULE_LICENSE("GPL v2");