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u-boot/drivers/pinctrl/pinctrl_pic32.c
Tom Rini 83d290c56f SPDX: Convert all of our single license tags to Linux Kernel style 
When U-Boot started using SPDX tags we were among the early adopters and
there weren't a lot of other examples to borrow from.  So we picked the
area of the file that usually had a full license text and replaced it
with an appropriate SPDX-License-Identifier: entry.  Since then, the
Linux Kernel has adopted SPDX tags and they place it as the very first
line in a file (except where shebangs are used, then it's second line)
and with slightly different comment styles than us.

In part due to community overlap, in part due to better tag visibility
and in part for other minor reasons, switch over to that style.

This commit changes all instances where we have a single declared
license in the tag as both the before and after are identical in tag
contents.  There's also a few places where I found we did not have a tag
and have introduced one.

Signed-off-by: Tom Rini <trini@konsulko.com>
2018-05-07 09:34:12 -04:00

355 lines
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// SPDX-License-Identifier: GPL-2.0+
/*
* Pinctrl driver for Microchip PIC32 SoCs
* Copyright (c) 2015 Microchip Technology Inc.
* Written by Purna Chandra Mandal <purna.mandal@microchip.com>
*/
#include <common.h>
#include <dm.h>
#include <errno.h>
#include <asm/io.h>
#include <dm/pinctrl.h>
#include <mach/pic32.h>
DECLARE_GLOBAL_DATA_PTR;
/* PIC32 has 10 peripheral ports with 16 pins each.
* Ports are marked PORTA-PORTK or PORT0-PORT9.
*/
enum {
PIC32_PORT_A = 0,
PIC32_PORT_B = 1,
PIC32_PORT_C = 2,
PIC32_PORT_D = 3,
PIC32_PORT_E = 4,
PIC32_PORT_F = 5,
PIC32_PORT_G = 6,
PIC32_PORT_H = 7,
PIC32_PORT_J = 8, /* no PORT_I */
PIC32_PORT_K = 9,
PIC32_PINS_PER_PORT = 16,
};
#define PIN_CONFIG_PIC32_DIGITAL (PIN_CONFIG_END + 1)
#define PIN_CONFIG_PIC32_ANALOG (PIN_CONFIG_END + 2)
/* pin configuration descriptor */
struct pic32_pin_config {
u16 port; /* port number */
u16 pin; /* pin number in the port */
u32 config; /* one of PIN_CONFIG_* */
};
#define PIN_CONFIG(_prt, _pin, _cfg) \
{.port = (_prt), .pin = (_pin), .config = (_cfg), }
/* In PIC32 muxing is performed at pin-level through two
* different set of registers - one set for input functions,
* and other for output functions.
* Pin configuration is handled through port register.
*/
/* Port control registers */
struct pic32_reg_port {
struct pic32_reg_atomic ansel;
struct pic32_reg_atomic tris;
struct pic32_reg_atomic port;
struct pic32_reg_atomic lat;
struct pic32_reg_atomic odc;
struct pic32_reg_atomic cnpu;
struct pic32_reg_atomic cnpd;
struct pic32_reg_atomic cncon;
struct pic32_reg_atomic unused[8];
};
/* Input function mux registers */
struct pic32_reg_in_mux {
u32 unused0;
u32 int1[4];
u32 unused1;
u32 t2ck[8];
u32 ic1[9];
u32 unused2;
u32 ocfar;
u32 unused3;
u32 u1rx;
u32 u1cts;
u32 u2rx;
u32 u2cts;
u32 u3rx;
u32 u3cts;
u32 u4rx;
u32 u4cts;
u32 u5rx;
u32 u5cts;
u32 u6rx;
u32 u6cts;
u32 unused4;
u32 sdi1;
u32 ss1;
u32 unused5;
u32 sdi2;
u32 ss2;
u32 unused6;
u32 sdi3;
u32 ss3;
u32 unused7;
u32 sdi4;
u32 ss4;
u32 unused8;
u32 sdi5;
u32 ss5;
u32 unused9;
u32 sdi6;
u32 ss6;
u32 c1rx;
u32 c2rx;
u32 refclki1;
u32 refclki2;
u32 refclki3;
u32 refclki4;
};
/* output mux register offset */
#define PPS_OUT(__port, __pin) \
(((__port) * PIC32_PINS_PER_PORT + (__pin)) << 2)
struct pic32_pinctrl_priv {
struct pic32_reg_in_mux *mux_in; /* mux input function */
struct pic32_reg_port *pinconf; /* pin configuration*/
void __iomem *mux_out; /* mux output function */
};
enum {
PERIPH_ID_UART1,
PERIPH_ID_UART2,
PERIPH_ID_ETH,
PERIPH_ID_USB,
PERIPH_ID_SDHCI,
PERIPH_ID_I2C1,
PERIPH_ID_I2C2,
PERIPH_ID_SPI1,
PERIPH_ID_SPI2,
PERIPH_ID_SQI,
};
static int pic32_pinconfig_one(struct pic32_pinctrl_priv *priv,
u32 port_nr, u32 pin, u32 param)
{
struct pic32_reg_port *port;
port = &priv->pinconf[port_nr];
switch (param) {
case PIN_CONFIG_PIC32_DIGITAL:
writel(BIT(pin), &port->ansel.clr);
break;
case PIN_CONFIG_PIC32_ANALOG:
writel(BIT(pin), &port->ansel.set);
break;
case PIN_CONFIG_INPUT_ENABLE:
writel(BIT(pin), &port->tris.set);
break;
case PIN_CONFIG_OUTPUT:
writel(BIT(pin), &port->tris.clr);
break;
case PIN_CONFIG_BIAS_PULL_UP:
writel(BIT(pin), &port->cnpu.set);
break;
case PIN_CONFIG_BIAS_PULL_DOWN:
writel(BIT(pin), &port->cnpd.set);
break;
case PIN_CONFIG_DRIVE_OPEN_DRAIN:
writel(BIT(pin), &port->odc.set);
break;
default:
break;
}
return 0;
}
static int pic32_pinconfig_set(struct pic32_pinctrl_priv *priv,
const struct pic32_pin_config *list, int count)
{
int i;
for (i = 0 ; i < count; i++)
pic32_pinconfig_one(priv, list[i].port,
list[i].pin, list[i].config);
return 0;
}
static void pic32_eth_pin_config(struct udevice *dev)
{
struct pic32_pinctrl_priv *priv = dev_get_priv(dev);
const struct pic32_pin_config configs[] = {
/* EMDC - D11 */
PIN_CONFIG(PIC32_PORT_D, 11, PIN_CONFIG_PIC32_DIGITAL),
PIN_CONFIG(PIC32_PORT_D, 11, PIN_CONFIG_OUTPUT),
/* ETXEN */
PIN_CONFIG(PIC32_PORT_D, 6, PIN_CONFIG_PIC32_DIGITAL),
PIN_CONFIG(PIC32_PORT_D, 6, PIN_CONFIG_OUTPUT),
/* ECRSDV */
PIN_CONFIG(PIC32_PORT_H, 13, PIN_CONFIG_PIC32_DIGITAL),
PIN_CONFIG(PIC32_PORT_H, 13, PIN_CONFIG_INPUT_ENABLE),
/* ERXD0 */
PIN_CONFIG(PIC32_PORT_H, 8, PIN_CONFIG_PIC32_DIGITAL),
PIN_CONFIG(PIC32_PORT_H, 8, PIN_CONFIG_INPUT_ENABLE),
PIN_CONFIG(PIC32_PORT_H, 8, PIN_CONFIG_BIAS_PULL_DOWN),
/* ERXD1 */
PIN_CONFIG(PIC32_PORT_H, 5, PIN_CONFIG_PIC32_DIGITAL),
PIN_CONFIG(PIC32_PORT_H, 5, PIN_CONFIG_INPUT_ENABLE),
PIN_CONFIG(PIC32_PORT_H, 5, PIN_CONFIG_BIAS_PULL_DOWN),
/* EREFCLK */
PIN_CONFIG(PIC32_PORT_J, 11, PIN_CONFIG_PIC32_DIGITAL),
PIN_CONFIG(PIC32_PORT_J, 11, PIN_CONFIG_INPUT_ENABLE),
/* ETXD1 */
PIN_CONFIG(PIC32_PORT_J, 9, PIN_CONFIG_PIC32_DIGITAL),
PIN_CONFIG(PIC32_PORT_J, 9, PIN_CONFIG_OUTPUT),
/* ETXD0 */
PIN_CONFIG(PIC32_PORT_J, 8, PIN_CONFIG_PIC32_DIGITAL),
PIN_CONFIG(PIC32_PORT_J, 8, PIN_CONFIG_OUTPUT),
/* EMDIO */
PIN_CONFIG(PIC32_PORT_J, 1, PIN_CONFIG_PIC32_DIGITAL),
PIN_CONFIG(PIC32_PORT_J, 1, PIN_CONFIG_INPUT_ENABLE),
/* ERXERR */
PIN_CONFIG(PIC32_PORT_F, 3, PIN_CONFIG_PIC32_DIGITAL),
PIN_CONFIG(PIC32_PORT_F, 3, PIN_CONFIG_INPUT_ENABLE),
};
pic32_pinconfig_set(priv, configs, ARRAY_SIZE(configs));
}
static int pic32_pinctrl_request(struct udevice *dev, int func, int flags)
{
struct pic32_pinctrl_priv *priv = dev_get_priv(dev);
switch (func) {
case PERIPH_ID_UART2:
/* PPS for U2 RX/TX */
writel(0x02, priv->mux_out + PPS_OUT(PIC32_PORT_G, 9));
writel(0x05, &priv->mux_in->u2rx); /* B0 */
/* set digital mode */
pic32_pinconfig_one(priv, PIC32_PORT_G, 9,
PIN_CONFIG_PIC32_DIGITAL);
pic32_pinconfig_one(priv, PIC32_PORT_B, 0,
PIN_CONFIG_PIC32_DIGITAL);
break;
case PERIPH_ID_ETH:
pic32_eth_pin_config(dev);
break;
default:
debug("%s: unknown-unhandled case\n", __func__);
break;
}
return 0;
}
static int pic32_pinctrl_get_periph_id(struct udevice *dev,
struct udevice *periph)
{
int ret;
u32 cell[2];
ret = fdtdec_get_int_array(gd->fdt_blob, dev_of_offset(periph),
"interrupts", cell, ARRAY_SIZE(cell));
if (ret < 0)
return -EINVAL;
/* interrupt number */
switch (cell[0]) {
case 112 ... 114:
return PERIPH_ID_UART1;
case 145 ... 147:
return PERIPH_ID_UART2;
case 109 ... 111:
return PERIPH_ID_SPI1;
case 142 ... 144:
return PERIPH_ID_SPI2;
case 115 ... 117:
return PERIPH_ID_I2C1;
case 148 ... 150:
return PERIPH_ID_I2C2;
case 132 ... 133:
return PERIPH_ID_USB;
case 169:
return PERIPH_ID_SQI;
case 191:
return PERIPH_ID_SDHCI;
case 153:
return PERIPH_ID_ETH;
default:
break;
}
return -ENOENT;
}
static int pic32_pinctrl_set_state_simple(struct udevice *dev,
struct udevice *periph)
{
int func;
debug("%s: periph %s\n", __func__, periph->name);
func = pic32_pinctrl_get_periph_id(dev, periph);
if (func < 0)
return func;
return pic32_pinctrl_request(dev, func, 0);
}
static struct pinctrl_ops pic32_pinctrl_ops = {
.set_state_simple = pic32_pinctrl_set_state_simple,
.request = pic32_pinctrl_request,
.get_periph_id = pic32_pinctrl_get_periph_id,
};
static int pic32_pinctrl_probe(struct udevice *dev)
{
struct pic32_pinctrl_priv *priv = dev_get_priv(dev);
struct fdt_resource res;
void *fdt = (void *)gd->fdt_blob;
int node = dev_of_offset(dev);
int ret;
ret = fdt_get_named_resource(fdt, node, "reg", "reg-names",
"ppsin", &res);
if (ret < 0) {
printf("pinctrl: resource \"ppsin\" not found\n");
return ret;
}
priv->mux_in = ioremap(res.start, fdt_resource_size(&res));
ret = fdt_get_named_resource(fdt, node, "reg", "reg-names",
"ppsout", &res);
if (ret < 0) {
printf("pinctrl: resource \"ppsout\" not found\n");
return ret;
}
priv->mux_out = ioremap(res.start, fdt_resource_size(&res));
ret = fdt_get_named_resource(fdt, node, "reg", "reg-names",
"port", &res);
if (ret < 0) {
printf("pinctrl: resource \"port\" not found\n");
return ret;
}
priv->pinconf = ioremap(res.start, fdt_resource_size(&res));
return 0;
}
static const struct udevice_id pic32_pinctrl_ids[] = {
{ .compatible = "microchip,pic32mzda-pinctrl" },
{ }
};
U_BOOT_DRIVER(pinctrl_pic32) = {
.name = "pinctrl_pic32",
.id = UCLASS_PINCTRL,
.of_match = pic32_pinctrl_ids,
.ops = &pic32_pinctrl_ops,
.probe = pic32_pinctrl_probe,
.bind = dm_scan_fdt_dev,
.priv_auto_alloc_size = sizeof(struct pic32_pinctrl_priv),
};
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