diff options
author | Jérôme Pouiller <jerome.pouiller@silabs.com> | 2019-09-19 14:25:37 +0000 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-10-04 10:28:16 +0200 |
commit | 0096214a59a72b3c3c943e27bd03307324d3ce0f (patch) | |
tree | 9fda1fc789777965584cb3369cf7651f02d3898d /drivers/staging/wfx/bus_sdio.c | |
parent | a7a91ca5a23dbcc68f04d18ef7e765b1e4f64c7f (diff) |
staging: wfx: add support for I/O access
Introduce bus level communication layer. At this level, 7 registers can
be addressed.
Notice that SPI driver is able to manage chip reset. SDIO mode relies
on an external driver (`mmc-pwrseq`) to reset chip.
Signed-off-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
Link: https://lore.kernel.org/r/20190919142527.31797-3-Jerome.Pouiller@silabs.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/staging/wfx/bus_sdio.c')
-rw-r--r-- | drivers/staging/wfx/bus_sdio.c | 189 |
1 files changed, 188 insertions, 1 deletions
diff --git a/drivers/staging/wfx/bus_sdio.c b/drivers/staging/wfx/bus_sdio.c index 4b26c994f43c..35bcca7ec5dc 100644 --- a/drivers/staging/wfx/bus_sdio.c +++ b/drivers/staging/wfx/bus_sdio.c @@ -8,36 +8,223 @@ #include <linux/module.h> #include <linux/mmc/sdio_func.h> #include <linux/mmc/card.h> +#include <linux/interrupt.h> #include <linux/of_irq.h> #include "bus.h" +#include "wfx.h" +#include "hwio.h" +#include "main.h" + +static const struct wfx_platform_data wfx_sdio_pdata = { +}; + +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; + + BUG_ON(reg_id > 7); + 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; + + BUG_ON(reg_id > 7); + 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) + /* empty */; + 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); + 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; } - return -EIO; // FIXME: not yet supported + + 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; + } + + return 0; + +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_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 |