| /* |
| * QEMU PowerPC PowerNV Processor I2C model |
| * |
| * Copyright (c) 2019-2023, IBM Corporation. |
| * |
| * SPDX-License-Identifier: GPL-2.0-or-later |
| */ |
| |
| #include "qemu/osdep.h" |
| #include "qemu/module.h" |
| #include "qemu/log.h" |
| #include "sysemu/reset.h" |
| |
| #include "hw/irq.h" |
| #include "hw/qdev-properties.h" |
| |
| #include "hw/ppc/pnv.h" |
| #include "hw/ppc/pnv_chip.h" |
| #include "hw/ppc/pnv_i2c.h" |
| #include "hw/ppc/pnv_xscom.h" |
| #include "hw/ppc/fdt.h" |
| |
| #include <libfdt.h> |
| |
| /* I2C FIFO register */ |
| #define I2C_FIFO_REG 0x4 |
| #define I2C_FIFO PPC_BITMASK(0, 7) |
| |
| /* I2C command register */ |
| #define I2C_CMD_REG 0x5 |
| #define I2C_CMD_WITH_START PPC_BIT(0) |
| #define I2C_CMD_WITH_ADDR PPC_BIT(1) |
| #define I2C_CMD_READ_CONT PPC_BIT(2) |
| #define I2C_CMD_WITH_STOP PPC_BIT(3) |
| #define I2C_CMD_INTR_STEERING PPC_BITMASK(6, 7) /* P9 */ |
| #define I2C_CMD_INTR_STEER_HOST 1 |
| #define I2C_CMD_INTR_STEER_OCC 2 |
| #define I2C_CMD_DEV_ADDR PPC_BITMASK(8, 14) |
| #define I2C_CMD_READ_NOT_WRITE PPC_BIT(15) |
| #define I2C_CMD_LEN_BYTES PPC_BITMASK(16, 31) |
| #define I2C_MAX_TFR_LEN 0xfff0ull |
| |
| /* I2C mode register */ |
| #define I2C_MODE_REG 0x6 |
| #define I2C_MODE_BIT_RATE_DIV PPC_BITMASK(0, 15) |
| #define I2C_MODE_PORT_NUM PPC_BITMASK(16, 21) |
| #define I2C_MODE_ENHANCED PPC_BIT(28) |
| #define I2C_MODE_DIAGNOSTIC PPC_BIT(29) |
| #define I2C_MODE_PACING_ALLOW PPC_BIT(30) |
| #define I2C_MODE_WRAP PPC_BIT(31) |
| |
| /* I2C watermark register */ |
| #define I2C_WATERMARK_REG 0x7 |
| #define I2C_WATERMARK_HIGH PPC_BITMASK(16, 19) |
| #define I2C_WATERMARK_LOW PPC_BITMASK(24, 27) |
| |
| /* |
| * I2C interrupt mask and condition registers |
| * |
| * NB: The function of 0x9 and 0xa changes depending on whether you're reading |
| * or writing to them. When read they return the interrupt condition bits |
| * and on writes they update the interrupt mask register. |
| * |
| * The bit definitions are the same for all the interrupt registers. |
| */ |
| #define I2C_INTR_MASK_REG 0x8 |
| |
| #define I2C_INTR_RAW_COND_REG 0x9 /* read */ |
| #define I2C_INTR_MASK_OR_REG 0x9 /* write*/ |
| |
| #define I2C_INTR_COND_REG 0xa /* read */ |
| #define I2C_INTR_MASK_AND_REG 0xa /* write */ |
| |
| #define I2C_INTR_ALL PPC_BITMASK(16, 31) |
| #define I2C_INTR_INVALID_CMD PPC_BIT(16) |
| #define I2C_INTR_LBUS_PARITY_ERR PPC_BIT(17) |
| #define I2C_INTR_BKEND_OVERRUN_ERR PPC_BIT(18) |
| #define I2C_INTR_BKEND_ACCESS_ERR PPC_BIT(19) |
| #define I2C_INTR_ARBT_LOST_ERR PPC_BIT(20) |
| #define I2C_INTR_NACK_RCVD_ERR PPC_BIT(21) |
| #define I2C_INTR_DATA_REQ PPC_BIT(22) |
| #define I2C_INTR_CMD_COMP PPC_BIT(23) |
| #define I2C_INTR_STOP_ERR PPC_BIT(24) |
| #define I2C_INTR_I2C_BUSY PPC_BIT(25) |
| #define I2C_INTR_NOT_I2C_BUSY PPC_BIT(26) |
| #define I2C_INTR_SCL_EQ_1 PPC_BIT(28) |
| #define I2C_INTR_SCL_EQ_0 PPC_BIT(29) |
| #define I2C_INTR_SDA_EQ_1 PPC_BIT(30) |
| #define I2C_INTR_SDA_EQ_0 PPC_BIT(31) |
| |
| /* I2C status register */ |
| #define I2C_RESET_I2C_REG 0xb /* write */ |
| #define I2C_RESET_ERRORS 0xc |
| #define I2C_STAT_REG 0xb /* read */ |
| #define I2C_STAT_INVALID_CMD PPC_BIT(0) |
| #define I2C_STAT_LBUS_PARITY_ERR PPC_BIT(1) |
| #define I2C_STAT_BKEND_OVERRUN_ERR PPC_BIT(2) |
| #define I2C_STAT_BKEND_ACCESS_ERR PPC_BIT(3) |
| #define I2C_STAT_ARBT_LOST_ERR PPC_BIT(4) |
| #define I2C_STAT_NACK_RCVD_ERR PPC_BIT(5) |
| #define I2C_STAT_DATA_REQ PPC_BIT(6) |
| #define I2C_STAT_CMD_COMP PPC_BIT(7) |
| #define I2C_STAT_STOP_ERR PPC_BIT(8) |
| #define I2C_STAT_UPPER_THRS PPC_BITMASK(9, 15) |
| #define I2C_STAT_ANY_I2C_INTR PPC_BIT(16) |
| #define I2C_STAT_PORT_HISTORY_BUSY PPC_BIT(19) |
| #define I2C_STAT_SCL_INPUT_LEVEL PPC_BIT(20) |
| #define I2C_STAT_SDA_INPUT_LEVEL PPC_BIT(21) |
| #define I2C_STAT_PORT_BUSY PPC_BIT(22) |
| #define I2C_STAT_INTERFACE_BUSY PPC_BIT(23) |
| #define I2C_STAT_FIFO_ENTRY_COUNT PPC_BITMASK(24, 31) |
| |
| #define I2C_STAT_ANY_ERR (I2C_STAT_INVALID_CMD | I2C_STAT_LBUS_PARITY_ERR | \ |
| I2C_STAT_BKEND_OVERRUN_ERR | \ |
| I2C_STAT_BKEND_ACCESS_ERR | I2C_STAT_ARBT_LOST_ERR | \ |
| I2C_STAT_NACK_RCVD_ERR | I2C_STAT_STOP_ERR) |
| |
| |
| #define I2C_INTR_ACTIVE \ |
| ((I2C_STAT_ANY_ERR >> 16) | I2C_INTR_CMD_COMP | I2C_INTR_DATA_REQ) |
| |
| /* Pseudo-status used for timeouts */ |
| #define I2C_STAT_PSEUDO_TIMEOUT PPC_BIT(63) |
| |
| /* I2C extended status register */ |
| #define I2C_EXTD_STAT_REG 0xc |
| #define I2C_EXTD_STAT_FIFO_SIZE PPC_BITMASK(0, 7) |
| #define I2C_EXTD_STAT_MSM_CURSTATE PPC_BITMASK(11, 15) |
| #define I2C_EXTD_STAT_SCL_IN_SYNC PPC_BIT(16) |
| #define I2C_EXTD_STAT_SDA_IN_SYNC PPC_BIT(17) |
| #define I2C_EXTD_STAT_S_SCL PPC_BIT(18) |
| #define I2C_EXTD_STAT_S_SDA PPC_BIT(19) |
| #define I2C_EXTD_STAT_M_SCL PPC_BIT(20) |
| #define I2C_EXTD_STAT_M_SDA PPC_BIT(21) |
| #define I2C_EXTD_STAT_HIGH_WATER PPC_BIT(22) |
| #define I2C_EXTD_STAT_LOW_WATER PPC_BIT(23) |
| #define I2C_EXTD_STAT_I2C_BUSY PPC_BIT(24) |
| #define I2C_EXTD_STAT_SELF_BUSY PPC_BIT(25) |
| #define I2C_EXTD_STAT_I2C_VERSION PPC_BITMASK(27, 31) |
| |
| /* I2C residual front end/back end length */ |
| #define I2C_RESIDUAL_LEN_REG 0xd |
| #define I2C_RESIDUAL_FRONT_END PPC_BITMASK(0, 15) |
| #define I2C_RESIDUAL_BACK_END PPC_BITMASK(16, 31) |
| |
| /* Port busy register */ |
| #define I2C_PORT_BUSY_REG 0xe |
| #define I2C_SET_S_SCL_REG 0xd |
| #define I2C_RESET_S_SCL_REG 0xf |
| #define I2C_SET_S_SDA_REG 0x10 |
| #define I2C_RESET_S_SDA_REG 0x11 |
| |
| #define PNV_I2C_FIFO_SIZE 8 |
| |
| static I2CBus *pnv_i2c_get_bus(PnvI2C *i2c) |
| { |
| uint8_t port = GETFIELD(I2C_MODE_PORT_NUM, i2c->regs[I2C_MODE_REG]); |
| |
| if (port >= i2c->num_busses) { |
| qemu_log_mask(LOG_GUEST_ERROR, "I2C: invalid bus number %d/%d\n", port, |
| i2c->num_busses); |
| return NULL; |
| } |
| return i2c->busses[port]; |
| } |
| |
| static void pnv_i2c_update_irq(PnvI2C *i2c) |
| { |
| I2CBus *bus = pnv_i2c_get_bus(i2c); |
| bool recv = !!(i2c->regs[I2C_CMD_REG] & I2C_CMD_READ_NOT_WRITE); |
| uint16_t front_end = GETFIELD(I2C_RESIDUAL_FRONT_END, |
| i2c->regs[I2C_RESIDUAL_LEN_REG]); |
| uint16_t back_end = GETFIELD(I2C_RESIDUAL_BACK_END, |
| i2c->regs[I2C_RESIDUAL_LEN_REG]); |
| uint8_t fifo_count = GETFIELD(I2C_STAT_FIFO_ENTRY_COUNT, |
| i2c->regs[I2C_STAT_REG]); |
| uint8_t fifo_free = PNV_I2C_FIFO_SIZE - fifo_count; |
| |
| if (!bus) { |
| qemu_log_mask(LOG_GUEST_ERROR, "I2C: invalid port\n"); |
| return; |
| } |
| |
| if (i2c_bus_busy(bus)) { |
| i2c->regs[I2C_STAT_REG] &= ~I2C_STAT_DATA_REQ; |
| |
| if (recv) { |
| if (fifo_count >= |
| GETFIELD(I2C_WATERMARK_HIGH, i2c->regs[I2C_WATERMARK_REG])) { |
| i2c->regs[I2C_EXTD_STAT_REG] |= I2C_EXTD_STAT_HIGH_WATER; |
| } else { |
| i2c->regs[I2C_EXTD_STAT_REG] &= ~I2C_EXTD_STAT_HIGH_WATER; |
| } |
| |
| if (((i2c->regs[I2C_EXTD_STAT_REG] & I2C_EXTD_STAT_HIGH_WATER) && |
| fifo_count != 0) || front_end == 0) { |
| i2c->regs[I2C_STAT_REG] |= I2C_STAT_DATA_REQ; |
| } |
| } else { |
| if (fifo_count <= |
| GETFIELD(I2C_WATERMARK_LOW, i2c->regs[I2C_WATERMARK_REG])) { |
| i2c->regs[I2C_EXTD_STAT_REG] |= I2C_EXTD_STAT_LOW_WATER; |
| } else { |
| i2c->regs[I2C_EXTD_STAT_REG] &= ~I2C_EXTD_STAT_LOW_WATER; |
| } |
| |
| if (back_end > 0 && |
| (fifo_free >= back_end || |
| (i2c->regs[I2C_EXTD_STAT_REG] & I2C_EXTD_STAT_LOW_WATER))) { |
| i2c->regs[I2C_STAT_REG] |= I2C_STAT_DATA_REQ; |
| } |
| } |
| |
| if (back_end == 0 && front_end == 0) { |
| i2c->regs[I2C_STAT_REG] &= ~I2C_STAT_DATA_REQ; |
| i2c->regs[I2C_STAT_REG] |= I2C_STAT_CMD_COMP; |
| |
| if (i2c->regs[I2C_CMD_REG] & I2C_CMD_WITH_STOP) { |
| i2c_end_transfer(bus); |
| i2c->regs[I2C_EXTD_STAT_REG] &= |
| ~(I2C_EXTD_STAT_I2C_BUSY | I2C_EXTD_STAT_SELF_BUSY); |
| } |
| } else { |
| i2c->regs[I2C_STAT_REG] &= ~I2C_STAT_CMD_COMP; |
| } |
| } |
| |
| /* |
| * Status and interrupt registers have nearly the same layout. |
| */ |
| i2c->regs[I2C_INTR_RAW_COND_REG] = i2c->regs[I2C_STAT_REG] >> 16; |
| i2c->regs[I2C_INTR_COND_REG] = |
| i2c->regs[I2C_INTR_RAW_COND_REG] & i2c->regs[I2C_INTR_MASK_REG]; |
| |
| qemu_set_irq(i2c->psi_irq, i2c->regs[I2C_INTR_COND_REG] != 0); |
| } |
| |
| static void pnv_i2c_fifo_update_count(PnvI2C *i2c) |
| { |
| uint64_t stat = i2c->regs[I2C_STAT_REG]; |
| |
| i2c->regs[I2C_STAT_REG] = SETFIELD(I2C_STAT_FIFO_ENTRY_COUNT, stat, |
| fifo8_num_used(&i2c->fifo)); |
| } |
| |
| static void pnv_i2c_frontend_update(PnvI2C *i2c) |
| { |
| uint64_t residual_end = i2c->regs[I2C_RESIDUAL_LEN_REG]; |
| uint16_t front_end = GETFIELD(I2C_RESIDUAL_FRONT_END, residual_end); |
| |
| i2c->regs[I2C_RESIDUAL_LEN_REG] = |
| SETFIELD(I2C_RESIDUAL_FRONT_END, residual_end, front_end - 1); |
| } |
| |
| static void pnv_i2c_fifo_flush(PnvI2C *i2c) |
| { |
| I2CBus *bus = pnv_i2c_get_bus(i2c); |
| uint8_t data; |
| int ret; |
| |
| if (!bus) { |
| qemu_log_mask(LOG_GUEST_ERROR, "I2C: invalid port\n"); |
| return; |
| } |
| if (!i2c_bus_busy(bus)) { |
| return; |
| } |
| |
| if (i2c->regs[I2C_CMD_REG] & I2C_CMD_READ_NOT_WRITE) { |
| if (fifo8_is_full(&i2c->fifo)) { |
| return; |
| } |
| |
| data = i2c_recv(bus); |
| fifo8_push(&i2c->fifo, data); |
| } else { |
| if (fifo8_is_empty(&i2c->fifo)) { |
| return; |
| } |
| |
| data = fifo8_pop(&i2c->fifo); |
| ret = i2c_send(bus, data); |
| if (ret) { |
| i2c->regs[I2C_STAT_REG] |= I2C_STAT_NACK_RCVD_ERR; |
| i2c_end_transfer(bus); |
| } |
| } |
| |
| pnv_i2c_fifo_update_count(i2c); |
| pnv_i2c_frontend_update(i2c); |
| } |
| |
| static void pnv_i2c_handle_cmd(PnvI2C *i2c, uint64_t val) |
| { |
| I2CBus *bus = pnv_i2c_get_bus(i2c); |
| uint8_t addr = GETFIELD(I2C_CMD_DEV_ADDR, val); |
| int recv = !!(val & I2C_CMD_READ_NOT_WRITE); |
| uint32_t len_bytes = GETFIELD(I2C_CMD_LEN_BYTES, val); |
| |
| if (!(val & I2C_CMD_WITH_START) && !(val & I2C_CMD_WITH_ADDR) && |
| !(val & I2C_CMD_WITH_STOP) && !len_bytes) { |
| i2c->regs[I2C_STAT_REG] |= I2C_STAT_INVALID_CMD; |
| qemu_log_mask(LOG_GUEST_ERROR, "I2C: invalid command 0x%"PRIx64"\n", |
| val); |
| return; |
| } |
| |
| if (!(i2c->regs[I2C_STAT_REG] & I2C_STAT_CMD_COMP)) { |
| i2c->regs[I2C_STAT_REG] |= I2C_STAT_INVALID_CMD; |
| qemu_log_mask(LOG_GUEST_ERROR, "I2C: command in progress\n"); |
| return; |
| } |
| |
| if (!bus) { |
| qemu_log_mask(LOG_GUEST_ERROR, "I2C: invalid port\n"); |
| return; |
| } |
| |
| i2c->regs[I2C_RESIDUAL_LEN_REG] = |
| SETFIELD(I2C_RESIDUAL_FRONT_END, 0ull, len_bytes) | |
| SETFIELD(I2C_RESIDUAL_BACK_END, 0ull, len_bytes); |
| |
| if (val & I2C_CMD_WITH_START) { |
| if (i2c_start_transfer(bus, addr, recv)) { |
| i2c->regs[I2C_STAT_REG] |= I2C_STAT_NACK_RCVD_ERR; |
| } else { |
| i2c->regs[I2C_EXTD_STAT_REG] |= |
| (I2C_EXTD_STAT_I2C_BUSY | I2C_EXTD_STAT_SELF_BUSY); |
| pnv_i2c_fifo_flush(i2c); |
| } |
| } |
| } |
| |
| static void pnv_i2c_backend_update(PnvI2C *i2c) |
| { |
| uint64_t residual_end = i2c->regs[I2C_RESIDUAL_LEN_REG]; |
| uint16_t back_end = GETFIELD(I2C_RESIDUAL_BACK_END, residual_end); |
| |
| if (!back_end) { |
| i2c->regs[I2C_STAT_REG] |= I2C_STAT_BKEND_ACCESS_ERR; |
| return; |
| } |
| |
| i2c->regs[I2C_RESIDUAL_LEN_REG] = |
| SETFIELD(I2C_RESIDUAL_BACK_END, residual_end, back_end - 1); |
| } |
| |
| static void pnv_i2c_fifo_in(PnvI2C *i2c) |
| { |
| uint8_t data = GETFIELD(I2C_FIFO, i2c->regs[I2C_FIFO_REG]); |
| I2CBus *bus = pnv_i2c_get_bus(i2c); |
| |
| if (!bus) { |
| qemu_log_mask(LOG_GUEST_ERROR, "I2C: invalid port\n"); |
| return; |
| } |
| |
| if (!i2c_bus_busy(bus)) { |
| i2c->regs[I2C_STAT_REG] |= I2C_STAT_INVALID_CMD; |
| qemu_log_mask(LOG_GUEST_ERROR, "I2C: no command in progress\n"); |
| return; |
| } |
| |
| if (i2c->regs[I2C_CMD_REG] & I2C_CMD_READ_NOT_WRITE) { |
| i2c->regs[I2C_STAT_REG] |= I2C_STAT_INVALID_CMD; |
| qemu_log_mask(LOG_GUEST_ERROR, "I2C: read command in progress\n"); |
| return; |
| } |
| |
| if (fifo8_is_full(&i2c->fifo)) { |
| if (!(i2c->regs[I2C_MODE_REG] & I2C_MODE_PACING_ALLOW)) { |
| i2c->regs[I2C_STAT_REG] |= I2C_STAT_BKEND_OVERRUN_ERR; |
| } |
| return; |
| } |
| |
| fifo8_push(&i2c->fifo, data); |
| pnv_i2c_fifo_update_count(i2c); |
| pnv_i2c_backend_update(i2c); |
| pnv_i2c_fifo_flush(i2c); |
| } |
| |
| static void pnv_i2c_fifo_out(PnvI2C *i2c) |
| { |
| uint8_t data; |
| I2CBus *bus = pnv_i2c_get_bus(i2c); |
| |
| if (!bus) { |
| qemu_log_mask(LOG_GUEST_ERROR, "I2C: invalid port\n"); |
| return; |
| } |
| |
| if (!i2c_bus_busy(bus)) { |
| i2c->regs[I2C_STAT_REG] |= I2C_STAT_INVALID_CMD; |
| qemu_log_mask(LOG_GUEST_ERROR, "I2C: no command in progress\n"); |
| return; |
| } |
| |
| if (!(i2c->regs[I2C_CMD_REG] & I2C_CMD_READ_NOT_WRITE)) { |
| i2c->regs[I2C_STAT_REG] |= I2C_STAT_INVALID_CMD; |
| qemu_log_mask(LOG_GUEST_ERROR, "I2C: write command in progress\n"); |
| return; |
| } |
| |
| if (fifo8_is_empty(&i2c->fifo)) { |
| if (!(i2c->regs[I2C_MODE_REG] & I2C_MODE_PACING_ALLOW)) { |
| i2c->regs[I2C_STAT_REG] |= I2C_STAT_BKEND_OVERRUN_ERR; |
| } |
| return; |
| } |
| |
| data = fifo8_pop(&i2c->fifo); |
| |
| i2c->regs[I2C_FIFO_REG] = SETFIELD(I2C_FIFO, 0ull, data); |
| pnv_i2c_fifo_update_count(i2c); |
| pnv_i2c_backend_update(i2c); |
| } |
| |
| static uint64_t pnv_i2c_xscom_read(void *opaque, hwaddr addr, |
| unsigned size) |
| { |
| PnvI2C *i2c = PNV_I2C(opaque); |
| uint32_t offset = addr >> 3; |
| uint64_t val = -1; |
| int i; |
| |
| switch (offset) { |
| case I2C_STAT_REG: |
| val = i2c->regs[offset]; |
| break; |
| |
| case I2C_FIFO_REG: |
| pnv_i2c_fifo_out(i2c); |
| val = i2c->regs[offset]; |
| break; |
| |
| case I2C_PORT_BUSY_REG: /* compute busy bit for each port */ |
| val = 0; |
| for (i = 0; i < i2c->num_busses; i++) { |
| val |= i2c_bus_busy(i2c->busses[i]) << i; |
| } |
| break; |
| |
| case I2C_CMD_REG: |
| case I2C_MODE_REG: |
| case I2C_WATERMARK_REG: |
| case I2C_INTR_MASK_REG: |
| case I2C_INTR_RAW_COND_REG: |
| case I2C_INTR_COND_REG: |
| case I2C_EXTD_STAT_REG: |
| case I2C_RESIDUAL_LEN_REG: |
| val = i2c->regs[offset]; |
| break; |
| default: |
| i2c->regs[I2C_STAT_REG] |= I2C_STAT_INVALID_CMD; |
| qemu_log_mask(LOG_GUEST_ERROR, "I2C: read at register: 0x%" |
| HWADDR_PRIx "\n", addr >> 3); |
| } |
| |
| pnv_i2c_update_irq(i2c); |
| |
| return val; |
| } |
| |
| static void pnv_i2c_xscom_write(void *opaque, hwaddr addr, |
| uint64_t val, unsigned size) |
| { |
| PnvI2C *i2c = PNV_I2C(opaque); |
| uint32_t offset = addr >> 3; |
| |
| switch (offset) { |
| case I2C_MODE_REG: |
| { |
| i2c->regs[offset] = val; |
| I2CBus *bus = pnv_i2c_get_bus(i2c); |
| if (!bus) { |
| qemu_log_mask(LOG_GUEST_ERROR, "I2C: invalid port\n"); |
| return; |
| } |
| if (i2c_bus_busy(bus)) { |
| i2c->regs[I2C_STAT_REG] |= I2C_STAT_INVALID_CMD; |
| qemu_log_mask(LOG_GUEST_ERROR, "I2C: command in progress\n"); |
| } |
| } |
| break; |
| |
| case I2C_CMD_REG: |
| i2c->regs[offset] = val; |
| pnv_i2c_handle_cmd(i2c, val); |
| break; |
| |
| case I2C_FIFO_REG: |
| i2c->regs[offset] = val; |
| pnv_i2c_fifo_in(i2c); |
| break; |
| |
| case I2C_WATERMARK_REG: |
| i2c->regs[offset] = val; |
| break; |
| |
| case I2C_RESET_I2C_REG: |
| i2c->regs[I2C_MODE_REG] = 0; |
| i2c->regs[I2C_CMD_REG] = 0; |
| i2c->regs[I2C_WATERMARK_REG] = 0; |
| i2c->regs[I2C_INTR_MASK_REG] = 0; |
| i2c->regs[I2C_INTR_COND_REG] = 0; |
| i2c->regs[I2C_INTR_RAW_COND_REG] = 0; |
| i2c->regs[I2C_STAT_REG] = 0; |
| i2c->regs[I2C_RESIDUAL_LEN_REG] = 0; |
| i2c->regs[I2C_EXTD_STAT_REG] &= |
| (I2C_EXTD_STAT_FIFO_SIZE | I2C_EXTD_STAT_I2C_VERSION); |
| break; |
| |
| case I2C_RESET_ERRORS: |
| i2c->regs[I2C_STAT_REG] &= ~I2C_STAT_ANY_ERR; |
| i2c->regs[I2C_RESIDUAL_LEN_REG] = 0; |
| i2c->regs[I2C_EXTD_STAT_REG] &= |
| (I2C_EXTD_STAT_FIFO_SIZE | I2C_EXTD_STAT_I2C_VERSION); |
| fifo8_reset(&i2c->fifo); |
| break; |
| |
| case I2C_INTR_MASK_REG: |
| i2c->regs[offset] = val; |
| break; |
| |
| case I2C_INTR_MASK_OR_REG: |
| i2c->regs[I2C_INTR_MASK_REG] |= val; |
| break; |
| |
| case I2C_INTR_MASK_AND_REG: |
| i2c->regs[I2C_INTR_MASK_REG] &= val; |
| break; |
| |
| case I2C_PORT_BUSY_REG: |
| case I2C_SET_S_SCL_REG: |
| case I2C_RESET_S_SCL_REG: |
| case I2C_SET_S_SDA_REG: |
| case I2C_RESET_S_SDA_REG: |
| i2c->regs[offset] = val; |
| break; |
| default: |
| i2c->regs[I2C_STAT_REG] |= I2C_STAT_INVALID_CMD; |
| qemu_log_mask(LOG_GUEST_ERROR, "I2C: write at register: 0x%" |
| HWADDR_PRIx " val=0x%"PRIx64"\n", addr >> 3, val); |
| } |
| |
| pnv_i2c_update_irq(i2c); |
| } |
| |
| static const MemoryRegionOps pnv_i2c_xscom_ops = { |
| .read = pnv_i2c_xscom_read, |
| .write = pnv_i2c_xscom_write, |
| .valid.min_access_size = 8, |
| .valid.max_access_size = 8, |
| .impl.min_access_size = 8, |
| .impl.max_access_size = 8, |
| .endianness = DEVICE_BIG_ENDIAN, |
| }; |
| |
| static int pnv_i2c_bus_dt_xscom(PnvI2C *i2c, void *fdt, |
| int offset, int index) |
| { |
| int i2c_bus_offset; |
| const char i2c_compat[] = |
| "ibm,opal-i2c\0ibm,power8-i2c-port\0ibm,power9-i2c-port"; |
| g_autofree char *i2c_port_name = NULL; |
| g_autofree char *name = g_strdup_printf("i2c-bus@%x", index); |
| |
| i2c_bus_offset = fdt_add_subnode(fdt, offset, name); |
| _FDT(i2c_bus_offset); |
| |
| _FDT((fdt_setprop_cell(fdt, i2c_bus_offset, "reg", index))); |
| _FDT((fdt_setprop_cell(fdt, i2c_bus_offset, "#address-cells", 1))); |
| _FDT((fdt_setprop_cell(fdt, i2c_bus_offset, "#size-cells", 0))); |
| _FDT(fdt_setprop(fdt, i2c_bus_offset, "compatible", i2c_compat, |
| sizeof(i2c_compat))); |
| _FDT((fdt_setprop_cell(fdt, i2c_bus_offset, "bus-frequency", 400000))); |
| |
| i2c_port_name = g_strdup_printf("p8_%08x_e%dp%d", i2c->chip->chip_id, |
| i2c->engine, index); |
| _FDT(fdt_setprop_string(fdt, i2c_bus_offset, "ibm,port-name", |
| i2c_port_name)); |
| return 0; |
| } |
| |
| #define XSCOM_BUS_FREQUENCY 466500000 |
| #define I2C_CLOCK_FREQUENCY (XSCOM_BUS_FREQUENCY / 4) |
| |
| static int pnv_i2c_dt_xscom(PnvXScomInterface *dev, void *fdt, |
| int offset) |
| { |
| PnvI2C *i2c = PNV_I2C(dev); |
| int i2c_offset; |
| const char i2c_compat[] = "ibm,power8-i2cm\0ibm,power9-i2cm"; |
| uint32_t i2c_pcba = PNV9_XSCOM_I2CM_BASE + |
| i2c->engine * PNV9_XSCOM_I2CM_SIZE; |
| uint32_t reg[2] = { |
| cpu_to_be32(i2c_pcba), |
| cpu_to_be32(PNV9_XSCOM_I2CM_SIZE) |
| }; |
| int i; |
| g_autofree char *name = g_strdup_printf("i2cm@%x", i2c_pcba); |
| |
| i2c_offset = fdt_add_subnode(fdt, offset, name); |
| _FDT(i2c_offset); |
| |
| _FDT(fdt_setprop(fdt, i2c_offset, "reg", reg, sizeof(reg))); |
| |
| _FDT((fdt_setprop_cell(fdt, i2c_offset, "#address-cells", 1))); |
| _FDT((fdt_setprop_cell(fdt, i2c_offset, "#size-cells", 0))); |
| _FDT(fdt_setprop(fdt, i2c_offset, "compatible", i2c_compat, |
| sizeof(i2c_compat))); |
| _FDT((fdt_setprop_cell(fdt, i2c_offset, "chip-engine#", i2c->engine))); |
| _FDT((fdt_setprop_cell(fdt, i2c_offset, "clock-frequency", |
| I2C_CLOCK_FREQUENCY))); |
| |
| for (i = 0; i < i2c->num_busses; i++) { |
| pnv_i2c_bus_dt_xscom(i2c, fdt, i2c_offset, i); |
| } |
| return 0; |
| } |
| |
| static void pnv_i2c_reset(void *dev) |
| { |
| PnvI2C *i2c = PNV_I2C(dev); |
| |
| memset(i2c->regs, 0, sizeof(i2c->regs)); |
| |
| i2c->regs[I2C_STAT_REG] = I2C_STAT_CMD_COMP; |
| i2c->regs[I2C_EXTD_STAT_REG] = |
| SETFIELD(I2C_EXTD_STAT_FIFO_SIZE, 0ull, PNV_I2C_FIFO_SIZE) | |
| SETFIELD(I2C_EXTD_STAT_I2C_VERSION, 0ull, 23); /* last version */ |
| |
| fifo8_reset(&i2c->fifo); |
| } |
| |
| static void pnv_i2c_realize(DeviceState *dev, Error **errp) |
| { |
| PnvI2C *i2c = PNV_I2C(dev); |
| int i; |
| |
| assert(i2c->chip); |
| |
| pnv_xscom_region_init(&i2c->xscom_regs, OBJECT(i2c), &pnv_i2c_xscom_ops, |
| i2c, "xscom-i2c", PNV9_XSCOM_I2CM_SIZE); |
| |
| i2c->busses = g_new(I2CBus *, i2c->num_busses); |
| for (i = 0; i < i2c->num_busses; i++) { |
| char name[32]; |
| |
| snprintf(name, sizeof(name), TYPE_PNV_I2C ".%d", i); |
| i2c->busses[i] = i2c_init_bus(dev, name); |
| } |
| |
| fifo8_create(&i2c->fifo, PNV_I2C_FIFO_SIZE); |
| |
| qemu_register_reset(pnv_i2c_reset, dev); |
| |
| qdev_init_gpio_out(DEVICE(dev), &i2c->psi_irq, 1); |
| } |
| |
| static Property pnv_i2c_properties[] = { |
| DEFINE_PROP_LINK("chip", PnvI2C, chip, TYPE_PNV_CHIP, PnvChip *), |
| DEFINE_PROP_UINT32("engine", PnvI2C, engine, 1), |
| DEFINE_PROP_UINT32("num-busses", PnvI2C, num_busses, 1), |
| DEFINE_PROP_END_OF_LIST(), |
| }; |
| |
| static void pnv_i2c_class_init(ObjectClass *klass, void *data) |
| { |
| DeviceClass *dc = DEVICE_CLASS(klass); |
| PnvXScomInterfaceClass *xscomc = PNV_XSCOM_INTERFACE_CLASS(klass); |
| |
| xscomc->dt_xscom = pnv_i2c_dt_xscom; |
| |
| dc->desc = "PowerNV I2C"; |
| dc->realize = pnv_i2c_realize; |
| device_class_set_props(dc, pnv_i2c_properties); |
| } |
| |
| static const TypeInfo pnv_i2c_info = { |
| .name = TYPE_PNV_I2C, |
| .parent = TYPE_DEVICE, |
| .instance_size = sizeof(PnvI2C), |
| .class_init = pnv_i2c_class_init, |
| .interfaces = (InterfaceInfo[]) { |
| { TYPE_PNV_XSCOM_INTERFACE }, |
| { } |
| } |
| }; |
| |
| static void pnv_i2c_register_types(void) |
| { |
| type_register_static(&pnv_i2c_info); |
| } |
| |
| type_init(pnv_i2c_register_types); |
