/* $OpenBSD: qciic_fdt.c,v 1.1 2022/11/06 15:36:13 patrick Exp $ */ /* * Copyright (c) 2022 Mark Kettenis * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ #include #include #include #include #include #include #include #include #include #define _I2C_PRIVATE #include /* Registers */ #define GENI_I2C_TX_TRANS_LEN 0x26c #define GENI_I2C_RX_TRANS_LEN 0x270 #define GENI_M_CMD0 0x600 #define GENI_M_CMD0_OPCODE_I2C_WRITE (0x1 << 27) #define GENI_M_CMD0_OPCODE_I2C_READ (0x2 << 27) #define GENI_M_CMD0_SLV_ADDR_SHIFT 9 #define GENI_M_CMD0_STOP_STRETCH (1 << 2) #define GENI_M_IRQ_STATUS 0x610 #define GENI_M_IRQ_CLEAR 0x618 #define GENI_M_IRQ_CMD_DONE (1 << 0) #define GENI_TX_FIFO 0x700 #define GENI_RX_FIFO 0x780 #define GENI_TX_FIFO_STATUS 0x800 #define GENI_RX_FIFO_STATUS 0x804 #define GENI_RX_FIFO_STATUS_WC(val) ((val) & 0xffffff) #define HREAD4(sc, reg) \ (bus_space_read_4((sc)->sc_iot, (sc)->sc_ioh, (reg))) #define HWRITE4(sc, reg, val) \ bus_space_write_4((sc)->sc_iot, (sc)->sc_ioh, (reg), (val)) struct qciic_fdt_softc { struct device sc_dev; bus_space_tag_t sc_iot; bus_space_handle_t sc_ioh; int sc_node; struct device *sc_iic; struct i2c_controller sc_ic; }; int qciic_fdt_match(struct device *, void *, void *); void qciic_fdt_attach(struct device *, struct device *, void *); const struct cfattach qciic_fdt_ca = { sizeof (struct qciic_fdt_softc), qciic_fdt_match, qciic_fdt_attach }; int qciic_fdt_acquire_bus(void *, int); void qciic_fdt_release_bus(void *, int); int qciic_fdt_exec(void *, i2c_op_t, i2c_addr_t, const void *, size_t, void *, size_t, int); void *qciic_fdt_i2c_intr_establish(void *, void *, int, int (*)(void *), void *, const char *); void qciic_fdt_i2c_intr_disestablish(void *, void *); const char *qciic_fdt_i2c_intr_string(void *, void *); void qciic_fdt_bus_scan(struct device *, struct i2cbus_attach_args *, void *); int qciic_fdt_match(struct device *parent, void *match, void *aux) { struct fdt_attach_args *faa = aux; return OF_is_compatible(faa->fa_node, "qcom,geni-i2c"); } void qciic_fdt_attach(struct device *parent, struct device *self, void *aux) { struct qciic_fdt_softc *sc = (struct qciic_fdt_softc *)self; struct fdt_attach_args *faa = aux; struct i2cbus_attach_args iba; sc->sc_node = faa->fa_node; sc->sc_iot = faa->fa_iot; if (bus_space_map(sc->sc_iot, faa->fa_reg[0].addr, faa->fa_reg[0].size, 0, &sc->sc_ioh)) { printf(": can't map registers\n"); return; } printf("\n"); sc->sc_ic.ic_cookie = sc; sc->sc_ic.ic_acquire_bus = qciic_fdt_acquire_bus; sc->sc_ic.ic_release_bus = qciic_fdt_release_bus; sc->sc_ic.ic_exec = qciic_fdt_exec; sc->sc_ic.ic_intr_establish = qciic_fdt_i2c_intr_establish; sc->sc_ic.ic_intr_disestablish = qciic_fdt_i2c_intr_disestablish; sc->sc_ic.ic_intr_string = qciic_fdt_i2c_intr_string; memset(&iba, 0, sizeof(iba)); iba.iba_name = "iic"; iba.iba_tag = &sc->sc_ic; iba.iba_bus_scan = qciic_fdt_bus_scan; iba.iba_bus_scan_arg = &sc->sc_node; config_found(&sc->sc_dev, &iba, iicbus_print); } int qciic_fdt_acquire_bus(void *cookie, int flags) { return 0; } void qciic_fdt_release_bus(void *cookie, int flags) { } int qciic_fdt_wait(struct qciic_fdt_softc *sc, uint32_t bits) { uint32_t stat; int timo; for (timo = 50000; timo > 0; timo--) { stat = HREAD4(sc, GENI_M_IRQ_STATUS); if (stat & bits) break; delay(10); } if (timo == 0) return ETIMEDOUT; return 0; } int qciic_fdt_read(struct qciic_fdt_softc *sc, uint8_t *buf, size_t len) { uint32_t stat, word; int timo, i; word = 0; for (i = 0; i < len; i++) { if ((i % 4) == 0) { for (timo = 50000; timo > 0; timo--) { stat = HREAD4(sc, GENI_RX_FIFO_STATUS); if (GENI_RX_FIFO_STATUS_WC(stat) > 0) break; delay(10); } if (timo == 0) return ETIMEDOUT; word = HREAD4(sc, GENI_RX_FIFO); } buf[i] = word >> ((i % 4) * 8); } return 0; } int qciic_fdt_write(struct qciic_fdt_softc *sc, const uint8_t *buf, size_t len) { uint32_t stat, word; int timo, i; word = 0; for (i = 0; i < len; i++) { word |= buf[i] << ((i % 4) * 8); if ((i % 4) == 3 || i == (len - 1)) { for (timo = 50000; timo > 0; timo--) { stat = HREAD4(sc, GENI_TX_FIFO_STATUS); if (stat < 16) break; delay(10); } if (timo == 0) return ETIMEDOUT; HWRITE4(sc, GENI_TX_FIFO, word); word = 0; } } return 0; } int qciic_fdt_exec(void *cookie, i2c_op_t op, i2c_addr_t addr, const void *cmd, size_t cmdlen, void *buf, size_t buflen, int flags) { struct qciic_fdt_softc *sc = cookie; uint32_t m_cmd, m_param, stat; int error; m_param = addr << GENI_M_CMD0_SLV_ADDR_SHIFT; m_param |= GENI_M_CMD0_STOP_STRETCH; if (buflen == 0 && I2C_OP_STOP_P(op)) m_param &= ~GENI_M_CMD0_STOP_STRETCH; if (cmdlen > 0) { stat = HREAD4(sc, GENI_M_IRQ_STATUS); HWRITE4(sc, GENI_M_IRQ_CLEAR, stat); HWRITE4(sc, GENI_I2C_TX_TRANS_LEN, cmdlen); m_cmd = GENI_M_CMD0_OPCODE_I2C_WRITE | m_param; HWRITE4(sc, GENI_M_CMD0, m_cmd); error = qciic_fdt_write(sc, cmd, cmdlen); if (error) return error; error = qciic_fdt_wait(sc, GENI_M_IRQ_CMD_DONE); if (error) return error; } if (buflen == 0) return 0; if (I2C_OP_STOP_P(op)) m_param &= ~GENI_M_CMD0_STOP_STRETCH; if (I2C_OP_READ_P(op)) { stat = HREAD4(sc, GENI_M_IRQ_STATUS); HWRITE4(sc, GENI_M_IRQ_CLEAR, stat); HWRITE4(sc, GENI_I2C_RX_TRANS_LEN, buflen); m_cmd = GENI_M_CMD0_OPCODE_I2C_READ | m_param; HWRITE4(sc, GENI_M_CMD0, m_cmd); error = qciic_fdt_read(sc, buf, buflen); if (error) return error; error = qciic_fdt_wait(sc, GENI_M_IRQ_CMD_DONE); if (error) return error; } else { stat = HREAD4(sc, GENI_M_IRQ_STATUS); HWRITE4(sc, GENI_M_IRQ_CLEAR, stat); HWRITE4(sc, GENI_I2C_TX_TRANS_LEN, buflen); m_cmd = GENI_M_CMD0_OPCODE_I2C_WRITE | m_param; HWRITE4(sc, GENI_M_CMD0, m_cmd); error = qciic_fdt_write(sc, buf, buflen); if (error) return error; error = qciic_fdt_wait(sc, GENI_M_IRQ_CMD_DONE); if (error) return error; } return 0; } void * qciic_fdt_i2c_intr_establish(void *cookie, void *ih, int level, int (*func)(void *), void *arg, const char *name) { int node = *(int *)ih; return fdt_intr_establish(node, level, func, arg, (char *)name); } void qciic_fdt_i2c_intr_disestablish(void *cookie, void *ih) { fdt_intr_disestablish(ih); } const char * qciic_fdt_i2c_intr_string(void *cookie, void *ih) { static char irqstr[64]; snprintf(irqstr, sizeof(irqstr), "irq"); return irqstr; } void qciic_fdt_bus_scan(struct device *self, struct i2cbus_attach_args *iba, void *aux) { int iba_node = *(int *)aux; extern int iic_print(void *, const char *); struct i2c_attach_args ia; char name[32], status[32]; uint32_t reg[1]; int node; for (node = OF_child(iba_node); node; node = OF_peer(node)) { memset(name, 0, sizeof(name)); memset(status, 0, sizeof(status)); memset(reg, 0, sizeof(reg)); if (OF_getprop(node, "compatible", name, sizeof(name)) == -1) continue; if (name[0] == '\0') continue; if (OF_getprop(node, "status", status, sizeof(status)) > 0 && strcmp(status, "disabled") == 0) continue; if (OF_getprop(node, "reg", ®, sizeof(reg)) != sizeof(reg)) continue; memset(&ia, 0, sizeof(ia)); ia.ia_tag = iba->iba_tag; ia.ia_addr = bemtoh32(®[0]); ia.ia_name = name; ia.ia_cookie = &node; ia.ia_intr = &node; /* Quirk for ihidev(4) */ if (strcmp(name, "hid-over-i2c") == 0) { ia.ia_name = "ihidev"; ia.ia_size = OF_getpropint(node, "hid-descr-addr", 0); ia.ia_cookie = name; } config_found(self, &ia, iic_print); } }