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linux/sound/arm/pxa2xx-ac97-lib.c
Arnd Bergmann 8ff064521f ASoC: pxa: ac97: use normal MMIO accessors 
To avoid dereferencing hardwired constant pointers from a global header
file, change the driver to use devm_platform_ioremap_resource for getting
an __iomem pointer, and then using readl/writel on that.

Each pointer dereference gets changed by a search&replace, which leads
to a few overlong lines, but seems less risky than trying to clean up
the code at the same time.

Cc: alsa-devel@alsa-project.org
Acked-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
2022-05-07 22:55:49 +02:00

467 lines
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// SPDX-License-Identifier: GPL-2.0-only
/*
* Based on sound/arm/pxa2xx-ac97.c and sound/soc/pxa/pxa2xx-ac97.c
* which contain:
*
* Author: Nicolas Pitre
* Created: Dec 02, 2004
* Copyright: MontaVista Software Inc.
*/
#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/interrupt.h>
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/io.h>
#include <linux/gpio.h>
#include <linux/of_gpio.h>
#include <linux/soc/pxa/cpu.h>
#include <sound/pxa2xx-lib.h>
#include <linux/platform_data/asoc-pxa.h>
#include "pxa2xx-ac97-regs.h"
static DEFINE_MUTEX(car_mutex);
static DECLARE_WAIT_QUEUE_HEAD(gsr_wq);
static volatile long gsr_bits;
static struct clk *ac97_clk;
static struct clk *ac97conf_clk;
static int reset_gpio;
static void __iomem *ac97_reg_base;
extern void pxa27x_configure_ac97reset(int reset_gpio, bool to_gpio);
/*
* Beware PXA27x bugs:
*
* o Slot 12 read from modem space will hang controller.
* o CDONE, SDONE interrupt fails after any slot 12 IO.
*
* We therefore have an hybrid approach for waiting on SDONE (interrupt or
* 1 jiffy timeout if interrupt never comes).
*/
int pxa2xx_ac97_read(int slot, unsigned short reg)
{
int val = -ENODEV;
u32 __iomem *reg_addr;
if (slot > 0)
return -ENODEV;
mutex_lock(&car_mutex);
/* set up primary or secondary codec space */
if (cpu_is_pxa25x() && reg == AC97_GPIO_STATUS)
reg_addr = ac97_reg_base +
(slot ? SMC_REG_BASE : PMC_REG_BASE);
else
reg_addr = ac97_reg_base +
(slot ? SAC_REG_BASE : PAC_REG_BASE);
reg_addr += (reg >> 1);
/* start read access across the ac97 link */
writel(GSR_CDONE | GSR_SDONE, ac97_reg_base + GSR);
gsr_bits = 0;
val = (readl(reg_addr) & 0xffff);
if (reg == AC97_GPIO_STATUS)
goto out;
if (wait_event_timeout(gsr_wq, (readl(ac97_reg_base + GSR) | gsr_bits) & GSR_SDONE, 1) <= 0 &&
!((readl(ac97_reg_base + GSR) | gsr_bits) & GSR_SDONE)) {
printk(KERN_ERR "%s: read error (ac97_reg=%d GSR=%#lx)\n",
__func__, reg, readl(ac97_reg_base + GSR) | gsr_bits);
val = -ETIMEDOUT;
goto out;
}
/* valid data now */
writel(GSR_CDONE | GSR_SDONE, ac97_reg_base + GSR);
gsr_bits = 0;
val = (readl(reg_addr) & 0xffff);
/* but we've just started another cycle... */
wait_event_timeout(gsr_wq, (readl(ac97_reg_base + GSR) | gsr_bits) & GSR_SDONE, 1);
out: mutex_unlock(&car_mutex);
return val;
}
EXPORT_SYMBOL_GPL(pxa2xx_ac97_read);
int pxa2xx_ac97_write(int slot, unsigned short reg, unsigned short val)
{
u32 __iomem *reg_addr;
int ret = 0;
mutex_lock(&car_mutex);
/* set up primary or secondary codec space */
if (cpu_is_pxa25x() && reg == AC97_GPIO_STATUS)
reg_addr = ac97_reg_base +
(slot ? SMC_REG_BASE : PMC_REG_BASE);
else
reg_addr = ac97_reg_base +
(slot ? SAC_REG_BASE : PAC_REG_BASE);
reg_addr += (reg >> 1);
writel(GSR_CDONE | GSR_SDONE, ac97_reg_base + GSR);
gsr_bits = 0;
writel(val, reg_addr);
if (wait_event_timeout(gsr_wq, (readl(ac97_reg_base + GSR) | gsr_bits) & GSR_CDONE, 1) <= 0 &&
!((readl(ac97_reg_base + GSR) | gsr_bits) & GSR_CDONE)) {
printk(KERN_ERR "%s: write error (ac97_reg=%d GSR=%#lx)\n",
__func__, reg, readl(ac97_reg_base + GSR) | gsr_bits);
ret = -EIO;
}
mutex_unlock(&car_mutex);
return ret;
}
EXPORT_SYMBOL_GPL(pxa2xx_ac97_write);
#ifdef CONFIG_PXA25x
static inline void pxa_ac97_warm_pxa25x(void)
{
gsr_bits = 0;
writel(readl(ac97_reg_base + GCR) | (GCR_WARM_RST), ac97_reg_base + GCR);
}
static inline void pxa_ac97_cold_pxa25x(void)
{
writel(readl(ac97_reg_base + GCR) & ( GCR_COLD_RST), ac97_reg_base + GCR); /* clear everything but nCRST */
writel(readl(ac97_reg_base + GCR) & (~GCR_COLD_RST), ac97_reg_base + GCR); /* then assert nCRST */
gsr_bits = 0;
writel(GCR_COLD_RST, ac97_reg_base + GCR);
}
#endif
#ifdef CONFIG_PXA27x
static inline void pxa_ac97_warm_pxa27x(void)
{
gsr_bits = 0;
/* warm reset broken on Bulverde, so manually keep AC97 reset high */
pxa27x_configure_ac97reset(reset_gpio, true);
udelay(10);
writel(readl(ac97_reg_base + GCR) | (GCR_WARM_RST), ac97_reg_base + GCR);
pxa27x_configure_ac97reset(reset_gpio, false);
udelay(500);
}
static inline void pxa_ac97_cold_pxa27x(void)
{
writel(readl(ac97_reg_base + GCR) & ( GCR_COLD_RST), ac97_reg_base + GCR); /* clear everything but nCRST */
writel(readl(ac97_reg_base + GCR) & (~GCR_COLD_RST), ac97_reg_base + GCR); /* then assert nCRST */
gsr_bits = 0;
/* PXA27x Developers Manual section 13.5.2.2.1 */
clk_prepare_enable(ac97conf_clk);
udelay(5);
clk_disable_unprepare(ac97conf_clk);
writel(GCR_COLD_RST | GCR_WARM_RST, ac97_reg_base + GCR);
}
#endif
#ifdef CONFIG_PXA3xx
static inline void pxa_ac97_warm_pxa3xx(void)
{
gsr_bits = 0;
/* Can't use interrupts */
writel(readl(ac97_reg_base + GCR) | (GCR_WARM_RST), ac97_reg_base + GCR);
}
static inline void pxa_ac97_cold_pxa3xx(void)
{
/* Hold CLKBPB for 100us */
writel(0, ac97_reg_base + GCR);
writel(GCR_CLKBPB, ac97_reg_base + GCR);
udelay(100);
writel(0, ac97_reg_base + GCR);
writel(readl(ac97_reg_base + GCR) & ( GCR_COLD_RST), ac97_reg_base + GCR); /* clear everything but nCRST */
writel(readl(ac97_reg_base + GCR) & (~GCR_COLD_RST), ac97_reg_base + GCR); /* then assert nCRST */
gsr_bits = 0;
/* Can't use interrupts on PXA3xx */
writel(readl(ac97_reg_base + GCR) & (~(GCR_PRIRDY_IEN|GCR_SECRDY_IEN)), ac97_reg_base + GCR);
writel(GCR_WARM_RST | GCR_COLD_RST, ac97_reg_base + GCR);
}
#endif
bool pxa2xx_ac97_try_warm_reset(void)
{
unsigned long gsr;
unsigned int timeout = 100;
#ifdef CONFIG_PXA25x
if (cpu_is_pxa25x())
pxa_ac97_warm_pxa25x();
else
#endif
#ifdef CONFIG_PXA27x
if (cpu_is_pxa27x())
pxa_ac97_warm_pxa27x();
else
#endif
#ifdef CONFIG_PXA3xx
if (cpu_is_pxa3xx())
pxa_ac97_warm_pxa3xx();
else
#endif
snd_BUG();
while (!((readl(ac97_reg_base + GSR) | gsr_bits) & (GSR_PCR | GSR_SCR)) && timeout--)
mdelay(1);
gsr = readl(ac97_reg_base + GSR) | gsr_bits;
if (!(gsr & (GSR_PCR | GSR_SCR))) {
printk(KERN_INFO "%s: warm reset timeout (GSR=%#lx)\n",
__func__, gsr);
return false;
}
return true;
}
EXPORT_SYMBOL_GPL(pxa2xx_ac97_try_warm_reset);
bool pxa2xx_ac97_try_cold_reset(void)
{
unsigned long gsr;
unsigned int timeout = 1000;
#ifdef CONFIG_PXA25x
if (cpu_is_pxa25x())
pxa_ac97_cold_pxa25x();
else
#endif
#ifdef CONFIG_PXA27x
if (cpu_is_pxa27x())
pxa_ac97_cold_pxa27x();
else
#endif
#ifdef CONFIG_PXA3xx
if (cpu_is_pxa3xx())
pxa_ac97_cold_pxa3xx();
else
#endif
snd_BUG();
while (!((readl(ac97_reg_base + GSR) | gsr_bits) & (GSR_PCR | GSR_SCR)) && timeout--)
mdelay(1);
gsr = readl(ac97_reg_base + GSR) | gsr_bits;
if (!(gsr & (GSR_PCR | GSR_SCR))) {
printk(KERN_INFO "%s: cold reset timeout (GSR=%#lx)\n",
__func__, gsr);
return false;
}
return true;
}
EXPORT_SYMBOL_GPL(pxa2xx_ac97_try_cold_reset);
void pxa2xx_ac97_finish_reset(void)
{
u32 gcr = readl(ac97_reg_base + GCR);
gcr &= ~(GCR_PRIRDY_IEN|GCR_SECRDY_IEN);
gcr |= GCR_SDONE_IE|GCR_CDONE_IE;
writel(gcr, ac97_reg_base + GCR);
}
EXPORT_SYMBOL_GPL(pxa2xx_ac97_finish_reset);
static irqreturn_t pxa2xx_ac97_irq(int irq, void *dev_id)
{
long status;
status = readl(ac97_reg_base + GSR);
if (status) {
writel(status, ac97_reg_base + GSR);
gsr_bits |= status;
wake_up(&gsr_wq);
/* Although we don't use those we still need to clear them
since they tend to spuriously trigger when MMC is used
(hardware bug? go figure)... */
if (cpu_is_pxa27x()) {
writel(MISR_EOC, ac97_reg_base + MISR);
writel(PISR_EOC, ac97_reg_base + PISR);
writel(MCSR_EOC, ac97_reg_base + MCSR);
}
return IRQ_HANDLED;
}
return IRQ_NONE;
}
#ifdef CONFIG_PM
int pxa2xx_ac97_hw_suspend(void)
{
writel(readl(ac97_reg_base + GCR) | (GCR_ACLINK_OFF), ac97_reg_base + GCR);
clk_disable_unprepare(ac97_clk);
return 0;
}
EXPORT_SYMBOL_GPL(pxa2xx_ac97_hw_suspend);
int pxa2xx_ac97_hw_resume(void)
{
clk_prepare_enable(ac97_clk);
return 0;
}
EXPORT_SYMBOL_GPL(pxa2xx_ac97_hw_resume);
#endif
int pxa2xx_ac97_hw_probe(struct platform_device *dev)
{
int ret;
int irq;
pxa2xx_audio_ops_t *pdata = dev->dev.platform_data;
ac97_reg_base = devm_platform_ioremap_resource(dev, 0);
if (IS_ERR(ac97_reg_base)) {
dev_err(&dev->dev, "Missing MMIO resource\n");
return PTR_ERR(ac97_reg_base);
}
if (pdata) {
switch (pdata->reset_gpio) {
case 95:
case 113:
reset_gpio = pdata->reset_gpio;
break;
case 0:
reset_gpio = 113;
break;
case -1:
break;
default:
dev_err(&dev->dev, "Invalid reset GPIO %d\n",
pdata->reset_gpio);
}
} else if (!pdata && dev->dev.of_node) {
pdata = devm_kzalloc(&dev->dev, sizeof(*pdata), GFP_KERNEL);
if (!pdata)
return -ENOMEM;
pdata->reset_gpio = of_get_named_gpio(dev->dev.of_node,
"reset-gpios", 0);
if (pdata->reset_gpio == -ENOENT)
pdata->reset_gpio = -1;
else if (pdata->reset_gpio < 0)
return pdata->reset_gpio;
reset_gpio = pdata->reset_gpio;
} else {
if (cpu_is_pxa27x())
reset_gpio = 113;
}
if (cpu_is_pxa27x()) {
/*
* This gpio is needed for a work-around to a bug in the ac97
* controller during warm reset. The direction and level is set
* here so that it is an output driven high when switching from
* AC97_nRESET alt function to generic gpio.
*/
ret = gpio_request_one(reset_gpio, GPIOF_OUT_INIT_HIGH,
"pxa27x ac97 reset");
if (ret < 0) {
pr_err("%s: gpio_request_one() failed: %d\n",
__func__, ret);
goto err_conf;
}
pxa27x_configure_ac97reset(reset_gpio, false);
ac97conf_clk = clk_get(&dev->dev, "AC97CONFCLK");
if (IS_ERR(ac97conf_clk)) {
ret = PTR_ERR(ac97conf_clk);
ac97conf_clk = NULL;
goto err_conf;
}
}
ac97_clk = clk_get(&dev->dev, "AC97CLK");
if (IS_ERR(ac97_clk)) {
ret = PTR_ERR(ac97_clk);
ac97_clk = NULL;
goto err_clk;
}
ret = clk_prepare_enable(ac97_clk);
if (ret)
goto err_clk2;
irq = platform_get_irq(dev, 0);
if (!irq)
goto err_irq;
ret = request_irq(irq, pxa2xx_ac97_irq, 0, "AC97", NULL);
if (ret < 0)
goto err_irq;
return 0;
err_irq:
writel(readl(ac97_reg_base + GCR) | (GCR_ACLINK_OFF), ac97_reg_base + GCR);
err_clk2:
clk_put(ac97_clk);
ac97_clk = NULL;
err_clk:
if (ac97conf_clk) {
clk_put(ac97conf_clk);
ac97conf_clk = NULL;
}
err_conf:
return ret;
}
EXPORT_SYMBOL_GPL(pxa2xx_ac97_hw_probe);
void pxa2xx_ac97_hw_remove(struct platform_device *dev)
{
if (cpu_is_pxa27x())
gpio_free(reset_gpio);
writel(readl(ac97_reg_base + GCR) | (GCR_ACLINK_OFF), ac97_reg_base + GCR);
free_irq(platform_get_irq(dev, 0), NULL);
if (ac97conf_clk) {
clk_put(ac97conf_clk);
ac97conf_clk = NULL;
}
clk_disable_unprepare(ac97_clk);
clk_put(ac97_clk);
ac97_clk = NULL;
}
EXPORT_SYMBOL_GPL(pxa2xx_ac97_hw_remove);
u32 pxa2xx_ac97_read_modr(void)
{
if (!ac97_reg_base)
return 0;
return readl(ac97_reg_base + MODR);
}
EXPORT_SYMBOL_GPL(pxa2xx_ac97_read_modr);
u32 pxa2xx_ac97_read_misr(void)
{
if (!ac97_reg_base)
return 0;
return readl(ac97_reg_base + MISR);
}
EXPORT_SYMBOL_GPL(pxa2xx_ac97_read_misr);
MODULE_AUTHOR("Nicolas Pitre");
MODULE_DESCRIPTION("Intel/Marvell PXA sound library");
MODULE_LICENSE("GPL");
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