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authorJohn Crispin <blogic@openwrt.org>2012-05-11 18:48:39 +0200
committerRalf Baechle <ralf@linux-mips.org>2012-05-21 14:31:52 +0100
commit5238f7bc356670ba702057c7de7f07909133f788 (patch)
tree44b2b896a3101e63a1d7497a60efc339e50b1dfa /drivers/gpio/gpio-stp-xway.c
parent57c8cb8f242988b8048a7058cd1edde025c6f232 (diff)
downloadlinux-5238f7bc356670ba702057c7de7f07909133f788.tar.bz2
GPIO: MIPS: lantiq: move gpio-stp and gpio-ebu to the subsystem folder
Move the 2 drivers from arch/mips/lantiq/xway/ to the subsystem and make them buildable. The following 2 patches will convert the drivers to OF. Signed-off-by: John Crispin <blogic@openwrt.org> Cc: linux-kernel@vger.kernel.org Cc: linux-mips@linux-mips.org Acked-by: Grant Likely <grant.likely@secretlab.ca> Patchwork: https://patchwork.linux-mips.org/patch/3838/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'drivers/gpio/gpio-stp-xway.c')
-rw-r--r--drivers/gpio/gpio-stp-xway.c152
1 files changed, 152 insertions, 0 deletions
diff --git a/drivers/gpio/gpio-stp-xway.c b/drivers/gpio/gpio-stp-xway.c
new file mode 100644
index 000000000000..d674f1be237d
--- /dev/null
+++ b/drivers/gpio/gpio-stp-xway.c
@@ -0,0 +1,152 @@
+/*
+ * 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.
+ *
+ * Copyright (C) 2007 John Crispin <blogic@openwrt.org>
+ *
+ */
+
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/export.h>
+#include <linux/types.h>
+#include <linux/platform_device.h>
+#include <linux/mutex.h>
+#include <linux/io.h>
+#include <linux/gpio.h>
+
+#include <lantiq_soc.h>
+
+#define LTQ_STP_CON0 0x00
+#define LTQ_STP_CON1 0x04
+#define LTQ_STP_CPU0 0x08
+#define LTQ_STP_CPU1 0x0C
+#define LTQ_STP_AR 0x10
+
+#define LTQ_STP_CON_SWU (1 << 31)
+#define LTQ_STP_2HZ 0
+#define LTQ_STP_4HZ (1 << 23)
+#define LTQ_STP_8HZ (2 << 23)
+#define LTQ_STP_10HZ (3 << 23)
+#define LTQ_STP_SPEED_MASK (0xf << 23)
+#define LTQ_STP_UPD_FPI (1 << 31)
+#define LTQ_STP_UPD_MASK (3 << 30)
+#define LTQ_STP_ADSL_SRC (3 << 24)
+
+#define LTQ_STP_GROUP0 (1 << 0)
+
+#define LTQ_STP_RISING 0
+#define LTQ_STP_FALLING (1 << 26)
+#define LTQ_STP_EDGE_MASK (1 << 26)
+
+#define ltq_stp_r32(reg) __raw_readl(ltq_stp_membase + reg)
+#define ltq_stp_w32(val, reg) __raw_writel(val, ltq_stp_membase + reg)
+#define ltq_stp_w32_mask(clear, set, reg) \
+ ltq_w32((ltq_r32(ltq_stp_membase + reg) & ~(clear)) | (set), \
+ ltq_stp_membase + (reg))
+
+static int ltq_stp_shadow = 0xffff;
+static void __iomem *ltq_stp_membase;
+
+static void ltq_stp_set(struct gpio_chip *chip, unsigned offset, int value)
+{
+ if (value)
+ ltq_stp_shadow |= (1 << offset);
+ else
+ ltq_stp_shadow &= ~(1 << offset);
+ ltq_stp_w32(ltq_stp_shadow, LTQ_STP_CPU0);
+}
+
+static int ltq_stp_direction_output(struct gpio_chip *chip, unsigned offset,
+ int value)
+{
+ ltq_stp_set(chip, offset, value);
+
+ return 0;
+}
+
+static struct gpio_chip ltq_stp_chip = {
+ .label = "ltq_stp",
+ .direction_output = ltq_stp_direction_output,
+ .set = ltq_stp_set,
+ .base = 48,
+ .ngpio = 24,
+ .can_sleep = 1,
+ .owner = THIS_MODULE,
+};
+
+static int ltq_stp_hw_init(void)
+{
+ /* sane defaults */
+ ltq_stp_w32(0, LTQ_STP_AR);
+ ltq_stp_w32(0, LTQ_STP_CPU0);
+ ltq_stp_w32(0, LTQ_STP_CPU1);
+ ltq_stp_w32(LTQ_STP_CON_SWU, LTQ_STP_CON0);
+ ltq_stp_w32(0, LTQ_STP_CON1);
+
+ /* rising or falling edge */
+ ltq_stp_w32_mask(LTQ_STP_EDGE_MASK, LTQ_STP_FALLING, LTQ_STP_CON0);
+
+ /* per default stp 15-0 are set */
+ ltq_stp_w32_mask(0, LTQ_STP_GROUP0, LTQ_STP_CON1);
+
+ /* stp are update periodically by the FPI bus */
+ ltq_stp_w32_mask(LTQ_STP_UPD_MASK, LTQ_STP_UPD_FPI, LTQ_STP_CON1);
+
+ /* set stp update speed */
+ ltq_stp_w32_mask(LTQ_STP_SPEED_MASK, LTQ_STP_8HZ, LTQ_STP_CON1);
+
+ /* tell the hardware that pin (led) 0 and 1 are controlled
+ * by the dsl arc
+ */
+ ltq_stp_w32_mask(0, LTQ_STP_ADSL_SRC, LTQ_STP_CON0);
+
+ ltq_pmu_enable(PMU_LED);
+ return 0;
+}
+
+static int __devinit ltq_stp_probe(struct platform_device *pdev)
+{
+ struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ int ret = 0;
+
+ if (!res)
+ return -ENOENT;
+ res = devm_request_mem_region(&pdev->dev, res->start,
+ resource_size(res), dev_name(&pdev->dev));
+ if (!res) {
+ dev_err(&pdev->dev, "failed to request STP memory\n");
+ return -EBUSY;
+ }
+ ltq_stp_membase = devm_ioremap_nocache(&pdev->dev, res->start,
+ resource_size(res));
+ if (!ltq_stp_membase) {
+ dev_err(&pdev->dev, "failed to remap STP memory\n");
+ return -ENOMEM;
+ }
+ ret = gpiochip_add(&ltq_stp_chip);
+ if (!ret)
+ ret = ltq_stp_hw_init();
+
+ return ret;
+}
+
+static struct platform_driver ltq_stp_driver = {
+ .probe = ltq_stp_probe,
+ .driver = {
+ .name = "ltq_stp",
+ .owner = THIS_MODULE,
+ },
+};
+
+int __init ltq_stp_init(void)
+{
+ int ret = platform_driver_register(&ltq_stp_driver);
+
+ if (ret)
+ pr_info("ltq_stp: error registering platfom driver");
+ return ret;
+}
+
+postcore_initcall(ltq_stp_init);