diff options
Diffstat (limited to 'arch/arm')
| -rw-r--r-- | arch/arm/mach-pxa/ssp.c | 296 |
1 files changed, 240 insertions, 56 deletions
diff --git a/arch/arm/mach-pxa/ssp.c b/arch/arm/mach-pxa/ssp.c index 422afee..be6fee7 100644 --- a/arch/arm/mach-pxa/ssp.c +++ b/arch/arm/mach-pxa/ssp.c @@ -32,39 +32,18 @@ #include <linux/ioport.h> #include <linux/init.h> #include <linux/mutex.h> +#include <linux/clk.h> +#include <linux/err.h> +#include <linux/platform_device.h> + #include <asm/io.h> #include <asm/irq.h> #include <asm/hardware.h> #include <asm/arch/ssp.h> #include <asm/arch/pxa-regs.h> -#define PXA_SSP_PORTS 3 - #define TIMEOUT 100000 -struct ssp_info_ { - int irq; - u32 clock; -}; - -/* - * SSP port clock and IRQ settings - */ -static const struct ssp_info_ ssp_info[PXA_SSP_PORTS] = { -#if defined (CONFIG_PXA27x) - {IRQ_SSP, CKEN_SSP1}, - {IRQ_SSP2, CKEN_SSP2}, - {IRQ_SSP3, CKEN_SSP3}, -#else - {IRQ_SSP, CKEN_SSP}, - {IRQ_NSSP, CKEN_NSSP}, - {IRQ_ASSP, CKEN_ASSP}, -#endif -}; - -static DEFINE_MUTEX(mutex); -static int use_count[PXA_SSP_PORTS] = {0, 0, 0}; - static irqreturn_t ssp_interrupt(int irq, void *dev_id) { struct ssp_dev *dev = (struct ssp_dev*) dev_id; @@ -256,44 +235,32 @@ int ssp_config(struct ssp_dev *dev, u32 mode, u32 flags, u32 psp_flags, u32 spee */ int ssp_init(struct ssp_dev *dev, u32 port, u32 init_flags) { + struct ssp_device *ssp; int ret; - if (port > PXA_SSP_PORTS || port == 0) + ssp = ssp_request(port, "SSP"); + if (ssp == NULL) return -ENODEV; - mutex_lock(&mutex); - if (use_count[port - 1]) { - mutex_unlock(&mutex); - return -EBUSY; - } - use_count[port - 1]++; - - if (!request_mem_region(__PREG(SSCR0_P(port)), 0x2c, "SSP")) { - use_count[port - 1]--; - mutex_unlock(&mutex); - return -EBUSY; - } + dev->ssp = ssp; dev->port = port; /* do we need to get irq */ if (!(init_flags & SSP_NO_IRQ)) { - ret = request_irq(ssp_info[port-1].irq, ssp_interrupt, + ret = request_irq(ssp->irq, ssp_interrupt, 0, "SSP", dev); if (ret) goto out_region; - dev->irq = ssp_info[port-1].irq; + dev->irq = ssp->irq; } else dev->irq = 0; /* turn on SSP port clock */ - pxa_set_cken(ssp_info[port-1].clock, 1); - mutex_unlock(&mutex); + clk_enable(ssp->clk); return 0; out_region: - release_mem_region(__PREG(SSCR0_P(port)), 0x2c); - use_count[port - 1]--; - mutex_unlock(&mutex); + ssp_free(ssp); return ret; } @@ -304,22 +271,239 @@ out_region: */ void ssp_exit(struct ssp_dev *dev) { - mutex_lock(&mutex); + struct ssp_device *ssp = dev->ssp; + SSCR0_P(dev->port) &= ~SSCR0_SSE; + free_irq(dev->irq, dev); + clk_disable(ssp->clk); + ssp_free(ssp); +} + +static DEFINE_MUTEX(ssp_lock); +static LIST_HEAD(ssp_list); + +struct ssp_device *ssp_request(int port, const char *label) +{ + struct ssp_device *ssp = NULL; + + mutex_lock(&ssp_lock); - if (dev->port > PXA_SSP_PORTS || dev->port == 0) { - printk(KERN_WARNING "SSP: tried to close invalid port\n"); - mutex_unlock(&mutex); - return; + list_for_each_entry(ssp, &ssp_list, node) { + if (ssp->port_id == port && ssp->use_count == 0) { + ssp->use_count++; + ssp->label = label; + break; + } } - pxa_set_cken(ssp_info[dev->port-1].clock, 0); - if (dev->irq) - free_irq(dev->irq, dev); - release_mem_region(__PREG(SSCR0_P(dev->port)), 0x2c); - use_count[dev->port - 1]--; - mutex_unlock(&mutex); + mutex_unlock(&ssp_lock); + + if (ssp->port_id != port) + return NULL; + + return ssp; +} +EXPORT_SYMBOL(ssp_request); + +void ssp_free(struct ssp_device *ssp) +{ + mutex_lock(&ssp_lock); + if (ssp->use_count) { + ssp->use_count--; + ssp->label = NULL; + } else + dev_err(&ssp->pdev->dev, "device already free\n"); + mutex_unlock(&ssp_lock); } +EXPORT_SYMBOL(ssp_free); + +static int __devinit ssp_probe(struct platform_device *pdev, int type) +{ + struct resource *res; + struct ssp_device *ssp; + int ret = 0; + + ssp = kzalloc(sizeof(struct ssp_device), GFP_KERNEL); + if (ssp == NULL) { + dev_err(&pdev->dev, "failed to allocate memory"); + return -ENOMEM; + } + + ssp->clk = clk_get(&pdev->dev, "SSPCLK"); + if (IS_ERR(ssp->clk)) { + ret = PTR_ERR(ssp->clk); + goto err_free; + } + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (res == NULL) { + dev_err(&pdev->dev, "no memory resource defined\n"); + ret = -ENODEV; + goto err_free_clk; + } + + res = request_mem_region(res->start, res->end - res->start + 1, + pdev->name); + if (res == NULL) { + dev_err(&pdev->dev, "failed to request memory resource\n"); + ret = -EBUSY; + goto err_free_clk; + } + + ssp->phys_base = res->start; + + ssp->mmio_base = ioremap(res->start, res->end - res->start + 1); + if (ssp->mmio_base == NULL) { + dev_err(&pdev->dev, "failed to ioremap() registers\n"); + ret = -ENODEV; + goto err_free_mem; + } + + ssp->irq = platform_get_irq(pdev, 0); + if (ssp->irq < 0) { + dev_err(&pdev->dev, "no IRQ resource defined\n"); + ret = -ENODEV; + goto err_free_io; + } + + res = platform_get_resource(pdev, IORESOURCE_DMA, 0); + if (res == NULL) { + dev_err(&pdev->dev, "no SSP RX DRCMR defined\n"); + ret = -ENODEV; + goto err_free_io; + } + ssp->drcmr_rx = res->start; + + res = platform_get_resource(pdev, IORESOURCE_DMA, 1); + if (res == NULL) { + dev_err(&pdev->dev, "no SSP TX DRCMR defined\n"); + ret = -ENODEV; + goto err_free_io; + } + ssp->drcmr_tx = res->start; + + /* PXA2xx/3xx SSP ports starts from 1 and the internal pdev->id + * starts from 0, do a translation here + */ + ssp->port_id = pdev->id + 1; + ssp->use_count = 0; + ssp->type = type; + + mutex_lock(&ssp_lock); + list_add(&ssp->node, &ssp_list); + mutex_unlock(&ssp_lock); + + platform_set_drvdata(pdev, ssp); + return 0; + +err_free_io: + iounmap(ssp->mmio_base); +err_free_mem: + release_mem_region(res->start, res->end - res->start + 1); +err_free_clk: + clk_put(ssp->clk); +err_free: + kfree(ssp); + return ret; +} + +static int __devexit ssp_remove(struct platform_device *pdev) +{ + struct resource *res; + struct ssp_device *ssp; + + ssp = platform_get_drvdata(pdev); + if (ssp == NULL) + return -ENODEV; + + iounmap(ssp->mmio_base); + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + release_mem_region(res->start, res->end - res->start + 1); + + clk_put(ssp->clk); + + mutex_lock(&ssp_lock); + list_del(&ssp->node); + mutex_unlock(&ssp_lock); + + kfree(ssp); + return 0; +} + +static int __devinit pxa25x_ssp_probe(struct platform_device *pdev) +{ + return ssp_probe(pdev, PXA25x_SSP); +} + +static int __devinit pxa25x_nssp_probe(struct platform_device *pdev) +{ + return ssp_probe(pdev, PXA25x_NSSP); +} + +static int __devinit pxa27x_ssp_probe(struct platform_device *pdev) +{ + return ssp_probe(pdev, PXA27x_SSP); +} + +static struct platform_driver pxa25x_ssp_driver = { + .driver = { + .name = "pxa25x-ssp", + }, + .probe = pxa25x_ssp_probe, + .remove = __devexit_p(ssp_remove), +}; + +static struct platform_driver pxa25x_nssp_driver = { + .driver = { + .name = "pxa25x-nssp", + }, + .probe = pxa25x_nssp_probe, + .remove = __devexit_p(ssp_remove), +}; + +static struct platform_driver pxa27x_ssp_driver = { + .driver = { + .name = "pxa27x-ssp", + }, + .probe = pxa27x_ssp_probe, + .remove = __devexit_p(ssp_remove), +}; + +static int __init pxa_ssp_init(void) +{ + int ret = 0; + + ret = platform_driver_register(&pxa25x_ssp_driver); + if (ret) { + printk(KERN_ERR "failed to register pxa25x_ssp_driver"); + return ret; + } + + ret = platform_driver_register(&pxa25x_nssp_driver); + if (ret) { + printk(KERN_ERR "failed to register pxa25x_nssp_driver"); + return ret; + } + + ret = platform_driver_register(&pxa27x_ssp_driver); + if (ret) { + printk(KERN_ERR "failed to register pxa27x_ssp_driver"); + return ret; + } + + return ret; +} + +static void __exit pxa_ssp_exit(void) +{ + platform_driver_unregister(&pxa25x_ssp_driver); + platform_driver_unregister(&pxa25x_nssp_driver); + platform_driver_unregister(&pxa27x_ssp_driver); +} + +module_init(pxa_ssp_init); +module_exit(pxa_ssp_exit); EXPORT_SYMBOL(ssp_write_word); EXPORT_SYMBOL(ssp_read_word); |
