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It does not support slave mode or DMA. Signed-off-by: Octavian Purdila --- hw/arm/svd/meson.build | 4 + hw/i2c/flexcomm_i2c.c | 224 ++++++++++++++++++++++++++++++++++ hw/i2c/meson.build | 1 + hw/i2c/trace-events | 10 ++ hw/misc/flexcomm.c | 6 + include/hw/i2c/flexcomm_i2c.h | 27 ++++ include/hw/misc/flexcomm.h | 4 + tests/unit/meson.build | 4 + 8 files changed, 280 insertions(+) create mode 100644 hw/i2c/flexcomm_i2c.c create mode 100644 include/hw/i2c/flexcomm_i2c.h diff --git a/hw/arm/svd/meson.build b/hw/arm/svd/meson.build index ed0f69f437..fa0d3da829 100644 --- a/hw/arm/svd/meson.build +++ b/hw/arm/svd/meson.build @@ -6,3 +6,7 @@ genh += custom_target('flexcomm_usart.h', output: 'flexcomm_usart.h', input: 'MIMXRT595S_cm33.xml', command: [ svd_gen_header, '-i', '@INPUT@', '-o', '@OUTPUT@', '-p', 'USART0', '-t', 'FLEXCOMM_USART']) +genh += custom_target('flexcomm_i2c_regs.h', + output: 'flexcomm_i2c.h', + input: 'MIMXRT595S_cm33.xml', + command: [ svd_gen_header, '-i', '@INPUT@', '-o', '@OUTPUT@', '-p', 'I2C0', '-t', 'FLEXCOMM_I2C']) diff --git a/hw/i2c/flexcomm_i2c.c b/hw/i2c/flexcomm_i2c.c new file mode 100644 index 0000000000..7e74f858ce --- /dev/null +++ b/hw/i2c/flexcomm_i2c.c @@ -0,0 +1,224 @@ +/* + * QEMU model for NXP's FLEXCOMM I2C + * + * Copyright (c) 2024 Google LLC + * + * SPDX-License-Identifier: GPL-2.0-or-later + * + * This work is licensed under the terms of the GNU GPL, version 2 or later. + * See the COPYING file in the top-level directory. + */ + +#include "qemu/osdep.h" +#include "qemu/cutils.h" +#include "hw/irq.h" +#include "hw/qdev-properties.h" +#include "qemu/log.h" +#include "qemu/module.h" +#include "exec/address-spaces.h" +#include "qapi/error.h" +#include "trace.h" +#include "hw/regs.h" +#include "hw/i2c/flexcomm_i2c.h" + +#define reg(field) offsetof(FLEXCOMM_I2C_Type, field) +#define regi(x) (reg(x) / sizeof(uint32_t)) +#define REG_NO (sizeof(FLEXCOMM_I2C_Type) / sizeof(uint32_t)) + +static FLEXCOMM_I2C_REGISTER_NAMES_ARRAY(reg_names); + +static void flexcomm_i2c_reset(FlexcommState *s) +{ + flexcomm_i2c_reset_registers(&s->regs.i2c); +} + +static void flexcomm_i2c_irq_update(FlexcommState *s) +{ + bool enabled = s->regs.i2c.CFG_b.MSTEN; + bool irq, per_irqs; + + s->regs.i2c.INTSTAT = s->regs.i2c.STAT & s->regs.i2c.INTENSET; + per_irqs = s->regs.i2c.INTSTAT != 0; + + irq = enabled && per_irqs; + + trace_flexcomm_i2c_irq(DEVICE(s)->id, irq, per_irqs, enabled); + flexcomm_irq(s, irq); +} + +static MemTxResult flexcomm_i2c_reg_read(void *opaque, FlexcommState *s, + int f, hwaddr addr, uint64_t *data, + unsigned size) +{ + MemTxResult ret = MEMTX_OK; + + if (!reg32_aligned_access(addr, size)) { + ret = MEMTX_ERROR; + goto out; + } + + *data = reg32_read(&s->regs, addr); + + flexcomm_i2c_irq_update(s); + +out: + trace_flexcomm_i2c_reg_read(DEVICE(s)->id, reg_names[addr], addr, *data); + return ret; +} + +static MemTxResult flexcomm_i2c_reg_write(void *opaque, FlexcommState *s, + int f, hwaddr addr, uint64_t value, + unsigned size) +{ + MemTxResult ret = MEMTX_OK; + static uint32_t mask[REG_NO] = { + [regi(CFG)] = BITS(5, 0), + [regi(STAT)] = BITS(25, 24) | BIT(19) | BIT(17) | BIT(15) | BIT(6), + [regi(INTENSET)] = BITS(25, 24) | BIT(19) | BITS(17, 15) | BIT(11) | + BIT(8) | BIT(6) | BIT(4) | BIT(0), + [regi(INTENCLR)] = BITS(25, 24) | BIT(19) | BITS(17, 15) | BIT(11) | + BIT(8) | BIT(6) | BIT(4) | BIT(0), + [regi(TIMEOUT)] = BITS(15, 0), + [regi(CLKDIV)] = BITS(15, 0), + [regi(MSTCTL)] = BITS(3, 0), + [regi(MSTTIME)] = BITS(6, 4) | BITS(2, 0), + [regi(MSTDAT)] = BITS(7, 0), + [regi(SLVCTL)] = BITS(9, 8) | BIT(3) | BITS(1, 0), + [regi(SLVDAT)] = BITS(7, 0), + [regi(SLVADR0)] = BIT(15) | BITS(7, 0), + [regi(SLVADR1)] = BIT(15) | BITS(7, 0), + [regi(SLVADR2)] = BIT(15) | BITS(7, 0), + [regi(SLVADR3)] = BIT(15) | BITS(7, 0), + [regi(SLVQUAL0)] = BITS(7, 0), + }; + + if (!reg32_aligned_access(addr, size)) { + ret = MEMTX_ERROR; + goto out; + } + + switch (addr) { + case reg(CFG): + { + reg32_write(&s->regs, addr, value, mask); + if (s->regs.i2c.CFG_b.SLVEN) { + qemu_log_mask(LOG_GUEST_ERROR, "I2C slave not supported"); + } + if (s->regs.i2c.CFG_b.MONEN) { + qemu_log_mask(LOG_GUEST_ERROR, "I2C monitoring not supported"); + } + break; + } + case reg(INTENCLR): + { + s->regs.i2c.INTENSET &= ~(value & mask[addr / 4]); + break; + } + case reg(TIMEOUT): + { + reg32_write(&s->regs, addr, value, mask); + /* The bottom 4 bits are hard-wired to 0xF */ + s->regs.i2c.TIMEOUT_b.TOMIN = 0xf; + break; + } + case reg(MSTCTL): + { + reg32_write(&s->regs, addr, value, mask); + if (s->regs.i2c.MSTCTL_b.MSTSTART) { + uint8_t i2c_addr = s->regs.i2c.MSTDAT_b.DATA; + bool recv = i2c_addr & 1; + + trace_flexcomm_i2c_start(DEVICE(s)->id, i2c_addr, recv); + if (i2c_start_transfer(s->i2c, i2c_addr, recv)) { + s->regs.i2c.STAT_b.MSTSTATE = MSTSTATE_NAKADR; + trace_flexcomm_i2c_nak(DEVICE(s)->id); + } else { + if (recv) { + uint8_t data = i2c_recv(s->i2c); + + s->regs.i2c.MSTDAT_b.DATA = data; + trace_flexcomm_i2c_rx(DEVICE(s)->id, data); + s->regs.i2c.STAT_b.MSTSTATE = MSTSTATE_RXRDY; + } else { + s->regs.i2c.STAT_b.MSTSTATE = MSTSTATE_TXRDY; + } + } + } + if (s->regs.i2c.MSTCTL_b.MSTSTOP) { + s->regs.i2c.STAT_b.MSTSTATE = MSTSTATE_IDLE; + i2c_end_transfer(s->i2c); + } + if (s->regs.i2c.MSTCTL_b.MSTCONTINUE) { + if (s->regs.i2c.STAT_b.MSTSTATE == MSTSTATE_TXRDY) { + uint8_t data = s->regs.i2c.MSTDAT_b.DATA; + + trace_flexcomm_i2c_tx(DEVICE(s)->id, data); + if (i2c_send(s->i2c, data)) { + s->regs.i2c.STAT_b.MSTSTATE = MSTSTATE_NAKDAT; + } + } else if (s->regs.i2c.STAT_b.MSTSTATE == MSTSTATE_RXRDY) { + uint8_t data = i2c_recv(s->i2c); + + s->regs.i2c.MSTDAT_b.DATA = data; + trace_flexcomm_i2c_rx(DEVICE(s)->id, data); + } + } + break; + } + case reg(STAT): + { + /* write 1 to clear bits */ + s->regs.i2c.STAT &= ~(value & mask[addr / 4]); + break; + } + case reg(SLVCTL): + case reg(SLVDAT): + case reg(SLVADR0): + case reg(SLVADR1): + case reg(SLVADR2): + case reg(SLVADR3): + case reg(SLVQUAL0): + { + qemu_log_mask(LOG_GUEST_ERROR, "I2C slave not supported\n"); + break; + } + default: + reg32_write(&s->regs, addr, value, mask); + break; + } + + flexcomm_i2c_irq_update(s); + +out: + trace_flexcomm_i2c_reg_write(DEVICE(s)->id, reg_names[addr], addr, value); + return ret; +} + +static void flexcomm_i2c_select(void *opaque, FlexcommState *s, int f, + bool set) +{ + if (set) { + flexcomm_i2c_reset(s); + } +} + +static const FlexcommFunctionOps flexcomm_i2c_ops = { + .select = flexcomm_i2c_select, + .reg_read = flexcomm_i2c_reg_read, + .reg_write = flexcomm_i2c_reg_write, +}; + +void flexcomm_i2c_init(FlexcommState *s) +{ + s->i2c = i2c_init_bus(DEVICE(s), "i2c"); +} + +void flexcomm_i2c_register(void) +{ + Error *err = NULL; + + if (!flexcomm_register_ops(FLEXCOMM_FUNC_I2C, NULL, + &flexcomm_i2c_ops, &err)) { + error_report_err(err); + } +} diff --git a/hw/i2c/meson.build b/hw/i2c/meson.build index c459adcb59..e7d79e6938 100644 --- a/hw/i2c/meson.build +++ b/hw/i2c/meson.build @@ -18,4 +18,5 @@ i2c_ss.add(when: 'CONFIG_PPC4XX', if_true: files('ppc4xx_i2c.c')) i2c_ss.add(when: 'CONFIG_PCA954X', if_true: files('i2c_mux_pca954x.c')) i2c_ss.add(when: 'CONFIG_PMBUS', if_true: files('pmbus_device.c')) i2c_ss.add(when: 'CONFIG_BCM2835_I2C', if_true: files('bcm2835_i2c.c')) +i2c_ss.add(when: 'CONFIG_FLEXCOMM', if_true: files('flexcomm_i2c.c')) system_ss.add_all(when: 'CONFIG_I2C', if_true: i2c_ss) diff --git a/hw/i2c/trace-events b/hw/i2c/trace-events index 6900e06eda..9f0175fab7 100644 --- a/hw/i2c/trace-events +++ b/hw/i2c/trace-events @@ -51,3 +51,13 @@ npcm7xx_smbus_recv_fifo(const char *id, uint8_t received, uint8_t expected) "%s pca954x_write_bytes(uint8_t value) "PCA954X write data: 0x%02x" pca954x_read_data(uint8_t value) "PCA954X read data: 0x%02x" + +# flexcomm_i2c.c + +flexcomm_i2c_reg_read(const char *id, const char *reg_name, uint32_t addr, uint32_t val) " %s: %s[0x%04x] -> 0x%08x" +flexcomm_i2c_reg_write(const char *id, const char *reg_name, uint32_t addr, uint32_t val) "%s: %s[0x%04x] <- 0x%08x" +flexcomm_i2c_start(const char *id, uint8_t addr, uint8_t recv) "%s: 0x%02x %d" +flexcomm_i2c_rx(const char *id, uint8_t data) "%s: <- 0x%02x" +flexcomm_i2c_tx(const char *id, uint8_t data) "%s: -> 0x%02x" +flexcomm_i2c_nak(const char *id) "%s: <- nak" +flexcomm_i2c_irq(const char *id, bool irq, bool perirqs, bool enabled) "%s: %d %d %d" diff --git a/hw/misc/flexcomm.c b/hw/misc/flexcomm.c index 0c94928aa2..2722c1d6a9 100644 --- a/hw/misc/flexcomm.c +++ b/hw/misc/flexcomm.c @@ -23,6 +23,7 @@ #include "hw/regs.h" #include "hw/misc/flexcomm.h" #include "hw/char/flexcomm_usart.h" +#include "hw/i2c/flexcomm_i2c.h" #define reg(field) offsetof(FLEXCOMM_Type, field) #define regi(x) (reg(x) / sizeof(uint32_t)) @@ -228,6 +229,10 @@ static void flexcomm_realize(DeviceState *dev, Error **errp) if (has_function(s, FLEXCOMM_FUNC_USART)) { flexcomm_usart_init(s); } + + if (has_function(s, FLEXCOMM_FUNC_I2C)) { + flexcomm_i2c_init(s); + } } static void flexcomm_class_init(ObjectClass *klass, void *data) @@ -239,6 +244,7 @@ static void flexcomm_class_init(ObjectClass *klass, void *data) dc->realize = flexcomm_realize; flexcomm_usart_register(); + flexcomm_i2c_register(); } static const TypeInfo flexcomm_info = { diff --git a/include/hw/i2c/flexcomm_i2c.h b/include/hw/i2c/flexcomm_i2c.h new file mode 100644 index 0000000000..aea01f13bd --- /dev/null +++ b/include/hw/i2c/flexcomm_i2c.h @@ -0,0 +1,27 @@ +/* + * QEMU model for NXP's FLEXCOMM I2C + * + * Copyright (c) 2024 Google LLC + * + * SPDX-License-Identifier: GPL-2.0-or-later + * + * This work is licensed under the terms of the GNU GPL, version 2 or later. + * See the COPYING file in the top-level directory. + */ + +#ifndef HW_CHAR_FLEXCOMM_I2C_H +#define HW_CHAR_FLEXCOMM_I2C_H + +#include "hw/misc/flexcomm.h" + +void flexcomm_i2c_init(FlexcommState *s); +void flexcomm_i2c_register(void); + +#define MSTSTATE_IDLE 0 +#define MSTSTATE_RXRDY 1 +#define MSTSTATE_TXRDY 2 +#define MSTSTATE_NAKADR 3 +#define MSTSTATE_NAKDAT 4 + + +#endif /* HW_CHAR_FLEXCOMM_I2C_H */ diff --git a/include/hw/misc/flexcomm.h b/include/hw/misc/flexcomm.h index db76e32c6d..3d042a3511 100644 --- a/include/hw/misc/flexcomm.h +++ b/include/hw/misc/flexcomm.h @@ -14,8 +14,10 @@ #include "hw/sysbus.h" #include "chardev/char-fe.h" +#include "hw/i2c/i2c.h" #include "hw/arm/svd/flexcomm.h" #include "hw/arm/svd/flexcomm_usart.h" +#include "hw/arm/svd/flexcomm_i2c.h" #include "qemu/fifo32.h" #define TYPE_FLEXCOMM "flexcomm" @@ -46,6 +48,7 @@ typedef struct { union { FLEXCOMM_Type flex; FLEXCOMM_USART_Type usart; + FLEXCOMM_I2C_Type i2c; } regs; uint32_t functions; qemu_irq irq; @@ -53,6 +56,7 @@ typedef struct { CharBackend chr; Fifo32 tx_fifo; Fifo32 rx_fifo; + I2CBus *i2c; } FlexcommState; typedef struct { diff --git a/tests/unit/meson.build b/tests/unit/meson.build index dcfd2e661c..4c22cb3ccc 100644 --- a/tests/unit/meson.build +++ b/tests/unit/meson.build @@ -148,6 +148,8 @@ if have_system meson.project_source_root() / 'tests/unit/sysbus-mock.c', meson.project_source_root() / 'hw/misc/flexcomm.c', meson.project_source_root() / 'hw/char/flexcomm_usart.c', + meson.project_source_root() / 'hw/i2c/flexcomm_i2c.c', + meson.project_source_root() / 'hw/i2c/core.c', ], 'test-flexcomm-usart': [ hwcore, chardev, qom, migration, @@ -155,6 +157,8 @@ if have_system meson.project_source_root() / 'tests/unit/sysbus-mock.c', meson.project_source_root() / 'hw/misc/flexcomm.c', meson.project_source_root() / 'hw/char/flexcomm_usart.c', + meson.project_source_root() / 'hw/i2c/flexcomm_i2c.c', + meson.project_source_root() / 'hw/i2c/core.c', ], } if config_host_data.get('CONFIG_INOTIFY1') -- 2.46.0.rc2.264.g509ed76dc8-goog