236 lines
6.2 KiB
C
236 lines
6.2 KiB
C
/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* Copyright (C) 2012 ARM Limited
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*/
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#include <linux/gpio/driver.h>
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#include <linux/err.h>
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#include <linux/io.h>
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#include <linux/mfd/core.h>
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#include <linux/of_address.h>
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#include <linux/of_platform.h>
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#include <linux/platform_data/syscon.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/stat.h>
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#include <linux/vexpress.h>
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#define SYS_ID 0x000
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#define SYS_SW 0x004
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#define SYS_LED 0x008
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#define SYS_100HZ 0x024
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#define SYS_FLAGSSET 0x030
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#define SYS_FLAGSCLR 0x034
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#define SYS_NVFLAGS 0x038
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#define SYS_NVFLAGSSET 0x038
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#define SYS_NVFLAGSCLR 0x03c
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#define SYS_MCI 0x048
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#define SYS_FLASH 0x04c
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#define SYS_CFGSW 0x058
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#define SYS_24MHZ 0x05c
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#define SYS_MISC 0x060
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#define SYS_DMA 0x064
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#define SYS_PROCID0 0x084
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#define SYS_PROCID1 0x088
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#define SYS_CFGDATA 0x0a0
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#define SYS_CFGCTRL 0x0a4
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#define SYS_CFGSTAT 0x0a8
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#define SYS_HBI_MASK 0xfff
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#define SYS_PROCIDx_HBI_SHIFT 0
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#define SYS_MISC_MASTERSITE (1 << 14)
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void vexpress_flags_set(u32 data)
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{
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static void __iomem *base;
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if (!base) {
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struct device_node *node = of_find_compatible_node(NULL, NULL,
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"arm,vexpress-sysreg");
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base = of_iomap(node, 0);
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}
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if (WARN_ON(!base))
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return;
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writel(~0, base + SYS_FLAGSCLR);
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writel(data, base + SYS_FLAGSSET);
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}
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/* The sysreg block is just a random collection of various functions... */
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static struct syscon_platform_data vexpress_sysreg_sys_id_pdata = {
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.label = "sys_id",
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};
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static struct bgpio_pdata vexpress_sysreg_sys_led_pdata = {
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.label = "sys_led",
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.base = -1,
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.ngpio = 8,
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};
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static struct bgpio_pdata vexpress_sysreg_sys_mci_pdata = {
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.label = "sys_mci",
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.base = -1,
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.ngpio = 2,
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};
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static struct bgpio_pdata vexpress_sysreg_sys_flash_pdata = {
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.label = "sys_flash",
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.base = -1,
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.ngpio = 1,
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};
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static struct syscon_platform_data vexpress_sysreg_sys_misc_pdata = {
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.label = "sys_misc",
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};
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static struct syscon_platform_data vexpress_sysreg_sys_procid_pdata = {
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.label = "sys_procid",
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};
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static struct mfd_cell vexpress_sysreg_cells[] = {
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{
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.name = "syscon",
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.num_resources = 1,
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.resources = (struct resource []) {
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DEFINE_RES_MEM(SYS_ID, 0x4),
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},
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.platform_data = &vexpress_sysreg_sys_id_pdata,
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.pdata_size = sizeof(vexpress_sysreg_sys_id_pdata),
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}, {
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.name = "basic-mmio-gpio",
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.of_compatible = "arm,vexpress-sysreg,sys_led",
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.num_resources = 1,
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.resources = (struct resource []) {
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DEFINE_RES_MEM_NAMED(SYS_LED, 0x4, "dat"),
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},
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.platform_data = &vexpress_sysreg_sys_led_pdata,
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.pdata_size = sizeof(vexpress_sysreg_sys_led_pdata),
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}, {
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.name = "basic-mmio-gpio",
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.of_compatible = "arm,vexpress-sysreg,sys_mci",
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.num_resources = 1,
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.resources = (struct resource []) {
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DEFINE_RES_MEM_NAMED(SYS_MCI, 0x4, "dat"),
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},
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.platform_data = &vexpress_sysreg_sys_mci_pdata,
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.pdata_size = sizeof(vexpress_sysreg_sys_mci_pdata),
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}, {
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.name = "basic-mmio-gpio",
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.of_compatible = "arm,vexpress-sysreg,sys_flash",
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.num_resources = 1,
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.resources = (struct resource []) {
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DEFINE_RES_MEM_NAMED(SYS_FLASH, 0x4, "dat"),
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},
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.platform_data = &vexpress_sysreg_sys_flash_pdata,
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.pdata_size = sizeof(vexpress_sysreg_sys_flash_pdata),
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}, {
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.name = "syscon",
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.num_resources = 1,
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.resources = (struct resource []) {
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DEFINE_RES_MEM(SYS_MISC, 0x4),
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},
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.platform_data = &vexpress_sysreg_sys_misc_pdata,
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.pdata_size = sizeof(vexpress_sysreg_sys_misc_pdata),
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}, {
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.name = "syscon",
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.num_resources = 1,
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.resources = (struct resource []) {
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DEFINE_RES_MEM(SYS_PROCID0, 0x8),
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},
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.platform_data = &vexpress_sysreg_sys_procid_pdata,
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.pdata_size = sizeof(vexpress_sysreg_sys_procid_pdata),
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}, {
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.name = "vexpress-syscfg",
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.num_resources = 1,
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.resources = (struct resource []) {
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DEFINE_RES_MEM(SYS_CFGDATA, 0xc),
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},
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}
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};
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static int vexpress_sysreg_probe(struct platform_device *pdev)
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{
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struct resource *mem;
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void __iomem *base;
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struct gpio_chip *mmc_gpio_chip;
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int master;
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u32 dt_hbi;
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mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!mem)
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return -EINVAL;
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base = devm_ioremap(&pdev->dev, mem->start, resource_size(mem));
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if (!base)
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return -ENOMEM;
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master = readl(base + SYS_MISC) & SYS_MISC_MASTERSITE ?
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VEXPRESS_SITE_DB2 : VEXPRESS_SITE_DB1;
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vexpress_config_set_master(master);
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/* Confirm board type against DT property, if available */
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if (of_property_read_u32(of_root, "arm,hbi", &dt_hbi) == 0) {
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u32 id = readl(base + (master == VEXPRESS_SITE_DB1 ?
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SYS_PROCID0 : SYS_PROCID1));
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u32 hbi = (id >> SYS_PROCIDx_HBI_SHIFT) & SYS_HBI_MASK;
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if (WARN_ON(dt_hbi != hbi))
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dev_warn(&pdev->dev, "DT HBI (%x) is not matching hardware (%x)!\n",
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dt_hbi, hbi);
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}
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/*
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* Duplicated SYS_MCI pseudo-GPIO controller for compatibility with
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* older trees using sysreg node for MMC control lines.
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*/
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mmc_gpio_chip = devm_kzalloc(&pdev->dev, sizeof(*mmc_gpio_chip),
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GFP_KERNEL);
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if (!mmc_gpio_chip)
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return -ENOMEM;
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bgpio_init(mmc_gpio_chip, &pdev->dev, 0x4, base + SYS_MCI,
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NULL, NULL, NULL, NULL, 0);
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mmc_gpio_chip->ngpio = 2;
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gpiochip_add_data(mmc_gpio_chip, NULL);
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return mfd_add_devices(&pdev->dev, PLATFORM_DEVID_AUTO,
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vexpress_sysreg_cells,
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ARRAY_SIZE(vexpress_sysreg_cells), mem, 0, NULL);
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}
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static const struct of_device_id vexpress_sysreg_match[] = {
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{ .compatible = "arm,vexpress-sysreg", },
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{},
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};
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static struct platform_driver vexpress_sysreg_driver = {
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.driver = {
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.name = "vexpress-sysreg",
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.of_match_table = vexpress_sysreg_match,
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},
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.probe = vexpress_sysreg_probe,
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};
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static int __init vexpress_sysreg_init(void)
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{
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struct device_node *node;
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/* Need the sysreg early, before any other device... */
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for_each_matching_node(node, vexpress_sysreg_match)
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of_platform_device_create(node, NULL, NULL);
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return platform_driver_register(&vexpress_sysreg_driver);
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}
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core_initcall(vexpress_sysreg_init);
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