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.h> 17 #include <linux/of_address.h> 18 #include <linux/clk-provider.h> 19 #include <linux/regmap.h> 20 #include <linux/smp.h> 21 #include <asm/smp_scu.h> 22 #include <asm/mach/arch.h> 23 #include <asm/mach/map.h> 24 #include <asm/psci.h> 25 #include <linux/arm-smccc.h> 26 27 28 #define ARTPEC6_DMACFG_REGNUM 0x10 29 #define ARTPEC6_DMACFG_UARTS_BURST 0xff 30 31 #define SECURE_OP_L2C_WRITEREG 0xb4000001 32 33 static void __init artpec6_init_machine(void) 34 { 35 struct regmap *regmap; 36 37 regmap = syscon_regmap_lookup_by_compatible("axis,artpec6-syscon"); 38 39 if (!IS_ERR(regmap)) { 40 /* Use PL011 DMA Burst Request signal instead of DMA 41 * Single Request 42 */ 43 regmap_write(regmap, ARTPEC6_DMACFG_REGNUM, 44 ARTPEC6_DMACFG_UARTS_BURST); 45 }; 46 } 47 48 static void artpec6_l2c310_write_sec(unsigned long val, unsigned reg) 49 { 50 struct arm_smccc_res res; 51 52 arm_smccc_smc(SECURE_OP_L2C_WRITEREG, reg, val, 0, 53 0, 0, 0, 0, &res); 54 55 WARN_ON(res.a0); 56 } 57 58 static const char * const artpec6_dt_match[] = { 59 "axis,artpec6", 60 NULL 61 }; 62 63 DT_MACHINE_START(ARTPEC6, "Axis ARTPEC-6 Platform") 64 .l2c_aux_val = 0x0C000000, 65 .l2c_aux_mask = 0xF3FFFFFF, 66 .l2c_write_sec = artpec6_l2c310_write_sec, 67 .init_machine = artpec6_init_machine, 68 .dt_compat = artpec6_dt_match, 69 MACHINE_END 70