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authorValentin Longchamp <valentin.longchamp@epfl.ch>2009-01-28 15:13:50 +0100
committerSascha Hauer <s.hauer@pengutronix.de>2009-03-13 10:34:00 +0100
commitb7222631c3d0fd26e6d85dd78b1d0aa10dc64929 (patch)
tree7b2469bb834187e7a4386eb7455cfc17605acef5 /arch/arm/plat-mxc
parent41a1d91e7e7b08a13d78e03e67dcd7634f2d5cca (diff)
mx31: rework of iomux support
This new implemenatation avoids that two physical pins are claimed by the same driver (also with the the gpr hardware modes). The gpio kernel lib is also called when a capable gpio pin is assigned its gpio function. The mxc_iomux_mode function is still here for backward compatibility but should not be used anymore. V2: In the precendent revision, the iomux code was claiming a pin when its hardware mode was changed. This was uncorrect: when the hardware mode is changed, the pin must still be claimed through the iomux. In order to have a pin working in mode hw2, we must fist issue the mxc_iomux_set_gpr call and then the corresponding mxc_iomux_mode calls with the FUNC mode (usually done with mxc_iomux_setup_multiple_pins). The reverse calls must be done to fee the pins. Signed-off-by: Valentin Longchamp <valentin.longchamp@epfl.ch> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'arch/arm/plat-mxc')
-rw-r--r--arch/arm/plat-mxc/include/mach/iomux-mx3.h45
1 files changed, 38 insertions, 7 deletions
diff --git a/arch/arm/plat-mxc/include/mach/iomux-mx3.h b/arch/arm/plat-mxc/include/mach/iomux-mx3.h
index c9198c0aea1..4bdc4712be1 100644
--- a/arch/arm/plat-mxc/include/mach/iomux-mx3.h
+++ b/arch/arm/plat-mxc/include/mach/iomux-mx3.h
@@ -92,7 +92,7 @@ enum iomux_gp_func {
MUX_EXTDMAREQ2_MBX_SEL = 1 << 15,
MUX_TAMPER_DETECT_EN = 1 << 16,
MUX_PGP_USB_4WIRE = 1 << 17,
- MUX_PGB_USB_COMMON = 1 << 18,
+ MUX_PGP_USB_COMMON = 1 << 18,
MUX_SDHC_MEMSTICK1 = 1 << 19,
MUX_SDHC_MEMSTICK2 = 1 << 20,
MUX_PGP_SPLL_BYP = 1 << 21,
@@ -109,21 +109,44 @@ enum iomux_gp_func {
};
/*
- * This function enables/disables the general purpose function for a particular
- * signal.
+ * setups a single pin:
+ * - reserves the pin so that it is not claimed by another driver
+ * - setups the iomux according to the configuration
+ * - if the pin is configured as a GPIO, we claim it throug kernel gpiolib
+ */
+int mxc_iomux_setup_pin(const unsigned int pin, const char *label);
+/*
+ * setups mutliple pins
+ * convenient way to call the above function with tables
*/
-void iomux_config_gpr(enum iomux_gp_func , bool);
+int mxc_iomux_setup_multiple_pins(unsigned int *pin_list, unsigned count,
+ const char *label);
/*
- * set the mode for a IOMUX pin.
+ * releases a single pin:
+ * - make it available for a future use by another driver
+ * - frees the GPIO if the pin was configured as GPIO
+ * - DOES NOT reconfigure the IOMUX in its reset state
*/
-int mxc_iomux_mode(unsigned int);
+void mxc_iomux_release_pin(const unsigned int pin);
+/*
+ * releases multiple pins
+ * convenvient way to call the above function with tables
+ */
+void mxc_iomux_release_multiple_pins(unsigned int *pin_list, int count);
/*
* This function enables/disables the general purpose function for a particular
* signal.
*/
-void mxc_iomux_set_gpr(enum iomux_gp_func, bool);
+void mxc_iomux_set_gpr(enum iomux_gp_func, bool en);
+
+/*
+ * This function only configures the iomux hardware.
+ * It is called by the setup functions and should not be called directly anymore.
+ * It is here visible for backward compatibility
+ */
+int mxc_iomux_mode(unsigned int pin_mode);
#define IOMUX_PADNUM_MASK 0x1ff
#define IOMUX_GPIONUM_SHIFT 9
@@ -144,6 +167,11 @@ void mxc_iomux_set_gpr(enum iomux_gp_func, bool);
MXC_GPIO_IRQ_START)
/*
+ * The number of gpio devices among the pads
+ */
+#define GPIO_PORT_MAX 3
+
+/*
* This enumeration is constructed based on the Section
* "sw_pad_ctl & sw_mux_ctl details" of the MX31 IC Spec. Each enumerated
* value is constructed based on the rules described above.
@@ -480,6 +508,9 @@ enum iomux_pins {
MX31_PIN_CAPTURE = IOMUX_PIN( 7, 327),
};
+#define PIN_MAX 327
+#define NB_PORTS 12 /* NB_PINS/32, we chose 32 pins per "PORT" */
+
/*
* Convenience values for use with mxc_iomux_mode()
*