drivers/pcmcia/pxa2xx_base.c - kernel/msm - Gitiles

 /*======================================================================

   Device driver for the PCMCIA control functionality of PXA2xx
   microprocessors.

     The contents of this file may be used under the
     terms of the GNU Public License version 2 (the "GPL")

     (c) Ian Molton (spyro@f2s.com) 2003
     (c) Stefan Eletzhofer (stefan.eletzhofer@inquant.de) 2003,4

     derived from sa11xx_base.c

      Portions created by John G. Dorsey are
      Copyright (C) 1999 John G. Dorsey.

   ======================================================================*/

 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/config.h>
 #include <linux/cpufreq.h>
 #include <linux/ioport.h>
 #include <linux/kernel.h>
 #include <linux/spinlock.h>

 #include <asm/hardware.h>
 #include <asm/io.h>
 #include <asm/irq.h>
 #include <asm/system.h>
 #include <asm/arch/pxa-regs.h>

 #include <pcmcia/cs_types.h>
 #include <pcmcia/ss.h>
 #include <pcmcia/bulkmem.h>
 #include <pcmcia/cistpl.h>

 #include "cs_internal.h"
 #include "soc_common.h"
 #include "pxa2xx_base.h"


 #define MCXX_SETUP_MASK     (0x7f)
 #define MCXX_ASST_MASK      (0x1f)
 #define MCXX_HOLD_MASK      (0x3f)
 #define MCXX_SETUP_SHIFT    (0)
 #define MCXX_ASST_SHIFT     (7)
 #define MCXX_HOLD_SHIFT     (14)

 static inline u_int pxa2xx_mcxx_hold(u_int pcmcia_cycle_ns,
 				     u_int mem_clk_10khz)
 {
 	u_int code = pcmcia_cycle_ns * mem_clk_10khz;
 	return (code / 300000) + ((code % 300000) ? 1 : 0) - 1;
 }

 static inline u_int pxa2xx_mcxx_asst(u_int pcmcia_cycle_ns,
 				     u_int mem_clk_10khz)
 {
 	u_int code = pcmcia_cycle_ns * mem_clk_10khz;
 	return (code / 300000) + ((code % 300000) ? 1 : 0) - 1;
 }

 static inline u_int pxa2xx_mcxx_setup(u_int pcmcia_cycle_ns,
 				      u_int mem_clk_10khz)
 {
 	u_int code = pcmcia_cycle_ns * mem_clk_10khz;
 	return (code / 100000) + ((code % 100000) ? 1 : 0) - 1;
 }

 /* This function returns the (approximate) command assertion period, in
  * nanoseconds, for a given CPU clock frequency and MCXX_ASST value:
  */
 static inline u_int pxa2xx_pcmcia_cmd_time(u_int mem_clk_10khz,
 					   u_int pcmcia_mcxx_asst)
 {
 	return (300000 * (pcmcia_mcxx_asst + 1) / mem_clk_10khz);
 }

 static int pxa2xx_pcmcia_set_mcmem( int sock, int speed, int clock )
 {
 	MCMEM(sock) = ((pxa2xx_mcxx_setup(speed, clock)
 		& MCXX_SETUP_MASK) << MCXX_SETUP_SHIFT)
 		| ((pxa2xx_mcxx_asst(speed, clock)
 		& MCXX_ASST_MASK) << MCXX_ASST_SHIFT)
 		| ((pxa2xx_mcxx_hold(speed, clock)
 		& MCXX_HOLD_MASK) << MCXX_HOLD_SHIFT);

 	return 0;
 }

 static int pxa2xx_pcmcia_set_mcio( int sock, int speed, int clock )
 {
 	MCIO(sock) = ((pxa2xx_mcxx_setup(speed, clock)
 		& MCXX_SETUP_MASK) << MCXX_SETUP_SHIFT)
 		| ((pxa2xx_mcxx_asst(speed, clock)
 		& MCXX_ASST_MASK) << MCXX_ASST_SHIFT)
 		| ((pxa2xx_mcxx_hold(speed, clock)
 		& MCXX_HOLD_MASK) << MCXX_HOLD_SHIFT);

 	return 0;
 }

 static int pxa2xx_pcmcia_set_mcatt( int sock, int speed, int clock )
 {
 	MCATT(sock) = ((pxa2xx_mcxx_setup(speed, clock)
 		& MCXX_SETUP_MASK) << MCXX_SETUP_SHIFT)
 		| ((pxa2xx_mcxx_asst(speed, clock)
 		& MCXX_ASST_MASK) << MCXX_ASST_SHIFT)
 		| ((pxa2xx_mcxx_hold(speed, clock)
 		& MCXX_HOLD_MASK) << MCXX_HOLD_SHIFT);

 	return 0;
 }

 static int pxa2xx_pcmcia_set_mcxx(struct soc_pcmcia_socket *skt, unsigned int clk)
 {
 	struct soc_pcmcia_timing timing;
 	int sock = skt->nr;

 	soc_common_pcmcia_get_timing(skt, &timing);

 	pxa2xx_pcmcia_set_mcmem(sock, timing.mem, clk);
 	pxa2xx_pcmcia_set_mcatt(sock, timing.attr, clk);
 	pxa2xx_pcmcia_set_mcio(sock, timing.io, clk);

 	return 0;
 }

 static int pxa2xx_pcmcia_set_timing(struct soc_pcmcia_socket *skt)
 {
 	unsigned int clk = get_memclk_frequency_10khz();
 	return pxa2xx_pcmcia_set_mcxx(skt, clk);
 }

 #ifdef CONFIG_CPU_FREQ

 static int
 pxa2xx_pcmcia_frequency_change(struct soc_pcmcia_socket *skt,
 			       unsigned long val,
 			       struct cpufreq_freqs *freqs)
 {
 #warning "it's not clear if this is right since the core CPU (N) clock has no effect on the memory (L) clock"
 	switch (val) {
 	case CPUFREQ_PRECHANGE:
 		if (freqs->new > freqs->old) {
 			debug(skt, 2, "new frequency %u.%uMHz > %u.%uMHz, "
 			       "pre-updating\n",
 			       freqs->new / 1000, (freqs->new / 100) % 10,
 			       freqs->old / 1000, (freqs->old / 100) % 10);
 			pxa2xx_pcmcia_set_mcxx(skt, freqs->new);
 		}
 		break;

 	case CPUFREQ_POSTCHANGE:
 		if (freqs->new < freqs->old) {
 			debug(skt, 2, "new frequency %u.%uMHz < %u.%uMHz, "
 			       "post-updating\n",
 			       freqs->new / 1000, (freqs->new / 100) % 10,
 			       freqs->old / 1000, (freqs->old / 100) % 10);
 			pxa2xx_pcmcia_set_mcxx(skt, freqs->new);
 		}
 		break;
 	}
 	return 0;
 }
 #endif

 int pxa2xx_drv_pcmcia_probe(struct device *dev)
 {
 	int ret;
 	struct pcmcia_low_level *ops;
 	int first, nr;

 	if (!dev || !dev->platform_data)
 		return -ENODEV;

 	ops = (struct pcmcia_low_level *)dev->platform_data;
 	first = ops->first;
 	nr = ops->nr;

 	/* Provide our PXA2xx specific timing routines. */
 	ops->set_timing  = pxa2xx_pcmcia_set_timing;
 #ifdef CONFIG_CPU_FREQ
 	ops->frequency_change = pxa2xx_pcmcia_frequency_change;
 #endif

 	ret = soc_common_drv_pcmcia_probe(dev, ops, first, nr);

 	if (ret == 0) {
 		/*
 		 * We have at least one socket, so set MECR:CIT
 		 * (Card Is There)
 		 */
 		MECR |= MECR_CIT;

 		/* Set MECR:NOS (Number Of Sockets) */
 		if (nr > 1)
 			MECR |= MECR_NOS;
 		else
 			MECR &= ~MECR_NOS;
 	}

 	return ret;
 }
 EXPORT_SYMBOL(pxa2xx_drv_pcmcia_probe);

 static int pxa2xx_drv_pcmcia_suspend(struct device *dev, u32 state, u32 level)
 {
 	int ret = 0;
 	if (level == SUSPEND_SAVE_STATE)
 		ret = pcmcia_socket_dev_suspend(dev, state);
 	return ret;
 }

 static int pxa2xx_drv_pcmcia_resume(struct device *dev, u32 level)
 {
 	int ret = 0;
 	if (level == RESUME_RESTORE_STATE)
 	{
 		struct pcmcia_low_level *ops = dev->platform_data;
 		int nr = ops ? ops->nr : 0;

 		MECR = nr > 1 ? MECR_CIT | MECR_NOS : (nr > 0 ? MECR_CIT : 0);
 		ret = pcmcia_socket_dev_resume(dev);
 	}
 	return ret;
 }

 static struct device_driver pxa2xx_pcmcia_driver = {
 	.probe		= pxa2xx_drv_pcmcia_probe,
 	.remove		= soc_common_drv_pcmcia_remove,
 	.suspend 	= pxa2xx_drv_pcmcia_suspend,
 	.resume 	= pxa2xx_drv_pcmcia_resume,
 	.name		= "pxa2xx-pcmcia",
 	.bus		= &platform_bus_type,
 };

 static int __init pxa2xx_pcmcia_init(void)
 {
 	return driver_register(&pxa2xx_pcmcia_driver);
 }

 static void __exit pxa2xx_pcmcia_exit(void)
 {
 	driver_unregister(&pxa2xx_pcmcia_driver);
 }

 module_init(pxa2xx_pcmcia_init);
 module_exit(pxa2xx_pcmcia_exit);

 MODULE_AUTHOR("Stefan Eletzhofer <stefan.eletzhofer@inquant.de> and Ian Molton <spyro@f2s.com>");
 MODULE_DESCRIPTION("Linux PCMCIA Card Services: PXA2xx core socket driver");
 MODULE_LICENSE("GPL");
	/*======================================================================

	Device driver for the PCMCIA control functionality of PXA2xx
	microprocessors.

	The contents of this file may be used under the
	terms of the GNU Public License version 2 (the "GPL")

	(c) Ian Molton (spyro@f2s.com) 2003
	(c) Stefan Eletzhofer (stefan.eletzhofer@inquant.de) 2003,4

	derived from sa11xx_base.c

	Portions created by John G. Dorsey are
	Copyright (C) 1999 John G. Dorsey.

	======================================================================*/

	#include <linux/module.h>
	#include <linux/init.h>
	#include <linux/config.h>
	#include <linux/cpufreq.h>
	#include <linux/ioport.h>
	#include <linux/kernel.h>
	#include <linux/spinlock.h>

	#include <asm/hardware.h>
	#include <asm/io.h>
	#include <asm/irq.h>
	#include <asm/system.h>
	#include <asm/arch/pxa-regs.h>

	#include <pcmcia/cs_types.h>
	#include <pcmcia/ss.h>
	#include <pcmcia/bulkmem.h>
	#include <pcmcia/cistpl.h>

	#include "cs_internal.h"
	#include "soc_common.h"
	#include "pxa2xx_base.h"


	#define MCXX_SETUP_MASK (0x7f)
	#define MCXX_ASST_MASK (0x1f)
	#define MCXX_HOLD_MASK (0x3f)
	#define MCXX_SETUP_SHIFT (0)
	#define MCXX_ASST_SHIFT (7)
	#define MCXX_HOLD_SHIFT (14)

	static inline u_int pxa2xx_mcxx_hold(u_int pcmcia_cycle_ns,
	u_int mem_clk_10khz)
	{
	u_int code = pcmcia_cycle_ns * mem_clk_10khz;
	return (code / 300000) + ((code % 300000) ? 1 : 0) - 1;
	}

	static inline u_int pxa2xx_mcxx_asst(u_int pcmcia_cycle_ns,
	u_int mem_clk_10khz)
	{
	u_int code = pcmcia_cycle_ns * mem_clk_10khz;
	return (code / 300000) + ((code % 300000) ? 1 : 0) - 1;
	}

	static inline u_int pxa2xx_mcxx_setup(u_int pcmcia_cycle_ns,
	u_int mem_clk_10khz)
	{
	u_int code = pcmcia_cycle_ns * mem_clk_10khz;
	return (code / 100000) + ((code % 100000) ? 1 : 0) - 1;
	}

	/* This function returns the (approximate) command assertion period, in
	* nanoseconds, for a given CPU clock frequency and MCXX_ASST value:
	*/
	static inline u_int pxa2xx_pcmcia_cmd_time(u_int mem_clk_10khz,
	u_int pcmcia_mcxx_asst)
	{
	return (300000 * (pcmcia_mcxx_asst + 1) / mem_clk_10khz);
	}

	static int pxa2xx_pcmcia_set_mcmem( int sock, int speed, int clock )
	{
	MCMEM(sock) = ((pxa2xx_mcxx_setup(speed, clock)
	& MCXX_SETUP_MASK) << MCXX_SETUP_SHIFT)
	\| ((pxa2xx_mcxx_asst(speed, clock)
	& MCXX_ASST_MASK) << MCXX_ASST_SHIFT)
	\| ((pxa2xx_mcxx_hold(speed, clock)
	& MCXX_HOLD_MASK) << MCXX_HOLD_SHIFT);

	return 0;
	}

	static int pxa2xx_pcmcia_set_mcio( int sock, int speed, int clock )
	{
	MCIO(sock) = ((pxa2xx_mcxx_setup(speed, clock)
	& MCXX_SETUP_MASK) << MCXX_SETUP_SHIFT)
	\| ((pxa2xx_mcxx_asst(speed, clock)
	& MCXX_ASST_MASK) << MCXX_ASST_SHIFT)
	\| ((pxa2xx_mcxx_hold(speed, clock)
	& MCXX_HOLD_MASK) << MCXX_HOLD_SHIFT);

	return 0;
	}

	static int pxa2xx_pcmcia_set_mcatt( int sock, int speed, int clock )
	{
	MCATT(sock) = ((pxa2xx_mcxx_setup(speed, clock)
	& MCXX_SETUP_MASK) << MCXX_SETUP_SHIFT)
	\| ((pxa2xx_mcxx_asst(speed, clock)
	& MCXX_ASST_MASK) << MCXX_ASST_SHIFT)
	\| ((pxa2xx_mcxx_hold(speed, clock)
	& MCXX_HOLD_MASK) << MCXX_HOLD_SHIFT);

	return 0;
	}

	static int pxa2xx_pcmcia_set_mcxx(struct soc_pcmcia_socket *skt, unsigned int clk)
	{
	struct soc_pcmcia_timing timing;
	int sock = skt->nr;

	soc_common_pcmcia_get_timing(skt, &timing);

	pxa2xx_pcmcia_set_mcmem(sock, timing.mem, clk);
	pxa2xx_pcmcia_set_mcatt(sock, timing.attr, clk);
	pxa2xx_pcmcia_set_mcio(sock, timing.io, clk);

	return 0;
	}

	static int pxa2xx_pcmcia_set_timing(struct soc_pcmcia_socket *skt)
	{
	unsigned int clk = get_memclk_frequency_10khz();
	return pxa2xx_pcmcia_set_mcxx(skt, clk);
	}

	#ifdef CONFIG_CPU_FREQ

	static int
	pxa2xx_pcmcia_frequency_change(struct soc_pcmcia_socket *skt,
	unsigned long val,
	struct cpufreq_freqs *freqs)
	{
	#warning "it's not clear if this is right since the core CPU (N) clock has no effect on the memory (L) clock"
	switch (val) {
	case CPUFREQ_PRECHANGE:
	if (freqs->new > freqs->old) {
	debug(skt, 2, "new frequency %u.%uMHz > %u.%uMHz, "
	"pre-updating\n",
	freqs->new / 1000, (freqs->new / 100) % 10,
	freqs->old / 1000, (freqs->old / 100) % 10);
	pxa2xx_pcmcia_set_mcxx(skt, freqs->new);
	}
	break;

	case CPUFREQ_POSTCHANGE:
	if (freqs->new < freqs->old) {
	debug(skt, 2, "new frequency %u.%uMHz < %u.%uMHz, "
	"post-updating\n",
	freqs->new / 1000, (freqs->new / 100) % 10,
	freqs->old / 1000, (freqs->old / 100) % 10);
	pxa2xx_pcmcia_set_mcxx(skt, freqs->new);
	}
	break;
	}
	return 0;
	}
	#endif

	int pxa2xx_drv_pcmcia_probe(struct device *dev)
	{
	int ret;
	struct pcmcia_low_level *ops;
	int first, nr;

	if (!dev \|\| !dev->platform_data)
	return -ENODEV;

	ops = (struct pcmcia_low_level *)dev->platform_data;
	first = ops->first;
	nr = ops->nr;

	/* Provide our PXA2xx specific timing routines. */
	ops->set_timing = pxa2xx_pcmcia_set_timing;
	#ifdef CONFIG_CPU_FREQ
	ops->frequency_change = pxa2xx_pcmcia_frequency_change;
	#endif

	ret = soc_common_drv_pcmcia_probe(dev, ops, first, nr);

	if (ret == 0) {
	/*
	* We have at least one socket, so set MECR:CIT
	* (Card Is There)
	*/
	MECR \|= MECR_CIT;

	/* Set MECR:NOS (Number Of Sockets) */
	if (nr > 1)
	MECR \|= MECR_NOS;
	else
	MECR &= ~MECR_NOS;
	}

	return ret;
	}
	EXPORT_SYMBOL(pxa2xx_drv_pcmcia_probe);

	static int pxa2xx_drv_pcmcia_suspend(struct device *dev, u32 state, u32 level)
	{
	int ret = 0;
	if (level == SUSPEND_SAVE_STATE)
	ret = pcmcia_socket_dev_suspend(dev, state);
	return ret;
	}

	static int pxa2xx_drv_pcmcia_resume(struct device *dev, u32 level)
	{
	int ret = 0;
	if (level == RESUME_RESTORE_STATE)
	{
	struct pcmcia_low_level *ops = dev->platform_data;
	int nr = ops ? ops->nr : 0;

	MECR = nr > 1 ? MECR_CIT \| MECR_NOS : (nr > 0 ? MECR_CIT : 0);
	ret = pcmcia_socket_dev_resume(dev);
	}
	return ret;
	}

	static struct device_driver pxa2xx_pcmcia_driver = {
	.probe = pxa2xx_drv_pcmcia_probe,
	.remove = soc_common_drv_pcmcia_remove,
	.suspend = pxa2xx_drv_pcmcia_suspend,
	.resume = pxa2xx_drv_pcmcia_resume,
	.name = "pxa2xx-pcmcia",
	.bus = &platform_bus_type,
	};

	static int __init pxa2xx_pcmcia_init(void)
	{
	return driver_register(&pxa2xx_pcmcia_driver);
	}

	static void __exit pxa2xx_pcmcia_exit(void)
	{
	driver_unregister(&pxa2xx_pcmcia_driver);
	}

	module_init(pxa2xx_pcmcia_init);
	module_exit(pxa2xx_pcmcia_exit);

	MODULE_AUTHOR("Stefan Eletzhofer <stefan.eletzhofer@inquant.de> and Ian Molton <spyro@f2s.com>");
	MODULE_DESCRIPTION("Linux PCMCIA Card Services: PXA2xx core socket driver");
	MODULE_LICENSE("GPL");