![Jochen Friedrich](/assets/img/avatar_default.png)
Make use of memory resources rather than hardcoded IO adresses. This is a first step towards DT support. Signed-off-by: Jochen Friedrich <jochen@scram.de> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
326 lines
7.7 KiB
C
326 lines
7.7 KiB
C
/*
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* linux/drivers/mfd/mcp-sa11x0.c
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*
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* Copyright (C) 2001-2005 Russell King
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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 as published by
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* the Free Software Foundation; either version 2 of the License.
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*
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* SA11x0 MCP (Multimedia Communications Port) driver.
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*
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* MCP read/write timeouts from Jordi Colomer, rehacked by rmk.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/delay.h>
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#include <linux/spinlock.h>
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#include <linux/platform_device.h>
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#include <linux/mfd/mcp.h>
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#include <linux/io.h>
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#include <mach/dma.h>
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#include <mach/hardware.h>
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#include <asm/mach-types.h>
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#include <asm/system.h>
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#include <mach/mcp.h>
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/* Register offsets */
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#define MCCR0 0x00
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#define MCDR0 0x08
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#define MCDR1 0x0C
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#define MCDR2 0x10
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#define MCSR 0x18
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#define MCCR1 0x00
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struct mcp_sa11x0 {
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u32 mccr0;
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u32 mccr1;
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unsigned char *mccr0_base;
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unsigned char *mccr1_base;
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};
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#define priv(mcp) ((struct mcp_sa11x0 *)mcp_priv(mcp))
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static void
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mcp_sa11x0_set_telecom_divisor(struct mcp *mcp, unsigned int divisor)
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{
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struct mcp_sa11x0 *priv = priv(mcp);
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divisor /= 32;
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priv->mccr0 &= ~0x00007f00;
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priv->mccr0 |= divisor << 8;
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__raw_writel(priv->mccr0, priv->mccr0_base + MCCR0);
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}
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static void
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mcp_sa11x0_set_audio_divisor(struct mcp *mcp, unsigned int divisor)
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{
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struct mcp_sa11x0 *priv = priv(mcp);
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divisor /= 32;
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priv->mccr0 &= ~0x0000007f;
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priv->mccr0 |= divisor;
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__raw_writel(priv->mccr0, priv->mccr0_base + MCCR0);
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}
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/*
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* Write data to the device. The bit should be set after 3 subframe
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* times (each frame is 64 clocks). We wait a maximum of 6 subframes.
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* We really should try doing something more productive while we
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* wait.
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*/
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static void
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mcp_sa11x0_write(struct mcp *mcp, unsigned int reg, unsigned int val)
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{
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int ret = -ETIME;
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int i;
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u32 mcpreg;
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struct mcp_sa11x0 *priv = priv(mcp);
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mcpreg = reg << 17 | MCDR2_Wr | (val & 0xffff);
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__raw_writel(mcpreg, priv->mccr0_base + MCDR2);
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for (i = 0; i < 2; i++) {
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udelay(mcp->rw_timeout);
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mcpreg = __raw_readl(priv->mccr0_base + MCSR);
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if (mcpreg & MCSR_CWC) {
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ret = 0;
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break;
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}
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}
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if (ret < 0)
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printk(KERN_WARNING "mcp: write timed out\n");
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}
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/*
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* Read data from the device. The bit should be set after 3 subframe
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* times (each frame is 64 clocks). We wait a maximum of 6 subframes.
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* We really should try doing something more productive while we
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* wait.
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*/
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static unsigned int
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mcp_sa11x0_read(struct mcp *mcp, unsigned int reg)
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{
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int ret = -ETIME;
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int i;
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u32 mcpreg;
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struct mcp_sa11x0 *priv = priv(mcp);
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mcpreg = reg << 17 | MCDR2_Rd;
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__raw_writel(mcpreg, priv->mccr0_base + MCDR2);
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for (i = 0; i < 2; i++) {
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udelay(mcp->rw_timeout);
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mcpreg = __raw_readl(priv->mccr0_base + MCSR);
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if (mcpreg & MCSR_CRC) {
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ret = __raw_readl(priv->mccr0_base + MCDR2)
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& 0xffff;
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break;
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}
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}
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if (ret < 0)
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printk(KERN_WARNING "mcp: read timed out\n");
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return ret;
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}
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static void mcp_sa11x0_enable(struct mcp *mcp)
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{
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struct mcp_sa11x0 *priv = priv(mcp);
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__raw_writel(-1, priv->mccr0_base + MCSR);
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priv->mccr0 |= MCCR0_MCE;
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__raw_writel(priv->mccr0, priv->mccr0_base + MCCR0);
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}
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static void mcp_sa11x0_disable(struct mcp *mcp)
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{
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struct mcp_sa11x0 *priv = priv(mcp);
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priv->mccr0 &= ~MCCR0_MCE;
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__raw_writel(priv->mccr0, priv->mccr0_base + MCCR0);
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}
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/*
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* Our methods.
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*/
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static struct mcp_ops mcp_sa11x0 = {
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.set_telecom_divisor = mcp_sa11x0_set_telecom_divisor,
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.set_audio_divisor = mcp_sa11x0_set_audio_divisor,
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.reg_write = mcp_sa11x0_write,
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.reg_read = mcp_sa11x0_read,
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.enable = mcp_sa11x0_enable,
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.disable = mcp_sa11x0_disable,
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};
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static int mcp_sa11x0_probe(struct platform_device *pdev)
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{
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struct mcp_plat_data *data = pdev->dev.platform_data;
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struct mcp *mcp;
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int ret;
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struct mcp_sa11x0 *priv;
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struct resource *res_mem0, *res_mem1;
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u32 size0, size1;
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if (!data)
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return -ENODEV;
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if (!data->codec)
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return -ENODEV;
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res_mem0 = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!res_mem0)
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return -ENODEV;
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size0 = res_mem0->end - res_mem0->start + 1;
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res_mem1 = platform_get_resource(pdev, IORESOURCE_MEM, 1);
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if (!res_mem1)
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return -ENODEV;
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size1 = res_mem1->end - res_mem1->start + 1;
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if (!request_mem_region(res_mem0->start, size0, "sa11x0-mcp"))
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return -EBUSY;
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if (!request_mem_region(res_mem1->start, size1, "sa11x0-mcp")) {
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ret = -EBUSY;
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goto release;
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}
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mcp = mcp_host_alloc(&pdev->dev, sizeof(struct mcp_sa11x0));
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if (!mcp) {
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ret = -ENOMEM;
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goto release2;
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}
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priv = priv(mcp);
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mcp->owner = THIS_MODULE;
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mcp->ops = &mcp_sa11x0;
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mcp->sclk_rate = data->sclk_rate;
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mcp->dma_audio_rd = DDAR_DevAdd(res_mem0->start + MCDR0)
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+ DDAR_DevRd + DDAR_Brst4 + DDAR_8BitDev;
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mcp->dma_audio_wr = DDAR_DevAdd(res_mem0->start + MCDR0)
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+ DDAR_DevWr + DDAR_Brst4 + DDAR_8BitDev;
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mcp->dma_telco_rd = DDAR_DevAdd(res_mem0->start + MCDR1)
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+ DDAR_DevRd + DDAR_Brst4 + DDAR_8BitDev;
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mcp->dma_telco_wr = DDAR_DevAdd(res_mem0->start + MCDR1)
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+ DDAR_DevWr + DDAR_Brst4 + DDAR_8BitDev;
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mcp->codec = data->codec;
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platform_set_drvdata(pdev, mcp);
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/*
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* Initialise device. Note that we initially
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* set the sampling rate to minimum.
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*/
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priv->mccr0_base = ioremap(res_mem0->start, size0);
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priv->mccr1_base = ioremap(res_mem1->start, size1);
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__raw_writel(-1, priv->mccr0_base + MCSR);
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priv->mccr1 = data->mccr1;
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priv->mccr0 = data->mccr0 | 0x7f7f;
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__raw_writel(priv->mccr0, priv->mccr0_base + MCCR0);
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__raw_writel(priv->mccr1, priv->mccr1_base + MCCR1);
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/*
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* Calculate the read/write timeout (us) from the bit clock
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* rate. This is the period for 3 64-bit frames. Always
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* round this time up.
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*/
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mcp->rw_timeout = (64 * 3 * 1000000 + mcp->sclk_rate - 1) /
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mcp->sclk_rate;
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ret = mcp_host_register(mcp, data->codec_pdata);
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if (ret == 0)
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goto out;
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release2:
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release_mem_region(res_mem1->start, size1);
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release:
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release_mem_region(res_mem0->start, size0);
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platform_set_drvdata(pdev, NULL);
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out:
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return ret;
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}
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static int mcp_sa11x0_remove(struct platform_device *pdev)
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{
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struct mcp *mcp = platform_get_drvdata(pdev);
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struct mcp_sa11x0 *priv = priv(mcp);
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struct resource *res_mem;
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u32 size;
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platform_set_drvdata(pdev, NULL);
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mcp_host_unregister(mcp);
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res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (res_mem) {
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size = res_mem->end - res_mem->start + 1;
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release_mem_region(res_mem->start, size);
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}
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res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 1);
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if (res_mem) {
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size = res_mem->end - res_mem->start + 1;
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release_mem_region(res_mem->start, size);
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}
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iounmap(priv->mccr0_base);
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iounmap(priv->mccr1_base);
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return 0;
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}
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static int mcp_sa11x0_suspend(struct platform_device *dev, pm_message_t state)
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{
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struct mcp *mcp = platform_get_drvdata(dev);
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struct mcp_sa11x0 *priv = priv(mcp);
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u32 mccr0;
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mccr0 = priv->mccr0 & ~MCCR0_MCE;
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__raw_writel(mccr0, priv->mccr0_base + MCCR0);
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return 0;
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}
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static int mcp_sa11x0_resume(struct platform_device *dev)
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{
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struct mcp *mcp = platform_get_drvdata(dev);
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struct mcp_sa11x0 *priv = priv(mcp);
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__raw_writel(priv->mccr0, priv->mccr0_base + MCCR0);
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__raw_writel(priv->mccr1, priv->mccr1_base + MCCR1);
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return 0;
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}
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/*
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* The driver for the SA11x0 MCP port.
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*/
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MODULE_ALIAS("platform:sa11x0-mcp");
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static struct platform_driver mcp_sa11x0_driver = {
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.probe = mcp_sa11x0_probe,
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.remove = mcp_sa11x0_remove,
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.suspend = mcp_sa11x0_suspend,
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.resume = mcp_sa11x0_resume,
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.driver = {
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.name = "sa11x0-mcp",
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.owner = THIS_MODULE,
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},
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};
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/*
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* This needs re-working
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*/
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module_platform_driver(mcp_sa11x0_driver);
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MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
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MODULE_DESCRIPTION("SA11x0 multimedia communications port driver");
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MODULE_LICENSE("GPL");
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