diff options
Diffstat (limited to 'arch/arm/plat-omap')
| -rw-r--r-- | arch/arm/plat-omap/include/plat/mcbsp.h | 3 | ||||
| -rw-r--r-- | arch/arm/plat-omap/mcbsp.c | 77 |
2 files changed, 55 insertions, 25 deletions
diff --git a/arch/arm/plat-omap/include/plat/mcbsp.h b/arch/arm/plat-omap/include/plat/mcbsp.h index d93fa44b1c9..4df957b1d25 100644 --- a/arch/arm/plat-omap/include/plat/mcbsp.h +++ b/arch/arm/plat-omap/include/plat/mcbsp.h @@ -414,9 +414,10 @@ struct omap_mcbsp { u16 max_tx_thres; u16 max_rx_thres; #endif + void *reg_cache; }; extern struct omap_mcbsp **mcbsp_ptr; -extern int omap_mcbsp_count; +extern int omap_mcbsp_count, omap_mcbsp_cache_size; int omap_mcbsp_init(void); void omap_mcbsp_register_board_cfg(struct omap_mcbsp_platform_data *config, diff --git a/arch/arm/plat-omap/mcbsp.c b/arch/arm/plat-omap/mcbsp.c index f8245f25825..61e440a0f7c 100644 --- a/arch/arm/plat-omap/mcbsp.c +++ b/arch/arm/plat-omap/mcbsp.c @@ -28,28 +28,42 @@ #include <plat/mcbsp.h> struct omap_mcbsp **mcbsp_ptr; -int omap_mcbsp_count; +int omap_mcbsp_count, omap_mcbsp_cache_size; void omap_mcbsp_write(struct omap_mcbsp *mcbsp, u16 reg, u32 val) { - if (cpu_class_is_omap1() || cpu_is_omap2420()) + if (cpu_class_is_omap1()) { + ((u16 *)mcbsp->reg_cache)[reg / sizeof(u16)] = (u16)val; __raw_writew((u16)val, mcbsp->io_base + reg); - else + } else if (cpu_is_omap2420()) { + ((u16 *)mcbsp->reg_cache)[reg / sizeof(u32)] = (u16)val; + __raw_writew((u16)val, mcbsp->io_base + reg); + } else { + ((u32 *)mcbsp->reg_cache)[reg / sizeof(u32)] = val; __raw_writel(val, mcbsp->io_base + reg); + } } -int omap_mcbsp_read(struct omap_mcbsp *mcbsp, u16 reg) +int omap_mcbsp_read(struct omap_mcbsp *mcbsp, u16 reg, bool from_cache) { - if (cpu_class_is_omap1() || cpu_is_omap2420()) - return __raw_readw(mcbsp->io_base + reg); - else - return __raw_readl(mcbsp->io_base + reg); + if (cpu_class_is_omap1()) { + return !from_cache ? __raw_readw(mcbsp->io_base + reg) : + ((u16 *)mcbsp->reg_cache)[reg / sizeof(u16)]; + } else if (cpu_is_omap2420()) { + return !from_cache ? __raw_readw(mcbsp->io_base + reg) : + ((u16 *)mcbsp->reg_cache)[reg / sizeof(u32)]; + } else { + return !from_cache ? __raw_readl(mcbsp->io_base + reg) : + ((u32 *)mcbsp->reg_cache)[reg / sizeof(u32)]; + } } #define MCBSP_READ(mcbsp, reg) \ - omap_mcbsp_read(mcbsp, OMAP_MCBSP_REG_##reg) + omap_mcbsp_read(mcbsp, OMAP_MCBSP_REG_##reg, 0) #define MCBSP_WRITE(mcbsp, reg, val) \ omap_mcbsp_write(mcbsp, OMAP_MCBSP_REG_##reg, val) +#define MCBSP_READ_CACHE(mcbsp, reg) \ + omap_mcbsp_read(mcbsp, OMAP_MCBSP_REG_##reg, 1) #define omap_mcbsp_check_valid_id(id) (id < omap_mcbsp_count) #define id_to_mcbsp_ptr(id) mcbsp_ptr[id]; @@ -383,6 +397,7 @@ EXPORT_SYMBOL(omap_mcbsp_set_io_type); int omap_mcbsp_request(unsigned int id) { struct omap_mcbsp *mcbsp; + void *reg_cache; int err; if (!omap_mcbsp_check_valid_id(id)) { @@ -391,15 +406,21 @@ int omap_mcbsp_request(unsigned int id) } mcbsp = id_to_mcbsp_ptr(id); + reg_cache = kzalloc(omap_mcbsp_cache_size, GFP_KERNEL); + if (!reg_cache) { + return -ENOMEM; + } + spin_lock(&mcbsp->lock); if (!mcbsp->free) { dev_err(mcbsp->dev, "McBSP%d is currently in use\n", mcbsp->id); - spin_unlock(&mcbsp->lock); - return -EBUSY; + err = -EBUSY; + goto err_kfree; } mcbsp->free = 0; + mcbsp->reg_cache = reg_cache; spin_unlock(&mcbsp->lock); if (mcbsp->pdata && mcbsp->pdata->ops && mcbsp->pdata->ops->request) @@ -427,7 +448,7 @@ int omap_mcbsp_request(unsigned int id) dev_err(mcbsp->dev, "Unable to request TX IRQ %d " "for McBSP%d\n", mcbsp->tx_irq, mcbsp->id); - goto error; + goto err_clk_disable; } init_completion(&mcbsp->rx_irq_completion); @@ -437,16 +458,16 @@ int omap_mcbsp_request(unsigned int id) dev_err(mcbsp->dev, "Unable to request RX IRQ %d " "for McBSP%d\n", mcbsp->rx_irq, mcbsp->id); - goto tx_irq; + goto err_free_irq; } } return 0; -tx_irq: +err_free_irq: free_irq(mcbsp->tx_irq, (void *)mcbsp); -error: +err_clk_disable: if (mcbsp->pdata && mcbsp->pdata->ops && mcbsp->pdata->ops->free) - mcbsp->pdata->ops->free(id); + mcbsp->pdata->ops->free(id); /* Do procedure specific to omap34xx arch, if applicable */ omap34xx_mcbsp_free(mcbsp); @@ -454,7 +475,12 @@ error: clk_disable(mcbsp->fclk); clk_disable(mcbsp->iclk); + spin_lock(&mcbsp->lock); mcbsp->free = 1; + mcbsp->reg_cache = NULL; +err_kfree: + spin_unlock(&mcbsp->lock); + kfree(reg_cache); return err; } @@ -463,6 +489,7 @@ EXPORT_SYMBOL(omap_mcbsp_request); void omap_mcbsp_free(unsigned int id) { struct omap_mcbsp *mcbsp; + void *reg_cache; if (!omap_mcbsp_check_valid_id(id)) { printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1); @@ -485,16 +512,18 @@ void omap_mcbsp_free(unsigned int id) free_irq(mcbsp->tx_irq, (void *)mcbsp); } - spin_lock(&mcbsp->lock); - if (mcbsp->free) { - dev_err(mcbsp->dev, "McBSP%d was not reserved\n", - mcbsp->id); - spin_unlock(&mcbsp->lock); - return; - } + reg_cache = mcbsp->reg_cache; - mcbsp->free = 1; + spin_lock(&mcbsp->lock); + if (mcbsp->free) + dev_err(mcbsp->dev, "McBSP%d was not reserved\n", mcbsp->id); + else + mcbsp->free = 1; + mcbsp->reg_cache = NULL; spin_unlock(&mcbsp->lock); + + if (reg_cache) + kfree(reg_cache); } EXPORT_SYMBOL(omap_mcbsp_free); |