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linux/drivers/pinctrl/intel/pinctrl-merrifield.c
Andy Shevchenko 03a61f11c0 pinctrl: merrifield: Set default bias in case no particular value given 
When GPIO library asks pin control to set the bias, it doesn't pass
any value of it and argument is considered boolean (and this is true
for ACPI GpioIo() / GpioInt() resources, by the way). Thus, individual
drivers must behave well, when they got the resistance value of 1 Ohm,
i.e. transforming it to sane default.

In case of Intel Merrifield pin control hardware the 20 kOhm sounds plausible
because it gives a good trade off between weakness and minimization of leakage
current (will be only 50 uA with the above choice).

Fixes: 4e80c8f505 ("pinctrl: intel: Add Intel Merrifield pin controller support")
Depends-on: 2956b5d94a ("pinctrl / gpio: Introduce .set_config() callback for GPIO chips")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
2020-11-16 12:07:57 +02:00

984 lines
26 KiB
C
Raw Blame History

// SPDX-License-Identifier: GPL-2.0
/*
* Intel Merrifield SoC pinctrl driver
*
* Copyright (C) 2016, Intel Corporation
* Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
*/
#include <linux/bits.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/platform_device.h>
#include <linux/pinctrl/pinconf.h>
#include <linux/pinctrl/pinconf-generic.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/pinctrl/pinmux.h>
#include "pinctrl-intel.h"
#define MRFLD_FAMILY_NR 64
#define MRFLD_FAMILY_LEN 0x400
#define SLEW_OFFSET 0x000
#define BUFCFG_OFFSET 0x100
#define MISC_OFFSET 0x300
#define BUFCFG_PINMODE_SHIFT 0
#define BUFCFG_PINMODE_MASK GENMASK(2, 0)
#define BUFCFG_PINMODE_GPIO 0
#define BUFCFG_PUPD_VAL_SHIFT 4
#define BUFCFG_PUPD_VAL_MASK GENMASK(5, 4)
#define BUFCFG_PUPD_VAL_2K 0
#define BUFCFG_PUPD_VAL_20K 1
#define BUFCFG_PUPD_VAL_50K 2
#define BUFCFG_PUPD_VAL_910 3
#define BUFCFG_PU_EN BIT(8)
#define BUFCFG_PD_EN BIT(9)
#define BUFCFG_Px_EN_MASK GENMASK(9, 8)
#define BUFCFG_SLEWSEL BIT(10)
#define BUFCFG_OVINEN BIT(12)
#define BUFCFG_OVINEN_EN BIT(13)
#define BUFCFG_OVINEN_MASK GENMASK(13, 12)
#define BUFCFG_OVOUTEN BIT(14)
#define BUFCFG_OVOUTEN_EN BIT(15)
#define BUFCFG_OVOUTEN_MASK GENMASK(15, 14)
#define BUFCFG_INDATAOV_VAL BIT(16)
#define BUFCFG_INDATAOV_EN BIT(17)
#define BUFCFG_INDATAOV_MASK GENMASK(17, 16)
#define BUFCFG_OUTDATAOV_VAL BIT(18)
#define BUFCFG_OUTDATAOV_EN BIT(19)
#define BUFCFG_OUTDATAOV_MASK GENMASK(19, 18)
#define BUFCFG_OD_EN BIT(21)
/**
* struct mrfld_family - Intel pin family description
* @barno: MMIO BAR number where registers for this family reside
* @pin_base: Starting pin of pins in this family
* @npins: Number of pins in this family
* @protected: True if family is protected by access
* @regs: family specific common registers
*/
struct mrfld_family {
unsigned int barno;
unsigned int pin_base;
size_t npins;
bool protected;
void __iomem *regs;
};
#define MRFLD_FAMILY(b, s, e) \
{ \
.barno = (b), \
.pin_base = (s), \
.npins = (e) - (s) + 1, \
}
#define MRFLD_FAMILY_PROTECTED(b, s, e) \
{ \
.barno = (b), \
.pin_base = (s), \
.npins = (e) - (s) + 1, \
.protected = true, \
}
static const struct pinctrl_pin_desc mrfld_pins[] = {
/* Family 0: OCP2SSC (0 pins) */
/* Family 1: ULPI (13 pins) */
PINCTRL_PIN(0, "ULPI_CLK"),
PINCTRL_PIN(1, "ULPI_D0"),
PINCTRL_PIN(2, "ULPI_D1"),
PINCTRL_PIN(3, "ULPI_D2"),
PINCTRL_PIN(4, "ULPI_D3"),
PINCTRL_PIN(5, "ULPI_D4"),
PINCTRL_PIN(6, "ULPI_D5"),
PINCTRL_PIN(7, "ULPI_D6"),
PINCTRL_PIN(8, "ULPI_D7"),
PINCTRL_PIN(9, "ULPI_DIR"),
PINCTRL_PIN(10, "ULPI_NXT"),
PINCTRL_PIN(11, "ULPI_REFCLK"),
PINCTRL_PIN(12, "ULPI_STP"),
/* Family 2: eMMC (24 pins) */
PINCTRL_PIN(13, "EMMC_CLK"),
PINCTRL_PIN(14, "EMMC_CMD"),
PINCTRL_PIN(15, "EMMC_D0"),
PINCTRL_PIN(16, "EMMC_D1"),
PINCTRL_PIN(17, "EMMC_D2"),
PINCTRL_PIN(18, "EMMC_D3"),
PINCTRL_PIN(19, "EMMC_D4"),
PINCTRL_PIN(20, "EMMC_D5"),
PINCTRL_PIN(21, "EMMC_D6"),
PINCTRL_PIN(22, "EMMC_D7"),
PINCTRL_PIN(23, "EMMC_RST_N"),
PINCTRL_PIN(24, "GP154"),
PINCTRL_PIN(25, "GP155"),
PINCTRL_PIN(26, "GP156"),
PINCTRL_PIN(27, "GP157"),
PINCTRL_PIN(28, "GP158"),
PINCTRL_PIN(29, "GP159"),
PINCTRL_PIN(30, "GP160"),
PINCTRL_PIN(31, "GP161"),
PINCTRL_PIN(32, "GP162"),
PINCTRL_PIN(33, "GP163"),
PINCTRL_PIN(34, "GP97"),
PINCTRL_PIN(35, "GP14"),
PINCTRL_PIN(36, "GP15"),
/* Family 3: SDIO (20 pins) */
PINCTRL_PIN(37, "GP77_SD_CD"),
PINCTRL_PIN(38, "GP78_SD_CLK"),
PINCTRL_PIN(39, "GP79_SD_CMD"),
PINCTRL_PIN(40, "GP80_SD_D0"),
PINCTRL_PIN(41, "GP81_SD_D1"),
PINCTRL_PIN(42, "GP82_SD_D2"),
PINCTRL_PIN(43, "GP83_SD_D3"),
PINCTRL_PIN(44, "GP84_SD_LS_CLK_FB"),
PINCTRL_PIN(45, "GP85_SD_LS_CMD_DIR"),
PINCTRL_PIN(46, "GP86_SD_LS_D_DIR"),
PINCTRL_PIN(47, "GP88_SD_LS_SEL"),
PINCTRL_PIN(48, "GP87_SD_PD"),
PINCTRL_PIN(49, "GP89_SD_WP"),
PINCTRL_PIN(50, "GP90_SDIO_CLK"),
PINCTRL_PIN(51, "GP91_SDIO_CMD"),
PINCTRL_PIN(52, "GP92_SDIO_D0"),
PINCTRL_PIN(53, "GP93_SDIO_D1"),
PINCTRL_PIN(54, "GP94_SDIO_D2"),
PINCTRL_PIN(55, "GP95_SDIO_D3"),
PINCTRL_PIN(56, "GP96_SDIO_PD"),
/* Family 4: HSI (8 pins) */
PINCTRL_PIN(57, "HSI_ACDATA"),
PINCTRL_PIN(58, "HSI_ACFLAG"),
PINCTRL_PIN(59, "HSI_ACREADY"),
PINCTRL_PIN(60, "HSI_ACWAKE"),
PINCTRL_PIN(61, "HSI_CADATA"),
PINCTRL_PIN(62, "HSI_CAFLAG"),
PINCTRL_PIN(63, "HSI_CAREADY"),
PINCTRL_PIN(64, "HSI_CAWAKE"),
/* Family 5: SSP Audio (14 pins) */
PINCTRL_PIN(65, "GP70"),
PINCTRL_PIN(66, "GP71"),
PINCTRL_PIN(67, "GP32_I2S_0_CLK"),
PINCTRL_PIN(68, "GP33_I2S_0_FS"),
PINCTRL_PIN(69, "GP34_I2S_0_RXD"),
PINCTRL_PIN(70, "GP35_I2S_0_TXD"),
PINCTRL_PIN(71, "GP36_I2S_1_CLK"),
PINCTRL_PIN(72, "GP37_I2S_1_FS"),
PINCTRL_PIN(73, "GP38_I2S_1_RXD"),
PINCTRL_PIN(74, "GP39_I2S_1_TXD"),
PINCTRL_PIN(75, "GP40_I2S_2_CLK"),
PINCTRL_PIN(76, "GP41_I2S_2_FS"),
PINCTRL_PIN(77, "GP42_I2S_2_RXD"),
PINCTRL_PIN(78, "GP43_I2S_2_TXD"),
/* Family 6: GP SSP (22 pins) */
PINCTRL_PIN(79, "GP120_SPI_0_CLK"),
PINCTRL_PIN(80, "GP121_SPI_0_SS"),
PINCTRL_PIN(81, "GP122_SPI_0_RXD"),
PINCTRL_PIN(82, "GP123_SPI_0_TXD"),
PINCTRL_PIN(83, "GP102_SPI_1_CLK"),
PINCTRL_PIN(84, "GP103_SPI_1_SS0"),
PINCTRL_PIN(85, "GP104_SPI_1_SS1"),
PINCTRL_PIN(86, "GP105_SPI_1_SS2"),
PINCTRL_PIN(87, "GP106_SPI_1_SS3"),
PINCTRL_PIN(88, "GP107_SPI_1_RXD"),
PINCTRL_PIN(89, "GP108_SPI_1_TXD"),
PINCTRL_PIN(90, "GP109_SPI_2_CLK"),
PINCTRL_PIN(91, "GP110_SPI_2_SS0"),
PINCTRL_PIN(92, "GP111_SPI_2_SS1"),
PINCTRL_PIN(93, "GP112_SPI_2_SS2"),
PINCTRL_PIN(94, "GP113_SPI_2_SS3"),
PINCTRL_PIN(95, "GP114_SPI_2_RXD"),
PINCTRL_PIN(96, "GP115_SPI_2_TXD"),
PINCTRL_PIN(97, "GP116_SPI_3_CLK"),
PINCTRL_PIN(98, "GP117_SPI_3_SS"),
PINCTRL_PIN(99, "GP118_SPI_3_RXD"),
PINCTRL_PIN(100, "GP119_SPI_3_TXD"),
/* Family 7: I2C (14 pins) */
PINCTRL_PIN(101, "GP19_I2C_1_SCL"),
PINCTRL_PIN(102, "GP20_I2C_1_SDA"),
PINCTRL_PIN(103, "GP21_I2C_2_SCL"),
PINCTRL_PIN(104, "GP22_I2C_2_SDA"),
PINCTRL_PIN(105, "GP17_I2C_3_SCL_HDMI"),
PINCTRL_PIN(106, "GP18_I2C_3_SDA_HDMI"),
PINCTRL_PIN(107, "GP23_I2C_4_SCL"),
PINCTRL_PIN(108, "GP24_I2C_4_SDA"),
PINCTRL_PIN(109, "GP25_I2C_5_SCL"),
PINCTRL_PIN(110, "GP26_I2C_5_SDA"),
PINCTRL_PIN(111, "GP27_I2C_6_SCL"),
PINCTRL_PIN(112, "GP28_I2C_6_SDA"),
PINCTRL_PIN(113, "GP29_I2C_7_SCL"),
PINCTRL_PIN(114, "GP30_I2C_7_SDA"),
/* Family 8: UART (12 pins) */
PINCTRL_PIN(115, "GP124_UART_0_CTS"),
PINCTRL_PIN(116, "GP125_UART_0_RTS"),
PINCTRL_PIN(117, "GP126_UART_0_RX"),
PINCTRL_PIN(118, "GP127_UART_0_TX"),
PINCTRL_PIN(119, "GP128_UART_1_CTS"),
PINCTRL_PIN(120, "GP129_UART_1_RTS"),
PINCTRL_PIN(121, "GP130_UART_1_RX"),
PINCTRL_PIN(122, "GP131_UART_1_TX"),
PINCTRL_PIN(123, "GP132_UART_2_CTS"),
PINCTRL_PIN(124, "GP133_UART_2_RTS"),
PINCTRL_PIN(125, "GP134_UART_2_RX"),
PINCTRL_PIN(126, "GP135_UART_2_TX"),
/* Family 9: GPIO South (19 pins) */
PINCTRL_PIN(127, "GP177"),
PINCTRL_PIN(128, "GP178"),
PINCTRL_PIN(129, "GP179"),
PINCTRL_PIN(130, "GP180"),
PINCTRL_PIN(131, "GP181"),
PINCTRL_PIN(132, "GP182_PWM2"),
PINCTRL_PIN(133, "GP183_PWM3"),
PINCTRL_PIN(134, "GP184"),
PINCTRL_PIN(135, "GP185"),
PINCTRL_PIN(136, "GP186"),
PINCTRL_PIN(137, "GP187"),
PINCTRL_PIN(138, "GP188"),
PINCTRL_PIN(139, "GP189"),
PINCTRL_PIN(140, "GP64_FAST_INT0"),
PINCTRL_PIN(141, "GP65_FAST_INT1"),
PINCTRL_PIN(142, "GP66_FAST_INT2"),
PINCTRL_PIN(143, "GP67_FAST_INT3"),
PINCTRL_PIN(144, "GP12_PWM0"),
PINCTRL_PIN(145, "GP13_PWM1"),
/* Family 10: Camera Sideband (12 pins) */
PINCTRL_PIN(146, "GP0"),
PINCTRL_PIN(147, "GP1"),
PINCTRL_PIN(148, "GP2"),
PINCTRL_PIN(149, "GP3"),
PINCTRL_PIN(150, "GP4"),
PINCTRL_PIN(151, "GP5"),
PINCTRL_PIN(152, "GP6"),
PINCTRL_PIN(153, "GP7"),
PINCTRL_PIN(154, "GP8"),
PINCTRL_PIN(155, "GP9"),
PINCTRL_PIN(156, "GP10"),
PINCTRL_PIN(157, "GP11"),
/* Family 11: Clock (22 pins) */
PINCTRL_PIN(158, "GP137"),
PINCTRL_PIN(159, "GP138"),
PINCTRL_PIN(160, "GP139"),
PINCTRL_PIN(161, "GP140"),
PINCTRL_PIN(162, "GP141"),
PINCTRL_PIN(163, "GP142"),
PINCTRL_PIN(164, "GP16_HDMI_HPD"),
PINCTRL_PIN(165, "GP68_DSI_A_TE"),
PINCTRL_PIN(166, "GP69_DSI_C_TE"),
PINCTRL_PIN(167, "OSC_CLK_CTRL0"),
PINCTRL_PIN(168, "OSC_CLK_CTRL1"),
PINCTRL_PIN(169, "OSC_CLK0"),
PINCTRL_PIN(170, "OSC_CLK1"),
PINCTRL_PIN(171, "OSC_CLK2"),
PINCTRL_PIN(172, "OSC_CLK3"),
PINCTRL_PIN(173, "OSC_CLK4"),
PINCTRL_PIN(174, "RESETOUT"),
PINCTRL_PIN(175, "PMODE"),
PINCTRL_PIN(176, "PRDY"),
PINCTRL_PIN(177, "PREQ"),
PINCTRL_PIN(178, "GP190"),
PINCTRL_PIN(179, "GP191"),
/* Family 12: MSIC (15 pins) */
PINCTRL_PIN(180, "I2C_0_SCL"),
PINCTRL_PIN(181, "I2C_0_SDA"),
PINCTRL_PIN(182, "IERR"),
PINCTRL_PIN(183, "JTAG_TCK"),
PINCTRL_PIN(184, "JTAG_TDI"),
PINCTRL_PIN(185, "JTAG_TDO"),
PINCTRL_PIN(186, "JTAG_TMS"),
PINCTRL_PIN(187, "JTAG_TRST"),
PINCTRL_PIN(188, "PROCHOT"),
PINCTRL_PIN(189, "RTC_CLK"),
PINCTRL_PIN(190, "SVID_ALERT"),
PINCTRL_PIN(191, "SVID_CLK"),
PINCTRL_PIN(192, "SVID_D"),
PINCTRL_PIN(193, "THERMTRIP"),
PINCTRL_PIN(194, "STANDBY"),
/* Family 13: Keyboard (20 pins) */
PINCTRL_PIN(195, "GP44"),
PINCTRL_PIN(196, "GP45"),
PINCTRL_PIN(197, "GP46"),
PINCTRL_PIN(198, "GP47"),
PINCTRL_PIN(199, "GP48"),
PINCTRL_PIN(200, "GP49"),
PINCTRL_PIN(201, "GP50"),
PINCTRL_PIN(202, "GP51"),
PINCTRL_PIN(203, "GP52"),
PINCTRL_PIN(204, "GP53"),
PINCTRL_PIN(205, "GP54"),
PINCTRL_PIN(206, "GP55"),
PINCTRL_PIN(207, "GP56"),
PINCTRL_PIN(208, "GP57"),
PINCTRL_PIN(209, "GP58"),
PINCTRL_PIN(210, "GP59"),
PINCTRL_PIN(211, "GP60"),
PINCTRL_PIN(212, "GP61"),
PINCTRL_PIN(213, "GP62"),
PINCTRL_PIN(214, "GP63"),
/* Family 14: GPIO North (13 pins) */
PINCTRL_PIN(215, "GP164"),
PINCTRL_PIN(216, "GP165"),
PINCTRL_PIN(217, "GP166"),
PINCTRL_PIN(218, "GP167"),
PINCTRL_PIN(219, "GP168_MJTAG_TCK"),
PINCTRL_PIN(220, "GP169_MJTAG_TDI"),
PINCTRL_PIN(221, "GP170_MJTAG_TDO"),
PINCTRL_PIN(222, "GP171_MJTAG_TMS"),
PINCTRL_PIN(223, "GP172_MJTAG_TRST"),
PINCTRL_PIN(224, "GP173"),
PINCTRL_PIN(225, "GP174"),
PINCTRL_PIN(226, "GP175"),
PINCTRL_PIN(227, "GP176"),
/* Family 15: PTI (5 pins) */
PINCTRL_PIN(228, "GP72_PTI_CLK"),
PINCTRL_PIN(229, "GP73_PTI_D0"),
PINCTRL_PIN(230, "GP74_PTI_D1"),
PINCTRL_PIN(231, "GP75_PTI_D2"),
PINCTRL_PIN(232, "GP76_PTI_D3"),
/* Family 16: USB3 (0 pins) */
/* Family 17: HSIC (0 pins) */
/* Family 18: Broadcast (0 pins) */
};
static const unsigned int mrfld_sdio_pins[] = { 50, 51, 52, 53, 54, 55, 56 };
static const unsigned int mrfld_i2s2_pins[] = { 75, 76, 77, 78 };
static const unsigned int mrfld_spi5_pins[] = { 90, 91, 92, 93, 94, 95, 96 };
static const unsigned int mrfld_uart0_pins[] = { 115, 116, 117, 118 };
static const unsigned int mrfld_uart1_pins[] = { 119, 120, 121, 122 };
static const unsigned int mrfld_uart2_pins[] = { 123, 124, 125, 126 };
static const unsigned int mrfld_pwm0_pins[] = { 144 };
static const unsigned int mrfld_pwm1_pins[] = { 145 };
static const unsigned int mrfld_pwm2_pins[] = { 132 };
static const unsigned int mrfld_pwm3_pins[] = { 133 };
static const struct intel_pingroup mrfld_groups[] = {
PIN_GROUP("sdio_grp", mrfld_sdio_pins, 1),
PIN_GROUP("i2s2_grp", mrfld_i2s2_pins, 1),
PIN_GROUP("spi5_grp", mrfld_spi5_pins, 1),
PIN_GROUP("uart0_grp", mrfld_uart0_pins, 1),
PIN_GROUP("uart1_grp", mrfld_uart1_pins, 1),
PIN_GROUP("uart2_grp", mrfld_uart2_pins, 1),
PIN_GROUP("pwm0_grp", mrfld_pwm0_pins, 1),
PIN_GROUP("pwm1_grp", mrfld_pwm1_pins, 1),
PIN_GROUP("pwm2_grp", mrfld_pwm2_pins, 1),
PIN_GROUP("pwm3_grp", mrfld_pwm3_pins, 1),
};
static const char * const mrfld_sdio_groups[] = { "sdio_grp" };
static const char * const mrfld_i2s2_groups[] = { "i2s2_grp" };
static const char * const mrfld_spi5_groups[] = { "spi5_grp" };
static const char * const mrfld_uart0_groups[] = { "uart0_grp" };
static const char * const mrfld_uart1_groups[] = { "uart1_grp" };
static const char * const mrfld_uart2_groups[] = { "uart2_grp" };
static const char * const mrfld_pwm0_groups[] = { "pwm0_grp" };
static const char * const mrfld_pwm1_groups[] = { "pwm1_grp" };
static const char * const mrfld_pwm2_groups[] = { "pwm2_grp" };
static const char * const mrfld_pwm3_groups[] = { "pwm3_grp" };
static const struct intel_function mrfld_functions[] = {
FUNCTION("sdio", mrfld_sdio_groups),
FUNCTION("i2s2", mrfld_i2s2_groups),
FUNCTION("spi5", mrfld_spi5_groups),
FUNCTION("uart0", mrfld_uart0_groups),
FUNCTION("uart1", mrfld_uart1_groups),
FUNCTION("uart2", mrfld_uart2_groups),
FUNCTION("pwm0", mrfld_pwm0_groups),
FUNCTION("pwm1", mrfld_pwm1_groups),
FUNCTION("pwm2", mrfld_pwm2_groups),
FUNCTION("pwm3", mrfld_pwm3_groups),
};
static const struct mrfld_family mrfld_families[] = {
MRFLD_FAMILY(1, 0, 12),
MRFLD_FAMILY(2, 13, 36),
MRFLD_FAMILY(3, 37, 56),
MRFLD_FAMILY(4, 57, 64),
MRFLD_FAMILY(5, 65, 78),
MRFLD_FAMILY(6, 79, 100),
MRFLD_FAMILY_PROTECTED(7, 101, 114),
MRFLD_FAMILY(8, 115, 126),
MRFLD_FAMILY(9, 127, 145),
MRFLD_FAMILY(10, 146, 157),
MRFLD_FAMILY(11, 158, 179),
MRFLD_FAMILY_PROTECTED(12, 180, 194),
MRFLD_FAMILY(13, 195, 214),
MRFLD_FAMILY(14, 215, 227),
MRFLD_FAMILY(15, 228, 232),
};
/**
* struct mrfld_pinctrl - Intel Merrifield pinctrl private structure
* @dev: Pointer to the device structure
* @lock: Lock to serialize register access
* @pctldesc: Pin controller description
* @pctldev: Pointer to the pin controller device
* @families: Array of families this pinctrl handles
* @nfamilies: Number of families in the array
* @functions: Array of functions
* @nfunctions: Number of functions in the array
* @groups: Array of pin groups
* @ngroups: Number of groups in the array
* @pins: Array of pins this pinctrl controls
* @npins: Number of pins in the array
*/
struct mrfld_pinctrl {
struct device *dev;
raw_spinlock_t lock;
struct pinctrl_desc pctldesc;
struct pinctrl_dev *pctldev;
/* Pin controller configuration */
const struct mrfld_family *families;
size_t nfamilies;
const struct intel_function *functions;
size_t nfunctions;
const struct intel_pingroup *groups;
size_t ngroups;
const struct pinctrl_pin_desc *pins;
size_t npins;
};
#define pin_to_bufno(f, p) ((p) - (f)->pin_base)
static const struct mrfld_family *mrfld_get_family(struct mrfld_pinctrl *mp,
unsigned int pin)
{
const struct mrfld_family *family;
unsigned int i;
for (i = 0; i < mp->nfamilies; i++) {
family = &mp->families[i];
if (pin >= family->pin_base &&
pin < family->pin_base + family->npins)
return family;
}
dev_warn(mp->dev, "failed to find family for pin %u\n", pin);
return NULL;
}
static bool mrfld_buf_available(struct mrfld_pinctrl *mp, unsigned int pin)
{
const struct mrfld_family *family;
family = mrfld_get_family(mp, pin);
if (!family)
return false;
return !family->protected;
}
static void __iomem *mrfld_get_bufcfg(struct mrfld_pinctrl *mp, unsigned int pin)
{
const struct mrfld_family *family;
unsigned int bufno;
family = mrfld_get_family(mp, pin);
if (!family)
return NULL;
bufno = pin_to_bufno(family, pin);
return family->regs + BUFCFG_OFFSET + bufno * 4;
}
static int mrfld_read_bufcfg(struct mrfld_pinctrl *mp, unsigned int pin, u32 *value)
{
void __iomem *bufcfg;
if (!mrfld_buf_available(mp, pin))
return -EBUSY;
bufcfg = mrfld_get_bufcfg(mp, pin);
*value = readl(bufcfg);
return 0;
}
static void mrfld_update_bufcfg(struct mrfld_pinctrl *mp, unsigned int pin,
u32 bits, u32 mask)
{
void __iomem *bufcfg;
u32 value;
bufcfg = mrfld_get_bufcfg(mp, pin);
value = readl(bufcfg);
value &= ~mask;
value |= bits & mask;
writel(value, bufcfg);
}
static int mrfld_get_groups_count(struct pinctrl_dev *pctldev)
{
struct mrfld_pinctrl *mp = pinctrl_dev_get_drvdata(pctldev);
return mp->ngroups;
}
static const char *mrfld_get_group_name(struct pinctrl_dev *pctldev,
unsigned int group)
{
struct mrfld_pinctrl *mp = pinctrl_dev_get_drvdata(pctldev);
return mp->groups[group].name;
}
static int mrfld_get_group_pins(struct pinctrl_dev *pctldev, unsigned int group,
const unsigned int **pins, unsigned int *npins)
{
struct mrfld_pinctrl *mp = pinctrl_dev_get_drvdata(pctldev);
*pins = mp->groups[group].pins;
*npins = mp->groups[group].npins;
return 0;
}
static void mrfld_pin_dbg_show(struct pinctrl_dev *pctldev, struct seq_file *s,
unsigned int pin)
{
struct mrfld_pinctrl *mp = pinctrl_dev_get_drvdata(pctldev);
u32 value, mode;
int ret;
ret = mrfld_read_bufcfg(mp, pin, &value);
if (ret) {
seq_puts(s, "not available");
return;
}
mode = (value & BUFCFG_PINMODE_MASK) >> BUFCFG_PINMODE_SHIFT;
if (!mode)
seq_puts(s, "GPIO ");
else
seq_printf(s, "mode %d ", mode);
seq_printf(s, "0x%08x", value);
}
static const struct pinctrl_ops mrfld_pinctrl_ops = {
.get_groups_count = mrfld_get_groups_count,
.get_group_name = mrfld_get_group_name,
.get_group_pins = mrfld_get_group_pins,
.pin_dbg_show = mrfld_pin_dbg_show,
};
static int mrfld_get_functions_count(struct pinctrl_dev *pctldev)
{
struct mrfld_pinctrl *mp = pinctrl_dev_get_drvdata(pctldev);
return mp->nfunctions;
}
static const char *mrfld_get_function_name(struct pinctrl_dev *pctldev,
unsigned int function)
{
struct mrfld_pinctrl *mp = pinctrl_dev_get_drvdata(pctldev);
return mp->functions[function].name;
}
static int mrfld_get_function_groups(struct pinctrl_dev *pctldev,
unsigned int function,
const char * const **groups,
unsigned int * const ngroups)
{
struct mrfld_pinctrl *mp = pinctrl_dev_get_drvdata(pctldev);
*groups = mp->functions[function].groups;
*ngroups = mp->functions[function].ngroups;
return 0;
}
static int mrfld_pinmux_set_mux(struct pinctrl_dev *pctldev,
unsigned int function,
unsigned int group)
{
struct mrfld_pinctrl *mp = pinctrl_dev_get_drvdata(pctldev);
const struct intel_pingroup *grp = &mp->groups[group];
u32 bits = grp->mode << BUFCFG_PINMODE_SHIFT;
u32 mask = BUFCFG_PINMODE_MASK;
unsigned long flags;
unsigned int i;
/*
* All pins in the groups needs to be accessible and writable
* before we can enable the mux for this group.
*/
for (i = 0; i < grp->npins; i++) {
if (!mrfld_buf_available(mp, grp->pins[i]))
return -EBUSY;
}
/* Now enable the mux setting for each pin in the group */
raw_spin_lock_irqsave(&mp->lock, flags);
for (i = 0; i < grp->npins; i++)
mrfld_update_bufcfg(mp, grp->pins[i], bits, mask);
raw_spin_unlock_irqrestore(&mp->lock, flags);
return 0;
}
static int mrfld_gpio_request_enable(struct pinctrl_dev *pctldev,
struct pinctrl_gpio_range *range,
unsigned int pin)
{
struct mrfld_pinctrl *mp = pinctrl_dev_get_drvdata(pctldev);
u32 bits = BUFCFG_PINMODE_GPIO << BUFCFG_PINMODE_SHIFT;
u32 mask = BUFCFG_PINMODE_MASK;
unsigned long flags;
if (!mrfld_buf_available(mp, pin))
return -EBUSY;
raw_spin_lock_irqsave(&mp->lock, flags);
mrfld_update_bufcfg(mp, pin, bits, mask);
raw_spin_unlock_irqrestore(&mp->lock, flags);
return 0;
}
static const struct pinmux_ops mrfld_pinmux_ops = {
.get_functions_count = mrfld_get_functions_count,
.get_function_name = mrfld_get_function_name,
.get_function_groups = mrfld_get_function_groups,
.set_mux = mrfld_pinmux_set_mux,
.gpio_request_enable = mrfld_gpio_request_enable,
};
static int mrfld_config_get(struct pinctrl_dev *pctldev, unsigned int pin,
unsigned long *config)
{
struct mrfld_pinctrl *mp = pinctrl_dev_get_drvdata(pctldev);
enum pin_config_param param = pinconf_to_config_param(*config);
u32 value, term;
u16 arg = 0;
int ret;
ret = mrfld_read_bufcfg(mp, pin, &value);
if (ret)
return -ENOTSUPP;
term = (value & BUFCFG_PUPD_VAL_MASK) >> BUFCFG_PUPD_VAL_SHIFT;
switch (param) {
case PIN_CONFIG_BIAS_DISABLE:
if (value & BUFCFG_Px_EN_MASK)
return -EINVAL;
break;
case PIN_CONFIG_BIAS_PULL_UP:
if ((value & BUFCFG_Px_EN_MASK) != BUFCFG_PU_EN)
return -EINVAL;
switch (term) {
case BUFCFG_PUPD_VAL_910:
arg = 910;
break;
case BUFCFG_PUPD_VAL_2K:
arg = 2000;
break;
case BUFCFG_PUPD_VAL_20K:
arg = 20000;
break;
case BUFCFG_PUPD_VAL_50K:
arg = 50000;
break;
}
break;
case PIN_CONFIG_BIAS_PULL_DOWN:
if ((value & BUFCFG_Px_EN_MASK) != BUFCFG_PD_EN)
return -EINVAL;
switch (term) {
case BUFCFG_PUPD_VAL_910:
arg = 910;
break;
case BUFCFG_PUPD_VAL_2K:
arg = 2000;
break;
case BUFCFG_PUPD_VAL_20K:
arg = 20000;
break;
case BUFCFG_PUPD_VAL_50K:
arg = 50000;
break;
}
break;
case PIN_CONFIG_DRIVE_OPEN_DRAIN:
if (!(value & BUFCFG_OD_EN))
return -EINVAL;
break;
case PIN_CONFIG_SLEW_RATE:
if (!(value & BUFCFG_SLEWSEL))
arg = 0;
else
arg = 1;
break;
default:
return -ENOTSUPP;
}
*config = pinconf_to_config_packed(param, arg);
return 0;
}
static int mrfld_config_set_pin(struct mrfld_pinctrl *mp, unsigned int pin,
unsigned long config)
{
unsigned int param = pinconf_to_config_param(config);
unsigned int arg = pinconf_to_config_argument(config);
u32 bits = 0, mask = 0;
unsigned long flags;
switch (param) {
case PIN_CONFIG_BIAS_DISABLE:
mask |= BUFCFG_Px_EN_MASK | BUFCFG_PUPD_VAL_MASK;
break;
case PIN_CONFIG_BIAS_PULL_UP:
mask |= BUFCFG_Px_EN_MASK | BUFCFG_PUPD_VAL_MASK;
bits |= BUFCFG_PU_EN;
/* Set default strength value in case none is given */
if (arg == 1)
arg = 20000;
switch (arg) {
case 50000:
bits |= BUFCFG_PUPD_VAL_50K << BUFCFG_PUPD_VAL_SHIFT;
break;
case 20000:
bits |= BUFCFG_PUPD_VAL_20K << BUFCFG_PUPD_VAL_SHIFT;
break;
case 2000:
bits |= BUFCFG_PUPD_VAL_2K << BUFCFG_PUPD_VAL_SHIFT;
break;
default:
return -EINVAL;
}
break;
case PIN_CONFIG_BIAS_PULL_DOWN:
mask |= BUFCFG_Px_EN_MASK | BUFCFG_PUPD_VAL_MASK;
bits |= BUFCFG_PD_EN;
/* Set default strength value in case none is given */
if (arg == 1)
arg = 20000;
switch (arg) {
case 50000:
bits |= BUFCFG_PUPD_VAL_50K << BUFCFG_PUPD_VAL_SHIFT;
break;
case 20000:
bits |= BUFCFG_PUPD_VAL_20K << BUFCFG_PUPD_VAL_SHIFT;
break;
case 2000:
bits |= BUFCFG_PUPD_VAL_2K << BUFCFG_PUPD_VAL_SHIFT;
break;
default:
return -EINVAL;
}
break;
case PIN_CONFIG_DRIVE_OPEN_DRAIN:
mask |= BUFCFG_OD_EN;
if (arg)
bits |= BUFCFG_OD_EN;
break;
case PIN_CONFIG_SLEW_RATE:
mask |= BUFCFG_SLEWSEL;
if (arg)
bits |= BUFCFG_SLEWSEL;
break;
}
raw_spin_lock_irqsave(&mp->lock, flags);
mrfld_update_bufcfg(mp, pin, bits, mask);
raw_spin_unlock_irqrestore(&mp->lock, flags);
return 0;
}
static int mrfld_config_set(struct pinctrl_dev *pctldev, unsigned int pin,
unsigned long *configs, unsigned int nconfigs)
{
struct mrfld_pinctrl *mp = pinctrl_dev_get_drvdata(pctldev);
unsigned int i;
int ret;
if (!mrfld_buf_available(mp, pin))
return -ENOTSUPP;
for (i = 0; i < nconfigs; i++) {
switch (pinconf_to_config_param(configs[i])) {
case PIN_CONFIG_BIAS_DISABLE:
case PIN_CONFIG_BIAS_PULL_UP:
case PIN_CONFIG_BIAS_PULL_DOWN:
case PIN_CONFIG_DRIVE_OPEN_DRAIN:
case PIN_CONFIG_SLEW_RATE:
ret = mrfld_config_set_pin(mp, pin, configs[i]);
if (ret)
return ret;
break;
default:
return -ENOTSUPP;
}
}
return 0;
}
static int mrfld_config_group_get(struct pinctrl_dev *pctldev,
unsigned int group, unsigned long *config)
{
const unsigned int *pins;
unsigned int npins;
int ret;
ret = mrfld_get_group_pins(pctldev, group, &pins, &npins);
if (ret)
return ret;
ret = mrfld_config_get(pctldev, pins[0], config);
if (ret)
return ret;
return 0;
}
static int mrfld_config_group_set(struct pinctrl_dev *pctldev,
unsigned int group, unsigned long *configs,
unsigned int num_configs)
{
const unsigned int *pins;
unsigned int npins;
int i, ret;
ret = mrfld_get_group_pins(pctldev, group, &pins, &npins);
if (ret)
return ret;
for (i = 0; i < npins; i++) {
ret = mrfld_config_set(pctldev, pins[i], configs, num_configs);
if (ret)
return ret;
}
return 0;
}
static const struct pinconf_ops mrfld_pinconf_ops = {
.is_generic = true,
.pin_config_get = mrfld_config_get,
.pin_config_set = mrfld_config_set,
.pin_config_group_get = mrfld_config_group_get,
.pin_config_group_set = mrfld_config_group_set,
};
static const struct pinctrl_desc mrfld_pinctrl_desc = {
.pctlops = &mrfld_pinctrl_ops,
.pmxops = &mrfld_pinmux_ops,
.confops = &mrfld_pinconf_ops,
.owner = THIS_MODULE,
};
static int mrfld_pinctrl_probe(struct platform_device *pdev)
{
struct mrfld_family *families;
struct mrfld_pinctrl *mp;
void __iomem *regs;
size_t nfamilies;
unsigned int i;
mp = devm_kzalloc(&pdev->dev, sizeof(*mp), GFP_KERNEL);
if (!mp)
return -ENOMEM;
mp->dev = &pdev->dev;
raw_spin_lock_init(&mp->lock);
regs = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(regs))
return PTR_ERR(regs);
/*
* Make a copy of the families which we can use to hold pointers
* to the registers.
*/
nfamilies = ARRAY_SIZE(mrfld_families),
families = devm_kmemdup(&pdev->dev, mrfld_families,
sizeof(mrfld_families),
GFP_KERNEL);
if (!families)
return -ENOMEM;
/* Splice memory resource by chunk per family */
for (i = 0; i < nfamilies; i++) {
struct mrfld_family *family = &families[i];
family->regs = regs + family->barno * MRFLD_FAMILY_LEN;
}
mp->families = families;
mp->nfamilies = nfamilies;
mp->functions = mrfld_functions;
mp->nfunctions = ARRAY_SIZE(mrfld_functions);
mp->groups = mrfld_groups;
mp->ngroups = ARRAY_SIZE(mrfld_groups);
mp->pctldesc = mrfld_pinctrl_desc;
mp->pctldesc.name = dev_name(&pdev->dev);
mp->pctldesc.pins = mrfld_pins;
mp->pctldesc.npins = ARRAY_SIZE(mrfld_pins);
mp->pctldev = devm_pinctrl_register(&pdev->dev, &mp->pctldesc, mp);
if (IS_ERR(mp->pctldev)) {
dev_err(&pdev->dev, "failed to register pinctrl driver\n");
return PTR_ERR(mp->pctldev);
}
platform_set_drvdata(pdev, mp);
return 0;
}
static const struct acpi_device_id mrfld_acpi_table[] = {
{ "INTC1002" },
{ }
};
MODULE_DEVICE_TABLE(acpi, mrfld_acpi_table);
static struct platform_driver mrfld_pinctrl_driver = {
.probe = mrfld_pinctrl_probe,
.driver = {
.name = "pinctrl-merrifield",
.acpi_match_table = mrfld_acpi_table,
},
};
static int __init mrfld_pinctrl_init(void)
{
return platform_driver_register(&mrfld_pinctrl_driver);
}
subsys_initcall(mrfld_pinctrl_init);
static void __exit mrfld_pinctrl_exit(void)
{
platform_driver_unregister(&mrfld_pinctrl_driver);
}
module_exit(mrfld_pinctrl_exit);
MODULE_AUTHOR("Andy Shevchenko <andriy.shevchenko@linux.intel.com>");
MODULE_DESCRIPTION("Intel Merrifield SoC pinctrl driver");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:pinctrl-merrifield");
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