[PATCH v2 09/17] board: cssi: Add support for SPI bus on MCR3000 board

Christophe Leroy
2024-04-15T06:09:30Z

MCR3000 board has some components tied to the SPI bus, like the Texas
Instruments LM74 temperature sensor.

Add support for SPI bus. The SPI chipselects are a bit special in the
way that they are driven by 3 bits in a register of the board's CPLD
where the value writen in those bits exclusively activates one of the
7 possible chipselects and value 0 sets all chipselets to inactive.

So add a special GPIO driver that simulates GPIOs for those chipselect.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
---
arch/powerpc/dts/mcr3000.dts | 31 +++++++++
board/cssi/mcr3000/Makefile | 1 +
board/cssi/mcr3000/mcr3000.c | 5 ++
board/cssi/mcr3000/mcr3000_gpio.c | 109 ++++++++++++++++++++++++++++++
configs/MCR3000_defconfig | 5 ++
5 files changed, 151 insertions(+)
create mode 100644 board/cssi/mcr3000/mcr3000_gpio.c

diff --git a/arch/powerpc/dts/mcr3000.dts b/arch/powerpc/dts/mcr3000.dts
index c4d7737bc6..edcd8358d0 100644
--- a/arch/powerpc/dts/mcr3000.dts
+++ b/arch/powerpc/dts/mcr3000.dts
@@ -26,6 +26,37 @@
timeout-sec = <2>;
hw_margin_ms = <1000>;
};
+
+ spi: spi@aa0 {
+ status = "okay";
+ #address-cells = <1>;
+ #size-cells = <0>;
+ cell-index = <0>;
+ compatible = "fsl,mpc8xx-spi";
+ };
+ };
+
+ localbus@ff000100 {
+ compatible = "s3k,mcr3000-localbus", "fsl,pq1-localbus", "simple-bus";
+ #address-cells = <2>;
+ #size-cells = <1>;
+ reg = <0xff000100 0x40>; // ORx and BRx register
+
+ ranges = <0 0 0x04000000 0x04000000 // BOOT
+ 1 0 0x00000000 0x04000000 // SDRAM
+ 2 0 0x08000000 0x04000000 // RAMDP
+ 3 0 0x0C000000 0x04000000 // NAND
+ 4 0 0x10000000 0x04000000 // Periphs
+ 5 0 0x14000000 0x04000000 // FPGA
+ 6 0 0x18000000 0x04000000 // mezzanine
+ 7 0 0x1c000000 0x04000000>; // DSP
+
+ csspi: gpio-controller@2 {
+ #gpio-cells = <2>;
+ compatible = "s3k,mcr3000-cpld-csspi";
+ reg = <4 0x802 2>;
+ gpio-controller;
+ };
};

SERIAL: smc@0 {
diff --git a/board/cssi/mcr3000/Makefile b/board/cssi/mcr3000/Makefile
index 7803016af3..846fd680e9 100644
--- a/board/cssi/mcr3000/Makefile
+++ b/board/cssi/mcr3000/Makefile
@@ -6,3 +6,4 @@

obj-y += mcr3000.o
obj-$(CONFIG_CMD_NAND) += nand.o
+obj-$(CONFIG_MPC8XX_SPI) += mcr3000_gpio.o
diff --git a/board/cssi/mcr3000/mcr3000.c b/board/cssi/mcr3000/mcr3000.c
index 8857c9e42c..537d7fa124 100644
--- a/board/cssi/mcr3000/mcr3000.c
+++ b/board/cssi/mcr3000/mcr3000.c
@@ -116,6 +116,11 @@ int misc_init_r(void)
clrbits_be16(&iop->iop_pcpar, 0x4);
clrbits_be16(&iop->iop_pcdir, 0x4);

+ /* Activate SPI */
+ clrsetbits_be32(&immr->im_cpm.cp_pbpar, 0x1, 0xe);
+ setbits_be32(&immr->im_cpm.cp_pbdir, 0xf);
+ clrbits_be32(&immr->im_cpm.cp_pbdat, 0x1);
+
/* if BTN_ACQ_AL is pressed then bootdelay is changed to 60 second */
if ((in_be16(&iop->iop_pcdat) & 0x0004) == 0)
env_set("bootdelay", "60");
diff --git a/board/cssi/mcr3000/mcr3000_gpio.c b/board/cssi/mcr3000/mcr3000_gpio.c
new file mode 100644
index 0000000000..2bba14e6e5
--- /dev/null
+++ b/board/cssi/mcr3000/mcr3000_gpio.c
@@ -0,0 +1,109 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2024 CS GROUP France
+ * Christophe Leroy <christophe.leroy@csgroup.eu>
+ */
+
+#include <asm/io.h>
+#include <dm.h>
+#include <mapmem.h>
+#include <asm/gpio.h>
+#include <malloc.h>
+
+#include "../common/common.h"
+
+struct mcr3000_spi_gpio_plat {
+ ulong addr;
+};
+
+struct mcr3000_spi_gpio_data {
+ void __iomem *base;
+};
+
+static int mcr3000_spi_gpio_set_value(struct udevice *dev, uint gpio, int value)
+{
+ struct mcr3000_spi_gpio_data *data = dev_get_priv(dev);
+
+ if (value)
+ clrsetbits_be16(data->base, 7 << 5, (gpio & 7) << 5);
+ else
+ clrbits_be16(data->base, 7 << 5);
+
+ return 0;
+}
+
+static int mcr3000_spi_gpio_get_value(struct udevice *dev, uint gpio)
+{
+ struct mcr3000_spi_gpio_data *data = dev_get_priv(dev);
+
+ return gpio == ((in_be16(data->base) >> 5) & 7);
+}
+
+static int mcr3000_spi_gpio_direction_input(struct udevice *dev, uint gpio)
+{
+ return 0;
+}
+
+static int mcr3000_spi_gpio_get_function(struct udevice *dev, uint gpio)
+{
+ return GPIOF_OUTPUT;
+}
+
+static int mcr3000_spi_gpio_ofdata_to_platdata(struct udevice *dev)
+{
+ struct mcr3000_spi_gpio_plat *plat = dev_get_plat(dev);
+ fdt_addr_t addr;
+ u32 reg[2];
+
+ dev_read_u32_array(dev, "reg", reg, 2);
+ addr = dev_translate_address(dev, reg);
+
+ plat->addr = addr;
+
+ return 0;
+}
+
+static int mcr3000_spi_gpio_probe(struct udevice *dev)
+{
+ struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
+ struct mcr3000_spi_gpio_data *data = dev_get_priv(dev);
+ struct mcr3000_spi_gpio_plat *plat = dev_get_plat(dev);
+ char name[32], *str;
+
+ data->base = map_sysmem(plat->addr, 2);
+
+ snprintf(name, sizeof(name), "CHIPSELECT@%lx_", plat->addr);
+ str = strdup(name);
+
+ if (!str)
+ return -ENOMEM;
+
+ uc_priv->bank_name = str;
+ uc_priv->gpio_count = 16;
+
+ return 0;
+}
+
+static const struct dm_gpio_ops gpio_mcr3000_spi_ops = {
+ .get_value = mcr3000_spi_gpio_get_value,
+ .set_value = mcr3000_spi_gpio_set_value,
+ .direction_input = mcr3000_spi_gpio_direction_input,
+ .direction_output = mcr3000_spi_gpio_set_value,
+ .get_function = mcr3000_spi_gpio_get_function,
+};
+
+static const struct udevice_id mcr3000_spi_gpio_ids[] = {
+ { .compatible = "s3k,mcr3000-cpld-csspi"},
+ { /* sentinel */ }
+};
+
+U_BOOT_DRIVER(mcr3000_spi_gpio) = {
+ .name = "mcr3000_spi_chipselect",
+ .id = UCLASS_GPIO,
+ .ops = &gpio_mcr3000_spi_ops,
+ .of_to_plat = mcr3000_spi_gpio_ofdata_to_platdata,
+ .plat_auto = sizeof(struct mcr3000_spi_gpio_plat),
+ .of_match = mcr3000_spi_gpio_ids,
+ .probe = mcr3000_spi_gpio_probe,
+ .priv_auto = sizeof(struct mcr3000_spi_gpio_data),
+};
diff --git a/configs/MCR3000_defconfig b/configs/MCR3000_defconfig
index 8a88fb445c..ce34c2aa88 100644
--- a/configs/MCR3000_defconfig
+++ b/configs/MCR3000_defconfig
@@ -2,6 +2,7 @@ CONFIG_PPC=y
CONFIG_TEXT_BASE=0x4000000
CONFIG_ENV_SIZE=0x2000
CONFIG_ENV_SECT_SIZE=0x2000
+CONFIG_DM_GPIO=y
CONFIG_DEFAULT_DEVICE_TREE="mcr3000"
CONFIG_SYS_MONITOR_LEN=327680
CONFIG_SYS_CLK_FREQ=132000000
@@ -91,6 +92,7 @@ CONFIG_SYS_OR6_PRELIM=0xFFFF0908
CONFIG_SYS_BR7_PRELIM_BOOL=y
CONFIG_SYS_BR7_PRELIM=0x1C000001
CONFIG_SYS_OR7_PRELIM=0xFFFF810A
+CONFIG_MPC8XX_GPIO=y
# CONFIG_MMC is not set
CONFIG_MTD=y
CONFIG_DM_MTD=y
@@ -102,6 +104,9 @@ CONFIG_SYS_MAX_FLASH_SECT=35
CONFIG_MTD_RAW_NAND=y
CONFIG_MPC8XX_FEC=y
CONFIG_DM_SERIAL=y
+CONFIG_SPI=y
+CONFIG_DM_SPI=y
+CONFIG_MPC8XX_SPI=y
CONFIG_WDT=y
CONFIG_WDT_MPC8xxx_BME=y
CONFIG_LZMA=y
--
2.43.0