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[ARM] pxa: define "struct ssp_device" and add ssp_request()/ssp_free()
1. define "struct ssp_device" for SSP information, which is requested and released by function ssp_request()/ssp_free() 2. modify the ssp_init() and ssp_exit() to use the interface Signed-off-by: eric miao <eric.miao@marvell.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
eric miao
Russell King
parent
d8e0db1111
commit
8828645046
@ -32,39 +32,18 @@
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#include <linux/ioport.h>
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#include <linux/init.h>
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#include <linux/mutex.h>
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#include <linux/clk.h>
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#include <linux/err.h>
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#include <linux/platform_device.h>
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#include <asm/io.h>
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#include <asm/irq.h>
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#include <asm/hardware.h>
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#include <asm/arch/ssp.h>
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#include <asm/arch/pxa-regs.h>
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#define PXA_SSP_PORTS 3
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#define TIMEOUT 100000
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struct ssp_info_ {
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int irq;
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u32 clock;
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};
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/*
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* SSP port clock and IRQ settings
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*/
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static const struct ssp_info_ ssp_info[PXA_SSP_PORTS] = {
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#if defined (CONFIG_PXA27x)
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{IRQ_SSP, CKEN_SSP1},
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{IRQ_SSP2, CKEN_SSP2},
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{IRQ_SSP3, CKEN_SSP3},
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#else
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{IRQ_SSP, CKEN_SSP},
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{IRQ_NSSP, CKEN_NSSP},
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{IRQ_ASSP, CKEN_ASSP},
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#endif
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};
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static DEFINE_MUTEX(mutex);
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static int use_count[PXA_SSP_PORTS] = {0, 0, 0};
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static irqreturn_t ssp_interrupt(int irq, void *dev_id)
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{
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struct ssp_dev *dev = (struct ssp_dev*) dev_id;
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@ -256,44 +235,32 @@ int ssp_config(struct ssp_dev *dev, u32 mode, u32 flags, u32 psp_flags, u32 spee
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*/
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int ssp_init(struct ssp_dev *dev, u32 port, u32 init_flags)
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{
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struct ssp_device *ssp;
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int ret;
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if (port > PXA_SSP_PORTS || port == 0)
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ssp = ssp_request(port, "SSP");
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if (ssp == NULL)
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return -ENODEV;
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mutex_lock(&mutex);
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if (use_count[port - 1]) {
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mutex_unlock(&mutex);
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return -EBUSY;
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}
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use_count[port - 1]++;
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if (!request_mem_region(__PREG(SSCR0_P(port)), 0x2c, "SSP")) {
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use_count[port - 1]--;
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mutex_unlock(&mutex);
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return -EBUSY;
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}
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dev->ssp = ssp;
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dev->port = port;
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/* do we need to get irq */
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if (!(init_flags & SSP_NO_IRQ)) {
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ret = request_irq(ssp_info[port-1].irq, ssp_interrupt,
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ret = request_irq(ssp->irq, ssp_interrupt,
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0, "SSP", dev);
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if (ret)
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goto out_region;
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dev->irq = ssp_info[port-1].irq;
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dev->irq = ssp->irq;
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} else
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dev->irq = 0;
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/* turn on SSP port clock */
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pxa_set_cken(ssp_info[port-1].clock, 1);
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mutex_unlock(&mutex);
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clk_enable(ssp->clk);
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return 0;
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out_region:
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release_mem_region(__PREG(SSCR0_P(port)), 0x2c);
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use_count[port - 1]--;
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mutex_unlock(&mutex);
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ssp_free(ssp);
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return ret;
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}
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@ -304,22 +271,239 @@ out_region:
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*/
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void ssp_exit(struct ssp_dev *dev)
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{
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mutex_lock(&mutex);
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SSCR0_P(dev->port) &= ~SSCR0_SSE;
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struct ssp_device *ssp = dev->ssp;
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if (dev->port > PXA_SSP_PORTS || dev->port == 0) {
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printk(KERN_WARNING "SSP: tried to close invalid port\n");
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mutex_unlock(&mutex);
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return;
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SSCR0_P(dev->port) &= ~SSCR0_SSE;
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free_irq(dev->irq, dev);
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clk_disable(ssp->clk);
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ssp_free(ssp);
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}
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static DEFINE_MUTEX(ssp_lock);
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static LIST_HEAD(ssp_list);
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struct ssp_device *ssp_request(int port, const char *label)
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{
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struct ssp_device *ssp = NULL;
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mutex_lock(&ssp_lock);
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list_for_each_entry(ssp, &ssp_list, node) {
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if (ssp->port_id == port && ssp->use_count == 0) {
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ssp->use_count++;
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ssp->label = label;
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break;
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}
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}
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pxa_set_cken(ssp_info[dev->port-1].clock, 0);
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if (dev->irq)
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free_irq(dev->irq, dev);
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release_mem_region(__PREG(SSCR0_P(dev->port)), 0x2c);
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use_count[dev->port - 1]--;
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mutex_unlock(&mutex);
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mutex_unlock(&ssp_lock);
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if (ssp->port_id != port)
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return NULL;
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return ssp;
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}
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EXPORT_SYMBOL(ssp_request);
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void ssp_free(struct ssp_device *ssp)
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{
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mutex_lock(&ssp_lock);
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if (ssp->use_count) {
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ssp->use_count--;
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ssp->label = NULL;
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} else
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dev_err(&ssp->pdev->dev, "device already free\n");
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mutex_unlock(&ssp_lock);
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}
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EXPORT_SYMBOL(ssp_free);
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static int __devinit ssp_probe(struct platform_device *pdev, int type)
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{
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struct resource *res;
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struct ssp_device *ssp;
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int ret = 0;
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ssp = kzalloc(sizeof(struct ssp_device), GFP_KERNEL);
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if (ssp == NULL) {
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dev_err(&pdev->dev, "failed to allocate memory");
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return -ENOMEM;
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}
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ssp->clk = clk_get(&pdev->dev, "SSPCLK");
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if (IS_ERR(ssp->clk)) {
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ret = PTR_ERR(ssp->clk);
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goto err_free;
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}
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (res == NULL) {
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dev_err(&pdev->dev, "no memory resource defined\n");
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ret = -ENODEV;
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goto err_free_clk;
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}
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res = request_mem_region(res->start, res->end - res->start + 1,
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pdev->name);
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if (res == NULL) {
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dev_err(&pdev->dev, "failed to request memory resource\n");
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ret = -EBUSY;
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goto err_free_clk;
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}
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ssp->phys_base = res->start;
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ssp->mmio_base = ioremap(res->start, res->end - res->start + 1);
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if (ssp->mmio_base == NULL) {
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dev_err(&pdev->dev, "failed to ioremap() registers\n");
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ret = -ENODEV;
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goto err_free_mem;
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}
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ssp->irq = platform_get_irq(pdev, 0);
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if (ssp->irq < 0) {
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dev_err(&pdev->dev, "no IRQ resource defined\n");
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ret = -ENODEV;
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goto err_free_io;
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}
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res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
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if (res == NULL) {
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dev_err(&pdev->dev, "no SSP RX DRCMR defined\n");
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ret = -ENODEV;
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goto err_free_io;
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}
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ssp->drcmr_rx = res->start;
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res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
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if (res == NULL) {
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dev_err(&pdev->dev, "no SSP TX DRCMR defined\n");
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ret = -ENODEV;
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goto err_free_io;
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}
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ssp->drcmr_tx = res->start;
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/* PXA2xx/3xx SSP ports starts from 1 and the internal pdev->id
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* starts from 0, do a translation here
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*/
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ssp->port_id = pdev->id + 1;
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ssp->use_count = 0;
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ssp->type = type;
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mutex_lock(&ssp_lock);
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list_add(&ssp->node, &ssp_list);
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mutex_unlock(&ssp_lock);
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platform_set_drvdata(pdev, ssp);
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return 0;
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err_free_io:
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iounmap(ssp->mmio_base);
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err_free_mem:
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release_mem_region(res->start, res->end - res->start + 1);
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err_free_clk:
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clk_put(ssp->clk);
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err_free:
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kfree(ssp);
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return ret;
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}
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static int __devexit ssp_remove(struct platform_device *pdev)
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{
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struct resource *res;
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struct ssp_device *ssp;
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ssp = platform_get_drvdata(pdev);
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if (ssp == NULL)
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return -ENODEV;
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iounmap(ssp->mmio_base);
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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release_mem_region(res->start, res->end - res->start + 1);
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clk_put(ssp->clk);
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mutex_lock(&ssp_lock);
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list_del(&ssp->node);
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mutex_unlock(&ssp_lock);
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kfree(ssp);
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return 0;
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}
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static int __devinit pxa25x_ssp_probe(struct platform_device *pdev)
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{
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return ssp_probe(pdev, PXA25x_SSP);
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}
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static int __devinit pxa25x_nssp_probe(struct platform_device *pdev)
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{
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return ssp_probe(pdev, PXA25x_NSSP);
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}
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static int __devinit pxa27x_ssp_probe(struct platform_device *pdev)
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{
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return ssp_probe(pdev, PXA27x_SSP);
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}
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static struct platform_driver pxa25x_ssp_driver = {
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.driver = {
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.name = "pxa25x-ssp",
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},
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.probe = pxa25x_ssp_probe,
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.remove = __devexit_p(ssp_remove),
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};
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static struct platform_driver pxa25x_nssp_driver = {
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.driver = {
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.name = "pxa25x-nssp",
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},
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.probe = pxa25x_nssp_probe,
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.remove = __devexit_p(ssp_remove),
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};
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static struct platform_driver pxa27x_ssp_driver = {
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.driver = {
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.name = "pxa27x-ssp",
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},
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.probe = pxa27x_ssp_probe,
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.remove = __devexit_p(ssp_remove),
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};
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static int __init pxa_ssp_init(void)
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{
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int ret = 0;
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ret = platform_driver_register(&pxa25x_ssp_driver);
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if (ret) {
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printk(KERN_ERR "failed to register pxa25x_ssp_driver");
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return ret;
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}
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ret = platform_driver_register(&pxa25x_nssp_driver);
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if (ret) {
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printk(KERN_ERR "failed to register pxa25x_nssp_driver");
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return ret;
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}
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ret = platform_driver_register(&pxa27x_ssp_driver);
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if (ret) {
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printk(KERN_ERR "failed to register pxa27x_ssp_driver");
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return ret;
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}
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return ret;
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}
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static void __exit pxa_ssp_exit(void)
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{
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platform_driver_unregister(&pxa25x_ssp_driver);
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platform_driver_unregister(&pxa25x_nssp_driver);
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platform_driver_unregister(&pxa27x_ssp_driver);
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}
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module_init(pxa_ssp_init);
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module_exit(pxa_ssp_exit);
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EXPORT_SYMBOL(ssp_write_word);
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EXPORT_SYMBOL(ssp_read_word);
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@ -13,10 +13,37 @@
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* PXA255 SSP, NSSP
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* PXA26x SSP, NSSP, ASSP
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* PXA27x SSP1, SSP2, SSP3
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* PXA3xx SSP1, SSP2, SSP3, SSP4
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*/
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#ifndef SSP_H
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#define SSP_H
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#ifndef __ASM_ARCH_SSP_H
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#define __ASM_ARCH_SSP_H
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#include <linux/list.h>
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enum pxa_ssp_type {
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SSP_UNDEFINED = 0,
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PXA25x_SSP, /* pxa 210, 250, 255, 26x */
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PXA25x_NSSP, /* pxa 255, 26x (including ASSP) */
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PXA27x_SSP,
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};
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struct ssp_device {
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struct platform_device *pdev;
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struct list_head node;
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struct clk *clk;
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void __iomem *mmio_base;
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unsigned long phys_base;
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const char *label;
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int port_id;
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int type;
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int use_count;
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int irq;
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int drcmr_rx;
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int drcmr_tx;
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};
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/*
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* SSP initialisation flags
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@ -31,6 +58,7 @@ struct ssp_state {
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};
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struct ssp_dev {
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struct ssp_device *ssp;
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u32 port;
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u32 mode;
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u32 flags;
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@ -50,4 +78,6 @@ int ssp_init(struct ssp_dev *dev, u32 port, u32 init_flags);
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int ssp_config(struct ssp_dev *dev, u32 mode, u32 flags, u32 psp_flags, u32 speed);
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void ssp_exit(struct ssp_dev *dev);
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#endif
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struct ssp_device *ssp_request(int port, const char *label);
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void ssp_free(struct ssp_device *);
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#endif /* __ASM_ARCH_SSP_H */
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