diff options
Diffstat (limited to 'drivers/pcmcia/sa1100_nanoengine.c')
| -rw-r--r-- | drivers/pcmcia/sa1100_nanoengine.c | 219 |
1 files changed, 219 insertions, 0 deletions
diff --git a/drivers/pcmcia/sa1100_nanoengine.c b/drivers/pcmcia/sa1100_nanoengine.c new file mode 100644 index 000000000000..3d2652e2f5ae --- /dev/null +++ b/drivers/pcmcia/sa1100_nanoengine.c @@ -0,0 +1,219 @@ +/* + * drivers/pcmcia/sa1100_nanoengine.c + * + * PCMCIA implementation routines for BSI nanoEngine. + * + * In order to have a fully functional pcmcia subsystem in a BSE nanoEngine + * board you should carefully read this: + * http://cambuca.ldhs.cetuc.puc-rio.br/nanoengine/ + * + * Copyright (C) 2010 Marcelo Roberto Jimenez <mroberto@cpti.cetuc.puc-rio.br> + * + * Based on original work for kernel 2.4 by + * Miguel Freitas <miguel@cpti.cetuc.puc-rio.br> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + */ +#include <linux/device.h> +#include <linux/errno.h> +#include <linux/interrupt.h> +#include <linux/irq.h> +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/signal.h> + +#include <asm/mach-types.h> +#include <asm/irq.h> + +#include <mach/hardware.h> +#include <mach/nanoengine.h> + +#include "sa1100_generic.h" + +static struct pcmcia_irqs irqs_skt0[] = { + /* socket, IRQ, name */ + { 0, NANOENGINE_IRQ_GPIO_PC_CD0, "PC CD0" }, +}; + +static struct pcmcia_irqs irqs_skt1[] = { + /* socket, IRQ, name */ + { 1, NANOENGINE_IRQ_GPIO_PC_CD1, "PC CD1" }, +}; + +struct nanoengine_pins { + unsigned input_pins; + unsigned output_pins; + unsigned clear_outputs; + unsigned transition_pins; + unsigned pci_irq; + struct pcmcia_irqs *pcmcia_irqs; + unsigned pcmcia_irqs_size; +}; + +static struct nanoengine_pins nano_skts[] = { + { + .input_pins = GPIO_PC_READY0 | GPIO_PC_CD0, + .output_pins = GPIO_PC_RESET0, + .clear_outputs = GPIO_PC_RESET0, + .transition_pins = NANOENGINE_IRQ_GPIO_PC_CD0, + .pci_irq = NANOENGINE_IRQ_GPIO_PC_READY0, + .pcmcia_irqs = irqs_skt0, + .pcmcia_irqs_size = ARRAY_SIZE(irqs_skt0) + }, { + .input_pins = GPIO_PC_READY1 | GPIO_PC_CD1, + .output_pins = GPIO_PC_RESET1, + .clear_outputs = GPIO_PC_RESET1, + .transition_pins = NANOENGINE_IRQ_GPIO_PC_CD1, + .pci_irq = NANOENGINE_IRQ_GPIO_PC_READY1, + .pcmcia_irqs = irqs_skt1, + .pcmcia_irqs_size = ARRAY_SIZE(irqs_skt1) + } +}; + +unsigned num_nano_pcmcia_sockets = ARRAY_SIZE(nano_skts); + +static int nanoengine_pcmcia_hw_init(struct soc_pcmcia_socket *skt) +{ + unsigned i = skt->nr; + + if (i >= num_nano_pcmcia_sockets) + return -ENXIO; + + GPDR &= ~nano_skts[i].input_pins; + GPDR |= nano_skts[i].output_pins; + GPCR = nano_skts[i].clear_outputs; + set_irq_type(nano_skts[i].transition_pins, IRQ_TYPE_EDGE_BOTH); + skt->socket.pci_irq = nano_skts[i].pci_irq; + + return soc_pcmcia_request_irqs(skt, + nano_skts[i].pcmcia_irqs, nano_skts[i].pcmcia_irqs_size); +} + +/* + * Release all resources. + */ +static void nanoengine_pcmcia_hw_shutdown(struct soc_pcmcia_socket *skt) +{ + unsigned i = skt->nr; + + if (i >= num_nano_pcmcia_sockets) + return; + + soc_pcmcia_free_irqs(skt, + nano_skts[i].pcmcia_irqs, nano_skts[i].pcmcia_irqs_size); +} + +static int nanoengine_pcmcia_configure_socket( + struct soc_pcmcia_socket *skt, const socket_state_t *state) +{ + unsigned reset; + unsigned i = skt->nr; + + if (i >= num_nano_pcmcia_sockets) + return -ENXIO; + + switch (i) { + case 0: + reset = GPIO_PC_RESET0; + break; + case 1: + reset = GPIO_PC_RESET1; + break; + default: + return -ENXIO; + } + + if (state->flags & SS_RESET) + GPSR = reset; + else + GPCR = reset; + + return 0; +} + +static void nanoengine_pcmcia_socket_state( + struct soc_pcmcia_socket *skt, struct pcmcia_state *state) +{ + unsigned long levels = GPLR; + unsigned i = skt->nr; + + if (i >= num_nano_pcmcia_sockets) + return; + + memset(state, 0, sizeof(struct pcmcia_state)); + switch (i) { + case 0: + state->ready = (levels & GPIO_PC_READY0) ? 1 : 0; + state->detect = !(levels & GPIO_PC_CD0) ? 1 : 0; + break; + case 1: + state->ready = (levels & GPIO_PC_READY1) ? 1 : 0; + state->detect = !(levels & GPIO_PC_CD1) ? 1 : 0; + break; + default: + return; + } + state->bvd1 = 1; + state->bvd2 = 1; + state->wrprot = 0; /* Not available */ + state->vs_3v = 1; /* Can only apply 3.3V */ + state->vs_Xv = 0; +} + +/* + * Enable card status IRQs on (re-)initialisation. This can + * be called at initialisation, power management event, or + * pcmcia event. + */ +static void nanoengine_pcmcia_socket_init(struct soc_pcmcia_socket *skt) +{ + unsigned i = skt->nr; + + if (i >= num_nano_pcmcia_sockets) + return; + + soc_pcmcia_enable_irqs(skt, + nano_skts[i].pcmcia_irqs, nano_skts[i].pcmcia_irqs_size); +} + +/* + * Disable card status IRQs on suspend. + */ +static void nanoengine_pcmcia_socket_suspend(struct soc_pcmcia_socket *skt) +{ + unsigned i = skt->nr; + + if (i >= num_nano_pcmcia_sockets) + return; + + soc_pcmcia_disable_irqs(skt, + nano_skts[i].pcmcia_irqs, nano_skts[i].pcmcia_irqs_size); +} + +static struct pcmcia_low_level nanoengine_pcmcia_ops = { + .owner = THIS_MODULE, + + .hw_init = nanoengine_pcmcia_hw_init, + .hw_shutdown = nanoengine_pcmcia_hw_shutdown, + + .configure_socket = nanoengine_pcmcia_configure_socket, + .socket_state = nanoengine_pcmcia_socket_state, + .socket_init = nanoengine_pcmcia_socket_init, + .socket_suspend = nanoengine_pcmcia_socket_suspend, +}; + +int pcmcia_nanoengine_init(struct device *dev) +{ + int ret = -ENODEV; + + if (machine_is_nanoengine()) + ret = sa11xx_drv_pcmcia_probe( + dev, &nanoengine_pcmcia_ops, 0, 2); + + return ret; +} + |