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