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Diffstat (limited to 'arch/arm/mach-imx/src.c')
| -rw-r--r-- | arch/arm/mach-imx/src.c | 142 |
1 files changed, 142 insertions, 0 deletions
diff --git a/arch/arm/mach-imx/src.c b/arch/arm/mach-imx/src.c new file mode 100644 index 000000000..495d85d0f --- /dev/null +++ b/arch/arm/mach-imx/src.c @@ -0,0 +1,142 @@ +/* + * Copyright 2011 Freescale Semiconductor, Inc. + * Copyright 2011 Linaro Ltd. + * + * The code contained herein is licensed under the GNU General Public + * License. You may obtain a copy of the GNU General Public License + * Version 2 or later at the following locations: + * + * http://www.opensource.org/licenses/gpl-license.html + * http://www.gnu.org/copyleft/gpl.html + */ + +#include <linux/init.h> +#include <linux/io.h> +#include <linux/of.h> +#include <linux/of_address.h> +#include <linux/reset-controller.h> +#include <linux/smp.h> +#include <asm/smp_plat.h> +#include "common.h" + +#define SRC_SCR 0x000 +#define SRC_GPR1 0x020 +#define BP_SRC_SCR_WARM_RESET_ENABLE 0 +#define BP_SRC_SCR_SW_GPU_RST 1 +#define BP_SRC_SCR_SW_VPU_RST 2 +#define BP_SRC_SCR_SW_IPU1_RST 3 +#define BP_SRC_SCR_SW_OPEN_VG_RST 4 +#define BP_SRC_SCR_SW_IPU2_RST 12 +#define BP_SRC_SCR_CORE1_RST 14 +#define BP_SRC_SCR_CORE1_ENABLE 22 + +static void __iomem *src_base; +static DEFINE_SPINLOCK(scr_lock); + +static const int sw_reset_bits[5] = { + BP_SRC_SCR_SW_GPU_RST, + BP_SRC_SCR_SW_VPU_RST, + BP_SRC_SCR_SW_IPU1_RST, + BP_SRC_SCR_SW_OPEN_VG_RST, + BP_SRC_SCR_SW_IPU2_RST +}; + +static int imx_src_reset_module(struct reset_controller_dev *rcdev, + unsigned long sw_reset_idx) +{ + unsigned long timeout; + unsigned long flags; + int bit; + u32 val; + + if (!src_base) + return -ENODEV; + + if (sw_reset_idx >= ARRAY_SIZE(sw_reset_bits)) + return -EINVAL; + + bit = 1 << sw_reset_bits[sw_reset_idx]; + + spin_lock_irqsave(&scr_lock, flags); + val = readl_relaxed(src_base + SRC_SCR); + val |= bit; + writel_relaxed(val, src_base + SRC_SCR); + spin_unlock_irqrestore(&scr_lock, flags); + + timeout = jiffies + msecs_to_jiffies(1000); + while (readl(src_base + SRC_SCR) & bit) { + if (time_after(jiffies, timeout)) + return -ETIME; + cpu_relax(); + } + + return 0; +} + +static const struct reset_control_ops imx_src_ops = { + .reset = imx_src_reset_module, +}; + +static struct reset_controller_dev imx_reset_controller = { + .ops = &imx_src_ops, + .nr_resets = ARRAY_SIZE(sw_reset_bits), +}; + +void imx_enable_cpu(int cpu, bool enable) +{ + u32 mask, val; + + cpu = cpu_logical_map(cpu); + mask = 1 << (BP_SRC_SCR_CORE1_ENABLE + cpu - 1); + spin_lock(&scr_lock); + val = readl_relaxed(src_base + SRC_SCR); + val = enable ? val | mask : val & ~mask; + val |= 1 << (BP_SRC_SCR_CORE1_RST + cpu - 1); + writel_relaxed(val, src_base + SRC_SCR); + spin_unlock(&scr_lock); +} + +void imx_set_cpu_jump(int cpu, void *jump_addr) +{ + cpu = cpu_logical_map(cpu); + writel_relaxed(__pa_symbol(jump_addr), + src_base + SRC_GPR1 + cpu * 8); +} + +u32 imx_get_cpu_arg(int cpu) +{ + cpu = cpu_logical_map(cpu); + return readl_relaxed(src_base + SRC_GPR1 + cpu * 8 + 4); +} + +void imx_set_cpu_arg(int cpu, u32 arg) +{ + cpu = cpu_logical_map(cpu); + writel_relaxed(arg, src_base + SRC_GPR1 + cpu * 8 + 4); +} + +void __init imx_src_init(void) +{ + struct device_node *np; + u32 val; + + np = of_find_compatible_node(NULL, NULL, "fsl,imx51-src"); + if (!np) + return; + src_base = of_iomap(np, 0); + WARN_ON(!src_base); + + imx_reset_controller.of_node = np; + if (IS_ENABLED(CONFIG_RESET_CONTROLLER)) + reset_controller_register(&imx_reset_controller); + + /* + * force warm reset sources to generate cold reset + * for a more reliable restart + */ + spin_lock(&scr_lock); + val = readl_relaxed(src_base + SRC_SCR); + val &= ~(1 << BP_SRC_SCR_WARM_RESET_ENABLE); + writel_relaxed(val, src_base + SRC_SCR); + spin_unlock(&scr_lock); +} |