MAINTAINERS | 2 + docs/system/riscv/tt_atlantis.rst | 1 + hw/misc/meson.build | 1 + hw/misc/trace-events | 4 + hw/misc/tt_atlantis_prcm.c | 428 +++++++++++++++++++++++++++++++++++++ hw/riscv/tt_atlantis.c | 125 ++++++++++- include/hw/misc/tt_atlantis_prcm.h | 51 +++++ include/hw/riscv/tt_atlantis.h | 28 +++ 8 files changed, 632 insertions(+), 8 deletions(-)
This series adds a qemu model for the PRCM blocks present in Tenstorrent
Atlantis. This block controls clock, reset and other misc functionality
in the SoC. Linux support for the Clocks/Resets served by the RCPU PRCM
was added in [1]. This PRCM model has been tested with a linux DT that
enables the PRCM and sets the UART clk to the one provided by the PRCM.
This DT will be sent out shortly.
[1] https://lore.kernel.org/linux-riscv/20260306-atlantis-clocks-v8-0-6c9b14a4aa8e@oss.tenstorrent.com/
Signed-off-by: Anirudh Srinivasan <asrinivasan@oss.tenstorrent.com>
---
Changes in v4:
- Addressed style comments from Joel's review
- Added error handling for sysbus_realize calls
- Dropped redundant realize/ops setting lines for PRCM subclasses
- Updated PRCM min_access_size to allow byte accesses
- Added back clock-frequency prop to UART node to allow linux boots without clk driver
- Added back bus clock-frequency prop to I2C node
- Link to v3: https://lore.kernel.org/qemu-devel/20260904-atlantis_prcm-v3-0-8bf20795a381@oss.tenstorrent.com
Changes in v3:
- Rebase on top of Joel's socify series v3 https://lore.kernel.org/qemu-riscv/20260903055131.257903-1-joel@jms.id.au/T/#t
- I2C and UART now use clk provided by PRCM, and periph_clk is dropped
- Addressed style edit comments from Joel (comment about clk IDs coming from DT bindings,) and Alistair (drop size from trace prints, move decalartions to top of function, use PRCM_DOMAIN enums)
- Link to v2: https://lore.kernel.org/qemu-devel/20260817-atlantis_prcm-v2-0-ffba0b944419@oss.tenstorrent.com
Changes in v2:
- Coding style edits based on Chao Liu's feedback
- Changed prcm to use Resettable inferface instead of legacy reset
- Edits requested by Daniel related to tracing, pll_en logic and unnecessary switch/case statement
- Added comments to some of the magic numbers in the reset values for PRCM registers
- Link to v1: https://lore.kernel.org/qemu-devel/20260729-atlantis_prcm-v1-0-502882933e51@oss.tenstorrent.com
---
Anirudh Srinivasan (3):
hw/misc: Add Tenstorrent Atlantis PRCM model
hw/riscv/tt-atlantis: Add PRCMs to tt-atlantis model
hw/riscv/tt-atlantis: Update UART and I2C to use clk from PRCM
MAINTAINERS | 2 +
docs/system/riscv/tt_atlantis.rst | 1 +
hw/misc/meson.build | 1 +
hw/misc/trace-events | 4 +
hw/misc/tt_atlantis_prcm.c | 428 +++++++++++++++++++++++++++++++++++++
hw/riscv/tt_atlantis.c | 125 ++++++++++-
include/hw/misc/tt_atlantis_prcm.h | 51 +++++
include/hw/riscv/tt_atlantis.h | 28 +++
8 files changed, 632 insertions(+), 8 deletions(-)
---
base-commit: b23a62773a7856299cbb3782e64968b6a92c792f
change-id: 20260727-atlantis_prcm-b642cfb37d57
Best regards,
--
Anirudh Srinivasan <asrinivasan@oss.tenstorrent.com>
On Thu, 2026-10-01 at 08:52 -0500, Anirudh Srinivasan wrote: > This series adds a qemu model for the PRCM blocks present in > Tenstorrent > Atlantis. This block controls clock, reset and other misc > functionality > in the SoC. Linux support for the Clocks/Resets served by the RCPU > PRCM > was added in [1]. This PRCM model has been tested with a linux DT > that > enables the PRCM and sets the UART clk to the one provided by the > PRCM. > This DT will be sent out shortly. > > [1] > https://lore.kernel.org/linux-riscv/20260306-atlantis-clocks-v8-0-6c9b14a4aa8e@oss.tenstorrent.com/ > > Signed-off-by: Anirudh Srinivasan <asrinivasan@oss.tenstorrent.com> Thanks! Applied to riscv-to-apply.next Alistair > --- > Changes in v4: > - Addressed style comments from Joel's review > - Added error handling for sysbus_realize calls > - Dropped redundant realize/ops setting lines for PRCM subclasses > - Updated PRCM min_access_size to allow byte accesses > - Added back clock-frequency prop to UART node to allow linux boots > without clk driver > - Added back bus clock-frequency prop to I2C node > - Link to v3: > https://lore.kernel.org/qemu-devel/20260904-atlantis_prcm-v3-0-8bf20795a381@oss.tenstorrent.com > > Changes in v3: > - Rebase on top of Joel's socify series v3 > https://lore.kernel.org/qemu-riscv/20260903055131.257903-1-joel@jms.id.au/T/#t > - I2C and UART now use clk provided by PRCM, and periph_clk is > dropped > - Addressed style edit comments from Joel (comment about clk IDs > coming from DT bindings,) and Alistair (drop size from trace prints, > move decalartions to top of function, use PRCM_DOMAIN enums) > - Link to v2: > https://lore.kernel.org/qemu-devel/20260817-atlantis_prcm-v2-0-ffba0b944419@oss.tenstorrent.com > > Changes in v2: > - Coding style edits based on Chao Liu's feedback > - Changed prcm to use Resettable inferface instead of legacy reset > - Edits requested by Daniel related to tracing, pll_en logic and > unnecessary switch/case statement > - Added comments to some of the magic numbers in the reset values for > PRCM registers > - Link to v1: > https://lore.kernel.org/qemu-devel/20260729-atlantis_prcm-v1-0-502882933e51@oss.tenstorrent.com > > --- > Anirudh Srinivasan (3): > hw/misc: Add Tenstorrent Atlantis PRCM model > hw/riscv/tt-atlantis: Add PRCMs to tt-atlantis model > hw/riscv/tt-atlantis: Update UART and I2C to use clk from PRCM > > MAINTAINERS | 2 + > docs/system/riscv/tt_atlantis.rst | 1 + > hw/misc/meson.build | 1 + > hw/misc/trace-events | 4 + > hw/misc/tt_atlantis_prcm.c | 428 > +++++++++++++++++++++++++++++++++++++ > hw/riscv/tt_atlantis.c | 125 ++++++++++- > include/hw/misc/tt_atlantis_prcm.h | 51 +++++ > include/hw/riscv/tt_atlantis.h | 28 +++ > 8 files changed, 632 insertions(+), 8 deletions(-) > --- > base-commit: b23a62773a7856299cbb3782e64968b6a92c792f > change-id: 20260727-atlantis_prcm-b642cfb37d57 > > Best regards, > -- > Anirudh Srinivasan <asrinivasan@oss.tenstorrent.com> >
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