[U-Boot] [PATCH V2 07/32] misc: add i.MX8 misc driver
Lokesh Vutla
lokeshvutla at ti.com
Wed Jul 18 09:04:49 UTC 2018
On Wednesday 18 July 2018 02:22 PM, Peng Fan wrote:
>
>
>> -----Original Message-----
>> From: Lokesh Vutla [mailto:lokeshvutla at ti.com]
>> Sent: 2018年7月18日 16:38
>> To: Peng Fan <peng.fan at nxp.com>; sbabic at denx.de; Fabio Estevam
>> <fabio.estevam at nxp.com>
>> Cc: u-boot at lists.denx.de; dl-linux-imx <linux-imx at nxp.com>
>> Subject: Re: [U-Boot] [PATCH V2 07/32] misc: add i.MX8 misc driver
>>
>>
>>
>> On Wednesday 18 July 2018 07:05 AM, Peng Fan wrote:
>>> Add i.MX8 MISC driver to handle the communication between
>>> A35 Core and SCU.
>>
>>
>> Ideally this is a good fit under drivers/remoteproc. Any reason why
>> UCLASS_REMOTEPROC is not considered?
>
> The SCU is booted by ROM, it provide services for other Cores.
Nice. I agree that it provide services for other cores. I am trying to
understand how the communication happens. So you must be writing into a
mailbox IP? Then drivers/mailbox should be used to send and receive
messages.
Thanks and regards,
Lokesh
> It is not like rpmsg things. I think the misc driver
> is a good fit for my case.
>
> I also see that Tegra BPMP driver using misc driver.
>
> Thanks,
> Peng.
>
>>
>> Thanks and regards,
>> Lokesh
>>
>>>
>>> Signed-off-by: Peng Fan <peng.fan at nxp.com>
>>> ---
>>> drivers/misc/Makefile | 1 +
>>> drivers/misc/imx8/Makefile | 3 +
>>> drivers/misc/imx8/scu.c | 247
>> +++++++++++++++++++++++++++++++++++++++++++++
>>> 3 files changed, 251 insertions(+)
>>> create mode 100644 drivers/misc/imx8/Makefile create mode 100644
>>> drivers/misc/imx8/scu.c
>>>
>>> diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile index
>>> 4ce9d213f0..c0de02c30d 100644
>>> --- a/drivers/misc/Makefile
>>> +++ b/drivers/misc/Makefile
>>> @@ -6,6 +6,7 @@
>>> obj-$(CONFIG_MISC) += misc-uclass.o
>>> obj-$(CONFIG_ALI152X) += ali512x.o
>>> obj-$(CONFIG_ALTERA_SYSID) += altera_sysid.o
>>> +obj-$(CONFIG_ARCH_IMX8) += imx8/
>>> obj-$(CONFIG_ATSHA204A) += atsha204a-i2c.o
>>> obj-$(CONFIG_DS4510) += ds4510.o
>>> obj-$(CONFIG_CBMEM_CONSOLE) += cbmem_console.o diff --git
>>> a/drivers/misc/imx8/Makefile b/drivers/misc/imx8/Makefile new file
>>> mode 100644 index 0000000000..3395340d22
>>> --- /dev/null
>>> +++ b/drivers/misc/imx8/Makefile
>>
>>> @@ -0,0 +1,3 @@
>>> +# SPDX-License-Identifier: GPL-2.0+
>>> +
>>> +obj-y += scu.o
>>> diff --git a/drivers/misc/imx8/scu.c b/drivers/misc/imx8/scu.c new
>>> file mode 100644 index 0000000000..f12c7a96f2
>>> --- /dev/null
>>> +++ b/drivers/misc/imx8/scu.c
>>> @@ -0,0 +1,247 @@
>>> +// SPDX-License-Identifier: GPL-2.0
>>> +/*
>>> + * Copyright 2018 NXP
>>> + *
>>> + * Peng Fan <peng.fan at nxp.com>
>>> + */
>>> +
>>> +#include <common.h>
>>> +#include <asm/io.h>
>>> +#include <dm.h>
>>> +#include <dm/lists.h>
>>> +#include <dm/root.h>
>>> +#include <dm/device-internal.h>
>>> +#include <asm/arch/sci/sci.h>
>>> +#include <linux/iopoll.h>
>>> +#include <misc.h>
>>> +
>>> +DECLARE_GLOBAL_DATA_PTR;
>>> +
>>> +struct mu_type {
>>> + u32 tr[4];
>>> + u32 rr[4];
>>> + u32 sr;
>>> + u32 cr;
>>> +};
>>> +
>>> +struct imx8_scu {
>>> + struct mu_type *base;
>>> + struct udevice *clk;
>>> + struct udevice *pinclk;
>>> +};
>>> +
>>> +#define MU_CR_GIE_MASK 0xF0000000u
>>> +#define MU_CR_RIE_MASK 0xF000000u
>>> +#define MU_CR_GIR_MASK 0xF0000u
>>> +#define MU_CR_TIE_MASK 0xF00000u
>>> +#define MU_CR_F_MASK 0x7u
>>> +#define MU_SR_TE0_MASK BIT(23)
>>> +#define MU_SR_RF0_MASK BIT(27)
>>> +#define MU_TR_COUNT 4
>>> +#define MU_RR_COUNT 4
>>> +static inline void mu_hal_init(struct mu_type *base) {
>>> + /* Clear GIEn, RIEn, TIEn, GIRn and ABFn. */
>>> + clrbits_le32(&base->cr, MU_CR_GIE_MASK | MU_CR_RIE_MASK |
>>> + MU_CR_TIE_MASK | MU_CR_GIR_MASK | MU_CR_F_MASK); }
>>> +
>>> +static int mu_hal_sendmsg(struct mu_type *base, u32 reg_index, u32
>>> +msg) {
>>> + u32 mask = MU_SR_TE0_MASK >> reg_index;
>>> + u32 val;
>>> + int ret;
>>> +
>>> + assert(reg_index < MU_TR_COUNT);
>>> +
>>> + /* Wait TX register to be empty. */
>>> + ret = readl_poll_timeout(&base->sr, val, val & mask, 10000);
>>> + if (ret < 0) {
>>> + printf("%s timeout\n", __func__);
>>> + return -ETIMEDOUT;
>>> + }
>>> +
>>> + writel(msg, &base->tr[reg_index]);
>>> +
>>> + return 0;
>>> +}
>>> +
>>> +static int mu_hal_receivemsg(struct mu_type *base, u32 reg_index, u32
>>> +*msg) {
>>> + u32 mask = MU_SR_RF0_MASK >> reg_index;
>>> + u32 val;
>>> + int ret;
>>> +
>>> + assert(reg_index < MU_TR_COUNT);
>>> +
>>> + /* Wait RX register to be full. */
>>> + ret = readl_poll_timeout(&base->sr, val, val & mask, 10000);
>>> + if (ret < 0) {
>>> + printf("%s timeout\n", __func__);
>>> + return -ETIMEDOUT;
>>> + }
>>> +
>>> + *msg = readl(&base->rr[reg_index]);
>>> +
>>> + return 0;
>>> +}
>>> +
>>> +static void sc_ipc_read(struct mu_type *base, void *data) {
>>> + struct sc_rpc_msg_s *msg = (struct sc_rpc_msg_s *)data;
>>> + u8 count = 0;
>>> +
>>> + /* Check parms */
>>> + if (!base || !msg)
>>> + return;
>>> +
>>> + /* Read first word */
>>> + mu_hal_receivemsg(base, 0, (u32 *)msg);
>>> + count++;
>>> +
>>> + /* Check size */
>>> + if (msg->size > SC_RPC_MAX_MSG) {
>>> + *((u32 *)msg) = 0;
>>> + return;
>>> + }
>>> +
>>> + /* Read remaining words */
>>> + while (count < msg->size) {
>>> + mu_hal_receivemsg(base, count % MU_RR_COUNT,
>>> + &msg->DATA.u32[count - 1]);
>>> + count++;
>>> + }
>>> +}
>>> +
>>> +static void sc_ipc_write(struct mu_type *base, void *data) {
>>> + struct sc_rpc_msg_s *msg = (struct sc_rpc_msg_s *)data;
>>> + u8 count = 0;
>>> +
>>> + /* Check parms */
>>> + if (!base || !msg)
>>> + return;
>>> +
>>> + /* Check size */
>>> + if (msg->size > SC_RPC_MAX_MSG)
>>> + return;
>>> +
>>> + /* Write first word */
>>> + mu_hal_sendmsg(base, 0, *((u32 *)msg));
>>> + count++;
>>> +
>>> + /* Write remaining words */
>>> + while (count < msg->size) {
>>> + mu_hal_sendmsg(base, count % MU_TR_COUNT,
>>> + msg->DATA.u32[count - 1]);
>>> + count++;
>>> + }
>>> +}
>>> +
>>> +/*
>>> + * Note the function prototype use msgid as the 2nd parameter, here
>>> + * we take it as no_resp.
>>> + */
>>> +static int imx8_scu_call(struct udevice *dev, int no_resp, void *tx_msg,
>>> + int tx_size, void *rx_msg, int rx_size) {
>>> + struct imx8_scu *priv = dev_get_priv(dev);
>>> + sc_err_t result;
>>> +
>>> + /* Expect tx_msg, rx_msg are the same value */
>>> + if (rx_msg && tx_msg != rx_msg)
>>> + printf("tx_msg %p, rx_msg %p\n", tx_msg, rx_msg);
>>> +
>>> + sc_ipc_write(priv->base, tx_msg);
>>> + if (!no_resp)
>>> + sc_ipc_read(priv->base, rx_msg);
>>> +
>>> + result = RPC_R8((sc_rpc_msg_t *)tx_msg);
>>> +
>>> + return sc_err_to_linux(result);
>>> +}
>>> +
>>> +static int imx8_scu_probe(struct udevice *dev) {
>>> + struct imx8_scu *priv = dev_get_priv(dev);
>>> + fdt_addr_t addr;
>>> +
>>> + debug("%s(dev=%p) (priv=%p)\n", __func__, dev, priv);
>>> +
>>> + addr = devfdt_get_addr(dev);
>>> + if (addr == FDT_ADDR_T_NONE)
>>> + return -EINVAL;
>>> +
>>> + priv->base = (struct mu_type *)addr;
>>> +
>>> + /* U-Boot not enable interrupts, so need to enable RX interrupts */
>>> + mu_hal_init(priv->base);
>>> +
>>> + gd->arch.scu_dev = dev;
>>> +
>>> + device_probe(priv->clk);
>>> + device_probe(priv->pinclk);
>>> +
>>> + return 0;
>>> +}
>>> +
>>> +static int imx8_scu_remove(struct udevice *dev) {
>>> + return 0;
>>> +}
>>> +
>>> +static int imx8_scu_bind(struct udevice *dev) {
>>> + struct imx8_scu *priv = dev_get_priv(dev);
>>> + int ret;
>>> + struct udevice *child;
>>> + int node;
>>> +
>>> + debug("%s(dev=%p)\n", __func__, dev);
>>> +
>>> + node = fdt_node_offset_by_compatible(gd->fdt_blob, -1,
>>> + "fsl,imx8qxp-clk");
>>> + if (node < 0)
>>> + panic("No clk node found\n");
>>> +
>>> + ret = lists_bind_fdt(dev, offset_to_ofnode(node), &child);
>>> + if (ret)
>>> + return ret;
>>> +
>>> + priv->clk = child;
>>> +
>>> + node = fdt_node_offset_by_compatible(gd->fdt_blob, -1,
>>> + "fsl,imx8qxp-iomuxc");
>>> + if (node < 0)
>>> + panic("No clk node found\n");
>>> +
>>> + ret = lists_bind_fdt(dev, offset_to_ofnode(node), &child);
>>> + if (ret)
>>> + return ret;
>>> +
>>> + priv->pinclk = child;
>>> +
>>> + return 0;
>>> +}
>>> +
>>> +static struct misc_ops imx8_scu_ops = {
>>> + .call = imx8_scu_call,
>>> +};
>>> +
>>> +static const struct udevice_id imx8_scu_ids[] = {
>>> + { .compatible = "fsl,imx8qxp-mu" },
>>> + { .compatible = "fsl,imx8-mu" },
>>> + { }
>>> +};
>>> +
>>> +U_BOOT_DRIVER(imx8_scu) = {
>>> + .name = "imx8_scu",
>>> + .id = UCLASS_MISC,
>>> + .of_match = imx8_scu_ids,
>>> + .probe = imx8_scu_probe,
>>> + .bind = imx8_scu_bind,
>>> + .remove = imx8_scu_remove,
>>> + .ops = &imx8_scu_ops,
>>> + .priv_auto_alloc_size = sizeof(struct imx8_scu),
>>> + .flags = DM_FLAG_PRE_RELOC,
>>> +};
>>>
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