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@@ -0,0 +1,142 @@
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+// SPDX-License-Identifier: GPL-2.0
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+/*
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+ * MMIO register bitfield-controlled multiplexer driver
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+ * Based on the linux mmio multiplexer driver
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+ *
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+ * Copyright (C) 2017 Pengutronix, Philipp Zabel <kernel@pengutronix.de>
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+ * Copyright (C) 2019 Texas Instrument, Jean-jacques Hiblot <jjhiblot@ti.com>
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+ */
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+#include <common.h>
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+#include <dm.h>
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+#include <mux-internal.h>
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+#include <regmap.h>
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+#include <syscon.h>
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+#include <dm/device.h>
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+#include <dm/device_compat.h>
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+#include <dm/read.h>
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+#include <dm/devres.h>
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+#include <dt-bindings/mux/mux.h>
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+#include <linux/bitops.h>
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+
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+static int mux_mmio_set(struct mux_control *mux, int state)
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+{
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+ struct regmap_field **fields = dev_get_priv(mux->dev);
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+
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+ return regmap_field_write(fields[mux_control_get_index(mux)], state);
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+}
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+
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+static const struct mux_control_ops mux_mmio_ops = {
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+ .set = mux_mmio_set,
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+};
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+
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+static const struct udevice_id mmio_mux_of_match[] = {
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+ { .compatible = "mmio-mux" },
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+ { /* sentinel */ },
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+};
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+
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+static int mmio_mux_probe(struct udevice *dev)
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+{
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+ struct regmap_field **fields;
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+ struct mux_chip *mux_chip = dev_get_uclass_priv(dev);
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+ struct regmap *regmap;
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+ u32 *mux_reg_masks;
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+ u32 *idle_states;
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+ int num_fields;
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+ int ret;
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+ int i;
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+
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+ regmap = syscon_node_to_regmap(dev_ofnode(dev->parent));
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+ if (IS_ERR(regmap)) {
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+ ret = PTR_ERR(regmap);
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+ dev_err(dev, "failed to get regmap: %d\n", ret);
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+ return ret;
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+ }
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+
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+ num_fields = dev_read_size(dev, "mux-reg-masks");
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+ if (num_fields < 0)
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+ return log_msg_ret("mux-reg-masks missing", -EINVAL);
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+
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+ num_fields /= sizeof(u32);
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+ if (num_fields == 0 || num_fields % 2)
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+ ret = -EINVAL;
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+ num_fields = num_fields / 2;
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+
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+ ret = mux_alloc_controllers(dev, num_fields);
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+ if (ret < 0)
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+ return log_msg_ret("mux_alloc_controllers", ret);
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+
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+ fields = devm_kmalloc(dev, num_fields * sizeof(*fields), __GFP_ZERO);
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+ if (!fields)
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+ return -ENOMEM;
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+ dev->priv = fields;
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+
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+ mux_reg_masks = devm_kmalloc(dev, num_fields * 2 * sizeof(u32),
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+ __GFP_ZERO);
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+ if (!mux_reg_masks)
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+ return -ENOMEM;
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+
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+ ret = dev_read_u32_array(dev, "mux-reg-masks", mux_reg_masks,
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+ num_fields * 2);
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+ if (ret < 0)
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+ return log_msg_ret("mux-reg-masks read", ret);
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+
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+ idle_states = devm_kmalloc(dev, num_fields * sizeof(u32), __GFP_ZERO);
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+ if (!idle_states)
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+ return -ENOMEM;
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+
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+ ret = dev_read_u32_array(dev, "idle-states", idle_states, num_fields);
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+ if (ret < 0) {
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+ log_err("idle-states");
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+ devm_kfree(dev, idle_states);
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+ idle_states = NULL;
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+ }
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+
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+ for (i = 0; i < num_fields; i++) {
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+ struct mux_control *mux = &mux_chip->mux[i];
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+ struct reg_field field;
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+ u32 reg, mask;
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+ int bits;
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+
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+ reg = mux_reg_masks[2 * i];
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+ mask = mux_reg_masks[2 * i + 1];
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+
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+ field.reg = reg;
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+ field.msb = fls(mask) - 1;
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+ field.lsb = ffs(mask) - 1;
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+
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+ if (mask != GENMASK(field.msb, field.lsb))
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+ return log_msg_ret("invalid mask", -EINVAL);
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+
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+ fields[i] = devm_regmap_field_alloc(dev, regmap, field);
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+ if (IS_ERR(fields[i])) {
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+ ret = PTR_ERR(fields[i]);
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+ return log_msg_ret("regmap_field_alloc", ret);
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+ }
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+
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+ bits = 1 + field.msb - field.lsb;
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+ mux->states = 1 << bits;
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+
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+ if (!idle_states)
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+ continue;
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+
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+ if (idle_states[i] != MUX_IDLE_AS_IS &&
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+ idle_states[i] >= mux->states)
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+ return log_msg_ret("idle-states range", -EINVAL);
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+
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+ mux->idle_state = idle_states[i];
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+ }
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+
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+ devm_kfree(dev, mux_reg_masks);
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+ if (idle_states)
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+ devm_kfree(dev, idle_states);
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+
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+ return 0;
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+}
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+
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+U_BOOT_DRIVER(mmio_mux) = {
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+ .name = "mmio-mux",
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+ .id = UCLASS_MUX,
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+ .of_match = mmio_mux_of_match,
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+ .probe = mmio_mux_probe,
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+ .ops = &mux_mmio_ops,
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+};
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