[PATCH] pcmcia: AT91RM9200 Compact Flash driver
This patch adds support for the Compact Flash controller integrated in
the Atmel AT91RM9200 processor.
Signed-off-by: Andrew Victor <andrew@sanpeople.com
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
diff --git a/drivers/pcmcia/Kconfig b/drivers/pcmcia/Kconfig
index 1f4ad0e..cba6c9e 100644
--- a/drivers/pcmcia/Kconfig
+++ b/drivers/pcmcia/Kconfig
@@ -263,6 +263,13 @@
Say Y here to support the CompactFlash controller on OMAP.
Note that this doesn't support "True IDE" mode.
+config AT91_CF
+ tristate "AT91 CompactFlash Controller"
+ depends on PCMCIA && ARCH_AT91RM9200
+ help
+ Say Y here to support the CompactFlash controller on AT91 chips.
+ Or choose M to compile the driver as a module named "at91_cf".
+
config PCCARD_NONSTATIC
tristate
diff --git a/drivers/pcmcia/Makefile b/drivers/pcmcia/Makefile
index 22e17fd..4276965 100644
--- a/drivers/pcmcia/Makefile
+++ b/drivers/pcmcia/Makefile
@@ -36,6 +36,7 @@
obj-$(CONFIG_PCMCIA_VRC4171) += vrc4171_card.o
obj-$(CONFIG_PCMCIA_VRC4173) += vrc4173_cardu.o
obj-$(CONFIG_OMAP_CF) += omap_cf.o
+obj-$(CONFIG_AT91_CF) += at91_cf.o
sa11xx_core-y += soc_common.o sa11xx_base.o
pxa2xx_core-y += soc_common.o pxa2xx_base.o
diff --git a/drivers/pcmcia/at91_cf.c b/drivers/pcmcia/at91_cf.c
new file mode 100644
index 0000000..67cc5f7
--- /dev/null
+++ b/drivers/pcmcia/at91_cf.c
@@ -0,0 +1,365 @@
+/*
+ * at91_cf.c -- AT91 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/platform_device.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+
+#include <pcmcia/ss.h>
+
+#include <asm/hardware.h>
+#include <asm/io.h>
+#include <asm/sizes.h>
+
+#include <asm/arch/at91rm9200.h>
+#include <asm/arch/board.h>
+#include <asm/arch/gpio.h>
+
+
+#define CF_SIZE 0x30000000 /* CS5+CS6: unavailable */
+
+/*
+ * A0..A10 work in each range; A23 indicates I/O space; A25 is CFRNW;
+ * some other bit in {A24,A22..A11} is nREG to flag memory access
+ * (vs attributes). So more than 2KB/region would just be waste.
+ */
+#define CF_ATTR_PHYS (AT91_CF_BASE)
+#define CF_IO_PHYS (AT91_CF_BASE + (1 << 23))
+#define CF_MEM_PHYS (AT91_CF_BASE + 0x017ff800)
+
+/*--------------------------------------------------------------------------*/
+
+static const char driver_name[] = "at91_cf";
+
+struct at91_cf_socket {
+ struct pcmcia_socket socket;
+
+ unsigned present:1;
+
+ struct platform_device *pdev;
+ struct at91_cf_data *board;
+};
+
+#define SZ_2K (2 * SZ_1K)
+
+static inline int at91_cf_present(struct at91_cf_socket *cf)
+{
+ return !at91_get_gpio_value(cf->board->det_pin);
+}
+
+/*--------------------------------------------------------------------------*/
+
+static int at91_cf_ss_init(struct pcmcia_socket *s)
+{
+ return 0;
+}
+
+static irqreturn_t at91_cf_irq(int irq, void *_cf, struct pt_regs *r)
+{
+ struct at91_cf_socket *cf = (struct at91_cf_socket *) _cf;
+
+ if (irq == cf->board->det_pin) {
+ unsigned present = at91_cf_present(cf);
+
+ /* kick pccard as needed */
+ 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);
+ }
+ }
+
+ return IRQ_HANDLED;
+}
+
+static int at91_cf_get_status(struct pcmcia_socket *s, u_int *sp)
+{
+ struct at91_cf_socket *cf;
+
+ if (!sp)
+ return -EINVAL;
+
+ cf = container_of(s, struct at91_cf_socket, socket);
+
+ /* NOTE: we assume 3VCARD, not XVCARD... */
+ if (at91_cf_present(cf)) {
+ int rdy = cf->board->irq_pin; /* RDY/nIRQ */
+ int vcc = cf->board->vcc_pin;
+
+ *sp = SS_DETECT | SS_3VCARD;
+ if (!rdy || at91_get_gpio_value(rdy))
+ *sp |= SS_READY;
+ if (!vcc || at91_get_gpio_value(vcc))
+ *sp |= SS_POWERON;
+ } else
+ *sp = 0;
+
+ return 0;
+}
+
+static int at91_cf_set_socket(struct pcmcia_socket *sock, struct socket_state_t *s)
+{
+ struct at91_cf_socket *cf;
+
+ cf = container_of(sock, struct at91_cf_socket, socket);
+
+ /* switch Vcc if needed and possible */
+ if (cf->board->vcc_pin) {
+ switch (s->Vcc) {
+ case 0:
+ at91_set_gpio_value(cf->board->vcc_pin, 0);
+ break;
+ case 33:
+ at91_set_gpio_value(cf->board->vcc_pin, 1);
+ break;
+ default:
+ return -EINVAL;
+ }
+ }
+
+ /* toggle reset if needed */
+ at91_set_gpio_value(cf->board->rst_pin, s->flags & SS_RESET);
+
+ 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 at91_cf_ss_suspend(struct pcmcia_socket *s)
+{
+ return at91_cf_set_socket(s, &dead_socket);
+}
+
+/* we already mapped the I/O region */
+static int at91_cf_set_io_map(struct pcmcia_socket *s, struct pccard_io_map *io)
+{
+ struct at91_cf_socket *cf;
+ u32 csr;
+
+ cf = container_of(s, struct at91_cf_socket, socket);
+ io->flags &= (MAP_ACTIVE | MAP_16BIT | MAP_AUTOSZ);
+
+ /*
+ * Use 16 bit accesses unless/until we need 8-bit i/o space.
+ * Always set CSR4 ... PCMCIA won't always unmap things.
+ */
+ csr = at91_sys_read(AT91_SMC_CSR(4)) & ~AT91_SMC_DBW;
+
+ /*
+ * NOTE: this CF controller ignores IOIS16, so we can't really do
+ * MAP_AUTOSZ. The 16bit mode allows single byte access on either
+ * D0-D7 (even addr) or D8-D15 (odd), so it's close enough for many
+ * purposes (and handles ide-cs).
+ *
+ * The 8bit mode is needed for odd byte access on D0-D7. It seems
+ * some cards only like that way to get at the odd byte, despite
+ * CF 3.0 spec table 35 also giving the D8-D15 option.
+ */
+ if (!(io->flags & (MAP_16BIT|MAP_AUTOSZ))) {
+ csr |= AT91_SMC_DBW_8;
+ pr_debug("%s: 8bit i/o bus\n", driver_name);
+ } else {
+ csr |= AT91_SMC_DBW_16;
+ pr_debug("%s: 16bit i/o bus\n", driver_name);
+ }
+ at91_sys_write(AT91_SMC_CSR(4), csr);
+
+ io->start = cf->socket.io_offset;
+ io->stop = io->start + SZ_2K - 1;
+
+ return 0;
+}
+
+/* pcmcia layer maps/unmaps mem regions */
+static int at91_cf_set_mem_map(struct pcmcia_socket *s, struct pccard_mem_map *map)
+{
+ struct at91_cf_socket *cf;
+
+ if (map->card_start)
+ return -EINVAL;
+
+ cf = container_of(s, struct at91_cf_socket, socket);
+
+ map->flags &= MAP_ACTIVE|MAP_ATTRIB|MAP_16BIT;
+ if (map->flags & MAP_ATTRIB)
+ map->static_start = CF_ATTR_PHYS;
+ else
+ map->static_start = CF_MEM_PHYS;
+
+ return 0;
+}
+
+static struct pccard_operations at91_cf_ops = {
+ .init = at91_cf_ss_init,
+ .suspend = at91_cf_ss_suspend,
+ .get_status = at91_cf_get_status,
+ .set_socket = at91_cf_set_socket,
+ .set_io_map = at91_cf_set_io_map,
+ .set_mem_map = at91_cf_set_mem_map,
+};
+
+/*--------------------------------------------------------------------------*/
+
+static int __init at91_cf_probe(struct device *dev)
+{
+ struct at91_cf_socket *cf;
+ struct at91_cf_data *board = dev->platform_data;
+ struct platform_device *pdev = to_platform_device(dev);
+ unsigned int csa;
+ int status;
+
+ if (!board || !board->det_pin || !board->rst_pin)
+ return -ENODEV;
+
+ cf = kcalloc(1, sizeof *cf, GFP_KERNEL);
+ if (!cf)
+ return -ENOMEM;
+
+ cf->board = board;
+ cf->pdev = pdev;
+ dev_set_drvdata(dev, cf);
+
+ /* CF takes over CS4, CS5, CS6 */
+ csa = at91_sys_read(AT91_EBI_CSA);
+ at91_sys_write(AT91_EBI_CSA, csa | AT91_EBI_CS4A_SMC_COMPACTFLASH);
+
+ /* force poweron defaults for these pins ... */
+ (void) at91_set_A_periph(AT91_PIN_PC9, 0); /* A25/CFRNW */
+ (void) at91_set_A_periph(AT91_PIN_PC10, 0); /* NCS4/CFCS */
+ (void) at91_set_A_periph(AT91_PIN_PC11, 0); /* NCS5/CFCE1 */
+ (void) at91_set_A_periph(AT91_PIN_PC12, 0); /* NCS6/CFCE2 */
+
+ /* nWAIT is _not_ a default setting */
+ (void) at91_set_A_periph(AT91_PIN_PC6, 1); /* nWAIT */
+
+ /*
+ * Static memory controller timing adjustments.
+ * REVISIT: these timings are in terms of MCK cycles, so
+ * when MCK changes (cpufreq etc) so must these values...
+ */
+ at91_sys_write(AT91_SMC_CSR(4), AT91_SMC_ACSS_STD | AT91_SMC_DBW_16 | AT91_SMC_BAT | AT91_SMC_WSEN
+ | AT91_SMC_NWS_(32) /* wait states */
+ | AT91_SMC_RWSETUP_(6) /* setup time */
+ | AT91_SMC_RWHOLD_(4) /* hold time */
+ );
+
+ /* must be a GPIO; ergo must trigger on both edges */
+ status = request_irq(board->det_pin, at91_cf_irq,
+ SA_SAMPLE_RANDOM, driver_name, cf);
+ if (status < 0)
+ goto fail0;
+
+ /*
+ * The card driver will request this irq later as needed.
+ * but it causes lots of "irqNN: nobody cared" messages
+ * unless we report that we handle everything (sigh).
+ * (Note: DK board doesn't wire the IRQ pin...)
+ */
+ if (board->irq_pin) {
+ status = request_irq(board->irq_pin, at91_cf_irq,
+ SA_SHIRQ, driver_name, cf);
+ if (status < 0)
+ goto fail0a;
+ cf->socket.pci_irq = board->irq_pin;
+ }
+ else
+ cf->socket.pci_irq = NR_IRQS + 1;
+
+ /* pcmcia layer only remaps "real" memory not iospace */
+ cf->socket.io_offset = (unsigned long) ioremap(CF_IO_PHYS, SZ_2K);
+ if (!cf->socket.io_offset)
+ goto fail1;
+
+ /* reserve CS4, CS5, and CS6 regions; but use just CS4 */
+ if (!request_mem_region(AT91_CF_BASE, CF_SIZE, driver_name))
+ goto fail1;
+
+ pr_info("%s: irqs det #%d, io #%d\n", driver_name,
+ board->det_pin, board->irq_pin);
+
+ cf->socket.owner = THIS_MODULE;
+ cf->socket.dev.dev = dev;
+ cf->socket.ops = &at91_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].NumPorts = SZ_2K;
+
+ status = pcmcia_register_socket(&cf->socket);
+ if (status < 0)
+ goto fail2;
+
+ return 0;
+
+fail2:
+ iounmap((void __iomem *) cf->socket.io_offset);
+ release_mem_region(AT91_CF_BASE, CF_SIZE);
+fail1:
+ if (board->irq_pin)
+ free_irq(board->irq_pin, cf);
+fail0a:
+ free_irq(board->det_pin, cf);
+fail0:
+ at91_sys_write(AT91_EBI_CSA, csa);
+ kfree(cf);
+ return status;
+}
+
+static int __exit at91_cf_remove(struct device *dev)
+{
+ struct at91_cf_socket *cf = dev_get_drvdata(dev);
+ unsigned int csa;
+
+ pcmcia_unregister_socket(&cf->socket);
+ free_irq(cf->board->irq_pin, cf);
+ free_irq(cf->board->det_pin, cf);
+ iounmap((void __iomem *) cf->socket.io_offset);
+ release_mem_region(AT91_CF_BASE, CF_SIZE);
+
+ csa = at91_sys_read(AT91_EBI_CSA);
+ at91_sys_write(AT91_EBI_CSA, csa & ~AT91_EBI_CS4A);
+
+ kfree(cf);
+ return 0;
+}
+
+static struct device_driver at91_cf_driver = {
+ .name = (char *) driver_name,
+ .bus = &platform_bus_type,
+ .probe = at91_cf_probe,
+ .remove = __exit_p(at91_cf_remove),
+ .suspend = pcmcia_socket_dev_suspend,
+ .resume = pcmcia_socket_dev_resume,
+};
+
+/*--------------------------------------------------------------------------*/
+
+static int __init at91_cf_init(void)
+{
+ return driver_register(&at91_cf_driver);
+}
+module_init(at91_cf_init);
+
+static void __exit at91_cf_exit(void)
+{
+ driver_unregister(&at91_cf_driver);
+}
+module_exit(at91_cf_exit);
+
+MODULE_DESCRIPTION("AT91 Compact Flash Driver");
+MODULE_AUTHOR("David Brownell");
+MODULE_LICENSE("GPL");