#include <mach/ssp.h>
#include <mach/regs-ssp.h>
-#ifdef CONFIG_PXA_SSP_LEGACY
-
-#define TIMEOUT 100000
-
-static irqreturn_t ssp_interrupt(int irq, void *dev_id)
-{
- struct ssp_dev *dev = dev_id;
- struct ssp_device *ssp = dev->ssp;
- unsigned int status;
-
- status = __raw_readl(ssp->mmio_base + SSSR);
- __raw_writel(status, ssp->mmio_base + SSSR);
-
- if (status & SSSR_ROR)
- printk(KERN_WARNING "SSP(%d): receiver overrun\n", dev->port);
-
- if (status & SSSR_TUR)
- printk(KERN_WARNING "SSP(%d): transmitter underrun\n", dev->port);
-
- if (status & SSSR_BCE)
- printk(KERN_WARNING "SSP(%d): bit count error\n", dev->port);
-
- return IRQ_HANDLED;
-}
-
-/**
- * ssp_write_word - write a word to the SSP port
- * @data: 32-bit, MSB justified data to write.
- *
- * Wait for a free entry in the SSP transmit FIFO, and write a data
- * word to the SSP port.
- *
- * The caller is expected to perform the necessary locking.
- *
- * Returns:
- * %-ETIMEDOUT timeout occurred
- * 0 success
- */
-int ssp_write_word(struct ssp_dev *dev, u32 data)
-{
- struct ssp_device *ssp = dev->ssp;
- int timeout = TIMEOUT;
-
- while (!(__raw_readl(ssp->mmio_base + SSSR) & SSSR_TNF)) {
- if (!--timeout)
- return -ETIMEDOUT;
- cpu_relax();
- }
-
- __raw_writel(data, ssp->mmio_base + SSDR);
-
- return 0;
-}
-
-/**
- * ssp_read_word - read a word from the SSP port
- *
- * Wait for a data word in the SSP receive FIFO, and return the
- * received data. Data is LSB justified.
- *
- * Note: Currently, if data is not expected to be received, this
- * function will wait for ever.
- *
- * The caller is expected to perform the necessary locking.
- *
- * Returns:
- * %-ETIMEDOUT timeout occurred
- * 32-bit data success
- */
-int ssp_read_word(struct ssp_dev *dev, u32 *data)
-{
- struct ssp_device *ssp = dev->ssp;
- int timeout = TIMEOUT;
-
- while (!(__raw_readl(ssp->mmio_base + SSSR) & SSSR_RNE)) {
- if (!--timeout)
- return -ETIMEDOUT;
- cpu_relax();
- }
-
- *data = __raw_readl(ssp->mmio_base + SSDR);
- return 0;
-}
-
-/**
- * ssp_flush - flush the transmit and receive FIFOs
- *
- * Wait for the SSP to idle, and ensure that the receive FIFO
- * is empty.
- *
- * The caller is expected to perform the necessary locking.
- */
-int ssp_flush(struct ssp_dev *dev)
-{
- struct ssp_device *ssp = dev->ssp;
- int timeout = TIMEOUT * 2;
-
- /* ensure TX FIFO is empty instead of not full */
- if (cpu_is_pxa3xx()) {
- while (__raw_readl(ssp->mmio_base + SSSR) & 0xf00) {
- if (!--timeout)
- return -ETIMEDOUT;
- cpu_relax();
- }
- timeout = TIMEOUT * 2;
- }
-
- do {
- while (__raw_readl(ssp->mmio_base + SSSR) & SSSR_RNE) {
- if (!--timeout)
- return -ETIMEDOUT;
- (void)__raw_readl(ssp->mmio_base + SSDR);
- }
- if (!--timeout)
- return -ETIMEDOUT;
- } while (__raw_readl(ssp->mmio_base + SSSR) & SSSR_BSY);
-
- return 0;
-}
-
-/**
- * ssp_enable - enable the SSP port
- *
- * Turn on the SSP port.
- */
-void ssp_enable(struct ssp_dev *dev)
-{
- struct ssp_device *ssp = dev->ssp;
- uint32_t sscr0;
-
- sscr0 = __raw_readl(ssp->mmio_base + SSCR0);
- sscr0 |= SSCR0_SSE;
- __raw_writel(sscr0, ssp->mmio_base + SSCR0);
-}
-
-/**
- * ssp_disable - shut down the SSP port
- *
- * Turn off the SSP port, optionally powering it down.
- */
-void ssp_disable(struct ssp_dev *dev)
-{
- struct ssp_device *ssp = dev->ssp;
- uint32_t sscr0;
-
- sscr0 = __raw_readl(ssp->mmio_base + SSCR0);
- sscr0 &= ~SSCR0_SSE;
- __raw_writel(sscr0, ssp->mmio_base + SSCR0);
-}
-
-/**
- * ssp_save_state - save the SSP configuration
- * @ssp: pointer to structure to save SSP configuration
- *
- * Save the configured SSP state for suspend.
- */
-void ssp_save_state(struct ssp_dev *dev, struct ssp_state *state)
-{
- struct ssp_device *ssp = dev->ssp;
-
- state->cr0 = __raw_readl(ssp->mmio_base + SSCR0);
- state->cr1 = __raw_readl(ssp->mmio_base + SSCR1);
- state->to = __raw_readl(ssp->mmio_base + SSTO);
- state->psp = __raw_readl(ssp->mmio_base + SSPSP);
-
- ssp_disable(dev);
-}
-
-/**
- * ssp_restore_state - restore a previously saved SSP configuration
- * @ssp: pointer to configuration saved by ssp_save_state
- *
- * Restore the SSP configuration saved previously by ssp_save_state.
- */
-void ssp_restore_state(struct ssp_dev *dev, struct ssp_state *state)
-{
- struct ssp_device *ssp = dev->ssp;
- uint32_t sssr = SSSR_ROR | SSSR_TUR | SSSR_BCE;
-
- __raw_writel(sssr, ssp->mmio_base + SSSR);
-
- __raw_writel(state->cr0 & ~SSCR0_SSE, ssp->mmio_base + SSCR0);
- __raw_writel(state->cr1, ssp->mmio_base + SSCR1);
- __raw_writel(state->to, ssp->mmio_base + SSTO);
- __raw_writel(state->psp, ssp->mmio_base + SSPSP);
- __raw_writel(state->cr0, ssp->mmio_base + SSCR0);
-}
-
-/**
- * ssp_config - configure SSP port settings
- * @mode: port operating mode
- * @flags: port config flags
- * @psp_flags: port PSP config flags
- * @speed: port speed
- *
- * Port MUST be disabled by ssp_disable before making any config changes.
- */
-int ssp_config(struct ssp_dev *dev, u32 mode, u32 flags, u32 psp_flags, u32 speed)
-{
- struct ssp_device *ssp = dev->ssp;
-
- dev->mode = mode;
- dev->flags = flags;
- dev->psp_flags = psp_flags;
- dev->speed = speed;
-
- /* set up port type, speed, port settings */
- __raw_writel((dev->speed | dev->mode), ssp->mmio_base + SSCR0);
- __raw_writel(dev->flags, ssp->mmio_base + SSCR1);
- __raw_writel(dev->psp_flags, ssp->mmio_base + SSPSP);
-
- return 0;
-}
-
-/**
- * ssp_init - setup the SSP port
- *
- * initialise and claim resources for the SSP port.
- *
- * Returns:
- * %-ENODEV if the SSP port is unavailable
- * %-EBUSY if the resources are already in use
- * %0 on success
- */
-int ssp_init(struct ssp_dev *dev, u32 port, u32 init_flags)
-{
- struct ssp_device *ssp;
- int ret;
-
- ssp = ssp_request(port, "SSP");
- if (ssp == NULL)
- return -ENODEV;
-
- dev->ssp = ssp;
- dev->port = port;
-
- /* do we need to get irq */
- if (!(init_flags & SSP_NO_IRQ)) {
- ret = request_irq(ssp->irq, ssp_interrupt,
- 0, "SSP", dev);
- if (ret)
- goto out_region;
- dev->irq = ssp->irq;
- } else
- dev->irq = NO_IRQ;
-
- /* turn on SSP port clock */
- clk_enable(ssp->clk);
- return 0;
-
-out_region:
- ssp_free(ssp);
- return ret;
-}
-
-/**
- * ssp_exit - undo the effects of ssp_init
- *
- * release and free resources for the SSP port.
- */
-void ssp_exit(struct ssp_dev *dev)
-{
- struct ssp_device *ssp = dev->ssp;
-
- ssp_disable(dev);
- if (dev->irq != NO_IRQ)
- free_irq(dev->irq, dev);
- clk_disable(ssp->clk);
- ssp_free(ssp);
-}
-#endif /* CONFIG_PXA_SSP_LEGACY */
-
static DEFINE_MUTEX(ssp_lock);
static LIST_HEAD(ssp_list);
arch_initcall(pxa_ssp_init);
module_exit(pxa_ssp_exit);
-#ifdef CONFIG_PXA_SSP_LEGACY
-EXPORT_SYMBOL(ssp_write_word);
-EXPORT_SYMBOL(ssp_read_word);
-EXPORT_SYMBOL(ssp_flush);
-EXPORT_SYMBOL(ssp_enable);
-EXPORT_SYMBOL(ssp_disable);
-EXPORT_SYMBOL(ssp_save_state);
-EXPORT_SYMBOL(ssp_restore_state);
-EXPORT_SYMBOL(ssp_init);
-EXPORT_SYMBOL(ssp_exit);
-EXPORT_SYMBOL(ssp_config);
-#endif
-
MODULE_DESCRIPTION("PXA SSP driver");
MODULE_AUTHOR("Liam Girdwood");
MODULE_LICENSE("GPL");
-
projects / platform / kernel / linux-stable.git / commitdiff