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drivers/pcmcia/omap_cf.c
8.55 KB
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// SPDX-License-Identifier: GPL-2.0-or-later |
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/* * omap_cf.c -- OMAP 16xx CompactFlash controller driver * * Copyright (c) 2005 David Brownell |
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*/ #include <linux/module.h> #include <linux/kernel.h> |
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#include <linux/platform_device.h> |
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#include <linux/errno.h> #include <linux/init.h> #include <linux/delay.h> #include <linux/interrupt.h> |
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#include <linux/slab.h> |
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#include <pcmcia/ss.h> |
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#include <mach/hardware.h> |
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#include <asm/io.h> |
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#include <linux/sizes.h> |
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|
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#include <mach/mux.h> |
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#include <mach/tc.h> |
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/* 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 */ |
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#define CF_STATUS (CF_BASE + 0x00) |
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# 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) */ |
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#define CF_CFG (CF_BASE + 0x02) |
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/* card reset */ |
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#define CF_CONTROL (CF_BASE + 0x04) |
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# define CF_CONTROL_RESET (1 << 0) |
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#define omap_cf_present() (!(omap_readw(CF_STATUS) & CF_STATUS_CARD_DETECT)) |
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/*--------------------------------------------------------------------------*/ 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; |
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struct resource iomem; |
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}; #define POLL_INTERVAL (2 * HZ) |
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/*--------------------------------------------------------------------------*/ static int omap_cf_ss_init(struct pcmcia_socket *s) { return 0; } /* the timer is primarily to kick this socket's pccardd */ |
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static void omap_cf_timer(struct timer_list *t) |
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{ |
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struct omap_cf_socket *cf = from_timer(cf, t, timer); |
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unsigned present = omap_cf_present(); if (present != cf->present) { cf->present = present; pr_debug("%s: card %s ", 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. */ |
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static irqreturn_t omap_cf_irq(int irq, void *_cf) |
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{ |
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struct omap_cf_socket *cf = (struct omap_cf_socket *)_cf; omap_cf_timer(&cf->timer); |
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return IRQ_HANDLED; } static int omap_cf_get_status(struct pcmcia_socket *s, u_int *sp) { if (!sp) return -EINVAL; |
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/* NOTE CF is always 3VCARD */ |
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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); |
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s->pcmcia_irq = 0; |
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s->pci_irq = cf->irq; |
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} else *sp = 0; return 0; } static int omap_cf_set_socket(struct pcmcia_socket *sock, struct socket_state_t *s) { u16 control; |
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/* REVISIT some non-OSK boards may support power switching */ |
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switch (s->Vcc) { case 0: case 33: break; default: return -EINVAL; } |
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control = omap_readw(CF_CONTROL); |
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if (s->flags & SS_RESET) |
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omap_writew(CF_CONTROL_RESET, CF_CONTROL); |
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else |
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omap_writew(0, CF_CONTROL); |
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pr_debug("%s: Vcc %d, io_irq %d, flags %04x csc %04x ", driver_name, s->Vcc, s->io_irq, s->flags, s->csc_mask); return 0; } static int omap_cf_ss_suspend(struct pcmcia_socket *s) { |
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pr_debug("%s: %s ", driver_name, __func__); |
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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. */ |
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static int __init omap_cf_probe(struct platform_device *pdev) |
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{ unsigned seg; struct omap_cf_socket *cf; |
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int irq; int status; |
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seg = (int) pdev->dev.platform_data; |
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if (seg == 0 || seg > 3) return -ENODEV; /* either CFLASH.IREQ (INT_1610_CF) or some GPIO */ irq = platform_get_irq(pdev, 0); |
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if (irq < 0) |
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return -EINVAL; |
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cf = kzalloc(sizeof *cf, GFP_KERNEL); |
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if (!cf) return -ENOMEM; |
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timer_setup(&cf->timer, omap_cf_timer, 0); |
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cf->pdev = pdev; |
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platform_set_drvdata(pdev, cf); |
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/* this primarily just shuts up irq handling noise */ |
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status = request_irq(irq, omap_cf_irq, IRQF_SHARED, |
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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; } |
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cf->iomem.start = cf->phys_cf; cf->iomem.end = cf->iomem.end + SZ_8K - 1; cf->iomem.flags = IORESOURCE_MEM; |
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/* 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); |
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omap_writew(~(1 << seg), CF_CFG); |
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pr_info("%s: cs%d on irq %d ", 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 ", driver_name, |
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seg, omap_readl(EMIFS_CCS(seg)), omap_readl(EMIFS_ACS(seg))); omap_writel(0x0004a1b3, EMIFS_CCS(seg)); /* synch mode 4 etc */ omap_writel(0x00000000, EMIFS_ACS(seg)); /* OE hold/setup */ |
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/* CF uses armxor_ck, which is "always" available */ pr_debug("%s: sts %04x cfg %04x control %04x %s ", driver_name, |
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omap_readw(CF_STATUS), omap_readw(CF_CFG), omap_readw(CF_CONTROL), |
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omap_cf_present() ? "present" : "(not present)"); cf->socket.owner = THIS_MODULE; |
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cf->socket.dev.parent = &pdev->dev; |
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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; |
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cf->socket.io[0].res = &cf->iomem; |
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status = pcmcia_register_socket(&cf->socket); if (status < 0) goto fail2; cf->active = 1; mod_timer(&cf->timer, jiffies + POLL_INTERVAL); return 0; fail2: |
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release_mem_region(cf->phys_cf, SZ_8K); fail1: |
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if (cf->socket.io_offset) iounmap((void __iomem *) cf->socket.io_offset); |
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free_irq(irq, cf); fail0: kfree(cf); return status; } |
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static int __exit omap_cf_remove(struct platform_device *pdev) |
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{ |
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struct omap_cf_socket *cf = platform_get_drvdata(pdev); |
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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; } |
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static struct platform_driver omap_cf_driver = { .driver = { .name = (char *) driver_name, }, .remove = __exit_p(omap_cf_remove), |
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}; static int __init omap_cf_init(void) { if (cpu_is_omap16xx()) |
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return platform_driver_probe(&omap_cf_driver, omap_cf_probe); |
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return -ENODEV; |
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} static void __exit omap_cf_exit(void) { if (cpu_is_omap16xx()) |
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platform_driver_unregister(&omap_cf_driver); |
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} module_init(omap_cf_init); module_exit(omap_cf_exit); MODULE_DESCRIPTION("OMAP CF Driver"); MODULE_LICENSE("GPL"); |
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MODULE_ALIAS("platform:omap_cf"); |