// SPDX-License-Identifier: GPL-2.0-only /* * SDIO interface. * * Copyright (c) 2017-2019, Silicon Laboratories, Inc. * Copyright (c) 2010, ST-Ericsson */ #include #include #include #include #include #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); if (bus->core) wfx_bh_request_rx(bus->core); else WARN(!bus->core, "race condition in driver init/deinit"); } static irqreturn_t wfx_sdio_irq_handler_ext(int irq, void *priv) { struct wfx_sdio_priv *bus = priv; if (!bus->core) { WARN(!bus->core, "race condition in driver init/deinit"); return IRQ_NONE; } 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(struct wfx_sdio_priv *bus) { int ret; if (bus->of_irq) { ret = request_irq(bus->of_irq, wfx_sdio_irq_handler_ext, IRQF_TRIGGER_RISING, "wfx", bus); } else { sdio_claim_host(bus->func); ret = sdio_claim_irq(bus->func, wfx_sdio_irq_handler); sdio_release_host(bus->func); } return ret; } static int wfx_sdio_irq_unsubscribe(struct wfx_sdio_priv *bus) { int ret; if (bus->of_irq) { free_irq(bus->of_irq, bus); ret = 0; } else { 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, .lock = wfx_sdio_lock, .unlock = wfx_sdio_unlock, .align_size = wfx_sdio_align_size, }; static const struct of_device_id 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; ret = wfx_sdio_irq_subscribe(bus); if (ret) goto err1; bus->core = wfx_init_common(&func->dev, &wfx_sdio_pdata, &wfx_sdio_hwbus_ops, bus); if (!bus->core) { ret = -EIO; goto err2; } ret = wfx_probe(bus->core); if (ret) goto err3; return 0; err3: wfx_free_common(bus->core); err2: wfx_sdio_irq_unsubscribe(bus); 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); wfx_free_common(bus->core); wfx_sdio_irq_unsubscribe(bus); 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); #ifdef CONFIG_OF static const struct of_device_id wfx_sdio_of_match[] = { { .compatible = "silabs,wfx-sdio" }, { }, }; MODULE_DEVICE_TABLE(of, wfx_sdio_of_match); #endif 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 = of_match_ptr(wfx_sdio_of_match), } };