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rtc: omap: Support scratch registers
Register an nvmem device to expose the 3 scratch registers (total of 12 bytes) to both userspace and kernel space. Reviewed-by: Sekhar Nori <nsekhar@ti.com> Tested-by: Keerthy <j-keerthy@ti.com> Reviewed-by: Keerthy <j-keerthy@ti.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
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1 changed files with 45 additions and 0 deletions
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@ -70,6 +70,10 @@
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#define OMAP_RTC_COMP_MSB_REG 0x50
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#define OMAP_RTC_OSC_REG 0x54
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#define OMAP_RTC_SCRATCH0_REG 0x60
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#define OMAP_RTC_SCRATCH1_REG 0x64
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#define OMAP_RTC_SCRATCH2_REG 0x68
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#define OMAP_RTC_KICK0_REG 0x6c
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#define OMAP_RTC_KICK1_REG 0x70
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@ -667,6 +671,45 @@ static struct pinctrl_desc rtc_pinctrl_desc = {
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.owner = THIS_MODULE,
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};
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static int omap_rtc_scratch_read(void *priv, unsigned int offset, void *_val,
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size_t bytes)
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{
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struct omap_rtc *rtc = priv;
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u32 *val = _val;
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int i;
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for (i = 0; i < bytes / 4; i++)
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val[i] = rtc_readl(rtc,
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OMAP_RTC_SCRATCH0_REG + offset + (i * 4));
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return 0;
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}
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static int omap_rtc_scratch_write(void *priv, unsigned int offset, void *_val,
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size_t bytes)
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{
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struct omap_rtc *rtc = priv;
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u32 *val = _val;
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int i;
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rtc->type->unlock(rtc);
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for (i = 0; i < bytes / 4; i++)
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rtc_writel(rtc,
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OMAP_RTC_SCRATCH0_REG + offset + (i * 4), val[i]);
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rtc->type->lock(rtc);
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return 0;
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}
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static struct nvmem_config omap_rtc_nvmem_config = {
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.name = "omap_rtc_scratch",
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.word_size = 4,
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.stride = 4,
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.size = OMAP_RTC_KICK0_REG - OMAP_RTC_SCRATCH0_REG,
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.reg_read = omap_rtc_scratch_read,
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.reg_write = omap_rtc_scratch_write,
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};
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static int omap_rtc_probe(struct platform_device *pdev)
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{
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struct omap_rtc *rtc;
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@ -804,6 +847,8 @@ static int omap_rtc_probe(struct platform_device *pdev)
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}
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rtc->rtc->ops = &omap_rtc_ops;
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omap_rtc_nvmem_config.priv = rtc;
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rtc->rtc->nvmem_config = &omap_rtc_nvmem_config;
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/* handle periodic and alarm irqs */
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ret = devm_request_irq(&pdev->dev, rtc->irq_timer, rtc_irq, 0,
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