[U-Boot] [PATCH] mailbox: add Tegra186 HSP driver
Simon Glass
sjg at chromium.org
Sat May 14 23:22:26 CEST 2016
Hi Stephen,
On 13 May 2016 at 15:52, Stephen Warren <swarren at wwwdotorg.org> wrote:
> From: Stephen Warren <swarren at nvidia.com>
>
> Tegra186's HSP module implements doorbells, mailboxes, semaphores, and
> shared interrupts. This patch provides a driver for HSP, and hooks it
> into the mailbox API. Currently, only doorbells are supported.
>
> Signed-off-by: Stephen Warren <swarren at nvidia.com>
> ---
> This patch depends on:
> 1) "Add a mailbox driver framework/uclass"
> 2) "ARM: tegra: add core Tegra186 support"
>
> arch/arm/dts/tegra186.dtsi | 13 +++
> arch/arm/mach-tegra/Kconfig | 2 +
> drivers/mailbox/Kconfig | 7 ++
> drivers/mailbox/Makefile | 1 +
> drivers/mailbox/tegra-hsp.c | 163 ++++++++++++++++++++++++++++++++
> include/dt-bindings/mailbox/tegra-hsp.h | 14 +++
> 6 files changed, 200 insertions(+)
> create mode 100644 drivers/mailbox/tegra-hsp.c
> create mode 100644 include/dt-bindings/mailbox/tegra-hsp.h
Reviewed-by: Simon Glass <sjg at chromium.org>
Comment below.
>
> diff --git a/arch/arm/dts/tegra186.dtsi b/arch/arm/dts/tegra186.dtsi
> index 18b6a2664349..fce34fa6500e 100644
> --- a/arch/arm/dts/tegra186.dtsi
> +++ b/arch/arm/dts/tegra186.dtsi
> @@ -1,6 +1,7 @@
> #include "skeleton.dtsi"
> #include <dt-bindings/gpio/tegra-gpio.h>
> #include <dt-bindings/interrupt-controller/arm-gic.h>
> +#include <dt-bindings/mailbox/tegra-hsp.h>
>
> / {
> compatible = "nvidia,tegra186";
> @@ -40,6 +41,18 @@
> status = "disabled";
> };
>
> + hsp: hsp at 3c00000 {
> + compatible = "nvidia,tegra186-hsp";
> + reg = <0x0 0x03c00000 0x0 0xa0000>;
> + interrupts = <GIC_SPI 176 IRQ_TYPE_LEVEL_HIGH>;
> + nvidia,num-SM = <0x8>;
> + nvidia,num-AS = <0x2>;
> + nvidia,num-SS = <0x2>;
> + nvidia,num-DB = <0x7>;
> + nvidia,num-SI = <0x8>;
> + #mbox-cells = <1>;
> + };
> +
> gpio at c2f0000 {
> compatible = "nvidia,tegra186-gpio-aon";
> reg-names = "security", "gpio";
> diff --git a/arch/arm/mach-tegra/Kconfig b/arch/arm/mach-tegra/Kconfig
> index b18a12e34203..f4affa5512bc 100644
> --- a/arch/arm/mach-tegra/Kconfig
> +++ b/arch/arm/mach-tegra/Kconfig
> @@ -56,8 +56,10 @@ config TEGRA210
>
> config TEGRA186
> bool "Tegra186 family"
> + select DM_MAILBOX
> select TEGRA186_GPIO
> select TEGRA_ARMV8_COMMON
> + select TEGRA_HSP
>
> endchoice
>
> diff --git a/drivers/mailbox/Kconfig b/drivers/mailbox/Kconfig
> index 295e6db0f28c..8ae8edd28c52 100644
> --- a/drivers/mailbox/Kconfig
> +++ b/drivers/mailbox/Kconfig
> @@ -10,4 +10,11 @@ config DM_MAILBOX
> the basis of a variety of inter-process/inter-CPU communication
> protocols.
>
> +config TEGRA_HSP
> + bool "Enable Tegra HSP controller support"
> + depends on DM_MAILBOX && TEGRA
> + help
> + This enables support for the NVIDIA Tegra HSP Hw module, which
> + implements doorbells, mailboxes, semaphores, and shared interrupts.
> +
> endmenu
> diff --git a/drivers/mailbox/Makefile b/drivers/mailbox/Makefile
> index a2d96a4e3b98..b5bc84032573 100644
> --- a/drivers/mailbox/Makefile
> +++ b/drivers/mailbox/Makefile
> @@ -3,3 +3,4 @@
> # SPDX-License-Identifier: GPL-2.0
>
> obj-$(CONFIG_DM_MAILBOX) += mailbox-uclass.o
> +obj-$(CONFIG_TEGRA_HSP) += tegra-hsp.o
> diff --git a/drivers/mailbox/tegra-hsp.c b/drivers/mailbox/tegra-hsp.c
> new file mode 100644
> index 000000000000..2d7aef21c036
> --- /dev/null
> +++ b/drivers/mailbox/tegra-hsp.c
> @@ -0,0 +1,163 @@
> +/*
> + * Copyright (c) 2016, NVIDIA CORPORATION.
> + *
> + * SPDX-License-Identifier: GPL-2.0
> + */
> +
> +#include <common.h>
> +#include <asm/io.h>
> +#include <dm.h>
> +#include <mailbox_uclass.h>
> +#include <dt-bindings/mailbox/tegra-hsp.h>
> +
> +#define TEGRA_HSP_DB_REG_TRIGGER 0x0
> +#define TEGRA_HSP_DB_REG_ENABLE 0x4
> +#define TEGRA_HSP_DB_REG_RAW 0x8
> +#define TEGRA_HSP_DB_REG_PENDING 0xc
> +
> +#define TEGRA_HSP_DB_ID_CCPLEX 1
> +#define TEGRA_HSP_DB_ID_BPMP 3
> +#define TEGRA_HSP_DB_ID_NUM 7
> +
> +struct tegra_hsp {
> + fdt_addr_t regs;
> + uint32_t db_base;
> +};
> +
> +DECLARE_GLOBAL_DATA_PTR;
> +
> +static uint32_t *tegra_hsp_reg(struct tegra_hsp *thsp, uint32_t db_id,
> + uint32_t reg)
> +{
> + return (uint32_t *)(thsp->regs + thsp->db_base + (db_id * 0x100) + reg);
> +}
> +
> +static uint32_t tegra_hsp_readl(struct tegra_hsp *thsp, uint32_t db_id,
> + uint32_t reg)
> +{
> + uint32_t *r = tegra_hsp_reg(thsp, db_id, reg);
> + return readl(r);
> +}
> +
> +static void tegra_hsp_writel(struct tegra_hsp *thsp, uint32_t val,
> + uint32_t db_id, uint32_t reg)
> +{
> + uint32_t *r = tegra_hsp_reg(thsp, db_id, reg);
I think it would be better to resolve the register set once in the
caller and then access the different members. It does feel a bit
obfuscated. But since this driver is so trivial I don't think it
matters.
> +
> + writel(val, r);
> + readl(r);
> +}
> +
> +static int tegra_hsp_db_id(ulong chan_id)
> +{
> + switch (chan_id) {
> + case TEGRA_HSP_MASTER_BPMP:
> + return TEGRA_HSP_DB_ID_BPMP;
> + default:
> + debug("Invalid channel ID\n");
> + return -EINVAL;
> + }
> +}
> +
> +static int tegra_hsp_request(struct mbox_chan *chan)
> +{
> + int db_id;
> +
> + debug("%s(chan=%p)\n", __func__, chan);
> +
> + db_id = tegra_hsp_db_id(chan->id);
> + if (db_id < 0) {
> + debug("tegra_hsp_db_id() failed: %d\n", db_id);
> + return -EINVAL;
> + }
> +
> + return 0;
> +}
> +
> +static int tegra_hsp_free(struct mbox_chan *chan)
> +{
> + debug("%s(chan=%p)\n", __func__, chan);
> +
> + return 0;
> +}
> +
> +static int tegra_hsp_send(struct mbox_chan *chan, const void *data)
> +{
> + struct tegra_hsp *thsp = dev_get_priv(chan->dev);
> + int db_id;
> +
> + debug("%s(chan=%p, data=%p)\n", __func__, chan, data);
> +
> + db_id = tegra_hsp_db_id(chan->id);
> + tegra_hsp_writel(thsp, 1, db_id, TEGRA_HSP_DB_REG_TRIGGER);
> +
> + return 0;
> +}
> +
> +static int tegra_hsp_recv(struct mbox_chan *chan, void *data)
> +{
> + struct tegra_hsp *thsp = dev_get_priv(chan->dev);
> + uint32_t db_id = TEGRA_HSP_DB_ID_CCPLEX;
> + uint32_t val;
> +
> + debug("%s(chan=%p, data=%p)\n", __func__, chan, data);
> +
> + val = tegra_hsp_readl(thsp, db_id, TEGRA_HSP_DB_REG_RAW);
> + if (!(val & BIT(chan->id)))
> + return -ENODATA;
> +
> + tegra_hsp_writel(thsp, BIT(chan->id), db_id, TEGRA_HSP_DB_REG_RAW);
> +
> + return 0;
> +}
> +
> +static int tegra_hsp_bind(struct udevice *dev)
> +{
> + debug("%s(dev=%p)\n", __func__, dev);
> +
> + return 0;
> +}
> +
> +static int tegra_hsp_probe(struct udevice *dev)
> +{
> + struct tegra_hsp *thsp = dev_get_priv(dev);
> + int nr_sm, nr_ss, nr_as;
> +
> + debug("%s(dev=%p)\n", __func__, dev);
> +
> + thsp->regs = dev_get_addr(dev);
> + if (thsp->regs == FDT_ADDR_T_NONE)
> + return -ENODEV;
> +
> + nr_sm = fdtdec_get_int(gd->fdt_blob, dev->of_offset, "nvidia,num-SM",
> + 0);
> + nr_ss = fdtdec_get_int(gd->fdt_blob, dev->of_offset, "nvidia,num-SS",
> + 0);
> + nr_as = fdtdec_get_int(gd->fdt_blob, dev->of_offset, "nvidia,num-AS",
> + 0);
> + thsp->db_base = (1 + (nr_sm >> 1) + nr_ss + nr_as) << 16;
> +
> + return 0;
> +}
> +
> +static const struct udevice_id tegra_hsp_ids[] = {
> + { .compatible = "nvidia,tegra186-hsp" },
> + { }
> +};
> +
> +struct mbox_ops tegra_hsp_mbox_ops = {
> + .request = tegra_hsp_request,
> + .free = tegra_hsp_free,
> + .send = tegra_hsp_send,
> + .recv = tegra_hsp_recv,
> +};
> +
> +U_BOOT_DRIVER(tegra_hsp) = {
> + .name = "tegra-hsp",
> + .id = UCLASS_MAILBOX,
> + .of_match = tegra_hsp_ids,
> + .bind = tegra_hsp_bind,
> + .probe = tegra_hsp_probe,
> + .priv_auto_alloc_size = sizeof(struct tegra_hsp),
> + .ops = &tegra_hsp_mbox_ops,
> +};
> diff --git a/include/dt-bindings/mailbox/tegra-hsp.h b/include/dt-bindings/mailbox/tegra-hsp.h
> new file mode 100644
> index 000000000000..e8c23fa91d23
> --- /dev/null
> +++ b/include/dt-bindings/mailbox/tegra-hsp.h
> @@ -0,0 +1,14 @@
> +/*
> + * This header provides constants for binding nvidia,tegra186-hsp.
> + *
> + * The number with TEGRA_HSP_MASTER prefix indicates the bit that is
> + * associated with a master ID in the doorbell registers.
> + */
> +
> +#ifndef _DT_BINDINGS_MAILBOX_TEGRA186_HSP_H
> +#define _DT_BINDINGS_MAILBOX_TEGRA186_HSP_H
> +
> +#define TEGRA_HSP_MASTER_CCPLEX 17
> +#define TEGRA_HSP_MASTER_BPMP 19
> +
> +#endif
> --
> 2.8.2
>
Regards,
Simon
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