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authorNick Thompson <nick.thompson@gefanuc.com>2009-11-12 11:03:23 -0500
committerTom Rix <Tom.Rix@windriver.com>2009-11-27 16:26:14 -0600
commitca8480d444bdcc1670e42a613c5a5e4e8366d2d9 (patch)
tree3704de6352f5538f717f57b200e49fe0868fd5eb /board
parent9868a36dfb8de4bb98b48e4f4eb912312d67279e (diff)
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TI Davinci: add a pin multiplexer configuration API
Creates a method allowing pin settings to be logically grouped into data structure arrays and provides an API to configure the pinmux settings to enable the relevant pin functions. Signed-off-by: Nick Thompson <nick.thompson@gefanuc.com>
Diffstat (limited to 'board')
-rw-r--r--board/davinci/common/misc.c48
-rw-r--r--board/davinci/common/misc.h12
2 files changed, 59 insertions, 1 deletions
diff --git a/board/davinci/common/misc.c b/board/davinci/common/misc.c
index ffdc20b..9fab76f 100644
--- a/board/davinci/common/misc.c
+++ b/board/davinci/common/misc.c
@@ -1,6 +1,7 @@
/*
* Miscelaneous DaVinci functions.
*
+ * Copyright (C) 2009 Nick Thompson, GE Fanuc Ltd, <nick.thompson@gefanuc.com>
* Copyright (C) 2007 Sergey Kubushyn <ksi@koi8.net>
* Copyright (C) 2008 Lyrtech <www.lyrtech.com>
* Copyright (C) 2004 Texas Instruments.
@@ -27,7 +28,8 @@
#include <i2c.h>
#include <net.h>
#include <asm/arch/hardware.h>
-
+#include <asm/io.h>
+#include "misc.h"
DECLARE_GLOBAL_DATA_PTR;
@@ -109,3 +111,47 @@ void dv_configure_mac_address(uint8_t *rom_enetaddr)
}
#endif /* DAVINCI_EMAC */
+
+/*
+ * Change the setting of a pin multiplexer field.
+ *
+ * Takes an array of pinmux settings similar to:
+ *
+ * struct pinmux_config uart_pins[] = {
+ * { &davinci_syscfg_regs->pinmux[8], 2, 7 },
+ * { &davinci_syscfg_regs->pinmux[9], 2, 0 }
+ * };
+ *
+ * Stepping through the array, each pinmux[n] register has the given value
+ * set in the pin mux field specified.
+ *
+ * The number of pins in the array must be passed (ARRAY_SIZE can provide
+ * this value conveniently).
+ *
+ * Returns 0 if all field numbers and values are in the correct range,
+ * else returns -1.
+ */
+int davinci_configure_pin_mux(const struct pinmux_config *pins,
+ const int n_pins)
+{
+ int i;
+
+ /* check for invalid pinmux values */
+ for (i = 0; i < n_pins; i++) {
+ if (pins[i].field >= PIN_MUX_NUM_FIELDS ||
+ (pins[i].value & ~PIN_MUX_FIELD_MASK) != 0)
+ return -1;
+ }
+
+ /* configure the pinmuxes */
+ for (i = 0; i < n_pins; i++) {
+ const int offset = pins[i].field * PIN_MUX_FIELD_SIZE;
+ const unsigned int value = pins[i].value << offset;
+ const unsigned int mask = PIN_MUX_FIELD_MASK << offset;
+ const dv_reg *mux = pins[i].mux;
+
+ writel(value | (readl(mux) & (~mask)), mux);
+ }
+
+ return 0;
+}
diff --git a/board/davinci/common/misc.h b/board/davinci/common/misc.h
index dc3cc41..f6d8b1b 100644
--- a/board/davinci/common/misc.h
+++ b/board/davinci/common/misc.h
@@ -22,8 +22,20 @@
#ifndef __MISC_H
#define __MISC_H
+/* pin muxer definitions */
+#define PIN_MUX_NUM_FIELDS 8 /* Per register */
+#define PIN_MUX_FIELD_SIZE 4 /* n in bits */
+#define PIN_MUX_FIELD_MASK ((1 << PIN_MUX_FIELD_SIZE) - 1)
+
+/* pin definition */
+struct pinmux_config {
+ dv_reg *mux; /* Address of mux register */
+ unsigned char value; /* Value to set in field */
+ unsigned char field; /* field number */
+};
int dvevm_read_mac_address(uint8_t *buf);
void dv_configure_mac_address(uint8_t *rom_enetaddr);
+int davinci_configure_pin_mux(const struct pinmux_config *pins, int n_pins);
#endif /* __MISC_H */