From: Jérôme Pouiller <jerome.pouil...@silabs.com>

Signed-off-by: Jérôme Pouiller <jerome.pouil...@silabs.com>
---
 drivers/net/wireless/silabs/wfx/bus_sdio.c | 259 +++++++++++++++++++++
 1 file changed, 259 insertions(+)
 create mode 100644 drivers/net/wireless/silabs/wfx/bus_sdio.c

diff --git a/drivers/net/wireless/silabs/wfx/bus_sdio.c 
b/drivers/net/wireless/silabs/wfx/bus_sdio.c
new file mode 100644
index 000000000000..55b6728416ba
--- /dev/null
+++ b/drivers/net/wireless/silabs/wfx/bus_sdio.c
@@ -0,0 +1,259 @@
+// 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/sdio_ids.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;
+       }
+
+       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);
+       flags = irq_get_trigger_type(bus->of_irq);
+       if (!flags)
+               flags = IRQF_TRIGGER_HIGH;
+       flags |= IRQF_ONESHOT;
+       return devm_request_threaded_irq(&bus->func->dev, bus->of_irq, NULL,
+                                        wfx_sdio_irq_handler_ext, flags,
+                                        "wfx", bus);
+}
+
+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 || !of_match_node(wfx_sdio_of_match, np)) {
+               dev_warn(&func->dev, "no compatible device found in DT\n");
+               return -ENODEV;
+       }
+
+       bus->func = func;
+       bus->of_irq = irq_of_parse_and_map(np, 0);
+       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);
+}
+
+static const struct sdio_device_id wfx_sdio_ids[] = {
+       { SDIO_DEVICE(SDIO_VENDOR_ID_SILABS, SDIO_DEVICE_ID_SILABS_WF200) },
+       { },
+};
+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,
+       }
+};
-- 
2.30.2

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