diff options
Diffstat (limited to 'kernel/arch/arm/mach-vt8500/vt8500.c')
| -rw-r--r-- | kernel/arch/arm/mach-vt8500/vt8500.c | 180 |
1 files changed, 180 insertions, 0 deletions
diff --git a/kernel/arch/arm/mach-vt8500/vt8500.c b/kernel/arch/arm/mach-vt8500/vt8500.c new file mode 100644 index 000000000..3bc0dc9a4 --- /dev/null +++ b/kernel/arch/arm/mach-vt8500/vt8500.c @@ -0,0 +1,180 @@ +/* + * arch/arm/mach-vt8500/vt8500.c + * + * Copyright (C) 2012 Tony Prisk <linux@prisktech.co.nz> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * 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. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include <linux/io.h> +#include <linux/pm.h> +#include <linux/reboot.h> + +#include <asm/mach-types.h> +#include <asm/mach/arch.h> +#include <asm/mach/time.h> +#include <asm/mach/map.h> + +#include <linux/of.h> +#include <linux/of_address.h> +#include <linux/of_irq.h> +#include <linux/of_platform.h> + +#define LEGACY_GPIO_BASE 0xD8110000 +#define LEGACY_PMC_BASE 0xD8130000 + +/* Registers in GPIO Controller */ +#define VT8500_GPIO_MUX_REG 0x200 + +/* Registers in Power Management Controller */ +#define VT8500_HCR_REG 0x12 +#define VT8500_PMSR_REG 0x60 + +static void __iomem *pmc_base; + +static void vt8500_restart(enum reboot_mode mode, const char *cmd) +{ + if (pmc_base) + writel(1, pmc_base + VT8500_PMSR_REG); +} + +static struct map_desc vt8500_io_desc[] __initdata = { + /* SoC MMIO registers */ + [0] = { + .virtual = 0xf8000000, + .pfn = __phys_to_pfn(0xd8000000), + .length = 0x00390000, /* max of all chip variants */ + .type = MT_DEVICE + }, +}; + +static void __init vt8500_map_io(void) +{ + iotable_init(vt8500_io_desc, ARRAY_SIZE(vt8500_io_desc)); +} + +static void vt8500_power_off(void) +{ + local_irq_disable(); + writew(5, pmc_base + VT8500_HCR_REG); + asm("mcr p15, 0, %0, c7, c0, 4" : : "r" (0)); +} + +static void __init vt8500_init(void) +{ + struct device_node *np; +#if defined(CONFIG_FB_VT8500) || defined(CONFIG_FB_WM8505) + struct device_node *fb; + void __iomem *gpio_base; +#endif + +#ifdef CONFIG_FB_VT8500 + fb = of_find_compatible_node(NULL, NULL, "via,vt8500-fb"); + if (fb) { + np = of_find_compatible_node(NULL, NULL, "via,vt8500-gpio"); + if (np) { + gpio_base = of_iomap(np, 0); + + if (!gpio_base) + pr_err("%s: of_iomap(gpio_mux) failed\n", + __func__); + + of_node_put(np); + } else { + gpio_base = ioremap(LEGACY_GPIO_BASE, 0x1000); + if (!gpio_base) + pr_err("%s: ioremap(legacy_gpio_mux) failed\n", + __func__); + } + if (gpio_base) { + writel(readl(gpio_base + VT8500_GPIO_MUX_REG) | 1, + gpio_base + VT8500_GPIO_MUX_REG); + iounmap(gpio_base); + } else + pr_err("%s: Could not remap GPIO mux\n", __func__); + + of_node_put(fb); + } +#endif + +#ifdef CONFIG_FB_WM8505 + fb = of_find_compatible_node(NULL, NULL, "wm,wm8505-fb"); + if (fb) { + np = of_find_compatible_node(NULL, NULL, "wm,wm8505-gpio"); + if (!np) + np = of_find_compatible_node(NULL, NULL, + "wm,wm8650-gpio"); + if (np) { + gpio_base = of_iomap(np, 0); + + if (!gpio_base) + pr_err("%s: of_iomap(gpio_mux) failed\n", + __func__); + + of_node_put(np); + } else { + gpio_base = ioremap(LEGACY_GPIO_BASE, 0x1000); + if (!gpio_base) + pr_err("%s: ioremap(legacy_gpio_mux) failed\n", + __func__); + } + if (gpio_base) { + writel(readl(gpio_base + VT8500_GPIO_MUX_REG) | + 0x80000000, gpio_base + VT8500_GPIO_MUX_REG); + iounmap(gpio_base); + } else + pr_err("%s: Could not remap GPIO mux\n", __func__); + + of_node_put(fb); + } +#endif + + np = of_find_compatible_node(NULL, NULL, "via,vt8500-pmc"); + if (np) { + pmc_base = of_iomap(np, 0); + + if (!pmc_base) + pr_err("%s:of_iomap(pmc) failed\n", __func__); + + of_node_put(np); + } else { + pmc_base = ioremap(LEGACY_PMC_BASE, 0x1000); + if (!pmc_base) + pr_err("%s:ioremap(power_off) failed\n", __func__); + } + if (pmc_base) + pm_power_off = &vt8500_power_off; + else + pr_err("%s: PMC Hibernation register could not be remapped, not enabling power off!\n", __func__); + + of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL); +} + +static const char * const vt8500_dt_compat[] = { + "via,vt8500", + "wm,wm8650", + "wm,wm8505", + "wm,wm8750", + "wm,wm8850", + NULL +}; + +DT_MACHINE_START(WMT_DT, "VIA/Wondermedia SoC (Device Tree Support)") + .dt_compat = vt8500_dt_compat, + .map_io = vt8500_map_io, + .init_machine = vt8500_init, + .restart = vt8500_restart, +MACHINE_END + |