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https://github.com/brain-hackers/u-boot-brain
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caa4daa2ae
We use 'priv' for private data but often use 'platdata' for platform data. We can't really use 'pdata' since that is ambiguous (it could mean private or platform data). Rename some of the latter variables to end with 'plat' for consistency. Signed-off-by: Simon Glass <sjg@chromium.org>
113 lines
2.6 KiB
C
113 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Andestech ATCPIT100 timer driver
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*
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* (C) Copyright 2016
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* Rick Chen, NDS32 Software Engineering, rick@andestech.com
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*/
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#include <common.h>
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#include <dm.h>
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#include <errno.h>
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#include <timer.h>
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#include <linux/io.h>
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#define REG32_TMR(x) (*(u32 *) ((plat->regs) + (x>>2)))
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/*
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* Definition of register offsets
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*/
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/* ID and Revision Register */
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#define ID_REV 0x0
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/* Configuration Register */
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#define CFG 0x10
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/* Interrupt Enable Register */
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#define INT_EN 0x14
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#define CH_INT_EN(c , i) ((1<<i)<<(4*c))
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/* Interrupt Status Register */
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#define INT_STA 0x18
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#define CH_INT_STA(c , i) ((1<<i)<<(4*c))
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/* Channel Enable Register */
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#define CH_EN 0x1C
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#define CH_TMR_EN(c , t) ((1<<t)<<(4*c))
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/* Ch n Control REgister */
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#define CH_CTL(n) (0x20+0x10*n)
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/* Channel clock source , bit 3 , 0:External clock , 1:APB clock */
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#define APB_CLK (1<<3)
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/* Channel mode , bit 0~2 */
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#define TMR_32 1
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#define TMR_16 2
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#define TMR_8 3
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#define PWM 4
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#define CH_REL(n) (0x24+0x10*n)
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#define CH_CNT(n) (0x28+0x10*n)
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struct atctmr_timer_regs {
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u32 id_rev; /* 0x00 */
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u32 reservd[3]; /* 0x04 ~ 0x0c */
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u32 cfg; /* 0x10 */
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u32 int_en; /* 0x14 */
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u32 int_st; /* 0x18 */
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u32 ch_en; /* 0x1c */
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u32 ch0_ctrl; /* 0x20 */
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u32 ch0_reload; /* 0x24 */
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u32 ch0_cntr; /* 0x28 */
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u32 reservd1; /* 0x2c */
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u32 ch1_ctrl; /* 0x30 */
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u32 ch1_reload; /* 0x34 */
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u32 int_mask; /* 0x38 */
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};
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struct atcpit_timer_platdata {
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u32 *regs;
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};
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static u64 atcpit_timer_get_count(struct udevice *dev)
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{
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struct atcpit_timer_platdata *plat = dev_get_platdata(dev);
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u32 val;
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val = ~(REG32_TMR(CH_CNT(1))+0xffffffff);
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return timer_conv_64(val);
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}
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static int atcpit_timer_probe(struct udevice *dev)
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{
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struct atcpit_timer_platdata *plat = dev_get_platdata(dev);
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REG32_TMR(CH_REL(1)) = 0xffffffff;
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REG32_TMR(CH_CTL(1)) = APB_CLK|TMR_32;
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REG32_TMR(CH_EN) |= CH_TMR_EN(1 , 0);
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return 0;
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}
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static int atcpit_timer_ofdata_to_platdata(struct udevice *dev)
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{
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struct atcpit_timer_platdata *plat = dev_get_platdata(dev);
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plat->regs = map_physmem(dev_read_addr(dev), 0x100 , MAP_NOCACHE);
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return 0;
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}
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static const struct timer_ops atcpit_timer_ops = {
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.get_count = atcpit_timer_get_count,
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};
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static const struct udevice_id atcpit_timer_ids[] = {
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{ .compatible = "andestech,atcpit100" },
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{}
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};
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U_BOOT_DRIVER(atcpit100_timer) = {
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.name = "atcpit100_timer",
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.id = UCLASS_TIMER,
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.of_match = atcpit_timer_ids,
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.ofdata_to_platdata = atcpit_timer_ofdata_to_platdata,
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.plat_auto = sizeof(struct atcpit_timer_platdata),
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.probe = atcpit_timer_probe,
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.ops = &atcpit_timer_ops,
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};
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