diff options
| author | Cédric Le Goater <clg@kaod.org> | 2022-08-17 17:08:18 +0200 |
|---|---|---|
| committer | Daniel Henrique Barboza <danielhb413@gmail.com> | 2022-08-31 14:08:06 -0300 |
| commit | 629cae617039e03d5bfdc0120ade69135a009d33 (patch) | |
| tree | d6a696bf72e8a27017b89b6674eb7efa1a766bf0 /include | |
| parent | b42ad437562f72b31e5743db4ddf183a8e810eb2 (diff) | |
ppc/ppc4xx: Introduce a DCR device model
The Device Control Registers (DCR) of on-SoC devices are accessed by
software through the use of the mtdcr and mfdcr instructions. These
are converted in transactions on a side band bus, the DCR bus, which
connects the on-SoC devices to the CPU.
Ideally, we should model these accesses with a DCR namespace and DCR
memory regions but today the DCR handlers are installed in a DCR table
under the CPU. Instead, introduce a little device model wrapper to hold
a CPU link and handle registration of DCR handlers.
The DCR device inherits from SysBus because most of these devices also
have MMIO regions and/or IRQs. Being a SysBusDevice makes things easier
to install the device model in the overall SoC.
Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
[balaton: Explicit opaque parameter for dcr callbacks]
Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
Message-Id: <9b21bdf55e0a728f093bad299e030d98f302ded0.1660746880.git.balaton@eik.bme.hu>
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/hw/ppc/ppc4xx.h | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/include/hw/ppc/ppc4xx.h b/include/hw/ppc/ppc4xx.h index 591e2421a3..a537a5567b 100644 --- a/include/hw/ppc/ppc4xx.h +++ b/include/hw/ppc/ppc4xx.h @@ -27,6 +27,7 @@ #include "hw/ppc/ppc.h" #include "exec/memory.h" +#include "hw/sysbus.h" void ppc4xx_sdram_banks(MemoryRegion *ram, int nr_banks, MemoryRegion ram_memories[], @@ -44,4 +45,20 @@ void ppc4xx_mal_init(CPUPPCState *env, uint8_t txcnum, uint8_t rxcnum, #define TYPE_PPC4xx_PCI_HOST_BRIDGE "ppc4xx-pcihost" +/* + * Generic DCR device + */ +#define TYPE_PPC4xx_DCR_DEVICE "ppc4xx-dcr-device" +OBJECT_DECLARE_SIMPLE_TYPE(Ppc4xxDcrDeviceState, PPC4xx_DCR_DEVICE); +struct Ppc4xxDcrDeviceState { + SysBusDevice parent_obj; + + PowerPCCPU *cpu; +}; + +void ppc4xx_dcr_register(Ppc4xxDcrDeviceState *dev, int dcrn, void *opaque, + dcr_read_cb dcr_read, dcr_write_cb dcr_write); +bool ppc4xx_dcr_realize(Ppc4xxDcrDeviceState *dev, PowerPCCPU *cpu, + Error **errp); + #endif /* PPC4XX_H */ |