diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/pcmcia/Kconfig | 7 | ||||
| -rw-r--r-- | drivers/pcmcia/Makefile | 1 | ||||
| -rw-r--r-- | drivers/pcmcia/omap_cf.c | 373 |
3 files changed, 381 insertions, 0 deletions
diff --git a/drivers/pcmcia/Kconfig b/drivers/pcmcia/Kconfig index 6485f75..ddc741e 100644 --- a/drivers/pcmcia/Kconfig +++ b/drivers/pcmcia/Kconfig @@ -221,6 +221,13 @@ config PCMCIA_VRC4173 tristate "NEC VRC4173 CARDU support" depends on CPU_VR41XX && PCI && PCMCIA +config OMAP_CF + tristate "OMAP CompactFlash Controller" + depends on PCMCIA && ARCH_OMAP16XX + help + Say Y here to support the CompactFlash controller on OMAP. + Note that this doesn't support "True IDE" mode. + config PCCARD_NONSTATIC tristate diff --git a/drivers/pcmcia/Makefile b/drivers/pcmcia/Makefile index ef694c7..a41fbb3 100644 --- a/drivers/pcmcia/Makefile +++ b/drivers/pcmcia/Makefile @@ -34,6 +34,7 @@ obj-$(CONFIG_M32R_CFC) += m32r_cfc.o obj-$(CONFIG_PCMCIA_AU1X00) += au1x00_ss.o obj-$(CONFIG_PCMCIA_VRC4171) += vrc4171_card.o obj-$(CONFIG_PCMCIA_VRC4173) += vrc4173_cardu.o +obj-$(CONFIG_OMAP_CF) += omap_cf.o sa11xx_core-y += soc_common.o sa11xx_base.o pxa2xx_core-y += soc_common.o pxa2xx_base.o diff --git a/drivers/pcmcia/omap_cf.c b/drivers/pcmcia/omap_cf.c new file mode 100644 index 0000000..08d1c92 --- /dev/null +++ b/drivers/pcmcia/omap_cf.c @@ -0,0 +1,373 @@ +/* + * omap_cf.c -- OMAP 16xx CompactFlash controller driver + * + * Copyright (c) 2005 David Brownell + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + */ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/sched.h> +#include <linux/device.h> +#include <linux/errno.h> +#include <linux/init.h> +#include <linux/delay.h> +#include <linux/interrupt.h> + +#include <pcmcia/ss.h> + +#include <asm/hardware.h> +#include <asm/io.h> +#include <asm/mach-types.h> +#include <asm/sizes.h> + +#include <asm/arch/mux.h> +#include <asm/arch/tc.h> + + +/* NOTE: don't expect this to support many I/O cards. The 16xx chips have + * hard-wired timings to support Compact Flash memory cards; they won't work + * with various other devices (like WLAN adapters) without some external + * logic to help out. + * + * NOTE: CF controller docs disagree with address space docs as to where + * CF_BASE really lives; this is a doc erratum. + */ +#define CF_BASE 0xfffe2800 + +/* status; read after IRQ */ +#define CF_STATUS_REG __REG16(CF_BASE + 0x00) +# define CF_STATUS_BAD_READ (1 << 2) +# define CF_STATUS_BAD_WRITE (1 << 1) +# define CF_STATUS_CARD_DETECT (1 << 0) + +/* which chipselect (CS0..CS3) is used for CF (active low) */ +#define CF_CFG_REG __REG16(CF_BASE + 0x02) + +/* card reset */ +#define CF_CONTROL_REG __REG16(CF_BASE + 0x04) +# define CF_CONTROL_RESET (1 << 0) + +#define omap_cf_present() (!(CF_STATUS_REG & CF_STATUS_CARD_DETECT)) + +/*--------------------------------------------------------------------------*/ + +static const char driver_name[] = "omap_cf"; + +struct omap_cf_socket { + struct pcmcia_socket socket; + + struct timer_list timer; + unsigned present:1; + unsigned active:1; + + struct platform_device *pdev; + unsigned long phys_cf; + u_int irq; +}; + +#define POLL_INTERVAL (2 * HZ) + +#define SZ_2K (2 * SZ_1K) + +/*--------------------------------------------------------------------------*/ + +static int omap_cf_ss_init(struct pcmcia_socket *s) +{ + return 0; +} + +/* the timer is primarily to kick this socket's pccardd */ +static void omap_cf_timer(unsigned long _cf) +{ + struct omap_cf_socket *cf = (void *) _cf; + unsigned present = omap_cf_present(); + + if (present != cf->present) { + cf->present = present; + pr_debug("%s: card %s\n", driver_name, + present ? "present" : "gone"); + pcmcia_parse_events(&cf->socket, SS_DETECT); + } + + if (cf->active) + mod_timer(&cf->timer, jiffies + POLL_INTERVAL); +} + +/* This irq handler prevents "irqNNN: nobody cared" messages as drivers + * claim the card's IRQ. It may also detect some card insertions, but + * not removals; it can't always eliminate timer irqs. + */ +static irqreturn_t omap_cf_irq(int irq, void *_cf, struct pt_regs *r) +{ + omap_cf_timer((unsigned long)_cf); + return IRQ_HANDLED; +} + +static int omap_cf_get_status(struct pcmcia_socket *s, u_int *sp) +{ + if (!sp) + return -EINVAL; + + /* FIXME power management should probably be board-specific: + * - 3VCARD vs XVCARD (OSK only handles 3VCARD) + * - POWERON (switched on/off by set_socket) + */ + if (omap_cf_present()) { + struct omap_cf_socket *cf; + + *sp = SS_READY | SS_DETECT | SS_POWERON | SS_3VCARD; + cf = container_of(s, struct omap_cf_socket, socket); + s->irq.AssignedIRQ = cf->irq; + } else + *sp = 0; + return 0; +} + +static int +omap_cf_set_socket(struct pcmcia_socket *sock, struct socket_state_t *s) +{ + u16 control; + + /* FIXME some non-OSK boards will support power switching */ + switch (s->Vcc) { + case 0: + case 33: + break; + default: + return -EINVAL; + } + + control = CF_CONTROL_REG; + if (s->flags & SS_RESET) + CF_CONTROL_REG = CF_CONTROL_RESET; + else + CF_CONTROL_REG = 0; + + pr_debug("%s: Vcc %d, io_irq %d, flags %04x csc %04x\n", + driver_name, s->Vcc, s->io_irq, s->flags, s->csc_mask); + + return 0; +} + +static int omap_cf_ss_suspend(struct pcmcia_socket *s) +{ + pr_debug("%s: %s\n", driver_name, __FUNCTION__); + return omap_cf_set_socket(s, &dead_socket); +} + +/* regions are 2K each: mem, attrib, io (and reserved-for-ide) */ + +static int +omap_cf_set_io_map(struct pcmcia_socket *s, struct pccard_io_map *io) +{ + struct omap_cf_socket *cf; + + cf = container_of(s, struct omap_cf_socket, socket); + io->flags &= MAP_ACTIVE|MAP_ATTRIB|MAP_16BIT; + io->start = cf->phys_cf + SZ_4K; + io->stop = io->start + SZ_2K - 1; + return 0; +} + +static int +omap_cf_set_mem_map(struct pcmcia_socket *s, struct pccard_mem_map *map) +{ + struct omap_cf_socket *cf; + + if (map->card_start) + return -EINVAL; + cf = container_of(s, struct omap_cf_socket, socket); + map->static_start = cf->phys_cf; + map->flags &= MAP_ACTIVE|MAP_ATTRIB|MAP_16BIT; + if (map->flags & MAP_ATTRIB) + map->static_start += SZ_2K; + return 0; +} + +static struct pccard_operations omap_cf_ops = { + .init = omap_cf_ss_init, + .suspend = omap_cf_ss_suspend, + .get_status = omap_cf_get_status, + .set_socket = omap_cf_set_socket, + .set_io_map = omap_cf_set_io_map, + .set_mem_map = omap_cf_set_mem_map, +}; + +/*--------------------------------------------------------------------------*/ + +/* + * NOTE: right now the only board-specific platform_data is + * "what chipselect is used". Boards could want more. + */ + +static int __init omap_cf_probe(struct device *dev) +{ + unsigned seg; + struct omap_cf_socket *cf; + struct platform_device *pdev = to_platform_device(dev); + int irq; + int status; + + seg = (int) dev->platform_data; + if (seg == 0 || seg > 3) + return -ENODEV; + + /* either CFLASH.IREQ (INT_1610_CF) or some GPIO */ + irq = platform_get_irq(pdev, 0); + if (!irq) + return -EINVAL; + + cf = kcalloc(1, sizeof *cf, GFP_KERNEL); + if (!cf) + return -ENOMEM; + init_timer(&cf->timer); + cf->timer.function = omap_cf_timer; + cf->timer.data = (unsigned long) cf; + + cf->pdev = pdev; + dev_set_drvdata(dev, cf); + + /* this primarily just shuts up irq handling noise */ + status = request_irq(irq, omap_cf_irq, SA_SHIRQ, + driver_name, cf); + if (status < 0) + goto fail0; + cf->irq = irq; + cf->socket.pci_irq = irq; + + switch (seg) { + /* NOTE: CS0 could be configured too ... */ + case 1: + cf->phys_cf = OMAP_CS1_PHYS; + break; + case 2: + cf->phys_cf = OMAP_CS2_PHYS; + break; + case 3: + cf->phys_cf = omap_cs3_phys(); + break; + default: + goto fail1; + } + + /* pcmcia layer only remaps "real" memory */ + cf->socket.io_offset = (unsigned long) + ioremap(cf->phys_cf + SZ_4K, SZ_2K); + if (!cf->socket.io_offset) + goto fail1; + + if (!request_mem_region(cf->phys_cf, SZ_8K, driver_name)) + goto fail1; + + /* NOTE: CF conflicts with MMC1 */ + omap_cfg_reg(W11_1610_CF_CD1); + omap_cfg_reg(P11_1610_CF_CD2); + omap_cfg_reg(R11_1610_CF_IOIS16); + omap_cfg_reg(V10_1610_CF_IREQ); + omap_cfg_reg(W10_1610_CF_RESET); + + CF_CFG_REG = ~(1 << seg); + + pr_info("%s: cs%d on irq %d\n", driver_name, seg, irq); + + /* NOTE: better EMIFS setup might support more cards; but the + * TRM only shows how to affect regular flash signals, not their + * CF/PCMCIA variants... + */ + pr_debug("%s: cs%d, previous ccs %08x acs %08x\n", driver_name, + seg, EMIFS_CCS(seg), EMIFS_ACS(seg)); + EMIFS_CCS(seg) = 0x0004a1b3; /* synch mode 4 etc */ + EMIFS_ACS(seg) = 0x00000000; /* OE hold/setup */ + + /* CF uses armxor_ck, which is "always" available */ + + pr_debug("%s: sts %04x cfg %04x control %04x %s\n", driver_name, + CF_STATUS_REG, CF_CFG_REG, CF_CONTROL_REG, + omap_cf_present() ? "present" : "(not present)"); + + cf->socket.owner = THIS_MODULE; + cf->socket.dev.dev = dev; + cf->socket.ops = &omap_cf_ops; + cf->socket.resource_ops = &pccard_static_ops; + cf->socket.features = SS_CAP_PCCARD | SS_CAP_STATIC_MAP + | SS_CAP_MEM_ALIGN; + cf->socket.map_size = SZ_2K; + + status = pcmcia_register_socket(&cf->socket); + if (status < 0) + goto fail2; + + cf->active = 1; + mod_timer(&cf->timer, jiffies + POLL_INTERVAL); + return 0; + +fail2: + iounmap((void __iomem *) cf->socket.io_offset); + release_mem_region(cf->phys_cf, SZ_8K); +fail1: + free_irq(irq, cf); +fail0: + kfree(cf); + return status; +} + +static int __devexit omap_cf_remove(struct device *dev) +{ + struct omap_cf_socket *cf = dev_get_drvdata(dev); + + cf->active = 0; + pcmcia_unregister_socket(&cf->socket); + del_timer_sync(&cf->timer); + iounmap((void __iomem *) cf->socket.io_offset); + release_mem_region(cf->phys_cf, SZ_8K); + free_irq(cf->irq, cf); + kfree(cf); + return 0; +} + +static int omap_cf_suspend(struct device *dev, pm_message_t mesg, u32 level) +{ + if (level != SUSPEND_SAVE_STATE) + return 0; + return pcmcia_socket_dev_suspend(dev, mesg); +} + +static int omap_cf_resume(struct device *dev, u32 level) +{ + if (level != RESUME_RESTORE_STATE) + return 0; + return pcmcia_socket_dev_resume(dev); +} + +static struct device_driver omap_cf_driver = { + .name = (char *) driver_name, + .bus = &platform_bus_type, + .probe = omap_cf_probe, + .remove = __devexit_p(omap_cf_remove), + .suspend = omap_cf_suspend, + .resume = omap_cf_resume, +}; + +static int __init omap_cf_init(void) +{ + if (cpu_is_omap16xx()) + driver_register(&omap_cf_driver); + return 0; +} + +static void __exit omap_cf_exit(void) +{ + if (cpu_is_omap16xx()) + driver_unregister(&omap_cf_driver); +} + +module_init(omap_cf_init); +module_exit(omap_cf_exit); + +MODULE_DESCRIPTION("OMAP CF Driver"); +MODULE_LICENSE("GPL"); |