1 /* 2 * ARTPEC-6 device support. 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License version 2 as 6 * published by the Free Software Foundation. 7 */ 8 9 #include <linux/amba/bus.h> 10 #include <linux/clocksource.h> 11 #include <linux/dma-mapping.h> 12 #include <linux/io.h> 13 #include <linux/irqchip.h> 14 #include <linux/irqchip/arm-gic.h> 15 #include <linux/mfd/syscon.h> 16 #include <linux/of_platform.h> 17 #include <linux/of.h> 18 #include <linux/of_address.h> 19 #include <linux/clk-provider.h> 20 #include <linux/regmap.h> 21 #include <linux/smp.h> 22 #include <asm/smp_scu.h> 23 #include <asm/mach/arch.h> 24 #include <asm/mach/map.h> 25 #include <asm/psci.h> 26 #include <linux/arm-smccc.h> 27 28 29 #define ARTPEC6_DMACFG_REGNUM 0x10 30 #define ARTPEC6_DMACFG_UARTS_BURST 0xff 31 32 #define SECURE_OP_L2C_WRITEREG 0xb4000001 33 34 static void __init artpec6_init_machine(void) 35 { 36 struct regmap *regmap; 37 38 regmap = syscon_regmap_lookup_by_compatible("axis,artpec6-syscon"); 39 40 if (!IS_ERR(regmap)) { 41 /* Use PL011 DMA Burst Request signal instead of DMA 42 * Single Request 43 */ 44 regmap_write(regmap, ARTPEC6_DMACFG_REGNUM, 45 ARTPEC6_DMACFG_UARTS_BURST); 46 }; 47 48 of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL); 49 } 50 51 static void artpec6_l2c310_write_sec(unsigned long val, unsigned reg) 52 { 53 struct arm_smccc_res res; 54 55 arm_smccc_smc(SECURE_OP_L2C_WRITEREG, reg, val, 0, 56 0, 0, 0, 0, &res); 57 58 WARN_ON(res.a0); 59 } 60 61 static const char * const artpec6_dt_match[] = { 62 "axis,artpec6", 63 NULL 64 }; 65 66 DT_MACHINE_START(ARTPEC6, "Axis ARTPEC-6 Platform") 67 .l2c_aux_val = 0x0C000000, 68 .l2c_aux_mask = 0xF3FFFFFF, 69 .l2c_write_sec = artpec6_l2c310_write_sec, 70 .init_machine = artpec6_init_machine, 71 .dt_compat = artpec6_dt_match, 72 MACHINE_END 73