linux/drivers/mfd/vexpress-sysreg.c

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/*
* 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/basic_mmio_gpio.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/mfd/core.h>
#include <linux/of_address.h>
mfd: vexpress: Convert custom func API to regmap Components of the Versatile Express platform (configuration microcontrollers on motherboard and daughterboards in particular) talk to each other over a custom configuration bus. They provide miscellaneous functions (from clock generator control to energy sensors) which are represented as platform devices (and Device Tree nodes). The transactions on the bus can be generated by different "bridges" in the system, some of which are universal for the whole platform (for the price of high transfer latencies), others restricted to a subsystem (but much faster). Until now drivers for such functions were using custom "func" API, which is being replaced in this patch by regmap calls. This required: * a rework (and move to drivers/bus directory, as suggested by Samuel and Arnd) of the config bus core, which is much simpler now and uses device model infrastructure (class) to keep track of the bridges; non-DT case (soon to be retired anyway) is simply covered by a special device registration function * the new config-bus driver also takes over device population, so there is no need for special matching table for of_platform_populate nor "simple-bus" hack in the arm64 model dtsi file (relevant bindings documentation has been updated); this allows all the vexpress devices fit into normal device model, making it possible to remove plenty of early inits and other hacks in the near future * adaptation of the syscfg bridge implementation in the sysreg driver, again making it much simpler; there is a special case of the "energy" function spanning two registers, where they should be both defined in the tree now, but backward compatibility is maintained in the code * modification of the relevant drivers: * hwmon - just a straight-forward API change * power/reset driver - API change * regulator - API change plus error handling simplification * osc clock driver - this one required larger rework in order to turn in into a standard platform driver Signed-off-by: Pawel Moll <pawel.moll@arm.com> Acked-by: Mark Brown <broonie@linaro.org> Acked-by: Lee Jones <lee.jones@linaro.org> Acked-by: Guenter Roeck <linux@roeck-us.net> Acked-by: Mike Turquette <mturquette@linaro.org>
2014-04-30 23:46:29 +08:00
#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);
}
/* 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 bgpio_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->gc.ngpio = 2;
gpiochip_add(&mmc_gpio_chip->gc);
return mfd_add_devices(&pdev->dev, PLATFORM_DEVID_AUTO,
vexpress_sysreg_cells,
ARRAY_SIZE(vexpress_sysreg_cells), mem, 0, NULL);
}
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)
{
mfd: vexpress: Convert custom func API to regmap Components of the Versatile Express platform (configuration microcontrollers on motherboard and daughterboards in particular) talk to each other over a custom configuration bus. They provide miscellaneous functions (from clock generator control to energy sensors) which are represented as platform devices (and Device Tree nodes). The transactions on the bus can be generated by different "bridges" in the system, some of which are universal for the whole platform (for the price of high transfer latencies), others restricted to a subsystem (but much faster). Until now drivers for such functions were using custom "func" API, which is being replaced in this patch by regmap calls. This required: * a rework (and move to drivers/bus directory, as suggested by Samuel and Arnd) of the config bus core, which is much simpler now and uses device model infrastructure (class) to keep track of the bridges; non-DT case (soon to be retired anyway) is simply covered by a special device registration function * the new config-bus driver also takes over device population, so there is no need for special matching table for of_platform_populate nor "simple-bus" hack in the arm64 model dtsi file (relevant bindings documentation has been updated); this allows all the vexpress devices fit into normal device model, making it possible to remove plenty of early inits and other hacks in the near future * adaptation of the syscfg bridge implementation in the sysreg driver, again making it much simpler; there is a special case of the "energy" function spanning two registers, where they should be both defined in the tree now, but backward compatibility is maintained in the code * modification of the relevant drivers: * hwmon - just a straight-forward API change * power/reset driver - API change * regulator - API change plus error handling simplification * osc clock driver - this one required larger rework in order to turn in into a standard platform driver Signed-off-by: Pawel Moll <pawel.moll@arm.com> Acked-by: Mark Brown <broonie@linaro.org> Acked-by: Lee Jones <lee.jones@linaro.org> Acked-by: Guenter Roeck <linux@roeck-us.net> Acked-by: Mike Turquette <mturquette@linaro.org>
2014-04-30 23:46:29 +08:00
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);
}
core_initcall(vexpress_sysreg_init);