[PATCH 2/2] libertas: implement if_sdio runtime power management
Vasily Khoruzhick
anarsoul at gmail.com
Tue Aug 2 05:04:08 EDT 2011
On Monday 01 August 2011 18:43:27 Daniel Drake wrote:
> The SDIO card is now fully powered down when the network interface is
> brought down.
>
> Signed-off-by: Daniel Drake <dsd at laptop.org>
> ---
> drivers/net/wireless/libertas/if_sdio.c | 277
> +++++++++++++++++++------------ 1 files changed, 171 insertions(+), 106
> deletions(-)
>
> diff --git a/drivers/net/wireless/libertas/if_sdio.c
> b/drivers/net/wireless/libertas/if_sdio.c index 387786e..c962e21 100644
> --- a/drivers/net/wireless/libertas/if_sdio.c
> +++ b/drivers/net/wireless/libertas/if_sdio.c
> @@ -39,6 +39,7 @@
> #include <linux/mmc/sdio_ids.h>
> #include <linux/mmc/sdio.h>
> #include <linux/mmc/host.h>
> +#include <linux/pm_runtime.h>
>
> #include "host.h"
> #include "decl.h"
> @@ -47,6 +48,8 @@
> #include "cmd.h"
> #include "if_sdio.h"
>
> +static void if_sdio_interrupt(struct sdio_func *func);
> +
> /* The if_sdio_remove() callback function is called when
> * user removes this module from kernel space or ejects
> * the card from the slot. The driver handles these 2 cases
> @@ -757,6 +760,136 @@ out:
> return ret;
> }
>
> +/********************************************************************/
> +/* Power management */
> +/********************************************************************/
> +
> +static int if_sdio_power_on(struct if_sdio_card *card)
> +{
> + struct sdio_func *func = card->func;
> + struct lbs_private *priv = card->priv;
> + struct mmc_host *host = func->card->host;
> + int ret;
> +
> + sdio_claim_host(func);
> +
> + ret = sdio_enable_func(func);
> + if (ret)
> + goto release;
> +
> + /* For 1-bit transfers to the 8686 model, we need to enable the
> + * interrupt flag in the CCCR register. Set the MMC_QUIRK_LENIENT_FN0
> + * bit to allow access to non-vendor registers. */
> + if ((card->model == MODEL_8686) &&
> + (host->caps & MMC_CAP_SDIO_IRQ) &&
> + (host->ios.bus_width == MMC_BUS_WIDTH_1)) {
> + u8 reg;
> +
> + func->card->quirks |= MMC_QUIRK_LENIENT_FN0;
> + reg = sdio_f0_readb(func, SDIO_CCCR_IF, &ret);
> + if (ret)
> + goto disable;
> +
> + reg |= SDIO_BUS_ECSI;
> + sdio_f0_writeb(func, reg, SDIO_CCCR_IF, &ret);
> + if (ret)
> + goto disable;
> + }
> +
> + card->ioport = sdio_readb(func, IF_SDIO_IOPORT, &ret);
> + if (ret)
> + goto disable;
> +
> + card->ioport |= sdio_readb(func, IF_SDIO_IOPORT + 1, &ret) << 8;
> + if (ret)
> + goto disable;
> +
> + card->ioport |= sdio_readb(func, IF_SDIO_IOPORT + 2, &ret) << 16;
> + if (ret)
> + goto disable;
> +
> + sdio_release_host(func);
> + ret = if_sdio_prog_firmware(card);
> + sdio_claim_host(func);
> + if (ret)
> + goto disable;
> +
> + /*
> + * Get rx_unit if the chip is SD8688 or newer.
> + * SD8385 & SD8686 do not have rx_unit.
> + */
> + if ((card->model != MODEL_8385)
> + && (card->model != MODEL_8686))
> + card->rx_unit = if_sdio_read_rx_unit(card);
> + else
> + card->rx_unit = 0;
> +
> + /*
> + * Set up the interrupt handler late.
> + *
> + * If we set it up earlier, the (buggy) hardware generates a spurious
> + * interrupt, even before the interrupt has been enabled, with
> + * CCCR_INTx = 0.
> + *
> + * We register the interrupt handler late so that we can handle any
> + * spurious interrupts, and also to avoid generation of that known
> + * spurious interrupt in the first place.
> + */
> + ret = sdio_claim_irq(func, if_sdio_interrupt);
> + if (ret)
> + goto disable;
> +
> + /*
> + * Enable interrupts now that everything is set up
> + */
> + sdio_writeb(func, 0x0f, IF_SDIO_H_INT_MASK, &ret);
> + if (ret)
> + goto release_irq;
> +
> + sdio_release_host(func);
> +
> + /*
> + * FUNC_INIT is required for SD8688 WLAN/BT multiple functions
> + */
> + if (card->model == MODEL_8688) {
> + struct cmd_header cmd;
> +
> + memset(&cmd, 0, sizeof(cmd));
> +
> + lbs_deb_sdio("send function INIT command\n");
> + if (__lbs_cmd(priv, CMD_FUNC_INIT, &cmd, sizeof(cmd),
> + lbs_cmd_copyback, (unsigned long) &cmd))
> + netdev_alert(priv->dev, "CMD_FUNC_INIT cmd failed\n");
> + }
> +
> + priv->fw_ready = 1;
> +
> + return 0;
> +
> +release_irq:
> + sdio_release_irq(func);
> +disable:
> + sdio_disable_func(func);
> +release:
> + sdio_release_host(func);
> + return ret;
> +}
> +
> +static int if_sdio_power_off(struct if_sdio_card *card)
> +{
> + struct sdio_func *func = card->func;
> + struct lbs_private *priv = card->priv;
> +
> + priv->fw_ready = 0;
> +
> + sdio_claim_host(func);
> + sdio_release_irq(func);
> + sdio_disable_func(func);
> + sdio_release_host(func);
> + return 0;
> +}
> +
> +
> /*******************************************************************/
> /* Libertas callbacks */
> /*******************************************************************/
> @@ -923,6 +1056,32 @@ static void if_sdio_reset_card(struct lbs_private
> *priv) schedule_work(&card_reset_work);
> }
>
> +static int if_sdio_power_save(struct lbs_private *priv)
> +{
> + struct if_sdio_card *card = priv->card;
> + int ret;
> +
> + flush_workqueue(card->workqueue);
> +
> + ret = if_sdio_power_off(card);
> +
> + /* Let runtime PM know the card is powered off */
> + pm_runtime_put_sync(&card->func->dev);
> +
> + return ret;
> +}
> +
> +static int if_sdio_power_restore(struct lbs_private *priv)
> +{
> + struct if_sdio_card *card = priv->card;
> +
> + /* Make sure the card will not be powered off by runtime PM */
> + pm_runtime_get_sync(&card->func->dev);
> +
> + return if_sdio_power_on(card);
> +}
> +
> +
> /*******************************************************************/
> /* SDIO callbacks */
> /*******************************************************************/
> @@ -976,7 +1135,6 @@ static int if_sdio_probe(struct sdio_func *func,
> int ret, i;
> unsigned int model;
> struct if_sdio_packet *packet;
> - struct mmc_host *host = func->card->host;
>
> lbs_deb_enter(LBS_DEB_SDIO);
>
> @@ -1033,45 +1191,6 @@ static int if_sdio_probe(struct sdio_func *func,
> goto free;
> }
>
> - sdio_claim_host(func);
> -
> - ret = sdio_enable_func(func);
> - if (ret)
> - goto release;
> -
> - /* For 1-bit transfers to the 8686 model, we need to enable the
> - * interrupt flag in the CCCR register. Set the MMC_QUIRK_LENIENT_FN0
> - * bit to allow access to non-vendor registers. */
> - if ((card->model == MODEL_8686) &&
> - (host->caps & MMC_CAP_SDIO_IRQ) &&
> - (host->ios.bus_width == MMC_BUS_WIDTH_1)) {
> - u8 reg;
> -
> - func->card->quirks |= MMC_QUIRK_LENIENT_FN0;
> - reg = sdio_f0_readb(func, SDIO_CCCR_IF, &ret);
> - if (ret)
> - goto release_int;
> -
> - reg |= SDIO_BUS_ECSI;
> - sdio_f0_writeb(func, reg, SDIO_CCCR_IF, &ret);
> - if (ret)
> - goto release_int;
> - }
> -
> - card->ioport = sdio_readb(func, IF_SDIO_IOPORT, &ret);
> - if (ret)
> - goto release_int;
> -
> - card->ioport |= sdio_readb(func, IF_SDIO_IOPORT + 1, &ret) << 8;
> - if (ret)
> - goto release_int;
> -
> - card->ioport |= sdio_readb(func, IF_SDIO_IOPORT + 2, &ret) << 16;
> - if (ret)
> - goto release_int;
> -
> - sdio_release_host(func);
> -
> sdio_set_drvdata(func, card);
>
> lbs_deb_sdio("class = 0x%X, vendor = 0x%X, "
> @@ -1079,14 +1198,11 @@ static int if_sdio_probe(struct sdio_func *func,
> func->class, func->vendor, func->device,
> model, (unsigned)card->ioport);
>
> - ret = if_sdio_prog_firmware(card);
> - if (ret)
> - goto reclaim;
>
> priv = lbs_add_card(card, &func->dev);
> if (!priv) {
> ret = -ENOMEM;
> - goto reclaim;
> + goto free;
> }
>
> card->priv = priv;
> @@ -1097,62 +1213,21 @@ static int if_sdio_probe(struct sdio_func *func,
> priv->exit_deep_sleep = if_sdio_exit_deep_sleep;
> priv->reset_deep_sleep_wakeup = if_sdio_reset_deep_sleep_wakeup;
> priv->reset_card = if_sdio_reset_card;
> + priv->power_save = if_sdio_power_save;
> + priv->power_restore = if_sdio_power_restore;
>
> - sdio_claim_host(func);
> -
> - /*
> - * Get rx_unit if the chip is SD8688 or newer.
> - * SD8385 & SD8686 do not have rx_unit.
> - */
> - if ((card->model != MODEL_8385)
> - && (card->model != MODEL_8686))
> - card->rx_unit = if_sdio_read_rx_unit(card);
> - else
> - card->rx_unit = 0;
> -
> - /*
> - * Set up the interrupt handler late.
> - *
> - * If we set it up earlier, the (buggy) hardware generates a spurious
> - * interrupt, even before the interrupt has been enabled, with
> - * CCCR_INTx = 0.
> - *
> - * We register the interrupt handler late so that we can handle any
> - * spurious interrupts, and also to avoid generation of that known
> - * spurious interrupt in the first place.
> - */
> - ret = sdio_claim_irq(func, if_sdio_interrupt);
> - if (ret)
> - goto disable;
> -
> - /*
> - * Enable interrupts now that everything is set up
> - */
> - sdio_writeb(func, 0x0f, IF_SDIO_H_INT_MASK, &ret);
> - sdio_release_host(func);
> + ret = if_sdio_power_on(card);
Why do you power on card here? Maybe it's possible do it in lbs_start_card?
> if (ret)
> - goto reclaim;
> -
> - priv->fw_ready = 1;
> -
> - /*
> - * FUNC_INIT is required for SD8688 WLAN/BT multiple functions
> - */
> - if (card->model == MODEL_8688) {
> - struct cmd_header cmd;
> -
> - memset(&cmd, 0, sizeof(cmd));
> -
> - lbs_deb_sdio("send function INIT command\n");
> - if (__lbs_cmd(priv, CMD_FUNC_INIT, &cmd, sizeof(cmd),
> - lbs_cmd_copyback, (unsigned long) &cmd))
> - netdev_alert(priv->dev, "CMD_FUNC_INIT cmd failed\n");
> - }
> + goto err_activate_card;
>
> ret = lbs_start_card(priv);
> + if_sdio_power_off(card);
Same for power off.
> if (ret)
> goto err_activate_card;
>
> + /* Tell PM core that we don't need the card to be powered now */
> + pm_runtime_put_noidle(&func->dev);
> +
> out:
> lbs_deb_leave_args(LBS_DEB_SDIO, "ret %d", ret);
>
> @@ -1161,14 +1236,6 @@ out:
> err_activate_card:
> flush_workqueue(card->workqueue);
> lbs_remove_card(priv);
> -reclaim:
> - sdio_claim_host(func);
> -release_int:
> - sdio_release_irq(func);
> -disable:
> - sdio_disable_func(func);
> -release:
> - sdio_release_host(func);
> free:
> destroy_workqueue(card->workqueue);
> while (card->packets) {
> @@ -1195,6 +1262,9 @@ static void if_sdio_remove(struct sdio_func *func)
>
> card = sdio_get_drvdata(func);
>
> + /* Undo decrement done above in if_sdio_probe */
> + pm_runtime_get_noresume(&func->dev);
> +
> if (user_rmmod && (card->model == MODEL_8688)) {
> /*
> * FUNC_SHUTDOWN is required for SD8688 WLAN/BT
> @@ -1219,11 +1289,6 @@ static void if_sdio_remove(struct sdio_func *func)
> flush_workqueue(card->workqueue);
> destroy_workqueue(card->workqueue);
>
> - sdio_claim_host(func);
> - sdio_release_irq(func);
> - sdio_disable_func(func);
> - sdio_release_host(func);
> -
> while (card->packets) {
> packet = card->packets;
> card->packets = card->packets->next;
Regards
Vasily
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