From: Jerry Huang <chang-ming.hu...@freescale.com>
In order to check if the card is present, we will read the PRESENT STATE
register and check the bit13(Card detect pin level) and bit15(CINS).
Signed-off-by: Jerry Huang <chang-ming.hu...@freescale.com>
Reviewed-by: Anton Vorontsov <cbouatmai...@gmail.com>
CC: Chris Ball <c...@laptop.org>
---
changes for v2:
- add new callback for esdhc to detect the card state
- add the CC
changes for v3:
- enable the controller clock when detect the card state, not core
changes for v4:
- based on the latest version
changes for v5:
- modify codes according to Anton's suggest and add reviewed-by.
changes for v6:
- change the variable to u32 and change the retrun value.
drivers/mmc/host/sdhci-of-esdhc.c | 26 ++++++++++++++++++++++++++
1 file changed, 26 insertions(+)
diff --git a/drivers/mmc/host/sdhci-of-esdhc.c
b/drivers/mmc/host/sdhci-of-esdhc.c
index f32526d..dbb32a5 100644
--- a/drivers/mmc/host/sdhci-of-esdhc.c
+++ b/drivers/mmc/host/sdhci-of-esdhc.c
@@ -230,6 +230,31 @@ static void esdhc_of_platform_init(struct sdhci_host *host)
host->quirks &= ~SDHCI_QUIRK_NO_BUSY_IRQ;
}
+/* Return: 1 - the card is present; 0 - card is absent */
+static int esdhc_of_get_cd(struct sdhci_host *host)
+{
+ u32 present;
+ u32 sysctl;
+
+ if (host->flags & SDHCI_DEVICE_DEAD)
+ return 0;
+
+ sysctl = sdhci_be32bs_readl(host, SDHCI_CLOCK_CONTROL);
+
+ /* Enable the controller clock to update the present state */
+ sdhci_be32bs_writel(host, sysctl | SDHCI_CLOCK_INT_EN,
+ SDHCI_CLOCK_CONTROL);
+
+ /* Detect the card present or absent */
+ present = sdhci_be32bs_readl(host, SDHCI_PRESENT_STATE);
+ present &= (SDHCI_CARD_PRESENT | SDHCI_CARD_CDPL);
+
+ /* Resave the previous to System control register */
+ sdhci_be32bs_writel(host, sysctl, SDHCI_CLOCK_CONTROL);
+
+ return !!present;
+}
+
static struct sdhci_ops sdhci_esdhc_ops = {
.read_l = esdhc_readl,
.read_w = esdhc_readw,
@@ -242,6 +267,7 @@ static struct sdhci_ops sdhci_esdhc_ops = {
.get_max_clock = esdhc_of_get_max_clock,
.get_min_clock = esdhc_of_get_min_clock,
.platform_init = esdhc_of_platform_init,
+ .get_cd = esdhc_of_get_cd,
#ifdef CONFIG_PM
.platform_suspend = esdhc_of_suspend,
.platform_resume = esdhc_of_resume,
--
1.7.9.5
--
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