| // 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"); |