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164 lines
3.7 KiB
164 lines
3.7 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* arch/arm/mach-vt8500/vt8500.c |
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* |
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* Copyright (C) 2012 Tony Prisk <[email protected]> |
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*/ |
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#include <linux/io.h> |
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#include <linux/pm.h> |
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#include <linux/reboot.h> |
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#include <asm/mach-types.h> |
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#include <asm/mach/arch.h> |
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#include <asm/mach/time.h> |
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#include <asm/mach/map.h> |
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#include <linux/of.h> |
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#include <linux/of_address.h> |
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#include <linux/of_irq.h> |
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#define LEGACY_GPIO_BASE 0xD8110000 |
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#define LEGACY_PMC_BASE 0xD8130000 |
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/* Registers in GPIO Controller */ |
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#define VT8500_GPIO_MUX_REG 0x200 |
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/* Registers in Power Management Controller */ |
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#define VT8500_HCR_REG 0x12 |
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#define VT8500_PMSR_REG 0x60 |
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static void __iomem *pmc_base; |
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static void vt8500_restart(enum reboot_mode mode, const char *cmd) |
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{ |
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if (pmc_base) |
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writel(1, pmc_base + VT8500_PMSR_REG); |
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} |
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static struct map_desc vt8500_io_desc[] __initdata = { |
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/* SoC MMIO registers */ |
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[0] = { |
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.virtual = 0xf8000000, |
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.pfn = __phys_to_pfn(0xd8000000), |
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.length = 0x00390000, /* max of all chip variants */ |
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.type = MT_DEVICE |
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}, |
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}; |
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static void __init vt8500_map_io(void) |
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{ |
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iotable_init(vt8500_io_desc, ARRAY_SIZE(vt8500_io_desc)); |
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} |
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static void vt8500_power_off(void) |
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{ |
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local_irq_disable(); |
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writew(5, pmc_base + VT8500_HCR_REG); |
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asm("mcr p15, 0, %0, c7, c0, 4" : : "r" (0)); |
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} |
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static void __init vt8500_init(void) |
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{ |
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struct device_node *np; |
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#if defined(CONFIG_FB_VT8500) || defined(CONFIG_FB_WM8505) |
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struct device_node *fb; |
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void __iomem *gpio_base; |
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#endif |
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#ifdef CONFIG_FB_VT8500 |
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fb = of_find_compatible_node(NULL, NULL, "via,vt8500-fb"); |
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if (fb) { |
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np = of_find_compatible_node(NULL, NULL, "via,vt8500-gpio"); |
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if (np) { |
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gpio_base = of_iomap(np, 0); |
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if (!gpio_base) |
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pr_err("%s: of_iomap(gpio_mux) failed\n", |
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__func__); |
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of_node_put(np); |
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} else { |
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gpio_base = ioremap(LEGACY_GPIO_BASE, 0x1000); |
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if (!gpio_base) |
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pr_err("%s: ioremap(legacy_gpio_mux) failed\n", |
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__func__); |
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} |
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if (gpio_base) { |
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writel(readl(gpio_base + VT8500_GPIO_MUX_REG) | 1, |
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gpio_base + VT8500_GPIO_MUX_REG); |
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iounmap(gpio_base); |
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} else |
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pr_err("%s: Could not remap GPIO mux\n", __func__); |
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of_node_put(fb); |
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} |
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#endif |
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#ifdef CONFIG_FB_WM8505 |
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fb = of_find_compatible_node(NULL, NULL, "wm,wm8505-fb"); |
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if (fb) { |
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np = of_find_compatible_node(NULL, NULL, "wm,wm8505-gpio"); |
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if (!np) |
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np = of_find_compatible_node(NULL, NULL, |
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"wm,wm8650-gpio"); |
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if (np) { |
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gpio_base = of_iomap(np, 0); |
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if (!gpio_base) |
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pr_err("%s: of_iomap(gpio_mux) failed\n", |
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__func__); |
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of_node_put(np); |
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} else { |
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gpio_base = ioremap(LEGACY_GPIO_BASE, 0x1000); |
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if (!gpio_base) |
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pr_err("%s: ioremap(legacy_gpio_mux) failed\n", |
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__func__); |
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} |
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if (gpio_base) { |
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writel(readl(gpio_base + VT8500_GPIO_MUX_REG) | |
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0x80000000, gpio_base + VT8500_GPIO_MUX_REG); |
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iounmap(gpio_base); |
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} else |
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pr_err("%s: Could not remap GPIO mux\n", __func__); |
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of_node_put(fb); |
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} |
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#endif |
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np = of_find_compatible_node(NULL, NULL, "via,vt8500-pmc"); |
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if (np) { |
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pmc_base = of_iomap(np, 0); |
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if (!pmc_base) |
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pr_err("%s:of_iomap(pmc) failed\n", __func__); |
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of_node_put(np); |
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} else { |
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pmc_base = ioremap(LEGACY_PMC_BASE, 0x1000); |
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if (!pmc_base) |
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pr_err("%s:ioremap(power_off) failed\n", __func__); |
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} |
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if (pmc_base) |
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pm_power_off = &vt8500_power_off; |
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else |
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pr_err("%s: PMC Hibernation register could not be remapped, not enabling power off!\n", __func__); |
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} |
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static const char * const vt8500_dt_compat[] = { |
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"via,vt8500", |
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"wm,wm8650", |
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"wm,wm8505", |
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"wm,wm8750", |
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"wm,wm8850", |
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NULL |
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}; |
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DT_MACHINE_START(WMT_DT, "VIA/Wondermedia SoC (Device Tree Support)") |
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.dt_compat = vt8500_dt_compat, |
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.map_io = vt8500_map_io, |
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.init_machine = vt8500_init, |
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.restart = vt8500_restart, |
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MACHINE_END |
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