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authorSebastien Requiem <sebastien@kolios.dk>2010-02-23 14:38:14 +0100
committerNicolas Pitre <nico@fluxnic.net>2010-02-23 16:44:01 -0500
commitee40ceab234d34abdfeb9922d0f1a18bfa7efdaf (patch)
treecc84490428a946c0614a91c32ed4d30d0b4e9e61 /arch/arm/mach-mv78xx0/mpp.c
parentd5b5746bed1023e4a55f96405422d3e51968fa43 (diff)
downloadlinux-linaro-stable-ee40ceab234d34abdfeb9922d0f1a18bfa7efdaf.tar.gz
[ARM] MV78XX0: MPP routines and definitions
This patch is composed of two new files : - mpp.c which is mainly inspired by the same file as in mach-kirkwood - mpp.h that is written from the documentation provided by Marvell http://www.marvell.com/products/processors/embedded/discovery_innovation/HW_MV78100_OpenSource.pdf Moreover, due to some implementation problem, I have defined some MPPX_UNUSED that offer developers the possibility to SET MPP to some unused value (such as for Buffalo WXL). Note: This patch doesn't support MV78200 yet (only 78100 MPP lines have been written) Signed-off-by: Sebastien Requiem <sebastien@kolios.dk> Signed-off-by: Nicolas Pitre <nico@marvell.com>
Diffstat (limited to 'arch/arm/mach-mv78xx0/mpp.c')
-rw-r--r--arch/arm/mach-mv78xx0/mpp.c96
1 files changed, 96 insertions, 0 deletions
diff --git a/arch/arm/mach-mv78xx0/mpp.c b/arch/arm/mach-mv78xx0/mpp.c
new file mode 100644
index 000000000000..354ac514eb89
--- /dev/null
+++ b/arch/arm/mach-mv78xx0/mpp.c
@@ -0,0 +1,96 @@
+/*
+ * arch/arm/mach-mv78x00/mpp.c
+ *
+ * MPP functions for Marvell MV78x00 SoCs
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/mbus.h>
+#include <linux/io.h>
+#include <asm/gpio.h>
+#include <mach/hardware.h>
+#include "common.h"
+#include "mpp.h"
+
+static unsigned int __init mv78xx0_variant(void)
+{
+ u32 dev, rev;
+
+ mv78xx0_pcie_id(&dev, &rev);
+
+ if (dev == MV78100_DEV_ID && rev >= MV78100_REV_A0)
+ return MPP_78100_A0_MASK;
+
+ printk(KERN_ERR "MPP setup: unknown mv78x00 variant "
+ "(dev %#x rev %#x)\n", dev, rev);
+ return 0;
+}
+
+#define MPP_CTRL(i) (DEV_BUS_VIRT_BASE + (i) * 4)
+#define MPP_NR_REGS (1 + MPP_MAX/8)
+
+void __init mv78xx0_mpp_conf(unsigned int *mpp_list)
+{
+ u32 mpp_ctrl[MPP_NR_REGS];
+ unsigned int variant_mask;
+ int i;
+
+ variant_mask = mv78xx0_variant();
+ if (!variant_mask)
+ return;
+
+ /* Initialize gpiolib. */
+ orion_gpio_init();
+
+ printk(KERN_DEBUG "initial MPP regs:");
+ for (i = 0; i < MPP_NR_REGS; i++) {
+ mpp_ctrl[i] = readl(MPP_CTRL(i));
+ printk(" %08x", mpp_ctrl[i]);
+ }
+ printk("\n");
+
+ while (*mpp_list) {
+ unsigned int num = MPP_NUM(*mpp_list);
+ unsigned int sel = MPP_SEL(*mpp_list);
+ int shift, gpio_mode;
+
+ if (num > MPP_MAX) {
+ printk(KERN_ERR "mv78xx0_mpp_conf: invalid MPP "
+ "number (%u)\n", num);
+ continue;
+ }
+ if (!(*mpp_list & variant_mask)) {
+ printk(KERN_WARNING
+ "mv78xx0_mpp_conf: requested MPP%u config "
+ "unavailable on this hardware\n", num);
+ continue;
+ }
+
+ shift = (num & 7) << 2;
+ mpp_ctrl[num / 8] &= ~(0xf << shift);
+ mpp_ctrl[num / 8] |= sel << shift;
+
+ gpio_mode = 0;
+ if (*mpp_list & MPP_INPUT_MASK)
+ gpio_mode |= GPIO_INPUT_OK;
+ if (*mpp_list & MPP_OUTPUT_MASK)
+ gpio_mode |= GPIO_OUTPUT_OK;
+ if (sel != 0)
+ gpio_mode = 0;
+ orion_gpio_set_valid(num, gpio_mode);
+
+ mpp_list++;
+ }
+
+ printk(KERN_DEBUG " final MPP regs:");
+ for (i = 0; i < MPP_NR_REGS; i++) {
+ writel(mpp_ctrl[i], MPP_CTRL(i));
+ printk(" %08x", mpp_ctrl[i]);
+ }
+ printk("\n");
+}