powerpc, qe: add DTS support for parallel I/O ports

add DM support for parallel I/O ports on QUICC Engine Block

Signed-off-by: Heiko Schocher <hs@denx.de>
Patch-cc: Mario Six <mario.six@gdsys.cc>
Patch-cc: Qiang Zhao <qiang.zhao@nxp.com>
Patch-cc: Holger Brunck <holger.brunck@hitachi-powergrids.com>

Series-changes: 2
- remove RFC
- fixed Codingstyle errors, therefore new patch
  powerpc, mpc83xx: fix codingstyle issues for qe_io.c
- moved DM part to drivers/pinctrl

Commit-notes:
Open questions / discussion:

- I let the old none DM based implementation in code
  so boards should work with old implementation.

  This should be removed if all boards are converted to
  DM/DTS.

- Unfortunately linux DTS does not use "pinctrl-"
  properties, instead "pio-handle" properties.

  Even worser old U-Boot code initializes all pins
  defined in "const qe_iop_conf_t qe_iop_conf_tab[]"
  table in board code. As linux does the same I decided
  to also scan through all subnodes containing "pio-map"
  property and initialize them too.

  The proper solution would be to check for "pio-handle"
  when a device is probed.

END

1 files changed, 255 insertions, 0 deletions

diff --git a/drivers/pinctrl/pinctrl-qe-io.c b/drivers/pinctrl/pinctrl-qe-io.c
new file mode 100644
index 0000000..85521ea
--- /dev/null
+++ b/drivers/pinctrl/pinctrl-qe-io.c
@@ -0,0 +1,255 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2006 Freescale Semiconductor, Inc.
+ *
+ * Dave Liu <daveliu@freescale.com>
+ * based on source code of Shlomi Gridish
+ */
+
+#include <common.h>
+#include <linux/errno.h>
+#include <asm/io.h>
+#include <asm/immap_83xx.h>
+
+#if defined(CONFIG_PINCTRL)
+#include <dm.h>
+#include <dm/device_compat.h>
+#include <dm/pinctrl.h>
+#include <linux/ioport.h>
+
+/**
+ * struct qe_io_platdata
+ *
+ * @base:		Base register address
+ * @num_par_io_ports	number of io ports
+ */
+struct qe_io_platdata {
+	qepio83xx_t *base;
+	u32 num_io_ports;
+};
+#endif
+
+#define	NUM_OF_PINS	32
+
+/** qe_cfg_iopin configure one io pin setting
+ *
+ * @par_io:	pointer to parallel I/O base
+ * @port:	io pin port
+ * @pin:	io pin number which get configured
+ * @dir:	direction of io pin 2 bits valid
+ *		00 = pin disabled
+ *		01 = output
+ *		10 = input
+ *		11 = pin is I/O
+ * @open_drain:	is pin open drain
+ * @assign:	pin assignment registers select the function of the pin
+ */
+static void qe_cfg_iopin(qepio83xx_t *par_io, u8 port, u8 pin, int dir,
+			 int open_drain, int assign)
+{
+	u32	dbit_mask;
+	u32	dbit_dir;
+	u32	dbit_asgn;
+	u32	bit_mask;
+	u32	tmp_val;
+	int	offset;
+
+	offset = (NUM_OF_PINS - (pin % (NUM_OF_PINS / 2) + 1) * 2);
+
+	/* Calculate pin location and 2bit mask and dir */
+	dbit_mask = (u32)(0x3 << offset);
+	dbit_dir = (u32)(dir << offset);
+
+	/* Setup the direction */
+	tmp_val = (pin > (NUM_OF_PINS / 2) - 1) ?
+		in_be32(&par_io->ioport[port].dir2) :
+		in_be32(&par_io->ioport[port].dir1);
+
+	if (pin > (NUM_OF_PINS / 2) - 1) {
+		out_be32(&par_io->ioport[port].dir2, ~dbit_mask & tmp_val);
+		out_be32(&par_io->ioport[port].dir2, dbit_dir | tmp_val);
+	} else {
+		out_be32(&par_io->ioport[port].dir1, ~dbit_mask & tmp_val);
+		out_be32(&par_io->ioport[port].dir1, dbit_dir | tmp_val);
+	}
+
+	/* Calculate pin location for 1bit mask */
+	bit_mask = (u32)(1 << (NUM_OF_PINS - (pin + 1)));
+
+	/* Setup the open drain */
+	tmp_val = in_be32(&par_io->ioport[port].podr);
+	if (open_drain)
+		out_be32(&par_io->ioport[port].podr, bit_mask | tmp_val);
+	else
+		out_be32(&par_io->ioport[port].podr, ~bit_mask & tmp_val);
+
+	/* Setup the assignment */
+	tmp_val = (pin > (NUM_OF_PINS / 2) - 1) ?
+		in_be32(&par_io->ioport[port].ppar2) :
+		in_be32(&par_io->ioport[port].ppar1);
+	dbit_asgn = (u32)(assign << offset);
+
+	/* Clear and set 2 bits mask */
+	if (pin > (NUM_OF_PINS / 2) - 1) {
+		out_be32(&par_io->ioport[port].ppar2, ~dbit_mask & tmp_val);
+		out_be32(&par_io->ioport[port].ppar2, dbit_asgn | tmp_val);
+	} else {
+		out_be32(&par_io->ioport[port].ppar1, ~dbit_mask & tmp_val);
+		out_be32(&par_io->ioport[port].ppar1, dbit_asgn | tmp_val);
+	}
+}
+
+#if !defined(CONFIG_PINCTRL)
+/** qe_config_iopin configure one io pin setting
+ *
+ * @port:	io pin port
+ * @pin:	io pin number which get configured
+ * @dir:	direction of io pin 2 bits valid
+ *		00 = pin disabled
+ *		01 = output
+ *		10 = input
+ *		11 = pin is I/O
+ * @open_drain:	is pin open drain
+ * @assign:	pin assignment registers select the function of the pin
+ */
+void qe_config_iopin(u8 port, u8 pin, int dir, int open_drain, int assign)
+{
+	immap_t        *im = (immap_t *)CONFIG_SYS_IMMR;
+	qepio83xx_t    *par_io = (qepio83xx_t *)&im->qepio;
+
+	qe_cfg_iopin(par_io, port, pin, dir, open_drain, assign);
+}
+#else
+static int qe_io_ofdata_to_platdata(struct udevice *dev)
+{
+	struct qe_io_platdata *plat = dev->platdata;
+	fdt_addr_t addr;
+
+	addr = dev_read_addr(dev);
+	if (addr == FDT_ADDR_T_NONE)
+		return -EINVAL;
+
+	plat->base = (qepio83xx_t *)addr;
+	if (dev_read_u32(dev, "num-ports", &plat->num_io_ports))
+		return -EINVAL;
+
+	return 0;
+}
+
+/**
+ * par_io_of_config_node	config
+ * @dev:	pointer to pinctrl device
+ * @pio:	ofnode of pinconfig property
+ */
+static int par_io_of_config_node(struct udevice *dev, ofnode pio)
+{
+	struct qe_io_platdata *plat = dev->platdata;
+	qepio83xx_t *par_io = plat->base;
+	const unsigned int *pio_map;
+	int pio_map_len;
+
+	pio_map = ofnode_get_property(pio, "pio-map", &pio_map_len);
+	if (!pio_map)
+		return -ENOENT;
+
+	pio_map_len /= sizeof(unsigned int);
+	if ((pio_map_len % 6) != 0) {
+		dev_err(dev, "%s: pio-map format wrong!\n", __func__);
+		return -EINVAL;
+	}
+
+	while (pio_map_len > 0) {
+		/*
+		 * column pio_map[5] from linux (has_irq) not
+		 * supported in u-boot yet.
+		 */
+		qe_cfg_iopin(par_io, (u8)pio_map[0], (u8)pio_map[1],
+			     (int)pio_map[2], (int)pio_map[3],
+			     (int)pio_map[4]);
+		pio_map += 6;
+		pio_map_len -= 6;
+	}
+	return 0;
+}
+
+int par_io_of_config(struct udevice *dev)
+{
+	u32 phandle;
+	ofnode pio;
+	int err;
+
+	err = ofnode_read_u32(dev_ofnode(dev), "pio-handle", &phandle);
+	if (err) {
+		dev_err(dev, "%s: pio-handle not available\n", __func__);
+		return err;
+	}
+
+	pio = ofnode_get_by_phandle(phandle);
+	if (!ofnode_valid(pio)) {
+		dev_err(dev, "%s: unable to find node\n", __func__);
+		return -EINVAL;
+	}
+
+	/* To Do: find pinctrl device and pass it */
+	return par_io_of_config_node(NULL, pio);
+}
+
+/*
+ * This is not nice!
+ * pinsettings should work with "pinctrl-" properties.
+ * Unfortunately on mpc83xx powerpc linux device trees
+ * devices handle this with "pio-handle" properties ...
+ *
+ * Even worser, old board code inits all par_io
+ * pins in one step, if U-Boot uses the device
+ * or not. So init all par_io definitions here too
+ * as linux does this also.
+ */
+static void config_qe_ioports(struct udevice *dev)
+{
+	ofnode ofn;
+
+	for (ofn = dev_read_first_subnode(dev); ofnode_valid(ofn);
+	     ofn = dev_read_next_subnode(ofn)) {
+		/*
+		 * ignore errors here, as may the subnode
+		 * has no pio-handle
+		 */
+		par_io_of_config_node(dev, ofn);
+	}
+}
+
+static int par_io_pinctrl_probe(struct udevice *dev)
+{
+	config_qe_ioports(dev);
+
+	return 0;
+}
+
+static int par_io_pinctrl_set_state(struct udevice *dev, struct udevice *config)
+{
+	return 0;
+}
+
+const struct pinctrl_ops par_io_pinctrl_ops = {
+	.set_state = par_io_pinctrl_set_state,
+};
+
+static const struct udevice_id par_io_pinctrl_match[] = {
+	{ .compatible = "fsl,mpc8360-par_io"},
+	{ /* sentinel */ }
+};
+
+U_BOOT_DRIVER(par_io_pinctrl) = {
+	.name = "par-io-pinctrl",
+	.id = UCLASS_PINCTRL,
+	.of_match = of_match_ptr(par_io_pinctrl_match),
+	.probe = par_io_pinctrl_probe,
+	.ofdata_to_platdata = qe_io_ofdata_to_platdata,
+	.platdata_auto_alloc_size = sizeof(struct qe_io_platdata),
+	.ops = &par_io_pinctrl_ops,
+#if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)
+	.flags	= DM_FLAG_PRE_RELOC,
+#endif
+};
+#endif