marvell: drivers: Add address decoding units drivers

Add address decoding unit drivers for Marvell SoCs.

Address decoding flow and address translation units chart
are located at docs/marvell/misc/mvebu-a8k-addr-map.txt

Change-Id: Id6ce311fa1f4f112df3adfac5d20449f495f71ed
Signed-off-by: Hanna Hawa <hannah@marvell.com>
Signed-off-by: Konstantin Porotchkin <kostap@marvell.com>

1 files changed, 227 insertions, 0 deletions

diff --git a/drivers/marvell/gwin.c b/drivers/marvell/gwin.c
new file mode 100644
index 00000000..2b17f35c
--- /dev/null
+++ b/drivers/marvell/gwin.c
@@ -0,0 +1,227 @@
+/*
+ * Copyright (C) 2018 Marvell International Ltd.
+ *
+ * SPDX-License-Identifier:     BSD-3-Clause
+ * https://spdx.org/licenses
+ */
+
+/* GWIN unit device driver for Marvell AP810 SoC */
+
+#include <a8k_common.h>
+#include <debug.h>
+#include <gwin.h>
+#include <mmio.h>
+#include <mvebu.h>
+#include <mvebu_def.h>
+
+#if LOG_LEVEL >= LOG_LEVEL_INFO
+#define DEBUG_ADDR_MAP
+#endif
+
+/* common defines */
+#define WIN_ENABLE_BIT			(0x1)
+#define WIN_TARGET_MASK			(0xF)
+#define WIN_TARGET_SHIFT		(0x8)
+#define WIN_TARGET(tgt)			(((tgt) & WIN_TARGET_MASK) \
+					<< WIN_TARGET_SHIFT)
+
+/* Bits[43:26] of the physical address are the window base,
+ * which is aligned to 64MB
+ */
+#define ADDRESS_RSHIFT			(26)
+#define ADDRESS_LSHIFT			(10)
+#define GWIN_ALIGNMENT_64M		(0x4000000)
+
+/* AP registers */
+#define GWIN_CR_OFFSET(ap, win)		(MVEBU_GWIN_BASE(ap) + 0x0 + \
+						(0x10 * (win)))
+#define GWIN_ALR_OFFSET(ap, win)	(MVEBU_GWIN_BASE(ap) + 0x8 + \
+						(0x10 * (win)))
+#define GWIN_AHR_OFFSET(ap, win)	(MVEBU_GWIN_BASE(ap) + 0xc + \
+						(0x10 * (win)))
+
+#define CCU_GRU_CR_OFFSET(ap)		(MVEBU_CCU_GRU_BASE(ap))
+#define CCR_GRU_CR_GWIN_MBYPASS		(1 << 1)
+
+static void gwin_check(struct addr_map_win *win)
+{
+	/* The base is always 64M aligned */
+	if (IS_NOT_ALIGN(win->base_addr, GWIN_ALIGNMENT_64M)) {
+		win->base_addr &= ~(GWIN_ALIGNMENT_64M - 1);
+		NOTICE("%s: Align the base address to 0x%llx\n",
+		       __func__, win->base_addr);
+	}
+
+	/* size parameter validity check */
+	if (IS_NOT_ALIGN(win->win_size, GWIN_ALIGNMENT_64M)) {
+		win->win_size = ALIGN_UP(win->win_size, GWIN_ALIGNMENT_64M);
+		NOTICE("%s: Aligning window size to 0x%llx\n",
+		       __func__, win->win_size);
+	}
+}
+
+static void gwin_enable_window(int ap_index, struct addr_map_win *win,
+			       uint32_t win_num)
+{
+	uint32_t alr, ahr;
+	uint64_t end_addr;
+
+	if ((win->target_id & WIN_TARGET_MASK) != win->target_id) {
+		ERROR("target ID = %d, is invalid\n", win->target_id);
+		return;
+	}
+
+	/* calculate 64bit end-address */
+	end_addr = (win->base_addr + win->win_size - 1);
+
+	alr = (uint32_t)((win->base_addr >> ADDRESS_RSHIFT) << ADDRESS_LSHIFT);
+	ahr = (uint32_t)((end_addr >> ADDRESS_RSHIFT) << ADDRESS_LSHIFT);
+
+	/* write start address and end address for GWIN */
+	mmio_write_32(GWIN_ALR_OFFSET(ap_index, win_num), alr);
+	mmio_write_32(GWIN_AHR_OFFSET(ap_index, win_num), ahr);
+
+	/* write the target ID and enable the window */
+	mmio_write_32(GWIN_CR_OFFSET(ap_index, win_num),
+		      WIN_TARGET(win->target_id) | WIN_ENABLE_BIT);
+}
+
+static void gwin_disable_window(int ap_index, uint32_t win_num)
+{
+	uint32_t win_reg;
+
+	win_reg = mmio_read_32(GWIN_CR_OFFSET(ap_index, win_num));
+	win_reg &= ~WIN_ENABLE_BIT;
+	mmio_write_32(GWIN_CR_OFFSET(ap_index, win_num), win_reg);
+}
+
+/* Insert/Remove temporary window for using the out-of reset default
+ * CPx base address to access the CP configuration space prior to
+ * the further base address update in accordance with address mapping
+ * design.
+ *
+ * NOTE: Use the same window array for insertion and removal of
+ *       temporary windows.
+ */
+void gwin_temp_win_insert(int ap_index, struct addr_map_win *win, int size)
+{
+	uint32_t win_id;
+
+	for (int i = 0; i < size; i++) {
+		win_id = MVEBU_GWIN_MAX_WINS - i - 1;
+		gwin_check(win);
+		gwin_enable_window(ap_index, win, win_id);
+		win++;
+	}
+}
+
+/*
+ * NOTE: Use the same window array for insertion and removal of
+ *       temporary windows.
+ */
+void gwin_temp_win_remove(int ap_index, struct addr_map_win *win, int size)
+{
+	uint32_t win_id;
+
+	for (int i = 0; i < size; i++) {
+		uint64_t base;
+		uint32_t target;
+
+		win_id = MVEBU_GWIN_MAX_WINS - i - 1;
+
+		target = mmio_read_32(GWIN_CR_OFFSET(ap_index, win_id));
+		target >>= WIN_TARGET_SHIFT;
+		target &= WIN_TARGET_MASK;
+
+		base = mmio_read_32(GWIN_ALR_OFFSET(ap_index, win_id));
+		base >>= ADDRESS_LSHIFT;
+		base <<= ADDRESS_RSHIFT;
+
+		if (win->target_id != target) {
+			ERROR("%s: Trying to remove bad window-%d!\n",
+			      __func__, win_id);
+			continue;
+		}
+		gwin_disable_window(ap_index, win_id);
+		win++;
+	}
+}
+
+#ifdef DEBUG_ADDR_MAP
+static void dump_gwin(int ap_index)
+{
+	uint32_t win_num;
+
+	/* Dump all GWIN windows */
+	tf_printf("\tbank  target     start              end\n");
+	tf_printf("\t----------------------------------------------------\n");
+	for (win_num = 0; win_num < MVEBU_GWIN_MAX_WINS; win_num++) {
+		uint32_t cr;
+		uint64_t alr, ahr;
+
+		cr  = mmio_read_32(GWIN_CR_OFFSET(ap_index, win_num));
+		/* Window enabled */
+		if (cr & WIN_ENABLE_BIT) {
+			alr = mmio_read_32(GWIN_ALR_OFFSET(ap_index, win_num));
+			alr = (alr >> ADDRESS_LSHIFT) << ADDRESS_RSHIFT;
+			ahr = mmio_read_32(GWIN_AHR_OFFSET(ap_index, win_num));
+			ahr = (ahr >> ADDRESS_LSHIFT) << ADDRESS_RSHIFT;
+			tf_printf("\tgwin   %d     0x%016llx 0x%016llx\n",
+				  (cr >> 8) & 0xF, alr, ahr);
+		}
+	}
+}
+#endif
+
+int init_gwin(int ap_index)
+{
+	struct addr_map_win *win;
+	uint32_t win_id;
+	uint32_t win_count;
+	uint32_t win_reg;
+
+	INFO("Initializing GWIN Address decoding\n");
+
+	/* Get the array of the windows and its size */
+	marvell_get_gwin_memory_map(ap_index, &win, &win_count);
+	if (win_count <= 0) {
+		INFO("no windows configurations found\n");
+		return 0;
+	}
+
+	if (win_count > MVEBU_GWIN_MAX_WINS) {
+		ERROR("number of windows is bigger than %d\n",
+		      MVEBU_GWIN_MAX_WINS);
+		return 0;
+	}
+
+	/* disable all windows */
+	for (win_id = 0; win_id < MVEBU_GWIN_MAX_WINS; win_id++)
+		gwin_disable_window(ap_index, win_id);
+
+	/* enable relevant windows */
+	for (win_id = 0; win_id < win_count; win_id++, win++) {
+		gwin_check(win);
+		gwin_enable_window(ap_index, win, win_id);
+	}
+
+	/* GWIN Miss feature has not verified, therefore any access towards
+	 * remote AP should be accompanied with proper configuration to
+	 * GWIN registers group and therefore the GWIN Miss feature
+	 * should be set into Bypass mode, need to make sure all GWIN regions
+	 * are defined correctly that will assure no GWIN miss occurrance
+	 * JIRA-AURORA2-1630
+	 */
+	INFO("Update GWIN miss bypass\n");
+	win_reg = mmio_read_32(CCU_GRU_CR_OFFSET(ap_index));
+	win_reg |= CCR_GRU_CR_GWIN_MBYPASS;
+	mmio_write_32(CCU_GRU_CR_OFFSET(ap_index), win_reg);
+
+#ifdef DEBUG_ADDR_MAP
+	dump_gwin(ap_index);
+#endif
+
+	INFO("Done GWIN Address decoding Initializing\n");
+
+	return 0;
+}