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108 lines
2.8 KiB
108 lines
2.8 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* TI OMAP timer driver |
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* |
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* Copyright (C) 2015, Texas Instruments, Incorporated |
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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 <asm/io.h> |
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#include <asm/arch/clock.h> |
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/* Timer register bits */ |
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#define TCLR_START BIT(0) /* Start=1 */ |
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#define TCLR_AUTO_RELOAD BIT(1) /* Auto reload */ |
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#define TCLR_PRE_EN BIT(5) /* Pre-scaler enable */ |
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#define TCLR_PTV_SHIFT (2) /* Pre-scaler shift value */ |
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#define TIMER_CLOCK (V_SCLK / (2 << CONFIG_SYS_PTV)) |
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struct omap_gptimer_regs { |
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unsigned int tidr; /* offset 0x00 */ |
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unsigned char res1[12]; |
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unsigned int tiocp_cfg; /* offset 0x10 */ |
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unsigned char res2[12]; |
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unsigned int tier; /* offset 0x20 */ |
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unsigned int tistatr; /* offset 0x24 */ |
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unsigned int tistat; /* offset 0x28 */ |
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unsigned int tisr; /* offset 0x2c */ |
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unsigned int tcicr; /* offset 0x30 */ |
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unsigned int twer; /* offset 0x34 */ |
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unsigned int tclr; /* offset 0x38 */ |
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unsigned int tcrr; /* offset 0x3c */ |
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unsigned int tldr; /* offset 0x40 */ |
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unsigned int ttgr; /* offset 0x44 */ |
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unsigned int twpc; /* offset 0x48 */ |
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unsigned int tmar; /* offset 0x4c */ |
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unsigned int tcar1; /* offset 0x50 */ |
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unsigned int tscir; /* offset 0x54 */ |
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unsigned int tcar2; /* offset 0x58 */ |
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}; |
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/* Omap Timer Priv */ |
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struct omap_timer_priv { |
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struct omap_gptimer_regs *regs; |
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}; |
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static int omap_timer_get_count(struct udevice *dev, u64 *count) |
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{ |
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struct omap_timer_priv *priv = dev_get_priv(dev); |
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*count = timer_conv_64(readl(&priv->regs->tcrr)); |
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return 0; |
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} |
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static int omap_timer_probe(struct udevice *dev) |
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{ |
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struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev); |
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struct omap_timer_priv *priv = dev_get_priv(dev); |
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if (!uc_priv->clock_rate) |
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uc_priv->clock_rate = TIMER_CLOCK; |
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/* start the counter ticking up, reload value on overflow */ |
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writel(0, &priv->regs->tldr); |
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writel(0, &priv->regs->tcrr); |
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/* enable timer */ |
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writel((CONFIG_SYS_PTV << 2) | TCLR_PRE_EN | TCLR_AUTO_RELOAD | |
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TCLR_START, &priv->regs->tclr); |
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return 0; |
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} |
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static int omap_timer_ofdata_to_platdata(struct udevice *dev) |
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{ |
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struct omap_timer_priv *priv = dev_get_priv(dev); |
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priv->regs = map_physmem(devfdt_get_addr(dev), |
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sizeof(struct omap_gptimer_regs), MAP_NOCACHE); |
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return 0; |
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} |
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static const struct timer_ops omap_timer_ops = { |
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.get_count = omap_timer_get_count, |
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}; |
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static const struct udevice_id omap_timer_ids[] = { |
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{ .compatible = "ti,am335x-timer" }, |
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{ .compatible = "ti,am4372-timer" }, |
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{ .compatible = "ti,omap5430-timer" }, |
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{} |
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}; |
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U_BOOT_DRIVER(omap_timer) = { |
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.name = "omap_timer", |
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.id = UCLASS_TIMER, |
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.of_match = omap_timer_ids, |
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.ofdata_to_platdata = omap_timer_ofdata_to_platdata, |
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.priv_auto_alloc_size = sizeof(struct omap_timer_priv), |
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.probe = omap_timer_probe, |
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.ops = &omap_timer_ops, |
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.flags = DM_FLAG_PRE_RELOC, |
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};
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