arch/risc-v/k210: Remove QEMU support

Remove the CONFIG_K210_WITH_QEMU option and associated conditional
code paths. The reasons for removal are:

* Simplifies code path for real hardware by removing QEMU workarounds
* The current QEMU target uses sifive_u machine, which is not designed
  for K210 emulation
* For RISC-V QEMU simulation, the qemu-rv (rv-virt) target is a better
  choice
* Renode can be used as an alternative for K210 simulation if needed

Signed-off-by: Huang Qi <huangqi3@xiaomi.com>

.github/CODEOWNERS

@@ -687,7 +687,6 @@ Documentation/platforms/risc-v/hpm6750/index.rst raiden00@railab.me
 Documentation/platforms/risc-v/index.rst matias@protobits.dev
 Documentation/platforms/risc-v/jh7110/boards/star64/index.rst luppy@appkaki.com
 Documentation/platforms/risc-v/jh7110/index.rst luppy@appkaki.com
-Documentation/platforms/risc-v/k210/boards/maix-bit/README-qemu.txt raiden00@railab.me
 Documentation/platforms/risc-v/k210/boards/maix-bit/README.txt raiden00@railab.me
 Documentation/platforms/risc-v/k210/boards/maix-bit/index.rst raiden00@railab.me
 Documentation/platforms/risc-v/k210/index.rst raiden00@railab.me

Documentation/platforms/risc-v/k210/boards/maix-bit/index.rst

@@ -30,7 +30,7 @@ Features
 
 .. todo::
 
-   If you are intersted in using this board, please consider contributing
+   If you are interested in using this board, please consider contributing
    implementations for the above missing features.
 
 Installation
@@ -77,51 +77,6 @@ Write ``nuttx.bin`` to SPI-Flash:
 
    The ``kflash_gui`` is not recommended because it's unstable.
 
-QEMU Process
-============
-
-In order to run this board's version of NuttX on QEMU, make the following
-adjustments:
-
-QEMU Installation
------------------
-
-Installing and building QEMU can be done with:
-
-.. code:: console
-
-   $ git clone https://github.com/qemu/qemu
-   $ cd qemu
-   $ ./configure --target-list=riscv64-softmmu
-   $ make
-   $ sudo make install
-
-Building NuttX for QEMU
------------------------
-
-Building NuttX follows the same process, but you will need to modify your chosen
-configuration to include the option ``CONFIG_K210_WITH_QEMU=y``.
-
-Running on QEMU
----------------
-
-Run the following:
-
-.. code:: console
-
-   $ qemu-system-riscv64 -nographic -machine sifive_u -bios ./nuttx
-
-
-.. note::
-
-   To run Nuttx for kostest, ``gdb`` needs to be used to load both
-   ``nuttx_user.elf`` and ``nuttx``.
-
-   .. code:: console
-
-      $ qemu-system-riscv64 -nographic -machine sifive_u -s -S
-      $ riscv64-unknown-elf-gdb -ex 'target extended-remote:1234' -ex 'load nuttx_user.elf' -ex 'load nuttx' -ex 'c'
-
 Configurations
 ==============
 

arch/risc-v/Kconfig

@@ -29,8 +29,8 @@ config ARCH_CHIP_K210
 	select ARCH_RV_ISA_M
 	select ARCH_RV_ISA_A
 	select ARCH_RV_ISA_C
-	select ARCH_HAVE_FPU if !K210_WITH_QEMU
-	select ARCH_HAVE_DPFPU if !K210_WITH_QEMU
+	select ARCH_HAVE_FPU
+	select ARCH_HAVE_DPFPU
 	select ARCH_HAVE_MPU
 	select ARCH_HAVE_TESTSET
 	select ARCH_HAVE_MULTICPU

arch/risc-v/include/k210/irq.h

@@ -33,13 +33,9 @@
 
 /* Map RISC-V exception code to NuttX IRQ */
 
-#ifdef CONFIG_K210_WITH_QEMU
-#define K210_IRQ_UART0    (RISCV_IRQ_MEXT + 4)
-#else
 #define K210_IRQ_WDT0     (RISCV_IRQ_MEXT + 21)
 #define K210_IRQ_WDT1     (RISCV_IRQ_MEXT + 22)
 #define K210_IRQ_UART0    (RISCV_IRQ_MEXT + 33)
-#endif
 
 /* Total number of IRQs */
 

arch/risc-v/src/k210/Kconfig

@@ -50,11 +50,3 @@ config K210_CPU_FREQ
 		Set the K210 CPU target frequency in Hz.
 		Default is 400000000 (400 MHz).
 		Valid range: 40000000-600000000 Hz (40-600 MHz).
-
-menu "K210 Others"
-
-config K210_WITH_QEMU
-	bool "qemu support"
-	default n
-
-endmenu

arch/risc-v/src/k210/hardware/k210_memorymap.h

@@ -32,11 +32,7 @@
 #define K210_CLINT_BASE   0x02000000
 #define K210_PLIC_BASE    0x0c000000
 
-#ifdef CONFIG_K210_WITH_QEMU
-#define K210_UART0_BASE   0x10010000
-#else
 #define K210_UART0_BASE   0x38000000
-#endif
 #define K210_GPIOHS_BASE  0x38001000
 #define K210_FPIOA_BASE   0x502B0000
 

arch/risc-v/src/k210/k210_clockconfig.c

@@ -66,7 +66,6 @@ uint32_t k210_get_cpuclk(void)
  * Name: k210_get_pll0clk
  ****************************************************************************/
 
-#ifndef CONFIG_K210_WITH_QEMU
 uint32_t k210_get_pll0clk(void)
 {
   uint32_t pll0;
@@ -81,7 +80,6 @@ uint32_t k210_get_pll0clk(void)
 
   return OSC_FREQ / nr * nf / od;
 }
-#endif
 
 /****************************************************************************
  * Name: k210_clockconfig
@@ -89,7 +87,6 @@ uint32_t k210_get_pll0clk(void)
 
 void k210_clockconfig(void)
 {
-#ifndef CONFIG_K210_WITH_QEMU
   uint32_t clksel0;
   uint32_t div;
 
@@ -133,5 +130,4 @@ void k210_clockconfig(void)
   /* Workaround for stabilization */
 
   up_udelay(1);
-#endif
 }

arch/risc-v/src/k210/k210_timerisr.c

@@ -46,11 +46,7 @@
  * Pre-processor Definitions
  ****************************************************************************/
 
-#ifdef CONFIG_K210_WITH_QEMU
-#define MTIMER_FREQ 1000000
-#else
 #define MTIMER_FREQ (k210_get_cpuclk() / 50)
-#endif
 
 /****************************************************************************
  * Public Functions

boards/Kconfig

@@ -1116,7 +1116,7 @@ config ARCH_BOARD_LX_CPU
 config ARCH_BOARD_MAIX_BIT
 	bool "Sipeed Maix Bit board"
 	depends on ARCH_CHIP_K210
-	select ARCH_HAVE_LEDS if !K210_WITH_QEMU
+	select ARCH_HAVE_LEDS
 	---help---
 		This is the board configuration for the port of NuttX to the
 		Sipeed Maix Bit board. This board features the RISC-V K210