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Thu, 16 May 2024 18:19:15 +0000 (GMT) From: Eddie James To: linux-fsi@lists.ozlabs.org Subject: [PATCH v3 27/40] i2c: fsi: Improve formatting Date: Thu, 16 May 2024 13:18:54 -0500 Message-Id: <20240516181907.3468796-28-eajames@linux.ibm.com> X-Mailer: git-send-email 2.39.3 In-Reply-To: <20240516181907.3468796-1-eajames@linux.ibm.com> References: <20240516181907.3468796-1-eajames@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: aqRpYjFwElhVD6tKl4zd51PHoqBqm-2N X-Proofpoint-ORIG-GUID: aqRpYjFwElhVD6tKl4zd51PHoqBqm-2N X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1039,Hydra:6.0.650,FMLib:17.11.176.26 definitions=2024-05-16_07,2024-05-15_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxlogscore=999 phishscore=0 adultscore=0 priorityscore=1501 malwarescore=0 suspectscore=0 bulkscore=0 mlxscore=0 spamscore=0 lowpriorityscore=0 impostorscore=0 clxscore=1015 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2405010000 definitions=main-2405160132 X-BeenThere: linux-fsi@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: andi.shyti@kernel.org, linux-aspeed@lists.ozlabs.org, alistair@popple.id.au, linux-kernel@vger.kernel.org, linux-spi@vger.kernel.org, broonie@kernel.org, andrew@codeconstruct.com.au, linux-i2c@vger.kernel.org Errors-To: linux-fsi-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org Sender: "linux-fsi" No functional change. Remove holes in the master structure. Re-order local variables to look pretty. Remove some local variables in favor of using their containing structure. Signed-off-by: Eddie James --- Changes since v2: - Add detail to commit message. drivers/i2c/busses/i2c-fsi.c | 125 +++++++++++++++++------------------ 1 file changed, 60 insertions(+), 65 deletions(-) diff --git a/drivers/i2c/busses/i2c-fsi.c b/drivers/i2c/busses/i2c-fsi.c index 2404ace8c56fa..8fb5b51b74a4d 100644 --- a/drivers/i2c/busses/i2c-fsi.c +++ b/drivers/i2c/busses/i2c-fsi.c @@ -148,10 +148,10 @@ struct fsi_i2c_master { struct fsi_device *fsi; - u8 fifo_size; struct list_head ports; struct mutex lock; u32 clock_div; + u8 fifo_size; }; struct fsi_i2c_port { @@ -165,15 +165,14 @@ struct fsi_i2c_port { static int fsi_i2c_read_reg(struct fsi_device *fsi, unsigned int reg, u32 *data) { - int rc; __be32 data_be; + int rc; rc = fsi_device_read(fsi, reg, &data_be, sizeof(data_be)); if (rc) return rc; *data = be32_to_cpu(data_be); - return 0; } @@ -187,9 +186,11 @@ static int fsi_i2c_write_reg(struct fsi_device *fsi, unsigned int reg, static int fsi_i2c_dev_init(struct fsi_i2c_master *i2c) { - int rc; - u32 mode = I2C_MODE_ENHANCED, extended_status, watermark; + u32 mode = I2C_MODE_ENHANCED; + u32 extended_status; u32 interrupt = 0; + u32 watermark; + int rc; /* since we use polling, disable interrupts */ rc = fsi_i2c_write_reg(i2c->fsi, I2C_FSI_INT_MASK, &interrupt); @@ -215,9 +216,10 @@ static int fsi_i2c_dev_init(struct fsi_i2c_master *i2c) static int fsi_i2c_set_port(struct fsi_i2c_port *port) { - int rc; struct fsi_device *fsi = port->master->fsi; - u32 mode, dummy = 0; + u32 dummy = 0; + u32 mode; + int rc; rc = fsi_i2c_read_reg(fsi, I2C_FSI_MODE, &mode); if (rc) @@ -238,7 +240,6 @@ static int fsi_i2c_set_port(struct fsi_i2c_port *port) static int fsi_i2c_start(struct fsi_i2c_port *port, struct i2c_msg *msg, bool stop) { - struct fsi_i2c_master *i2c = port->master; u32 cmd = I2C_CMD_WITH_START | I2C_CMD_WITH_ADDR; port->xfrd = 0; @@ -252,7 +253,7 @@ static int fsi_i2c_start(struct fsi_i2c_port *port, struct i2c_msg *msg, cmd |= FIELD_PREP(I2C_CMD_ADDR, msg->addr); cmd |= FIELD_PREP(I2C_CMD_LEN, msg->len); - return fsi_i2c_write_reg(i2c->fsi, I2C_FSI_CMD, &cmd); + return fsi_i2c_write_reg(port->master->fsi, I2C_FSI_CMD, &cmd); } static int fsi_i2c_get_op_bytes(int op_bytes) @@ -268,18 +269,17 @@ static int fsi_i2c_get_op_bytes(int op_bytes) static int fsi_i2c_write_fifo(struct fsi_i2c_port *port, struct i2c_msg *msg, u8 fifo_count) { + int bytes_to_write = port->master->fifo_size - fifo_count; + int bytes_remaining = msg->len - port->xfrd; int write; int rc; - struct fsi_i2c_master *i2c = port->master; - int bytes_to_write = i2c->fifo_size - fifo_count; - int bytes_remaining = msg->len - port->xfrd; bytes_to_write = min(bytes_to_write, bytes_remaining); while (bytes_to_write) { write = fsi_i2c_get_op_bytes(bytes_to_write); - rc = fsi_device_write(i2c->fsi, I2C_FSI_FIFO, + rc = fsi_device_write(port->master->fsi, I2C_FSI_FIFO, &msg->buf[port->xfrd], write); if (rc) return rc; @@ -294,12 +294,11 @@ static int fsi_i2c_write_fifo(struct fsi_i2c_port *port, struct i2c_msg *msg, static int fsi_i2c_read_fifo(struct fsi_i2c_port *port, struct i2c_msg *msg, u8 fifo_count) { - int read; - int rc; - struct fsi_i2c_master *i2c = port->master; - int bytes_to_read; int xfr_remaining = msg->len - port->xfrd; + int bytes_to_read; u32 dummy; + int read; + int rc; bytes_to_read = min_t(int, fifo_count, xfr_remaining); @@ -307,7 +306,7 @@ static int fsi_i2c_read_fifo(struct fsi_i2c_port *port, struct i2c_msg *msg, read = fsi_i2c_get_op_bytes(bytes_to_read); if (xfr_remaining) { - rc = fsi_device_read(i2c->fsi, I2C_FSI_FIFO, + rc = fsi_device_read(port->master->fsi, I2C_FSI_FIFO, &msg->buf[port->xfrd], read); if (rc) return rc; @@ -316,8 +315,8 @@ static int fsi_i2c_read_fifo(struct fsi_i2c_port *port, struct i2c_msg *msg, xfr_remaining -= read; } else { /* no more buffer but data in fifo, need to clear it */ - rc = fsi_device_read(i2c->fsi, I2C_FSI_FIFO, &dummy, - read); + rc = fsi_device_read(port->master->fsi, I2C_FSI_FIFO, + &dummy, read); if (rc) return rc; } @@ -330,85 +329,80 @@ static int fsi_i2c_read_fifo(struct fsi_i2c_port *port, struct i2c_msg *msg, static int fsi_i2c_get_scl(struct i2c_adapter *adap) { - u32 stat = 0; struct fsi_i2c_port *port = adap->algo_data; - struct fsi_i2c_master *i2c = port->master; + u32 stat; - fsi_i2c_read_reg(i2c->fsi, I2C_FSI_STAT, &stat); + fsi_i2c_read_reg(port->master->fsi, I2C_FSI_STAT, &stat); return !!(stat & I2C_STAT_SCL_IN); } static void fsi_i2c_set_scl(struct i2c_adapter *adap, int val) { - u32 dummy = 0; struct fsi_i2c_port *port = adap->algo_data; - struct fsi_i2c_master *i2c = port->master; + u32 dummy = 0; if (val) - fsi_i2c_write_reg(i2c->fsi, I2C_FSI_SET_SCL, &dummy); + fsi_i2c_write_reg(port->master->fsi, I2C_FSI_SET_SCL, &dummy); else - fsi_i2c_write_reg(i2c->fsi, I2C_FSI_RESET_SCL, &dummy); + fsi_i2c_write_reg(port->master->fsi, I2C_FSI_RESET_SCL, &dummy); } static int fsi_i2c_get_sda(struct i2c_adapter *adap) { - u32 stat = 0; struct fsi_i2c_port *port = adap->algo_data; - struct fsi_i2c_master *i2c = port->master; + u32 stat; - fsi_i2c_read_reg(i2c->fsi, I2C_FSI_STAT, &stat); + fsi_i2c_read_reg(port->master->fsi, I2C_FSI_STAT, &stat); return !!(stat & I2C_STAT_SDA_IN); } static void fsi_i2c_set_sda(struct i2c_adapter *adap, int val) { - u32 dummy = 0; struct fsi_i2c_port *port = adap->algo_data; - struct fsi_i2c_master *i2c = port->master; + u32 dummy = 0; if (val) - fsi_i2c_write_reg(i2c->fsi, I2C_FSI_SET_SDA, &dummy); + fsi_i2c_write_reg(port->master->fsi, I2C_FSI_SET_SDA, &dummy); else - fsi_i2c_write_reg(i2c->fsi, I2C_FSI_RESET_SDA, &dummy); + fsi_i2c_write_reg(port->master->fsi, I2C_FSI_RESET_SDA, &dummy); } static void fsi_i2c_prepare_recovery(struct i2c_adapter *adap) { - int rc; - u32 mode; struct fsi_i2c_port *port = adap->algo_data; - struct fsi_i2c_master *i2c = port->master; + u32 mode; + int rc; - rc = fsi_i2c_read_reg(i2c->fsi, I2C_FSI_MODE, &mode); + rc = fsi_i2c_read_reg(port->master->fsi, I2C_FSI_MODE, &mode); if (rc) return; mode |= I2C_MODE_DIAG; - fsi_i2c_write_reg(i2c->fsi, I2C_FSI_MODE, &mode); + fsi_i2c_write_reg(port->master->fsi, I2C_FSI_MODE, &mode); } static void fsi_i2c_unprepare_recovery(struct i2c_adapter *adap) { - int rc; - u32 mode; struct fsi_i2c_port *port = adap->algo_data; - struct fsi_i2c_master *i2c = port->master; + u32 mode; + int rc; - rc = fsi_i2c_read_reg(i2c->fsi, I2C_FSI_MODE, &mode); + rc = fsi_i2c_read_reg(port->master->fsi, I2C_FSI_MODE, &mode); if (rc) return; mode &= ~I2C_MODE_DIAG; - fsi_i2c_write_reg(i2c->fsi, I2C_FSI_MODE, &mode); + fsi_i2c_write_reg(port->master->fsi, I2C_FSI_MODE, &mode); } static int fsi_i2c_reset_bus(struct fsi_i2c_master *i2c, struct fsi_i2c_port *port) { + u32 dummy = 0; + u32 stat; int rc; - u32 stat, dummy = 0; /* force bus reset, ignore errors */ i2c_recover_bus(&port->adapter); @@ -439,8 +433,9 @@ static int fsi_i2c_reset_bus(struct fsi_i2c_master *i2c, static int fsi_i2c_reset_engine(struct fsi_i2c_master *i2c, u16 port) { + u32 dummy = 0; + u32 mode; int rc; - u32 mode, dummy = 0; /* reset engine */ rc = fsi_i2c_write_reg(i2c->fsi, I2C_FSI_RESET_I2C, &dummy); @@ -476,18 +471,17 @@ static int fsi_i2c_reset_engine(struct fsi_i2c_master *i2c, u16 port) static int fsi_i2c_abort(struct fsi_i2c_port *port, u32 status) { - int rc; - unsigned long start; + struct fsi_i2c_master *i2c = port->master; u32 cmd = I2C_CMD_WITH_STOP; + unsigned long start; u32 stat; - struct fsi_i2c_master *i2c = port->master; - struct fsi_device *fsi = i2c->fsi; + int rc; rc = fsi_i2c_reset_engine(i2c, port->port); if (rc) return rc; - rc = fsi_i2c_read_reg(fsi, I2C_FSI_STAT, &stat); + rc = fsi_i2c_read_reg(i2c->fsi, I2C_FSI_STAT, &stat); if (rc) return rc; @@ -503,15 +497,14 @@ static int fsi_i2c_abort(struct fsi_i2c_port *port, u32 status) return 0; /* write stop command */ - rc = fsi_i2c_write_reg(fsi, I2C_FSI_CMD, &cmd); + rc = fsi_i2c_write_reg(i2c->fsi, I2C_FSI_CMD, &cmd); if (rc) return rc; /* wait until we see command complete in the master */ start = jiffies; - do { - rc = fsi_i2c_read_reg(fsi, I2C_FSI_STAT, &status); + rc = fsi_i2c_read_reg(i2c->fsi, I2C_FSI_STAT, &status); if (rc) return rc; @@ -527,8 +520,8 @@ static int fsi_i2c_abort(struct fsi_i2c_port *port, u32 status) static int fsi_i2c_handle_status(struct fsi_i2c_port *port, struct i2c_msg *msg, u32 status) { - int rc; u8 fifo_count; + int rc; if (status & I2C_STAT_ERR) { rc = fsi_i2c_abort(port, status); @@ -576,9 +569,9 @@ static int fsi_i2c_handle_status(struct fsi_i2c_port *port, static int fsi_i2c_wait(struct fsi_i2c_port *port, struct i2c_msg *msg, unsigned long timeout) { - u32 status = 0; - int rc; unsigned long start = jiffies; + u32 status; + int rc; do { rc = fsi_i2c_read_reg(port->master->fsi, I2C_FSI_STAT, @@ -608,13 +601,13 @@ static int fsi_i2c_wait(struct fsi_i2c_port *port, struct i2c_msg *msg, static int fsi_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num) { - int i, rc; - unsigned long start_time; struct fsi_i2c_port *port = adap->algo_data; - struct fsi_i2c_master *master = port->master; + unsigned long start_time; struct i2c_msg *msg; + int rc; + int i; - mutex_lock(&master->lock); + mutex_lock(&port->master->lock); rc = fsi_i2c_set_port(port); if (rc) @@ -635,7 +628,7 @@ static int fsi_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, } unlock: - mutex_unlock(&master->lock); + mutex_unlock(&port->master->lock); return rc ? : num; } @@ -681,8 +674,10 @@ static int fsi_i2c_probe(struct device *dev) struct fsi_i2c_master *i2c; struct fsi_i2c_port *port; struct device_node *np; - u32 port_no, ports, stat; + u32 port_no; + u32 ports; u32 lbus; + u32 stat; int rc; i2c = devm_kzalloc(dev, sizeof(*i2c), GFP_KERNEL); @@ -752,14 +747,14 @@ static int fsi_i2c_probe(struct device *dev) } dev_set_drvdata(dev, i2c); - return 0; } static int fsi_i2c_remove(struct device *dev) { struct fsi_i2c_master *i2c = dev_get_drvdata(dev); - struct fsi_i2c_port *port, *tmp; + struct fsi_i2c_port *port; + struct fsi_i2c_port *tmp; list_for_each_entry_safe(port, tmp, &i2c->ports, list) { list_del(&port->list);