[U-Boot] [PATCH v5 3/5] pinctrl: at91-pio4: Add pinctrl driver
Wenyou Yang
wenyou.yang at atmel.com
Mon Jun 20 04:02:09 CEST 2016
AT91 PIO4 controller is a combined gpio-controller, pin-mux and
pin-config module. The peripheral's pins are assigned through
per-pin based muxing logic.
The pin configuration is performed on specific registers which
are shared along with the gpio controller. So regard the pinctrl
device as a child of atmel_pio4 device.
Signed-off-by: Wenyou Yang <wenyou.yang at atmel.com>
Reviewed-by: Simon Glass <sjg at chromium.org>
---
Changes in v5:
- Fixed the return value, -ENODEV->-EINVAL.
- Remove check on dev_get_parent() return.
Changes in v4: None
Changes in v3:
- Rework due to the pinctrl device is regarded as atmel_pio4
device's child.
Changes in v2:
- remove meaningless comment.
- add else path for argument of pinconf.
- add inline attribute for atmel_pio4_bank_base().
- add handle if the pinmux entries is greater maximum value.
drivers/pinctrl/Kconfig | 7 ++
drivers/pinctrl/Makefile | 1 +
drivers/pinctrl/pinctrl-at91-pio4.c | 182 ++++++++++++++++++++++++++++++++++++
3 files changed, 190 insertions(+)
create mode 100644 drivers/pinctrl/pinctrl-at91-pio4.c
diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig
index 1785e3b..01ce740 100644
--- a/drivers/pinctrl/Kconfig
+++ b/drivers/pinctrl/Kconfig
@@ -123,6 +123,13 @@ config QCA953X_PINCTRL
both the GPIO definitions and pin control functions for each
available multiplex function.
+config PINCTRL_AT91PIO4
+ bool "AT91 PIO4 pinctrl driver"
+ depends on DM
+ help
+ This option is to enable the AT91 pinctrl driver for AT91 PIO4
+ controller which is available on SAMA5D2 SoC.
+
config ROCKCHIP_PINCTRL
bool "Rockchip pin control driver"
depends on DM
diff --git a/drivers/pinctrl/Makefile b/drivers/pinctrl/Makefile
index 7f94681..c92ab8c 100644
--- a/drivers/pinctrl/Makefile
+++ b/drivers/pinctrl/Makefile
@@ -5,6 +5,7 @@
obj-y += pinctrl-uclass.o
obj-$(CONFIG_$(SPL_)PINCTRL_GENERIC) += pinctrl-generic.o
+obj-$(CONFIG_PINCTRL_AT91PIO4) += pinctrl-at91-pio4.o
obj-y += nxp/
obj-$(CONFIG_ARCH_ATH79) += ath79/
obj-$(CONFIG_ARCH_ROCKCHIP) += rockchip/
diff --git a/drivers/pinctrl/pinctrl-at91-pio4.c b/drivers/pinctrl/pinctrl-at91-pio4.c
new file mode 100644
index 0000000..6d4aadc
--- /dev/null
+++ b/drivers/pinctrl/pinctrl-at91-pio4.c
@@ -0,0 +1,182 @@
+/*
+ * Atmel PIO4 pinctrl driver
+ *
+ * Copyright (C) 2016 Atmel Corporation
+ * Wenyou.Yang <wenyou.yang at atmel.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm/device.h>
+#include <dm/pinctrl.h>
+#include <linux/io.h>
+#include <linux/err.h>
+#include <mach/atmel_pio4.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/*
+ * Warning:
+ * In order to not introduce confusion between Atmel PIO groups and pinctrl
+ * framework groups, Atmel PIO groups will be called banks.
+ */
+
+struct atmel_pio4_platdata {
+ struct atmel_pio4_port *reg_base;
+};
+
+static const struct pinconf_param conf_params[] = {
+ { "bias-disable", PIN_CONFIG_BIAS_DISABLE, 0 },
+ { "bias-pull-up", PIN_CONFIG_BIAS_PULL_UP, 1 },
+ { "bias-pull-down", PIN_CONFIG_BIAS_PULL_DOWN, 1 },
+ { "drive-open-drain", PIN_CONFIG_DRIVE_OPEN_DRAIN, 0 },
+ { "input-schmitt-disable", PIN_CONFIG_INPUT_SCHMITT_ENABLE, 0 },
+ { "input-schmitt-enable", PIN_CONFIG_INPUT_SCHMITT_ENABLE, 1 },
+ { "input-debounce", PIN_CONFIG_INPUT_DEBOUNCE, 0 },
+};
+
+static u32 atmel_pinctrl_get_pinconf(const void *blob, int node)
+{
+ const struct pinconf_param *params;
+ u32 param, arg, conf = 0;
+ u32 i;
+
+ for (i = 0; i < ARRAY_SIZE(conf_params); i++) {
+ params = &conf_params[i];
+ if (!fdt_get_property(blob, node, params->property, NULL))
+ continue;
+
+ param = params->param;
+ arg = params->default_value;
+
+ switch (param) {
+ case PIN_CONFIG_BIAS_DISABLE:
+ conf &= (~ATMEL_PIO_PUEN_MASK);
+ conf &= (~ATMEL_PIO_PDEN_MASK);
+ break;
+ case PIN_CONFIG_BIAS_PULL_UP:
+ conf |= ATMEL_PIO_PUEN_MASK;
+ break;
+ case PIN_CONFIG_BIAS_PULL_DOWN:
+ conf |= ATMEL_PIO_PDEN_MASK;
+ break;
+ case PIN_CONFIG_DRIVE_OPEN_DRAIN:
+ if (arg == 0)
+ conf &= (~ATMEL_PIO_OPD_MASK);
+ else
+ conf |= ATMEL_PIO_OPD_MASK;
+ break;
+ case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
+ if (arg == 0)
+ conf |= ATMEL_PIO_SCHMITT_MASK;
+ else
+ conf &= (~ATMEL_PIO_SCHMITT_MASK);
+ break;
+ case PIN_CONFIG_INPUT_DEBOUNCE:
+ if (arg == 0) {
+ conf &= (~ATMEL_PIO_IFEN_MASK);
+ conf &= (~ATMEL_PIO_IFSCEN_MASK);
+ } else {
+ conf |= ATMEL_PIO_IFEN_MASK;
+ conf |= ATMEL_PIO_IFSCEN_MASK;
+ }
+ break;
+ default:
+ printf("%s: Unsupported configuration parameter: %u\n",
+ __func__, param);
+ break;
+ }
+ }
+
+ return conf;
+}
+
+static inline struct atmel_pio4_port *atmel_pio4_bank_base(struct udevice *dev,
+ u32 bank)
+{
+ struct atmel_pio4_platdata *plat = dev_get_platdata(dev);
+ struct atmel_pio4_port *bank_base =
+ (struct atmel_pio4_port *)((u32)plat->reg_base +
+ ATMEL_PIO_BANK_OFFSET * bank);
+
+ return bank_base;
+}
+
+#define MAX_PINMUX_ENTRIES 40
+
+static int atmel_pinctrl_set_state(struct udevice *dev, struct udevice *config)
+{
+ struct atmel_pio4_port *bank_base;
+ const void *blob = gd->fdt_blob;
+ int node = config->of_offset;
+ u32 offset, func, bank, line;
+ u32 cells[MAX_PINMUX_ENTRIES];
+ u32 i, conf;
+ int count;
+
+ conf = atmel_pinctrl_get_pinconf(blob, node);
+
+ count = fdtdec_get_int_array_count(blob, node, "pinmux",
+ cells, ARRAY_SIZE(cells));
+ if (count < 0) {
+ printf("%s: bad pinmux array %d\n", __func__, count);
+ return -EINVAL;
+ }
+
+ if (count > MAX_PINMUX_ENTRIES) {
+ printf("%s: unsupported pinmux array count %d\n",
+ __func__, count);
+ return -EINVAL;
+ }
+
+ for (i = 0 ; i < count; i++) {
+ offset = ATMEL_GET_PIN_NO(cells[i]);
+ func = ATMEL_GET_PIN_FUNC(cells[i]);
+
+ bank = ATMEL_PIO_BANK(offset);
+ line = ATMEL_PIO_LINE(offset);
+
+ bank_base = atmel_pio4_bank_base(dev, bank);
+
+ writel(BIT(line), &bank_base->mskr);
+ conf &= (~ATMEL_PIO_CFGR_FUNC_MASK);
+ conf |= (func & ATMEL_PIO_CFGR_FUNC_MASK);
+ writel(conf, &bank_base->cfgr);
+ }
+
+ return 0;
+}
+
+const struct pinctrl_ops atmel_pinctrl_ops = {
+ .set_state = atmel_pinctrl_set_state,
+};
+
+static int atmel_pinctrl_probe(struct udevice *dev)
+{
+ struct atmel_pio4_platdata *plat = dev_get_platdata(dev);
+ fdt_addr_t addr_base;
+
+ dev = dev_get_parent(dev);
+ addr_base = dev_get_addr(dev);
+ if (addr_base == FDT_ADDR_T_NONE)
+ return -EINVAL;
+
+ plat->reg_base = (struct atmel_pio4_port *)addr_base;
+
+ return 0;
+}
+
+static const struct udevice_id atmel_pinctrl_match[] = {
+ { .compatible = "atmel,sama5d2-pinctrl" },
+ {}
+};
+
+U_BOOT_DRIVER(atmel_pinctrl) = {
+ .name = "pinctrl_atmel_pio4",
+ .id = UCLASS_PINCTRL,
+ .of_match = atmel_pinctrl_match,
+ .probe = atmel_pinctrl_probe,
+ .platdata_auto_alloc_size = sizeof(struct atmel_pio4_platdata),
+ .ops = &atmel_pinctrl_ops,
+};
--
2.7.4
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