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[2001:b011:7010:358e:c990:a8c9:85a7:1d3e]) by smtp.gmail.com with ESMTPSA id g11-20020aa79dcb000000b0050dc7628188sm10429420pfq.98.2022.05.10.02.19.07 (version=TLS1_2 cipher=ECDHE-ECDSA-CHACHA20-POLY1305 bits=256/256); Tue, 10 May 2022 02:21:04 -0700 (PDT) From: Tyrone Ting To: avifishman70@gmail.com, tmaimon77@gmail.com, tali.perry1@gmail.com, venture@google.com, yuenn@google.com, benjaminfair@google.com, robh+dt@kernel.org, krzysztof.kozlowski@canonical.com, wsa@kernel.org, andriy.shevchenko@linux.intel.com, jarkko.nikula@linux.intel.com, semen.protsenko@linaro.org, sven@svenpeter.dev, jie.deng@intel.com, jsd@semihalf.com, lukas.bulwahn@gmail.com, olof@lixom.net, arnd@arndb.de, warp5tw@gmail.com, tali.perry@nuvoton.com, Avi.Fishman@nuvoton.com, tomer.maimon@nuvoton.com, KWLIU@nuvoton.com, JJLIU0@nuvoton.com, kfting@nuvoton.com Cc: openbmc@lists.ozlabs.org, linux-i2c@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v4 9/9] i2c: npcm: Support NPCM845 Date: Tue, 10 May 2022 17:16:54 +0800 Message-Id: <20220510091654.8498-10-warp5tw@gmail.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20220510091654.8498-1-warp5tw@gmail.com> References: <20220510091654.8498-1-warp5tw@gmail.com> Precedence: bulk List-ID: X-Mailing-List: linux-i2c@vger.kernel.org From: Tyrone Ting Add NPCM8XX I2C support. The NPCM8XX uses a similar i2c module as NPCM7XX. The internal HW FIFO is larger in NPCM8XX. Signed-off-by: Tyrone Ting --- drivers/i2c/busses/Kconfig | 8 +-- drivers/i2c/busses/Makefile | 2 +- drivers/i2c/busses/i2c-npcm7xx.c | 114 +++++++++++++++++++------------ 3 files changed, 76 insertions(+), 48 deletions(-) diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig index a1bae59208e3..b1d7069dd377 100644 --- a/drivers/i2c/busses/Kconfig +++ b/drivers/i2c/busses/Kconfig @@ -838,13 +838,13 @@ config I2C_NOMADIK I2C interface from ST-Ericsson's Nomadik and Ux500 architectures, as well as the STA2X11 PCIe I/O HUB. -config I2C_NPCM7XX +config I2C_NPCM tristate "Nuvoton I2C Controller" - depends on ARCH_NPCM7XX || COMPILE_TEST + depends on ARCH_NPCM || COMPILE_TEST help If you say yes to this option, support will be included for the - Nuvoton I2C controller, which is available on the NPCM7xx BMC - controller. + Nuvoton I2C controller, which is available on the NPCM BMC + controllers. Driver can also support slave mode (select I2C_SLAVE). config I2C_OCORES diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile index 479f60e4ee3d..b0a10e5d9ee9 100644 --- a/drivers/i2c/busses/Makefile +++ b/drivers/i2c/busses/Makefile @@ -84,7 +84,7 @@ obj-$(CONFIG_I2C_MT7621) += i2c-mt7621.o obj-$(CONFIG_I2C_MV64XXX) += i2c-mv64xxx.o obj-$(CONFIG_I2C_MXS) += i2c-mxs.o obj-$(CONFIG_I2C_NOMADIK) += i2c-nomadik.o -obj-$(CONFIG_I2C_NPCM7XX) += i2c-npcm7xx.o +obj-$(CONFIG_I2C_NPCM) += i2c-npcm7xx.o obj-$(CONFIG_I2C_OCORES) += i2c-ocores.o obj-$(CONFIG_I2C_OMAP) += i2c-omap.o obj-$(CONFIG_I2C_OWL) += i2c-owl.o diff --git a/drivers/i2c/busses/i2c-npcm7xx.c b/drivers/i2c/busses/i2c-npcm7xx.c index 29d8a44b23c4..415a24df78e9 100644 --- a/drivers/i2c/busses/i2c-npcm7xx.c +++ b/drivers/i2c/busses/i2c-npcm7xx.c @@ -17,6 +17,7 @@ #include #include #include +#include #include #include @@ -91,7 +92,6 @@ enum i2c_addr { /* init register and default value required to enable module */ #define NPCM_I2CSEGCTL 0xE4 -#define NPCM_I2CSEGCTL_INIT_VAL 0x0333F000 /* Common regs */ #define NPCM_I2CSDA 0x00 @@ -228,8 +228,7 @@ static const int npcm_i2caddr[I2C_NUM_OWN_ADDR] = { #define NPCM_I2CFIF_CTS_CLR_FIFO BIT(6) #define NPCM_I2CFIF_CTS_SLVRSTR BIT(7) -/* NPCM_I2CTXF_CTL reg fields */ -#define NPCM_I2CTXF_CTL_TX_THR GENMASK(4, 0) +/* NPCM_I2CTXF_CTL reg field */ #define NPCM_I2CTXF_CTL_THR_TXIE BIT(6) /* NPCM_I2CT_OUT reg fields */ @@ -238,22 +237,18 @@ static const int npcm_i2caddr[I2C_NUM_OWN_ADDR] = { #define NPCM_I2CT_OUT_T_OUTST BIT(7) /* NPCM_I2CTXF_STS reg fields */ -#define NPCM_I2CTXF_STS_TX_BYTES GENMASK(4, 0) #define NPCM_I2CTXF_STS_TX_THST BIT(6) /* NPCM_I2CRXF_STS reg fields */ -#define NPCM_I2CRXF_STS_RX_BYTES GENMASK(4, 0) #define NPCM_I2CRXF_STS_RX_THST BIT(6) /* NPCM_I2CFIF_CTL reg fields */ #define NPCM_I2CFIF_CTL_FIFO_EN BIT(4) /* NPCM_I2CRXF_CTL reg fields */ -#define NPCM_I2CRXF_CTL_RX_THR GENMASK(4, 0) -#define NPCM_I2CRXF_CTL_LAST_PEC BIT(5) #define NPCM_I2CRXF_CTL_THR_RXIE BIT(6) -#define I2C_HW_FIFO_SIZE 16 +#define MAX_I2C_HW_FIFO_SIZE 32 /* I2C_VER reg fields */ #define I2C_VER_VERSION GENMASK(6, 0) @@ -270,11 +265,36 @@ static const int npcm_i2caddr[I2C_NUM_OWN_ADDR] = { #define I2C_FREQ_MIN_HZ 10000 #define I2C_FREQ_MAX_HZ I2C_MAX_FAST_MODE_PLUS_FREQ +struct npcm_i2c_data { + u8 fifo_size; + u32 segctl_init_val; + u8 txf_sts_tx_bytes; + u8 rxf_sts_rx_bytes; + u8 rxf_ctl_last_pec; +}; + +static const struct npcm_i2c_data npxm7xx_i2c_data = { + .fifo_size = 16, + .segctl_init_val = 0x0333F000, + .txf_sts_tx_bytes = GENMASK(4, 0), + .rxf_sts_rx_bytes = GENMASK(4, 0), + .rxf_ctl_last_pec = BIT(5), +}; + +static const struct npcm_i2c_data npxm8xx_i2c_data = { + .fifo_size = 32, + .segctl_init_val = 0x9333F000, + .txf_sts_tx_bytes = GENMASK(5, 0), + .rxf_sts_rx_bytes = GENMASK(5, 0), + .rxf_ctl_last_pec = BIT(7), +}; + /* Status of one I2C module */ struct npcm_i2c { struct i2c_adapter adap; struct device *dev; unsigned char __iomem *reg; + const struct npcm_i2c_data *data; spinlock_t lock; /* IRQ synchronization */ struct completion cmd_complete; int cmd_err; @@ -307,8 +327,8 @@ struct npcm_i2c { int slv_rd_ind; int slv_wr_size; int slv_wr_ind; - u8 slv_rd_buf[I2C_HW_FIFO_SIZE]; - u8 slv_wr_buf[I2C_HW_FIFO_SIZE]; + u8 slv_rd_buf[MAX_I2C_HW_FIFO_SIZE]; + u8 slv_wr_buf[MAX_I2C_HW_FIFO_SIZE]; #endif struct dentry *debugfs; /* debugfs device directory */ u64 ber_cnt; @@ -441,7 +461,7 @@ static inline bool npcm_i2c_tx_fifo_empty(struct npcm_i2c *bus) tx_fifo_sts = ioread8(bus->reg + NPCM_I2CTXF_STS); /* check if TX FIFO is not empty */ - if ((tx_fifo_sts & NPCM_I2CTXF_STS_TX_BYTES) == 0) + if ((tx_fifo_sts & bus->data->txf_sts_tx_bytes) == 0) return false; /* check if TX FIFO status bit is set: */ @@ -454,7 +474,7 @@ static inline bool npcm_i2c_rx_fifo_full(struct npcm_i2c *bus) rx_fifo_sts = ioread8(bus->reg + NPCM_I2CRXF_STS); /* check if RX FIFO is not empty: */ - if ((rx_fifo_sts & NPCM_I2CRXF_STS_RX_BYTES) == 0) + if ((rx_fifo_sts & bus->data->rxf_sts_rx_bytes) == 0) return false; /* check if rx fifo full status is set: */ @@ -743,11 +763,11 @@ static void npcm_i2c_callback(struct npcm_i2c *bus, static u8 npcm_i2c_fifo_usage(struct npcm_i2c *bus) { if (bus->operation == I2C_WRITE_OPER) - return FIELD_GET(NPCM_I2CTXF_STS_TX_BYTES, - ioread8(bus->reg + NPCM_I2CTXF_STS)); + return (bus->data->txf_sts_tx_bytes & + ioread8(bus->reg + NPCM_I2CTXF_STS)); if (bus->operation == I2C_READ_OPER) - return FIELD_GET(NPCM_I2CRXF_STS_RX_BYTES, - ioread8(bus->reg + NPCM_I2CRXF_STS)); + return (bus->data->rxf_sts_rx_bytes & + ioread8(bus->reg + NPCM_I2CRXF_STS)); return 0; } @@ -759,13 +779,13 @@ static void npcm_i2c_write_to_fifo_master(struct npcm_i2c *bus, u16 max_bytes) * Fill the FIFO, while the FIFO is not full and there are more bytes * to write */ - size_free_fifo = I2C_HW_FIFO_SIZE - npcm_i2c_fifo_usage(bus); + size_free_fifo = bus->data->fifo_size - npcm_i2c_fifo_usage(bus); while (max_bytes-- && size_free_fifo) { if (bus->wr_ind < bus->wr_size) npcm_i2c_wr_byte(bus, bus->wr_buf[bus->wr_ind++]); else npcm_i2c_wr_byte(bus, 0xFF); - size_free_fifo = I2C_HW_FIFO_SIZE - npcm_i2c_fifo_usage(bus); + size_free_fifo = bus->data->fifo_size - npcm_i2c_fifo_usage(bus); } } @@ -786,11 +806,11 @@ static void npcm_i2c_set_fifo(struct npcm_i2c *bus, int nread, int nwrite) /* configure RX FIFO */ if (nread > 0) { - rxf_ctl = min_t(int, nread, I2C_HW_FIFO_SIZE); + rxf_ctl = min_t(int, nread, bus->data->fifo_size); /* set LAST bit. if LAST is set next FIFO packet is nacked */ - if (nread <= I2C_HW_FIFO_SIZE) - rxf_ctl |= NPCM_I2CRXF_CTL_LAST_PEC; + if (nread <= bus->data->fifo_size) + rxf_ctl |= bus->data->rxf_ctl_last_pec; /* * if we are about to read the first byte in blk rd mode, @@ -808,9 +828,9 @@ static void npcm_i2c_set_fifo(struct npcm_i2c *bus, int nread, int nwrite) /* configure TX FIFO */ if (nwrite > 0) { - if (nwrite > I2C_HW_FIFO_SIZE) + if (nwrite > bus->data->fifo_size) /* data to send is more then FIFO size. */ - iowrite8(I2C_HW_FIFO_SIZE, bus->reg + NPCM_I2CTXF_CTL); + iowrite8(bus->data->fifo_size, bus->reg + NPCM_I2CTXF_CTL); else iowrite8(nwrite, bus->reg + NPCM_I2CTXF_CTL); @@ -879,13 +899,13 @@ static void npcm_i2c_write_fifo_slave(struct npcm_i2c *bus, u16 max_bytes) npcm_i2c_clear_fifo_int(bus); npcm_i2c_clear_tx_fifo(bus); iowrite8(0, bus->reg + NPCM_I2CTXF_CTL); - while (max_bytes-- && I2C_HW_FIFO_SIZE != npcm_i2c_fifo_usage(bus)) { + while (max_bytes-- && bus->data->fifo_size != npcm_i2c_fifo_usage(bus)) { if (bus->slv_wr_size <= 0) break; - bus->slv_wr_ind = bus->slv_wr_ind % I2C_HW_FIFO_SIZE; + bus->slv_wr_ind = bus->slv_wr_ind & (bus->data->fifo_size - 1); npcm_i2c_wr_byte(bus, bus->slv_wr_buf[bus->slv_wr_ind]); bus->slv_wr_ind++; - bus->slv_wr_ind = bus->slv_wr_ind % I2C_HW_FIFO_SIZE; + bus->slv_wr_ind = bus->slv_wr_ind & (bus->data->fifo_size - 1); bus->slv_wr_size--; } } @@ -900,7 +920,7 @@ static void npcm_i2c_read_fifo_slave(struct npcm_i2c *bus, u8 bytes_in_fifo) while (bytes_in_fifo--) { data = npcm_i2c_rd_byte(bus); - bus->slv_rd_ind = bus->slv_rd_ind % I2C_HW_FIFO_SIZE; + bus->slv_rd_ind = bus->slv_rd_ind & (bus->data->fifo_size - 1); bus->slv_rd_buf[bus->slv_rd_ind] = data; bus->slv_rd_ind++; @@ -918,8 +938,8 @@ static int npcm_i2c_slave_get_wr_buf(struct npcm_i2c *bus) int ret = bus->slv_wr_ind; /* fill a cyclic buffer */ - for (i = 0; i < I2C_HW_FIFO_SIZE; i++) { - if (bus->slv_wr_size >= I2C_HW_FIFO_SIZE) + for (i = 0; i < bus->data->fifo_size; i++) { + if (bus->slv_wr_size >= bus->data->fifo_size) break; if (bus->state == I2C_SLAVE_MATCH) { i2c_slave_event(bus->slave, I2C_SLAVE_READ_REQUESTED, &value); @@ -927,11 +947,11 @@ static int npcm_i2c_slave_get_wr_buf(struct npcm_i2c *bus) } else { i2c_slave_event(bus->slave, I2C_SLAVE_READ_PROCESSED, &value); } - ind = (bus->slv_wr_ind + bus->slv_wr_size) % I2C_HW_FIFO_SIZE; + ind = (bus->slv_wr_ind + bus->slv_wr_size) & (bus->data->fifo_size - 1); bus->slv_wr_buf[ind] = value; bus->slv_wr_size++; } - return I2C_HW_FIFO_SIZE - ret; + return bus->data->fifo_size - ret; } static void npcm_i2c_slave_send_rd_buf(struct npcm_i2c *bus) @@ -966,7 +986,7 @@ static void npcm_i2c_slave_receive(struct npcm_i2c *bus, u16 nread, bus->slv_rd_ind = 0; iowrite8(0, bus->reg + NPCM_I2CTXF_CTL); - iowrite8(I2C_HW_FIFO_SIZE, bus->reg + NPCM_I2CRXF_CTL); + iowrite8(bus->data->fifo_size, bus->reg + NPCM_I2CRXF_CTL); npcm_i2c_clear_tx_fifo(bus); npcm_i2c_clear_rx_fifo(bus); } @@ -999,12 +1019,12 @@ static void npcm_i2c_slave_wr_buf_sync(struct npcm_i2c *bus) { int left_in_fifo; - left_in_fifo = FIELD_GET(NPCM_I2CTXF_STS_TX_BYTES, - ioread8(bus->reg + NPCM_I2CTXF_STS)); + left_in_fifo = bus->data->txf_sts_tx_bytes & + ioread8(bus->reg + NPCM_I2CTXF_STS); /* fifo already full: */ - if (left_in_fifo >= I2C_HW_FIFO_SIZE || - bus->slv_wr_size >= I2C_HW_FIFO_SIZE) + if (left_in_fifo >= bus->data->fifo_size || + bus->slv_wr_size >= bus->data->fifo_size) return; /* update the wr fifo index back to the untransmitted bytes: */ @@ -1012,7 +1032,7 @@ static void npcm_i2c_slave_wr_buf_sync(struct npcm_i2c *bus) bus->slv_wr_size = bus->slv_wr_size + left_in_fifo; if (bus->slv_wr_ind < 0) - bus->slv_wr_ind += I2C_HW_FIFO_SIZE; + bus->slv_wr_ind += bus->data->fifo_size; } static void npcm_i2c_slave_rd_wr(struct npcm_i2c *bus) @@ -1158,7 +1178,7 @@ static irqreturn_t npcm_i2c_int_slave_handler(struct npcm_i2c *bus) npcm_i2c_clear_rx_fifo(bus); npcm_i2c_clear_tx_fifo(bus); iowrite8(0, bus->reg + NPCM_I2CTXF_CTL); - iowrite8(I2C_HW_FIFO_SIZE, bus->reg + NPCM_I2CRXF_CTL); + iowrite8(bus->data->fifo_size, bus->reg + NPCM_I2CRXF_CTL); if (NPCM_I2CST_XMIT & i2cst) { bus->operation = I2C_WRITE_OPER; } else { @@ -1319,8 +1339,8 @@ static void npcm_i2c_master_fifo_read(struct npcm_i2c *bus) * read == FIFO Size + C (where C < FIFO Size)then first read C bytes * and in the next int we read rest of the data. */ - if (rcount < (2 * I2C_HW_FIFO_SIZE) && rcount > I2C_HW_FIFO_SIZE) - fifo_bytes = rcount - I2C_HW_FIFO_SIZE; + if (rcount < (2 * bus->data->fifo_size) && rcount > bus->data->fifo_size) + fifo_bytes = rcount - bus->data->fifo_size; if (rcount <= fifo_bytes) { /* last bytes are about to be read - end of tx */ @@ -2200,7 +2220,7 @@ static int npcm_i2c_master_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, * It cannot be cleared without resetting the module. */ else if (bus->cmd_err && - (NPCM_I2CRXF_CTL_LAST_PEC & ioread8(bus->reg + NPCM_I2CRXF_CTL))) + (bus->data->rxf_ctl_last_pec & ioread8(bus->reg + NPCM_I2CRXF_CTL))) npcm_i2c_reset(bus); /* after any xfer, successful or not, stall and EOB must be disabled */ @@ -2271,6 +2291,7 @@ static int npcm_i2c_probe_bus(struct platform_device *pdev) struct i2c_adapter *adap; struct clk *i2c_clk; static struct regmap *gcr_regmap; + struct device *dev = &pdev->dev; int irq; int ret; struct device_node *np = pdev->dev.of_node; @@ -2281,6 +2302,12 @@ static int npcm_i2c_probe_bus(struct platform_device *pdev) bus->dev = &pdev->dev; + bus->data = of_device_get_match_data(dev); + if (!bus->data) { + dev_err(dev, "OF data missing\n"); + return -EINVAL; + } + bus->num = of_alias_get_id(pdev->dev.of_node, "i2c"); /* core clk must be acquired to calculate module timing settings */ i2c_clk = devm_clk_get(&pdev->dev, NULL); @@ -2294,7 +2321,7 @@ static int npcm_i2c_probe_bus(struct platform_device *pdev) if (IS_ERR(gcr_regmap)) return PTR_ERR(gcr_regmap); - regmap_write(gcr_regmap, NPCM_I2CSEGCTL, NPCM_I2CSEGCTL_INIT_VAL); + regmap_write(gcr_regmap, NPCM_I2CSEGCTL, bus->data->segctl_init_val); bus->reg = devm_platform_ioremap_resource(pdev, 0); if (IS_ERR(bus->reg)) @@ -2356,7 +2383,8 @@ static int npcm_i2c_remove_bus(struct platform_device *pdev) } static const struct of_device_id npcm_i2c_bus_of_table[] = { - { .compatible = "nuvoton,npcm750-i2c", }, + { .compatible = "nuvoton,npcm750-i2c", .data = &npxm7xx_i2c_data }, + { .compatible = "nuvoton,npcm845-i2c", .data = &npxm8xx_i2c_data }, {} }; MODULE_DEVICE_TABLE(of, npcm_i2c_bus_of_table);