293 lines
6.7 KiB
C
293 lines
6.7 KiB
C
/*
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* linux/arch/arm/mach-pxa/ssp.c
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*
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* based on linux/arch/arm/mach-sa1100/ssp.c by Russell King
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*
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* Copyright (C) 2003 Russell King.
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* Copyright (C) 2003 Wolfson Microelectronics PLC
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* PXA2xx SSP driver. This provides the generic core for simple
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* IO-based SSP applications and allows easy port setup for DMA access.
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*
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* Author: Liam Girdwood <liam.girdwood@wolfsonmicro.com>
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/errno.h>
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#include <linux/interrupt.h>
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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 <linux/spi/pxa2xx_spi.h>
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#include <linux/io.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <asm/irq.h>
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#include <mach/hardware.h>
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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 *pxa_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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mutex_unlock(&ssp_lock);
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if (&ssp->node == &ssp_list)
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return NULL;
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return ssp;
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}
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EXPORT_SYMBOL(pxa_ssp_request);
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struct ssp_device *pxa_ssp_request_of(const struct device_node *of_node,
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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->of_node == of_node && 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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mutex_unlock(&ssp_lock);
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if (&ssp->node == &ssp_list)
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return NULL;
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return ssp;
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}
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EXPORT_SYMBOL(pxa_ssp_request_of);
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void pxa_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(pxa_ssp_free);
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#ifdef CONFIG_OF
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static const struct of_device_id pxa_ssp_of_ids[] = {
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{ .compatible = "mrvl,pxa25x-ssp", .data = (void *) PXA25x_SSP },
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{ .compatible = "mvrl,pxa25x-nssp", .data = (void *) PXA25x_NSSP },
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{ .compatible = "mrvl,pxa27x-ssp", .data = (void *) PXA27x_SSP },
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{ .compatible = "mrvl,pxa3xx-ssp", .data = (void *) PXA3xx_SSP },
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{ .compatible = "mvrl,pxa168-ssp", .data = (void *) PXA168_SSP },
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{ .compatible = "mrvl,pxa910-ssp", .data = (void *) PXA910_SSP },
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{ .compatible = "mrvl,ce4100-ssp", .data = (void *) CE4100_SSP },
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{ .compatible = "mrvl,lpss-ssp", .data = (void *) LPSS_SSP },
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{ },
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};
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MODULE_DEVICE_TABLE(of, pxa_ssp_of_ids);
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#endif
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static int pxa_ssp_probe(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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struct device *dev = &pdev->dev;
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ssp = devm_kzalloc(dev, sizeof(struct ssp_device), GFP_KERNEL);
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if (ssp == NULL)
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return -ENOMEM;
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ssp->pdev = pdev;
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ssp->clk = devm_clk_get(dev, NULL);
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if (IS_ERR(ssp->clk))
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return PTR_ERR(ssp->clk);
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if (dev->of_node) {
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struct of_phandle_args dma_spec;
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struct device_node *np = dev->of_node;
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int ret;
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/*
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* FIXME: we should allocate the DMA channel from this
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* context and pass the channel down to the ssp users.
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* For now, we lookup the rx and tx indices manually
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*/
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/* rx */
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ret = of_parse_phandle_with_args(np, "dmas", "#dma-cells",
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0, &dma_spec);
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if (ret) {
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dev_err(dev, "Can't parse dmas property\n");
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return -ENODEV;
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}
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ssp->drcmr_rx = dma_spec.args[0];
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of_node_put(dma_spec.np);
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/* tx */
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ret = of_parse_phandle_with_args(np, "dmas", "#dma-cells",
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1, &dma_spec);
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if (ret) {
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dev_err(dev, "Can't parse dmas property\n");
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return -ENODEV;
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}
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ssp->drcmr_tx = dma_spec.args[0];
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of_node_put(dma_spec.np);
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} else {
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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(dev, "no SSP RX DRCMR defined\n");
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return -ENODEV;
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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(dev, "no SSP TX DRCMR defined\n");
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return -ENODEV;
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}
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ssp->drcmr_tx = res->start;
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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(dev, "no memory resource defined\n");
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return -ENODEV;
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}
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res = devm_request_mem_region(dev, res->start, resource_size(res),
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pdev->name);
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if (res == NULL) {
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dev_err(dev, "failed to request memory resource\n");
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return -EBUSY;
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}
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ssp->phys_base = res->start;
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ssp->mmio_base = devm_ioremap(dev, res->start, resource_size(res));
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if (ssp->mmio_base == NULL) {
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dev_err(dev, "failed to ioremap() registers\n");
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return -ENODEV;
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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(dev, "no IRQ resource defined\n");
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return -ENODEV;
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}
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if (dev->of_node) {
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const struct of_device_id *id =
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of_match_device(of_match_ptr(pxa_ssp_of_ids), dev);
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ssp->type = (int) id->data;
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} else {
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const struct platform_device_id *id =
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platform_get_device_id(pdev);
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ssp->type = (int) id->driver_data;
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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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}
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ssp->use_count = 0;
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ssp->of_node = dev->of_node;
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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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}
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static int pxa_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, resource_size(res));
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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 const struct platform_device_id ssp_id_table[] = {
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{ "pxa25x-ssp", PXA25x_SSP },
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{ "pxa25x-nssp", PXA25x_NSSP },
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{ "pxa27x-ssp", PXA27x_SSP },
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{ "pxa168-ssp", PXA168_SSP },
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{ "pxa910-ssp", PXA910_SSP },
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{ },
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};
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static struct platform_driver pxa_ssp_driver = {
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.probe = pxa_ssp_probe,
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.remove = pxa_ssp_remove,
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.driver = {
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.owner = THIS_MODULE,
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.name = "pxa2xx-ssp",
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.of_match_table = of_match_ptr(pxa_ssp_of_ids),
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},
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.id_table = ssp_id_table,
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};
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static int __init pxa_ssp_init(void)
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{
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return platform_driver_register(&pxa_ssp_driver);
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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(&pxa_ssp_driver);
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}
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arch_initcall(pxa_ssp_init);
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module_exit(pxa_ssp_exit);
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MODULE_DESCRIPTION("PXA SSP driver");
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MODULE_AUTHOR("Liam Girdwood");
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MODULE_LICENSE("GPL");
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