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ppc4xx: Add functionality to GPIO support 

This patch makes two additions to GPIO support:

First, it adds function gpio_read_in_bit() to read the a bit from the
GPIO Input Register (GPIOx_IR) in the same way that function
gpio_read_out_bit() reads a bit from the GPIO Output Register
(GPIOx_OR).

Second, it modifies function gpio_set_chip_configuration() to provide
an additional option for configuring the GPIO from the
"CFG_4xx_GPIO_TABLE".

According to the 440EPx User's Manual, when an alternate output is used,
the three-state control is configured in one of two ways, depending on
the particular output.  The first option is to select the corresponding
alternate three-state control in the GPIOx_TRSH/L registers.  The second
option is to select the GPIO Three-State Control Register (GPIOx_TCR) in
the GPIOx_TRSH/L registers, and set the corresponding bit in the
GPIOx_TCR register to enable the output.  For example, the Manual
specifies configuring the GPIO00 Alternate 1 Signal (PreAddr07) to use
the alternate three-state control (first option), and specifies
configuring the GPIO32 Alternate 1 Signal (USB2OM0) with the output
enabled in the GPIOx_TCR register (second option).

Currently, gpio_set_chip_configuration() configures all alternate signal
outputs to use the first option.  This patch allow the second option to
be selected by setting the "out_val" element in the table entry to
"GPIO_OUT_1".  The first option is used when the "out_val" element is
set to "GPIO_OUT_0".  Because "out_val" is not currently used when an
alternate signal is selected, and because all current GPIO tables set
"out_val" to "GPIO_OUT_0" for all alternate signals, this patch should
not change any existing configurations.

Signed-off-by: Larry Johnson <lrj@acm.org>
This commit is contained in:
Lawrence R. Johnson 2008-01-03 18:54:00 -05:00 committed by Stefan Roese
parent 196404cdc1
commit 5ab884b254
2 changed files with 41 additions and 23 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

63
cpu/ppc4xx/gpio.c
View File

@ -27,7 +27,7 @@
#include <asm/gpio.h>
#if defined(CFG_4xx_GPIO_TABLE)
gpio_param_s gpio_tab[GPIO_GROUP_MAX][GPIO_MAX] = CFG_4xx_GPIO_TABLE;
gpio_param_s const gpio_tab[GPIO_GROUP_MAX][GPIO_MAX] = CFG_4xx_GPIO_TABLE;
#endif
#if defined(GPIO0_OSRL)
@ -120,6 +120,18 @@ int gpio_read_out_bit(int pin)
return (in_be32((void *)GPIO0_OR + offs) & GPIO_VAL(pin) ? 1 : 0);
}
int gpio_read_in_bit(int pin)
{
u32 offs = 0;
if (pin >= GPIO_MAX) {
offs = 0x100;
pin -= GPIO_MAX;
}
return (in_be32((void *)GPIO0_IR + offs) & GPIO_VAL(pin) ? 1 : 0);
}
#if defined(CFG_4xx_GPIO_TABLE)
void gpio_set_chip_configuration(void)
{
@ -171,6 +183,8 @@ void gpio_set_chip_configuration(void)
if ((gpio_tab[gpio_core][i].in_out == GPIO_OUT) ||
(gpio_tab[gpio_core][i].in_out == GPIO_BI)) {
u32 gpio_alt_sel = 0;
switch (gpio_tab[gpio_core][i].alt_nb) {
case GPIO_SEL:
/*
@ -199,37 +213,40 @@ void gpio_set_chip_configuration(void)
break;
case GPIO_ALT1:
reg = in_be32((void *)GPIO_OS(core_add+offs))
& ~(GPIO_MASK >> (j*2));
reg = reg | (GPIO_ALT1_SEL >> (j*2));
out_be32((void *)GPIO_OS(core_add+offs), reg);
reg = in_be32((void *)GPIO_TS(core_add+offs))
& ~(GPIO_MASK >> (j*2));
reg = reg | (GPIO_ALT1_SEL >> (j*2));
out_be32((void *)GPIO_TS(core_add+offs), reg);
gpio_alt_sel = GPIO_ALT1_SEL;
break;
case GPIO_ALT2:
reg = in_be32((void *)GPIO_OS(core_add+offs))
& ~(GPIO_MASK >> (j*2));
reg = reg | (GPIO_ALT2_SEL >> (j*2));
out_be32((void *)GPIO_OS(core_add+offs), reg);
reg = in_be32((void *)GPIO_TS(core_add+offs))
& ~(GPIO_MASK >> (j*2));
reg = reg | (GPIO_ALT2_SEL >> (j*2));
out_be32((void *)GPIO_TS(core_add+offs), reg);
gpio_alt_sel = GPIO_ALT2_SEL;
break;
case GPIO_ALT3:
gpio_alt_sel = GPIO_ALT3_SEL;
break;
}
if (0 != gpio_alt_sel) {
reg = in_be32((void *)GPIO_OS(core_add+offs))
& ~(GPIO_MASK >> (j*2));
reg = reg | (GPIO_ALT3_SEL >> (j*2));
reg = reg | (gpio_alt_sel >> (j*2));
out_be32((void *)GPIO_OS(core_add+offs), reg);
reg = in_be32((void *)GPIO_TS(core_add+offs))
& ~(GPIO_MASK >> (j*2));
reg = reg | (GPIO_ALT3_SEL >> (j*2));
out_be32((void *)GPIO_TS(core_add+offs), reg);
break;
if (gpio_tab[gpio_core][i].out_val == GPIO_OUT_1) {
reg = in_be32((void *)GPIO_TCR(core_add))
| (0x80000000 >> (i));
out_be32((void *)GPIO_TCR(core_add), reg);
reg = in_be32((void *)GPIO_TS(core_add+offs))
& ~(GPIO_MASK >> (j*2));
out_be32((void *)GPIO_TS(core_add+offs), reg);
} else {
reg = in_be32((void *)GPIO_TCR(core_add))
& ~(0x80000000 >> (i));
out_be32((void *)GPIO_TCR(core_add), reg);
reg = in_be32((void *)GPIO_TS(core_add+offs))
& ~(GPIO_MASK >> (j*2));
reg = reg | (gpio_alt_sel >> (j*2));
out_be32((void *)GPIO_TS(core_add+offs), reg);
}
}
}
}

1
include/asm-ppc/gpio.h
View File

@ -88,6 +88,7 @@ typedef struct {
void gpio_config(int pin, int in_out, int gpio_alt, int out_val);
void gpio_write_bit(int pin, int val);
int gpio_read_out_bit(int pin);
int gpio_read_in_bit(int pin);
void gpio_set_chip_configuration(void);
#endif /* __ASM_PPC_GPIO_H */