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linux-next/drivers/pinctrl/bcm/pinctrl-ns2-mux.c
Young Xiao f38b506923 pinctrl: ns2: Fix potential NULL dereference 
platform_get_resource() may fail and return NULL, so we should
better check it's return value to avoid a NULL pointer dereference
a bit later in the code.

Signed-off-by: Young Xiao <92siuyang@gmail.com>
Reviewed-by: Ray Jui <ray.jui@broadcom.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2019-06-08 01:29:42 +02:00

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/* Copyright (C) 2016 Broadcom Corporation
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation version 2.
*
* This program is distributed "as is" WITHOUT ANY WARRANTY of any
* kind, whether express or implied; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* This file contains the Northstar2 IOMUX driver that supports group
* based PINMUX configuration. The PWM is functional only when the
* corresponding mfio pin group is selected as gpio.
*/
#include <linux/err.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/pinctrl/pinconf.h>
#include <linux/pinctrl/pinconf-generic.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/pinctrl/pinmux.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include "../core.h"
#include "../pinctrl-utils.h"
#define NS2_NUM_IOMUX 19
#define NS2_NUM_PWM_MUX 4
#define NS2_PIN_MUX_BASE0 0x00
#define NS2_PIN_MUX_BASE1 0x01
#define NS2_PIN_CONF_BASE 0x02
#define NS2_MUX_PAD_FUNC1_OFFSET 0x04
#define NS2_PIN_SRC_MASK 0x01
#define NS2_PIN_PULL_MASK 0x03
#define NS2_PIN_DRIVE_STRENGTH_MASK 0x07
#define NS2_PIN_PULL_UP 0x01
#define NS2_PIN_PULL_DOWN 0x02
#define NS2_PIN_INPUT_EN_MASK 0x01
/*
* Northstar2 IOMUX register description
*
* @base: base address number
* @offset: register offset for mux configuration of a group
* @shift: bit shift for mux configuration of a group
* @mask: mask bits
* @alt: alternate function to set to
*/
struct ns2_mux {
unsigned int base;
unsigned int offset;
unsigned int shift;
unsigned int mask;
unsigned int alt;
};
/*
* Keep track of Northstar2 IOMUX configuration and prevent double
* configuration
*
* @ns2_mux: Northstar2 IOMUX register description
* @is_configured: flag to indicate whether a mux setting has already
* been configured
*/
struct ns2_mux_log {
struct ns2_mux mux;
bool is_configured;
};
/*
* Group based IOMUX configuration
*
* @name: name of the group
* @pins: array of pins used by this group
* @num_pins: total number of pins used by this group
* @mux: Northstar2 group based IOMUX configuration
*/
struct ns2_pin_group {
const char *name;
const unsigned int *pins;
const unsigned int num_pins;
const struct ns2_mux mux;
};
/*
* Northstar2 mux function and supported pin groups
*
* @name: name of the function
* @groups: array of groups that can be supported by this function
* @num_groups: total number of groups that can be supported by function
*/
struct ns2_pin_function {
const char *name;
const char * const *groups;
const unsigned int num_groups;
};
/*
* Northstar2 IOMUX pinctrl core
*
* @pctl: pointer to pinctrl_dev
* @dev: pointer to device
* @base0: first IOMUX register base
* @base1: second IOMUX register base
* @pinconf_base: configuration register base
* @groups: pointer to array of groups
* @num_groups: total number of groups
* @functions: pointer to array of functions
* @num_functions: total number of functions
* @mux_log: pointer to the array of mux logs
* @lock: lock to protect register access
*/
struct ns2_pinctrl {
struct pinctrl_dev *pctl;
struct device *dev;
void __iomem *base0;
void __iomem *base1;
void __iomem *pinconf_base;
const struct ns2_pin_group *groups;
unsigned int num_groups;
const struct ns2_pin_function *functions;
unsigned int num_functions;
struct ns2_mux_log *mux_log;
spinlock_t lock;
};
/*
* Pin configuration info
*
* @base: base address number
* @offset: register offset from base
* @src_shift: slew rate control bit shift in the register
* @input_en: input enable control bit shift
* @pull_shift: pull-up/pull-down control bit shift in the register
* @drive_shift: drive strength control bit shift in the register
*/
struct ns2_pinconf {
unsigned int base;
unsigned int offset;
unsigned int src_shift;
unsigned int input_en;
unsigned int pull_shift;
unsigned int drive_shift;
};
/*
* Description of a pin in Northstar2
*
* @pin: pin number
* @name: pin name
* @pin_conf: pin configuration structure
*/
struct ns2_pin {
unsigned int pin;
char *name;
struct ns2_pinconf pin_conf;
};
#define NS2_PIN_DESC(p, n, b, o, s, i, pu, d) \
{ \
.pin = p, \
.name = n, \
.pin_conf = { \
.base = b, \
.offset = o, \
.src_shift = s, \
.input_en = i, \
.pull_shift = pu, \
.drive_shift = d, \
} \
}
/*
* List of pins in Northstar2
*/
static struct ns2_pin ns2_pins[] = {
NS2_PIN_DESC(0, "mfio_0", -1, 0, 0, 0, 0, 0),
NS2_PIN_DESC(1, "mfio_1", -1, 0, 0, 0, 0, 0),
NS2_PIN_DESC(2, "mfio_2", -1, 0, 0, 0, 0, 0),
NS2_PIN_DESC(3, "mfio_3", -1, 0, 0, 0, 0, 0),
NS2_PIN_DESC(4, "mfio_4", -1, 0, 0, 0, 0, 0),
NS2_PIN_DESC(5, "mfio_5", -1, 0, 0, 0, 0, 0),
NS2_PIN_DESC(6, "mfio_6", -1, 0, 0, 0, 0, 0),
NS2_PIN_DESC(7, "mfio_7", -1, 0, 0, 0, 0, 0),
NS2_PIN_DESC(8, "mfio_8", -1, 0, 0, 0, 0, 0),
NS2_PIN_DESC(9, "mfio_9", -1, 0, 0, 0, 0, 0),
NS2_PIN_DESC(10, "mfio_10", -1, 0, 0, 0, 0, 0),
NS2_PIN_DESC(11, "mfio_11", -1, 0, 0, 0, 0, 0),
NS2_PIN_DESC(12, "mfio_12", -1, 0, 0, 0, 0, 0),
NS2_PIN_DESC(13, "mfio_13", -1, 0, 0, 0, 0, 0),
NS2_PIN_DESC(14, "mfio_14", -1, 0, 0, 0, 0, 0),
NS2_PIN_DESC(15, "mfio_15", -1, 0, 0, 0, 0, 0),
NS2_PIN_DESC(16, "mfio_16", -1, 0, 0, 0, 0, 0),
NS2_PIN_DESC(17, "mfio_17", -1, 0, 0, 0, 0, 0),
NS2_PIN_DESC(18, "mfio_18", -1, 0, 0, 0, 0, 0),
NS2_PIN_DESC(19, "mfio_19", -1, 0, 0, 0, 0, 0),
NS2_PIN_DESC(20, "mfio_20", -1, 0, 0, 0, 0, 0),
NS2_PIN_DESC(21, "mfio_21", -1, 0, 0, 0, 0, 0),
NS2_PIN_DESC(22, "mfio_22", -1, 0, 0, 0, 0, 0),
NS2_PIN_DESC(23, "mfio_23", -1, 0, 0, 0, 0, 0),
NS2_PIN_DESC(24, "mfio_24", -1, 0, 0, 0, 0, 0),
NS2_PIN_DESC(25, "mfio_25", -1, 0, 0, 0, 0, 0),
NS2_PIN_DESC(26, "mfio_26", -1, 0, 0, 0, 0, 0),
NS2_PIN_DESC(27, "mfio_27", -1, 0, 0, 0, 0, 0),
NS2_PIN_DESC(28, "mfio_28", -1, 0, 0, 0, 0, 0),
NS2_PIN_DESC(29, "mfio_29", -1, 0, 0, 0, 0, 0),
NS2_PIN_DESC(30, "mfio_30", -1, 0, 0, 0, 0, 0),
NS2_PIN_DESC(31, "mfio_31", -1, 0, 0, 0, 0, 0),
NS2_PIN_DESC(32, "mfio_32", -1, 0, 0, 0, 0, 0),
NS2_PIN_DESC(33, "mfio_33", -1, 0, 0, 0, 0, 0),
NS2_PIN_DESC(34, "mfio_34", -1, 0, 0, 0, 0, 0),
NS2_PIN_DESC(35, "mfio_35", -1, 0, 0, 0, 0, 0),
NS2_PIN_DESC(36, "mfio_36", -1, 0, 0, 0, 0, 0),
NS2_PIN_DESC(37, "mfio_37", -1, 0, 0, 0, 0, 0),
NS2_PIN_DESC(38, "mfio_38", -1, 0, 0, 0, 0, 0),
NS2_PIN_DESC(39, "mfio_39", -1, 0, 0, 0, 0, 0),
NS2_PIN_DESC(40, "mfio_40", -1, 0, 0, 0, 0, 0),
NS2_PIN_DESC(41, "mfio_41", -1, 0, 0, 0, 0, 0),
NS2_PIN_DESC(42, "mfio_42", -1, 0, 0, 0, 0, 0),
NS2_PIN_DESC(43, "mfio_43", -1, 0, 0, 0, 0, 0),
NS2_PIN_DESC(44, "mfio_44", -1, 0, 0, 0, 0, 0),
NS2_PIN_DESC(45, "mfio_45", -1, 0, 0, 0, 0, 0),
NS2_PIN_DESC(46, "mfio_46", -1, 0, 0, 0, 0, 0),
NS2_PIN_DESC(47, "mfio_47", -1, 0, 0, 0, 0, 0),
NS2_PIN_DESC(48, "mfio_48", -1, 0, 0, 0, 0, 0),
NS2_PIN_DESC(49, "mfio_49", -1, 0, 0, 0, 0, 0),
NS2_PIN_DESC(50, "mfio_50", -1, 0, 0, 0, 0, 0),
NS2_PIN_DESC(51, "mfio_51", -1, 0, 0, 0, 0, 0),
NS2_PIN_DESC(52, "mfio_52", -1, 0, 0, 0, 0, 0),
NS2_PIN_DESC(53, "mfio_53", -1, 0, 0, 0, 0, 0),
NS2_PIN_DESC(54, "mfio_54", -1, 0, 0, 0, 0, 0),
NS2_PIN_DESC(55, "mfio_55", -1, 0, 0, 0, 0, 0),
NS2_PIN_DESC(56, "mfio_56", -1, 0, 0, 0, 0, 0),
NS2_PIN_DESC(57, "mfio_57", -1, 0, 0, 0, 0, 0),
NS2_PIN_DESC(58, "mfio_58", -1, 0, 0, 0, 0, 0),
NS2_PIN_DESC(59, "mfio_59", -1, 0, 0, 0, 0, 0),
NS2_PIN_DESC(60, "mfio_60", -1, 0, 0, 0, 0, 0),
NS2_PIN_DESC(61, "mfio_61", -1, 0, 0, 0, 0, 0),
NS2_PIN_DESC(62, "mfio_62", -1, 0, 0, 0, 0, 0),
NS2_PIN_DESC(63, "qspi_wp", 2, 0x0, 31, 30, 27, 24),
NS2_PIN_DESC(64, "qspi_hold", 2, 0x0, 23, 22, 19, 16),
NS2_PIN_DESC(65, "qspi_cs", 2, 0x0, 15, 14, 11, 8),
NS2_PIN_DESC(66, "qspi_sck", 2, 0x0, 7, 6, 3, 0),
NS2_PIN_DESC(67, "uart3_sin", 2, 0x04, 31, 30, 27, 24),
NS2_PIN_DESC(68, "uart3_sout", 2, 0x04, 23, 22, 19, 16),
NS2_PIN_DESC(69, "qspi_mosi", 2, 0x04, 15, 14, 11, 8),
NS2_PIN_DESC(70, "qspi_miso", 2, 0x04, 7, 6, 3, 0),
NS2_PIN_DESC(71, "spi0_fss", 2, 0x08, 31, 30, 27, 24),
NS2_PIN_DESC(72, "spi0_rxd", 2, 0x08, 23, 22, 19, 16),
NS2_PIN_DESC(73, "spi0_txd", 2, 0x08, 15, 14, 11, 8),
NS2_PIN_DESC(74, "spi0_sck", 2, 0x08, 7, 6, 3, 0),
NS2_PIN_DESC(75, "spi1_fss", 2, 0x0c, 31, 30, 27, 24),
NS2_PIN_DESC(76, "spi1_rxd", 2, 0x0c, 23, 22, 19, 16),
NS2_PIN_DESC(77, "spi1_txd", 2, 0x0c, 15, 14, 11, 8),
NS2_PIN_DESC(78, "spi1_sck", 2, 0x0c, 7, 6, 3, 0),
NS2_PIN_DESC(79, "sdio0_data7", 2, 0x10, 31, 30, 27, 24),
NS2_PIN_DESC(80, "sdio0_emmc_rst", 2, 0x10, 23, 22, 19, 16),
NS2_PIN_DESC(81, "sdio0_led_on", 2, 0x10, 15, 14, 11, 8),
NS2_PIN_DESC(82, "sdio0_wp", 2, 0x10, 7, 6, 3, 0),
NS2_PIN_DESC(83, "sdio0_data3", 2, 0x14, 31, 30, 27, 24),
NS2_PIN_DESC(84, "sdio0_data4", 2, 0x14, 23, 22, 19, 16),
NS2_PIN_DESC(85, "sdio0_data5", 2, 0x14, 15, 14, 11, 8),
NS2_PIN_DESC(86, "sdio0_data6", 2, 0x14, 7, 6, 3, 0),
NS2_PIN_DESC(87, "sdio0_cmd", 2, 0x18, 31, 30, 27, 24),
NS2_PIN_DESC(88, "sdio0_data0", 2, 0x18, 23, 22, 19, 16),
NS2_PIN_DESC(89, "sdio0_data1", 2, 0x18, 15, 14, 11, 8),
NS2_PIN_DESC(90, "sdio0_data2", 2, 0x18, 7, 6, 3, 0),
NS2_PIN_DESC(91, "sdio1_led_on", 2, 0x1c, 31, 30, 27, 24),
NS2_PIN_DESC(92, "sdio1_wp", 2, 0x1c, 23, 22, 19, 16),
NS2_PIN_DESC(93, "sdio0_cd_l", 2, 0x1c, 15, 14, 11, 8),
NS2_PIN_DESC(94, "sdio0_clk", 2, 0x1c, 7, 6, 3, 0),
NS2_PIN_DESC(95, "sdio1_data5", 2, 0x20, 31, 30, 27, 24),
NS2_PIN_DESC(96, "sdio1_data6", 2, 0x20, 23, 22, 19, 16),
NS2_PIN_DESC(97, "sdio1_data7", 2, 0x20, 15, 14, 11, 8),
NS2_PIN_DESC(98, "sdio1_emmc_rst", 2, 0x20, 7, 6, 3, 0),
NS2_PIN_DESC(99, "sdio1_data1", 2, 0x24, 31, 30, 27, 24),
NS2_PIN_DESC(100, "sdio1_data2", 2, 0x24, 23, 22, 19, 16),
NS2_PIN_DESC(101, "sdio1_data3", 2, 0x24, 15, 14, 11, 8),
NS2_PIN_DESC(102, "sdio1_data4", 2, 0x24, 7, 6, 3, 0),
NS2_PIN_DESC(103, "sdio1_cd_l", 2, 0x28, 31, 30, 27, 24),
NS2_PIN_DESC(104, "sdio1_clk", 2, 0x28, 23, 22, 19, 16),
NS2_PIN_DESC(105, "sdio1_cmd", 2, 0x28, 15, 14, 11, 8),
NS2_PIN_DESC(106, "sdio1_data0", 2, 0x28, 7, 6, 3, 0),
NS2_PIN_DESC(107, "ext_mdio_0", 2, 0x2c, 15, 14, 11, 8),
NS2_PIN_DESC(108, "ext_mdc_0", 2, 0x2c, 7, 6, 3, 0),
NS2_PIN_DESC(109, "usb3_p1_vbus_ppc", 2, 0x34, 31, 30, 27, 24),
NS2_PIN_DESC(110, "usb3_p1_overcurrent", 2, 0x34, 23, 22, 19, 16),
NS2_PIN_DESC(111, "usb3_p0_vbus_ppc", 2, 0x34, 15, 14, 11, 8),
NS2_PIN_DESC(112, "usb3_p0_overcurrent", 2, 0x34, 7, 6, 3, 0),
NS2_PIN_DESC(113, "usb2_presence_indication", 2, 0x38, 31, 30, 27, 24),
NS2_PIN_DESC(114, "usb2_vbus_present", 2, 0x38, 23, 22, 19, 16),
NS2_PIN_DESC(115, "usb2_vbus_ppc", 2, 0x38, 15, 14, 11, 8),
NS2_PIN_DESC(116, "usb2_overcurrent", 2, 0x38, 7, 6, 3, 0),
NS2_PIN_DESC(117, "sata_led1", 2, 0x3c, 15, 14, 11, 8),
NS2_PIN_DESC(118, "sata_led0", 2, 0x3c, 7, 6, 3, 0),
};
/*
* List of groups of pins
*/
static const unsigned int nand_pins[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10,
11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23};
static const unsigned int nor_data_pins[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25};
static const unsigned int gpio_0_1_pins[] = {24, 25};
static const unsigned int pwm_0_pins[] = {24};
static const unsigned int pwm_1_pins[] = {25};
static const unsigned int uart1_ext_clk_pins[] = {26};
static const unsigned int nor_adv_pins[] = {26};
static const unsigned int gpio_2_5_pins[] = {27, 28, 29, 30};
static const unsigned int pcie_ab1_clk_wak_pins[] = {27, 28, 29, 30};
static const unsigned int nor_addr_0_3_pins[] = {27, 28, 29, 30};
static const unsigned int pwm_2_pins[] = {27};
static const unsigned int pwm_3_pins[] = {28};
static const unsigned int gpio_6_7_pins[] = {31, 32};
static const unsigned int pcie_a3_clk_wak_pins[] = {31, 32};
static const unsigned int nor_addr_4_5_pins[] = {31, 32};
static const unsigned int gpio_8_9_pins[] = {33, 34};
static const unsigned int pcie_b3_clk_wak_pins[] = {33, 34};
static const unsigned int nor_addr_6_7_pins[] = {33, 34};
static const unsigned int gpio_10_11_pins[] = {35, 36};
static const unsigned int pcie_b2_clk_wak_pins[] = {35, 36};
static const unsigned int nor_addr_8_9_pins[] = {35, 36};
static const unsigned int gpio_12_13_pins[] = {37, 38};
static const unsigned int pcie_a2_clk_wak_pins[] = {37, 38};
static const unsigned int nor_addr_10_11_pins[] = {37, 38};
static const unsigned int gpio_14_17_pins[] = {39, 40, 41, 42};
static const unsigned int uart0_modem_pins[] = {39, 40, 41, 42};
static const unsigned int nor_addr_12_15_pins[] = {39, 40, 41, 42};
static const unsigned int gpio_18_19_pins[] = {43, 44};
static const unsigned int uart0_rts_cts_pins[] = {43, 44};
static const unsigned int gpio_20_21_pins[] = {45, 46};
static const unsigned int uart0_in_out_pins[] = {45, 46};
static const unsigned int gpio_22_23_pins[] = {47, 48};
static const unsigned int uart1_dcd_dsr_pins[] = {47, 48};
static const unsigned int gpio_24_25_pins[] = {49, 50};
static const unsigned int uart1_ri_dtr_pins[] = {49, 50};
static const unsigned int gpio_26_27_pins[] = {51, 52};
static const unsigned int uart1_rts_cts_pins[] = {51, 52};
static const unsigned int gpio_28_29_pins[] = {53, 54};
static const unsigned int uart1_in_out_pins[] = {53, 54};
static const unsigned int gpio_30_31_pins[] = {55, 56};
static const unsigned int uart2_rts_cts_pins[] = {55, 56};
#define NS2_PIN_GROUP(group_name, ba, off, sh, ma, al) \
{ \
.name = __stringify(group_name) "_grp", \
.pins = group_name ## _pins, \
.num_pins = ARRAY_SIZE(group_name ## _pins), \
.mux = { \
.base = ba, \
.offset = off, \
.shift = sh, \
.mask = ma, \
.alt = al, \
} \
}
/*
* List of Northstar2 pin groups
*/
static const struct ns2_pin_group ns2_pin_groups[] = {
NS2_PIN_GROUP(nand, 0, 0, 31, 1, 0),
NS2_PIN_GROUP(nor_data, 0, 0, 31, 1, 1),
NS2_PIN_GROUP(gpio_0_1, 0, 0, 31, 1, 0),
NS2_PIN_GROUP(uart1_ext_clk, 0, 4, 30, 3, 1),
NS2_PIN_GROUP(nor_adv, 0, 4, 30, 3, 2),
NS2_PIN_GROUP(gpio_2_5, 0, 4, 28, 3, 0),
NS2_PIN_GROUP(pcie_ab1_clk_wak, 0, 4, 28, 3, 1),
NS2_PIN_GROUP(nor_addr_0_3, 0, 4, 28, 3, 2),
NS2_PIN_GROUP(gpio_6_7, 0, 4, 26, 3, 0),
NS2_PIN_GROUP(pcie_a3_clk_wak, 0, 4, 26, 3, 1),
NS2_PIN_GROUP(nor_addr_4_5, 0, 4, 26, 3, 2),
NS2_PIN_GROUP(gpio_8_9, 0, 4, 24, 3, 0),
NS2_PIN_GROUP(pcie_b3_clk_wak, 0, 4, 24, 3, 1),
NS2_PIN_GROUP(nor_addr_6_7, 0, 4, 24, 3, 2),
NS2_PIN_GROUP(gpio_10_11, 0, 4, 22, 3, 0),
NS2_PIN_GROUP(pcie_b2_clk_wak, 0, 4, 22, 3, 1),
NS2_PIN_GROUP(nor_addr_8_9, 0, 4, 22, 3, 2),
NS2_PIN_GROUP(gpio_12_13, 0, 4, 20, 3, 0),
NS2_PIN_GROUP(pcie_a2_clk_wak, 0, 4, 20, 3, 1),
NS2_PIN_GROUP(nor_addr_10_11, 0, 4, 20, 3, 2),
NS2_PIN_GROUP(gpio_14_17, 0, 4, 18, 3, 0),
NS2_PIN_GROUP(uart0_modem, 0, 4, 18, 3, 1),
NS2_PIN_GROUP(nor_addr_12_15, 0, 4, 18, 3, 2),
NS2_PIN_GROUP(gpio_18_19, 0, 4, 16, 3, 0),
NS2_PIN_GROUP(uart0_rts_cts, 0, 4, 16, 3, 1),
NS2_PIN_GROUP(gpio_20_21, 0, 4, 14, 3, 0),
NS2_PIN_GROUP(uart0_in_out, 0, 4, 14, 3, 1),
NS2_PIN_GROUP(gpio_22_23, 0, 4, 12, 3, 0),
NS2_PIN_GROUP(uart1_dcd_dsr, 0, 4, 12, 3, 1),
NS2_PIN_GROUP(gpio_24_25, 0, 4, 10, 3, 0),
NS2_PIN_GROUP(uart1_ri_dtr, 0, 4, 10, 3, 1),
NS2_PIN_GROUP(gpio_26_27, 0, 4, 8, 3, 0),
NS2_PIN_GROUP(uart1_rts_cts, 0, 4, 8, 3, 1),
NS2_PIN_GROUP(gpio_28_29, 0, 4, 6, 3, 0),
NS2_PIN_GROUP(uart1_in_out, 0, 4, 6, 3, 1),
NS2_PIN_GROUP(gpio_30_31, 0, 4, 4, 3, 0),
NS2_PIN_GROUP(uart2_rts_cts, 0, 4, 4, 3, 1),
NS2_PIN_GROUP(pwm_0, 1, 0, 0, 1, 1),
NS2_PIN_GROUP(pwm_1, 1, 0, 1, 1, 1),
NS2_PIN_GROUP(pwm_2, 1, 0, 2, 1, 1),
NS2_PIN_GROUP(pwm_3, 1, 0, 3, 1, 1),
};
/*
* List of groups supported by functions
*/
static const char * const nand_grps[] = {"nand_grp"};
static const char * const nor_grps[] = {"nor_data_grp", "nor_adv_grp",
"nor_addr_0_3_grp", "nor_addr_4_5_grp", "nor_addr_6_7_grp",
"nor_addr_8_9_grp", "nor_addr_10_11_grp", "nor_addr_12_15_grp"};
static const char * const gpio_grps[] = {"gpio_0_1_grp", "gpio_2_5_grp",
"gpio_6_7_grp", "gpio_8_9_grp", "gpio_10_11_grp", "gpio_12_13_grp",
"gpio_14_17_grp", "gpio_18_19_grp", "gpio_20_21_grp", "gpio_22_23_grp",
"gpio_24_25_grp", "gpio_26_27_grp", "gpio_28_29_grp",
"gpio_30_31_grp"};
static const char * const pcie_grps[] = {"pcie_ab1_clk_wak_grp",
"pcie_a3_clk_wak_grp", "pcie_b3_clk_wak_grp", "pcie_b2_clk_wak_grp",
"pcie_a2_clk_wak_grp"};
static const char * const uart0_grps[] = {"uart0_modem_grp",
"uart0_rts_cts_grp", "uart0_in_out_grp"};
static const char * const uart1_grps[] = {"uart1_ext_clk_grp",
"uart1_dcd_dsr_grp", "uart1_ri_dtr_grp", "uart1_rts_cts_grp",
"uart1_in_out_grp"};
static const char * const uart2_grps[] = {"uart2_rts_cts_grp"};
static const char * const pwm_grps[] = {"pwm_0_grp", "pwm_1_grp",
"pwm_2_grp", "pwm_3_grp"};
#define NS2_PIN_FUNCTION(func) \
{ \
.name = #func, \
.groups = func ## _grps, \
.num_groups = ARRAY_SIZE(func ## _grps), \
}
/*
* List of supported functions
*/
static const struct ns2_pin_function ns2_pin_functions[] = {
NS2_PIN_FUNCTION(nand),
NS2_PIN_FUNCTION(nor),
NS2_PIN_FUNCTION(gpio),
NS2_PIN_FUNCTION(pcie),
NS2_PIN_FUNCTION(uart0),
NS2_PIN_FUNCTION(uart1),
NS2_PIN_FUNCTION(uart2),
NS2_PIN_FUNCTION(pwm),
};
static int ns2_get_groups_count(struct pinctrl_dev *pctrl_dev)
{
struct ns2_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
return pinctrl->num_groups;
}
static const char *ns2_get_group_name(struct pinctrl_dev *pctrl_dev,
unsigned int selector)
{
struct ns2_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
return pinctrl->groups[selector].name;
}
static int ns2_get_group_pins(struct pinctrl_dev *pctrl_dev,
unsigned int selector, const unsigned int **pins,
unsigned int *num_pins)
{
struct ns2_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
*pins = pinctrl->groups[selector].pins;
*num_pins = pinctrl->groups[selector].num_pins;
return 0;
}
static void ns2_pin_dbg_show(struct pinctrl_dev *pctrl_dev,
struct seq_file *s, unsigned int offset)
{
seq_printf(s, " %s", dev_name(pctrl_dev->dev));
}
static const struct pinctrl_ops ns2_pinctrl_ops = {
.get_groups_count = ns2_get_groups_count,
.get_group_name = ns2_get_group_name,
.get_group_pins = ns2_get_group_pins,
.pin_dbg_show = ns2_pin_dbg_show,
.dt_node_to_map = pinconf_generic_dt_node_to_map_pin,
.dt_free_map = pinctrl_utils_free_map,
};
static int ns2_get_functions_count(struct pinctrl_dev *pctrl_dev)
{
struct ns2_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
return pinctrl->num_functions;
}
static const char *ns2_get_function_name(struct pinctrl_dev *pctrl_dev,
unsigned int selector)
{
struct ns2_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
return pinctrl->functions[selector].name;
}
static int ns2_get_function_groups(struct pinctrl_dev *pctrl_dev,
unsigned int selector,
const char * const **groups,
unsigned int * const num_groups)
{
struct ns2_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
*groups = pinctrl->functions[selector].groups;
*num_groups = pinctrl->functions[selector].num_groups;
return 0;
}
static int ns2_pinmux_set(struct ns2_pinctrl *pinctrl,
const struct ns2_pin_function *func,
const struct ns2_pin_group *grp,
struct ns2_mux_log *mux_log)
{
const struct ns2_mux *mux = &grp->mux;
int i;
u32 val, mask;
unsigned long flags;
void __iomem *base_address;
for (i = 0; i < NS2_NUM_IOMUX; i++) {
if ((mux->shift != mux_log[i].mux.shift) ||
(mux->base != mux_log[i].mux.base) ||
(mux->offset != mux_log[i].mux.offset))
continue;
/* if this is a new configuration, just do it! */
if (!mux_log[i].is_configured)
break;
/*
* IOMUX has been configured previously and one is trying to
* configure it to a different function
*/
if (mux_log[i].mux.alt != mux->alt) {
dev_err(pinctrl->dev,
"double configuration error detected!\n");
dev_err(pinctrl->dev, "func:%s grp:%s\n",
func->name, grp->name);
return -EINVAL;
}
return 0;
}
if (i == NS2_NUM_IOMUX)
return -EINVAL;
mask = mux->mask;
mux_log[i].mux.alt = mux->alt;
mux_log[i].is_configured = true;
switch (mux->base) {
case NS2_PIN_MUX_BASE0:
base_address = pinctrl->base0;
break;
case NS2_PIN_MUX_BASE1:
base_address = pinctrl->base1;
break;
default:
return -EINVAL;
}
spin_lock_irqsave(&pinctrl->lock, flags);
val = readl(base_address + grp->mux.offset);
val &= ~(mask << grp->mux.shift);
val |= grp->mux.alt << grp->mux.shift;
writel(val, (base_address + grp->mux.offset));
spin_unlock_irqrestore(&pinctrl->lock, flags);
return 0;
}
static int ns2_pinmux_enable(struct pinctrl_dev *pctrl_dev,
unsigned int func_select, unsigned int grp_select)
{
struct ns2_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
const struct ns2_pin_function *func;
const struct ns2_pin_group *grp;
if (grp_select > pinctrl->num_groups ||
func_select > pinctrl->num_functions)
return -EINVAL;
func = &pinctrl->functions[func_select];
grp = &pinctrl->groups[grp_select];
dev_dbg(pctrl_dev->dev, "func:%u name:%s grp:%u name:%s\n",
func_select, func->name, grp_select, grp->name);
dev_dbg(pctrl_dev->dev, "offset:0x%08x shift:%u alt:%u\n",
grp->mux.offset, grp->mux.shift, grp->mux.alt);
return ns2_pinmux_set(pinctrl, func, grp, pinctrl->mux_log);
}
static int ns2_pin_set_enable(struct pinctrl_dev *pctrldev, unsigned int pin,
u16 enable)
{
struct ns2_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrldev);
struct ns2_pin *pin_data = pctrldev->desc->pins[pin].drv_data;
unsigned long flags;
u32 val;
void __iomem *base_address;
base_address = pinctrl->pinconf_base;
spin_lock_irqsave(&pinctrl->lock, flags);
val = readl(base_address + pin_data->pin_conf.offset);
val &= ~(NS2_PIN_SRC_MASK << pin_data->pin_conf.input_en);
if (!enable)
val |= NS2_PIN_INPUT_EN_MASK << pin_data->pin_conf.input_en;
writel(val, (base_address + pin_data->pin_conf.offset));
spin_unlock_irqrestore(&pinctrl->lock, flags);
dev_dbg(pctrldev->dev, "pin:%u set enable:%d\n", pin, enable);
return 0;
}
static int ns2_pin_get_enable(struct pinctrl_dev *pctrldev, unsigned int pin)
{
struct ns2_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrldev);
struct ns2_pin *pin_data = pctrldev->desc->pins[pin].drv_data;
unsigned long flags;
int enable;
spin_lock_irqsave(&pinctrl->lock, flags);
enable = readl(pinctrl->pinconf_base + pin_data->pin_conf.offset);
enable = (enable >> pin_data->pin_conf.input_en) &
NS2_PIN_INPUT_EN_MASK;
spin_unlock_irqrestore(&pinctrl->lock, flags);
if (!enable)
enable = NS2_PIN_INPUT_EN_MASK;
else
enable = 0;
dev_dbg(pctrldev->dev, "pin:%u get disable:%d\n", pin, enable);
return enable;
}
static int ns2_pin_set_slew(struct pinctrl_dev *pctrldev, unsigned int pin,
u32 slew)
{
struct ns2_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrldev);
struct ns2_pin *pin_data = pctrldev->desc->pins[pin].drv_data;
unsigned long flags;
u32 val;
void __iomem *base_address;
base_address = pinctrl->pinconf_base;
spin_lock_irqsave(&pinctrl->lock, flags);
val = readl(base_address + pin_data->pin_conf.offset);
val &= ~(NS2_PIN_SRC_MASK << pin_data->pin_conf.src_shift);
if (slew)
val |= NS2_PIN_SRC_MASK << pin_data->pin_conf.src_shift;
writel(val, (base_address + pin_data->pin_conf.offset));
spin_unlock_irqrestore(&pinctrl->lock, flags);
dev_dbg(pctrldev->dev, "pin:%u set slew:%d\n", pin, slew);
return 0;
}
static int ns2_pin_get_slew(struct pinctrl_dev *pctrldev, unsigned int pin,
u16 *slew)
{
struct ns2_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrldev);
struct ns2_pin *pin_data = pctrldev->desc->pins[pin].drv_data;
unsigned long flags;
u32 val;
spin_lock_irqsave(&pinctrl->lock, flags);
val = readl(pinctrl->pinconf_base + pin_data->pin_conf.offset);
*slew = (val >> pin_data->pin_conf.src_shift) & NS2_PIN_SRC_MASK;
spin_unlock_irqrestore(&pinctrl->lock, flags);
dev_dbg(pctrldev->dev, "pin:%u get slew:%d\n", pin, *slew);
return 0;
}
static int ns2_pin_set_pull(struct pinctrl_dev *pctrldev, unsigned int pin,
bool pull_up, bool pull_down)
{
struct ns2_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrldev);
struct ns2_pin *pin_data = pctrldev->desc->pins[pin].drv_data;
unsigned long flags;
u32 val;
void __iomem *base_address;
base_address = pinctrl->pinconf_base;
spin_lock_irqsave(&pinctrl->lock, flags);
val = readl(base_address + pin_data->pin_conf.offset);
val &= ~(NS2_PIN_PULL_MASK << pin_data->pin_conf.pull_shift);
if (pull_up == true)
val |= NS2_PIN_PULL_UP << pin_data->pin_conf.pull_shift;
if (pull_down == true)
val |= NS2_PIN_PULL_DOWN << pin_data->pin_conf.pull_shift;
writel(val, (base_address + pin_data->pin_conf.offset));
spin_unlock_irqrestore(&pinctrl->lock, flags);
dev_dbg(pctrldev->dev, "pin:%u set pullup:%d pulldown: %d\n",
pin, pull_up, pull_down);
return 0;
}
static void ns2_pin_get_pull(struct pinctrl_dev *pctrldev,
unsigned int pin, bool *pull_up,
bool *pull_down)
{
struct ns2_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrldev);
struct ns2_pin *pin_data = pctrldev->desc->pins[pin].drv_data;
unsigned long flags;
u32 val;
spin_lock_irqsave(&pinctrl->lock, flags);
val = readl(pinctrl->pinconf_base + pin_data->pin_conf.offset);
val = (val >> pin_data->pin_conf.pull_shift) & NS2_PIN_PULL_MASK;
*pull_up = false;
*pull_down = false;
if (val == NS2_PIN_PULL_UP)
*pull_up = true;
if (val == NS2_PIN_PULL_DOWN)
*pull_down = true;
spin_unlock_irqrestore(&pinctrl->lock, flags);
}
static int ns2_pin_set_strength(struct pinctrl_dev *pctrldev, unsigned int pin,
u32 strength)
{
struct ns2_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrldev);
struct ns2_pin *pin_data = pctrldev->desc->pins[pin].drv_data;
u32 val;
unsigned long flags;
void __iomem *base_address;
/* make sure drive strength is supported */
if (strength < 2 || strength > 16 || (strength % 2))
return -ENOTSUPP;
base_address = pinctrl->pinconf_base;
spin_lock_irqsave(&pinctrl->lock, flags);
val = readl(base_address + pin_data->pin_conf.offset);
val &= ~(NS2_PIN_DRIVE_STRENGTH_MASK << pin_data->pin_conf.drive_shift);
val |= ((strength / 2) - 1) << pin_data->pin_conf.drive_shift;
writel(val, (base_address + pin_data->pin_conf.offset));
spin_unlock_irqrestore(&pinctrl->lock, flags);
dev_dbg(pctrldev->dev, "pin:%u set drive strength:%d mA\n",
pin, strength);
return 0;
}
static int ns2_pin_get_strength(struct pinctrl_dev *pctrldev, unsigned int pin,
u16 *strength)
{
struct ns2_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrldev);
struct ns2_pin *pin_data = pctrldev->desc->pins[pin].drv_data;
u32 val;
unsigned long flags;
spin_lock_irqsave(&pinctrl->lock, flags);
val = readl(pinctrl->pinconf_base + pin_data->pin_conf.offset);
*strength = (val >> pin_data->pin_conf.drive_shift) &
NS2_PIN_DRIVE_STRENGTH_MASK;
*strength = (*strength + 1) * 2;
spin_unlock_irqrestore(&pinctrl->lock, flags);
dev_dbg(pctrldev->dev, "pin:%u get drive strength:%d mA\n",
pin, *strength);
return 0;
}
static int ns2_pin_config_get(struct pinctrl_dev *pctldev, unsigned int pin,
unsigned long *config)
{
struct ns2_pin *pin_data = pctldev->desc->pins[pin].drv_data;
enum pin_config_param param = pinconf_to_config_param(*config);
bool pull_up, pull_down;
u16 arg = 0;
int ret;
if (pin_data->pin_conf.base == -1)
return -ENOTSUPP;
switch (param) {
case PIN_CONFIG_BIAS_DISABLE:
ns2_pin_get_pull(pctldev, pin, &pull_up, &pull_down);
if ((pull_up == false) && (pull_down == false))
return 0;
else
return -EINVAL;
case PIN_CONFIG_BIAS_PULL_UP:
ns2_pin_get_pull(pctldev, pin, &pull_up, &pull_down);
if (pull_up)
return 0;
else
return -EINVAL;
case PIN_CONFIG_BIAS_PULL_DOWN:
ns2_pin_get_pull(pctldev, pin, &pull_up, &pull_down);
if (pull_down)
return 0;
else
return -EINVAL;
case PIN_CONFIG_DRIVE_STRENGTH:
ret = ns2_pin_get_strength(pctldev, pin, &arg);
if (ret)
return ret;
*config = pinconf_to_config_packed(param, arg);
return 0;
case PIN_CONFIG_SLEW_RATE:
ret = ns2_pin_get_slew(pctldev, pin, &arg);
if (ret)
return ret;
*config = pinconf_to_config_packed(param, arg);
return 0;
case PIN_CONFIG_INPUT_ENABLE:
ret = ns2_pin_get_enable(pctldev, pin);
if (ret)
return 0;
else
return -EINVAL;
default:
return -ENOTSUPP;
}
}
static int ns2_pin_config_set(struct pinctrl_dev *pctrldev, unsigned int pin,
unsigned long *configs, unsigned int num_configs)
{
struct ns2_pin *pin_data = pctrldev->desc->pins[pin].drv_data;
enum pin_config_param param;
unsigned int i;
u32 arg;
int ret = -ENOTSUPP;
if (pin_data->pin_conf.base == -1)
return -ENOTSUPP;
for (i = 0; i < num_configs; i++) {
param = pinconf_to_config_param(configs[i]);
arg = pinconf_to_config_argument(configs[i]);
switch (param) {
case PIN_CONFIG_BIAS_DISABLE:
ret = ns2_pin_set_pull(pctrldev, pin, false, false);
if (ret < 0)
goto out;
break;
case PIN_CONFIG_BIAS_PULL_UP:
ret = ns2_pin_set_pull(pctrldev, pin, true, false);
if (ret < 0)
goto out;
break;
case PIN_CONFIG_BIAS_PULL_DOWN:
ret = ns2_pin_set_pull(pctrldev, pin, false, true);
if (ret < 0)
goto out;
break;
case PIN_CONFIG_DRIVE_STRENGTH:
ret = ns2_pin_set_strength(pctrldev, pin, arg);
if (ret < 0)
goto out;
break;
case PIN_CONFIG_SLEW_RATE:
ret = ns2_pin_set_slew(pctrldev, pin, arg);
if (ret < 0)
goto out;
break;
case PIN_CONFIG_INPUT_ENABLE:
ret = ns2_pin_set_enable(pctrldev, pin, arg);
if (ret < 0)
goto out;
break;
default:
dev_err(pctrldev->dev, "invalid configuration\n");
return -ENOTSUPP;
}
}
out:
return ret;
}
static const struct pinmux_ops ns2_pinmux_ops = {
.get_functions_count = ns2_get_functions_count,
.get_function_name = ns2_get_function_name,
.get_function_groups = ns2_get_function_groups,
.set_mux = ns2_pinmux_enable,
};
static const struct pinconf_ops ns2_pinconf_ops = {
.is_generic = true,
.pin_config_get = ns2_pin_config_get,
.pin_config_set = ns2_pin_config_set,
};
static struct pinctrl_desc ns2_pinctrl_desc = {
.name = "ns2-pinmux",
.pctlops = &ns2_pinctrl_ops,
.pmxops = &ns2_pinmux_ops,
.confops = &ns2_pinconf_ops,
};
static int ns2_mux_log_init(struct ns2_pinctrl *pinctrl)
{
struct ns2_mux_log *log;
unsigned int i;
pinctrl->mux_log = devm_kcalloc(pinctrl->dev, NS2_NUM_IOMUX,
sizeof(struct ns2_mux_log),
GFP_KERNEL);
if (!pinctrl->mux_log)
return -ENOMEM;
for (i = 0; i < NS2_NUM_IOMUX; i++)
pinctrl->mux_log[i].is_configured = false;
/* Group 0 uses bit 31 in the IOMUX_PAD_FUNCTION_0 register */
log = &pinctrl->mux_log[0];
log->mux.base = NS2_PIN_MUX_BASE0;
log->mux.offset = 0;
log->mux.shift = 31;
log->mux.alt = 0;
/*
* Groups 1 through 14 use two bits each in the
* IOMUX_PAD_FUNCTION_1 register starting with
* bit position 30.
*/
for (i = 1; i < (NS2_NUM_IOMUX - NS2_NUM_PWM_MUX); i++) {
log = &pinctrl->mux_log[i];
log->mux.base = NS2_PIN_MUX_BASE0;
log->mux.offset = NS2_MUX_PAD_FUNC1_OFFSET;
log->mux.shift = 32 - (i * 2);
log->mux.alt = 0;
}
/*
* Groups 15 through 18 use one bit each in the
* AUX_SEL register.
*/
for (i = 0; i < NS2_NUM_PWM_MUX; i++) {
log = &pinctrl->mux_log[(NS2_NUM_IOMUX - NS2_NUM_PWM_MUX) + i];
log->mux.base = NS2_PIN_MUX_BASE1;
log->mux.offset = 0;
log->mux.shift = i;
log->mux.alt = 0;
}
return 0;
}
static int ns2_pinmux_probe(struct platform_device *pdev)
{
struct ns2_pinctrl *pinctrl;
struct resource *res;
int i, ret;
struct pinctrl_pin_desc *pins;
unsigned int num_pins = ARRAY_SIZE(ns2_pins);
pinctrl = devm_kzalloc(&pdev->dev, sizeof(*pinctrl), GFP_KERNEL);
if (!pinctrl)
return -ENOMEM;
pinctrl->dev = &pdev->dev;
platform_set_drvdata(pdev, pinctrl);
spin_lock_init(&pinctrl->lock);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
pinctrl->base0 = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(pinctrl->base0))
return PTR_ERR(pinctrl->base0);
res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
if (!res)
return -EINVAL;
pinctrl->base1 = devm_ioremap_nocache(&pdev->dev, res->start,
resource_size(res));
if (!pinctrl->base1) {
dev_err(&pdev->dev, "unable to map I/O space\n");
return -ENOMEM;
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
pinctrl->pinconf_base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(pinctrl->pinconf_base))
return PTR_ERR(pinctrl->pinconf_base);
ret = ns2_mux_log_init(pinctrl);
if (ret) {
dev_err(&pdev->dev, "unable to initialize IOMUX log\n");
return ret;
}
pins = devm_kcalloc(&pdev->dev, num_pins, sizeof(*pins), GFP_KERNEL);
if (!pins)
return -ENOMEM;
for (i = 0; i < num_pins; i++) {
pins[i].number = ns2_pins[i].pin;
pins[i].name = ns2_pins[i].name;
pins[i].drv_data = &ns2_pins[i];
}
pinctrl->groups = ns2_pin_groups;
pinctrl->num_groups = ARRAY_SIZE(ns2_pin_groups);
pinctrl->functions = ns2_pin_functions;
pinctrl->num_functions = ARRAY_SIZE(ns2_pin_functions);
ns2_pinctrl_desc.pins = pins;
ns2_pinctrl_desc.npins = num_pins;
pinctrl->pctl = pinctrl_register(&ns2_pinctrl_desc, &pdev->dev,
pinctrl);
if (IS_ERR(pinctrl->pctl)) {
dev_err(&pdev->dev, "unable to register IOMUX pinctrl\n");
return PTR_ERR(pinctrl->pctl);
}
return 0;
}
static const struct of_device_id ns2_pinmux_of_match[] = {
{.compatible = "brcm,ns2-pinmux"},
{ }
};
static struct platform_driver ns2_pinmux_driver = {
.driver = {
.name = "ns2-pinmux",
.of_match_table = ns2_pinmux_of_match,
},
.probe = ns2_pinmux_probe,
};
static int __init ns2_pinmux_init(void)
{
return platform_driver_register(&ns2_pinmux_driver);
}
arch_initcall(ns2_pinmux_init);
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