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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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| .. | ||
| 4xx_enet.c | ||
| 4xx_pci.c | ||
| 4xx_pcie.c | ||
| 4xx_uart.c | ||
| 40x_spd_sdram.c | ||
| 44x_spd_ddr2.c | ||
| 44x_spd_ddr.c | ||
| bedbug_405.c | ||
| cache.S | ||
| commproc.c | ||
| config.mk | ||
| cpu_init.c | ||
| cpu.c | ||
| dcr.S | ||
| denali_data_eye.c | ||
| denali_spd_ddr2.c | ||
| fdt.c | ||
| gpio.c | ||
| i2c.c | ||
| interrupts.c | ||
| iop480_uart.c | ||
| kgdb.S | ||
| Makefile | ||
| miiphy.c | ||
| ndfc.c | ||
| resetvec.S | ||
| sdram.c | ||
| sdram.h | ||
| speed.c | ||
| start.S | ||
| tlb.c | ||
| traps.c | ||
| usb_ohci.c | ||
| usb_ohci.h | ||
| usb.c | ||
| usbdev.c | ||
| usbdev.h | ||
| vecnum.h | ||