diff options
author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 22:20:36 (GMT) |
---|---|---|
committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 22:20:36 (GMT) |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/pcmcia/pxa2xx_base.c | |
download | linux-fsl-qoriq-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.xz |
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'drivers/pcmcia/pxa2xx_base.c')
-rw-r--r-- | drivers/pcmcia/pxa2xx_base.c | 254 |
1 files changed, 254 insertions, 0 deletions
diff --git a/drivers/pcmcia/pxa2xx_base.c b/drivers/pcmcia/pxa2xx_base.c new file mode 100644 index 0000000..a6936a7 --- /dev/null +++ b/drivers/pcmcia/pxa2xx_base.c @@ -0,0 +1,254 @@ +/*====================================================================== + + 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"); |