atcpit100_timer.c
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/*
* Andestech ATCPIT100 timer driver
*
* (C) Copyright 2016
* Rick Chen, NDS32 Software Engineering, rick@andestech.com
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <dm.h>
#include <errno.h>
#include <timer.h>
#include <linux/io.h>
DECLARE_GLOBAL_DATA_PTR;
#define REG32_TMR(x) (*(u32 *) ((plat->regs) + (x>>2)))
/*
* Definition of register offsets
*/
/* ID and Revision Register */
#define ID_REV 0x0
/* Configuration Register */
#define CFG 0x10
/* Interrupt Enable Register */
#define INT_EN 0x14
#define CH_INT_EN(c , i) ((1<<i)<<(4*c))
/* Interrupt Status Register */
#define INT_STA 0x18
#define CH_INT_STA(c , i) ((1<<i)<<(4*c))
/* Channel Enable Register */
#define CH_EN 0x1C
#define CH_TMR_EN(c , t) ((1<<t)<<(4*c))
/* Ch n Control REgister */
#define CH_CTL(n) (0x20+0x10*n)
/* Channel clock source , bit 3 , 0:External clock , 1:APB clock */
#define APB_CLK (1<<3)
/* Channel mode , bit 0~2 */
#define TMR_32 1
#define TMR_16 2
#define TMR_8 3
#define PWM 4
#define CH_REL(n) (0x24+0x10*n)
#define CH_CNT(n) (0x28+0x10*n)
struct atctmr_timer_regs {
u32 id_rev; /* 0x00 */
u32 reservd[3]; /* 0x04 ~ 0x0c */
u32 cfg; /* 0x10 */
u32 int_en; /* 0x14 */
u32 int_st; /* 0x18 */
u32 ch_en; /* 0x1c */
u32 ch0_ctrl; /* 0x20 */
u32 ch0_reload; /* 0x24 */
u32 ch0_cntr; /* 0x28 */
u32 reservd1; /* 0x2c */
u32 ch1_ctrl; /* 0x30 */
u32 ch1_reload; /* 0x34 */
u32 int_mask; /* 0x38 */
};
struct atcpit_timer_platdata {
u32 *regs;
};
static int atcpit_timer_get_count(struct udevice *dev, u64 *count)
{
struct atcpit_timer_platdata *plat = dev_get_platdata(dev);
u32 val;
val = ~(REG32_TMR(CH_CNT(1))+0xffffffff);
*count = timer_conv_64(val);
return 0;
}
static int atcpit_timer_probe(struct udevice *dev)
{
struct atcpit_timer_platdata *plat = dev_get_platdata(dev);
REG32_TMR(CH_REL(1)) = 0xffffffff;
REG32_TMR(CH_CTL(1)) = APB_CLK|TMR_32;
REG32_TMR(CH_EN) |= CH_TMR_EN(1 , 0);
return 0;
}
static int atcpit_timer_ofdata_to_platdata(struct udevice *dev)
{
struct atcpit_timer_platdata *plat = dev_get_platdata(dev);
plat->regs = map_physmem(devfdt_get_addr(dev) , 0x100 , MAP_NOCACHE);
return 0;
}
static const struct timer_ops atcpit_timer_ops = {
.get_count = atcpit_timer_get_count,
};
static const struct udevice_id atcpit_timer_ids[] = {
{ .compatible = "andestech,atcpit100" },
{}
};
U_BOOT_DRIVER(atcpit100_timer) = {
.name = "atcpit100_timer",
.id = UCLASS_TIMER,
.of_match = atcpit_timer_ids,
.ofdata_to_platdata = atcpit_timer_ofdata_to_platdata,
.platdata_auto_alloc_size = sizeof(struct atcpit_timer_platdata),
.probe = atcpit_timer_probe,
.ops = &atcpit_timer_ops,
.flags = DM_FLAG_PRE_RELOC,
};