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linux/drivers/pcmcia/pxa2xx_base.c
Marek Vasut d344a21a9a [ARM] pxa: fix frequency scaling for pcmcia/pxa2xx_base 
The MCxx values must be based off memory clock, not CPU core clock.

This also fixes the bug where on some machines the LCD went crazy
while using PCMCIA.

Signed-off-by: Marek Vasut <marek.vasut@gmail.com>
Cc: Nicolas Pitre <nico@fluxnic.net>
Reviewed-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Eric Miao <eric.y.miao@gmail.com>
2010-07-13 16:09:06 +08:00

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/*======================================================================
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/slab.h>
#include <linux/init.h>
#include <linux/cpufreq.h>
#include <linux/ioport.h>
#include <linux/kernel.h>
#include <linux/spinlock.h>
#include <linux/platform_device.h>
#include <mach/hardware.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/system.h>
#include <mach/pxa2xx-regs.h>
#include <asm/mach-types.h>
#include <pcmcia/cs_types.h>
#include <pcmcia/ss.h>
#include <pcmcia/cistpl.h>
#include "soc_common.h"
#include "pxa2xx_base.h"
/*
* Personal Computer Memory Card International Association (PCMCIA) sockets
*/
#define PCMCIAPrtSp 0x04000000 /* PCMCIA Partition Space [byte] */
#define PCMCIASp (4*PCMCIAPrtSp) /* PCMCIA Space [byte] */
#define PCMCIAIOSp PCMCIAPrtSp /* PCMCIA I/O Space [byte] */
#define PCMCIAAttrSp PCMCIAPrtSp /* PCMCIA Attribute Space [byte] */
#define PCMCIAMemSp PCMCIAPrtSp /* PCMCIA Memory Space [byte] */
#define PCMCIA0Sp PCMCIASp /* PCMCIA 0 Space [byte] */
#define PCMCIA0IOSp PCMCIAIOSp /* PCMCIA 0 I/O Space [byte] */
#define PCMCIA0AttrSp PCMCIAAttrSp /* PCMCIA 0 Attribute Space [byte] */
#define PCMCIA0MemSp PCMCIAMemSp /* PCMCIA 0 Memory Space [byte] */
#define PCMCIA1Sp PCMCIASp /* PCMCIA 1 Space [byte] */
#define PCMCIA1IOSp PCMCIAIOSp /* PCMCIA 1 I/O Space [byte] */
#define PCMCIA1AttrSp PCMCIAAttrSp /* PCMCIA 1 Attribute Space [byte] */
#define PCMCIA1MemSp PCMCIAMemSp /* PCMCIA 1 Memory Space [byte] */
#define _PCMCIA(Nb) /* PCMCIA [0..1] */ \
(0x20000000 + (Nb) * PCMCIASp)
#define _PCMCIAIO(Nb) _PCMCIA(Nb) /* PCMCIA I/O [0..1] */
#define _PCMCIAAttr(Nb) /* PCMCIA Attribute [0..1] */ \
(_PCMCIA(Nb) + 2 * PCMCIAPrtSp)
#define _PCMCIAMem(Nb) /* PCMCIA Memory [0..1] */ \
(_PCMCIA(Nb) + 3 * PCMCIAPrtSp)
#define _PCMCIA0 _PCMCIA(0) /* PCMCIA 0 */
#define _PCMCIA0IO _PCMCIAIO(0) /* PCMCIA 0 I/O */
#define _PCMCIA0Attr _PCMCIAAttr(0) /* PCMCIA 0 Attribute */
#define _PCMCIA0Mem _PCMCIAMem(0) /* PCMCIA 0 Memory */
#define _PCMCIA1 _PCMCIA(1) /* PCMCIA 1 */
#define _PCMCIA1IO _PCMCIAIO(1) /* PCMCIA 1 I/O */
#define _PCMCIA1Attr _PCMCIAAttr(1) /* PCMCIA 1 Attribute */
#define _PCMCIA1Mem _PCMCIAMem(1) /* PCMCIA 1 Memory */
#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)
{
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_timing(skt);
}
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_timing(skt);
}
break;
}
return 0;
}
#endif
static void pxa2xx_configure_sockets(struct device *dev)
{
struct pcmcia_low_level *ops = dev->platform_data;
/*
* We have at least one socket, so set MECR:CIT
* (Card Is There)
*/
MECR |= MECR_CIT;
/* Set MECR:NOS (Number Of Sockets) */
if ((ops->first + ops->nr) > 1 ||
machine_is_viper() || machine_is_arcom_zeus())
MECR |= MECR_NOS;
else
MECR &= ~MECR_NOS;
}
static const char *skt_names[] = {
"PCMCIA socket 0",
"PCMCIA socket 1",
};
#define SKT_DEV_INFO_SIZE(n) \
(sizeof(struct skt_dev_info) + (n)*sizeof(struct soc_pcmcia_socket))
int pxa2xx_drv_pcmcia_add_one(struct soc_pcmcia_socket *skt)
{
skt->res_skt.start = _PCMCIA(skt->nr);
skt->res_skt.end = _PCMCIA(skt->nr) + PCMCIASp - 1;
skt->res_skt.name = skt_names[skt->nr];
skt->res_skt.flags = IORESOURCE_MEM;
skt->res_io.start = _PCMCIAIO(skt->nr);
skt->res_io.end = _PCMCIAIO(skt->nr) + PCMCIAIOSp - 1;
skt->res_io.name = "io";
skt->res_io.flags = IORESOURCE_MEM | IORESOURCE_BUSY;
skt->res_mem.start = _PCMCIAMem(skt->nr);
skt->res_mem.end = _PCMCIAMem(skt->nr) + PCMCIAMemSp - 1;
skt->res_mem.name = "memory";
skt->res_mem.flags = IORESOURCE_MEM;
skt->res_attr.start = _PCMCIAAttr(skt->nr);
skt->res_attr.end = _PCMCIAAttr(skt->nr) + PCMCIAAttrSp - 1;
skt->res_attr.name = "attribute";
skt->res_attr.flags = IORESOURCE_MEM;
return soc_pcmcia_add_one(skt);
}
EXPORT_SYMBOL(pxa2xx_drv_pcmcia_add_one);
void pxa2xx_drv_pcmcia_ops(struct pcmcia_low_level *ops)
{
/* 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
}
EXPORT_SYMBOL(pxa2xx_drv_pcmcia_ops);
static int pxa2xx_drv_pcmcia_probe(struct platform_device *dev)
{
int i, ret = 0;
struct pcmcia_low_level *ops;
struct skt_dev_info *sinfo;
struct soc_pcmcia_socket *skt;
ops = (struct pcmcia_low_level *)dev->dev.platform_data;
if (!ops)
return -ENODEV;
pxa2xx_drv_pcmcia_ops(ops);
sinfo = kzalloc(SKT_DEV_INFO_SIZE(ops->nr), GFP_KERNEL);
if (!sinfo)
return -ENOMEM;
sinfo->nskt = ops->nr;
/* Initialize processor specific parameters */
for (i = 0; i < ops->nr; i++) {
skt = &sinfo->skt[i];
skt->nr = ops->first + i;
skt->ops = ops;
skt->socket.owner = ops->owner;
skt->socket.dev.parent = &dev->dev;
skt->socket.pci_irq = NO_IRQ;
ret = pxa2xx_drv_pcmcia_add_one(skt);
if (ret)
break;
}
if (ret) {
while (--i >= 0)
soc_pcmcia_remove_one(&sinfo->skt[i]);
kfree(sinfo);
} else {
pxa2xx_configure_sockets(&dev->dev);
dev_set_drvdata(&dev->dev, sinfo);
}
return ret;
}
static int pxa2xx_drv_pcmcia_remove(struct platform_device *dev)
{
struct skt_dev_info *sinfo = platform_get_drvdata(dev);
int i;
platform_set_drvdata(dev, NULL);
for (i = 0; i < sinfo->nskt; i++)
soc_pcmcia_remove_one(&sinfo->skt[i]);
kfree(sinfo);
return 0;
}
static int pxa2xx_drv_pcmcia_resume(struct device *dev)
{
pxa2xx_configure_sockets(dev);
return 0;
}
static const struct dev_pm_ops pxa2xx_drv_pcmcia_pm_ops = {
.resume = pxa2xx_drv_pcmcia_resume,
};
static struct platform_driver pxa2xx_pcmcia_driver = {
.probe = pxa2xx_drv_pcmcia_probe,
.remove = pxa2xx_drv_pcmcia_remove,
.driver = {
.name = "pxa2xx-pcmcia",
.owner = THIS_MODULE,
.pm = &pxa2xx_drv_pcmcia_pm_ops,
},
};
static int __init pxa2xx_pcmcia_init(void)
{
return platform_driver_register(&pxa2xx_pcmcia_driver);
}
static void __exit pxa2xx_pcmcia_exit(void)
{
platform_driver_unregister(&pxa2xx_pcmcia_driver);
}
fs_initcall(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");
MODULE_ALIAS("platform:pxa2xx-pcmcia");
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