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https://github.com/brain-hackers/u-boot-brain
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5ab884b254
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> |
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| .. | ||
| 74xx_7xx | ||
| arm_intcm | ||
| arm720t | ||
| arm920t | ||
| arm925t | ||
| arm926ejs | ||
| arm946es | ||
| arm1136 | ||
| at32ap | ||
| bf533 | ||
| bf537 | ||
| bf561 | ||
| i386 | ||
| ixp | ||
| lh7a40x | ||
| mcf52x2 | ||
| mcf523x | ||
| mcf532x | ||
| mcf5445x | ||
| microblaze | ||
| mips | ||
| mpc5xx | ||
| mpc5xxx | ||
| mpc8xx | ||
| mpc83xx | ||
| mpc85xx | ||
| mpc86xx | ||
| mpc512x | ||
| mpc824x | ||
| mpc8220 | ||
| mpc8260 | ||
| nios | ||
| nios2 | ||
| ppc4xx | ||
| pxa | ||
| s3c44b0 | ||
| sa1100 | ||
| sh4 | ||