1 files changed, 332 insertions, 0 deletions

diff --git a/drivers/net/wireless/silabs/wfx/hwio.c b/drivers/net/wireless/silabs/wfx/hwio.c
new file mode 100644
index 000000000000..3f9750b470be
--- /dev/null
+++ b/drivers/net/wireless/silabs/wfx/hwio.c
@@ -0,0 +1,332 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Low-level I/O functions.
+ *
+ * Copyright (c) 2017-2020, Silicon Laboratories, Inc.
+ * Copyright (c) 2010, ST-Ericsson
+ */
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <linux/align.h>
+
+#include "hwio.h"
+#include "wfx.h"
+#include "bus.h"
+#include "traces.h"
+
+#define WFX_HIF_BUFFER_SIZE 0x2000
+
+static int wfx_read32(struct wfx_dev *wdev, int reg, u32 *val)
+{
+	int ret;
+	__le32 *tmp = kmalloc(sizeof(u32), GFP_KERNEL);
+
+	*val = ~0; /* Never return undefined value */
+	if (!tmp)
+		return -ENOMEM;
+	ret = wdev->hwbus_ops->copy_from_io(wdev->hwbus_priv, reg, tmp, sizeof(u32));
+	if (ret >= 0)
+		*val = le32_to_cpu(*tmp);
+	kfree(tmp);
+	if (ret)
+		dev_err(wdev->dev, "%s: bus communication error: %d\n", __func__, ret);
+	return ret;
+}
+
+static int wfx_write32(struct wfx_dev *wdev, int reg, u32 val)
+{
+	int ret;
+	__le32 *tmp = kmalloc(sizeof(u32), GFP_KERNEL);
+
+	if (!tmp)
+		return -ENOMEM;
+	*tmp = cpu_to_le32(val);
+	ret = wdev->hwbus_ops->copy_to_io(wdev->hwbus_priv, reg, tmp, sizeof(u32));
+	kfree(tmp);
+	if (ret)
+		dev_err(wdev->dev, "%s: bus communication error: %d\n", __func__, ret);
+	return ret;
+}
+
+static int wfx_read32_locked(struct wfx_dev *wdev, int reg, u32 *val)
+{
+	int ret;
+
+	wdev->hwbus_ops->lock(wdev->hwbus_priv);
+	ret = wfx_read32(wdev, reg, val);
+	_trace_io_read32(reg, *val);
+	wdev->hwbus_ops->unlock(wdev->hwbus_priv);
+	return ret;
+}
+
+static int wfx_write32_locked(struct wfx_dev *wdev, int reg, u32 val)
+{
+	int ret;
+
+	wdev->hwbus_ops->lock(wdev->hwbus_priv);
+	ret = wfx_write32(wdev, reg, val);
+	_trace_io_write32(reg, val);
+	wdev->hwbus_ops->unlock(wdev->hwbus_priv);
+	return ret;
+}
+
+static int wfx_write32_bits_locked(struct wfx_dev *wdev, int reg, u32 mask, u32 val)
+{
+	int ret;
+	u32 val_r, val_w;
+
+	WARN_ON(~mask & val);
+	val &= mask;
+	wdev->hwbus_ops->lock(wdev->hwbus_priv);
+	ret = wfx_read32(wdev, reg, &val_r);
+	_trace_io_read32(reg, val_r);
+	if (ret < 0)
+		goto err;
+	val_w = (val_r & ~mask) | val;
+	if (val_w != val_r) {
+		ret = wfx_write32(wdev, reg, val_w);
+		_trace_io_write32(reg, val_w);
+	}
+err:
+	wdev->hwbus_ops->unlock(wdev->hwbus_priv);
+	return ret;
+}
+
+static int wfx_indirect_read(struct wfx_dev *wdev, int reg, u32 addr, void *buf, size_t len)
+{
+	int ret;
+	int i;
+	u32 cfg;
+	u32 prefetch;
+
+	WARN_ON(len >= WFX_HIF_BUFFER_SIZE);
+	WARN_ON(reg != WFX_REG_AHB_DPORT && reg != WFX_REG_SRAM_DPORT);
+
+	if (reg == WFX_REG_AHB_DPORT)
+		prefetch = CFG_PREFETCH_AHB;
+	else if (reg == WFX_REG_SRAM_DPORT)
+		prefetch = CFG_PREFETCH_SRAM;
+	else
+		return -ENODEV;
+
+	ret = wfx_write32(wdev, WFX_REG_BASE_ADDR, addr);
+	if (ret < 0)
+		goto err;
+
+	ret = wfx_read32(wdev, WFX_REG_CONFIG, &cfg);
+	if (ret < 0)
+		goto err;
+
+	ret = wfx_write32(wdev, WFX_REG_CONFIG, cfg | prefetch);
+	if (ret < 0)
+		goto err;
+
+	for (i = 0; i < 20; i++) {
+		ret = wfx_read32(wdev, WFX_REG_CONFIG, &cfg);
+		if (ret < 0)
+			goto err;
+		if (!(cfg & prefetch))
+			break;
+		usleep_range(200, 250);
+	}
+	if (i == 20) {
+		ret = -ETIMEDOUT;
+		goto err;
+	}
+
+	ret = wdev->hwbus_ops->copy_from_io(wdev->hwbus_priv, reg, buf, len);
+
+err:
+	if (ret < 0)
+		memset(buf, 0xFF, len); /* Never return undefined value */
+	return ret;
+}
+
+static int wfx_indirect_write(struct wfx_dev *wdev, int reg, u32 addr,
+			      const void *buf, size_t len)
+{
+	int ret;
+
+	WARN_ON(len >= WFX_HIF_BUFFER_SIZE);
+	WARN_ON(reg != WFX_REG_AHB_DPORT && reg != WFX_REG_SRAM_DPORT);
+	ret = wfx_write32(wdev, WFX_REG_BASE_ADDR, addr);
+	if (ret < 0)
+		return ret;
+
+	return wdev->hwbus_ops->copy_to_io(wdev->hwbus_priv, reg, buf, len);
+}
+
+static int wfx_indirect_read_locked(struct wfx_dev *wdev, int reg, u32 addr,
+				    void *buf, size_t len)
+{
+	int ret;
+
+	wdev->hwbus_ops->lock(wdev->hwbus_priv);
+	ret = wfx_indirect_read(wdev, reg, addr, buf, len);
+	_trace_io_ind_read(reg, addr, buf, len);
+	wdev->hwbus_ops->unlock(wdev->hwbus_priv);
+	return ret;
+}
+
+static int wfx_indirect_write_locked(struct wfx_dev *wdev, int reg, u32 addr,
+				     const void *buf, size_t len)
+{
+	int ret;
+
+	wdev->hwbus_ops->lock(wdev->hwbus_priv);
+	ret = wfx_indirect_write(wdev, reg, addr, buf, len);
+	_trace_io_ind_write(reg, addr, buf, len);
+	wdev->hwbus_ops->unlock(wdev->hwbus_priv);
+	return ret;
+}
+
+static int wfx_indirect_read32_locked(struct wfx_dev *wdev, int reg, u32 addr, u32 *val)
+{
+	int ret;
+	__le32 *tmp = kmalloc(sizeof(u32), GFP_KERNEL);
+
+	if (!tmp)
+		return -ENOMEM;
+	wdev->hwbus_ops->lock(wdev->hwbus_priv);
+	ret = wfx_indirect_read(wdev, reg, addr, tmp, sizeof(u32));
+	*val = le32_to_cpu(*tmp);
+	_trace_io_ind_read32(reg, addr, *val);
+	wdev->hwbus_ops->unlock(wdev->hwbus_priv);
+	kfree(tmp);
+	return ret;
+}
+
+static int wfx_indirect_write32_locked(struct wfx_dev *wdev, int reg, u32 addr, u32 val)
+{
+	int ret;
+	__le32 *tmp = kmalloc(sizeof(u32), GFP_KERNEL);
+
+	if (!tmp)
+		return -ENOMEM;
+	*tmp = cpu_to_le32(val);
+	wdev->hwbus_ops->lock(wdev->hwbus_priv);
+	ret = wfx_indirect_write(wdev, reg, addr, tmp, sizeof(u32));
+	_trace_io_ind_write32(reg, addr, val);
+	wdev->hwbus_ops->unlock(wdev->hwbus_priv);
+	kfree(tmp);
+	return ret;
+}
+
+int wfx_data_read(struct wfx_dev *wdev, void *buf, size_t len)
+{
+	int ret;
+
+	WARN(!IS_ALIGNED((uintptr_t)buf, 4), "unaligned buffer");
+	wdev->hwbus_ops->lock(wdev->hwbus_priv);
+	ret = wdev->hwbus_ops->copy_from_io(wdev->hwbus_priv, WFX_REG_IN_OUT_QUEUE, buf, len);
+	_trace_io_read(WFX_REG_IN_OUT_QUEUE, buf, len);
+	wdev->hwbus_ops->unlock(wdev->hwbus_priv);
+	if (ret)
+		dev_err(wdev->dev, "%s: bus communication error: %d\n", __func__, ret);
+	return ret;
+}
+
+int wfx_data_write(struct wfx_dev *wdev, const void *buf, size_t len)
+{
+	int ret;
+
+	WARN(!IS_ALIGNED((uintptr_t)buf, 4), "unaligned buffer");
+	wdev->hwbus_ops->lock(wdev->hwbus_priv);
+	ret = wdev->hwbus_ops->copy_to_io(wdev->hwbus_priv, WFX_REG_IN_OUT_QUEUE, buf, len);
+	_trace_io_write(WFX_REG_IN_OUT_QUEUE, buf, len);
+	wdev->hwbus_ops->unlock(wdev->hwbus_priv);
+	if (ret)
+		dev_err(wdev->dev, "%s: bus communication error: %d\n", __func__, ret);
+	return ret;
+}
+
+int wfx_sram_buf_read(struct wfx_dev *wdev, u32 addr, void *buf, size_t len)
+{
+	return wfx_indirect_read_locked(wdev, WFX_REG_SRAM_DPORT, addr, buf, len);
+}
+
+int wfx_ahb_buf_read(struct wfx_dev *wdev, u32 addr, void *buf, size_t len)
+{
+	return wfx_indirect_read_locked(wdev, WFX_REG_AHB_DPORT, addr, buf, len);
+}
+
+int wfx_sram_buf_write(struct wfx_dev *wdev, u32 addr, const void *buf, size_t len)
+{
+	return wfx_indirect_write_locked(wdev, WFX_REG_SRAM_DPORT, addr, buf, len);
+}
+
+int wfx_ahb_buf_write(struct wfx_dev *wdev, u32 addr, const void *buf, size_t len)
+{
+	return wfx_indirect_write_locked(wdev, WFX_REG_AHB_DPORT, addr, buf, len);
+}
+
+int wfx_sram_reg_read(struct wfx_dev *wdev, u32 addr, u32 *val)
+{
+	return wfx_indirect_read32_locked(wdev, WFX_REG_SRAM_DPORT, addr, val);
+}
+
+int wfx_ahb_reg_read(struct wfx_dev *wdev, u32 addr, u32 *val)
+{
+	return wfx_indirect_read32_locked(wdev, WFX_REG_AHB_DPORT, addr, val);
+}
+
+int wfx_sram_reg_write(struct wfx_dev *wdev, u32 addr, u32 val)
+{
+	return wfx_indirect_write32_locked(wdev, WFX_REG_SRAM_DPORT, addr, val);
+}
+
+int wfx_ahb_reg_write(struct wfx_dev *wdev, u32 addr, u32 val)
+{
+	return wfx_indirect_write32_locked(wdev, WFX_REG_AHB_DPORT, addr, val);
+}
+
+int wfx_config_reg_read(struct wfx_dev *wdev, u32 *val)
+{
+	return wfx_read32_locked(wdev, WFX_REG_CONFIG, val);
+}
+
+int wfx_config_reg_write(struct wfx_dev *wdev, u32 val)
+{
+	return wfx_write32_locked(wdev, WFX_REG_CONFIG, val);
+}
+
+int wfx_config_reg_write_bits(struct wfx_dev *wdev, u32 mask, u32 val)
+{
+	return wfx_write32_bits_locked(wdev, WFX_REG_CONFIG, mask, val);
+}
+
+int wfx_control_reg_read(struct wfx_dev *wdev, u32 *val)
+{
+	return wfx_read32_locked(wdev, WFX_REG_CONTROL, val);
+}
+
+int wfx_control_reg_write(struct wfx_dev *wdev, u32 val)
+{
+	return wfx_write32_locked(wdev, WFX_REG_CONTROL, val);
+}
+
+int wfx_control_reg_write_bits(struct wfx_dev *wdev, u32 mask, u32 val)
+{
+	return wfx_write32_bits_locked(wdev, WFX_REG_CONTROL, mask, val);
+}
+
+int wfx_igpr_reg_read(struct wfx_dev *wdev, int index, u32 *val)
+{
+	int ret;
+
+	*val = ~0; /* Never return undefined value */
+	ret = wfx_write32_locked(wdev, WFX_REG_SET_GEN_R_W, IGPR_RW | index << 24);
+	if (ret)
+		return ret;
+	ret = wfx_read32_locked(wdev, WFX_REG_SET_GEN_R_W, val);
+	if (ret)
+		return ret;
+	*val &= IGPR_VALUE;
+	return ret;
+}
+
+int wfx_igpr_reg_write(struct wfx_dev *wdev, int index, u32 val)
+{
+	return wfx_write32_locked(wdev, WFX_REG_SET_GEN_R_W, index << 24 | val);
+}