MMC: OMAP: Introduce new multislot structure and change driver to use it
Introduce new MMC multislot structure and change driver to use it. Note that MMC clocking is now enabled in mmc_omap_select_slot() and disabled in mmc_omap_release_slot(). Signed-off-by: Juha Yrjola <juha.yrjola@solidboot.com> Signed-off-by: Jarkko Lavinen <jarkko.lavinen@nokia.com> Signed-off-by: Carlos Eduardo Aguiar <carlos.aguiar@indt.org.br> Signed-off-by: Tony Lindgren <tony@atomide.com> Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
This commit is contained in:
Juha Yrjola
Pierre Ossman
Родитель
4bc9e35556
Коммит
abfbe5f785
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@ -32,6 +32,7 @@
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#include <asm/mach-types.h>
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#include <asm/arch/board.h>
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#include <asm/arch/mmc.h>
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#include <asm/arch/gpio.h>
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#include <asm/arch/dma.h>
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#include <asm/arch/mux.h>
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@ -95,6 +96,22 @@
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* when the cover switch is open */
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#define OMAP_MMC_SWITCH_POLL_DELAY 500
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struct mmc_omap_host;
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struct mmc_omap_slot {
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int id;
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unsigned int vdd;
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u16 saved_con;
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u16 bus_mode;
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unsigned int fclk_freq;
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unsigned powered:1;
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struct mmc_request *mrq;
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struct mmc_omap_host *host;
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struct mmc_host *mmc;
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struct omap_mmc_slot_data *pdata;
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};
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struct mmc_omap_host {
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int initialized;
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int suspended;
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@ -129,13 +146,98 @@ struct mmc_omap_host {
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unsigned dma_len;
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short power_pin;
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short wp_pin;
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struct work_struct switch_work;
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struct timer_list switch_timer;
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int switch_last_state;
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struct mmc_omap_slot *slots[OMAP_MMC_MAX_SLOTS];
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struct mmc_omap_slot *current_slot;
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spinlock_t slot_lock;
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wait_queue_head_t slot_wq;
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int nr_slots;
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struct omap_mmc_platform_data *pdata;
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};
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static void mmc_omap_select_slot(struct mmc_omap_slot *slot, int claimed)
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{
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struct mmc_omap_host *host = slot->host;
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unsigned long flags;
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if (claimed)
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goto no_claim;
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spin_lock_irqsave(&host->slot_lock, flags);
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while (host->mmc != NULL) {
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spin_unlock_irqrestore(&host->slot_lock, flags);
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wait_event(host->slot_wq, host->mmc == NULL);
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spin_lock_irqsave(&host->slot_lock, flags);
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}
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host->mmc = slot->mmc;
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spin_unlock_irqrestore(&host->slot_lock, flags);
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no_claim:
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clk_enable(host->fclk);
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if (host->current_slot != slot) {
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if (host->pdata->switch_slot != NULL)
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host->pdata->switch_slot(mmc_dev(slot->mmc), slot->id);
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host->current_slot = slot;
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}
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/* Doing the dummy read here seems to work around some bug
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* at least in OMAP24xx silicon where the command would not
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* start after writing the CMD register. Sigh. */
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OMAP_MMC_READ(host, CON);
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OMAP_MMC_WRITE(host, CON, slot->saved_con);
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}
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static void mmc_omap_start_request(struct mmc_omap_host *host,
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struct mmc_request *req);
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static void mmc_omap_release_slot(struct mmc_omap_slot *slot)
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{
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struct mmc_omap_host *host = slot->host;
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unsigned long flags;
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int i;
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BUG_ON(slot == NULL || host->mmc == NULL);
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clk_disable(host->fclk);
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spin_lock_irqsave(&host->slot_lock, flags);
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/* Check for any pending requests */
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for (i = 0; i < host->nr_slots; i++) {
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struct mmc_omap_slot *new_slot;
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struct mmc_request *rq;
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if (host->slots[i] == NULL || host->slots[i]->mrq == NULL)
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continue;
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new_slot = host->slots[i];
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/* The current slot should not have a request in queue */
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BUG_ON(new_slot == host->current_slot);
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host->mmc = new_slot->mmc;
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spin_unlock_irqrestore(&host->slot_lock, flags);
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mmc_omap_select_slot(new_slot, 1);
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rq = new_slot->mrq;
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new_slot->mrq = NULL;
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mmc_omap_start_request(host, rq);
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return;
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}
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host->mmc = NULL;
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wake_up(&host->slot_wq);
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spin_unlock_irqrestore(&host->slot_lock, flags);
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}
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static ssize_t
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mmc_omap_show_slot_name(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct mmc_host *mmc = container_of(dev, struct mmc_host, class_dev);
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struct mmc_omap_slot *slot = mmc_priv(mmc);
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return sprintf(buf, "%s\n", slot->pdata->name);
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}
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static DEVICE_ATTR(slot_name, S_IRUGO, mmc_omap_show_slot_name, NULL);
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static void
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mmc_omap_start_command(struct mmc_omap_host *host, struct mmc_command *cmd)
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{
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@ -180,7 +282,7 @@ mmc_omap_start_command(struct mmc_omap_host *host, struct mmc_command *cmd)
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cmdreg = cmd->opcode | (resptype << 8) | (cmdtype << 12);
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if (host->bus_mode == MMC_BUSMODE_OPENDRAIN)
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if (host->current_slot->bus_mode == MMC_BUSMODE_OPENDRAIN)
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cmdreg |= 1 << 6;
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if (cmd->flags & MMC_RSP_BUSY)
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@ -189,8 +291,6 @@ mmc_omap_start_command(struct mmc_omap_host *host, struct mmc_command *cmd)
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if (host->data && !(host->data->flags & MMC_DATA_WRITE))
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cmdreg |= 1 << 15;
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clk_enable(host->fclk);
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OMAP_MMC_WRITE(host, CTO, 200);
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OMAP_MMC_WRITE(host, ARGL, cmd->arg & 0xffff);
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OMAP_MMC_WRITE(host, ARGH, cmd->arg >> 16);
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@ -442,6 +542,8 @@ static irqreturn_t mmc_omap_irq(int irq, void *dev_id)
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if (status & OMAP_MMC_STAT_CMD_TOUT) {
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/* Timeouts are routine with some commands */
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if (host->cmd) {
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struct mmc_omap_slot *slot =
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host->current_slot;
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dev_err(mmc_dev(host->mmc),
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"command timeout, CMD %d\n",
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host->cmd->opcode);
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@ -747,11 +849,10 @@ mmc_omap_prepare_data(struct mmc_omap_host *host, struct mmc_request *req)
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}
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}
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static void mmc_omap_request(struct mmc_host *mmc, struct mmc_request *req)
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static void mmc_omap_start_request(struct mmc_omap_host *host,
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struct mmc_request *req)
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{
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struct mmc_omap_host *host = mmc_priv(mmc);
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WARN_ON(host->mrq != NULL);
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BUG_ON(host->mrq != NULL);
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host->mrq = req;
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@ -760,6 +861,26 @@ static void mmc_omap_request(struct mmc_host *mmc, struct mmc_request *req)
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mmc_omap_start_command(host, req->cmd);
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if (host->dma_in_use)
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omap_start_dma(host->dma_ch);
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BUG_ON(irqs_disabled());
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}
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static void mmc_omap_request(struct mmc_host *mmc, struct mmc_request *req)
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{
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struct mmc_omap_slot *slot = mmc_priv(mmc);
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struct mmc_omap_host *host = slot->host;
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unsigned long flags;
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spin_lock_irqsave(&host->slot_lock, flags);
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if (host->mmc != NULL) {
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BUG_ON(slot->mrq != NULL);
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slot->mrq = req;
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spin_unlock_irqrestore(&host->slot_lock, flags);
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return;
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} else
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host->mmc = mmc;
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spin_unlock_irqrestore(&host->slot_lock, flags);
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mmc_omap_select_slot(slot, 1);
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mmc_omap_start_request(host, req);
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}
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static void innovator_fpga_socket_power(int on)
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@ -813,7 +934,8 @@ static void mmc_omap_power(struct mmc_omap_host *host, int on)
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static int mmc_omap_calc_divisor(struct mmc_host *mmc, struct mmc_ios *ios)
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{
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struct mmc_omap_host *host = mmc_priv(mmc);
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struct mmc_omap_slot *slot = mmc_priv(mmc);
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struct mmc_omap_host *host = slot->host;
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int func_clk_rate = clk_get_rate(host->fclk);
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int dsor;
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@ -830,6 +952,8 @@ static int mmc_omap_calc_divisor(struct mmc_host *mmc, struct mmc_ios *ios)
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if (dsor > 250)
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dsor = 250;
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slot->fclk_freq = func_clk_rate / dsor;
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if (ios->bus_width == MMC_BUS_WIDTH_4)
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dsor |= 1 << 15;
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@ -838,9 +962,9 @@ static int mmc_omap_calc_divisor(struct mmc_host *mmc, struct mmc_ios *ios)
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static void mmc_omap_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
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{
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struct mmc_omap_host *host = mmc_priv(mmc);
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int dsor;
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int i;
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struct mmc_omap_slot *slot = mmc_priv(mmc);
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struct mmc_omap_host *host = slot->host;
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int i, dsor;
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dsor = mmc_omap_calc_divisor(mmc, ios);
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host->bus_mode = ios->bus_mode;
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@ -878,32 +1002,101 @@ static void mmc_omap_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
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clk_disable(host->fclk);
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}
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static int mmc_omap_get_ro(struct mmc_host *mmc)
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{
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struct mmc_omap_host *host = mmc_priv(mmc);
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return host->wp_pin && omap_get_gpio_datain(host->wp_pin);
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}
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static const struct mmc_host_ops mmc_omap_ops = {
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.request = mmc_omap_request,
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.set_ios = mmc_omap_set_ios,
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.get_ro = mmc_omap_get_ro,
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};
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static int __init mmc_omap_new_slot(struct mmc_omap_host *host, int id)
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{
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struct mmc_omap_slot *slot = NULL;
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struct mmc_host *mmc;
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int r;
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mmc = mmc_alloc_host(sizeof(struct mmc_omap_slot), host->dev);
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if (mmc == NULL)
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return -ENOMEM;
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slot = mmc_priv(mmc);
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slot->host = host;
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slot->mmc = mmc;
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slot->id = id;
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slot->pdata = &host->pdata->slots[id];
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host->slots[id] = slot;
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mmc->caps = MMC_CAP_MULTIWRITE;
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if (host->pdata->conf.wire4)
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mmc->caps |= MMC_CAP_4_BIT_DATA;
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mmc->ops = &mmc_omap_ops;
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mmc->f_min = 400000;
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if (cpu_class_is_omap2())
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mmc->f_max = 48000000;
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else
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mmc->f_max = 24000000;
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if (host->pdata->max_freq)
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mmc->f_max = min(host->pdata->max_freq, mmc->f_max);
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mmc->ocr_avail = slot->pdata->ocr_mask;
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/* Use scatterlist DMA to reduce per-transfer costs.
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* NOTE max_seg_size assumption that small blocks aren't
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* normally used (except e.g. for reading SD registers).
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*/
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mmc->max_phys_segs = 32;
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mmc->max_hw_segs = 32;
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mmc->max_blk_size = 2048; /* BLEN is 11 bits (+1) */
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mmc->max_blk_count = 2048; /* NBLK is 11 bits (+1) */
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mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
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mmc->max_seg_size = mmc->max_req_size;
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r = mmc_add_host(mmc);
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if (r < 0)
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goto err_remove_host;
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if (slot->pdata->name != NULL) {
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r = device_create_file(&mmc->class_dev,
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&dev_attr_slot_name);
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if (r < 0)
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goto err_remove_host;
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}
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return 0;
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err_remove_host:
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mmc_remove_host(mmc);
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mmc_free_host(mmc);
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return r;
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}
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static void mmc_omap_remove_slot(struct mmc_omap_slot *slot)
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{
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struct mmc_host *mmc = slot->mmc;
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if (slot->pdata->name != NULL)
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device_remove_file(&mmc->class_dev, &dev_attr_slot_name);
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mmc_remove_host(mmc);
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mmc_free_host(mmc);
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}
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static int __init mmc_omap_probe(struct platform_device *pdev)
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{
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struct omap_mmc_conf *minfo = pdev->dev.platform_data;
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struct mmc_host *mmc;
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struct omap_mmc_platform_data *pdata = pdev->dev.platform_data;
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struct mmc_omap_host *host = NULL;
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struct resource *res;
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int ret = 0;
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int i, ret = 0;
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int irq;
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if (minfo == NULL) {
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if (pdata == NULL) {
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dev_err(&pdev->dev, "platform data missing\n");
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return -ENXIO;
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}
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if (pdata->nr_slots == 0) {
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dev_err(&pdev->dev, "no slots\n");
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return -ENXIO;
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}
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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irq = platform_get_irq(pdev, 0);
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@ -911,28 +1104,39 @@ static int __init mmc_omap_probe(struct platform_device *pdev)
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return -ENXIO;
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res = request_mem_region(res->start, res->end - res->start + 1,
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pdev->name);
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pdev->name);
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if (res == NULL)
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return -EBUSY;
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mmc = mmc_alloc_host(sizeof(struct mmc_omap_host), &pdev->dev);
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if (mmc == NULL) {
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host = kzalloc(sizeof(struct mmc_omap_host), GFP_KERNEL);
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if (host == NULL) {
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ret = -ENOMEM;
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goto err_free_mem_region;
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}
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host = mmc_priv(mmc);
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host->mmc = mmc;
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spin_lock_init(&host->dma_lock);
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init_timer(&host->dma_timer);
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spin_lock_init(&host->slot_lock);
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init_waitqueue_head(&host->slot_wq);
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host->dma_timer.function = mmc_omap_dma_timer;
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host->dma_timer.data = (unsigned long) host;
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host->pdata = pdata;
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host->dev = &pdev->dev;
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platform_set_drvdata(pdev, host);
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host->id = pdev->id;
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host->mem_res = res;
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host->irq = irq;
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host->use_dma = 1;
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host->dma_ch = -1;
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host->irq = irq;
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host->phys_base = host->mem_res->start;
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host->virt_base = (void __iomem *) IO_ADDRESS(host->phys_base);
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if (cpu_is_omap24xx()) {
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host->iclk = clk_get(&pdev->dev, "mmc_ick");
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if (IS_ERR(host->iclk))
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@ -950,70 +1154,34 @@ static int __init mmc_omap_probe(struct platform_device *pdev)
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goto err_free_iclk;
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}
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/* REVISIT:
|
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* Also, use minfo->cover to decide how to manage
|
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* the card detect sensing.
|
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*/
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host->power_pin = minfo->power_pin;
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host->wp_pin = minfo->wp_pin;
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host->use_dma = 1;
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host->dma_ch = -1;
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host->irq = irq;
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host->phys_base = host->mem_res->start;
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host->virt_base = (void __iomem *) IO_ADDRESS(host->phys_base);
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|
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mmc->ops = &mmc_omap_ops;
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mmc->f_min = 400000;
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mmc->f_max = 24000000;
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mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
|
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mmc->caps = MMC_CAP_MULTIWRITE;
|
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|
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if (minfo->wire4)
|
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mmc->caps |= MMC_CAP_4_BIT_DATA;
|
||||
|
||||
/* Use scatterlist DMA to reduce per-transfer costs.
|
||||
* NOTE max_seg_size assumption that small blocks aren't
|
||||
* normally used (except e.g. for reading SD registers).
|
||||
*/
|
||||
mmc->max_phys_segs = 32;
|
||||
mmc->max_hw_segs = 32;
|
||||
mmc->max_blk_size = 2048; /* BLEN is 11 bits (+1) */
|
||||
mmc->max_blk_count = 2048; /* NBLK is 11 bits (+1) */
|
||||
mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
|
||||
mmc->max_seg_size = mmc->max_req_size;
|
||||
|
||||
if (host->power_pin >= 0) {
|
||||
if ((ret = omap_request_gpio(host->power_pin)) != 0) {
|
||||
dev_err(mmc_dev(host->mmc),
|
||||
"Unable to get GPIO pin for MMC power\n");
|
||||
goto err_free_fclk;
|
||||
}
|
||||
omap_set_gpio_direction(host->power_pin, 0);
|
||||
}
|
||||
|
||||
ret = request_irq(host->irq, mmc_omap_irq, 0, DRIVER_NAME, host);
|
||||
if (ret)
|
||||
goto err_free_power_gpio;
|
||||
goto err_free_fclk;
|
||||
|
||||
host->dev = &pdev->dev;
|
||||
platform_set_drvdata(pdev, host);
|
||||
if (pdata->init != NULL) {
|
||||
ret = pdata->init(&pdev->dev);
|
||||
if (ret < 0)
|
||||
goto err_free_irq;
|
||||
}
|
||||
|
||||
mmc_add_host(mmc);
|
||||
host->nr_slots = pdata->nr_slots;
|
||||
for (i = 0; i < pdata->nr_slots; i++) {
|
||||
ret = mmc_omap_new_slot(host, i);
|
||||
if (ret < 0) {
|
||||
while (--i >= 0)
|
||||
mmc_omap_remove_slot(host->slots[i]);
|
||||
|
||||
goto err_plat_cleanup;
|
||||
}
|
||||
}
|
||||
|
||||
return 0;
|
||||
|
||||
/* FIXME: Free other resources too. */
|
||||
if (host) {
|
||||
if (host->iclk && !IS_ERR(host->iclk))
|
||||
clk_put(host->iclk);
|
||||
if (host->fclk && !IS_ERR(host->fclk))
|
||||
clk_put(host->fclk);
|
||||
mmc_free_host(host->mmc);
|
||||
}
|
||||
err_free_power_gpio:
|
||||
if (host->power_pin >= 0)
|
||||
omap_free_gpio(host->power_pin);
|
||||
err_plat_cleanup:
|
||||
if (pdata->cleanup)
|
||||
pdata->cleanup(&pdev->dev);
|
||||
err_free_irq:
|
||||
free_irq(host->irq, host);
|
||||
err_free_fclk:
|
||||
clk_put(host->fclk);
|
||||
err_free_iclk:
|
||||
|
|
@ -1022,7 +1190,7 @@ err_free_iclk:
|
|||
clk_put(host->iclk);
|
||||
}
|
||||
err_free_mmc_host:
|
||||
mmc_free_host(host->mmc);
|
||||
kfree(host);
|
||||
err_free_mem_region:
|
||||
release_mem_region(res->start, res->end - res->start + 1);
|
||||
return ret;
|
||||
|
|
@ -1031,16 +1199,18 @@ err_free_mem_region:
|
|||
static int mmc_omap_remove(struct platform_device *pdev)
|
||||
{
|
||||
struct mmc_omap_host *host = platform_get_drvdata(pdev);
|
||||
int i;
|
||||
|
||||
platform_set_drvdata(pdev, NULL);
|
||||
|
||||
BUG_ON(host == NULL);
|
||||
|
||||
mmc_remove_host(host->mmc);
|
||||
free_irq(host->irq, host);
|
||||
for (i = 0; i < host->nr_slots; i++)
|
||||
mmc_omap_remove_slot(host->slots[i]);
|
||||
|
||||
if (host->pdata->cleanup)
|
||||
host->pdata->cleanup(&pdev->dev);
|
||||
|
||||
if (host->power_pin >= 0)
|
||||
omap_free_gpio(host->power_pin);
|
||||
if (host->iclk && !IS_ERR(host->iclk))
|
||||
clk_put(host->iclk);
|
||||
if (host->fclk && !IS_ERR(host->fclk))
|
||||
|
|
@ -1049,7 +1219,7 @@ static int mmc_omap_remove(struct platform_device *pdev)
|
|||
release_mem_region(pdev->resource[0].start,
|
||||
pdev->resource[0].end - pdev->resource[0].start + 1);
|
||||
|
||||
mmc_free_host(host->mmc);
|
||||
kfree(host);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
|
@ -1057,35 +1227,47 @@ static int mmc_omap_remove(struct platform_device *pdev)
|
|||
#ifdef CONFIG_PM
|
||||
static int mmc_omap_suspend(struct platform_device *pdev, pm_message_t mesg)
|
||||
{
|
||||
int ret = 0;
|
||||
int i, ret = 0;
|
||||
struct mmc_omap_host *host = platform_get_drvdata(pdev);
|
||||
|
||||
if (host && host->suspended)
|
||||
if (host == NULL || host->suspended)
|
||||
return 0;
|
||||
|
||||
if (host) {
|
||||
ret = mmc_suspend_host(host->mmc, mesg);
|
||||
if (ret == 0)
|
||||
host->suspended = 1;
|
||||
for (i = 0; i < host->nr_slots; i++) {
|
||||
struct mmc_omap_slot *slot;
|
||||
|
||||
slot = host->slots[i];
|
||||
ret = mmc_suspend_host(slot->mmc, mesg);
|
||||
if (ret < 0) {
|
||||
while (--i >= 0) {
|
||||
slot = host->slots[i];
|
||||
mmc_resume_host(slot->mmc);
|
||||
}
|
||||
return ret;
|
||||
}
|
||||
}
|
||||
return ret;
|
||||
host->suspended = 1;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int mmc_omap_resume(struct platform_device *pdev)
|
||||
{
|
||||
int ret = 0;
|
||||
int i, ret = 0;
|
||||
struct mmc_omap_host *host = platform_get_drvdata(pdev);
|
||||
|
||||
if (host && !host->suspended)
|
||||
if (host == NULL || !host->suspended)
|
||||
return 0;
|
||||
|
||||
if (host) {
|
||||
ret = mmc_resume_host(host->mmc);
|
||||
if (ret == 0)
|
||||
host->suspended = 0;
|
||||
}
|
||||
for (i = 0; i < host->nr_slots; i++) {
|
||||
struct mmc_omap_slot *slot;
|
||||
slot = host->slots[i];
|
||||
ret = mmc_resume_host(slot->mmc);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
return ret;
|
||||
host->suspended = 0;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
#else
|
||||
#define mmc_omap_suspend NULL
|
||||
|
|
|
|||
|
|
@ -18,6 +18,8 @@
|
|||
#define OMAP_MMC_MAX_SLOTS 2
|
||||
|
||||
struct omap_mmc_platform_data {
|
||||
struct omap_mmc_conf conf;
|
||||
|
||||
unsigned enabled:1;
|
||||
/* number of slots on board */
|
||||
unsigned nr_slots:2;
|
||||
|
|
|
|||
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