--- /dev/null
+/*
+ * Pinctrl driver for STMicroelectronics STi SoCs
+ *
+ * Copyright (c) 2017
+ * Patrice Chotard <patrice.chotard@st.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0
+ */
+
+#include <common.h>
+#include <bitfield.h>
+#include <dm.h>
+#include <errno.h>
+#include <regmap.h>
+#include <syscon.h>
+#include <asm/io.h>
+#include <dm/pinctrl.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#define MAX_STI_PINCONF_ENTRIES 7
+/* Output enable */
+#define OE (1 << 27)
+/* Pull Up */
+#define PU (1 << 26)
+/* Open Drain */
+#define OD (1 << 25)
+
+/* User-frendly defines for Pin Direction */
+ /* oe = 0, pu = 0, od = 0 */
+#define IN (0)
+ /* oe = 0, pu = 1, od = 0 */
+#define IN_PU (PU)
+ /* oe = 1, pu = 0, od = 0 */
+#define OUT (OE)
+ /* oe = 1, pu = 1, od = 0 */
+#define OUT_PU (OE | PU)
+ /* oe = 1, pu = 0, od = 1 */
+#define BIDIR (OE | OD)
+ /* oe = 1, pu = 1, od = 1 */
+#define BIDIR_PU (OE | PU | OD)
+
+struct sti_pinctrl_platdata {
+ struct regmap *regmap;
+};
+
+struct sti_pin_desc {
+ unsigned char bank;
+ unsigned char pin;
+ unsigned char alt;
+ int dir;
+};
+
+/*
+ * PIO alternative Function selector
+ */
+void sti_alternate_select(struct udevice *dev, struct sti_pin_desc *pin_desc)
+{
+ struct sti_pinctrl_platdata *plat = dev_get_platdata(dev);
+ unsigned long sysconf, *sysconfreg;
+ int alt = pin_desc->alt;
+ int bank = pin_desc->bank;
+ int pin = pin_desc->pin;
+
+ sysconfreg = (unsigned long *)plat->regmap->base;
+
+ switch (bank) {
+ case 0 ... 5: /* in "SBC Bank" */
+ sysconfreg += bank;
+ break;
+ case 10 ... 20: /* in "FRONT Bank" */
+ sysconfreg += bank - 10;
+ break;
+ case 30 ... 35: /* in "REAR Bank" */
+ sysconfreg += bank - 30;
+ break;
+ case 40 ... 42: /* in "FLASH Bank" */
+ sysconfreg += bank - 40;
+ break;
+ default:
+ BUG();
+ return;
+ }
+
+ sysconf = readl(sysconfreg);
+ sysconf = bitfield_replace(sysconf, pin * 4, 3, alt);
+ writel(sysconf, sysconfreg);
+}
+
+/* pin configuration */
+void sti_pin_configure(struct udevice *dev, struct sti_pin_desc *pin_desc)
+{
+ struct sti_pinctrl_platdata *plat = dev_get_platdata(dev);
+ int bit;
+ int oe = 0, pu = 0, od = 0;
+ unsigned long *sysconfreg;
+ int bank = pin_desc->bank;
+
+ sysconfreg = (unsigned long *)plat->regmap->base + 40;
+
+ /*
+ * NOTE: The PIO configuration for the PIO pins in the
+ * "FLASH Bank" are different from all the other banks!
+ * Specifically, the output-enable pin control register
+ * (SYS_CFG_3040) and the pull-up pin control register
+ * (SYS_CFG_3050), are both classed as being "reserved".
+ * Hence, we do not write to these registers to configure
+ * the OE and PU features for PIOs in this bank. However,
+ * the open-drain pin control register (SYS_CFG_3060)
+ * follows the style of the other banks, and so we can
+ * treat that register normally.
+ *
+ * Being pedantic, we should configure the PU and PD features
+ * in the "FLASH Bank" explicitly instead using the four
+ * SYS_CFG registers: 3080, 3081, 3085, and 3086. However, this
+ * would necessitate passing in the alternate function number
+ * to this function, and adding some horrible complexity here.
+ * Alternatively, we could just perform 4 32-bit "pokes" to
+ * these four SYS_CFG registers early in the initialization.
+ * In practice, these four SYS_CFG registers are correct
+ * after a reset, and U-Boot does not need to change them, so
+ * we (cheat and) rely on these registers being correct.
+ * WARNING: Please be aware of this (pragmatic) behaviour!
+ */
+ int flashss = 0; /* bool: PIO in the Flash Sub-System ? */
+
+ switch (pin_desc->dir) {
+ case IN:
+ oe = 0; pu = 0; od = 0;
+ break;
+ case IN_PU:
+ oe = 0; pu = 1; od = 0;
+ break;
+ case OUT:
+ oe = 1; pu = 0; od = 0;
+ break;
+ case BIDIR:
+ oe = 1; pu = 0; od = 1;
+ break;
+ case BIDIR_PU:
+ oe = 1; pu = 1; od = 1;
+ break;
+
+ default:
+ error("%s invalid direction value: 0x%x\n",
+ __func__, pin_desc->dir);
+ BUG();
+ break;
+ }
+
+ switch (bank) {
+ case 0 ... 5: /* in "SBC Bank" */
+ sysconfreg += bank / 4;
+ break;
+ case 10 ... 20: /* in "FRONT Bank" */
+ bank -= 10;
+ sysconfreg += bank / 4;
+ break;
+ case 30 ... 35: /* in "REAR Bank" */
+ bank -= 30;
+ sysconfreg += bank / 4;
+ break;
+ case 40 ... 42: /* in "FLASH Bank" */
+ bank -= 40;
+ sysconfreg += bank / 4;
+ flashss = 1; /* pin is in the Flash Sub-System */
+ break;
+ default:
+ BUG();
+ return;
+ }
+
+ bit = ((bank * 8) + pin_desc->pin) % 32;
+
+ /*
+ * set the "Output Enable" pin control
+ * but, do nothing if in the flashSS
+ */
+ if (!flashss) {
+ if (oe)
+ generic_set_bit(bit, sysconfreg);
+ else
+ generic_clear_bit(bit, sysconfreg);
+ }
+
+ sysconfreg += 10; /* skip to next set of syscfg registers */
+
+ /*
+ * set the "Pull Up" pin control
+ * but, do nothing if in the FlashSS
+ */
+
+ if (!flashss) {
+ if (pu)
+ generic_set_bit(bit, sysconfreg);
+ else
+ generic_clear_bit(bit, sysconfreg);
+ }
+
+ sysconfreg += 10; /* skip to next set of syscfg registers */
+
+ /* set the "Open Drain Enable" pin control */
+ if (od)
+ generic_set_bit(bit, sysconfreg);
+ else
+ generic_clear_bit(bit, sysconfreg);
+}
+
+
+static int sti_pinctrl_set_state(struct udevice *dev, struct udevice *config)
+{
+ struct fdtdec_phandle_args args;
+ const void *blob = gd->fdt_blob;
+ const char *prop_name;
+ int node = dev_of_offset(config);
+ int property_offset, prop_len;
+ int pinconf_node, ret, count;
+ const char *bank_name;
+ u32 cells[MAX_STI_PINCONF_ENTRIES];
+
+ struct sti_pin_desc pin_desc;
+
+ /* go to next node "st,pins" which contains the pins configuration */
+ pinconf_node = fdt_subnode_offset(blob, node, "st,pins");
+
+ /*
+ * parse each pins configuration which looks like :
+ * pin_name = <bank_phandle pin_nb alt dir rt_type rt_delay rt_clk>
+ */
+
+ fdt_for_each_property_offset(property_offset, blob, pinconf_node) {
+ fdt_getprop_by_offset(blob, property_offset, &prop_name,
+ &prop_len);
+
+ /* extract the bank of the pin description */
+ ret = fdtdec_parse_phandle_with_args(blob, pinconf_node,
+ prop_name, "#gpio-cells",
+ 0, 0, &args);
+ if (ret < 0) {
+ error("Can't get the gpio bank phandle: %d\n", ret);
+ return ret;
+ }
+
+ bank_name = fdt_getprop(blob, args.node, "st,bank-name",
+ &count);
+ if (count < 0) {
+ error("Can't find bank-name property %d\n", count);
+ return -EINVAL;
+ }
+
+ pin_desc.bank = trailing_strtoln(bank_name, NULL);
+
+ count = fdtdec_get_int_array_count(blob, pinconf_node,
+ prop_name, cells,
+ ARRAY_SIZE(cells));
+ if (count < 0) {
+ error("Bad pin configuration array %d\n", count);
+ return -EINVAL;
+ }
+
+ if (count > MAX_STI_PINCONF_ENTRIES) {
+ error("Unsupported pinconf array count %d\n", count);
+ return -EINVAL;
+ }
+
+ pin_desc.pin = cells[1];
+ pin_desc.alt = cells[2];
+ pin_desc.dir = cells[3];
+
+ sti_alternate_select(dev, &pin_desc);
+ sti_pin_configure(dev, &pin_desc);
+ };
+
+ return 0;
+}
+
+static int sti_pinctrl_probe(struct udevice *dev)
+{
+ struct sti_pinctrl_platdata *plat = dev_get_platdata(dev);
+ struct udevice *syscon;
+ int err;
+
+ /* get corresponding syscon phandle */
+ err = uclass_get_device_by_phandle(UCLASS_SYSCON, dev,
+ "st,syscfg", &syscon);
+ if (err) {
+ error("unable to find syscon device\n");
+ return err;
+ }
+
+ plat->regmap = syscon_get_regmap(syscon);
+ if (!plat->regmap) {
+ error("unable to find regmap\n");
+ return -ENODEV;
+ }
+
+ return 0;
+}
+
+static const struct udevice_id sti_pinctrl_ids[] = {
+ { .compatible = "st,stih407-sbc-pinctrl" },
+ { .compatible = "st,stih407-front-pinctrl" },
+ { .compatible = "st,stih407-rear-pinctrl" },
+ { .compatible = "st,stih407-flash-pinctrl" },
+ { }
+};
+
+const struct pinctrl_ops sti_pinctrl_ops = {
+ .set_state = sti_pinctrl_set_state,
+};
+
+U_BOOT_DRIVER(pinctrl_sti) = {
+ .name = "pinctrl_sti",
+ .id = UCLASS_PINCTRL,
+ .of_match = sti_pinctrl_ids,
+ .ops = &sti_pinctrl_ops,
+ .probe = sti_pinctrl_probe,
+ .platdata_auto_alloc_size = sizeof(struct sti_pinctrl_platdata),
+ .ops = &sti_pinctrl_ops,
+};
projects / u-boot.git / commitdiff
