[PATCH 05/18] MMC: OMAP: Introduce new multislot structure and changedriver to use it

From: Carlos Aguiar
Date: Mon Jan 28 2008 - 14:12:04 EST

From: Juha Yrjola <juha.yrjola@xxxxxxxxxxxxx>

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@xxxxxxxxxxxxx>
Signed-off-by: Jarkko Lavinen <jarkko.lavinen@xxxxxxxxx>
Signed-off-by: Carlos Eduardo Aguiar <carlos.aguiar@xxxxxxxxxxx>
Signed-off-by: Tony Lindgren <tony@xxxxxxxxxxx>
---
drivers/mmc/host/omap.c | 424 +++++++++++++++++++++++++++++----------
include/asm-arm/arch-omap/mmc.h | 2 +
2 files changed, 322 insertions(+), 104 deletions(-)

diff --git a/drivers/mmc/host/omap.c b/drivers/mmc/host/omap.c
index 721955a..35719e7 100644
--- a/drivers/mmc/host/omap.c
+++ b/drivers/mmc/host/omap.c
@@ -33,6 +33,7 @@
#include <asm/mach-types.h>

#include <asm/arch/board.h>
+#include <asm/arch/mmc.h>
#include <asm/arch/gpio.h>
#include <asm/arch/dma.h>
#include <asm/arch/mux.h>
@@ -96,6 +97,22 @@
* when the cover switch is open */
#define OMAP_MMC_SWITCH_POLL_DELAY 500

+struct mmc_omap_host;
+
+struct mmc_omap_slot {
+ int id;
+ unsigned int vdd;
+ u16 saved_con;
+ u16 bus_mode;
+ unsigned int fclk_freq;
+ unsigned powered:1;
+
+ struct mmc_request *mrq;
+ struct mmc_omap_host *host;
+ struct mmc_host *mmc;
+ struct omap_mmc_slot_data *pdata;
+};
+
struct mmc_omap_host {
int initialized;
int suspended;
@@ -130,13 +147,112 @@ struct mmc_omap_host {
unsigned dma_len;

short power_pin;
- short wp_pin;

- struct work_struct switch_work;
- struct timer_list switch_timer;
- int switch_last_state;
+ struct mmc_omap_slot *slots[OMAP_MMC_MAX_SLOTS];
+ struct mmc_omap_slot *current_slot;
+ spinlock_t slot_lock;
+ wait_queue_head_t slot_wq;
+ int nr_slots;
+
+ struct omap_mmc_platform_data *pdata;
};

+static void mmc_omap_select_slot(struct mmc_omap_slot *slot, int claimed)
+{
+ struct mmc_omap_host *host = slot->host;
+ unsigned long flags;
+
+ if (claimed)
+ goto no_claim;
+ spin_lock_irqsave(&host->slot_lock, flags);
+ while (host->mmc != NULL) {
+ spin_unlock_irqrestore(&host->slot_lock, flags);
+ wait_event(host->slot_wq, host->mmc == NULL);
+ spin_lock_irqsave(&host->slot_lock, flags);
+ }
+ host->mmc = slot->mmc;
+ spin_unlock_irqrestore(&host->slot_lock, flags);
+no_claim:
+ clk_enable(host->fclk);
+ if (host->current_slot != slot) {
+ if (host->pdata->switch_slot != NULL)
+ host->pdata->switch_slot(mmc_dev(slot->mmc), slot->id);
+ host->current_slot = slot;
+ }
+
+ /* Doing the dummy read here seems to work around some bug
+ * at least in OMAP24xx silicon where the command would not
+ * start after writing the CMD register. Sigh. */
+ OMAP_MMC_READ(host, CON);
+
+ OMAP_MMC_WRITE(host, CON, slot->saved_con);
+}
+
+static void mmc_omap_start_request(struct mmc_omap_host *host,
+ struct mmc_request *req);
+
+static void mmc_omap_release_slot(struct mmc_omap_slot *slot)
+{
+ struct mmc_omap_host *host = slot->host;
+ unsigned long flags;
+ int i;
+
+ BUG_ON(slot == NULL || host->mmc == NULL);
+ clk_disable(host->fclk);
+
+ spin_lock_irqsave(&host->slot_lock, flags);
+ /* Check for any pending requests */
+ for (i = 0; i < host->nr_slots; i++) {
+ struct mmc_omap_slot *new_slot;
+ struct mmc_request *rq;
+
+ if (host->slots[i] == NULL || host->slots[i]->mrq == NULL)
+ continue;
+
+ new_slot = host->slots[i];
+ /* The current slot should not have a request in queue */
+ BUG_ON(new_slot == host->current_slot);
+
+ host->mmc = new_slot->mmc;
+ spin_unlock_irqrestore(&host->slot_lock, flags);
+ mmc_omap_select_slot(new_slot, 1);
+ rq = new_slot->mrq;
+ new_slot->mrq = NULL;
+ mmc_omap_start_request(host, rq);
+ return;
+ }
+
+ host->mmc = NULL;
+ wake_up(&host->slot_wq);
+ spin_unlock_irqrestore(&host->slot_lock, flags);
+}
+
+/* Access to the R/O switch is required for production testing
+ * purposes. */
+static ssize_t
+mmc_omap_show_ro(struct device *dev, struct device_attribute *attr, char *buf)
+{
+ struct mmc_host *mmc = container_of(dev, struct mmc_host, class_dev);
+ struct mmc_omap_slot *slot = mmc_priv(mmc);
+
+ return sprintf(buf, "%d\n", slot->pdata->get_ro(mmc_dev(mmc),
+ slot->id));
+}
+
+static DEVICE_ATTR(ro, S_IRUGO, mmc_omap_show_ro, NULL);
+
+static ssize_t
+mmc_omap_show_slot_name(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct mmc_host *mmc = container_of(dev, struct mmc_host, class_dev);
+ struct mmc_omap_slot *slot = mmc_priv(mmc);
+
+ return sprintf(buf, "%s\n", slot->pdata->name);
+}
+
+static DEVICE_ATTR(slot_name, S_IRUGO, mmc_omap_show_slot_name, NULL);
+
static void
mmc_omap_start_command(struct mmc_omap_host *host, struct mmc_command *cmd)
{
@@ -181,7 +297,7 @@ mmc_omap_start_command(struct mmc_omap_host *host, struct mmc_command *cmd)

cmdreg = cmd->opcode | (resptype << 8) | (cmdtype << 12);

- if (host->bus_mode == MMC_BUSMODE_OPENDRAIN)
+ if (host->current_slot->bus_mode == MMC_BUSMODE_OPENDRAIN)
cmdreg |= 1 << 6;

if (cmd->flags & MMC_RSP_BUSY)
@@ -190,8 +306,6 @@ mmc_omap_start_command(struct mmc_omap_host *host, struct mmc_command *cmd)
if (host->data && !(host->data->flags & MMC_DATA_WRITE))
cmdreg |= 1 << 15;

- clk_enable(host->fclk);
-
OMAP_MMC_WRITE(host, CTO, 200);
OMAP_MMC_WRITE(host, ARGL, cmd->arg & 0xffff);
OMAP_MMC_WRITE(host, ARGH, cmd->arg >> 16);
@@ -443,6 +557,8 @@ static irqreturn_t mmc_omap_irq(int irq, void *dev_id)
if (status & OMAP_MMC_STAT_CMD_TOUT) {
/* Timeouts are routine with some commands */
if (host->cmd) {
+ struct mmc_omap_slot *slot =
+ host->current_slot;
if (host->cmd->opcode != MMC_ALL_SEND_CID &&
host->cmd->opcode !=
MMC_SEND_OP_COND &&
@@ -753,11 +869,10 @@ mmc_omap_prepare_data(struct mmc_omap_host *host, struct mmc_request *req)
}
}

-static void mmc_omap_request(struct mmc_host *mmc, struct mmc_request *req)
+static void mmc_omap_start_request(struct mmc_omap_host *host,
+ struct mmc_request *req)
{
- struct mmc_omap_host *host = mmc_priv(mmc);
-
- WARN_ON(host->mrq != NULL);
+ BUG_ON(host->mrq != NULL);

host->mrq = req;

@@ -766,6 +881,26 @@ static void mmc_omap_request(struct mmc_host *mmc, struct mmc_request *req)
mmc_omap_start_command(host, req->cmd);
if (host->dma_in_use)
omap_start_dma(host->dma_ch);
+ BUG_ON(irqs_disabled());
+}
+
+static void mmc_omap_request(struct mmc_host *mmc, struct mmc_request *req)
+{
+ struct mmc_omap_slot *slot = mmc_priv(mmc);
+ struct mmc_omap_host *host = slot->host;
+ unsigned long flags;
+
+ spin_lock_irqsave(&host->slot_lock, flags);
+ if (host->mmc != NULL) {
+ BUG_ON(slot->mrq != NULL);
+ slot->mrq = req;
+ spin_unlock_irqrestore(&host->slot_lock, flags);
+ return;
+ } else
+ host->mmc = mmc;
+ spin_unlock_irqrestore(&host->slot_lock, flags);
+ mmc_omap_select_slot(slot, 1);
+ mmc_omap_start_request(host, req);
}

static void innovator_fpga_socket_power(int on)
@@ -819,7 +954,8 @@ static void mmc_omap_power(struct mmc_omap_host *host, int on)

static int mmc_omap_calc_divisor(struct mmc_host *mmc, struct mmc_ios *ios)
{
- struct mmc_omap_host *host = mmc_priv(mmc);
+ struct mmc_omap_slot *slot = mmc_priv(mmc);
+ struct mmc_omap_host *host = slot->host;
int func_clk_rate = clk_get_rate(host->fclk);
int dsor;

@@ -836,6 +972,8 @@ static int mmc_omap_calc_divisor(struct mmc_host *mmc, struct mmc_ios *ios)
if (dsor > 250)
dsor = 250;

+ slot->fclk_freq = func_clk_rate / dsor;
+
if (ios->bus_width == MMC_BUS_WIDTH_4)
dsor |= 1 << 15;

@@ -844,9 +982,9 @@ static int mmc_omap_calc_divisor(struct mmc_host *mmc, struct mmc_ios *ios)

static void mmc_omap_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
{
- struct mmc_omap_host *host = mmc_priv(mmc);
- int dsor;
- int i;
+ struct mmc_omap_slot *slot = mmc_priv(mmc);
+ struct mmc_omap_host *host = slot->host;
+ int i, dsor;

dsor = mmc_omap_calc_divisor(mmc, ios);
host->bus_mode = ios->bus_mode;
@@ -886,9 +1024,11 @@ static void mmc_omap_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)

static int mmc_omap_get_ro(struct mmc_host *mmc)
{
- struct mmc_omap_host *host = mmc_priv(mmc);
+ struct mmc_omap_slot *slot = mmc_priv(mmc);

- return host->wp_pin && omap_get_gpio_datain(host->wp_pin);
+ if (slot->pdata->get_ro != NULL)
+ return slot->pdata->get_ro(mmc_dev(mmc), slot->id);
+ return 0;
}

static const struct mmc_host_ops mmc_omap_ops = {
@@ -897,19 +1037,106 @@ static const struct mmc_host_ops mmc_omap_ops = {
.get_ro = mmc_omap_get_ro,
};

-static int __init mmc_omap_probe(struct platform_device *pdev)
+static int __init mmc_omap_new_slot(struct mmc_omap_host *host, int id)
{
- struct omap_mmc_conf *minfo = pdev->dev.platform_data;
+ struct mmc_omap_slot *slot = NULL;
struct mmc_host *mmc;
+ int r;
+
+ mmc = mmc_alloc_host(sizeof(struct mmc_omap_slot), host->dev);
+ if (mmc == NULL)
+ return -ENOMEM;
+
+ slot = mmc_priv(mmc);
+ slot->host = host;
+ slot->mmc = mmc;
+ slot->id = id;
+ slot->pdata = &host->pdata->slots[id];
+
+ host->slots[id] = slot;
+
+ mmc->caps = MMC_CAP_MULTIWRITE | MMC_CAP_MMC_HIGHSPEED |
+ MMC_CAP_SD_HIGHSPEED;
+ if (host->pdata->conf.wire4)
+ mmc->caps |= MMC_CAP_4_BIT_DATA;
+
+ mmc->ops = &mmc_omap_ops;
+ mmc->f_min = 400000;
+
+ if (cpu_class_is_omap2())
+ mmc->f_max = 48000000;
+ else
+ mmc->f_max = 24000000;
+ if (host->pdata->max_freq)
+ mmc->f_max = min(host->pdata->max_freq, mmc->f_max);
+ mmc->ocr_avail = slot->pdata->ocr_mask;
+
+ /* 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;
+
+ r = mmc_add_host(mmc);
+ if (r < 0)
+ return r;
+
+ if (slot->pdata->name != NULL) {
+ r = device_create_file(&mmc->class_dev,
+ &dev_attr_slot_name);
+ if (r < 0)
+ goto err_remove_host;
+ }
+
+ if (slot->pdata->get_ro != NULL) {
+ r = device_create_file(&mmc->class_dev,
+ &dev_attr_ro);
+ }
+
+ return 0;
+
+err_remove_slot_name:
+ if (slot->pdata->name != NULL)
+ device_remove_file(&mmc->class_dev, &dev_attr_ro);
+err_remove_host:
+ mmc_remove_host(mmc);
+ return r;
+}
+
+static void mmc_omap_remove_slot(struct mmc_omap_slot *slot)
+{
+ struct mmc_host *mmc = slot->mmc;
+
+ if (slot->pdata->name != NULL)
+ device_remove_file(&mmc->class_dev, &dev_attr_slot_name);
+ if (slot->pdata->get_ro != NULL)
+ device_remove_file(&mmc->class_dev, &dev_attr_ro);
+
+ mmc_remove_host(mmc);
+ mmc_free_host(mmc);
+}
+
+static int __init mmc_omap_probe(struct platform_device *pdev)
+{
+ struct omap_mmc_platform_data *pdata = pdev->dev.platform_data;
struct mmc_omap_host *host = NULL;
struct resource *res;
- int ret = 0;
+ int i, ret = 0;
int irq;

- if (minfo == NULL) {
+ if (pdata == NULL) {
dev_err(&pdev->dev, "platform data missing\n");
return -ENXIO;
}
+ if (pdata->nr_slots == 0) {
+ dev_err(&pdev->dev, "no slots\n");
+ return -ENXIO;
+ }

res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
irq = platform_get_irq(pdev, 0);
@@ -917,28 +1144,39 @@ static int __init mmc_omap_probe(struct platform_device *pdev)
return -ENXIO;

res = request_mem_region(res->start, res->end - res->start + 1,
- pdev->name);
+ pdev->name);
if (res == NULL)
return -EBUSY;

- mmc = mmc_alloc_host(sizeof(struct mmc_omap_host), &pdev->dev);
- if (mmc == NULL) {
+ host = kzalloc(sizeof(struct mmc_omap_host), GFP_KERNEL);
+ if (host == NULL) {
ret = -ENOMEM;
goto err_free_mem_region;
}

- host = mmc_priv(mmc);
- host->mmc = mmc;
-
spin_lock_init(&host->dma_lock);
init_timer(&host->dma_timer);
+ spin_lock_init(&host->slot_lock);
+ init_waitqueue_head(&host->slot_wq);
+
host->dma_timer.function = mmc_omap_dma_timer;
host->dma_timer.data = (unsigned long) host;

+ host->pdata = pdata;
+ host->dev = &pdev->dev;
+ platform_set_drvdata(pdev, host);
+
host->id = pdev->id;
host->mem_res = res;
host->irq = irq;

+ host->use_dma = 1;
+ host->dma_ch = -1;
+
+ host->irq = irq;
+ host->phys_base = host->mem_res->start;
+ host->virt_base = (void __iomem *) IO_ADDRESS(host->phys_base);
+
if (cpu_is_omap24xx()) {
host->iclk = clk_get(&pdev->dev, "mmc_ick");
if (IS_ERR(host->iclk))
@@ -956,70 +1194,34 @@ static int __init mmc_omap_probe(struct platform_device *pdev)
goto err_free_iclk;
}

- /* REVISIT:
- * Also, use minfo->cover to decide how to manage
- * the card detect sensing.
- */
- host->power_pin = minfo->power_pin;
- host->wp_pin = minfo->wp_pin;
- host->use_dma = 1;
- host->dma_ch = -1;
-
- host->irq = irq;
- host->phys_base = host->mem_res->start;
- host->virt_base = (void __iomem *) IO_ADDRESS(host->phys_base);
+ ret = request_irq(host->irq, mmc_omap_irq, 0, DRIVER_NAME, host);
+ if (ret)
+ goto err_free_fclk;

- mmc->ops = &mmc_omap_ops;
- mmc->f_min = 400000;
- mmc->f_max = 24000000;
- mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
- mmc->caps = MMC_CAP_MULTIWRITE;
+ if (pdata->init != NULL) {
+ ret = pdata->init(&pdev->dev);
+ if (ret < 0)
+ goto err_free_irq;
+ }

- if (minfo->wire4)
- mmc->caps |= MMC_CAP_4_BIT_DATA;
+ 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]);

- /* 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;
+ goto err_plat_cleanup;
}
- 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;
-
- host->dev = &pdev->dev;
- platform_set_drvdata(pdev, host);
-
- mmc_add_host(mmc);
-
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:
@@ -1028,7 +1230,7 @@ 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;
@@ -1037,16 +1239,18 @@ 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))
@@ -1055,7 +1259,7 @@ 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;
}
@@ -1063,35 +1267,47 @@ 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
diff --git a/include/asm-arm/arch-omap/mmc.h b/include/asm-arm/arch-omap/mmc.h
index b70e37b..c9588f4 100644
--- a/include/asm-arm/arch-omap/mmc.h
+++ b/include/asm-arm/arch-omap/mmc.h
@@ -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;
-- 1.5.3.GIT

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