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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * omap_cf.c -- OMAP 16xx CompactFlash controller driver4 *5 * Copyright (c) 2005 David Brownell6 */7 8#include <linux/module.h>9#include <linux/kernel.h>10#include <linux/platform_device.h>11#include <linux/errno.h>12#include <linux/init.h>13#include <linux/delay.h>14#include <linux/interrupt.h>15#include <linux/slab.h>16 17#include <pcmcia/ss.h>18 19#include <asm/io.h>20#include <linux/sizes.h>21 22#include <linux/soc/ti/omap1-io.h>23#include <linux/soc/ti/omap1-soc.h>24#include <linux/soc/ti/omap1-mux.h>25 26/* NOTE: don't expect this to support many I/O cards. The 16xx chips have27 * hard-wired timings to support Compact Flash memory cards; they won't work28 * with various other devices (like WLAN adapters) without some external29 * logic to help out.30 *31 * NOTE: CF controller docs disagree with address space docs as to where32 * CF_BASE really lives; this is a doc erratum.33 */34#define CF_BASE 0xfffe280035 36/* status; read after IRQ */37#define CF_STATUS (CF_BASE + 0x00)38# define CF_STATUS_BAD_READ (1 << 2)39# define CF_STATUS_BAD_WRITE (1 << 1)40# define CF_STATUS_CARD_DETECT (1 << 0)41 42/* which chipselect (CS0..CS3) is used for CF (active low) */43#define CF_CFG (CF_BASE + 0x02)44 45/* card reset */46#define CF_CONTROL (CF_BASE + 0x04)47# define CF_CONTROL_RESET (1 << 0)48 49#define omap_cf_present() (!(omap_readw(CF_STATUS) & CF_STATUS_CARD_DETECT))50 51/*--------------------------------------------------------------------------*/52 53static const char driver_name[] = "omap_cf";54 55struct omap_cf_socket {56 struct pcmcia_socket socket;57 58 struct timer_list timer;59 unsigned present:1;60 unsigned active:1;61 62 struct platform_device *pdev;63 unsigned long phys_cf;64 u_int irq;65 struct resource iomem;66};67 68#define POLL_INTERVAL (2 * HZ)69 70/*--------------------------------------------------------------------------*/71 72static int omap_cf_ss_init(struct pcmcia_socket *s)73{74 return 0;75}76 77/* the timer is primarily to kick this socket's pccardd */78static void omap_cf_timer(struct timer_list *t)79{80 struct omap_cf_socket *cf = from_timer(cf, t, timer);81 unsigned present = omap_cf_present();82 83 if (present != cf->present) {84 cf->present = present;85 pr_debug("%s: card %s\n", driver_name,86 present ? "present" : "gone");87 pcmcia_parse_events(&cf->socket, SS_DETECT);88 }89 90 if (cf->active)91 mod_timer(&cf->timer, jiffies + POLL_INTERVAL);92}93 94/* This irq handler prevents "irqNNN: nobody cared" messages as drivers95 * claim the card's IRQ. It may also detect some card insertions, but96 * not removals; it can't always eliminate timer irqs.97 */98static irqreturn_t omap_cf_irq(int irq, void *_cf)99{100 struct omap_cf_socket *cf = (struct omap_cf_socket *)_cf;101 102 omap_cf_timer(&cf->timer);103 return IRQ_HANDLED;104}105 106static int omap_cf_get_status(struct pcmcia_socket *s, u_int *sp)107{108 if (!sp)109 return -EINVAL;110 111 /* NOTE CF is always 3VCARD */112 if (omap_cf_present()) {113 struct omap_cf_socket *cf;114 115 *sp = SS_READY | SS_DETECT | SS_POWERON | SS_3VCARD;116 cf = container_of(s, struct omap_cf_socket, socket);117 s->pcmcia_irq = 0;118 s->pci_irq = cf->irq;119 } else120 *sp = 0;121 return 0;122}123 124static int125omap_cf_set_socket(struct pcmcia_socket *sock, struct socket_state_t *s)126{127 /* REVISIT some non-OSK boards may support power switching */128 switch (s->Vcc) {129 case 0:130 case 33:131 break;132 default:133 return -EINVAL;134 }135 136 omap_readw(CF_CONTROL);137 if (s->flags & SS_RESET)138 omap_writew(CF_CONTROL_RESET, CF_CONTROL);139 else140 omap_writew(0, CF_CONTROL);141 142 pr_debug("%s: Vcc %d, io_irq %d, flags %04x csc %04x\n",143 driver_name, s->Vcc, s->io_irq, s->flags, s->csc_mask);144 145 return 0;146}147 148static int omap_cf_ss_suspend(struct pcmcia_socket *s)149{150 pr_debug("%s: %s\n", driver_name, __func__);151 return omap_cf_set_socket(s, &dead_socket);152}153 154/* regions are 2K each: mem, attrib, io (and reserved-for-ide) */155 156static int157omap_cf_set_io_map(struct pcmcia_socket *s, struct pccard_io_map *io)158{159 struct omap_cf_socket *cf;160 161 cf = container_of(s, struct omap_cf_socket, socket);162 io->flags &= MAP_ACTIVE|MAP_ATTRIB|MAP_16BIT;163 io->start = cf->phys_cf + SZ_4K;164 io->stop = io->start + SZ_2K - 1;165 return 0;166}167 168static int169omap_cf_set_mem_map(struct pcmcia_socket *s, struct pccard_mem_map *map)170{171 struct omap_cf_socket *cf;172 173 if (map->card_start)174 return -EINVAL;175 cf = container_of(s, struct omap_cf_socket, socket);176 map->static_start = cf->phys_cf;177 map->flags &= MAP_ACTIVE|MAP_ATTRIB|MAP_16BIT;178 if (map->flags & MAP_ATTRIB)179 map->static_start += SZ_2K;180 return 0;181}182 183static struct pccard_operations omap_cf_ops = {184 .init = omap_cf_ss_init,185 .suspend = omap_cf_ss_suspend,186 .get_status = omap_cf_get_status,187 .set_socket = omap_cf_set_socket,188 .set_io_map = omap_cf_set_io_map,189 .set_mem_map = omap_cf_set_mem_map,190};191 192/*--------------------------------------------------------------------------*/193 194/*195 * NOTE: right now the only board-specific platform_data is196 * "what chipselect is used". Boards could want more.197 */198 199static int __init omap_cf_probe(struct platform_device *pdev)200{201 unsigned seg;202 struct omap_cf_socket *cf;203 int irq;204 int status;205 struct resource *res;206 struct resource iospace = DEFINE_RES_IO(SZ_64, SZ_4K);207 208 seg = (int) pdev->dev.platform_data;209 if (seg == 0 || seg > 3)210 return -ENODEV;211 212 /* either CFLASH.IREQ (INT_1610_CF) or some GPIO */213 irq = platform_get_irq(pdev, 0);214 if (irq < 0)215 return -EINVAL;216 217 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);218 219 cf = kzalloc(sizeof *cf, GFP_KERNEL);220 if (!cf)221 return -ENOMEM;222 timer_setup(&cf->timer, omap_cf_timer, 0);223 224 cf->pdev = pdev;225 platform_set_drvdata(pdev, cf);226 227 /* this primarily just shuts up irq handling noise */228 status = request_irq(irq, omap_cf_irq, IRQF_SHARED,229 driver_name, cf);230 if (status < 0)231 goto fail0;232 cf->irq = irq;233 cf->socket.pci_irq = irq;234 cf->phys_cf = res->start;235 236 /* pcmcia layer only remaps "real" memory */237 cf->socket.io_offset = iospace.start;238 status = pci_remap_iospace(&iospace, cf->phys_cf + SZ_4K);239 if (status) {240 status = -ENOMEM;241 goto fail1;242 }243 244 if (!request_mem_region(cf->phys_cf, SZ_8K, driver_name)) {245 status = -ENXIO;246 goto fail1;247 }248 249 /* NOTE: CF conflicts with MMC1 */250 omap_cfg_reg(W11_1610_CF_CD1);251 omap_cfg_reg(P11_1610_CF_CD2);252 omap_cfg_reg(R11_1610_CF_IOIS16);253 omap_cfg_reg(V10_1610_CF_IREQ);254 omap_cfg_reg(W10_1610_CF_RESET);255 256 omap_writew(~(1 << seg), CF_CFG);257 258 pr_info("%s: cs%d on irq %d\n", driver_name, seg, irq);259 260 /* CF uses armxor_ck, which is "always" available */261 262 pr_debug("%s: sts %04x cfg %04x control %04x %s\n", driver_name,263 omap_readw(CF_STATUS), omap_readw(CF_CFG),264 omap_readw(CF_CONTROL),265 omap_cf_present() ? "present" : "(not present)");266 267 cf->socket.owner = THIS_MODULE;268 cf->socket.dev.parent = &pdev->dev;269 cf->socket.ops = &omap_cf_ops;270 cf->socket.resource_ops = &pccard_static_ops;271 cf->socket.features = SS_CAP_PCCARD | SS_CAP_STATIC_MAP272 | SS_CAP_MEM_ALIGN;273 cf->socket.map_size = SZ_2K;274 cf->socket.io[0].res = &cf->iomem;275 276 status = pcmcia_register_socket(&cf->socket);277 if (status < 0)278 goto fail2;279 280 cf->active = 1;281 mod_timer(&cf->timer, jiffies + POLL_INTERVAL);282 return 0;283 284fail2:285 release_mem_region(cf->phys_cf, SZ_8K);286fail1:287 free_irq(irq, cf);288fail0:289 kfree(cf);290 return status;291}292 293static void __exit omap_cf_remove(struct platform_device *pdev)294{295 struct omap_cf_socket *cf = platform_get_drvdata(pdev);296 297 cf->active = 0;298 pcmcia_unregister_socket(&cf->socket);299 timer_shutdown_sync(&cf->timer);300 release_mem_region(cf->phys_cf, SZ_8K);301 free_irq(cf->irq, cf);302 kfree(cf);303}304 305static struct platform_driver omap_cf_driver = {306 .driver = {307 .name = driver_name,308 },309 .remove_new = __exit_p(omap_cf_remove),310};311 312static int __init omap_cf_init(void)313{314 if (cpu_is_omap16xx())315 return platform_driver_probe(&omap_cf_driver, omap_cf_probe);316 return -ENODEV;317}318 319static void __exit omap_cf_exit(void)320{321 if (cpu_is_omap16xx())322 platform_driver_unregister(&omap_cf_driver);323}324 325module_init(omap_cf_init);326module_exit(omap_cf_exit);327 328MODULE_DESCRIPTION("OMAP CF Driver");329MODULE_LICENSE("GPL");330MODULE_ALIAS("platform:omap_cf");331