diff options
Diffstat (limited to 'drivers/arm/cci/cci.c')
| -rw-r--r-- | drivers/arm/cci/cci.c | 167 |
1 files changed, 167 insertions, 0 deletions
diff --git a/drivers/arm/cci/cci.c b/drivers/arm/cci/cci.c new file mode 100644 index 00000000..e1568384 --- /dev/null +++ b/drivers/arm/cci/cci.c @@ -0,0 +1,167 @@ +/* + * Copyright (c) 2015-2017, ARM Limited and Contributors. All rights reserved. + * + * SPDX-License-Identifier: BSD-3-Clause + */ + +#include <arch.h> +#include <assert.h> +#include <cci.h> +#include <debug.h> +#include <mmio.h> +#include <stdint.h> + +#define MAKE_CCI_PART_NUMBER(hi, lo) ((hi << 8) | lo) +#define CCI_PART_LO_MASK 0xff +#define CCI_PART_HI_MASK 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 int validate_cci_map(const int *map) +{ + unsigned int valid_cci_map = 0; + int slave_if_id; + int i; + + /* Validate the map */ + for (i = 0; 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 0; + } + + if (valid_cci_map & (1 << slave_if_id)) { + ERROR("Multiple masters are assigned same slave interface ID\n"); + return 0; + } + valid_cci_map |= 1 << slave_if_id; + } + + if (!valid_cci_map) { + ERROR("No master is assigned a valid slave interface\n"); + return 0; + } + + return 1; +} + +/* + * 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) +{ + /* Macro to match CCI products */ +#define RET_ON_MATCH(product) \ + case CCI ## product ## _PART_NUM: \ + return CCI ## product ## _SLAVE_PORTS + + switch (part_num) { + + RET_ON_MATCH(400); + RET_ON_MATCH(500); + RET_ON_MATCH(550); + + default: + return -1; + } + +#undef RET_ON_MATCH +} +#endif /* ENABLE_ASSERTIONS */ + +void cci_init(uintptr_t base, const int *map, unsigned int num_cci_masters) +{ + assert(map); + assert(base); + + 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 - 1; + 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); + + /* + * 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 dust to settle down */ + while (mmio_read_32(cci_base + STATUS_REG) & CHANGE_PENDING_BIT) + ; +} + +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); + + /* + * 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 dust to settle down */ + while (mmio_read_32(cci_base + STATUS_REG) & CHANGE_PENDING_BIT) + ; +} + |