wl1251: fix ELP_CTRL register accesses when using SDIO

For some unknown reason ELP_CTRL can't be accesed using
sdio_memcpy_* functions (any attemts to do so result in timeouts):

 wl1251: ERROR sdio write failed (-110)
 wl1251: ERROR sdio read failed (-110)
 wl1251: WARNING WLAN not ready

To fix this, add special IO functions for ELP_CTRL access that are
using sdio_readb/sdio_writeb. Similar handling is done in TI
reference driver from Android code drop.

Signed-off-by: Grazvydas Ignotas <notasas@gmail.com>
Cc: Bob Copeland <me@bobcopeland.com>
Acked-by: Kalle Valo <kalle.valo@iki.fi>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 28 insertions, 0 deletions

diff --git a/drivers/net/wireless/wl12xx/wl1251_sdio.c b/drivers/net/wireless/wl12xx/wl1251_sdio.c
index cfca232dc8cb..2051ef06e9ec 100644
--- a/drivers/net/wireless/wl12xx/wl1251_sdio.c
+++ b/drivers/net/wireless/wl12xx/wl1251_sdio.c
@@ -82,6 +82,32 @@ static void wl1251_sdio_write(struct wl1251 *wl, int addr,
         sdio_release_host(func);
 }
 
+static void wl1251_sdio_read_elp(struct wl1251 *wl, int addr, u32 *val)
+{
+        int ret = 0;
+        struct sdio_func *func = wl_to_func(wl);
+
+        sdio_claim_host(func);
+        *val = sdio_readb(func, addr, &ret);
+        sdio_release_host(func);
+
+        if (ret)
+                wl1251_error("sdio_readb failed (%d)", ret);
+}
+
+static void wl1251_sdio_write_elp(struct wl1251 *wl, int addr, u32 val)
+{
+        int ret = 0;
+        struct sdio_func *func = wl_to_func(wl);
+
+        sdio_claim_host(func);
+        sdio_writeb(func, val, addr, &ret);
+        sdio_release_host(func);
+
+        if (ret)
+                wl1251_error("sdio_writeb failed (%d)", ret);
+}
+
 static void wl1251_sdio_reset(struct wl1251 *wl)
 {
 }
@@ -111,6 +137,8 @@ static void wl1251_sdio_set_power(bool enable)
 static const struct wl1251_if_operations wl1251_sdio_ops = {
         .read = wl1251_sdio_read,
         .write = wl1251_sdio_write,
+        .write_elp = wl1251_sdio_write_elp,
+        .read_elp = wl1251_sdio_read_elp,
         .reset = wl1251_sdio_reset,
         .enable_irq = wl1251_sdio_enable_irq,
         .disable_irq = wl1251_sdio_disable_irq,