GK SDK 源码库: XMIPCLinuxV100R005C00SPC030 (kernel/tools/open_source excluded)

source/trusted-firmware/trusted-firmware-a-2.8/drivers/arm/cci/cci.c

@@ -0,0 +1,186 @@
+/*
+ * Copyright (c) 2015-2020, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <assert.h>
+#include <stdbool.h>
+#include <stdint.h>
+
+#include <arch.h>
+#include <arch_helpers.h>
+#include <common/debug.h>
+#include <drivers/arm/cci.h>
+#include <lib/mmio.h>
+
+#define MAKE_CCI_PART_NUMBER(hi, lo)	(((hi) << 8) | (lo))
+#define CCI_PART_LO_MASK		U(0xff)
+#define CCI_PART_HI_MASK		U(0xf)
+
+/* CCI part number codes read from Peripheral ID registers 0 and 1 */
+#define CCI400_PART_NUM		0x420
+#define CCI500_PART_NUM		0x422
+#define CCI550_PART_NUM		0x423
+
+#define CCI400_SLAVE_PORTS	5
+#define CCI500_SLAVE_PORTS	7
+#define CCI550_SLAVE_PORTS	7
+
+static uintptr_t cci_base;
+static const int *cci_slave_if_map;
+
+#if ENABLE_ASSERTIONS
+static unsigned int max_master_id;
+static int cci_num_slave_ports;
+
+static bool validate_cci_map(const int *map)
+{
+	unsigned int valid_cci_map = 0U;
+	int slave_if_id;
+	unsigned int i;
+
+	/* Validate the map */
+	for (i = 0U; i <= max_master_id; i++) {
+		slave_if_id = map[i];
+
+		if (slave_if_id < 0)
+			continue;
+
+		if (slave_if_id >= cci_num_slave_ports) {
+			ERROR("Slave interface ID is invalid\n");
+			return false;
+		}
+
+		if ((valid_cci_map & (1UL << slave_if_id)) != 0U) {
+			ERROR("Multiple masters are assigned same slave interface ID\n");
+			return false;
+		}
+		valid_cci_map |= 1UL << slave_if_id;
+	}
+
+	if (valid_cci_map == 0U) {
+		ERROR("No master is assigned a valid slave interface\n");
+		return false;
+	}
+
+	return true;
+}
+
+/*
+ * Read CCI part number from Peripheral ID registers
+ */
+static unsigned int read_cci_part_number(uintptr_t base)
+{
+	unsigned int part_lo, part_hi;
+
+	part_lo = mmio_read_32(base + PERIPHERAL_ID0) & CCI_PART_LO_MASK;
+	part_hi = mmio_read_32(base + PERIPHERAL_ID1) & CCI_PART_HI_MASK;
+
+	return MAKE_CCI_PART_NUMBER(part_hi, part_lo);
+}
+
+/*
+ * Identify a CCI device, and return the number of slaves. Return -1 for an
+ * unidentified device.
+ */
+static int get_slave_ports(unsigned int part_num)
+{
+	int num_slave_ports = -1;
+
+	switch (part_num) {
+
+	case CCI400_PART_NUM:
+		num_slave_ports = CCI400_SLAVE_PORTS;
+		break;
+	case CCI500_PART_NUM:
+		num_slave_ports = CCI500_SLAVE_PORTS;
+		break;
+	case CCI550_PART_NUM:
+		num_slave_ports = CCI550_SLAVE_PORTS;
+		break;
+	default:
+		/* Do nothing in default case */
+		break;
+	}
+
+	return num_slave_ports;
+}
+#endif /* ENABLE_ASSERTIONS */
+
+void __init cci_init(uintptr_t base, const int *map,
+				unsigned int num_cci_masters)
+{
+	assert(map != NULL);
+	assert(base != 0U);
+
+	cci_base = base;
+	cci_slave_if_map = map;
+
+#if ENABLE_ASSERTIONS
+	/*
+	 * Master Id's are assigned from zero, So in an array of size n
+	 * the max master id is (n - 1).
+	 */
+	max_master_id = num_cci_masters - 1U;
+	cci_num_slave_ports = get_slave_ports(read_cci_part_number(base));
+#endif
+	assert(cci_num_slave_ports >= 0);
+
+	assert(validate_cci_map(map));
+}
+
+void cci_enable_snoop_dvm_reqs(unsigned int master_id)
+{
+	int slave_if_id = cci_slave_if_map[master_id];
+
+	assert(master_id <= max_master_id);
+	assert((slave_if_id < cci_num_slave_ports) && (slave_if_id >= 0));
+	assert(cci_base != 0U);
+
+	/*
+	 * Enable Snoops and DVM messages, no need for Read/Modify/Write as
+	 * rest of bits are write ignore
+	 */
+	mmio_write_32(cci_base +
+		      SLAVE_IFACE_OFFSET(slave_if_id) + SNOOP_CTRL_REG,
+		      DVM_EN_BIT | SNOOP_EN_BIT);
+
+	/*
+	 * Wait for the completion of the write to the Snoop Control Register
+	 * before testing the change_pending bit
+	 */
+	dsbish();
+
+	/* Wait for the dust to settle down */
+	while ((mmio_read_32(cci_base + STATUS_REG) & CHANGE_PENDING_BIT) != 0U)
+		;
+}
+
+void cci_disable_snoop_dvm_reqs(unsigned int master_id)
+{
+	int slave_if_id = cci_slave_if_map[master_id];
+
+	assert(master_id <= max_master_id);
+	assert((slave_if_id < cci_num_slave_ports) && (slave_if_id >= 0));
+	assert(cci_base != 0U);
+
+	/*
+	 * Disable Snoops and DVM messages, no need for Read/Modify/Write as
+	 * rest of bits are write ignore.
+	 */
+	mmio_write_32(cci_base +
+		      SLAVE_IFACE_OFFSET(slave_if_id) + SNOOP_CTRL_REG,
+		      ~(DVM_EN_BIT | SNOOP_EN_BIT));
+
+	/*
+	 * Wait for the completion of the write to the Snoop Control Register
+	 * before testing the change_pending bit
+	 */
+	dsbish();
+
+	/* Wait for the dust to settle down */
+	while ((mmio_read_32(cci_base + STATUS_REG) & CHANGE_PENDING_BIT) != 0U)
+		;
+}
+