mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-08-24 17:59:32 +00:00
Code Issues Releases Wiki Activity
linux-stable/drivers/pinctrl/pinctrl-artpec6.c
Uwe Kleine-König b340412a87 pinctrl: artpec6: Convert to platform remove callback returning void 
The .remove() callback for a platform driver returns an int which makes
many driver authors wrongly assume it's possible to do error handling by
returning an error code. However the value returned is ignored (apart
from emitting a warning) and this typically results in resource leaks.

To improve here there is a quest to make the remove callback return
void. In the first step of this quest all drivers are converted to
.remove_new(), which already returns void. Eventually after all drivers
are converted, .remove_new() will be renamed to .remove().

Trivially convert this driver from always returning zero in the remove
callback to the void returning variant.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Acked-by: Jesper Nilsson <jesper.nilsson@axis.com>
Link: https://lore.kernel.org/r/20231009083856.222030-10-u.kleine-koenig@pengutronix.de
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2023-10-10 15:39:10 +02:00

998 lines
26 KiB
C
Raw Blame History

/*
* Driver for the Axis ARTPEC-6 pin controller
*
* Author: Chris Paterson <chris.paterson@linux.pieboy.co.uk>
*
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without any
* warranty of any kind, whether express or implied.
*/
#include <linux/device.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/pinctrl/pinconf-generic.h>
#include <linux/pinctrl/pinconf.h>
#include <linux/pinctrl/pinmux.h>
#include <linux/slab.h>
#include "core.h"
#include "pinconf.h"
#include "pinctrl-utils.h"
#define ARTPEC6_LAST_PIN 97 /* 97 pins in pinmux */
#define ARTPEC6_MAX_MUXABLE 35 /* Last pin with muxable function */
/* Pinmux control register bit definitions */
#define ARTPEC6_PINMUX_UDC0_MASK 0x00000001
#define ARTPEC6_PINMUX_UDC0_SHIFT 0
#define ARTPEC6_PINMUX_UDC1_MASK 0x00000002
#define ARTPEC6_PINMUX_UDC1_SHIFT 1
#define ARTPEC6_PINMUX_DRV_MASK 0x00000060
#define ARTPEC6_PINMUX_DRV_SHIFT 5
#define ARTPEC6_PINMUX_SEL_MASK 0x00003000
#define ARTPEC6_PINMUX_SEL_SHIFT 12
/* Pinmux configurations */
#define ARTPEC6_CONFIG_0 0
#define ARTPEC6_CONFIG_1 1
#define ARTPEC6_CONFIG_2 2
#define ARTPEC6_CONFIG_3 3
/* Pin drive strength options */
#define ARTPEC6_DRIVE_4mA 4
#define ARTPEC6_DRIVE_4mA_SET 0
#define ARTPEC6_DRIVE_6mA 6
#define ARTPEC6_DRIVE_6mA_SET 1
#define ARTPEC6_DRIVE_8mA 8
#define ARTPEC6_DRIVE_8mA_SET 2
#define ARTPEC6_DRIVE_9mA 9
#define ARTPEC6_DRIVE_9mA_SET 3
struct artpec6_pmx {
struct device *dev;
struct pinctrl_dev *pctl;
void __iomem *base;
struct pinctrl_pin_desc *pins;
unsigned int num_pins;
const struct artpec6_pin_group *pin_groups;
unsigned int num_pin_groups;
const struct artpec6_pmx_func *functions;
unsigned int num_functions;
};
struct artpec6_pin_group {
const char *name;
const unsigned int *pins;
const unsigned int num_pins;
unsigned char config;
};
struct artpec6_pmx_func {
const char *name;
const char * const *groups;
const unsigned int num_groups;
};
/* pins */
static struct pinctrl_pin_desc artpec6_pins[] = {
PINCTRL_PIN(0, "GPIO0"),
PINCTRL_PIN(1, "GPIO1"),
PINCTRL_PIN(2, "GPIO2"),
PINCTRL_PIN(3, "GPIO3"),
PINCTRL_PIN(4, "GPIO4"),
PINCTRL_PIN(5, "GPIO5"),
PINCTRL_PIN(6, "GPIO6"),
PINCTRL_PIN(7, "GPIO7"),
PINCTRL_PIN(8, "GPIO8"),
PINCTRL_PIN(9, "GPIO9"),
PINCTRL_PIN(10, "GPIO10"),
PINCTRL_PIN(11, "GPIO11"),
PINCTRL_PIN(12, "GPIO12"),
PINCTRL_PIN(13, "GPIO13"),
PINCTRL_PIN(14, "GPIO14"),
PINCTRL_PIN(15, "GPIO15"),
PINCTRL_PIN(16, "GPIO16"),
PINCTRL_PIN(17, "GPIO17"),
PINCTRL_PIN(18, "GPIO18"),
PINCTRL_PIN(19, "GPIO19"),
PINCTRL_PIN(20, "GPIO20"),
PINCTRL_PIN(21, "GPIO21"),
PINCTRL_PIN(22, "GPIO22"),
PINCTRL_PIN(23, "GPIO23"),
PINCTRL_PIN(24, "GPIO24"),
PINCTRL_PIN(25, "GPIO25"),
PINCTRL_PIN(26, "GPIO26"),
PINCTRL_PIN(27, "GPIO27"),
PINCTRL_PIN(28, "GPIO28"),
PINCTRL_PIN(29, "GPIO29"),
PINCTRL_PIN(30, "GPIO30"),
PINCTRL_PIN(31, "GPIO31"),
PINCTRL_PIN(32, "UART3_TXD"),
PINCTRL_PIN(33, "UART3_RXD"),
PINCTRL_PIN(34, "UART3_RTS"),
PINCTRL_PIN(35, "UART3_CTS"),
PINCTRL_PIN(36, "NF_ALE"),
PINCTRL_PIN(37, "NF_CE0_N"),
PINCTRL_PIN(38, "NF_CE1_N"),
PINCTRL_PIN(39, "NF_CLE"),
PINCTRL_PIN(40, "NF_RE_N"),
PINCTRL_PIN(41, "NF_WE_N"),
PINCTRL_PIN(42, "NF_WP0_N"),
PINCTRL_PIN(43, "NF_WP1_N"),
PINCTRL_PIN(44, "NF_IO0"),
PINCTRL_PIN(45, "NF_IO1"),
PINCTRL_PIN(46, "NF_IO2"),
PINCTRL_PIN(47, "NF_IO3"),
PINCTRL_PIN(48, "NF_IO4"),
PINCTRL_PIN(49, "NF_IO5"),
PINCTRL_PIN(50, "NF_IO6"),
PINCTRL_PIN(51, "NF_IO7"),
PINCTRL_PIN(52, "NF_RB0_N"),
PINCTRL_PIN(53, "SDIO0_CLK"),
PINCTRL_PIN(54, "SDIO0_CMD"),
PINCTRL_PIN(55, "SDIO0_DAT0"),
PINCTRL_PIN(56, "SDIO0_DAT1"),
PINCTRL_PIN(57, "SDIO0_DAT2"),
PINCTRL_PIN(58, "SDIO0_DAT3"),
PINCTRL_PIN(59, "SDI0_CD"),
PINCTRL_PIN(60, "SDI0_WP"),
PINCTRL_PIN(61, "SDIO1_CLK"),
PINCTRL_PIN(62, "SDIO1_CMD"),
PINCTRL_PIN(63, "SDIO1_DAT0"),
PINCTRL_PIN(64, "SDIO1_DAT1"),
PINCTRL_PIN(65, "SDIO1_DAT2"),
PINCTRL_PIN(66, "SDIO1_DAT3"),
PINCTRL_PIN(67, "SDIO1_CD"),
PINCTRL_PIN(68, "SDIO1_WP"),
PINCTRL_PIN(69, "GBE_REFCLk"),
PINCTRL_PIN(70, "GBE_GTX_CLK"),
PINCTRL_PIN(71, "GBE_TX_CLK"),
PINCTRL_PIN(72, "GBE_TX_EN"),
PINCTRL_PIN(73, "GBE_TX_ER"),
PINCTRL_PIN(74, "GBE_TXD0"),
PINCTRL_PIN(75, "GBE_TXD1"),
PINCTRL_PIN(76, "GBE_TXD2"),
PINCTRL_PIN(77, "GBE_TXD3"),
PINCTRL_PIN(78, "GBE_TXD4"),
PINCTRL_PIN(79, "GBE_TXD5"),
PINCTRL_PIN(80, "GBE_TXD6"),
PINCTRL_PIN(81, "GBE_TXD7"),
PINCTRL_PIN(82, "GBE_RX_CLK"),
PINCTRL_PIN(83, "GBE_RX_DV"),
PINCTRL_PIN(84, "GBE_RX_ER"),
PINCTRL_PIN(85, "GBE_RXD0"),
PINCTRL_PIN(86, "GBE_RXD1"),
PINCTRL_PIN(87, "GBE_RXD2"),
PINCTRL_PIN(88, "GBE_RXD3"),
PINCTRL_PIN(89, "GBE_RXD4"),
PINCTRL_PIN(90, "GBE_RXD5"),
PINCTRL_PIN(91, "GBE_RXD6"),
PINCTRL_PIN(92, "GBE_RXD7"),
PINCTRL_PIN(93, "GBE_CRS"),
PINCTRL_PIN(94, "GBE_COL"),
PINCTRL_PIN(95, "GBE_MDC"),
PINCTRL_PIN(96, "GBE_MDIO"),
};
static const unsigned int cpuclkout_pins0[] = { 0 };
static const unsigned int udlclkout_pins0[] = { 1 };
static const unsigned int i2c1_pins0[] = { 2, 3 };
static const unsigned int i2c2_pins0[] = { 4, 5 };
static const unsigned int i2c3_pins0[] = { 6, 7 };
static const unsigned int i2s0_pins0[] = { 8, 9, 10, 11 };
static const unsigned int i2s1_pins0[] = { 12, 13, 14, 15 };
static const unsigned int i2srefclk_pins0[] = { 19 };
static const unsigned int spi0_pins0[] = { 12, 13, 14, 15 };
static const unsigned int spi1_pins0[] = { 16, 17, 18, 19 };
static const unsigned int pciedebug_pins0[] = { 12, 13, 14, 15 };
static const unsigned int uart0_pins0[] = { 16, 17, 18, 19, 20,
21, 22, 23, 24, 25 };
static const unsigned int uart0_pins1[] = { 20, 21, 22, 23 };
static const unsigned int uart1_pins0[] = { 24, 25, 26, 27 };
static const unsigned int uart2_pins0[] = { 26, 27, 28, 29, 30,
31, 32, 33, 34, 35 };
static const unsigned int uart2_pins1[] = { 28, 29, 30, 31 };
static const unsigned int uart3_pins0[] = { 32, 33, 34, 35 };
static const unsigned int uart4_pins0[] = { 20, 21, 22, 23 };
static const unsigned int uart5_pins0[] = { 28, 29, 30, 31 };
static const unsigned int nand_pins0[] = { 36, 37, 38, 39, 40, 41,
42, 43, 44, 45, 46, 47,
48, 49, 50, 51, 52 };
static const unsigned int sdio0_pins0[] = { 53, 54, 55, 56, 57, 58, 59, 60 };
static const unsigned int sdio1_pins0[] = { 61, 62, 63, 64, 65, 66, 67, 68 };
static const unsigned int ethernet_pins0[] = { 69, 70, 71, 72, 73, 74, 75,
76, 77, 78, 79, 80, 81, 82,
83, 84, 85, 86, 87, 88, 89,
90, 91, 92, 93, 94, 95, 96 };
static const struct artpec6_pin_group artpec6_pin_groups[] = {
{
.name = "cpuclkoutgrp0",
.pins = cpuclkout_pins0,
.num_pins = ARRAY_SIZE(cpuclkout_pins0),
.config = ARTPEC6_CONFIG_1,
},
{
.name = "udlclkoutgrp0",
.pins = udlclkout_pins0,
.num_pins = ARRAY_SIZE(udlclkout_pins0),
.config = ARTPEC6_CONFIG_1,
},
{
.name = "i2c1grp0",
.pins = i2c1_pins0,
.num_pins = ARRAY_SIZE(i2c1_pins0),
.config = ARTPEC6_CONFIG_1,
},
{
.name = "i2c2grp0",
.pins = i2c2_pins0,
.num_pins = ARRAY_SIZE(i2c2_pins0),
.config = ARTPEC6_CONFIG_1,
},
{
.name = "i2c3grp0",
.pins = i2c3_pins0,
.num_pins = ARRAY_SIZE(i2c3_pins0),
.config = ARTPEC6_CONFIG_1,
},
{
.name = "i2s0grp0",
.pins = i2s0_pins0,
.num_pins = ARRAY_SIZE(i2s0_pins0),
.config = ARTPEC6_CONFIG_1,
},
{
.name = "i2s1grp0",
.pins = i2s1_pins0,
.num_pins = ARRAY_SIZE(i2s1_pins0),
.config = ARTPEC6_CONFIG_1,
},
{
.name = "i2srefclkgrp0",
.pins = i2srefclk_pins0,
.num_pins = ARRAY_SIZE(i2srefclk_pins0),
.config = ARTPEC6_CONFIG_3,
},
{
.name = "spi0grp0",
.pins = spi0_pins0,
.num_pins = ARRAY_SIZE(spi0_pins0),
.config = ARTPEC6_CONFIG_2,
},
{
.name = "spi1grp0",
.pins = spi1_pins0,
.num_pins = ARRAY_SIZE(spi1_pins0),
.config = ARTPEC6_CONFIG_2,
},
{
.name = "pciedebuggrp0",
.pins = pciedebug_pins0,
.num_pins = ARRAY_SIZE(pciedebug_pins0),
.config = ARTPEC6_CONFIG_3,
},
{
.name = "uart0grp0", /* All pins. */
.pins = uart0_pins0,
.num_pins = ARRAY_SIZE(uart0_pins0),
.config = ARTPEC6_CONFIG_1,
},
{
.name = "uart0grp1", /* RX/TX and RTS/CTS */
.pins = uart0_pins1,
.num_pins = ARRAY_SIZE(uart0_pins1),
.config = ARTPEC6_CONFIG_1,
},
{
.name = "uart0grp2", /* Only RX/TX pins. */
.pins = uart0_pins1,
.num_pins = ARRAY_SIZE(uart0_pins1) - 2,
.config = ARTPEC6_CONFIG_1,
},
{
.name = "uart1grp0", /* RX/TX and RTS/CTS */
.pins = uart1_pins0,
.num_pins = ARRAY_SIZE(uart1_pins0),
.config = ARTPEC6_CONFIG_2,
},
{
.name = "uart1grp1", /* Only RX/TX pins. */
.pins = uart1_pins0,
.num_pins = 2,
.config = ARTPEC6_CONFIG_2,
},
{
.name = "uart2grp0", /* Full pinout */
.pins = uart2_pins0,
.num_pins = ARRAY_SIZE(uart2_pins0),
.config = ARTPEC6_CONFIG_1,
},
{
.name = "uart2grp1", /* RX/TX and RTS/CTS */
.pins = uart2_pins1,
.num_pins = ARRAY_SIZE(uart2_pins1),
.config = ARTPEC6_CONFIG_1,
},
{
.name = "uart2grp2", /* Only RX/TX */
.pins = uart2_pins1,
.num_pins = 2,
.config = ARTPEC6_CONFIG_1,
},
{
.name = "uart3grp0", /* RX/TX and CTS/RTS */
.pins = uart3_pins0,
.num_pins = ARRAY_SIZE(uart3_pins0),
.config = ARTPEC6_CONFIG_0,
},
{
.name = "uart3grp1", /* Only RX/TX */
.pins = uart3_pins0,
.num_pins = ARRAY_SIZE(uart3_pins0),
.config = ARTPEC6_CONFIG_0,
},
{
.name = "uart4grp0",
.pins = uart4_pins0,
.num_pins = ARRAY_SIZE(uart4_pins0),
.config = ARTPEC6_CONFIG_2,
},
{
.name = "uart5grp0", /* TX/RX and RTS/CTS */
.pins = uart5_pins0,
.num_pins = ARRAY_SIZE(uart5_pins0),
.config = ARTPEC6_CONFIG_2,
},
{
.name = "uart5grp1", /* Only TX/RX */
.pins = uart5_pins0,
.num_pins = 2,
.config = ARTPEC6_CONFIG_2,
},
{
.name = "uart5nocts", /* TX/RX/RTS */
.pins = uart5_pins0,
.num_pins = ARRAY_SIZE(uart5_pins0) - 1,
.config = ARTPEC6_CONFIG_2,
},
{
.name = "nandgrp0",
.pins = nand_pins0,
.num_pins = ARRAY_SIZE(nand_pins0),
.config = ARTPEC6_CONFIG_0,
},
{
.name = "sdio0grp0",
.pins = sdio0_pins0,
.num_pins = ARRAY_SIZE(sdio0_pins0),
.config = ARTPEC6_CONFIG_0,
},
{
.name = "sdio1grp0",
.pins = sdio1_pins0,
.num_pins = ARRAY_SIZE(sdio1_pins0),
.config = ARTPEC6_CONFIG_0,
},
{
.name = "ethernetgrp0",
.pins = ethernet_pins0,
.num_pins = ARRAY_SIZE(ethernet_pins0),
.config = ARTPEC6_CONFIG_0,
},
};
struct pin_register {
unsigned int start;
unsigned int end;
unsigned int reg_base;
};
/*
* The register map has two holes where the pin number
* no longer fits directly with the register offset.
* This table allows us to map this easily.
*/
static const struct pin_register pin_register[] = {
{ 0, 35, 0x0 }, /* 0x0 - 0x8c */
{ 36, 52, 0x100 }, /* 0x100 - 0x140 */
{ 53, 96, 0x180 }, /* 0x180 - 0x22c */
};
static unsigned int artpec6_pmx_reg_offset(unsigned int pin)
{
int i;
for (i = 0; i < ARRAY_SIZE(pin_register); i++) {
if (pin <= pin_register[i].end) {
return (pin - pin_register[i].start) * 4 +
pin_register[i].reg_base;
}
}
/*
* Anything we return here is wrong, but we can only
* get here if pin is outside registered range.
*/
pr_err("%s: Impossible pin %d\n", __func__, pin);
return 0;
}
static int artpec6_get_groups_count(struct pinctrl_dev *pctldev)
{
return ARRAY_SIZE(artpec6_pin_groups);
}
static const char *artpec6_get_group_name(struct pinctrl_dev *pctldev,
unsigned int group)
{
return artpec6_pin_groups[group].name;
}
static int artpec6_get_group_pins(struct pinctrl_dev *pctldev,
unsigned int group,
const unsigned int **pins,
unsigned int *num_pins)
{
*pins = (unsigned int *)artpec6_pin_groups[group].pins;
*num_pins = artpec6_pin_groups[group].num_pins;
return 0;
}
static int artpec6_pconf_drive_mA_to_field(unsigned int mA)
{
switch (mA) {
case ARTPEC6_DRIVE_4mA:
return ARTPEC6_DRIVE_4mA_SET;
case ARTPEC6_DRIVE_6mA:
return ARTPEC6_DRIVE_6mA_SET;
case ARTPEC6_DRIVE_8mA:
return ARTPEC6_DRIVE_8mA_SET;
case ARTPEC6_DRIVE_9mA:
return ARTPEC6_DRIVE_9mA_SET;
default:
return -EINVAL;
}
}
static unsigned int artpec6_pconf_drive_field_to_mA(int field)
{
switch (field) {
case ARTPEC6_DRIVE_4mA_SET:
return ARTPEC6_DRIVE_4mA;
case ARTPEC6_DRIVE_6mA_SET:
return ARTPEC6_DRIVE_6mA;
case ARTPEC6_DRIVE_8mA_SET:
return ARTPEC6_DRIVE_8mA;
case ARTPEC6_DRIVE_9mA_SET:
return ARTPEC6_DRIVE_9mA;
default:
/* Shouldn't happen */
return 0;
}
}
static const struct pinctrl_ops artpec6_pctrl_ops = {
.get_group_pins = artpec6_get_group_pins,
.get_groups_count = artpec6_get_groups_count,
.get_group_name = artpec6_get_group_name,
.dt_node_to_map = pinconf_generic_dt_node_to_map_all,
.dt_free_map = pinctrl_utils_free_map,
};
static const char * const gpiogrps[] = {
"cpuclkoutgrp0", "udlclkoutgrp0", "i2c1grp0", "i2c2grp0",
"i2c3grp0", "i2s0grp0", "i2s1grp0", "i2srefclkgrp0",
"spi0grp0", "spi1grp0", "pciedebuggrp0", "uart0grp0",
"uart0grp1", "uart0grp2", "uart1grp0", "uart1grp1",
"uart2grp0", "uart2grp1", "uart2grp2", "uart4grp0", "uart5grp0",
"uart5grp1", "uart5nocts",
};
static const char * const cpuclkoutgrps[] = { "cpuclkoutgrp0" };
static const char * const udlclkoutgrps[] = { "udlclkoutgrp0" };
static const char * const i2c1grps[] = { "i2c1grp0" };
static const char * const i2c2grps[] = { "i2c2grp0" };
static const char * const i2c3grps[] = { "i2c3grp0" };
static const char * const i2s0grps[] = { "i2s0grp0" };
static const char * const i2s1grps[] = { "i2s1grp0" };
static const char * const i2srefclkgrps[] = { "i2srefclkgrp0" };
static const char * const spi0grps[] = { "spi0grp0" };
static const char * const spi1grps[] = { "spi1grp0" };
static const char * const pciedebuggrps[] = { "pciedebuggrp0" };
static const char * const uart0grps[] = { "uart0grp0", "uart0grp1",
"uart0grp2" };
static const char * const uart1grps[] = { "uart1grp0", "uart1grp1" };
static const char * const uart2grps[] = { "uart2grp0", "uart2grp1",
"uart2grp2" };
static const char * const uart3grps[] = { "uart3grp0" };
static const char * const uart4grps[] = { "uart4grp0", "uart4grp1" };
static const char * const uart5grps[] = { "uart5grp0", "uart5grp1",
"uart5nocts" };
static const char * const nandgrps[] = { "nandgrp0" };
static const char * const sdio0grps[] = { "sdio0grp0" };
static const char * const sdio1grps[] = { "sdio1grp0" };
static const char * const ethernetgrps[] = { "ethernetgrp0" };
static const struct artpec6_pmx_func artpec6_pmx_functions[] = {
{
.name = "gpio",
.groups = gpiogrps,
.num_groups = ARRAY_SIZE(gpiogrps),
},
{
.name = "cpuclkout",
.groups = cpuclkoutgrps,
.num_groups = ARRAY_SIZE(cpuclkoutgrps),
},
{
.name = "udlclkout",
.groups = udlclkoutgrps,
.num_groups = ARRAY_SIZE(udlclkoutgrps),
},
{
.name = "i2c1",
.groups = i2c1grps,
.num_groups = ARRAY_SIZE(i2c1grps),
},
{
.name = "i2c2",
.groups = i2c2grps,
.num_groups = ARRAY_SIZE(i2c2grps),
},
{
.name = "i2c3",
.groups = i2c3grps,
.num_groups = ARRAY_SIZE(i2c3grps),
},
{
.name = "i2s0",
.groups = i2s0grps,
.num_groups = ARRAY_SIZE(i2s0grps),
},
{
.name = "i2s1",
.groups = i2s1grps,
.num_groups = ARRAY_SIZE(i2s1grps),
},
{
.name = "i2srefclk",
.groups = i2srefclkgrps,
.num_groups = ARRAY_SIZE(i2srefclkgrps),
},
{
.name = "spi0",
.groups = spi0grps,
.num_groups = ARRAY_SIZE(spi0grps),
},
{
.name = "spi1",
.groups = spi1grps,
.num_groups = ARRAY_SIZE(spi1grps),
},
{
.name = "pciedebug",
.groups = pciedebuggrps,
.num_groups = ARRAY_SIZE(pciedebuggrps),
},
{
.name = "uart0",
.groups = uart0grps,
.num_groups = ARRAY_SIZE(uart0grps),
},
{
.name = "uart1",
.groups = uart1grps,
.num_groups = ARRAY_SIZE(uart1grps),
},
{
.name = "uart2",
.groups = uart2grps,
.num_groups = ARRAY_SIZE(uart2grps),
},
{
.name = "uart3",
.groups = uart3grps,
.num_groups = ARRAY_SIZE(uart3grps),
},
{
.name = "uart4",
.groups = uart4grps,
.num_groups = ARRAY_SIZE(uart4grps),
},
{
.name = "uart5",
.groups = uart5grps,
.num_groups = ARRAY_SIZE(uart5grps),
},
{
.name = "nand",
.groups = nandgrps,
.num_groups = ARRAY_SIZE(nandgrps),
},
{
.name = "sdio0",
.groups = sdio0grps,
.num_groups = ARRAY_SIZE(sdio0grps),
},
{
.name = "sdio1",
.groups = sdio1grps,
.num_groups = ARRAY_SIZE(sdio1grps),
},
{
.name = "ethernet",
.groups = ethernetgrps,
.num_groups = ARRAY_SIZE(ethernetgrps),
},
};
static int artpec6_pmx_get_functions_count(struct pinctrl_dev *pctldev)
{
return ARRAY_SIZE(artpec6_pmx_functions);
}
static const char *artpec6_pmx_get_fname(struct pinctrl_dev *pctldev,
unsigned int function)
{
return artpec6_pmx_functions[function].name;
}
static int artpec6_pmx_get_fgroups(struct pinctrl_dev *pctldev,
unsigned int function,
const char * const **groups,
unsigned int * const num_groups)
{
*groups = artpec6_pmx_functions[function].groups;
*num_groups = artpec6_pmx_functions[function].num_groups;
return 0;
}
static void artpec6_pmx_select_func(struct pinctrl_dev *pctldev,
unsigned int function, unsigned int group,
bool enable)
{
unsigned int regval, val;
unsigned int reg;
int i;
struct artpec6_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
for (i = 0; i < artpec6_pin_groups[group].num_pins; i++) {
/*
* Registers for pins above a ARTPEC6_MAX_MUXABLE
* do not have a SEL field and are always selected.
*/
if (artpec6_pin_groups[group].pins[i] > ARTPEC6_MAX_MUXABLE)
continue;
if (!strcmp(artpec6_pmx_get_fname(pctldev, function), "gpio")) {
/* GPIO is always config 0 */
val = ARTPEC6_CONFIG_0 << ARTPEC6_PINMUX_SEL_SHIFT;
} else {
if (enable)
val = artpec6_pin_groups[group].config
<< ARTPEC6_PINMUX_SEL_SHIFT;
else
val = ARTPEC6_CONFIG_0
<< ARTPEC6_PINMUX_SEL_SHIFT;
}
reg = artpec6_pmx_reg_offset(artpec6_pin_groups[group].pins[i]);
regval = readl(pmx->base + reg);
regval &= ~ARTPEC6_PINMUX_SEL_MASK;
regval |= val;
writel(regval, pmx->base + reg);
}
}
static int artpec6_pmx_set(struct pinctrl_dev *pctldev,
unsigned int function,
unsigned int group)
{
struct artpec6_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
dev_dbg(pmx->dev, "enabling %s function for pin group %s\n",
artpec6_pmx_get_fname(pctldev, function),
artpec6_get_group_name(pctldev, group));
artpec6_pmx_select_func(pctldev, function, group, true);
return 0;
}
static int artpec6_pmx_request_gpio(struct pinctrl_dev *pctldev,
struct pinctrl_gpio_range *range,
unsigned int pin)
{
struct artpec6_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
unsigned int reg = artpec6_pmx_reg_offset(pin);
u32 val;
if (pin >= 32)
return -EINVAL;
val = readl_relaxed(pmx->base + reg);
val &= ~ARTPEC6_PINMUX_SEL_MASK;
val |= ARTPEC6_CONFIG_0 << ARTPEC6_PINMUX_SEL_SHIFT;
writel_relaxed(val, pmx->base + reg);
return 0;
}
static const struct pinmux_ops artpec6_pmx_ops = {
.get_functions_count = artpec6_pmx_get_functions_count,
.get_function_name = artpec6_pmx_get_fname,
.get_function_groups = artpec6_pmx_get_fgroups,
.set_mux = artpec6_pmx_set,
.gpio_request_enable = artpec6_pmx_request_gpio,
};
static int artpec6_pconf_get(struct pinctrl_dev *pctldev, unsigned int pin,
unsigned long *config)
{
struct artpec6_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
enum pin_config_param param = pinconf_to_config_param(*config);
unsigned int regval;
/* Check for valid pin */
if (pin >= pmx->num_pins) {
dev_dbg(pmx->dev, "pinconf is not supported for pin %s\n",
pmx->pins[pin].name);
return -ENOTSUPP;
}
dev_dbg(pmx->dev, "getting configuration for pin %s\n",
pmx->pins[pin].name);
/* Read pin register values */
regval = readl(pmx->base + artpec6_pmx_reg_offset(pin));
/* If valid, get configuration for parameter */
switch (param) {
case PIN_CONFIG_BIAS_DISABLE:
if (!(regval & ARTPEC6_PINMUX_UDC1_MASK))
return -EINVAL;
break;
case PIN_CONFIG_BIAS_PULL_UP:
case PIN_CONFIG_BIAS_PULL_DOWN:
if (regval & ARTPEC6_PINMUX_UDC1_MASK)
return -EINVAL;
regval = regval & ARTPEC6_PINMUX_UDC0_MASK;
if ((param == PIN_CONFIG_BIAS_PULL_UP && !regval) ||
(param == PIN_CONFIG_BIAS_PULL_DOWN && regval))
return -EINVAL;
break;
case PIN_CONFIG_DRIVE_STRENGTH:
regval = (regval & ARTPEC6_PINMUX_DRV_MASK)
>> ARTPEC6_PINMUX_DRV_SHIFT;
regval = artpec6_pconf_drive_field_to_mA(regval);
*config = pinconf_to_config_packed(param, regval);
break;
default:
return -ENOTSUPP;
}
return 0;
}
/*
* Valid combinations of param and arg:
*
* param arg
* PIN_CONFIG_BIAS_DISABLE: x (disable bias)
* PIN_CONFIG_BIAS_PULL_UP: 1 (pull up bias + enable)
* PIN_CONFIG_BIAS_PULL_DOWN: 1 (pull down bias + enable)
* PIN_CONFIG_DRIVE_STRENGTH: x (4mA, 6mA, 8mA, 9mA)
*
* All other args are invalid. All other params are not supported.
*/
static int artpec6_pconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
unsigned long *configs, unsigned int num_configs)
{
struct artpec6_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
enum pin_config_param param;
unsigned int arg;
unsigned int regval;
void __iomem *reg;
int i;
/* Check for valid pin */
if (pin >= pmx->num_pins) {
dev_dbg(pmx->dev, "pinconf is not supported for pin %s\n",
pmx->pins[pin].name);
return -ENOTSUPP;
}
dev_dbg(pmx->dev, "setting configuration for pin %s\n",
pmx->pins[pin].name);
reg = pmx->base + artpec6_pmx_reg_offset(pin);
/* For each config */
for (i = 0; i < num_configs; i++) {
int drive;
param = pinconf_to_config_param(configs[i]);
arg = pinconf_to_config_argument(configs[i]);
switch (param) {
case PIN_CONFIG_BIAS_DISABLE:
regval = readl(reg);
regval |= (1 << ARTPEC6_PINMUX_UDC1_SHIFT);
writel(regval, reg);
break;
case PIN_CONFIG_BIAS_PULL_UP:
if (arg != 1) {
dev_dbg(pctldev->dev, "%s: arg %u out of range\n",
__func__, arg);
return -EINVAL;
}
regval = readl(reg);
regval |= (arg << ARTPEC6_PINMUX_UDC0_SHIFT);
regval &= ~ARTPEC6_PINMUX_UDC1_MASK; /* Enable */
writel(regval, reg);
break;
case PIN_CONFIG_BIAS_PULL_DOWN:
if (arg != 1) {
dev_dbg(pctldev->dev, "%s: arg %u out of range\n",
__func__, arg);
return -EINVAL;
}
regval = readl(reg);
regval &= ~(arg << ARTPEC6_PINMUX_UDC0_SHIFT);
regval &= ~ARTPEC6_PINMUX_UDC1_MASK; /* Enable */
writel(regval, reg);
break;
case PIN_CONFIG_DRIVE_STRENGTH:
drive = artpec6_pconf_drive_mA_to_field(arg);
if (drive < 0) {
dev_dbg(pctldev->dev, "%s: arg %u out of range\n",
__func__, arg);
return -EINVAL;
}
regval = readl(reg);
regval &= ~ARTPEC6_PINMUX_DRV_MASK;
regval |= (drive << ARTPEC6_PINMUX_DRV_SHIFT);
writel(regval, reg);
break;
default:
dev_dbg(pmx->dev, "parameter not supported\n");
return -ENOTSUPP;
}
}
return 0;
}
static int artpec6_pconf_group_set(struct pinctrl_dev *pctldev,
unsigned int group, unsigned long *configs,
unsigned int num_configs)
{
unsigned int num_pins, current_pin;
int ret;
dev_dbg(pctldev->dev, "setting group %s configuration\n",
artpec6_get_group_name(pctldev, group));
num_pins = artpec6_pin_groups[group].num_pins;
for (current_pin = 0; current_pin < num_pins; current_pin++) {
ret = artpec6_pconf_set(pctldev,
artpec6_pin_groups[group].pins[current_pin],
configs, num_configs);
if (ret < 0)
return ret;
}
return 0;
}
static const struct pinconf_ops artpec6_pconf_ops = {
.is_generic = true,
.pin_config_get = artpec6_pconf_get,
.pin_config_set = artpec6_pconf_set,
.pin_config_group_set = artpec6_pconf_group_set,
};
static struct pinctrl_desc artpec6_desc = {
.name = "artpec6-pinctrl",
.owner = THIS_MODULE,
.pins = artpec6_pins,
.npins = ARRAY_SIZE(artpec6_pins),
.pctlops = &artpec6_pctrl_ops,
.pmxops = &artpec6_pmx_ops,
.confops = &artpec6_pconf_ops,
};
/* The reset values say 4mA, but we want 8mA as default. */
static void artpec6_pmx_reset(struct artpec6_pmx *pmx)
{
void __iomem *base = pmx->base;
int i;
for (i = 0; i < ARTPEC6_LAST_PIN; i++) {
u32 val;
val = readl_relaxed(base + artpec6_pmx_reg_offset(i));
val &= ~ARTPEC6_PINMUX_DRV_MASK;
val |= ARTPEC6_DRIVE_8mA_SET << ARTPEC6_PINMUX_DRV_SHIFT;
writel_relaxed(val, base + artpec6_pmx_reg_offset(i));
}
}
static int artpec6_pmx_probe(struct platform_device *pdev)
{
struct artpec6_pmx *pmx;
pmx = devm_kzalloc(&pdev->dev, sizeof(*pmx), GFP_KERNEL);
if (!pmx)
return -ENOMEM;
pmx->dev = &pdev->dev;
pmx->base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(pmx->base))
return PTR_ERR(pmx->base);
artpec6_pmx_reset(pmx);
pmx->pins = artpec6_pins;
pmx->num_pins = ARRAY_SIZE(artpec6_pins);
pmx->functions = artpec6_pmx_functions;
pmx->num_functions = ARRAY_SIZE(artpec6_pmx_functions);
pmx->pin_groups = artpec6_pin_groups;
pmx->num_pin_groups = ARRAY_SIZE(artpec6_pin_groups);
pmx->pctl = pinctrl_register(&artpec6_desc, &pdev->dev, pmx);
if (IS_ERR(pmx->pctl)) {
dev_err(&pdev->dev, "could not register pinctrl driver\n");
return PTR_ERR(pmx->pctl);
}
platform_set_drvdata(pdev, pmx);
dev_info(&pdev->dev, "initialised Axis ARTPEC-6 pinctrl driver\n");
return 0;
}
static void artpec6_pmx_remove(struct platform_device *pdev)
{
struct artpec6_pmx *pmx = platform_get_drvdata(pdev);
pinctrl_unregister(pmx->pctl);
}
static const struct of_device_id artpec6_pinctrl_match[] = {
{ .compatible = "axis,artpec6-pinctrl" },
{},
};
static struct platform_driver artpec6_pmx_driver = {
.driver = {
.name = "artpec6-pinctrl",
.of_match_table = artpec6_pinctrl_match,
},
.probe = artpec6_pmx_probe,
.remove_new = artpec6_pmx_remove,
};
static int __init artpec6_pmx_init(void)
{
return platform_driver_register(&artpec6_pmx_driver);
}
arch_initcall(artpec6_pmx_init);
Reference in a new issue View git blame Copy permalink