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Message-ID: <28f1f1bf-d490-2630-d41f-1344baa0eea9@redhat.com>
Date: Mon, 16 Jan 2023 19:28:54 +0100
From: Marco Pagani <marpagan@...hat.com>
To: Matthew Gerlach <matthew.gerlach@...ux.intel.com>
Cc: andriy.shevchenko@...ux.intel.com, bagasdotme@...il.com,
basheer.ahmed.muddebihal@...el.com, corbet@....net,
geert+renesas@...der.be, gregkh@...uxfoundation.org,
hao.wu@...el.com, ilpo.jarvinen@...ux.intel.com,
jirislaby@...nel.org, johan@...nel.org, linux-doc@...r.kernel.org,
linux-fpga@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-serial@...r.kernel.org, lukas@...ner.de, macro@...am.me.uk,
marpagan@...hat.com, mdf@...nel.org,
niklas.soderlund+renesas@...natech.se, russell.h.weight@...el.com,
tianfei.zhang@...el.com, trix@...hat.com, yilun.xu@...el.com
Subject: Re: [PATCH v11 4/4] tty: serial: 8250: add DFL bus driver for Altera
16550.
On 2023-01-15 16:14, matthew.gerlach@...ux.intel.com wrote:
> From: Matthew Gerlach <matthew.gerlach@...ux.intel.com>
>
> Add a Device Feature List (DFL) bus driver for the Altera
> 16550 implementation of UART.
>
> Signed-off-by: Matthew Gerlach <matthew.gerlach@...ux.intel.com>
> Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
> Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Reviewed-by: Marco Pagani <marpagan@...hat.com>
> ---
> v11: sizeof(u64) -> sizeof(*pval)
> 16650 -> 16550
>
> v10: track change to dfh_find_param()
>
> v9: add Rb Andy Shevchenko
> move dfh_get_u64_param_vals to static version of dfh_get_u64_param_val
>
> v8: use dfh_get_u64_param_vals()
>
> v7: no change
>
> v6: move driver specific parameter definitions to limit scope
>
> v5: removed unneeded blank line
> removed unneeded includes
> included device.h and types.h
> removed unneeded local variable
> remove calls to dev_dbg
> memset -> { }
> remove space after period
> explicitly include used headers
> remove redundant Inc from Copyright
> fix format specifier
>
> v4: use dev_err_probe() everywhere that is appropriate
> clean up noise
> change error messages to use the word, unsupported
> tried again to sort Makefile and KConfig better
> reorder probe function for easier error handling
> use new dfh_find_param API
>
> v3: use passed in location of registers
> use cleaned up functions for parsing parameters
>
> v2: clean up error messages
> alphabetize header files
> fix 'missing prototype' error by making function static
> tried to sort Makefile and Kconfig better
> ---
> drivers/tty/serial/8250/8250_dfl.c | 167 +++++++++++++++++++++++++++++
> drivers/tty/serial/8250/Kconfig | 12 +++
> drivers/tty/serial/8250/Makefile | 1 +
> 3 files changed, 180 insertions(+)
> create mode 100644 drivers/tty/serial/8250/8250_dfl.c
>
> diff --git a/drivers/tty/serial/8250/8250_dfl.c b/drivers/tty/serial/8250/8250_dfl.c
> new file mode 100644
> index 000000000000..6c5ff019df4b
> --- /dev/null
> +++ b/drivers/tty/serial/8250/8250_dfl.c
> @@ -0,0 +1,167 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Driver for FPGA UART
> + *
> + * Copyright (C) 2022 Intel Corporation.
> + *
> + * Authors:
> + * Ananda Ravuri <ananda.ravuri@...el.com>
> + * Matthew Gerlach <matthew.gerlach@...ux.intel.com>
> + */
> +
> +#include <linux/bitfield.h>
> +#include <linux/device.h>
> +#include <linux/dfl.h>
> +#include <linux/errno.h>
> +#include <linux/ioport.h>
> +#include <linux/module.h>
> +#include <linux/mod_devicetable.h>
> +#include <linux/types.h>
> +
> +#include <linux/serial.h>
> +#include <linux/serial_8250.h>
> +
> +#define DFHv1_PARAM_ID_CLK_FRQ 0x2
> +#define DFHv1_PARAM_ID_FIFO_LEN 0x3
> +
> +#define DFHv1_PARAM_ID_REG_LAYOUT 0x4
> +#define DFHv1_PARAM_REG_LAYOUT_WIDTH GENMASK_ULL(63, 32)
> +#define DFHv1_PARAM_REG_LAYOUT_SHIFT GENMASK_ULL(31, 0)
> +
> +struct dfl_uart {
> + int line;
> +};
> +
> +static int dfh_get_u64_param_val(struct dfl_device *dfl_dev, int param_id, u64 *pval)
> +{
> + size_t psize;
> + u64 *p;
> +
> + p = dfh_find_param(dfl_dev, param_id, &psize);
> + if (IS_ERR(p))
> + return PTR_ERR(p);
> +
> + if (psize != sizeof(*pval))
> + return -EINVAL;
> +
> + *pval = *p;
> +
> + return 0;
> +}
> +
> +static int dfl_uart_get_params(struct dfl_device *dfl_dev, struct uart_8250_port *uart)
> +{
> + struct device *dev = &dfl_dev->dev;
> + u64 fifo_len, clk_freq, reg_layout;
> + u32 reg_width;
> + int ret;
> +
> + ret = dfh_get_u64_param_val(dfl_dev, DFHv1_PARAM_ID_CLK_FRQ, &clk_freq);
> + if (ret)
> + return dev_err_probe(dev, ret, "missing CLK_FRQ param\n");
> +
> + uart->port.uartclk = clk_freq;
> +
> + ret = dfh_get_u64_param_val(dfl_dev, DFHv1_PARAM_ID_FIFO_LEN, &fifo_len);
> + if (ret)
> + return dev_err_probe(dev, ret, "missing FIFO_LEN param\n");
> +
> + switch (fifo_len) {
> + case 32:
> + uart->port.type = PORT_ALTR_16550_F32;
> + break;
> +
> + case 64:
> + uart->port.type = PORT_ALTR_16550_F64;
> + break;
> +
> + case 128:
> + uart->port.type = PORT_ALTR_16550_F128;
> + break;
> +
> + default:
> + return dev_err_probe(dev, -EINVAL, "unsupported FIFO_LEN %llu\n", fifo_len);
> + }
> +
> + ret = dfh_get_u64_param_val(dfl_dev, DFHv1_PARAM_ID_REG_LAYOUT, ®_layout);
> + if (ret)
> + return dev_err_probe(dev, ret, "missing REG_LAYOUT param\n");
> +
> + uart->port.regshift = FIELD_GET(DFHv1_PARAM_REG_LAYOUT_SHIFT, reg_layout);
> + reg_width = FIELD_GET(DFHv1_PARAM_REG_LAYOUT_WIDTH, reg_layout);
> + switch (reg_width) {
> + case 4:
> + uart->port.iotype = UPIO_MEM32;
> + break;
> +
> + case 2:
> + uart->port.iotype = UPIO_MEM16;
> + break;
> +
> + default:
> + return dev_err_probe(dev, -EINVAL, "unsupported reg-width %u\n", reg_width);
> +
> + }
> +
> + return 0;
> +}
> +
> +static int dfl_uart_probe(struct dfl_device *dfl_dev)
> +{
> + struct device *dev = &dfl_dev->dev;
> + struct uart_8250_port uart = { };
> + struct dfl_uart *dfluart;
> + int ret;
> +
> + uart.port.flags = UPF_IOREMAP;
> + uart.port.mapbase = dfl_dev->mmio_res.start;
> + uart.port.mapsize = resource_size(&dfl_dev->mmio_res);
> +
> + ret = dfl_uart_get_params(dfl_dev, &uart);
> + if (ret < 0)
> + return dev_err_probe(dev, ret, "failed uart feature walk\n");
> +
> + if (dfl_dev->num_irqs == 1)
> + uart.port.irq = dfl_dev->irqs[0];
> +
> + dfluart = devm_kzalloc(dev, sizeof(*dfluart), GFP_KERNEL);
> + if (!dfluart)
> + return -ENOMEM;
> +
> + dfluart->line = serial8250_register_8250_port(&uart);
> + if (dfluart->line < 0)
> + return dev_err_probe(dev, dfluart->line, "unable to register 8250 port.\n");
> +
> + dev_set_drvdata(dev, dfluart);
> +
> + return 0;
> +}
> +
> +static void dfl_uart_remove(struct dfl_device *dfl_dev)
> +{
> + struct dfl_uart *dfluart = dev_get_drvdata(&dfl_dev->dev);
> +
> + serial8250_unregister_port(dfluart->line);
> +}
> +
> +#define FME_FEATURE_ID_UART 0x24
> +
> +static const struct dfl_device_id dfl_uart_ids[] = {
> + { FME_ID, FME_FEATURE_ID_UART },
> + { }
> +};
> +MODULE_DEVICE_TABLE(dfl, dfl_uart_ids);
> +
> +static struct dfl_driver dfl_uart_driver = {
> + .drv = {
> + .name = "dfl-uart",
> + },
> + .id_table = dfl_uart_ids,
> + .probe = dfl_uart_probe,
> + .remove = dfl_uart_remove,
> +};
> +module_dfl_driver(dfl_uart_driver);
> +
> +MODULE_DESCRIPTION("DFL Intel UART driver");
> +MODULE_AUTHOR("Intel Corporation");
> +MODULE_LICENSE("GPL");
> diff --git a/drivers/tty/serial/8250/Kconfig b/drivers/tty/serial/8250/Kconfig
> index b0f62345bc84..020ef532940d 100644
> --- a/drivers/tty/serial/8250/Kconfig
> +++ b/drivers/tty/serial/8250/Kconfig
> @@ -370,6 +370,18 @@ config SERIAL_8250_FSL
> erratum for Freescale 16550 UARTs in the 8250 driver. It also
> enables support for ACPI enumeration.
>
> +config SERIAL_8250_DFL
> + tristate "DFL bus driver for Altera 16550 UART"
> + depends on SERIAL_8250 && FPGA_DFL
> + help
> + This option enables support for a Device Feature List (DFL) bus
> + driver for the Altera 16550 UART. One or more Altera 16550 UARTs
> + can be instantiated in a FPGA and then be discovered during
> + enumeration of the DFL bus.
> +
> + To compile this driver as a module, chose M here: the
> + module will be called 8250_dfl.
> +
> config SERIAL_8250_DW
> tristate "Support for Synopsys DesignWare 8250 quirks"
> depends on SERIAL_8250
> diff --git a/drivers/tty/serial/8250/Makefile b/drivers/tty/serial/8250/Makefile
> index 1615bfdde2a0..4e1a32812683 100644
> --- a/drivers/tty/serial/8250/Makefile
> +++ b/drivers/tty/serial/8250/Makefile
> @@ -28,6 +28,7 @@ obj-$(CONFIG_SERIAL_8250_EXAR_ST16C554) += 8250_exar_st16c554.o
> obj-$(CONFIG_SERIAL_8250_HUB6) += 8250_hub6.o
> obj-$(CONFIG_SERIAL_8250_FSL) += 8250_fsl.o
> obj-$(CONFIG_SERIAL_8250_MEN_MCB) += 8250_men_mcb.o
> +obj-$(CONFIG_SERIAL_8250_DFL) += 8250_dfl.o
> obj-$(CONFIG_SERIAL_8250_DW) += 8250_dw.o
> obj-$(CONFIG_SERIAL_8250_EM) += 8250_em.o
> obj-$(CONFIG_SERIAL_8250_IOC3) += 8250_ioc3.o
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