/*====================================================================== 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/cpufreq.h> #include <linux/ioport.h> #include <linux/kernel.h> #include <linux/spinlock.h> #include <linux/platform_device.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_resume(struct device *dev) { 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); return pcmcia_socket_dev_resume(dev); } static struct device_driver pxa2xx_pcmcia_driver = { .probe = pxa2xx_drv_pcmcia_probe, .remove = soc_common_drv_pcmcia_remove, .suspend = pcmcia_socket_dev_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); } 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");