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[PATCH] ppc/pnv: Add an I2C master controller model
|
From: |
Glenn Miles |
|
Subject: |
[PATCH] ppc/pnv: Add an I2C master controller model |
|
Date: |
Mon, 9 Oct 2023 13:05:39 -0500 |
From: Cédric Le Goater <clg@kaod.org>
Not supported :
. 10 bit addresses
. multimaster
. slave
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Glenn Miles <milesg@linux.vnet.ibm.com>
[milesg: fixed formatting warning]
---
hw/ppc/meson.build | 1 +
hw/ppc/pnv.c | 26 ++
hw/ppc/pnv_i2c.c | 678 +++++++++++++++++++++++++++++++++++++
include/hw/ppc/pnv_chip.h | 4 +
include/hw/ppc/pnv_i2c.h | 39 +++
include/hw/ppc/pnv_xscom.h | 3 +
6 files changed, 751 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 7c2c52434a..87b756a701 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.c b/hw/ppc/pnv.c
index eb54f93986..32b6d9889d 100644
--- a/hw/ppc/pnv.c
+++ b/hw/ppc/pnv.c
@@ -1438,6 +1438,10 @@ static void pnv_chip_power9_instance_init(Object *obj)
object_initialize_child(obj, "pec[*]", &chip9->pecs[i],
TYPE_PNV_PHB4_PEC);
}
+
+ for (i = 0; i < PNV9_CHIP_MAX_I2C; i++) {
+ object_initialize_child(obj, "i2c[*]", &chip9->i2c[i], TYPE_PNV_I2C);
+ }
}
static void pnv_chip_quad_realize_one(PnvChip *chip, PnvQuad *eq,
@@ -1510,6 +1514,7 @@ static void pnv_chip_power9_realize(DeviceState *dev,
Error **errp)
PnvChip *chip = PNV_CHIP(dev);
Pnv9Psi *psi9 = &chip9->psi;
Error *local_err = NULL;
+ int i;
/* XSCOM bridge is first */
pnv_xscom_realize(chip, PNV9_XSCOM_SIZE, &local_err);
@@ -1613,6 +1618,27 @@ static void pnv_chip_power9_realize(DeviceState *dev,
Error **errp)
error_propagate(errp, local_err);
return;
}
+
+ /*
+ * I2C
+ * TODO: The number of busses is specific to each platform
+ */
+ for (i = 0; i < PNV9_CHIP_MAX_I2C; i++) {
+ Object *obj = OBJECT(&chip9->i2c[i]);
+
+ object_property_set_int(obj, "engine", i + 1, &error_fatal);
+ object_property_set_int(obj, "num-busses", 1, &error_fatal);
+ object_property_set_link(obj, "chip", OBJECT(chip), &error_abort);
+ if (!qdev_realize(DEVICE(obj), NULL, errp)) {
+ return;
+ }
+ pnv_xscom_add_subregion(chip, PNV9_XSCOM_I2CM_BASE +
+ chip9->i2c[i].engine * PNV9_XSCOM_I2CM_SIZE,
+ &chip9->i2c[i].xscom_regs);
+ qdev_connect_gpio_out(DEVICE(&chip9->i2c[i]), 0,
+ qdev_get_gpio_in(DEVICE(&chip9->psi),
+ PSIHB9_IRQ_SBE_I2C));
+ }
}
static uint32_t pnv_chip_power9_xscom_pcba(PnvChip *chip, uint64_t addr)
diff --git a/hw/ppc/pnv_i2c.c b/hw/ppc/pnv_i2c.c
new file mode 100644
index 0000000000..8c191912bf
--- /dev/null
+++ b/hw/ppc/pnv_i2c.c
@@ -0,0 +1,678 @@
+/*
+ * QEMU PowerPC PowerNV Processor I2C model
+ *
+ * Copyright (c) 2019-2021, IBM Corporation.
+ *
+ * This code is licensed under the GPL version 2 or later. See the
+ * COPYING file in the top-level directory.
+ */
+
+#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 (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 (!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 (!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 (!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;
+ if (i2c_bus_busy(pnv_i2c_get_bus(i2c))) {
+ 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)
+{
+ char *name;
+ int i2c_bus_offset;
+ const char i2c_compat[] =
+ "ibm,opal-i2c\0ibm,power8-i2c-port\0ibm,power9-i2c-port";
+ char *i2c_port_name;
+
+ name = g_strdup_printf("i2c-bus@%x", index);
+ i2c_bus_offset = fdt_add_subnode(fdt, offset, name);
+ _FDT(i2c_bus_offset);
+ g_free(name);
+
+ _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));
+ g_free(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);
+ char *name;
+ 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;
+
+ name = g_strdup_printf("i2cm@%x", i2c_pcba);
+ i2c_offset = fdt_add_subnode(fdt, offset, name);
+ _FDT(i2c_offset);
+ g_free(name);
+
+ _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_chip.h b/include/hw/ppc/pnv_chip.h
index 53e1d921d7..3bbe2783c9 100644
--- a/include/hw/ppc/pnv_chip.h
+++ b/include/hw/ppc/pnv_chip.h
@@ -9,6 +9,7 @@
#include "hw/ppc/pnv_psi.h"
#include "hw/ppc/pnv_sbe.h"
#include "hw/ppc/pnv_xive.h"
+#include "hw/ppc/pnv_i2c.h"
#include "hw/sysbus.h"
OBJECT_DECLARE_TYPE(PnvChip, PnvChipClass,
@@ -86,6 +87,9 @@ struct Pnv9Chip {
#define PNV9_CHIP_MAX_PEC 3
PnvPhb4PecState pecs[PNV9_CHIP_MAX_PEC];
+
+#define PNV9_CHIP_MAX_I2C 3
+ PnvI2C i2c[PNV9_CHIP_MAX_I2C];
};
/*
diff --git a/include/hw/ppc/pnv_i2c.h b/include/hw/ppc/pnv_i2c.h
new file mode 100644
index 0000000000..8bb5ecf6bc
--- /dev/null
+++ b/include/hw/ppc/pnv_i2c.h
@@ -0,0 +1,39 @@
+/*
+ * QEMU PowerPC PowerNV Processor I2C model
+ *
+ * Copyright (c) 2019-2021, IBM Corporation.
+ *
+ * This code is licensed under the GPL version 2 or later. See the
+ * COPYING file in the top-level directory.
+ */
+
+#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 9bc6463547..0c8b873c4c 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
--
2.31.1
- [PATCH] ppc/pnv: Add an I2C master controller model,
Glenn Miles <=