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[ARM] pxa: remove the now legacy SSP API
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Signed-off-by: Eric Miao <eric.y.miao@gmail.com>
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Eric Miao committed May 11, 2010
1 parent 639b91a commit 793ffb9
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5 changes: 0 additions & 5 deletions arch/arm/mach-pxa/Kconfig
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Expand Up @@ -653,11 +653,6 @@ config PXA_SSP
help
Enable support for PXA2xx SSP ports

config PXA_SSP_LEGACY
bool
help
Support of legacy SSP API

config TOSA_BT
tristate "Control the state of built-in bluetooth chip on Sharp SL-6000"
depends on MACH_TOSA
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35 changes: 0 additions & 35 deletions arch/arm/mach-pxa/include/mach/ssp.h
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Expand Up @@ -46,41 +46,6 @@ struct ssp_device {
int drcmr_tx;
};

#ifdef CONFIG_PXA_SSP_LEGACY
/*
* SSP initialisation flags
*/
#define SSP_NO_IRQ 0x1 /* don't register an irq handler in SSP driver */

struct ssp_state {
u32 cr0;
u32 cr1;
u32 to;
u32 psp;
};

struct ssp_dev {
struct ssp_device *ssp;
u32 port;
u32 mode;
u32 flags;
u32 psp_flags;
u32 speed;
int irq;
};

int ssp_write_word(struct ssp_dev *dev, u32 data);
int ssp_read_word(struct ssp_dev *dev, u32 *data);
int ssp_flush(struct ssp_dev *dev);
void ssp_enable(struct ssp_dev *dev);
void ssp_disable(struct ssp_dev *dev);
void ssp_save_state(struct ssp_dev *dev, struct ssp_state *ssp);
void ssp_restore_state(struct ssp_dev *dev, struct ssp_state *ssp);
int ssp_init(struct ssp_dev *dev, u32 port, u32 init_flags);
int ssp_config(struct ssp_dev *dev, u32 mode, u32 flags, u32 psp_flags, u32 speed);
void ssp_exit(struct ssp_dev *dev);
#endif /* CONFIG_PXA_SSP_LEGACY */

/**
* ssp_write_reg - Write to a SSP register
*
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286 changes: 0 additions & 286 deletions arch/arm/mach-pxa/ssp.c
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Original file line number Diff line number Diff line change
Expand Up @@ -35,278 +35,6 @@
#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);

Expand Down Expand Up @@ -491,20 +219,6 @@ static void __exit pxa_ssp_exit(void)
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");

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