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* hw: allwinner-i2c: Fix TWI_CNTR_INT_FLAG on SUN6i SoCsqianfan Zhao2023-03-061-0/+6
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | TWI_CNTR_INT_FLAG is W1C(write 1 to clear and write 0 has non-effect) register on SUN6i based SoCs, we should lower interrupt when the guest set this bit. The linux kernel will hang in irq handler(mv64xxx_i2c_intr) if no device connected on the i2c bus, next is the trace log: allwinner_i2c_write write CNTR(0x0c): 0xc4 A_ACK BUS_EN INT_EN allwinner_i2c_write write CNTR(0x0c): 0xcc A_ACK INT_FLAG BUS_EN INT_EN allwinner_i2c_read read CNTR(0x0c): 0xcc A_ACK INT_FLAG BUS_EN INT_EN allwinner_i2c_read read STAT(0x10): 0x20 STAT_M_ADDR_WR_NACK allwinner_i2c_write write CNTR(0x0c): 0x54 A_ACK M_STP BUS_EN allwinner_i2c_write write CNTR(0x0c): 0x4c A_ACK INT_FLAG BUS_EN allwinner_i2c_read read CNTR(0x0c): 0x4c A_ACK INT_FLAG BUS_EN allwinner_i2c_read read STAT(0x10): 0xf8 STAT_IDLE allwinner_i2c_write write CNTR(0x0c): 0x54 A_ACK M_STP BUS_EN allwinner_i2c_write write CNTR(0x0c): 0x4c A_ACK INT_FLAG BUS_EN allwinner_i2c_read read CNTR(0x0c): 0x4c A_ACK INT_FLAG BUS_EN allwinner_i2c_read read STAT(0x10): 0xf8 STAT_IDLE ... Fix it. Signed-off-by: qianfan Zhao <qianfanguijin@163.com> Reviewed-by: Strahinja Jankovic <strahinja.p.jankovic@gmail.com> Tested-by: Strahinja Jankovic <strahinja.p.jankovic@gmail.com> Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
* {hw/i2c,docs/system/arm}: Allwinner TWI/I2C EmulationStrahinja Jankovic2023-01-121-0/+55
This patch implements Allwinner TWI/I2C controller emulation. Only master-mode functionality is implemented. The SPL boot for Cubieboard expects AXP209 PMIC on TWI0/I2C0 bus, so this is first part enabling the TWI/I2C bus operation. Since both Allwinner A10 and H3 use the same module, it is added for both boards. Docs are also updated for Cubieboard and Orangepi-PC board to indicate I2C availability. Signed-off-by: Strahinja Jankovic <strahinja.p.jankovic@gmail.com> Reviewed-by: Niek Linnenbank <nieklinnenbank@gmail.com> Message-id: 20221226220303.14420-4-strahinja.p.jankovic@gmail.com Signed-off-by: Peter Maydell <peter.maydell@linaro.org>