Hi Samuel,
Could you please review this patch which touches mfd/twl6030-irq.c for
card detect support
of MMC1 controller on OMAP4.
Regards,
Kishore
On Mon, Sep 27, 2010 at 1:25 PM, kishore kadiyala
<kishorek.kadiyala@xxxxxxxxx> wrote:
> Cc: Samuel Ortiz <sameo@xxxxxxxxxxxxxxx>
>
> On Fri, Sep 24, 2010 at 10:43 PM, kishore kadiyala
> <kishore.kadiyala@xxxxxx> wrote:
>> Adding card detect callback function and card detect configuration
>> function for MMC1 Controller on OMAP4.
>>
>> Card detect configuration function does initial configuration of the
>> MMC Control & PullUp-PullDown registers of Phoenix.
>>
>> For MMC1 Controller, card detect interrupt source is
>> twl6030 which is non-gpio. The card detect call back function provides
>> card present/absent status by reading MMC Control register present
>> on twl6030.
>>
>> Since OMAP4 doesn't use any GPIO line as used in OMAP3 for card detect,
>> the suspend/resume initialization which was done in omap_hsmmc_gpio_init
>> previously is moved to the probe thus making it generic for both OMAP3 & OMAP4.
>>
>> Cc: Tony Lindgren <tony@xxxxxxxxxxx>
>> Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
>> Cc: Madhusudhan Chikkature <madhu.cr@xxxxxx>
>> Cc: Adrian Hunter <adrian.hunter@xxxxxxxxx>
>> Signed-off-by: Kishore Kadiyala <kishore.kadiyala@xxxxxx>
>> ---
>> arch/arm/mach-omap2/board-4430sdp.c | 7 +++-
>> drivers/mfd/twl6030-irq.c | 73 +++++++++++++++++++++++++++++++++++
>> drivers/mmc/host/omap_hsmmc.c | 4 +-
>> include/linux/i2c/twl.h | 31 +++++++++++++++
>> 4 files changed, 112 insertions(+), 3 deletions(-)
>>
>> diff --git a/arch/arm/mach-omap2/board-4430sdp.c b/arch/arm/mach-omap2/board-4430sdp.c
>> index 9447644..a49f285 100644
>> --- a/arch/arm/mach-omap2/board-4430sdp.c
>> +++ b/arch/arm/mach-omap2/board-4430sdp.c
>> @@ -227,9 +227,14 @@ static int omap4_twl6030_hsmmc_late_init(struct device *dev)
>> struct omap_mmc_platform_data *pdata = dev->platform_data;
>>
>> /* Setting MMC1 Card detect Irq */
>> - if (pdev->id == 0)
>> + if (pdev->id == 0) {
>> + ret = twl6030_mmc_card_detect_config();
>> + if (ret)
>> + pr_err("Failed configuring MMC1 card detect\n");
>> pdata->slots[0].card_detect_irq = TWL6030_IRQ_BASE +
>> MMCDETECT_INTR_OFFSET;
>> + pdata->slots[0].card_detect = twl6030_mmc_card_detect;
>> + }
>> return ret;
>> }
>>
>> diff --git a/drivers/mfd/twl6030-irq.c b/drivers/mfd/twl6030-irq.c
>> index 10bf228..2d3bb82 100644
>> --- a/drivers/mfd/twl6030-irq.c
>> +++ b/drivers/mfd/twl6030-irq.c
>> @@ -36,6 +36,7 @@
>> #include <linux/irq.h>
>> #include <linux/kthread.h>
>> #include <linux/i2c/twl.h>
>> +#include <linux/platform_device.h>
>>
>> /*
>> * TWL6030 (unlike its predecessors, which had two level interrupt handling)
>> @@ -223,6 +224,78 @@ int twl6030_interrupt_mask(u8 bit_mask, u8 offset)
>> }
>> EXPORT_SYMBOL(twl6030_interrupt_mask);
>>
>> +int twl6030_mmc_card_detect_config(void)
>> +{
>> + int ret;
>> + u8 reg_val = 0;
>> +
>> + /* Unmasking the Card detect Interrupt line for MMC1 from Phoenix */
>> + twl6030_interrupt_unmask(TWL6030_MMCDETECT_INT_MASK,
>> + REG_INT_MSK_LINE_B);
>> + twl6030_interrupt_unmask(TWL6030_MMCDETECT_INT_MASK,
>> + REG_INT_MSK_STS_B);
>> + /*
>> + * Intially Configuring MMC_CTRL for receving interrupts &
>> + * Card status on TWL6030 for MMC1
>> + */
>> + ret = twl_i2c_read_u8(TWL6030_MODULE_ID0, ®_val, TWL6030_MMCCTRL);
>> + if (ret < 0) {
>> + pr_err("twl6030: Failed to read MMCCTRL, error %d\n", ret);
>> + return ret;
>> + }
>> + reg_val &= ~VMMC_AUTO_OFF;
>> + reg_val |= SW_FC;
>> + ret = twl_i2c_write_u8(TWL6030_MODULE_ID0, reg_val, TWL6030_MMCCTRL);
>> + if (ret < 0) {
>> + pr_err("twl6030: Failed to write MMCCTRL, error %d\n", ret);
>> + return ret;
>> + }
>> +
>> + /* Configuring PullUp-PullDown register */
>> + ret = twl_i2c_read_u8(TWL6030_MODULE_ID0, ®_val,
>> + TWL6030_CFG_INPUT_PUPD3);
>> + if (ret < 0) {
>> + pr_err("twl6030: Failed to read CFG_INPUT_PUPD3, error %d\n",
>> + ret);
>> + return ret;
>> + }
>> + reg_val &= ~(MMC_PU | MMC_PD);
>> + ret = twl_i2c_write_u8(TWL6030_MODULE_ID0, reg_val,
>> + TWL6030_CFG_INPUT_PUPD3);
>> + if (ret < 0) {
>> + pr_err("twl6030: Failed to write CFG_INPUT_PUPD3, error %d\n",
>> + ret);
>> + return ret;
>> + }
>> + return 0;
>> +}
>> +EXPORT_SYMBOL(twl6030_mmc_card_detect_config);
>> +
>> +int twl6030_mmc_card_detect(struct device *dev, int slot)
>> +{
>> + int ret = -EIO;
>> + u8 read_reg = 0;
>> + struct platform_device *pdev = to_platform_device(dev);
>> +
>> + if (pdev->id) {
>> + /* TWL6030 provide's Card detect support for
>> + * only MMC1 controller.
>> + */
>> + pr_err("Unkown MMC controller %d in %s\n", pdev->id, __func__);
>> + return ret;
>> + }
>> + /*
>> + * BIT0 of MMC_CTRL on TWL6030 provides card status for MMC1
>> + * 0 - Card not present ,1 - Card present
>> + */
>> + ret = twl_i2c_read_u8(TWL6030_MODULE_ID0, &read_reg,
>> + TWL6030_MMCCTRL);
>> + if (ret >= 0)
>> + ret = read_reg & STS_MMC;
>> + return ret;
>> +}
>> +EXPORT_SYMBOL(twl6030_mmc_card_detect);
>> +
>> int twl6030_init_irq(int irq_num, unsigned irq_base, unsigned irq_end)
>> {
>>
>> diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
>> index 562dbbb..a51894d 100644
>> --- a/drivers/mmc/host/omap_hsmmc.c
>> +++ b/drivers/mmc/host/omap_hsmmc.c
>> @@ -466,8 +466,6 @@ static int omap_hsmmc_gpio_init(struct omap_mmc_platform_data *pdata)
>> int ret;
>>
>> if (gpio_is_valid(pdata->slots[0].switch_pin)) {
>> - pdata->suspend = omap_hsmmc_suspend_cdirq;
>> - pdata->resume = omap_hsmmc_resume_cdirq;
>> if (pdata->slots[0].cover)
>> pdata->slots[0].get_cover_state =
>> omap_hsmmc_get_cover_state;
>> @@ -2211,6 +2209,8 @@ static int __init omap_hsmmc_probe(struct platform_device *pdev)
>> "Unable to grab MMC CD IRQ\n");
>> goto err_irq_cd;
>> }
>> + pdata->suspend = omap_hsmmc_suspend_cdirq;
>> + pdata->resume = omap_hsmmc_resume_cdirq;
>> }
>>
>> omap_hsmmc_disable_irq(host);
>> diff --git a/include/linux/i2c/twl.h b/include/linux/i2c/twl.h
>> index 6de90bf..e64894c 100644
>> --- a/include/linux/i2c/twl.h
>> +++ b/include/linux/i2c/twl.h
>> @@ -141,6 +141,16 @@
>> #define TWL6030_CHARGER_CTRL_INT_MASK 0x10
>> #define TWL6030_CHARGER_FAULT_INT_MASK 0x60
>>
>> +#define TWL6030_MMCCTRL 0xEE
>> +#define VMMC_AUTO_OFF (0x1 << 3)
>> +#define SW_FC (0x1 << 2)
>> +#define STS_MMC 0x1
>> +
>> +#define TWL6030_CFG_INPUT_PUPD3 0xF2
>> +#define MMC_PU (0x1 << 3)
>> +#define MMC_PD (0x1 << 2)
>> +
>> +
>>
>> #define TWL4030_CLASS_ID 0x4030
>> #define TWL6030_CLASS_ID 0x6030
>> @@ -173,6 +183,27 @@ int twl_i2c_read(u8 mod_no, u8 *value, u8 reg, unsigned num_bytes);
>> int twl6030_interrupt_unmask(u8 bit_mask, u8 offset);
>> int twl6030_interrupt_mask(u8 bit_mask, u8 offset);
>>
>> +/* Card detect Configuration for MMC1 Controller on OMAP4 */
>> +#ifdef CONFIG_TWL4030_CORE
>> +int twl6030_mmc_card_detect_config(void);
>> +#else
>> +static inline int twl6030_mmc_card_detect_config(void)
>> +{
>> + pr_debug("twl6030_mmc_card_detect_config not supported\n");
>> + return 0;
>> +}
>> +#endif
>> +
>> +/* MMC1 Controller on OMAP4 uses Phoenix irq for Card detect */
>> +#ifdef CONFIG_TWL4030_CORE
>> +int twl6030_mmc_card_detect(struct device *dev, int slot);
>> +#else
>> +static inline int twl6030_mmc_card_detect(struct device *dev, int slot)
>> +{
>> + pr_debug("Call back twl6030_mmc_card_detect not supported\n");
>> + return -EIO;
>> +}
>> +#endif
>> /*----------------------------------------------------------------------*/
>>
>> /*
>> --
>> 1.7.0.4
>>
>>
>> --
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