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Release 4.14 drivers/mfd/vexpress-sysreg.c

Directory: drivers/mfd
/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * Copyright (C) 2012 ARM Limited
 */

#include <linux/gpio/driver.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/mfd/core.h>
#include <linux/of_address.h>
#include <linux/of_platform.h>
#include <linux/platform_data/syscon.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/stat.h>
#include <linux/vexpress.h>


#define SYS_ID			0x000

#define SYS_SW			0x004

#define SYS_LED			0x008

#define SYS_100HZ		0x024

#define SYS_FLAGSSET		0x030

#define SYS_FLAGSCLR		0x034

#define SYS_NVFLAGS		0x038

#define SYS_NVFLAGSSET		0x038

#define SYS_NVFLAGSCLR		0x03c

#define SYS_MCI			0x048

#define SYS_FLASH		0x04c

#define SYS_CFGSW		0x058

#define SYS_24MHZ		0x05c

#define SYS_MISC		0x060

#define SYS_DMA			0x064

#define SYS_PROCID0		0x084

#define SYS_PROCID1		0x088

#define SYS_CFGDATA		0x0a0

#define SYS_CFGCTRL		0x0a4

#define SYS_CFGSTAT		0x0a8


#define SYS_HBI_MASK		0xfff

#define SYS_PROCIDx_HBI_SHIFT	0


#define SYS_MISC_MASTERSITE	(1 << 14)


void vexpress_flags_set(u32 data) { static void __iomem *base; if (!base) { struct device_node *node = of_find_compatible_node(NULL, NULL, "arm,vexpress-sysreg"); base = of_iomap(node, 0); } if (WARN_ON(!base)) return; writel(~0, base + SYS_FLAGSCLR); writel(data, base + SYS_FLAGSSET); }

Contributors

PersonTokensPropCommitsCommitProp
Pawel Moll72100.00%4100.00%
Total72100.00%4100.00%

/* The sysreg block is just a random collection of various functions... */ static struct syscon_platform_data vexpress_sysreg_sys_id_pdata = { .label = "sys_id", }; static struct bgpio_pdata vexpress_sysreg_sys_led_pdata = { .label = "sys_led", .base = -1, .ngpio = 8, }; static struct bgpio_pdata vexpress_sysreg_sys_mci_pdata = { .label = "sys_mci", .base = -1, .ngpio = 2, }; static struct bgpio_pdata vexpress_sysreg_sys_flash_pdata = { .label = "sys_flash", .base = -1, .ngpio = 1, }; static struct syscon_platform_data vexpress_sysreg_sys_misc_pdata = { .label = "sys_misc", }; static struct syscon_platform_data vexpress_sysreg_sys_procid_pdata = { .label = "sys_procid", }; static struct mfd_cell vexpress_sysreg_cells[] = { { .name = "syscon", .num_resources = 1, .resources = (struct resource []) { DEFINE_RES_MEM(SYS_ID, 0x4), }, .platform_data = &vexpress_sysreg_sys_id_pdata, .pdata_size = sizeof(vexpress_sysreg_sys_id_pdata), }, { .name = "basic-mmio-gpio", .of_compatible = "arm,vexpress-sysreg,sys_led", .num_resources = 1, .resources = (struct resource []) { DEFINE_RES_MEM_NAMED(SYS_LED, 0x4, "dat"), }, .platform_data = &vexpress_sysreg_sys_led_pdata, .pdata_size = sizeof(vexpress_sysreg_sys_led_pdata), }, { .name = "basic-mmio-gpio", .of_compatible = "arm,vexpress-sysreg,sys_mci", .num_resources = 1, .resources = (struct resource []) { DEFINE_RES_MEM_NAMED(SYS_MCI, 0x4, "dat"), }, .platform_data = &vexpress_sysreg_sys_mci_pdata, .pdata_size = sizeof(vexpress_sysreg_sys_mci_pdata), }, { .name = "basic-mmio-gpio", .of_compatible = "arm,vexpress-sysreg,sys_flash", .num_resources = 1, .resources = (struct resource []) { DEFINE_RES_MEM_NAMED(SYS_FLASH, 0x4, "dat"), }, .platform_data = &vexpress_sysreg_sys_flash_pdata, .pdata_size = sizeof(vexpress_sysreg_sys_flash_pdata), }, { .name = "syscon", .num_resources = 1, .resources = (struct resource []) { DEFINE_RES_MEM(SYS_MISC, 0x4), }, .platform_data = &vexpress_sysreg_sys_misc_pdata, .pdata_size = sizeof(vexpress_sysreg_sys_misc_pdata), }, { .name = "syscon", .num_resources = 1, .resources = (struct resource []) { DEFINE_RES_MEM(SYS_PROCID0, 0x8), }, .platform_data = &vexpress_sysreg_sys_procid_pdata, .pdata_size = sizeof(vexpress_sysreg_sys_procid_pdata), }, { .name = "vexpress-syscfg", .num_resources = 1, .resources = (struct resource []) { DEFINE_RES_MEM(SYS_CFGDATA, 0xc), }, } };
static int vexpress_sysreg_probe(struct platform_device *pdev) { struct resource *mem; void __iomem *base; struct gpio_chip *mmc_gpio_chip; int master; u32 dt_hbi; mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!mem) return -EINVAL; base = devm_ioremap(&pdev->dev, mem->start, resource_size(mem)); if (!base) return -ENOMEM; master = readl(base + SYS_MISC) & SYS_MISC_MASTERSITE ? VEXPRESS_SITE_DB2 : VEXPRESS_SITE_DB1; vexpress_config_set_master(master); /* Confirm board type against DT property, if available */ if (of_property_read_u32(of_root, "arm,hbi", &dt_hbi) == 0) { u32 id = readl(base + (master == VEXPRESS_SITE_DB1 ? SYS_PROCID0 : SYS_PROCID1)); u32 hbi = (id >> SYS_PROCIDx_HBI_SHIFT) & SYS_HBI_MASK; if (WARN_ON(dt_hbi != hbi)) dev_warn(&pdev->dev, "DT HBI (%x) is not matching hardware (%x)!\n", dt_hbi, hbi); } /* * Duplicated SYS_MCI pseudo-GPIO controller for compatibility with * older trees using sysreg node for MMC control lines. */ mmc_gpio_chip = devm_kzalloc(&pdev->dev, sizeof(*mmc_gpio_chip), GFP_KERNEL); if (!mmc_gpio_chip) return -ENOMEM; bgpio_init(mmc_gpio_chip, &pdev->dev, 0x4, base + SYS_MCI, NULL, NULL, NULL, NULL, 0); mmc_gpio_chip->ngpio = 2; gpiochip_add_data(mmc_gpio_chip, NULL); return mfd_add_devices(&pdev->dev, PLATFORM_DEVID_AUTO, vexpress_sysreg_cells, ARRAY_SIZE(vexpress_sysreg_cells), mem, 0, NULL); }

Contributors

PersonTokensPropCommitsCommitProp
Pawel Moll25598.08%666.67%
Linus Walleij41.54%222.22%
Grant C. Likely10.38%111.11%
Total260100.00%9100.00%

static const struct of_device_id vexpress_sysreg_match[] = { { .compatible = "arm,vexpress-sysreg", }, {}, }; static struct platform_driver vexpress_sysreg_driver = { .driver = { .name = "vexpress-sysreg", .of_match_table = vexpress_sysreg_match, }, .probe = vexpress_sysreg_probe, };
static int __init vexpress_sysreg_init(void) { struct device_node *node; /* Need the sysreg early, before any other device... */ for_each_matching_node(node, vexpress_sysreg_match) of_platform_device_create(node, NULL, NULL); return platform_driver_register(&vexpress_sysreg_driver); }

Contributors

PersonTokensPropCommitsCommitProp
Pawel Moll3697.30%266.67%
Catalin Marinas12.70%133.33%
Total37100.00%3100.00%

core_initcall(vexpress_sysreg_init);

Overall Contributors

PersonTokensPropCommitsCommitProp
Pawel Moll96099.28%763.64%
Linus Walleij50.52%218.18%
Grant C. Likely10.10%19.09%
Catalin Marinas10.10%19.09%
Total967100.00%11100.00%
Directory: drivers/mfd
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