2 * Copyright 2011 Freescale Semiconductor, Inc.
3 * Copyright 2011 Linaro Ltd.
5 * The code contained herein is licensed under the GNU General Public
6 * License. You may obtain a copy of the GNU General Public License
7 * Version 2 or later at the following locations:
9 * http://www.opensource.org/licenses/gpl-license.html
10 * http://www.gnu.org/copyleft/gpl.html
13 #include <linux/init.h>
16 #include <linux/of_address.h>
17 #include <linux/reset-controller.h>
18 #include <linux/smp.h>
19 #include <asm/smp_plat.h>
22 #define SRC_GPR1 0x020
23 #define BP_SRC_SCR_WARM_RESET_ENABLE 0
24 #define BP_SRC_SCR_SW_GPU_RST 1
25 #define BP_SRC_SCR_SW_VPU_RST 2
26 #define BP_SRC_SCR_SW_IPU1_RST 3
27 #define BP_SRC_SCR_SW_OPEN_VG_RST 4
28 #define BP_SRC_SCR_SW_IPU2_RST 12
29 #define BP_SRC_SCR_CORE1_RST 14
30 #define BP_SRC_SCR_CORE1_ENABLE 22
32 static void __iomem *src_base;
33 static DEFINE_SPINLOCK(scr_lock);
35 static const int sw_reset_bits[5] = {
36 BP_SRC_SCR_SW_GPU_RST,
37 BP_SRC_SCR_SW_VPU_RST,
38 BP_SRC_SCR_SW_IPU1_RST,
39 BP_SRC_SCR_SW_OPEN_VG_RST,
40 BP_SRC_SCR_SW_IPU2_RST
43 static int imx_src_reset_module(struct reset_controller_dev *rcdev,
44 unsigned long sw_reset_idx)
46 unsigned long timeout;
54 if (sw_reset_idx >= ARRAY_SIZE(sw_reset_bits))
57 bit = 1 << sw_reset_bits[sw_reset_idx];
59 spin_lock_irqsave(&scr_lock, flags);
60 val = readl_relaxed(src_base + SRC_SCR);
62 writel_relaxed(val, src_base + SRC_SCR);
63 spin_unlock_irqrestore(&scr_lock, flags);
65 timeout = jiffies + msecs_to_jiffies(1000);
66 while (readl(src_base + SRC_SCR) & bit) {
67 if (time_after(jiffies, timeout))
75 static struct reset_control_ops imx_src_ops = {
76 .reset = imx_src_reset_module,
79 static struct reset_controller_dev imx_reset_controller = {
81 .nr_resets = ARRAY_SIZE(sw_reset_bits),
84 void imx_enable_cpu(int cpu, bool enable)
88 cpu = cpu_logical_map(cpu);
89 mask = 1 << (BP_SRC_SCR_CORE1_ENABLE + cpu - 1);
91 val = readl_relaxed(src_base + SRC_SCR);
92 val = enable ? val | mask : val & ~mask;
93 writel_relaxed(val, src_base + SRC_SCR);
94 spin_unlock(&scr_lock);
97 void imx_set_cpu_jump(int cpu, void *jump_addr)
99 cpu = cpu_logical_map(cpu);
100 writel_relaxed(virt_to_phys(jump_addr),
101 src_base + SRC_GPR1 + cpu * 8);
104 u32 imx_get_cpu_arg(int cpu)
106 cpu = cpu_logical_map(cpu);
107 return readl_relaxed(src_base + SRC_GPR1 + cpu * 8 + 4);
110 void imx_set_cpu_arg(int cpu, u32 arg)
112 cpu = cpu_logical_map(cpu);
113 writel_relaxed(arg, src_base + SRC_GPR1 + cpu * 8 + 4);
116 void imx_src_prepare_restart(void)
120 /* clear enable bits of secondary cores */
121 spin_lock(&scr_lock);
122 val = readl_relaxed(src_base + SRC_SCR);
123 val &= ~(0x7 << BP_SRC_SCR_CORE1_ENABLE);
124 writel_relaxed(val, src_base + SRC_SCR);
125 spin_unlock(&scr_lock);
127 /* clear persistent entry register of primary core */
128 writel_relaxed(0, src_base + SRC_GPR1);
131 void __init imx_src_init(void)
133 struct device_node *np;
136 np = of_find_compatible_node(NULL, NULL, "fsl,imx6q-src");
137 src_base = of_iomap(np, 0);
140 imx_reset_controller.of_node = np;
141 if (IS_ENABLED(CONFIG_RESET_CONTROLLER))
142 reset_controller_register(&imx_reset_controller);
145 * force warm reset sources to generate cold reset
146 * for a more reliable restart
148 spin_lock(&scr_lock);
149 val = readl_relaxed(src_base + SRC_SCR);
150 val &= ~(1 << BP_SRC_SCR_WARM_RESET_ENABLE);
151 writel_relaxed(val, src_base + SRC_SCR);
152 spin_unlock(&scr_lock);