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- // SPDX-License-Identifier: GPL-2.0-only
- /*
- * SDIO interface.
- *
- * Copyright (c) 2017-2020, Silicon Laboratories, Inc.
- * Copyright (c) 2010, ST-Ericsson
- */
- #include <linux/module.h>
- #include <linux/mmc/sdio.h>
- #include <linux/mmc/sdio_func.h>
- #include <linux/mmc/card.h>
- #include <linux/interrupt.h>
- #include <linux/of_irq.h>
- #include <linux/irq.h>
- #include "bus.h"
- #include "wfx.h"
- #include "hwio.h"
- #include "main.h"
- #include "bh.h"
- static const struct wfx_platform_data wfx_sdio_pdata = {
- .file_fw = "wfm_wf200",
- .file_pds = "wf200.pds",
- };
- struct wfx_sdio_priv {
- struct sdio_func *func;
- struct wfx_dev *core;
- u8 buf_id_tx;
- u8 buf_id_rx;
- int of_irq;
- };
- static int wfx_sdio_copy_from_io(void *priv, unsigned int reg_id,
- void *dst, size_t count)
- {
- struct wfx_sdio_priv *bus = priv;
- unsigned int sdio_addr = reg_id << 2;
- int ret;
- WARN(reg_id > 7, "chip only has 7 registers");
- WARN(((uintptr_t)dst) & 3, "unaligned buffer size");
- WARN(count & 3, "unaligned buffer address");
- /* Use queue mode buffers */
- if (reg_id == WFX_REG_IN_OUT_QUEUE)
- sdio_addr |= (bus->buf_id_rx + 1) << 7;
- ret = sdio_memcpy_fromio(bus->func, dst, sdio_addr, count);
- if (!ret && reg_id == WFX_REG_IN_OUT_QUEUE)
- bus->buf_id_rx = (bus->buf_id_rx + 1) % 4;
- return ret;
- }
- static int wfx_sdio_copy_to_io(void *priv, unsigned int reg_id,
- const void *src, size_t count)
- {
- struct wfx_sdio_priv *bus = priv;
- unsigned int sdio_addr = reg_id << 2;
- int ret;
- WARN(reg_id > 7, "chip only has 7 registers");
- WARN(((uintptr_t)src) & 3, "unaligned buffer size");
- WARN(count & 3, "unaligned buffer address");
- /* Use queue mode buffers */
- if (reg_id == WFX_REG_IN_OUT_QUEUE)
- sdio_addr |= bus->buf_id_tx << 7;
- // FIXME: discards 'const' qualifier for src
- ret = sdio_memcpy_toio(bus->func, sdio_addr, (void *)src, count);
- if (!ret && reg_id == WFX_REG_IN_OUT_QUEUE)
- bus->buf_id_tx = (bus->buf_id_tx + 1) % 32;
- return ret;
- }
- static void wfx_sdio_lock(void *priv)
- {
- struct wfx_sdio_priv *bus = priv;
- sdio_claim_host(bus->func);
- }
- static void wfx_sdio_unlock(void *priv)
- {
- struct wfx_sdio_priv *bus = priv;
- sdio_release_host(bus->func);
- }
- static void wfx_sdio_irq_handler(struct sdio_func *func)
- {
- struct wfx_sdio_priv *bus = sdio_get_drvdata(func);
- wfx_bh_request_rx(bus->core);
- }
- static irqreturn_t wfx_sdio_irq_handler_ext(int irq, void *priv)
- {
- struct wfx_sdio_priv *bus = priv;
- sdio_claim_host(bus->func);
- wfx_bh_request_rx(bus->core);
- sdio_release_host(bus->func);
- return IRQ_HANDLED;
- }
- static int wfx_sdio_irq_subscribe(void *priv)
- {
- struct wfx_sdio_priv *bus = priv;
- u32 flags;
- int ret;
- u8 cccr;
- if (!bus->of_irq) {
- sdio_claim_host(bus->func);
- ret = sdio_claim_irq(bus->func, wfx_sdio_irq_handler);
- sdio_release_host(bus->func);
- return ret;
- }
- flags = irq_get_trigger_type(bus->of_irq);
- if (!flags)
- flags = IRQF_TRIGGER_HIGH;
- flags |= IRQF_ONESHOT;
- ret = devm_request_threaded_irq(&bus->func->dev, bus->of_irq, NULL,
- wfx_sdio_irq_handler_ext, flags,
- "wfx", bus);
- if (ret)
- return ret;
- sdio_claim_host(bus->func);
- cccr = sdio_f0_readb(bus->func, SDIO_CCCR_IENx, NULL);
- cccr |= BIT(0);
- cccr |= BIT(bus->func->num);
- sdio_f0_writeb(bus->func, cccr, SDIO_CCCR_IENx, NULL);
- sdio_release_host(bus->func);
- return 0;
- }
- static int wfx_sdio_irq_unsubscribe(void *priv)
- {
- struct wfx_sdio_priv *bus = priv;
- int ret;
- if (bus->of_irq)
- devm_free_irq(&bus->func->dev, bus->of_irq, bus);
- sdio_claim_host(bus->func);
- ret = sdio_release_irq(bus->func);
- sdio_release_host(bus->func);
- return ret;
- }
- static size_t wfx_sdio_align_size(void *priv, size_t size)
- {
- struct wfx_sdio_priv *bus = priv;
- return sdio_align_size(bus->func, size);
- }
- static const struct hwbus_ops wfx_sdio_hwbus_ops = {
- .copy_from_io = wfx_sdio_copy_from_io,
- .copy_to_io = wfx_sdio_copy_to_io,
- .irq_subscribe = wfx_sdio_irq_subscribe,
- .irq_unsubscribe = wfx_sdio_irq_unsubscribe,
- .lock = wfx_sdio_lock,
- .unlock = wfx_sdio_unlock,
- .align_size = wfx_sdio_align_size,
- };
- static const struct of_device_id wfx_sdio_of_match[] = {
- { .compatible = "silabs,wfx-sdio" },
- { .compatible = "silabs,wf200" },
- { },
- };
- MODULE_DEVICE_TABLE(of, wfx_sdio_of_match);
- static int wfx_sdio_probe(struct sdio_func *func,
- const struct sdio_device_id *id)
- {
- struct device_node *np = func->dev.of_node;
- struct wfx_sdio_priv *bus;
- int ret;
- if (func->num != 1) {
- dev_err(&func->dev, "SDIO function number is %d while it should always be 1 (unsupported chip?)\n",
- func->num);
- return -ENODEV;
- }
- bus = devm_kzalloc(&func->dev, sizeof(*bus), GFP_KERNEL);
- if (!bus)
- return -ENOMEM;
- if (np) {
- if (!of_match_node(wfx_sdio_of_match, np)) {
- dev_warn(&func->dev, "no compatible device found in DT\n");
- return -ENODEV;
- }
- bus->of_irq = irq_of_parse_and_map(np, 0);
- } else {
- dev_warn(&func->dev,
- "device is not declared in DT, features will be limited\n");
- // FIXME: ignore VID/PID and only rely on device tree
- // return -ENODEV;
- }
- bus->func = func;
- sdio_set_drvdata(func, bus);
- func->card->quirks |= MMC_QUIRK_LENIENT_FN0 |
- MMC_QUIRK_BLKSZ_FOR_BYTE_MODE |
- MMC_QUIRK_BROKEN_BYTE_MODE_512;
- sdio_claim_host(func);
- ret = sdio_enable_func(func);
- // Block of 64 bytes is more efficient than 512B for frame sizes < 4k
- sdio_set_block_size(func, 64);
- sdio_release_host(func);
- if (ret)
- goto err0;
- bus->core = wfx_init_common(&func->dev, &wfx_sdio_pdata,
- &wfx_sdio_hwbus_ops, bus);
- if (!bus->core) {
- ret = -EIO;
- goto err1;
- }
- ret = wfx_probe(bus->core);
- if (ret)
- goto err1;
- return 0;
- err1:
- sdio_claim_host(func);
- sdio_disable_func(func);
- sdio_release_host(func);
- err0:
- return ret;
- }
- static void wfx_sdio_remove(struct sdio_func *func)
- {
- struct wfx_sdio_priv *bus = sdio_get_drvdata(func);
- wfx_release(bus->core);
- sdio_claim_host(func);
- sdio_disable_func(func);
- sdio_release_host(func);
- }
- #define SDIO_VENDOR_ID_SILABS 0x0000
- #define SDIO_DEVICE_ID_SILABS_WF200 0x1000
- static const struct sdio_device_id wfx_sdio_ids[] = {
- { SDIO_DEVICE(SDIO_VENDOR_ID_SILABS, SDIO_DEVICE_ID_SILABS_WF200) },
- // FIXME: ignore VID/PID and only rely on device tree
- // { SDIO_DEVICE(SDIO_ANY_ID, SDIO_ANY_ID) },
- { },
- };
- MODULE_DEVICE_TABLE(sdio, wfx_sdio_ids);
- struct sdio_driver wfx_sdio_driver = {
- .name = "wfx-sdio",
- .id_table = wfx_sdio_ids,
- .probe = wfx_sdio_probe,
- .remove = wfx_sdio_remove,
- .drv = {
- .owner = THIS_MODULE,
- .of_match_table = wfx_sdio_of_match,
- }
- };
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