2 * R-Car Generation 2 support
4 * Copyright (C) 2013 Renesas Solutions Corp.
5 * Copyright (C) 2013 Magnus Damm
6 * Copyright (C) 2014 Ulrich Hecht
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; version 2 of the License.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
18 #include <linux/clk-provider.h>
19 #include <linux/clocksource.h>
20 #include <linux/device.h>
21 #include <linux/dma-contiguous.h>
23 #include <linux/kernel.h>
24 #include <linux/memblock.h>
26 #include <linux/of_fdt.h>
27 #include <asm/mach/arch.h>
29 #include "rcar-gen2.h"
31 #define MODEMR 0xe6160060
33 u32 rcar_gen2_read_mode_pins(void)
36 static bool mode_valid;
39 void __iomem *modemr = ioremap_nocache(MODEMR, 4);
41 mode = ioread32(modemr);
49 static unsigned int __init get_extal_freq(void)
51 struct device_node *cpg, *extal;
54 cpg = of_find_compatible_node(NULL, NULL,
55 "renesas,rcar-gen2-cpg-clocks");
59 extal = of_parse_phandle(cpg, "clocks", 0);
64 of_property_read_u32(extal, "clock-frequency", &freq);
72 void __init rcar_gen2_timer_init(void)
74 #ifdef CONFIG_ARM_ARCH_TIMER
78 if (of_machine_is_compatible("renesas,r8a7792") ||
79 of_machine_is_compatible("renesas,r8a7794")) {
80 freq = 260000000 / 8; /* ZS / 8 */
81 /* CNTVOFF has to be initialized either from non-secure
82 * Hypervisor mode or secure Monitor mode with SCR.NS==1.
83 * If TrustZone is enabled then it should be handled by the
88 " mrc p15, 0, r1, c1, c1, 0\n"
90 " mcr p15, 0, r0, c1, c1, 0\n"
93 " mcrr p15, 4, r0, r0, c14\n"
95 " mcr p15, 0, r1, c1, c1, 0\n"
100 /* At Linux boot time the r8a7790 arch timer comes up
101 * with the counter disabled. Moreover, it may also report
102 * a potentially incorrect fixed 13 MHz frequency. To be
103 * correct these registers need to be updated to use the
104 * frequency EXTAL / 2.
106 freq = get_extal_freq() / 2;
109 /* Remap "armgcnt address map" space */
110 base = ioremap(0xe6080000, PAGE_SIZE);
113 * Update the timer if it is either not running, or is not at the
114 * right frequency. The timer is only configurable in secure mode
115 * so this avoids an abort if the loader started the timer and
116 * entered the kernel in non-secure mode.
119 if ((ioread32(base + CNTCR) & 1) == 0 ||
120 ioread32(base + CNTFID0) != freq) {
121 /* Update registers with correct frequency */
122 iowrite32(freq, base + CNTFID0);
123 asm volatile("mcr p15, 0, %0, c14, c0, 0" : : "r" (freq));
125 /* make sure arch timer is started by setting bit 0 of CNTCR */
126 iowrite32(1, base + CNTCR);
130 #endif /* CONFIG_ARM_ARCH_TIMER */
136 struct memory_reserve_config {
141 static int __init rcar_gen2_scan_mem(unsigned long node, const char *uname,
142 int depth, void *data)
144 const char *type = of_get_flat_dt_prop(node, "device_type", NULL);
145 const __be32 *reg, *endp;
147 struct memory_reserve_config *mrc = data;
148 u64 lpae_start = 1ULL << 32;
150 /* We are scanning "memory" nodes only */
151 if (type == NULL || strcmp(type, "memory"))
154 reg = of_get_flat_dt_prop(node, "linux,usable-memory", &l);
156 reg = of_get_flat_dt_prop(node, "reg", &l);
160 endp = reg + (l / sizeof(__be32));
161 while ((endp - reg) >= (dt_root_addr_cells + dt_root_size_cells)) {
164 base = dt_mem_next_cell(dt_root_addr_cells, ®);
165 size = dt_mem_next_cell(dt_root_size_cells, ®);
167 if (base >= lpae_start)
170 if ((base + size) >= lpae_start)
171 size = lpae_start - base;
173 if (size < mrc->reserved)
176 if (base < mrc->base)
179 /* keep the area at top near the 32-bit legacy limit */
180 mrc->base = base + size - mrc->reserved;
181 mrc->size = mrc->reserved;
187 void __init rcar_gen2_reserve(void)
189 struct memory_reserve_config mrc;
191 /* reserve 256 MiB at the top of the physical legacy 32-bit space */
192 memset(&mrc, 0, sizeof(mrc));
193 mrc.reserved = SZ_256M;
195 of_scan_flat_dt(rcar_gen2_scan_mem, &mrc);
196 #ifdef CONFIG_DMA_CMA
197 if (mrc.size && memblock_is_region_memory(mrc.base, mrc.size)) {
198 static struct cma *rcar_gen2_dma_contiguous;
200 dma_contiguous_reserve_area(mrc.size, mrc.base, 0,
201 &rcar_gen2_dma_contiguous, true);