243 lines
6.2 KiB
C
243 lines
6.2 KiB
C
/*======================================================================
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Device driver for the PCMCIA control functionality of PXA2xx
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microprocessors.
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The contents of this file may be used under the
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terms of the GNU Public License version 2 (the "GPL")
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(c) Ian Molton (spyro@f2s.com) 2003
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(c) Stefan Eletzhofer (stefan.eletzhofer@inquant.de) 2003,4
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derived from sa11xx_base.c
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Portions created by John G. Dorsey are
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Copyright (C) 1999 John G. Dorsey.
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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/cpufreq.h>
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#include <linux/ioport.h>
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#include <linux/kernel.h>
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#include <linux/spinlock.h>
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#include <linux/platform_device.h>
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#include <asm/hardware.h>
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#include <asm/io.h>
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#include <asm/irq.h>
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#include <asm/system.h>
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#include <asm/arch/pxa-regs.h>
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#include <pcmcia/cs_types.h>
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#include <pcmcia/ss.h>
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#include <pcmcia/bulkmem.h>
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#include <pcmcia/cistpl.h>
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#include "cs_internal.h"
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#include "soc_common.h"
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#include "pxa2xx_base.h"
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#define MCXX_SETUP_MASK (0x7f)
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#define MCXX_ASST_MASK (0x1f)
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#define MCXX_HOLD_MASK (0x3f)
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#define MCXX_SETUP_SHIFT (0)
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#define MCXX_ASST_SHIFT (7)
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#define MCXX_HOLD_SHIFT (14)
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static inline u_int pxa2xx_mcxx_hold(u_int pcmcia_cycle_ns,
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u_int mem_clk_10khz)
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{
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u_int code = pcmcia_cycle_ns * mem_clk_10khz;
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return (code / 300000) + ((code % 300000) ? 1 : 0) - 1;
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}
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static inline u_int pxa2xx_mcxx_asst(u_int pcmcia_cycle_ns,
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u_int mem_clk_10khz)
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{
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u_int code = pcmcia_cycle_ns * mem_clk_10khz;
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return (code / 300000) + ((code % 300000) ? 1 : 0) - 1;
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}
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static inline u_int pxa2xx_mcxx_setup(u_int pcmcia_cycle_ns,
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u_int mem_clk_10khz)
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{
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u_int code = pcmcia_cycle_ns * mem_clk_10khz;
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return (code / 100000) + ((code % 100000) ? 1 : 0) - 1;
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}
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/* This function returns the (approximate) command assertion period, in
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* nanoseconds, for a given CPU clock frequency and MCXX_ASST value:
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*/
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static inline u_int pxa2xx_pcmcia_cmd_time(u_int mem_clk_10khz,
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u_int pcmcia_mcxx_asst)
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{
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return (300000 * (pcmcia_mcxx_asst + 1) / mem_clk_10khz);
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}
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static int pxa2xx_pcmcia_set_mcmem( int sock, int speed, int clock )
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{
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MCMEM(sock) = ((pxa2xx_mcxx_setup(speed, clock)
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& MCXX_SETUP_MASK) << MCXX_SETUP_SHIFT)
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| ((pxa2xx_mcxx_asst(speed, clock)
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& MCXX_ASST_MASK) << MCXX_ASST_SHIFT)
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| ((pxa2xx_mcxx_hold(speed, clock)
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& MCXX_HOLD_MASK) << MCXX_HOLD_SHIFT);
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return 0;
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}
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static int pxa2xx_pcmcia_set_mcio( int sock, int speed, int clock )
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{
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MCIO(sock) = ((pxa2xx_mcxx_setup(speed, clock)
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& MCXX_SETUP_MASK) << MCXX_SETUP_SHIFT)
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| ((pxa2xx_mcxx_asst(speed, clock)
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& MCXX_ASST_MASK) << MCXX_ASST_SHIFT)
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| ((pxa2xx_mcxx_hold(speed, clock)
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& MCXX_HOLD_MASK) << MCXX_HOLD_SHIFT);
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return 0;
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}
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static int pxa2xx_pcmcia_set_mcatt( int sock, int speed, int clock )
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{
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MCATT(sock) = ((pxa2xx_mcxx_setup(speed, clock)
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& MCXX_SETUP_MASK) << MCXX_SETUP_SHIFT)
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| ((pxa2xx_mcxx_asst(speed, clock)
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& MCXX_ASST_MASK) << MCXX_ASST_SHIFT)
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| ((pxa2xx_mcxx_hold(speed, clock)
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& MCXX_HOLD_MASK) << MCXX_HOLD_SHIFT);
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return 0;
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}
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static int pxa2xx_pcmcia_set_mcxx(struct soc_pcmcia_socket *skt, unsigned int clk)
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{
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struct soc_pcmcia_timing timing;
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int sock = skt->nr;
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soc_common_pcmcia_get_timing(skt, &timing);
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pxa2xx_pcmcia_set_mcmem(sock, timing.mem, clk);
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pxa2xx_pcmcia_set_mcatt(sock, timing.attr, clk);
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pxa2xx_pcmcia_set_mcio(sock, timing.io, clk);
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return 0;
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}
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static int pxa2xx_pcmcia_set_timing(struct soc_pcmcia_socket *skt)
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{
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unsigned int clk = get_memclk_frequency_10khz();
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return pxa2xx_pcmcia_set_mcxx(skt, clk);
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}
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#ifdef CONFIG_CPU_FREQ
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static int
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pxa2xx_pcmcia_frequency_change(struct soc_pcmcia_socket *skt,
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unsigned long val,
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struct cpufreq_freqs *freqs)
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{
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#warning "it's not clear if this is right since the core CPU (N) clock has no effect on the memory (L) clock"
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switch (val) {
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case CPUFREQ_PRECHANGE:
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if (freqs->new > freqs->old) {
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debug(skt, 2, "new frequency %u.%uMHz > %u.%uMHz, "
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"pre-updating\n",
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freqs->new / 1000, (freqs->new / 100) % 10,
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freqs->old / 1000, (freqs->old / 100) % 10);
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pxa2xx_pcmcia_set_mcxx(skt, freqs->new);
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}
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break;
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case CPUFREQ_POSTCHANGE:
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if (freqs->new < freqs->old) {
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debug(skt, 2, "new frequency %u.%uMHz < %u.%uMHz, "
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"post-updating\n",
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freqs->new / 1000, (freqs->new / 100) % 10,
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freqs->old / 1000, (freqs->old / 100) % 10);
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pxa2xx_pcmcia_set_mcxx(skt, freqs->new);
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}
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break;
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}
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return 0;
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}
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#endif
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int pxa2xx_drv_pcmcia_probe(struct device *dev)
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{
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int ret;
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struct pcmcia_low_level *ops;
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int first, nr;
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if (!dev || !dev->platform_data)
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return -ENODEV;
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ops = (struct pcmcia_low_level *)dev->platform_data;
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first = ops->first;
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nr = ops->nr;
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/* Provide our PXA2xx specific timing routines. */
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ops->set_timing = pxa2xx_pcmcia_set_timing;
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#ifdef CONFIG_CPU_FREQ
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ops->frequency_change = pxa2xx_pcmcia_frequency_change;
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#endif
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ret = soc_common_drv_pcmcia_probe(dev, ops, first, nr);
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if (ret == 0) {
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/*
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* We have at least one socket, so set MECR:CIT
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* (Card Is There)
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*/
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MECR |= MECR_CIT;
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/* Set MECR:NOS (Number Of Sockets) */
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if (nr > 1)
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MECR |= MECR_NOS;
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else
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MECR &= ~MECR_NOS;
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}
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return ret;
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}
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EXPORT_SYMBOL(pxa2xx_drv_pcmcia_probe);
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static int pxa2xx_drv_pcmcia_resume(struct device *dev)
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{
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struct pcmcia_low_level *ops = dev->platform_data;
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int nr = ops ? ops->nr : 0;
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MECR = nr > 1 ? MECR_CIT | MECR_NOS : (nr > 0 ? MECR_CIT : 0);
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return pcmcia_socket_dev_resume(dev);
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}
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static struct device_driver pxa2xx_pcmcia_driver = {
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.probe = pxa2xx_drv_pcmcia_probe,
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.remove = soc_common_drv_pcmcia_remove,
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.suspend = pcmcia_socket_dev_suspend,
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.resume = pxa2xx_drv_pcmcia_resume,
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.name = "pxa2xx-pcmcia",
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.bus = &platform_bus_type,
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};
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static int __init pxa2xx_pcmcia_init(void)
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{
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return driver_register(&pxa2xx_pcmcia_driver);
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}
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static void __exit pxa2xx_pcmcia_exit(void)
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{
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driver_unregister(&pxa2xx_pcmcia_driver);
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}
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fs_initcall(pxa2xx_pcmcia_init);
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module_exit(pxa2xx_pcmcia_exit);
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MODULE_AUTHOR("Stefan Eletzhofer <stefan.eletzhofer@inquant.de> and Ian Molton <spyro@f2s.com>");
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MODULE_DESCRIPTION("Linux PCMCIA Card Services: PXA2xx core socket driver");
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MODULE_LICENSE("GPL");
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