diff options
Diffstat (limited to 'ANDROID_3.4.5/arch/arm/mach-sa1100/ssp.c')
| -rw-r--r-- | ANDROID_3.4.5/arch/arm/mach-sa1100/ssp.c | 243 |
1 files changed, 0 insertions, 243 deletions
diff --git a/ANDROID_3.4.5/arch/arm/mach-sa1100/ssp.c b/ANDROID_3.4.5/arch/arm/mach-sa1100/ssp.c deleted file mode 100644 index e22fca9a..00000000 --- a/ANDROID_3.4.5/arch/arm/mach-sa1100/ssp.c +++ /dev/null @@ -1,243 +0,0 @@ -/* - * linux/arch/arm/mach-sa1100/ssp.c - * - * Copyright (C) 2003 Russell King. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - * - * Generic SSP driver. This provides the generic core for simple - * IO-based SSP applications. - */ -#include <linux/module.h> -#include <linux/kernel.h> -#include <linux/sched.h> -#include <linux/errno.h> -#include <linux/interrupt.h> -#include <linux/ioport.h> -#include <linux/init.h> -#include <linux/io.h> - -#include <mach/hardware.h> -#include <mach/irqs.h> -#include <asm/hardware/ssp.h> - -#define TIMEOUT 100000 - -static irqreturn_t ssp_interrupt(int irq, void *dev_id) -{ - unsigned int status = Ser4SSSR; - - if (status & SSSR_ROR) - printk(KERN_WARNING "SSP: receiver overrun\n"); - - Ser4SSSR = SSSR_ROR; - - return status ? IRQ_HANDLED : IRQ_NONE; -} - -/** - * ssp_write_word - write a word to the SSP port - * @data: 16-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. Wait for the SSP port to start sending - * the data. - * - * The caller is expected to perform the necessary locking. - * - * Returns: - * %-ETIMEDOUT timeout occurred - * 0 success - */ -int ssp_write_word(u16 data) -{ - int timeout = TIMEOUT; - - while (!(Ser4SSSR & SSSR_TNF)) { - if (!--timeout) - return -ETIMEDOUT; - cpu_relax(); - } - - Ser4SSDR = data; - - timeout = TIMEOUT; - while (!(Ser4SSSR & SSSR_BSY)) { - if (!--timeout) - return -ETIMEDOUT; - cpu_relax(); - } - - 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 - * 16-bit data success - */ -int ssp_read_word(u16 *data) -{ - int timeout = TIMEOUT; - - while (!(Ser4SSSR & SSSR_RNE)) { - if (!--timeout) - return -ETIMEDOUT; - cpu_relax(); - } - - *data = (u16)Ser4SSDR; - - 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. - * - * Returns: - * %-ETIMEDOUT timeout occurred - * 0 success - */ -int ssp_flush(void) -{ - int timeout = TIMEOUT * 2; - - do { - while (Ser4SSSR & SSSR_RNE) { - if (!--timeout) - return -ETIMEDOUT; - (void) Ser4SSDR; - } - if (!--timeout) - return -ETIMEDOUT; - } while (Ser4SSSR & SSSR_BSY); - - return 0; -} - -/** - * ssp_enable - enable the SSP port - * - * Turn on the SSP port. - */ -void ssp_enable(void) -{ - Ser4SSCR0 |= SSCR0_SSE; -} - -/** - * ssp_disable - shut down the SSP port - * - * Turn off the SSP port, optionally powering it down. - */ -void ssp_disable(void) -{ - Ser4SSCR0 &= ~SSCR0_SSE; -} - -/** - * 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_state *ssp) -{ - ssp->cr0 = Ser4SSCR0; - ssp->cr1 = Ser4SSCR1; - - Ser4SSCR0 &= ~SSCR0_SSE; -} - -/** - * 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_state *ssp) -{ - Ser4SSSR = SSSR_ROR; - - Ser4SSCR0 = ssp->cr0 & ~SSCR0_SSE; - Ser4SSCR1 = ssp->cr1; - Ser4SSCR0 = ssp->cr0; -} - -/** - * 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(void) -{ - int ret; - - if (!(PPAR & PPAR_SPR) && (Ser4MCCR0 & MCCR0_MCE)) - return -ENODEV; - - if (!request_mem_region(__PREG(Ser4SSCR0), 0x18, "SSP")) { - return -EBUSY; - } - - Ser4SSSR = SSSR_ROR; - - ret = request_irq(IRQ_Ser4SSP, ssp_interrupt, 0, "SSP", NULL); - if (ret) - goto out_region; - - return 0; - - out_region: - release_mem_region(__PREG(Ser4SSCR0), 0x18); - return ret; -} - -/** - * ssp_exit - undo the effects of ssp_init - * - * release and free resources for the SSP port. - */ -void ssp_exit(void) -{ - Ser4SSCR0 &= ~SSCR0_SSE; - - free_irq(IRQ_Ser4SSP, NULL); - release_mem_region(__PREG(Ser4SSCR0), 0x18); -} - -MODULE_AUTHOR("Russell King"); -MODULE_DESCRIPTION("SA11x0 SSP PIO driver"); -MODULE_LICENSE("GPL"); - -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); |