Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / pcmcia / pxa2xx_balloon3.c

diff --git a/kernel/drivers/pcmcia/pxa2xx_balloon3.c b/kernel/drivers/pcmcia/pxa2xx_balloon3.c
new file mode 100644 (file)
index 0000000..2ef576c
--- /dev/null
+++ b/kernel/drivers/pcmcia/pxa2xx_balloon3.c
@@ -0,0 +1,140 @@
+/*
+ * linux/drivers/pcmcia/pxa2xx_balloon3.c
+ *
+ * Balloon3 PCMCIA specific routines.
+ *
+ *  Author:    Nick Bane
+ *  Created:   June, 2006
+ *  Copyright: Toby Churchill Ltd
+ *  Derived from pxa2xx_mainstone.c, by Nico Pitre
+ *
+ * Various modification by Marek Vasut <marek.vasut@gmail.com>
+ *
+ * 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/module.h>
+#include <linux/gpio.h>
+#include <linux/errno.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/irq.h>
+#include <linux/io.h>
+
+#include <mach/balloon3.h>
+
+#include <asm/mach-types.h>
+
+#include "soc_common.h"
+
+static int balloon3_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
+{
+       uint16_t ver;
+
+       ver = __raw_readw(BALLOON3_FPGA_VER);
+       if (ver < 0x4f08)
+               pr_warn("The FPGA code, version 0x%04x, is too old. "
+                       "PCMCIA/CF support might be broken in this version!",
+                       ver);
+
+       skt->socket.pci_irq = BALLOON3_BP_CF_NRDY_IRQ;
+       skt->stat[SOC_STAT_CD].gpio = BALLOON3_GPIO_S0_CD;
+       skt->stat[SOC_STAT_CD].name = "PCMCIA0 CD";
+       skt->stat[SOC_STAT_BVD1].irq = BALLOON3_BP_NSTSCHG_IRQ;
+       skt->stat[SOC_STAT_BVD1].name = "PCMCIA0 STSCHG";
+
+       return 0;
+}
+
+static unsigned long balloon3_pcmcia_status[2] = {
+       BALLOON3_CF_nSTSCHG_BVD1,
+       BALLOON3_CF_nSTSCHG_BVD1
+};
+
+static void balloon3_pcmcia_socket_state(struct soc_pcmcia_socket *skt,
+                                   struct pcmcia_state *state)
+{
+       uint16_t status;
+       int flip;
+
+       /* This actually reads the STATUS register */
+       status = __raw_readw(BALLOON3_CF_STATUS_REG);
+       flip = (status ^ balloon3_pcmcia_status[skt->nr])
+               & BALLOON3_CF_nSTSCHG_BVD1;
+       /*
+        * Workaround for STSCHG which can't be deasserted:
+        * We therefore disable/enable corresponding IRQs
+        * as needed to avoid IRQ locks.
+        */
+       if (flip) {
+               balloon3_pcmcia_status[skt->nr] = status;
+               if (status & BALLOON3_CF_nSTSCHG_BVD1)
+                       enable_irq(BALLOON3_BP_NSTSCHG_IRQ);
+               else
+                       disable_irq(BALLOON3_BP_NSTSCHG_IRQ);
+       }
+
+       state->ready    = !!(status & BALLOON3_CF_nIRQ);
+       state->bvd1     = !!(status & BALLOON3_CF_nSTSCHG_BVD1);
+       state->bvd2     = 0;    /* not available */
+       state->vs_3v    = 1;    /* Always true its a CF card */
+       state->vs_Xv    = 0;    /* not available */
+}
+
+static int balloon3_pcmcia_configure_socket(struct soc_pcmcia_socket *skt,
+                                      const socket_state_t *state)
+{
+       __raw_writew(BALLOON3_CF_RESET, BALLOON3_CF_CONTROL_REG +
+                       ((state->flags & SS_RESET) ?
+                       BALLOON3_FPGA_SETnCLR : 0));
+       return 0;
+}
+
+static struct pcmcia_low_level balloon3_pcmcia_ops = {
+       .owner                  = THIS_MODULE,
+       .hw_init                = balloon3_pcmcia_hw_init,
+       .socket_state           = balloon3_pcmcia_socket_state,
+       .configure_socket       = balloon3_pcmcia_configure_socket,
+       .first                  = 0,
+       .nr                     = 1,
+};
+
+static struct platform_device *balloon3_pcmcia_device;
+
+static int __init balloon3_pcmcia_init(void)
+{
+       int ret;
+
+       if (!machine_is_balloon3())
+               return -ENODEV;
+
+       balloon3_pcmcia_device = platform_device_alloc("pxa2xx-pcmcia", -1);
+       if (!balloon3_pcmcia_device)
+               return -ENOMEM;
+
+       ret = platform_device_add_data(balloon3_pcmcia_device,
+                       &balloon3_pcmcia_ops, sizeof(balloon3_pcmcia_ops));
+
+       if (!ret)
+               ret = platform_device_add(balloon3_pcmcia_device);
+
+       if (ret)
+               platform_device_put(balloon3_pcmcia_device);
+
+       return ret;
+}
+
+static void __exit balloon3_pcmcia_exit(void)
+{
+       platform_device_unregister(balloon3_pcmcia_device);
+}
+
+module_init(balloon3_pcmcia_init);
+module_exit(balloon3_pcmcia_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Nick Bane <nick@cecomputing.co.uk>");
+MODULE_ALIAS("platform:pxa2xx-pcmcia");
+MODULE_DESCRIPTION("Balloon3 board CF/PCMCIA driver");