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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /arch/arm/mach-dove/mpp.c
Initial import
Diffstat (limited to 'arch/arm/mach-dove/mpp.c')
-rw-r--r--arch/arm/mach-dove/mpp.c162
1 files changed, 162 insertions, 0 deletions
diff --git a/arch/arm/mach-dove/mpp.c b/arch/arm/mach-dove/mpp.c
new file mode 100644
index 000000000..8a433a512
--- /dev/null
+++ b/arch/arm/mach-dove/mpp.c
@@ -0,0 +1,162 @@
+/*
+ * arch/arm/mach-dove/mpp.c
+ *
+ * MPP functions for Marvell Dove 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/gpio.h>
+#include <linux/io.h>
+#include <plat/mpp.h>
+#include <mach/dove.h>
+#include <plat/orion-gpio.h>
+#include "mpp.h"
+
+struct dove_mpp_grp {
+ int start;
+ int end;
+};
+
+/* Map a group to a range of GPIO pins in that group */
+static const struct dove_mpp_grp dove_mpp_grp[] = {
+ [MPP_24_39] = {
+ .start = 24,
+ .end = 39,
+ },
+ [MPP_40_45] = {
+ .start = 40,
+ .end = 45,
+ },
+ [MPP_46_51] = {
+ .start = 46,
+ .end = 51,
+ },
+ [MPP_58_61] = {
+ .start = 58,
+ .end = 61,
+ },
+ [MPP_62_63] = {
+ .start = 62,
+ .end = 63,
+ },
+};
+
+/* Enable gpio for a range of pins. mode should be a combination of
+ GPIO_OUTPUT_OK | GPIO_INPUT_OK */
+static void __init dove_mpp_gpio_mode(int start, int end, int gpio_mode)
+{
+ int i;
+
+ for (i = start; i <= end; i++)
+ orion_gpio_set_valid(i, gpio_mode);
+}
+
+/* Dump all the extra MPP registers. The platform code will dump the
+ registers for pins 0-23. */
+static void __init dove_mpp_dump_regs(void)
+{
+ pr_debug("PMU_CTRL4_CTRL: %08x\n",
+ readl(DOVE_MPP_CTRL4_VIRT_BASE));
+
+ pr_debug("PMU_MPP_GENERAL_CTRL: %08x\n",
+ readl(DOVE_PMU_MPP_GENERAL_CTRL));
+
+ pr_debug("MPP_GENERAL: %08x\n", readl(DOVE_MPP_GENERAL_VIRT_BASE));
+}
+
+static void __init dove_mpp_cfg_nfc(int sel)
+{
+ u32 mpp_gen_cfg = readl(DOVE_MPP_GENERAL_VIRT_BASE);
+
+ mpp_gen_cfg &= ~0x1;
+ mpp_gen_cfg |= sel;
+ writel(mpp_gen_cfg, DOVE_MPP_GENERAL_VIRT_BASE);
+
+ dove_mpp_gpio_mode(64, 71, GPIO_OUTPUT_OK);
+}
+
+static void __init dove_mpp_cfg_au1(int sel)
+{
+ u32 mpp_ctrl4 = readl(DOVE_MPP_CTRL4_VIRT_BASE);
+ u32 ssp_ctrl1 = readl(DOVE_SSP_CTRL_STATUS_1);
+ u32 mpp_gen_ctrl = readl(DOVE_MPP_GENERAL_VIRT_BASE);
+ u32 global_cfg_2 = readl(DOVE_GLOBAL_CONFIG_2);
+
+ mpp_ctrl4 &= ~(DOVE_AU1_GPIO_SEL);
+ ssp_ctrl1 &= ~(DOVE_SSP_ON_AU1);
+ mpp_gen_ctrl &= ~(DOVE_AU1_SPDIFO_GPIO_EN);
+ global_cfg_2 &= ~(DOVE_TWSI_OPTION3_GPIO);
+
+ if (!sel || sel == 0x2)
+ dove_mpp_gpio_mode(52, 57, 0);
+ else
+ dove_mpp_gpio_mode(52, 57, GPIO_OUTPUT_OK | GPIO_INPUT_OK);
+
+ if (sel & 0x1) {
+ global_cfg_2 |= DOVE_TWSI_OPTION3_GPIO;
+ dove_mpp_gpio_mode(56, 57, 0);
+ }
+ if (sel & 0x2) {
+ mpp_gen_ctrl |= DOVE_AU1_SPDIFO_GPIO_EN;
+ dove_mpp_gpio_mode(57, 57, GPIO_OUTPUT_OK | GPIO_INPUT_OK);
+ }
+ if (sel & 0x4) {
+ ssp_ctrl1 |= DOVE_SSP_ON_AU1;
+ dove_mpp_gpio_mode(52, 55, 0);
+ }
+ if (sel & 0x8)
+ mpp_ctrl4 |= DOVE_AU1_GPIO_SEL;
+
+ writel(mpp_ctrl4, DOVE_MPP_CTRL4_VIRT_BASE);
+ writel(ssp_ctrl1, DOVE_SSP_CTRL_STATUS_1);
+ writel(mpp_gen_ctrl, DOVE_MPP_GENERAL_VIRT_BASE);
+ writel(global_cfg_2, DOVE_GLOBAL_CONFIG_2);
+}
+
+/* Configure the group registers, enabling GPIO if sel indicates the
+ pin is to be used for GPIO */
+static void __init dove_mpp_conf_grp(unsigned int *mpp_grp_list)
+{
+ u32 mpp_ctrl4 = readl(DOVE_MPP_CTRL4_VIRT_BASE);
+ int gpio_mode;
+
+ for ( ; *mpp_grp_list; mpp_grp_list++) {
+ unsigned int num = MPP_NUM(*mpp_grp_list);
+ unsigned int sel = MPP_SEL(*mpp_grp_list);
+
+ if (num > MPP_GRP_MAX) {
+ pr_err("dove: invalid MPP GRP number (%u)\n", num);
+ continue;
+ }
+
+ mpp_ctrl4 &= ~(0x1 << num);
+ mpp_ctrl4 |= sel << num;
+
+ gpio_mode = sel ? GPIO_OUTPUT_OK | GPIO_INPUT_OK : 0;
+ dove_mpp_gpio_mode(dove_mpp_grp[num].start,
+ dove_mpp_grp[num].end, gpio_mode);
+ }
+ writel(mpp_ctrl4, DOVE_MPP_CTRL4_VIRT_BASE);
+}
+
+/* Configure the various MPP pins on Dove */
+void __init dove_mpp_conf(unsigned int *mpp_list,
+ unsigned int *mpp_grp_list,
+ unsigned int grp_au1_52_57,
+ unsigned int grp_nfc_64_71)
+{
+ dove_mpp_dump_regs();
+
+ /* Use platform code for pins 0-23 */
+ orion_mpp_conf(mpp_list, 0, MPP_MAX, DOVE_MPP_VIRT_BASE);
+
+ dove_mpp_conf_grp(mpp_grp_list);
+ dove_mpp_cfg_au1(grp_au1_52_57);
+ dove_mpp_cfg_nfc(grp_nfc_64_71);
+
+ dove_mpp_dump_regs();
+}