1// SPDX-License-Identifier: GPL-2.0+ 2/* 3 * (C) Copyright 2022 Advanced Micro Devices, Inc 4 * Michal Simek <michal.simek@amd.com> 5 * 6 * (C) Copyright 2007 Michal Simek 7 * Michal SIMEK <monstr@monstr.eu> 8 */ 9 10#include <dm.h> 11#include <timer.h> 12#include <regmap.h> 13#include <dm/device_compat.h> 14 15#define TIMER_ENABLE_ALL 0x400 /* ENALL */ 16#define TIMER_PWM 0x200 /* PWMA0 */ 17#define TIMER_INTERRUPT 0x100 /* T0INT */ 18#define TIMER_ENABLE 0x080 /* ENT0 */ 19#define TIMER_ENABLE_INTR 0x040 /* ENIT0 */ 20#define TIMER_RESET 0x020 /* LOAD0 */ 21#define TIMER_RELOAD 0x010 /* ARHT0 */ 22#define TIMER_EXT_CAPTURE 0x008 /* CAPT0 */ 23#define TIMER_EXT_COMPARE 0x004 /* GENT0 */ 24#define TIMER_DOWN_COUNT 0x002 /* UDT0 */ 25#define TIMER_CAPTURE_MODE 0x001 /* MDT0 */ 26 27#define TIMER_CONTROL_OFFSET 0 28#define TIMER_LOADREG_OFFSET 4 29#define TIMER_COUNTER_OFFSET 8 30 31struct xilinx_timer_priv { 32 struct regmap *regs; 33}; 34 35static u64 xilinx_timer_get_count(struct udevice *dev) 36{ 37 struct xilinx_timer_priv *priv = dev_get_priv(dev); 38 u32 value; 39 40 regmap_read(priv->regs, TIMER_COUNTER_OFFSET, &value); 41 42 return timer_conv_64(value); 43} 44 45static int xilinx_timer_probe(struct udevice *dev) 46{ 47 struct xilinx_timer_priv *priv = dev_get_priv(dev); 48 int ret; 49 50 /* uc_priv->clock_rate has already clock rate */ 51 ret = regmap_init_mem(dev_ofnode(dev), &priv->regs); 52 if (ret) { 53 dev_dbg(dev, "failed to get regbase of timer\n"); 54 return ret; 55 } 56 57 regmap_write(priv->regs, TIMER_LOADREG_OFFSET, 0); 58 regmap_write(priv->regs, TIMER_CONTROL_OFFSET, TIMER_RESET); 59 regmap_write(priv->regs, TIMER_CONTROL_OFFSET, 60 TIMER_ENABLE | TIMER_RELOAD); 61 62 return 0; 63} 64 65static const struct timer_ops xilinx_timer_ops = { 66 .get_count = xilinx_timer_get_count, 67}; 68 69static const struct udevice_id xilinx_timer_ids[] = { 70 { .compatible = "xlnx,xps-timer-1.00.a" }, 71 {} 72}; 73 74U_BOOT_DRIVER(xilinx_timer) = { 75 .name = "xilinx_timer", 76 .id = UCLASS_TIMER, 77 .of_match = xilinx_timer_ids, 78 .priv_auto = sizeof(struct xilinx_timer_priv), 79 .probe = xilinx_timer_probe, 80 .ops = &xilinx_timer_ops, 81}; 82