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- // 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 "hwio.h"
- #include "wfx.h"
- #include "bus.h"
- #include "traces.h"
- /*
- * Internal helpers.
- *
- * About CONFIG_VMAP_STACK:
- * When CONFIG_VMAP_STACK is enabled, it is not possible to run DMA on stack
- * allocated data. Functions below that work with registers (aka functions
- * ending with "32") automatically reallocate buffers with kmalloc. However,
- * functions that work with arbitrary length buffers let's caller to handle
- * memory location. In doubt, enable CONFIG_DEBUG_SG to detect badly located
- * buffer.
- */
- static int 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 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 read32_locked(struct wfx_dev *wdev, int reg, u32 *val)
- {
- int ret;
- wdev->hwbus_ops->lock(wdev->hwbus_priv);
- ret = read32(wdev, reg, val);
- _trace_io_read32(reg, *val);
- wdev->hwbus_ops->unlock(wdev->hwbus_priv);
- return ret;
- }
- static int write32_locked(struct wfx_dev *wdev, int reg, u32 val)
- {
- int ret;
- wdev->hwbus_ops->lock(wdev->hwbus_priv);
- ret = write32(wdev, reg, val);
- _trace_io_write32(reg, val);
- wdev->hwbus_ops->unlock(wdev->hwbus_priv);
- return ret;
- }
- static int 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 = 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 = write32(wdev, reg, val_w);
- _trace_io_write32(reg, val_w);
- }
- err:
- wdev->hwbus_ops->unlock(wdev->hwbus_priv);
- return ret;
- }
- static int 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 >= 0x2000);
- 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 = write32(wdev, WFX_REG_BASE_ADDR, addr);
- if (ret < 0)
- goto err;
- ret = read32(wdev, WFX_REG_CONFIG, &cfg);
- if (ret < 0)
- goto err;
- ret = write32(wdev, WFX_REG_CONFIG, cfg | prefetch);
- if (ret < 0)
- goto err;
- for (i = 0; i < 20; i++) {
- ret = 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 indirect_write(struct wfx_dev *wdev, int reg, u32 addr,
- const void *buf, size_t len)
- {
- int ret;
- WARN_ON(len >= 0x2000);
- WARN_ON(reg != WFX_REG_AHB_DPORT && reg != WFX_REG_SRAM_DPORT);
- ret = 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 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 = 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 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 = 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 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 = 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 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 = 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((long)buf & 3, "%s: unaligned buffer", __func__);
- 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((long)buf & 3, "%s: unaligned buffer", __func__);
- 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 sram_buf_read(struct wfx_dev *wdev, u32 addr, void *buf, size_t len)
- {
- return indirect_read_locked(wdev, WFX_REG_SRAM_DPORT, addr, buf, len);
- }
- int ahb_buf_read(struct wfx_dev *wdev, u32 addr, void *buf, size_t len)
- {
- return indirect_read_locked(wdev, WFX_REG_AHB_DPORT, addr, buf, len);
- }
- int sram_buf_write(struct wfx_dev *wdev, u32 addr, const void *buf, size_t len)
- {
- return indirect_write_locked(wdev, WFX_REG_SRAM_DPORT, addr, buf, len);
- }
- int ahb_buf_write(struct wfx_dev *wdev, u32 addr, const void *buf, size_t len)
- {
- return indirect_write_locked(wdev, WFX_REG_AHB_DPORT, addr, buf, len);
- }
- int sram_reg_read(struct wfx_dev *wdev, u32 addr, u32 *val)
- {
- return indirect_read32_locked(wdev, WFX_REG_SRAM_DPORT, addr, val);
- }
- int ahb_reg_read(struct wfx_dev *wdev, u32 addr, u32 *val)
- {
- return indirect_read32_locked(wdev, WFX_REG_AHB_DPORT, addr, val);
- }
- int sram_reg_write(struct wfx_dev *wdev, u32 addr, u32 val)
- {
- return indirect_write32_locked(wdev, WFX_REG_SRAM_DPORT, addr, val);
- }
- int ahb_reg_write(struct wfx_dev *wdev, u32 addr, u32 val)
- {
- return indirect_write32_locked(wdev, WFX_REG_AHB_DPORT, addr, val);
- }
- int config_reg_read(struct wfx_dev *wdev, u32 *val)
- {
- return read32_locked(wdev, WFX_REG_CONFIG, val);
- }
- int config_reg_write(struct wfx_dev *wdev, u32 val)
- {
- return write32_locked(wdev, WFX_REG_CONFIG, val);
- }
- int config_reg_write_bits(struct wfx_dev *wdev, u32 mask, u32 val)
- {
- return write32_bits_locked(wdev, WFX_REG_CONFIG, mask, val);
- }
- int control_reg_read(struct wfx_dev *wdev, u32 *val)
- {
- return read32_locked(wdev, WFX_REG_CONTROL, val);
- }
- int control_reg_write(struct wfx_dev *wdev, u32 val)
- {
- return write32_locked(wdev, WFX_REG_CONTROL, val);
- }
- int control_reg_write_bits(struct wfx_dev *wdev, u32 mask, u32 val)
- {
- return write32_bits_locked(wdev, WFX_REG_CONTROL, mask, val);
- }
- int igpr_reg_read(struct wfx_dev *wdev, int index, u32 *val)
- {
- int ret;
- *val = ~0; // Never return undefined value
- ret = write32_locked(wdev, WFX_REG_SET_GEN_R_W, IGPR_RW | index << 24);
- if (ret)
- return ret;
- ret = read32_locked(wdev, WFX_REG_SET_GEN_R_W, val);
- if (ret)
- return ret;
- *val &= IGPR_VALUE;
- return ret;
- }
- int igpr_reg_write(struct wfx_dev *wdev, int index, u32 val)
- {
- return write32_locked(wdev, WFX_REG_SET_GEN_R_W, index << 24 | val);
- }
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