From: Cédric Le Goater <c...@kaod.org>
The more recent IBM power processors have an embedded I2C
controller that is accessible by software via the XSCOM
address space.
Each instance of the I2C controller is capable of controlling
multiple I2C buses (one at a time). Prior to beginning a
transaction on an I2C bus, the bus must be selected by writing
the port number associated with the bus into the PORT_NUM
field of the MODE register. Once an I2C bus is selected,
the status of the bus can be determined by reading the
Status and Extended Status registers.
I2C bus transactions can be started by writing a command to
the Command register and reading/writing data from/to the
FIFO register.
Not supported :
. 10 bit I2C addresses
. Multimaster
. Slave
Signed-off-by: Cédric Le Goater <c...@kaod.org>
[milesg: Split wiring to powernv9 into its own commit]
[milesg: Added more detail to commit message]
[milesg: Added SPDX Licensed Identifier to new files]
[milesg: updated copyright dates]
[milesg: Added use of g_autofree]
[milesg: Added NULL check after pnv_i2c_get_bus]
Signed-off-by: Glenn Miles <mil...@linux.vnet.ibm.com>
Acked-by: Daniel Henrique Barboza <danielhb...@gmail.com>
Message-ID: <20231016222013.3739530-2-mil...@linux.vnet.ibm.com>
Signed-off-by: Daniel Henrique Barboza <danielhb...@gmail.com>
---
hw/ppc/meson.build | 1 +
hw/ppc/pnv_i2c.c | 697 +++++++++++++++++++++++++++++++++++++
include/hw/ppc/pnv_i2c.h | 38 ++
include/hw/ppc/pnv_xscom.h | 3 +
4 files changed, 739 insertions(+)
create mode 100644 hw/ppc/pnv_i2c.c
create mode 100644 include/hw/ppc/pnv_i2c.h
diff --git a/hw/ppc/meson.build b/hw/ppc/meson.build
index 7338f9432a..ea44856d43 100644
--- a/hw/ppc/meson.build
+++ b/hw/ppc/meson.build
@@ -43,6 +43,7 @@ ppc_ss.add(when: 'CONFIG_POWERNV', if_true: files(
'pnv.c',
'pnv_xscom.c',
'pnv_core.c',
+ 'pnv_i2c.c',
'pnv_lpc.c',
'pnv_psi.c',
'pnv_occ.c',
diff --git a/hw/ppc/pnv_i2c.c b/hw/ppc/pnv_i2c.c
new file mode 100644
index 0000000000..f75e59e709
--- /dev/null
+++ b/hw/ppc/pnv_i2c.c
@@ -0,0 +1,697 @@
+/*
+ * 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);
diff --git a/include/hw/ppc/pnv_i2c.h b/include/hw/ppc/pnv_i2c.h
new file mode 100644
index 0000000000..1a37730f1e
--- /dev/null
+++ b/include/hw/ppc/pnv_i2c.h
@@ -0,0 +1,38 @@
+/*
+ * QEMU PowerPC PowerNV Processor I2C model
+ *
+ * Copyright (c) 2019-2023, IBM Corporation.
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#ifndef PPC_PNV_I2C_H
+#define PPC_PNV_I2C_H
+
+#include "hw/ppc/pnv.h"
+#include "hw/i2c/i2c.h"
+#include "qemu/fifo8.h"
+
+#define TYPE_PNV_I2C "pnv-i2c"
+#define PNV_I2C(obj) OBJECT_CHECK(PnvI2C, (obj), TYPE_PNV_I2C)
+
+#define PNV_I2C_REGS 0x20
+
+typedef struct PnvI2C {
+ DeviceState parent;
+
+ struct PnvChip *chip;
+
+ qemu_irq psi_irq;
+
+ uint64_t regs[PNV_I2C_REGS];
+ uint32_t engine;
+ uint32_t num_busses;
+ I2CBus **busses;
+
+ MemoryRegion xscom_regs;
+
+ Fifo8 fifo;
+} PnvI2C;
+
+#endif /* PPC_PNV_I2C_H */
diff --git a/include/hw/ppc/pnv_xscom.h b/include/hw/ppc/pnv_xscom.h
index 35b19610f7..056392ab60 100644
--- a/include/hw/ppc/pnv_xscom.h
+++ b/include/hw/ppc/pnv_xscom.h
@@ -90,6 +90,9 @@ struct PnvXScomInterfaceClass {
((uint64_t)(((core) & 0x1C) + 0x40) << 22)
#define PNV9_XSCOM_EQ_SIZE 0x100000
+#define PNV9_XSCOM_I2CM_BASE 0xa0000
+#define PNV9_XSCOM_I2CM_SIZE 0x1000
+
#define PNV9_XSCOM_OCC_BASE PNV_XSCOM_OCC_BASE
#define PNV9_XSCOM_OCC_SIZE 0x8000
--
2.41.0
