[PATCH 3/6] pcmcia: OMAP CF controller
Dominik Brodowski
linux at dominikbrodowski.net
Sun Aug 28 15:38:27 EDT 2005
From: David Brownell <dbrownell at users.sourceforge.net>
This adds a socket driver for the OMAP CF controller; it's currently
in use on OSK boards.
Signed-off-by: David Brownell <dbrownell at users.sourceforge.net>
Signed-off-by: Dominik Brodowski <linux at dominikbrodowski.net>
Index: 2.6.13-rc4-git1/drivers/pcmcia/Kconfig
===================================================================
--- 2.6.13-rc4-git1.orig/drivers/pcmcia/Kconfig
+++ 2.6.13-rc4-git1/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
Index: 2.6.13-rc4-git1/drivers/pcmcia/Makefile
===================================================================
--- 2.6.13-rc4-git1.orig/drivers/pcmcia/Makefile
+++ 2.6.13-rc4-git1/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
Index: 2.6.13-rc4-git1/drivers/pcmcia/omap_cf.c
===================================================================
--- /dev/null
+++ 2.6.13-rc4-git1/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");
More information about the linux-pcmcia
mailing list