diff options
Diffstat (limited to 'drivers/clocksource/sh_tmu.c')
| -rw-r--r-- | drivers/clocksource/sh_tmu.c | 281 |
1 files changed, 194 insertions, 87 deletions
diff --git a/drivers/clocksource/sh_tmu.c b/drivers/clocksource/sh_tmu.c index 26a9f7dadfb..6bd17a8f3dd 100644 --- a/drivers/clocksource/sh_tmu.c +++ b/drivers/clocksource/sh_tmu.c @@ -11,29 +11,31 @@ * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ +#include <linux/clk.h> +#include <linux/clockchips.h> +#include <linux/clocksource.h> +#include <linux/delay.h> +#include <linux/err.h> #include <linux/init.h> -#include <linux/platform_device.h> -#include <linux/spinlock.h> #include <linux/interrupt.h> -#include <linux/ioport.h> -#include <linux/delay.h> #include <linux/io.h> -#include <linux/clk.h> +#include <linux/ioport.h> #include <linux/irq.h> -#include <linux/err.h> -#include <linux/clocksource.h> -#include <linux/clockchips.h> -#include <linux/sh_timer.h> -#include <linux/slab.h> #include <linux/module.h> +#include <linux/platform_device.h> #include <linux/pm_domain.h> #include <linux/pm_runtime.h> +#include <linux/sh_timer.h> +#include <linux/slab.h> +#include <linux/spinlock.h> + +enum sh_tmu_model { + SH_TMU_LEGACY, + SH_TMU, + SH_TMU_SH3, +}; struct sh_tmu_device; @@ -58,7 +60,13 @@ struct sh_tmu_device { void __iomem *mapbase; struct clk *clk; - struct sh_tmu_channel channel; + enum sh_tmu_model model; + + struct sh_tmu_channel *channels; + unsigned int num_channels; + + bool has_clockevent; + bool has_clocksource; }; static DEFINE_RAW_SPINLOCK(sh_tmu_lock); @@ -68,12 +76,29 @@ static DEFINE_RAW_SPINLOCK(sh_tmu_lock); #define TCNT 1 /* channel register */ #define TCR 2 /* channel register */ +#define TCR_UNF (1 << 8) +#define TCR_UNIE (1 << 5) +#define TCR_TPSC_CLK4 (0 << 0) +#define TCR_TPSC_CLK16 (1 << 0) +#define TCR_TPSC_CLK64 (2 << 0) +#define TCR_TPSC_CLK256 (3 << 0) +#define TCR_TPSC_CLK1024 (4 << 0) +#define TCR_TPSC_MASK (7 << 0) + static inline unsigned long sh_tmu_read(struct sh_tmu_channel *ch, int reg_nr) { unsigned long offs; - if (reg_nr == TSTR) - return ioread8(ch->tmu->mapbase); + if (reg_nr == TSTR) { + switch (ch->tmu->model) { + case SH_TMU_LEGACY: + return ioread8(ch->tmu->mapbase); + case SH_TMU_SH3: + return ioread8(ch->tmu->mapbase + 2); + case SH_TMU: + return ioread8(ch->tmu->mapbase + 4); + } + } offs = reg_nr << 2; @@ -89,8 +114,14 @@ static inline void sh_tmu_write(struct sh_tmu_channel *ch, int reg_nr, unsigned long offs; if (reg_nr == TSTR) { - iowrite8(value, ch->tmu->mapbase); - return; + switch (ch->tmu->model) { + case SH_TMU_LEGACY: + return iowrite8(value, ch->tmu->mapbase); + case SH_TMU_SH3: + return iowrite8(value, ch->tmu->mapbase + 2); + case SH_TMU: + return iowrite8(value, ch->tmu->mapbase + 4); + } } offs = reg_nr << 2; @@ -139,7 +170,7 @@ static int __sh_tmu_enable(struct sh_tmu_channel *ch) /* configure channel to parent clock / 4, irq off */ ch->rate = clk_get_rate(ch->tmu->clk) / 4; - sh_tmu_write(ch, TCR, 0x0000); + sh_tmu_write(ch, TCR, TCR_TPSC_CLK4); /* enable channel */ sh_tmu_start_stop_ch(ch, 1); @@ -164,7 +195,7 @@ static void __sh_tmu_disable(struct sh_tmu_channel *ch) sh_tmu_start_stop_ch(ch, 0); /* disable interrupts in TMU block */ - sh_tmu_write(ch, TCR, 0x0000); + sh_tmu_write(ch, TCR, TCR_TPSC_CLK4); /* stop clock */ clk_disable(ch->tmu->clk); @@ -194,7 +225,7 @@ static void sh_tmu_set_next(struct sh_tmu_channel *ch, unsigned long delta, sh_tmu_read(ch, TCR); /* enable interrupt */ - sh_tmu_write(ch, TCR, 0x0020); + sh_tmu_write(ch, TCR, TCR_UNIE | TCR_TPSC_CLK4); /* reload delta value in case of periodic timer */ if (periodic) @@ -214,9 +245,9 @@ static irqreturn_t sh_tmu_interrupt(int irq, void *dev_id) /* disable or acknowledge interrupt */ if (ch->ced.mode == CLOCK_EVT_MODE_ONESHOT) - sh_tmu_write(ch, TCR, 0x0000); + sh_tmu_write(ch, TCR, TCR_TPSC_CLK4); else - sh_tmu_write(ch, TCR, 0x0020); + sh_tmu_write(ch, TCR, TCR_UNIE | TCR_TPSC_CLK4); /* notify clockevent layer */ ch->ced.event_handler(&ch->ced); @@ -290,12 +321,12 @@ static void sh_tmu_clocksource_resume(struct clocksource *cs) } static int sh_tmu_register_clocksource(struct sh_tmu_channel *ch, - const char *name, unsigned long rating) + const char *name) { struct clocksource *cs = &ch->cs; cs->name = name; - cs->rating = rating; + cs->rating = 200; cs->read = sh_tmu_clocksource_read; cs->enable = sh_tmu_clocksource_enable; cs->disable = sh_tmu_clocksource_disable; @@ -392,7 +423,7 @@ static void sh_tmu_clock_event_resume(struct clock_event_device *ced) } static void sh_tmu_register_clockevent(struct sh_tmu_channel *ch, - const char *name, unsigned long rating) + const char *name) { struct clock_event_device *ced = &ch->ced; int ret; @@ -400,7 +431,7 @@ static void sh_tmu_register_clockevent(struct sh_tmu_channel *ch, ced->name = name; ced->features = CLOCK_EVT_FEAT_PERIODIC; ced->features |= CLOCK_EVT_FEAT_ONESHOT; - ced->rating = rating; + ced->rating = 200; ced->cpumask = cpumask_of(0); ced->set_next_event = sh_tmu_clock_event_next; ced->set_mode = sh_tmu_clock_event_mode; @@ -423,34 +454,51 @@ static void sh_tmu_register_clockevent(struct sh_tmu_channel *ch, } static int sh_tmu_register(struct sh_tmu_channel *ch, const char *name, - unsigned long clockevent_rating, - unsigned long clocksource_rating) + bool clockevent, bool clocksource) { - if (clockevent_rating) - sh_tmu_register_clockevent(ch, name, clockevent_rating); - else if (clocksource_rating) - sh_tmu_register_clocksource(ch, name, clocksource_rating); + if (clockevent) { + ch->tmu->has_clockevent = true; + sh_tmu_register_clockevent(ch, name); + } else if (clocksource) { + ch->tmu->has_clocksource = true; + sh_tmu_register_clocksource(ch, name); + } return 0; } -static int sh_tmu_channel_setup(struct sh_tmu_channel *ch, +static int sh_tmu_channel_setup(struct sh_tmu_channel *ch, unsigned int index, + bool clockevent, bool clocksource, struct sh_tmu_device *tmu) { - struct sh_timer_config *cfg = tmu->pdev->dev.platform_data; + /* Skip unused channels. */ + if (!clockevent && !clocksource) + return 0; ch->tmu = tmu; - /* - * The SH3 variant (SH770x, SH7705, SH7710 and SH7720) maps channel - * registers blocks at base + 2 + 12 * index, while all other variants - * map them at base + 4 + 12 * index. We can compute the index by just - * dividing by 12, the 2 bytes or 4 bytes offset being hidden by the - * integer division. - */ - ch->index = cfg->channel_offset / 12; + if (tmu->model == SH_TMU_LEGACY) { + struct sh_timer_config *cfg = tmu->pdev->dev.platform_data; + + /* + * The SH3 variant (SH770x, SH7705, SH7710 and SH7720) maps + * channel registers blocks at base + 2 + 12 * index, while all + * other variants map them at base + 4 + 12 * index. We can + * compute the index by just dividing by 12, the 2 bytes or 4 + * bytes offset being hidden by the integer division. + */ + ch->index = cfg->channel_offset / 12; + ch->base = tmu->mapbase + cfg->channel_offset; + } else { + ch->index = index; + + if (tmu->model == SH_TMU_SH3) + ch->base = tmu->mapbase + 4 + ch->index * 12; + else + ch->base = tmu->mapbase + 8 + ch->index * 12; + } - ch->irq = platform_get_irq(tmu->pdev, 0); + ch->irq = platform_get_irq(tmu->pdev, index); if (ch->irq < 0) { dev_err(&tmu->pdev->dev, "ch%u: failed to get irq\n", ch->index); @@ -461,76 +509,128 @@ static int sh_tmu_channel_setup(struct sh_tmu_channel *ch, ch->enable_count = 0; return sh_tmu_register(ch, dev_name(&tmu->pdev->dev), - cfg->clockevent_rating, - cfg->clocksource_rating); + clockevent, clocksource); } -static int sh_tmu_setup(struct sh_tmu_device *tmu, struct platform_device *pdev) +static int sh_tmu_map_memory(struct sh_tmu_device *tmu) { - struct sh_timer_config *cfg = pdev->dev.platform_data; struct resource *res; - int ret; - ret = -ENXIO; - - tmu->pdev = pdev; - - if (!cfg) { - dev_err(&tmu->pdev->dev, "missing platform data\n"); - goto err0; - } - - platform_set_drvdata(pdev, tmu); res = platform_get_resource(tmu->pdev, IORESOURCE_MEM, 0); if (!res) { dev_err(&tmu->pdev->dev, "failed to get I/O memory\n"); - goto err0; + return -ENXIO; } + tmu->mapbase = ioremap_nocache(res->start, resource_size(res)); + if (tmu->mapbase == NULL) + return -ENXIO; + /* - * Map memory, let channel.base point to our channel and mapbase to the - * start/stop shared register. + * In legacy platform device configuration (with one device per channel) + * the resource points to the channel base address. */ - tmu->channel.base = ioremap_nocache(res->start, resource_size(res)); - if (tmu->channel.base == NULL) { - dev_err(&tmu->pdev->dev, "failed to remap I/O memory\n"); - goto err0; + if (tmu->model == SH_TMU_LEGACY) { + struct sh_timer_config *cfg = tmu->pdev->dev.platform_data; + tmu->mapbase -= cfg->channel_offset; + } + + return 0; +} + +static void sh_tmu_unmap_memory(struct sh_tmu_device *tmu) +{ + if (tmu->model == SH_TMU_LEGACY) { + struct sh_timer_config *cfg = tmu->pdev->dev.platform_data; + tmu->mapbase += cfg->channel_offset; + } + + iounmap(tmu->mapbase); +} + +static int sh_tmu_setup(struct sh_tmu_device *tmu, struct platform_device *pdev) +{ + struct sh_timer_config *cfg = pdev->dev.platform_data; + const struct platform_device_id *id = pdev->id_entry; + unsigned int i; + int ret; + + if (!cfg) { + dev_err(&tmu->pdev->dev, "missing platform data\n"); + return -ENXIO; } - tmu->mapbase = tmu->channel.base - cfg->channel_offset; + tmu->pdev = pdev; + tmu->model = id->driver_data; - /* get hold of clock */ - tmu->clk = clk_get(&tmu->pdev->dev, "tmu_fck"); + /* Get hold of clock. */ + tmu->clk = clk_get(&tmu->pdev->dev, + tmu->model == SH_TMU_LEGACY ? "tmu_fck" : "fck"); if (IS_ERR(tmu->clk)) { dev_err(&tmu->pdev->dev, "cannot get clock\n"); - ret = PTR_ERR(tmu->clk); - goto err1; + return PTR_ERR(tmu->clk); } ret = clk_prepare(tmu->clk); if (ret < 0) - goto err2; + goto err_clk_put; - ret = sh_tmu_channel_setup(&tmu->channel, tmu); - if (ret < 0) - goto err3; + /* Map the memory resource. */ + ret = sh_tmu_map_memory(tmu); + if (ret < 0) { + dev_err(&tmu->pdev->dev, "failed to remap I/O memory\n"); + goto err_clk_unprepare; + } + + /* Allocate and setup the channels. */ + if (tmu->model == SH_TMU_LEGACY) + tmu->num_channels = 1; + else + tmu->num_channels = hweight8(cfg->channels_mask); + + tmu->channels = kzalloc(sizeof(*tmu->channels) * tmu->num_channels, + GFP_KERNEL); + if (tmu->channels == NULL) { + ret = -ENOMEM; + goto err_unmap; + } + + if (tmu->model == SH_TMU_LEGACY) { + ret = sh_tmu_channel_setup(&tmu->channels[0], 0, + cfg->clockevent_rating != 0, + cfg->clocksource_rating != 0, tmu); + if (ret < 0) + goto err_unmap; + } else { + /* + * Use the first channel as a clock event device and the second + * channel as a clock source. + */ + for (i = 0; i < tmu->num_channels; ++i) { + ret = sh_tmu_channel_setup(&tmu->channels[i], i, + i == 0, i == 1, tmu); + if (ret < 0) + goto err_unmap; + } + } + + platform_set_drvdata(pdev, tmu); return 0; - err3: +err_unmap: + kfree(tmu->channels); + sh_tmu_unmap_memory(tmu); +err_clk_unprepare: clk_unprepare(tmu->clk); - err2: +err_clk_put: clk_put(tmu->clk); - err1: - iounmap(tmu->channel.base); - err0: return ret; } static int sh_tmu_probe(struct platform_device *pdev) { struct sh_tmu_device *tmu = platform_get_drvdata(pdev); - struct sh_timer_config *cfg = pdev->dev.platform_data; int ret; if (!is_early_platform_device(pdev)) { @@ -544,10 +644,8 @@ static int sh_tmu_probe(struct platform_device *pdev) } tmu = kzalloc(sizeof(*tmu), GFP_KERNEL); - if (tmu == NULL) { - dev_err(&pdev->dev, "failed to allocate driver data\n"); + if (tmu == NULL) return -ENOMEM; - } ret = sh_tmu_setup(tmu, pdev); if (ret) { @@ -559,7 +657,7 @@ static int sh_tmu_probe(struct platform_device *pdev) return 0; out: - if (cfg->clockevent_rating || cfg->clocksource_rating) + if (tmu->has_clockevent || tmu->has_clocksource) pm_runtime_irq_safe(&pdev->dev); else pm_runtime_idle(&pdev->dev); @@ -572,12 +670,21 @@ static int sh_tmu_remove(struct platform_device *pdev) return -EBUSY; /* cannot unregister clockevent and clocksource */ } +static const struct platform_device_id sh_tmu_id_table[] = { + { "sh_tmu", SH_TMU_LEGACY }, + { "sh-tmu", SH_TMU }, + { "sh-tmu-sh3", SH_TMU_SH3 }, + { } +}; +MODULE_DEVICE_TABLE(platform, sh_tmu_id_table); + static struct platform_driver sh_tmu_device_driver = { .probe = sh_tmu_probe, .remove = sh_tmu_remove, .driver = { .name = "sh_tmu", - } + }, + .id_table = sh_tmu_id_table, }; static int __init sh_tmu_init(void) |