From mboxrd@z Thu Jan 1 00:00:00 1970 From: hechtb@gmail.com (Bastian Hecht) Date: Sun, 17 Mar 2013 16:43:46 +0100 Subject: [PATCH v3 2/7] clocksource: sh_cmt: Add OF support In-Reply-To: <1363535031-21402-1-git-send-email-hechtb+renesas@gmail.com> References: <1363535031-21402-1-git-send-email-hechtb+renesas@gmail.com> Message-ID: <1363535031-21402-2-git-send-email-hechtb+renesas@gmail.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org We add the capabilty to probe SH CMT timer devices using Device Tree setup. Signed-off-by: Bastian Hecht --- v3: same (only patch 0003 changed) drivers/clocksource/sh_cmt.c | 109 +++++++++++++++++++++++++++++++++++++----- 1 file changed, 96 insertions(+), 13 deletions(-) diff --git a/drivers/clocksource/sh_cmt.c b/drivers/clocksource/sh_cmt.c index 08d0c41..79bc526 100644 --- a/drivers/clocksource/sh_cmt.c +++ b/drivers/clocksource/sh_cmt.c @@ -34,10 +34,13 @@ #include #include #include +#include struct sh_cmt_priv { void __iomem *mapbase; struct clk *clk; + long channel_offset; + int timer_bit; unsigned long width; /* 16 or 32 bit version of hardware block */ unsigned long overflow_bit; unsigned long clear_bits; @@ -109,9 +112,7 @@ static void sh_cmt_write32(void __iomem *base, unsigned long offs, static inline unsigned long sh_cmt_read_cmstr(struct sh_cmt_priv *p) { - struct sh_timer_config *cfg = p->pdev->dev.platform_data; - - return p->read_control(p->mapbase - cfg->channel_offset, 0); + return p->read_control(p->mapbase - p->channel_offset, 0); } static inline unsigned long sh_cmt_read_cmcsr(struct sh_cmt_priv *p) @@ -127,9 +128,7 @@ static inline unsigned long sh_cmt_read_cmcnt(struct sh_cmt_priv *p) static inline void sh_cmt_write_cmstr(struct sh_cmt_priv *p, unsigned long value) { - struct sh_timer_config *cfg = p->pdev->dev.platform_data; - - p->write_control(p->mapbase - cfg->channel_offset, 0, value); + p->write_control(p->mapbase - p->channel_offset, 0, value); } static inline void sh_cmt_write_cmcsr(struct sh_cmt_priv *p, @@ -176,7 +175,6 @@ static DEFINE_RAW_SPINLOCK(sh_cmt_lock); static void sh_cmt_start_stop_ch(struct sh_cmt_priv *p, int start) { - struct sh_timer_config *cfg = p->pdev->dev.platform_data; unsigned long flags, value; /* start stop register shared by multiple timer channels */ @@ -184,9 +182,9 @@ static void sh_cmt_start_stop_ch(struct sh_cmt_priv *p, int start) value = sh_cmt_read_cmstr(p); if (start) - value |= 1 << cfg->timer_bit; + value |= 1 << p->timer_bit; else - value &= ~(1 << cfg->timer_bit); + value &= ~(1 << p->timer_bit); sh_cmt_write_cmstr(p, value); raw_spin_unlock_irqrestore(&sh_cmt_lock, flags); @@ -673,9 +671,85 @@ static int sh_cmt_register(struct sh_cmt_priv *p, char *name, return 0; } -static int sh_cmt_setup(struct sh_cmt_priv *p, struct platform_device *pdev) +static const struct of_device_id of_sh_cmt_match[] = { + { .compatible = "renesas,cmt-timer" }, + {}, +}; +MODULE_DEVICE_TABLE(of, of_sh_cmt_match); + +static const int sh_cmt_offset_multiplier[] = { 0x60, 0x10, 0x40, 0x40, 0x40 }; +#define CMT_MAX_CHANNELS 6 + +static struct sh_timer_config *sh_cmt_parse_dt(struct device *dev) +{ + struct sh_timer_config *cfg; + struct device_node *np = dev->of_node; + u32 timer_id, channel_id, rating; + + if (!IS_ENABLED(CONFIG_OF) || !np) + return NULL; + + cfg = devm_kzalloc(dev, sizeof(struct sh_timer_config), GFP_KERNEL); + if (!cfg) { + dev_err(dev, "failed to allocate DT config data\n"); + return NULL; + } + + if (of_property_read_u32(np, "renesas,device-id", &timer_id)) { + dev_err(dev, "device id missing\n"); + return NULL; + } + if (timer_id >= ARRAY_SIZE(sh_cmt_offset_multiplier)) { + dev_err(dev, "invalid device id\n"); + return NULL; + } + + if (of_property_read_u32(np, "renesas,channel-id", &channel_id)) { + dev_err(dev, "channel id missing\n"); + return NULL; + } + if (channel_id >= CMT_MAX_CHANNELS) { + dev_err(dev, "invalid channel id\n"); + return NULL; + } + + cfg->channel_offset = sh_cmt_offset_multiplier[timer_id] * + (channel_id + 1); + cfg->timer_bit = channel_id; + + /* + * We convert the {source,event}-quality DT properties to linux specific + * clock{source,event}_ratings. + */ + if (!of_property_read_u32(np, "renesas,source-quality", &rating)) { + if (rating > 10) { + dev_err(dev, "invalid source-quality\n"); + return NULL; + } + if (rating) + cfg->clocksource_rating = rating * 50 - 1; + } + + if (!of_property_read_u32(np, "renesas,event-quality", &rating)) { + if (rating > 10) { + dev_err(dev, "invalid event-quality\n"); + return NULL; + } + if (rating) + cfg->clockevent_rating = rating * 50 - 1; + } + + if (!cfg->clocksource_rating && !cfg->clockevent_rating) { + dev_err(dev, "source- and event-quality 0, timer is unused\n"); + return NULL; + } + + return cfg; +} + +static int sh_cmt_setup(struct sh_cmt_priv *p, struct platform_device *pdev, + struct sh_timer_config *cfg) { - struct sh_timer_config *cfg = pdev->dev.platform_data; struct resource *res; int irq, ret; ret = -ENXIO; @@ -762,6 +836,9 @@ static int sh_cmt_setup(struct sh_cmt_priv *p, struct platform_device *pdev) goto err2; } + p->channel_offset = cfg->channel_offset; + p->timer_bit = cfg->timer_bit; + platform_set_drvdata(pdev, p); return 0; @@ -777,7 +854,7 @@ err0: static int sh_cmt_probe(struct platform_device *pdev) { struct sh_cmt_priv *p = platform_get_drvdata(pdev); - struct sh_timer_config *cfg = pdev->dev.platform_data; + struct sh_timer_config *cfg; int ret; if (!is_early_platform_device(pdev)) { @@ -785,6 +862,11 @@ static int sh_cmt_probe(struct platform_device *pdev) pm_runtime_enable(&pdev->dev); } + if (pdev->dev.of_node) + cfg = sh_cmt_parse_dt(&pdev->dev); + else + cfg = pdev->dev.platform_data; + if (p) { dev_info(&pdev->dev, "kept as earlytimer\n"); goto out; @@ -796,7 +878,7 @@ static int sh_cmt_probe(struct platform_device *pdev) return -ENOMEM; } - ret = sh_cmt_setup(p, pdev); + ret = sh_cmt_setup(p, pdev, cfg); if (ret) { kfree(p); pm_runtime_idle(&pdev->dev); @@ -824,6 +906,7 @@ static struct platform_driver sh_cmt_device_driver = { .remove = sh_cmt_remove, .driver = { .name = "sh_cmt", + .of_match_table = of_match_ptr(of_sh_cmt_match), } }; -- 1.7.9.5