diff options
Diffstat (limited to '')
-rw-r--r-- | drivers/pcmcia/omap_cf.c | 331 |
1 files changed, 331 insertions, 0 deletions
diff --git a/drivers/pcmcia/omap_cf.c b/drivers/pcmcia/omap_cf.c new file mode 100644 index 000000000..d3f827d42 --- /dev/null +++ b/drivers/pcmcia/omap_cf.c @@ -0,0 +1,331 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * omap_cf.c -- OMAP 16xx CompactFlash controller driver + * + * Copyright (c) 2005 David Brownell + */ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/platform_device.h> +#include <linux/errno.h> +#include <linux/init.h> +#include <linux/delay.h> +#include <linux/interrupt.h> +#include <linux/slab.h> + +#include <pcmcia/ss.h> + +#include <asm/io.h> +#include <linux/sizes.h> + +#include <linux/soc/ti/omap1-io.h> +#include <linux/soc/ti/omap1-soc.h> +#include <linux/soc/ti/omap1-mux.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 (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 (CF_BASE + 0x02) + +/* card reset */ +#define CF_CONTROL (CF_BASE + 0x04) +# define CF_CONTROL_RESET (1 << 0) + +#define omap_cf_present() (!(omap_readw(CF_STATUS) & 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; + struct resource iomem; +}; + +#define POLL_INTERVAL (2 * HZ) + +/*--------------------------------------------------------------------------*/ + +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(struct timer_list *t) +{ + struct omap_cf_socket *cf = from_timer(cf, t, timer); + 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 omap_cf_socket *cf = (struct omap_cf_socket *)_cf; + + omap_cf_timer(&cf->timer); + return IRQ_HANDLED; +} + +static int omap_cf_get_status(struct pcmcia_socket *s, u_int *sp) +{ + if (!sp) + return -EINVAL; + + /* NOTE CF is always 3VCARD */ + 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->pcmcia_irq = 0; + s->pci_irq = cf->irq; + } else + *sp = 0; + return 0; +} + +static int +omap_cf_set_socket(struct pcmcia_socket *sock, struct socket_state_t *s) +{ + /* REVISIT some non-OSK boards may support power switching */ + switch (s->Vcc) { + case 0: + case 33: + break; + default: + return -EINVAL; + } + + omap_readw(CF_CONTROL); + if (s->flags & SS_RESET) + omap_writew(CF_CONTROL_RESET, CF_CONTROL); + else + omap_writew(0, CF_CONTROL); + + 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, __func__); + 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 platform_device *pdev) +{ + unsigned seg; + struct omap_cf_socket *cf; + int irq; + int status; + struct resource *res; + struct resource iospace = DEFINE_RES_IO(SZ_64, SZ_4K); + + seg = (int) pdev->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 < 0) + return -EINVAL; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + + cf = kzalloc(sizeof *cf, GFP_KERNEL); + if (!cf) + return -ENOMEM; + timer_setup(&cf->timer, omap_cf_timer, 0); + + cf->pdev = pdev; + platform_set_drvdata(pdev, cf); + + /* this primarily just shuts up irq handling noise */ + status = request_irq(irq, omap_cf_irq, IRQF_SHARED, + driver_name, cf); + if (status < 0) + goto fail0; + cf->irq = irq; + cf->socket.pci_irq = irq; + cf->phys_cf = res->start; + + /* pcmcia layer only remaps "real" memory */ + cf->socket.io_offset = iospace.start; + status = pci_remap_iospace(&iospace, cf->phys_cf + SZ_4K); + if (status) { + status = -ENOMEM; + goto fail1; + } + + if (!request_mem_region(cf->phys_cf, SZ_8K, driver_name)) { + status = -ENXIO; + 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); + + omap_writew(~(1 << seg), CF_CFG); + + pr_info("%s: cs%d on irq %d\n", driver_name, seg, irq); + + /* CF uses armxor_ck, which is "always" available */ + + pr_debug("%s: sts %04x cfg %04x control %04x %s\n", driver_name, + omap_readw(CF_STATUS), omap_readw(CF_CFG), + omap_readw(CF_CONTROL), + omap_cf_present() ? "present" : "(not present)"); + + cf->socket.owner = THIS_MODULE; + cf->socket.dev.parent = &pdev->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; + cf->socket.io[0].res = &cf->iomem; + + status = pcmcia_register_socket(&cf->socket); + if (status < 0) + goto fail2; + + cf->active = 1; + mod_timer(&cf->timer, jiffies + POLL_INTERVAL); + return 0; + +fail2: + release_mem_region(cf->phys_cf, SZ_8K); +fail1: + free_irq(irq, cf); +fail0: + kfree(cf); + return status; +} + +static int __exit omap_cf_remove(struct platform_device *pdev) +{ + struct omap_cf_socket *cf = platform_get_drvdata(pdev); + + cf->active = 0; + pcmcia_unregister_socket(&cf->socket); + del_timer_sync(&cf->timer); + release_mem_region(cf->phys_cf, SZ_8K); + free_irq(cf->irq, cf); + kfree(cf); + return 0; +} + +static struct platform_driver omap_cf_driver = { + .driver = { + .name = driver_name, + }, + .remove = __exit_p(omap_cf_remove), +}; + +static int __init omap_cf_init(void) +{ + if (cpu_is_omap16xx()) + return platform_driver_probe(&omap_cf_driver, omap_cf_probe); + return -ENODEV; +} + +static void __exit omap_cf_exit(void) +{ + if (cpu_is_omap16xx()) + platform_driver_unregister(&omap_cf_driver); +} + +module_init(omap_cf_init); +module_exit(omap_cf_exit); + +MODULE_DESCRIPTION("OMAP CF Driver"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:omap_cf"); |