Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / reset / sti / reset-syscfg.c

diff --git a/kernel/drivers/reset/sti/reset-syscfg.c b/kernel/drivers/reset/sti/reset-syscfg.c
new file mode 100644 (file)
index 0000000..a145cc0
--- /dev/null
+++ b/kernel/drivers/reset/sti/reset-syscfg.c
@@ -0,0 +1,186 @@
+/*
+ * Copyright (C) 2013 STMicroelectronics Limited
+ * Author: Stephen Gallimore <stephen.gallimore@st.com>
+ *
+ * Inspired by mach-imx/src.c
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/module.h>
+#include <linux/err.h>
+#include <linux/types.h>
+#include <linux/of_device.h>
+#include <linux/regmap.h>
+#include <linux/mfd/syscon.h>
+
+#include "reset-syscfg.h"
+
+/**
+ * Reset channel regmap configuration
+ *
+ * @reset: regmap field for the channel's reset bit.
+ * @ack: regmap field for the channel's ack bit (optional).
+ */
+struct syscfg_reset_channel {
+       struct regmap_field *reset;
+       struct regmap_field *ack;
+};
+
+/**
+ * A reset controller which groups together a set of related reset bits, which
+ * may be located in different system configuration registers.
+ *
+ * @rst: base reset controller structure.
+ * @active_low: are the resets in this controller active low, i.e. clearing
+ *              the reset bit puts the hardware into reset.
+ * @channels: An array of reset channels for this controller.
+ */
+struct syscfg_reset_controller {
+       struct reset_controller_dev rst;
+       bool active_low;
+       struct syscfg_reset_channel *channels;
+};
+
+#define to_syscfg_reset_controller(_rst) \
+       container_of(_rst, struct syscfg_reset_controller, rst)
+
+static int syscfg_reset_program_hw(struct reset_controller_dev *rcdev,
+                                  unsigned long idx, int assert)
+{
+       struct syscfg_reset_controller *rst = to_syscfg_reset_controller(rcdev);
+       const struct syscfg_reset_channel *ch;
+       u32 ctrl_val = rst->active_low ? !assert : !!assert;
+       int err;
+
+       if (idx >= rcdev->nr_resets)
+               return -EINVAL;
+
+       ch = &rst->channels[idx];
+
+       err = regmap_field_write(ch->reset, ctrl_val);
+       if (err)
+               return err;
+
+       if (ch->ack) {
+               unsigned long timeout = jiffies + msecs_to_jiffies(1000);
+               u32 ack_val;
+
+               while (true) {
+                       err = regmap_field_read(ch->ack, &ack_val);
+                       if (err)
+                               return err;
+
+                       if (ack_val == ctrl_val)
+                               break;
+
+                       if (time_after(jiffies, timeout))
+                               return -ETIME;
+
+                       cpu_relax();
+               }
+       }
+
+       return 0;
+}
+
+static int syscfg_reset_assert(struct reset_controller_dev *rcdev,
+                              unsigned long idx)
+{
+       return syscfg_reset_program_hw(rcdev, idx, true);
+}
+
+static int syscfg_reset_deassert(struct reset_controller_dev *rcdev,
+                                unsigned long idx)
+{
+       return syscfg_reset_program_hw(rcdev, idx, false);
+}
+
+static int syscfg_reset_dev(struct reset_controller_dev *rcdev,
+                           unsigned long idx)
+{
+       int err = syscfg_reset_assert(rcdev, idx);
+       if (err)
+               return err;
+
+       return syscfg_reset_deassert(rcdev, idx);
+}
+
+static struct reset_control_ops syscfg_reset_ops = {
+       .reset    = syscfg_reset_dev,
+       .assert   = syscfg_reset_assert,
+       .deassert = syscfg_reset_deassert,
+};
+
+static int syscfg_reset_controller_register(struct device *dev,
+                               const struct syscfg_reset_controller_data *data)
+{
+       struct syscfg_reset_controller *rc;
+       size_t size;
+       int i, err;
+
+       rc = devm_kzalloc(dev, sizeof(*rc), GFP_KERNEL);
+       if (!rc)
+               return -ENOMEM;
+
+       size = sizeof(struct syscfg_reset_channel) * data->nr_channels;
+
+       rc->channels = devm_kzalloc(dev, size, GFP_KERNEL);
+       if (!rc->channels)
+               return -ENOMEM;
+
+       rc->rst.ops = &syscfg_reset_ops,
+       rc->rst.of_node = dev->of_node;
+       rc->rst.nr_resets = data->nr_channels;
+       rc->active_low = data->active_low;
+
+       for (i = 0; i < data->nr_channels; i++) {
+               struct regmap *map;
+               struct regmap_field *f;
+               const char *compatible = data->channels[i].compatible;
+
+               map = syscon_regmap_lookup_by_compatible(compatible);
+               if (IS_ERR(map))
+                       return PTR_ERR(map);
+
+               f = devm_regmap_field_alloc(dev, map, data->channels[i].reset);
+               if (IS_ERR(f))
+                       return PTR_ERR(f);
+
+               rc->channels[i].reset = f;
+
+               if (!data->wait_for_ack)
+                       continue;
+
+               f = devm_regmap_field_alloc(dev, map, data->channels[i].ack);
+               if (IS_ERR(f))
+                       return PTR_ERR(f);
+
+               rc->channels[i].ack = f;
+       }
+
+       err = reset_controller_register(&rc->rst);
+       if (!err)
+               dev_info(dev, "registered\n");
+
+       return err;
+}
+
+int syscfg_reset_probe(struct platform_device *pdev)
+{
+       struct device *dev = pdev ? &pdev->dev : NULL;
+       const struct of_device_id *match;
+
+       if (!dev || !dev->driver)
+               return -ENODEV;
+
+       match = of_match_device(dev->driver->of_match_table, dev);
+       if (!match || !match->data)
+               return -EINVAL;
+
+       return syscfg_reset_controller_register(dev, match->data);
+}