1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * ARTPEC-6 device support.
4 */
5
6 #include <linux/amba/bus.h>
7 #include <linux/clocksource.h>
8 #include <linux/dma-mapping.h>
9 #include <linux/io.h>
10 #include <linux/irqchip.h>
11 #include <linux/irqchip/arm-gic.h>
12 #include <linux/mfd/syscon.h>
13 #include <linux/of.h>
14 #include <linux/of_address.h>
15 #include <linux/clk-provider.h>
16 #include <linux/regmap.h>
17 #include <linux/smp.h>
18 #include <asm/smp_scu.h>
19 #include <asm/mach/arch.h>
20 #include <asm/mach/map.h>
21 #include <asm/psci.h>
22 #include <linux/arm-smccc.h>
23
24
25 #define ARTPEC6_DMACFG_REGNUM 0x10
26 #define ARTPEC6_DMACFG_UARTS_BURST 0xff
27
28 #define SECURE_OP_L2C_WRITEREG 0xb4000001
29
30 static void __init artpec6_init_machine(void)
31 {
32 struct regmap *regmap;
33
34 regmap = syscon_regmap_lookup_by_compatible("axis,artpec6-syscon");
35
36 if (!IS_ERR(regmap)) {
37 /* Use PL011 DMA Burst Request signal instead of DMA
38 * Single Request
39 */
40 regmap_write(regmap, ARTPEC6_DMACFG_REGNUM,
41 ARTPEC6_DMACFG_UARTS_BURST);
42 };
43 }
44
45 static void artpec6_l2c310_write_sec(unsigned long val, unsigned reg)
46 {
47 struct arm_smccc_res res;
48
49 arm_smccc_smc(SECURE_OP_L2C_WRITEREG, reg, val, 0,
50 0, 0, 0, 0, &res);
51
52 WARN_ON(res.a0);
53 }
54
55 static const char * const artpec6_dt_match[] = {
56 "axis,artpec6",
57 NULL
58 };
59
60 DT_MACHINE_START(ARTPEC6, "Axis ARTPEC-6 Platform")
61 .l2c_aux_val = 0x0C000000,
62 .l2c_aux_mask = 0xF3FFFFFF,
63 .l2c_write_sec = artpec6_l2c310_write_sec,
64 .init_machine = artpec6_init_machine,
65 .dt_compat = artpec6_dt_match,
66 MACHINE_END
67
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