| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Alexander Shiyan | 5285 | 68.02% | 20 | 18.52% |
| Cosmin Tanislav | 609 | 7.84% | 4 | 3.70% |
| Jan Kundrát | 562 | 7.23% | 10 | 9.26% |
| Hugo Villeneuve | 523 | 6.73% | 23 | 21.30% |
| Serge Semin | 247 | 3.18% | 7 | 6.48% |
| Jianwei Yang | 100 | 1.29% | 1 | 0.93% |
| Andy Shevchenko | 95 | 1.22% | 5 | 4.63% |
| Christoph Vogtländer | 82 | 1.06% | 2 | 1.85% |
| Russell King | 66 | 0.85% | 3 | 2.78% |
| Ilpo Järvinen | 45 | 0.58% | 3 | 2.78% |
| Jiri Slaby (SUSE) | 41 | 0.53% | 2 | 1.85% |
| Ricardo Ribalda Delgado | 25 | 0.32% | 1 | 0.93% |
| Paul Gortmaker | 12 | 0.15% | 1 | 0.93% |
| Axel Lin | 8 | 0.10% | 1 | 0.93% |
| Atul Gopinathan | 8 | 0.10% | 1 | 0.93% |
| Alan Cox | 6 | 0.08% | 2 | 1.85% |
| Linus Torvalds (pre-git) | 6 | 0.08% | 2 | 1.85% |
| Jiri Slaby | 5 | 0.06% | 1 | 0.93% |
| Uwe Kleine-König | 5 | 0.06% | 4 | 3.70% |
| Joe Burmeister | 5 | 0.06% | 1 | 0.93% |
| Linus Walleij | 5 | 0.06% | 1 | 0.93% |
| Gustavo A. R. Silva | 5 | 0.06% | 1 | 0.93% |
| Aditya Pakki | 4 | 0.05% | 1 | 0.93% |
| Lars-Peter Clausen | 4 | 0.05% | 1 | 0.93% |
| Greg Kroah-Hartman | 3 | 0.04% | 3 | 2.78% |
| Kangjie Lu | 3 | 0.04% | 1 | 0.93% |
| Geert Uytterhoeven | 3 | 0.04% | 1 | 0.93% |
| Peter Hurley | 2 | 0.03% | 1 | 0.93% |
| wangkaiyuan | 2 | 0.03% | 1 | 0.93% |
| Emil Goode | 2 | 0.03% | 1 | 0.93% |
| kbuild test robot | 1 | 0.01% | 1 | 0.93% |
| Gregory Hermant | 1 | 0.01% | 1 | 0.93% |
| Total | 7770 | 108 |
// SPDX-License-Identifier: GPL-2.0+ /* * Maxim (Dallas) MAX3107/8/9, MAX14830 serial driver * * Copyright (C) 2012-2016 Alexander Shiyan <shc_work@mail.ru> * * Based on max3100.c, by Christian Pellegrin <chripell@evolware.org> * Based on max3110.c, by Feng Tang <feng.tang@intel.com> * Based on max3107.c, by Aavamobile */ #include <linux/bitops.h> #include <linux/clk.h> #include <linux/delay.h> #include <linux/device.h> #include <linux/gpio/driver.h> #include <linux/i2c.h> #include <linux/module.h> #include <linux/mod_devicetable.h> #include <linux/property.h> #include <linux/regmap.h> #include <linux/serial_core.h> #include <linux/serial.h> #include <linux/tty.h> #include <linux/tty_flip.h> #include <linux/spi/spi.h> #include <linux/uaccess.h> #define MAX310X_NAME "max310x" #define MAX310X_MAJOR 204 #define MAX310X_MINOR 209 #define MAX310X_UART_NRMAX 16 #define MAX310X_MAX_PORTS 4 /* Maximum number of UART ports per IC. */ /* MAX310X register definitions */ #define MAX310X_RHR_REG (0x00) /* RX FIFO */ #define MAX310X_THR_REG (0x00) /* TX FIFO */ #define MAX310X_IRQEN_REG (0x01) /* IRQ enable */ #define MAX310X_IRQSTS_REG (0x02) /* IRQ status */ #define MAX310X_LSR_IRQEN_REG (0x03) /* LSR IRQ enable */ #define MAX310X_LSR_IRQSTS_REG (0x04) /* LSR IRQ status */ #define MAX310X_REG_05 (0x05) #define MAX310X_SPCHR_IRQEN_REG MAX310X_REG_05 /* Special char IRQ en */ #define MAX310X_SPCHR_IRQSTS_REG (0x06) /* Special char IRQ status */ #define MAX310X_STS_IRQEN_REG (0x07) /* Status IRQ enable */ #define MAX310X_STS_IRQSTS_REG (0x08) /* Status IRQ status */ #define MAX310X_MODE1_REG (0x09) /* MODE1 */ #define MAX310X_MODE2_REG (0x0a) /* MODE2 */ #define MAX310X_LCR_REG (0x0b) /* LCR */ #define MAX310X_RXTO_REG (0x0c) /* RX timeout */ #define MAX310X_HDPIXDELAY_REG (0x0d) /* Auto transceiver delays */ #define MAX310X_IRDA_REG (0x0e) /* IRDA settings */ #define MAX310X_FLOWLVL_REG (0x0f) /* Flow control levels */ #define MAX310X_FIFOTRIGLVL_REG (0x10) /* FIFO IRQ trigger levels */ #define MAX310X_TXFIFOLVL_REG (0x11) /* TX FIFO level */ #define MAX310X_RXFIFOLVL_REG (0x12) /* RX FIFO level */ #define MAX310X_FLOWCTRL_REG (0x13) /* Flow control */ #define MAX310X_XON1_REG (0x14) /* XON1 character */ #define MAX310X_XON2_REG (0x15) /* XON2 character */ #define MAX310X_XOFF1_REG (0x16) /* XOFF1 character */ #define MAX310X_XOFF2_REG (0x17) /* XOFF2 character */ #define MAX310X_GPIOCFG_REG (0x18) /* GPIO config */ #define MAX310X_GPIODATA_REG (0x19) /* GPIO data */ #define MAX310X_PLLCFG_REG (0x1a) /* PLL config */ #define MAX310X_BRGCFG_REG (0x1b) /* Baud rate generator conf */ #define MAX310X_BRGDIVLSB_REG (0x1c) /* Baud rate divisor LSB */ #define MAX310X_BRGDIVMSB_REG (0x1d) /* Baud rate divisor MSB */ #define MAX310X_CLKSRC_REG (0x1e) /* Clock source */ #define MAX310X_REG_1F (0x1f) #define MAX310X_EXTREG_START (0x20) /* Only relevant in SPI mode. */ #define MAX310X_REVID_REG MAX310X_REG_1F /* Revision ID */ #define MAX310X_GLOBALIRQ_REG MAX310X_REG_1F /* Global IRQ (RO) */ #define MAX310X_GLOBALCMD_REG MAX310X_REG_1F /* Global Command (WO) */ /* Extended registers */ #define MAX310X_REVID_EXTREG (0x25) /* Revision ID * (extended addressing space) */ /* IRQ register bits */ #define MAX310X_IRQ_LSR_BIT (1 << 0) /* LSR interrupt */ #define MAX310X_IRQ_SPCHR_BIT (1 << 1) /* Special char interrupt */ #define MAX310X_IRQ_STS_BIT (1 << 2) /* Status interrupt */ #define MAX310X_IRQ_RXFIFO_BIT (1 << 3) /* RX FIFO interrupt */ #define MAX310X_IRQ_TXFIFO_BIT (1 << 4) /* TX FIFO interrupt */ #define MAX310X_IRQ_TXEMPTY_BIT (1 << 5) /* TX FIFO empty interrupt */ #define MAX310X_IRQ_RXEMPTY_BIT (1 << 6) /* RX FIFO empty interrupt */ #define MAX310X_IRQ_CTS_BIT (1 << 7) /* CTS interrupt */ /* LSR register bits */ #define MAX310X_LSR_RXTO_BIT (1 << 0) /* RX timeout */ #define MAX310X_LSR_RXOVR_BIT (1 << 1) /* RX overrun */ #define MAX310X_LSR_RXPAR_BIT (1 << 2) /* RX parity error */ #define MAX310X_LSR_FRERR_BIT (1 << 3) /* Frame error */ #define MAX310X_LSR_RXBRK_BIT (1 << 4) /* RX break */ #define MAX310X_LSR_RXNOISE_BIT (1 << 5) /* RX noise */ #define MAX310X_LSR_CTS_BIT (1 << 7) /* CTS pin state */ /* Special character register bits */ #define MAX310X_SPCHR_XON1_BIT (1 << 0) /* XON1 character */ #define MAX310X_SPCHR_XON2_BIT (1 << 1) /* XON2 character */ #define MAX310X_SPCHR_XOFF1_BIT (1 << 2) /* XOFF1 character */ #define MAX310X_SPCHR_XOFF2_BIT (1 << 3) /* XOFF2 character */ #define MAX310X_SPCHR_BREAK_BIT (1 << 4) /* RX break */ #define MAX310X_SPCHR_MULTIDROP_BIT (1 << 5) /* 9-bit multidrop addr char */ /* Status register bits */ #define MAX310X_STS_GPIO0_BIT (1 << 0) /* GPIO 0 interrupt */ #define MAX310X_STS_GPIO1_BIT (1 << 1) /* GPIO 1 interrupt */ #define MAX310X_STS_GPIO2_BIT (1 << 2) /* GPIO 2 interrupt */ #define MAX310X_STS_GPIO3_BIT (1 << 3) /* GPIO 3 interrupt */ #define MAX310X_STS_CLKREADY_BIT (1 << 5) /* Clock ready */ #define MAX310X_STS_SLEEP_BIT (1 << 6) /* Sleep interrupt */ /* MODE1 register bits */ #define MAX310X_MODE1_RXDIS_BIT (1 << 0) /* RX disable */ #define MAX310X_MODE1_TXDIS_BIT (1 << 1) /* TX disable */ #define MAX310X_MODE1_TXHIZ_BIT (1 << 2) /* TX pin three-state */ #define MAX310X_MODE1_RTSHIZ_BIT (1 << 3) /* RTS pin three-state */ #define MAX310X_MODE1_TRNSCVCTRL_BIT (1 << 4) /* Transceiver ctrl enable */ #define MAX310X_MODE1_FORCESLEEP_BIT (1 << 5) /* Force sleep mode */ #define MAX310X_MODE1_AUTOSLEEP_BIT (1 << 6) /* Auto sleep enable */ #define MAX310X_MODE1_IRQSEL_BIT (1 << 7) /* IRQ pin enable */ /* MODE2 register bits */ #define MAX310X_MODE2_RST_BIT (1 << 0) /* Chip reset */ #define MAX310X_MODE2_FIFORST_BIT (1 << 1) /* FIFO reset */ #define MAX310X_MODE2_RXTRIGINV_BIT (1 << 2) /* RX FIFO INT invert */ #define MAX310X_MODE2_RXEMPTINV_BIT (1 << 3) /* RX FIFO empty INT invert */ #define MAX310X_MODE2_SPCHR_BIT (1 << 4) /* Special chr detect enable */ #define MAX310X_MODE2_LOOPBACK_BIT (1 << 5) /* Internal loopback enable */ #define MAX310X_MODE2_MULTIDROP_BIT (1 << 6) /* 9-bit multidrop enable */ #define MAX310X_MODE2_ECHOSUPR_BIT (1 << 7) /* ECHO suppression enable */ /* LCR register bits */ #define MAX310X_LCR_LENGTH0_BIT (1 << 0) /* Word length bit 0 */ #define MAX310X_LCR_LENGTH1_BIT (1 << 1) /* Word length bit 1 * * Word length bits table: * 00 -> 5 bit words * 01 -> 6 bit words * 10 -> 7 bit words * 11 -> 8 bit words */ #define MAX310X_LCR_STOPLEN_BIT (1 << 2) /* STOP length bit * * STOP length bit table: * 0 -> 1 stop bit * 1 -> 1-1.5 stop bits if * word length is 5, * 2 stop bits otherwise */ #define MAX310X_LCR_PARITY_BIT (1 << 3) /* Parity bit enable */ #define MAX310X_LCR_EVENPARITY_BIT (1 << 4) /* Even parity bit enable */ #define MAX310X_LCR_FORCEPARITY_BIT (1 << 5) /* 9-bit multidrop parity */ #define MAX310X_LCR_TXBREAK_BIT (1 << 6) /* TX break enable */ #define MAX310X_LCR_RTS_BIT (1 << 7) /* RTS pin control */ /* IRDA register bits */ #define MAX310X_IRDA_IRDAEN_BIT (1 << 0) /* IRDA mode enable */ #define MAX310X_IRDA_SIR_BIT (1 << 1) /* SIR mode enable */ /* Flow control trigger level register masks */ #define MAX310X_FLOWLVL_HALT_MASK GENMASK(3, 0) /* Flow control halt level */ #define MAX310X_FLOWLVL_RES_MASK GENMASK(7, 4) /* Flow control resume level */ #define MAX310X_FLOWLVL_HALT(words) ((words / 8) & 0x0f) #define MAX310X_FLOWLVL_RES(words) (((words / 8) & 0x0f) << 4) /* FIFO interrupt trigger level register masks */ #define MAX310X_FIFOTRIGLVL_TX_MASK GENMASK(3, 0) /* TX FIFO trigger level */ #define MAX310X_FIFOTRIGLVL_RX_MASK GENMASK(7, 4) /* RX FIFO trigger level */ #define MAX310X_FIFOTRIGLVL_TX(words) ((words / 8) & 0x0f) #define MAX310X_FIFOTRIGLVL_RX(words) (((words / 8) & 0x0f) << 4) /* Flow control register bits */ #define MAX310X_FLOWCTRL_AUTORTS_BIT (1 << 0) /* Auto RTS flow ctrl enable */ #define MAX310X_FLOWCTRL_AUTOCTS_BIT (1 << 1) /* Auto CTS flow ctrl enable */ #define MAX310X_FLOWCTRL_GPIADDR_BIT (1 << 2) /* Enables that GPIO inputs * are used in conjunction with * XOFF2 for definition of * special character */ #define MAX310X_FLOWCTRL_SWFLOWEN_BIT (1 << 3) /* Auto SW flow ctrl enable */ #define MAX310X_FLOWCTRL_SWFLOW0_BIT (1 << 4) /* SWFLOW bit 0 */ #define MAX310X_FLOWCTRL_SWFLOW1_BIT (1 << 5) /* SWFLOW bit 1 * * SWFLOW bits 1 & 0 table: * 00 -> no transmitter flow * control * 01 -> receiver compares * XON2 and XOFF2 * and controls * transmitter * 10 -> receiver compares * XON1 and XOFF1 * and controls * transmitter * 11 -> receiver compares * XON1, XON2, XOFF1 and * XOFF2 and controls * transmitter */ #define MAX310X_FLOWCTRL_SWFLOW2_BIT (1 << 6) /* SWFLOW bit 2 */ #define MAX310X_FLOWCTRL_SWFLOW3_BIT (1 << 7) /* SWFLOW bit 3 * * SWFLOW bits 3 & 2 table: * 00 -> no received flow * control * 01 -> transmitter generates * XON2 and XOFF2 * 10 -> transmitter generates * XON1 and XOFF1 * 11 -> transmitter generates * XON1, XON2, XOFF1 and * XOFF2 */ /* PLL configuration register masks */ #define MAX310X_PLLCFG_PREDIV_MASK GENMASK(5, 0) /* PLL predivision value */ #define MAX310X_PLLCFG_PLLFACTOR_MASK GENMASK(7, 6) /* PLL multiplication factor */ /* Baud rate generator configuration register bits */ #define MAX310X_BRGCFG_2XMODE_BIT (1 << 4) /* Double baud rate */ #define MAX310X_BRGCFG_4XMODE_BIT (1 << 5) /* Quadruple baud rate */ /* Clock source register bits */ #define MAX310X_CLKSRC_CRYST_BIT (1 << 1) /* Crystal osc enable */ #define MAX310X_CLKSRC_PLL_BIT (1 << 2) /* PLL enable */ #define MAX310X_CLKSRC_PLLBYP_BIT (1 << 3) /* PLL bypass */ #define MAX310X_CLKSRC_EXTCLK_BIT (1 << 4) /* External clock enable */ #define MAX310X_CLKSRC_CLK2RTS_BIT (1 << 7) /* Baud clk to RTS pin */ /* Global commands */ #define MAX310X_EXTREG_ENBL (0xce) #define MAX310X_EXTREG_DSBL (0xcd) /* Misc definitions */ #define MAX310X_FIFO_SIZE (128) #define MAX310x_REV_MASK GENMASK(7, 3) #define MAX310X_WRITE_BIT 0x80 /* Port startup definitions */ #define MAX310X_PORT_STARTUP_WAIT_RETRIES 20 /* Number of retries */ #define MAX310X_PORT_STARTUP_WAIT_DELAY_MS 10 /* Delay between retries */ /* Crystal-related definitions */ #define MAX310X_XTAL_WAIT_RETRIES 20 /* Number of retries */ #define MAX310X_XTAL_WAIT_DELAY_MS 10 /* Delay between retries */ /* MAX3107 specific */ #define MAX3107_REV_ID (0xa0) /* MAX3109 specific */ #define MAX3109_REV_ID (0xc0) /* MAX14830 specific */ #define MAX14830_BRGCFG_CLKDIS_BIT (1 << 6) /* Clock Disable */ #define MAX14830_REV_ID (0xb0) struct max310x_if_cfg { int (*extended_reg_enable)(struct device *dev, bool enable); u8 rev_id_offset; }; struct max310x_devtype { struct { unsigned short min; unsigned short max; } slave_addr; /* Relevant only in I2C mode. */ int nr; char name[9]; u8 mode1; u8 rev_id_val; u8 rev_id_reg; /* Relevant only if rev_id_val is defined. */ u8 power_reg; /* Register address for power/sleep control. */ u8 power_bit; /* Bit for sleep or power-off mode (active high). */ }; struct max310x_one { struct uart_port port; struct work_struct tx_work; struct work_struct md_work; struct work_struct rs_work; struct regmap *regmap; u8 rx_buf[MAX310X_FIFO_SIZE]; }; #define to_max310x_port(_port) \ container_of(_port, struct max310x_one, port) struct max310x_port { const struct max310x_devtype *devtype; const struct max310x_if_cfg *if_cfg; struct regmap *regmap; struct clk *clk; #ifdef CONFIG_GPIOLIB struct gpio_chip gpio; #endif struct max310x_one p[]; }; static struct uart_driver max310x_uart = { .owner = THIS_MODULE, .driver_name = MAX310X_NAME, .dev_name = "ttyMAX", .major = MAX310X_MAJOR, .minor = MAX310X_MINOR, .nr = MAX310X_UART_NRMAX, }; static DECLARE_BITMAP(max310x_lines, MAX310X_UART_NRMAX); static u8 max310x_port_read(struct uart_port *port, u8 reg) { struct max310x_one *one = to_max310x_port(port); unsigned int val = 0; regmap_read(one->regmap, reg, &val); return val; } static void max310x_port_write(struct uart_port *port, u8 reg, u8 val) { struct max310x_one *one = to_max310x_port(port); regmap_write(one->regmap, reg, val); } static void max310x_port_update(struct uart_port *port, u8 reg, u8 mask, u8 val) { struct max310x_one *one = to_max310x_port(port); regmap_update_bits(one->regmap, reg, mask, val); } static int max310x_detect(struct device *dev) { struct max310x_port *s = dev_get_drvdata(dev); unsigned int val = 0; int ret; /* Check if variant supports REV ID register: */ if (s->devtype->rev_id_val) { u8 rev_id_reg = s->devtype->rev_id_reg; /* Check if REV ID is in extended addressing space: */ if (s->devtype->rev_id_reg >= MAX310X_EXTREG_START) { ret = s->if_cfg->extended_reg_enable(dev, true); if (ret) return ret; /* Adjust REV ID extended addressing space address: */ if (s->if_cfg->rev_id_offset) rev_id_reg -= s->if_cfg->rev_id_offset; } regmap_read(s->regmap, rev_id_reg, &val); if (s->devtype->rev_id_reg >= MAX310X_EXTREG_START) { ret = s->if_cfg->extended_reg_enable(dev, false); if (ret) return ret; } if (((val & MAX310x_REV_MASK) != s->devtype->rev_id_val)) return dev_err_probe(dev, -ENODEV, "%s ID 0x%02x does not match\n", s->devtype->name, val); } else { /* * For variant without REV ID register, just check default value * from clocksource register to make sure everything works. */ ret = regmap_read(s->regmap, MAX310X_CLKSRC_REG, &val); if (ret) return ret; if (val != (MAX310X_CLKSRC_EXTCLK_BIT | MAX310X_CLKSRC_PLLBYP_BIT)) return dev_err_probe(dev, -ENODEV, "%s not present\n", s->devtype->name); } return 0; } static void max310x_power(struct uart_port *port, int on) { struct max310x_port *s = dev_get_drvdata(port->dev); max310x_port_update(port, s->devtype->power_reg, s->devtype->power_bit, on ? 0 : s->devtype->power_bit); if (on) msleep(50); } static const struct max310x_devtype max3107_devtype = { .name = "MAX3107", .nr = 1, .mode1 = MAX310X_MODE1_AUTOSLEEP_BIT | MAX310X_MODE1_IRQSEL_BIT, .rev_id_val = MAX3107_REV_ID, .rev_id_reg = MAX310X_REVID_REG, .power_reg = MAX310X_MODE1_REG, .power_bit = MAX310X_MODE1_FORCESLEEP_BIT, .slave_addr = { .min = 0x2c, .max = 0x2f, }, }; static const struct max310x_devtype max3108_devtype = { .name = "MAX3108", .nr = 1, .mode1 = MAX310X_MODE1_AUTOSLEEP_BIT, .rev_id_val = 0, /* Unsupported. */ .rev_id_reg = 0, /* Irrelevant when rev_id_val is not defined. */ .power_reg = MAX310X_MODE1_REG, .power_bit = MAX310X_MODE1_FORCESLEEP_BIT, .slave_addr = { .min = 0x60, .max = 0x6f, }, }; static const struct max310x_devtype max3109_devtype = { .name = "MAX3109", .nr = 2, .mode1 = MAX310X_MODE1_AUTOSLEEP_BIT, .rev_id_val = MAX3109_REV_ID, .rev_id_reg = MAX310X_REVID_EXTREG, .power_reg = MAX310X_MODE1_REG, .power_bit = MAX310X_MODE1_FORCESLEEP_BIT, .slave_addr = { .min = 0x60, .max = 0x6f, }, }; static const struct max310x_devtype max14830_devtype = { .name = "MAX14830", .nr = 4, .mode1 = MAX310X_MODE1_IRQSEL_BIT, .rev_id_val = MAX14830_REV_ID, .rev_id_reg = MAX310X_REVID_EXTREG, .power_reg = MAX310X_BRGCFG_REG, .power_bit = MAX14830_BRGCFG_CLKDIS_BIT, .slave_addr = { .min = 0x60, .max = 0x6f, }, }; static bool max310x_reg_writeable(struct device *dev, unsigned int reg) { switch (reg) { case MAX310X_IRQSTS_REG: case MAX310X_LSR_IRQSTS_REG: case MAX310X_SPCHR_IRQSTS_REG: case MAX310X_STS_IRQSTS_REG: case MAX310X_TXFIFOLVL_REG: case MAX310X_RXFIFOLVL_REG: return false; default: return true; } } static bool max310x_reg_volatile(struct device *dev, unsigned int reg) { switch (reg) { case MAX310X_RHR_REG: case MAX310X_IRQSTS_REG: case MAX310X_LSR_IRQSTS_REG: case MAX310X_SPCHR_IRQSTS_REG: case MAX310X_STS_IRQSTS_REG: case MAX310X_TXFIFOLVL_REG: case MAX310X_RXFIFOLVL_REG: case MAX310X_GPIODATA_REG: case MAX310X_BRGDIVLSB_REG: case MAX310X_REG_05: case MAX310X_REG_1F: return true; default: return false; } } static bool max310x_reg_precious(struct device *dev, unsigned int reg) { switch (reg) { case MAX310X_RHR_REG: case MAX310X_IRQSTS_REG: case MAX310X_SPCHR_IRQSTS_REG: case MAX310X_STS_IRQSTS_REG: return true; default: return false; } } static bool max310x_reg_noinc(struct device *dev, unsigned int reg) { return reg == MAX310X_RHR_REG; } static int max310x_set_baud(struct uart_port *port, int baud) { unsigned int mode = 0, div = 0, frac = 0, c = 0, F = 0; /* * Calculate the integer divisor first. Select a proper mode * in case if the requested baud is too high for the pre-defined * clocks frequency. */ div = port->uartclk / baud; if (div < 8) { /* Mode x4 */ c = 4; mode = MAX310X_BRGCFG_4XMODE_BIT; } else if (div < 16) { /* Mode x2 */ c = 8; mode = MAX310X_BRGCFG_2XMODE_BIT; } else { c = 16; } /* Calculate the divisor in accordance with the fraction coefficient */ div /= c; F = c*baud; /* Calculate the baud rate fraction */ if (div > 0) frac = (16*(port->uartclk % F)) / F; else div = 1; max310x_port_write(port, MAX310X_BRGDIVMSB_REG, div >> 8); max310x_port_write(port, MAX310X_BRGDIVLSB_REG, div); max310x_port_write(port, MAX310X_BRGCFG_REG, frac | mode); /* Return the actual baud rate we just programmed */ return (16*port->uartclk) / (c*(16*div + frac)); } static int max310x_update_best_err(unsigned long f, long *besterr) { /* Use baudrate 115200 for calculate error */ long err = f % (460800 * 16); if ((*besterr < 0) || (*besterr > err)) { *besterr = err; return 0; } return 1; } static s32 max310x_set_ref_clk(struct device *dev, struct max310x_port *s, unsigned long freq, bool xtal) { unsigned int div, clksrc, pllcfg = 0; long besterr = -1; unsigned long fdiv, fmul, bestfreq = freq; /* First, update error without PLL */ max310x_update_best_err(freq, &besterr); /* Try all possible PLL dividers */ for (div = 1; (div <= 63) && besterr; div++) { fdiv = DIV_ROUND_CLOSEST(freq, div); /* Try multiplier 6 */ fmul = fdiv * 6; if ((fdiv >= 500000) && (fdiv <= 800000)) if (!max310x_update_best_err(fmul, &besterr)) { pllcfg = (0 << 6) | div; bestfreq = fmul; } /* Try multiplier 48 */ fmul = fdiv * 48; if ((fdiv >= 850000) && (fdiv <= 1200000)) if (!max310x_update_best_err(fmul, &besterr)) { pllcfg = (1 << 6) | div; bestfreq = fmul; } /* Try multiplier 96 */ fmul = fdiv * 96; if ((fdiv >= 425000) && (fdiv <= 1000000)) if (!max310x_update_best_err(fmul, &besterr)) { pllcfg = (2 << 6) | div; bestfreq = fmul; } /* Try multiplier 144 */ fmul = fdiv * 144; if ((fdiv >= 390000) && (fdiv <= 667000)) if (!max310x_update_best_err(fmul, &besterr)) { pllcfg = (3 << 6) | div; bestfreq = fmul; } } /* Configure clock source */ clksrc = MAX310X_CLKSRC_EXTCLK_BIT | (xtal ? MAX310X_CLKSRC_CRYST_BIT : 0); /* Configure PLL */ if (pllcfg) { clksrc |= MAX310X_CLKSRC_PLL_BIT; regmap_write(s->regmap, MAX310X_PLLCFG_REG, pllcfg); } else clksrc |= MAX310X_CLKSRC_PLLBYP_BIT; regmap_write(s->regmap, MAX310X_CLKSRC_REG, clksrc); /* Wait for crystal */ if (xtal) { bool stable = false; unsigned int try = 0, val = 0; do { msleep(MAX310X_XTAL_WAIT_DELAY_MS); regmap_read(s->regmap, MAX310X_STS_IRQSTS_REG, &val); if (val & MAX310X_STS_CLKREADY_BIT) stable = true; } while (!stable && (++try < MAX310X_XTAL_WAIT_RETRIES)); if (!stable) return dev_err_probe(dev, -EAGAIN, "clock is not stable\n"); } return bestfreq; } static void max310x_batch_write(struct uart_port *port, u8 *txbuf, unsigned int len) { struct max310x_one *one = to_max310x_port(port); regmap_noinc_write(one->regmap, MAX310X_THR_REG, txbuf, len); } static void max310x_batch_read(struct uart_port *port, u8 *rxbuf, unsigned int len) { struct max310x_one *one = to_max310x_port(port); regmap_noinc_read(one->regmap, MAX310X_RHR_REG, rxbuf, len); } static void max310x_handle_rx(struct uart_port *port, unsigned int rxlen) { struct max310x_one *one = to_max310x_port(port); unsigned int sts, i; u8 ch, flag; if (port->read_status_mask == MAX310X_LSR_RXOVR_BIT) { /* * We are just reading, happily ignoring any error conditions. * Break condition, parity checking, framing errors -- they * are all ignored. That means that we can do a batch-read. * * There is a small opportunity for race if the RX FIFO * overruns while we're reading the buffer; the datasheets says * that the LSR register applies to the "current" character. * That's also the reason why we cannot do batched reads when * asked to check the individual statuses. */ sts = max310x_port_read(port, MAX310X_LSR_IRQSTS_REG); max310x_batch_read(port, one->rx_buf, rxlen); port->icount.rx += rxlen; flag = TTY_NORMAL; sts &= port->read_status_mask; if (sts & MAX310X_LSR_RXOVR_BIT) { dev_warn_ratelimited(port->dev, "Hardware RX FIFO overrun\n"); port->icount.overrun++; } for (i = 0; i < (rxlen - 1); ++i) uart_insert_char(port, sts, 0, one->rx_buf[i], flag); /* * Handle the overrun case for the last character only, since * the RxFIFO overflow happens after it is pushed to the FIFO * tail. */ uart_insert_char(port, sts, MAX310X_LSR_RXOVR_BIT, one->rx_buf[rxlen-1], flag); } else { if (unlikely(rxlen >= port->fifosize)) { dev_warn_ratelimited(port->dev, "Possible RX FIFO overrun\n"); port->icount.buf_overrun++; /* Ensure sanity of RX level */ rxlen = port->fifosize; } while (rxlen--) { ch = max310x_port_read(port, MAX310X_RHR_REG); sts = max310x_port_read(port, MAX310X_LSR_IRQSTS_REG); sts &= MAX310X_LSR_RXPAR_BIT | MAX310X_LSR_FRERR_BIT | MAX310X_LSR_RXOVR_BIT | MAX310X_LSR_RXBRK_BIT; port->icount.rx++; flag = TTY_NORMAL; if (unlikely(sts)) { if (sts & MAX310X_LSR_RXBRK_BIT) { port->icount.brk++; if (uart_handle_break(port)) continue; } else if (sts & MAX310X_LSR_RXPAR_BIT) port->icount.parity++; else if (sts & MAX310X_LSR_FRERR_BIT) port->icount.frame++; else if (sts & MAX310X_LSR_RXOVR_BIT) port->icount.overrun++; sts &= port->read_status_mask; if (sts & MAX310X_LSR_RXBRK_BIT) flag = TTY_BREAK; else if (sts & MAX310X_LSR_RXPAR_BIT) flag = TTY_PARITY; else if (sts & MAX310X_LSR_FRERR_BIT) flag = TTY_FRAME; else if (sts & MAX310X_LSR_RXOVR_BIT) flag = TTY_OVERRUN; } if (uart_handle_sysrq_char(port, ch)) continue; if (sts & port->ignore_status_mask) continue; uart_insert_char(port, sts, MAX310X_LSR_RXOVR_BIT, ch, flag); } } tty_flip_buffer_push(&port->state->port); } static void max310x_handle_tx(struct uart_port *port) { struct tty_port *tport = &port->state->port; unsigned int txlen, to_send; unsigned char *tail; if (unlikely(port->x_char)) { max310x_port_write(port, MAX310X_THR_REG, port->x_char); port->icount.tx++; port->x_char = 0; return; } if (kfifo_is_empty(&tport->xmit_fifo) || uart_tx_stopped(port)) return; /* * It's a circ buffer -- wrap around. * We could do that in one SPI transaction, but meh. */ while (!kfifo_is_empty(&tport->xmit_fifo)) { /* Limit to space available in TX FIFO */ txlen = max310x_port_read(port, MAX310X_TXFIFOLVL_REG); txlen = port->fifosize - txlen; if (!txlen) break; to_send = kfifo_out_linear_ptr(&tport->xmit_fifo, &tail, txlen); max310x_batch_write(port, tail, to_send); uart_xmit_advance(port, to_send); } if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS) uart_write_wakeup(port); } static void max310x_start_tx(struct uart_port *port) { struct max310x_one *one = to_max310x_port(port); schedule_work(&one->tx_work); } static irqreturn_t max310x_port_irq(struct max310x_port *s, int portno) { struct uart_port *port = &s->p[portno].port; irqreturn_t res = IRQ_NONE; do { unsigned int ists, lsr, rxlen; /* Read IRQ status & RX FIFO level */ ists = max310x_port_read(port, MAX310X_IRQSTS_REG); rxlen = max310x_port_read(port, MAX310X_RXFIFOLVL_REG); if (!ists && !rxlen) break; res = IRQ_HANDLED; if (ists & MAX310X_IRQ_CTS_BIT) { lsr = max310x_port_read(port, MAX310X_LSR_IRQSTS_REG); uart_handle_cts_change(port, lsr & MAX310X_LSR_CTS_BIT); } if (rxlen) max310x_handle_rx(port, rxlen); if (ists & MAX310X_IRQ_TXEMPTY_BIT) max310x_start_tx(port); } while (1); return res; } static irqreturn_t max310x_ist(int irq, void *dev_id) { struct max310x_port *s = (struct max310x_port *)dev_id; bool handled = false; if (s->devtype->nr > 1) { do { unsigned int val = ~0; WARN_ON_ONCE(regmap_read(s->regmap, MAX310X_GLOBALIRQ_REG, &val)); val = ((1 << s->devtype->nr) - 1) & ~val; if (!val) break; if (max310x_port_irq(s, fls(val) - 1) == IRQ_HANDLED) handled = true; } while (1); } else { if (max310x_port_irq(s, 0) == IRQ_HANDLED) handled = true; } return IRQ_RETVAL(handled); } static void max310x_tx_proc(struct work_struct *ws) { struct max310x_one *one = container_of(ws, struct max310x_one, tx_work); max310x_handle_tx(&one->port); } static unsigned int max310x_tx_empty(struct uart_port *port) { u8 lvl = max310x_port_read(port, MAX310X_TXFIFOLVL_REG); return lvl ? 0 : TIOCSER_TEMT; } static unsigned int max310x_get_mctrl(struct uart_port *port) { /* * DCD and DSR are not wired and CTS/RTS is handled automatically * so just indicate DSR and CAR asserted */ return TIOCM_DSR | TIOCM_CAR; } static void max310x_md_proc(struct work_struct *ws) { struct max310x_one *one = container_of(ws, struct max310x_one, md_work); max310x_port_update(&one->port, MAX310X_MODE2_REG, MAX310X_MODE2_LOOPBACK_BIT, (one->port.mctrl & TIOCM_LOOP) ? MAX310X_MODE2_LOOPBACK_BIT : 0); } static void max310x_set_mctrl(struct uart_port *port, unsigned int mctrl) { struct max310x_one *one = to_max310x_port(port); schedule_work(&one->md_work); } static void max310x_break_ctl(struct uart_port *port, int break_state) { max310x_port_update(port, MAX310X_LCR_REG, MAX310X_LCR_TXBREAK_BIT, break_state ? MAX310X_LCR_TXBREAK_BIT : 0); } static void max310x_set_termios(struct uart_port *port, struct ktermios *termios, const struct ktermios *old) { unsigned int lcr = 0, flow = 0; int baud; /* Mask termios capabilities we don't support */ termios->c_cflag &= ~CMSPAR; /* Word size */ switch (termios->c_cflag & CSIZE) { case CS5: break; case CS6: lcr = MAX310X_LCR_LENGTH0_BIT; break; case CS7: lcr = MAX310X_LCR_LENGTH1_BIT; break; case CS8: default: lcr = MAX310X_LCR_LENGTH1_BIT | MAX310X_LCR_LENGTH0_BIT; break; } /* Parity */ if (termios->c_cflag & PARENB) { lcr |= MAX310X_LCR_PARITY_BIT; if (!(termios->c_cflag & PARODD)) lcr |= MAX310X_LCR_EVENPARITY_BIT; } /* Stop bits */ if (termios->c_cflag & CSTOPB) lcr |= MAX310X_LCR_STOPLEN_BIT; /* 2 stops */ /* Update LCR register */ max310x_port_write(port, MAX310X_LCR_REG, lcr); /* Set read status mask */ port->read_status_mask = MAX310X_LSR_RXOVR_BIT; if (termios->c_iflag & INPCK) port->read_status_mask |= MAX310X_LSR_RXPAR_BIT | MAX310X_LSR_FRERR_BIT; if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK)) port->read_status_mask |= MAX310X_LSR_RXBRK_BIT; /* Set status ignore mask */ port->ignore_status_mask = 0; if (termios->c_iflag & IGNBRK) port->ignore_status_mask |= MAX310X_LSR_RXBRK_BIT; if (!(termios->c_cflag & CREAD)) port->ignore_status_mask |= MAX310X_LSR_RXPAR_BIT | MAX310X_LSR_RXOVR_BIT | MAX310X_LSR_FRERR_BIT | MAX310X_LSR_RXBRK_BIT; /* Configure flow control */ max310x_port_write(port, MAX310X_XON1_REG, termios->c_cc[VSTART]); max310x_port_write(port, MAX310X_XOFF1_REG, termios->c_cc[VSTOP]); /* * Disable transmitter before enabling AutoCTS or auto transmitter * flow control */ if (termios->c_cflag & CRTSCTS || termios->c_iflag & IXOFF) { max310x_port_update(port, MAX310X_MODE1_REG, MAX310X_MODE1_TXDIS_BIT, MAX310X_MODE1_TXDIS_BIT); } port->status &= ~(UPSTAT_AUTOCTS | UPSTAT_AUTORTS | UPSTAT_AUTOXOFF); if (termios->c_cflag & CRTSCTS) { /* Enable AUTORTS and AUTOCTS */ port->status |= UPSTAT_AUTOCTS | UPSTAT_AUTORTS; flow |= MAX310X_FLOWCTRL_AUTOCTS_BIT | MAX310X_FLOWCTRL_AUTORTS_BIT; } if (termios->c_iflag & IXON) flow |= MAX310X_FLOWCTRL_SWFLOW3_BIT | MAX310X_FLOWCTRL_SWFLOWEN_BIT; if (termios->c_iflag & IXOFF) { port->status |= UPSTAT_AUTOXOFF; flow |= MAX310X_FLOWCTRL_SWFLOW1_BIT | MAX310X_FLOWCTRL_SWFLOWEN_BIT; } max310x_port_write(port, MAX310X_FLOWCTRL_REG, flow); /* * Enable transmitter after disabling AutoCTS and auto transmitter * flow control */ if (!(termios->c_cflag & CRTSCTS) && !(termios->c_iflag & IXOFF)) { max310x_port_update(port, MAX310X_MODE1_REG, MAX310X_MODE1_TXDIS_BIT, 0); } /* Get baud rate generator configuration */ baud = uart_get_baud_rate(port, termios, old, port->uartclk / 16 / 0xffff, port->uartclk / 4); /* Setup baudrate generator */ baud = max310x_set_baud(port, baud); /* Update timeout according to new baud rate */ uart_update_timeout(port, termios->c_cflag, baud); } static void max310x_rs_proc(struct work_struct *ws) { struct max310x_one *one = container_of(ws, struct max310x_one, rs_work); unsigned int delay, mode1 = 0, mode2 = 0; delay = (one->port.rs485.delay_rts_before_send << 4) | one->port.rs485.delay_rts_after_send; max310x_port_write(&one->port, MAX310X_HDPIXDELAY_REG, delay); if (one->port.rs485.flags & SER_RS485_ENABLED) { mode1 = MAX310X_MODE1_TRNSCVCTRL_BIT; if (!(one->port.rs485.flags & SER_RS485_RX_DURING_TX)) mode2 = MAX310X_MODE2_ECHOSUPR_BIT; } max310x_port_update(&one->port, MAX310X_MODE1_REG, MAX310X_MODE1_TRNSCVCTRL_BIT, mode1); max310x_port_update(&one->port, MAX310X_MODE2_REG, MAX310X_MODE2_ECHOSUPR_BIT, mode2); } static int max310x_rs485_config(struct uart_port *port, struct ktermios *termios, struct serial_rs485 *rs485) { struct max310x_one *one = to_max310x_port(port); if ((rs485->delay_rts_before_send > 0x0f) || (rs485->delay_rts_after_send > 0x0f)) return -ERANGE; port->rs485 = *rs485; schedule_work(&one->rs_work); return 0; } static int max310x_startup(struct uart_port *port) { unsigned int val; max310x_power(port, 1); /* Configure MODE1 register */ max310x_port_update(port, MAX310X_MODE1_REG, MAX310X_MODE1_TRNSCVCTRL_BIT, 0); /* Configure MODE2 register & Reset FIFOs*/ val = MAX310X_MODE2_RXEMPTINV_BIT | MAX310X_MODE2_FIFORST_BIT; max310x_port_write(port, MAX310X_MODE2_REG, val); max310x_port_update(port, MAX310X_MODE2_REG, MAX310X_MODE2_FIFORST_BIT, 0); /* Configure mode1/mode2 to have rs485/rs232 enabled at startup */ val = (clamp(port->rs485.delay_rts_before_send, 0U, 15U) << 4) | clamp(port->rs485.delay_rts_after_send, 0U, 15U); max310x_port_write(port, MAX310X_HDPIXDELAY_REG, val); if (port->rs485.flags & SER_RS485_ENABLED) { max310x_port_update(port, MAX310X_MODE1_REG, MAX310X_MODE1_TRNSCVCTRL_BIT, MAX310X_MODE1_TRNSCVCTRL_BIT); if (!(port->rs485.flags & SER_RS485_RX_DURING_TX)) max310x_port_update(port, MAX310X_MODE2_REG, MAX310X_MODE2_ECHOSUPR_BIT, MAX310X_MODE2_ECHOSUPR_BIT); } /* * Configure flow control levels: * resume: 48 * halt: 96 */ max310x_port_write(port, MAX310X_FLOWLVL_REG, MAX310X_FLOWLVL_RES(48) | MAX310X_FLOWLVL_HALT(96)); /* Clear IRQ status register */ max310x_port_read(port, MAX310X_IRQSTS_REG); /* Enable RX, TX, CTS change interrupts */ val = MAX310X_IRQ_RXEMPTY_BIT | MAX310X_IRQ_TXEMPTY_BIT; max310x_port_write(port, MAX310X_IRQEN_REG, val | MAX310X_IRQ_CTS_BIT); return 0; } static void max310x_shutdown(struct uart_port *port) { /* Disable all interrupts */ max310x_port_write(port, MAX310X_IRQEN_REG, 0); max310x_power(port, 0); } static const char *max310x_type(struct uart_port *port) { struct max310x_port *s = dev_get_drvdata(port->dev); return (port->type == PORT_MAX310X) ? s->devtype->name : NULL; } static int max310x_request_port(struct uart_port *port) { /* Do nothing */ return 0; } static void max310x_config_port(struct uart_port *port, int flags) { if (flags & UART_CONFIG_TYPE) port->type = PORT_MAX310X; } static int max310x_verify_port(struct uart_port *port, struct serial_struct *s) { if ((s->type != PORT_UNKNOWN) && (s->type != PORT_MAX310X)) return -EINVAL; if (s->irq != port->irq) return -EINVAL; return 0; } static void max310x_null_void(struct uart_port *port) { /* Do nothing */ } static const struct uart_ops max310x_ops = { .tx_empty = max310x_tx_empty, .set_mctrl = max310x_set_mctrl, .get_mctrl = max310x_get_mctrl, .stop_tx = max310x_null_void, .start_tx = max310x_start_tx, .stop_rx = max310x_null_void, .break_ctl = max310x_break_ctl, .startup = max310x_startup, .shutdown = max310x_shutdown, .set_termios = max310x_set_termios, .type = max310x_type, .request_port = max310x_request_port, .release_port = max310x_null_void, .config_port = max310x_config_port, .verify_port = max310x_verify_port, }; static int __maybe_unused max310x_suspend(struct device *dev) { struct max310x_port *s = dev_get_drvdata(dev); int i; for (i = 0; i < s->devtype->nr; i++) { uart_suspend_port(&max310x_uart, &s->p[i].port); max310x_power(&s->p[i].port, 0); } return 0; } static int __maybe_unused max310x_resume(struct device *dev) { struct max310x_port *s = dev_get_drvdata(dev); int i; for (i = 0; i < s->devtype->nr; i++) { max310x_power(&s->p[i].port, 1); uart_resume_port(&max310x_uart, &s->p[i].port); } return 0; } static SIMPLE_DEV_PM_OPS(max310x_pm_ops, max310x_suspend, max310x_resume); #ifdef CONFIG_GPIOLIB static int max310x_gpio_get(struct gpio_chip *chip, unsigned int offset) { unsigned int val; struct max310x_port *s = gpiochip_get_data(chip); struct uart_port *port = &s->p[offset / 4].port; val = max310x_port_read(port, MAX310X_GPIODATA_REG); return !!((val >> 4) & (1 << (offset % 4))); } static void max310x_gpio_set(struct gpio_chip *chip, unsigned int offset, int value) { struct max310x_port *s = gpiochip_get_data(chip); struct uart_port *port = &s->p[offset / 4].port; max310x_port_update(port, MAX310X_GPIODATA_REG, 1 << (offset % 4), value ? 1 << (offset % 4) : 0); } static int max310x_gpio_direction_input(struct gpio_chip *chip, unsigned int offset) { struct max310x_port *s = gpiochip_get_data(chip); struct uart_port *port = &s->p[offset / 4].port; max310x_port_update(port, MAX310X_GPIOCFG_REG, 1 << (offset % 4), 0); return 0; } static int max310x_gpio_direction_output(struct gpio_chip *chip, unsigned int offset, int value) { struct max310x_port *s = gpiochip_get_data(chip); struct uart_port *port = &s->p[offset / 4].port; max310x_port_update(port, MAX310X_GPIODATA_REG, 1 << (offset % 4), value ? 1 << (offset % 4) : 0); max310x_port_update(port, MAX310X_GPIOCFG_REG, 1 << (offset % 4), 1 << (offset % 4)); return 0; } static int max310x_gpio_set_config(struct gpio_chip *chip, unsigned int offset, unsigned long config) { struct max310x_port *s = gpiochip_get_data(chip); struct uart_port *port = &s->p[offset / 4].port; switch (pinconf_to_config_param(config)) { case PIN_CONFIG_DRIVE_OPEN_DRAIN: max310x_port_update(port, MAX310X_GPIOCFG_REG, 1 << ((offset % 4) + 4), 1 << ((offset % 4) + 4)); return 0; case PIN_CONFIG_DRIVE_PUSH_PULL: max310x_port_update(port, MAX310X_GPIOCFG_REG, 1 << ((offset % 4) + 4), 0); return 0; default: return -ENOTSUPP; } } #endif static const struct serial_rs485 max310x_rs485_supported = { .flags = SER_RS485_ENABLED | SER_RS485_RTS_ON_SEND | SER_RS485_RX_DURING_TX, .delay_rts_before_send = 1, .delay_rts_after_send = 1, }; static int max310x_probe(struct device *dev, const struct max310x_devtype *devtype, const struct max310x_if_cfg *if_cfg, struct regmap *regmaps[], int irq) { int i, ret, fmin, fmax, freq; struct max310x_port *s; s32 uartclk = 0; bool xtal; for (i = 0; i < devtype->nr; i++) if (IS_ERR(regmaps[i])) return PTR_ERR(regmaps[i]); /* Alloc port structure */ s = devm_kzalloc(dev, struct_size(s, p, devtype->nr), GFP_KERNEL); if (!s) return dev_err_probe(dev, -ENOMEM, "Error allocating port structure\n"); /* Always ask for fixed clock rate from a property. */ device_property_read_u32(dev, "clock-frequency", &uartclk); xtal = device_property_match_string(dev, "clock-names", "osc") < 0; if (xtal) s->clk = devm_clk_get_optional(dev, "xtal"); else s->clk = devm_clk_get_optional(dev, "osc"); if (IS_ERR(s->clk)) return PTR_ERR(s->clk); ret = clk_prepare_enable(s->clk); if (ret) return ret; freq = clk_get_rate(s->clk); if (freq == 0) freq = uartclk; if (freq == 0) { ret = dev_err_probe(dev, -EINVAL, "Cannot get clock rate\n"); goto out_clk; } if (xtal) { fmin = 1000000; fmax = 4000000; } else { fmin = 500000; fmax = 35000000; } /* Check frequency limits */ if (freq < fmin || freq > fmax) { ret = -ERANGE; goto out_clk; } s->regmap = regmaps[0]; s->devtype = devtype; s->if_cfg = if_cfg; dev_set_drvdata(dev, s); /* Check device to ensure we are talking to what we expect */ ret = max310x_detect(dev); if (ret) goto out_clk; for (i = 0; i < devtype->nr; i++) { bool started = false; unsigned int try = 0, val = 0; /* Reset port */ regmap_write(regmaps[i], MAX310X_MODE2_REG, MAX310X_MODE2_RST_BIT); /* Clear port reset */ regmap_write(regmaps[i], MAX310X_MODE2_REG, 0); /* Wait for port startup */ do { msleep(MAX310X_PORT_STARTUP_WAIT_DELAY_MS); regmap_read(regmaps[i], MAX310X_BRGDIVLSB_REG, &val); if (val == 0x01) started = true; } while (!started && (++try < MAX310X_PORT_STARTUP_WAIT_RETRIES)); if (!started) { ret = dev_err_probe(dev, -EAGAIN, "port reset failed\n"); goto out_uart; } regmap_write(regmaps[i], MAX310X_MODE1_REG, devtype->mode1); } uartclk = max310x_set_ref_clk(dev, s, freq, xtal); if (uartclk < 0) { ret = uartclk; goto out_uart; } dev_dbg(dev, "Reference clock set to %i Hz\n", uartclk); for (i = 0; i < devtype->nr; i++) { unsigned int line; line = find_first_zero_bit(max310x_lines, MAX310X_UART_NRMAX); if (line == MAX310X_UART_NRMAX) { ret = -ERANGE; goto out_uart; } /* Initialize port data */ s->p[i].port.line = line; s->p[i].port.dev = dev; s->p[i].port.irq = irq; s->p[i].port.type = PORT_MAX310X; s->p[i].port.fifosize = MAX310X_FIFO_SIZE; s->p[i].port.flags = UPF_FIXED_TYPE | UPF_LOW_LATENCY; s->p[i].port.iotype = UPIO_PORT; s->p[i].port.iobase = i; /* * Use all ones as membase to make sure uart_configure_port() in * serial_core.c does not abort for SPI/I2C devices where the * membase address is not applicable. */ s->p[i].port.membase = (void __iomem *)~0; s->p[i].port.uartclk = uartclk; s->p[i].port.rs485_config = max310x_rs485_config; s->p[i].port.rs485_supported = max310x_rs485_supported; s->p[i].port.ops = &max310x_ops; s->p[i].regmap = regmaps[i]; /* Disable all interrupts */ max310x_port_write(&s->p[i].port, MAX310X_IRQEN_REG, 0); /* Clear IRQ status register */ max310x_port_read(&s->p[i].port, MAX310X_IRQSTS_REG); /* Initialize queue for start TX */ INIT_WORK(&s->p[i].tx_work, max310x_tx_proc); /* Initialize queue for changing LOOPBACK mode */ INIT_WORK(&s->p[i].md_work, max310x_md_proc); /* Initialize queue for changing RS485 mode */ INIT_WORK(&s->p[i].rs_work, max310x_rs_proc); /* Register port */ ret = uart_add_one_port(&max310x_uart, &s->p[i].port); if (ret) goto out_uart; set_bit(line, max310x_lines); /* Go to suspend mode */ max310x_power(&s->p[i].port, 0); } #ifdef CONFIG_GPIOLIB /* Setup GPIO controller */ s->gpio.owner = THIS_MODULE; s->gpio.parent = dev; s->gpio.label = devtype->name; s->gpio.direction_input = max310x_gpio_direction_input; s->gpio.get = max310x_gpio_get; s->gpio.direction_output= max310x_gpio_direction_output; s->gpio.set = max310x_gpio_set; s->gpio.set_config = max310x_gpio_set_config; s->gpio.base = -1; s->gpio.ngpio = devtype->nr * 4; s->gpio.can_sleep = 1; ret = devm_gpiochip_add_data(dev, &s->gpio, s); if (ret) goto out_uart; #endif /* Setup interrupt */ ret = devm_request_threaded_irq(dev, irq, NULL, max310x_ist, IRQF_ONESHOT | IRQF_SHARED, dev_name(dev), s); if (!ret) return 0; dev_err(dev, "Unable to request IRQ %i\n", irq); out_uart: for (i = 0; i < devtype->nr; i++) { if (test_and_clear_bit(s->p[i].port.line, max310x_lines)) uart_remove_one_port(&max310x_uart, &s->p[i].port); } out_clk: clk_disable_unprepare(s->clk); return ret; } static void max310x_remove(struct device *dev) { struct max310x_port *s = dev_get_drvdata(dev); int i; for (i = 0; i < s->devtype->nr; i++) { cancel_work_sync(&s->p[i].tx_work); cancel_work_sync(&s->p[i].md_work); cancel_work_sync(&s->p[i].rs_work); if (test_and_clear_bit(s->p[i].port.line, max310x_lines)) uart_remove_one_port(&max310x_uart, &s->p[i].port); max310x_power(&s->p[i].port, 0); } clk_disable_unprepare(s->clk); } static const struct of_device_id __maybe_unused max310x_dt_ids[] = { { .compatible = "maxim,max3107", .data = &max3107_devtype, }, { .compatible = "maxim,max3108", .data = &max3108_devtype, }, { .compatible = "maxim,max3109", .data = &max3109_devtype, }, { .compatible = "maxim,max14830", .data = &max14830_devtype }, { } }; MODULE_DEVICE_TABLE(of, max310x_dt_ids); static struct regmap_config regcfg = { .reg_bits = 8, .val_bits = 8, .write_flag_mask = MAX310X_WRITE_BIT, .cache_type = REGCACHE_MAPLE, .max_register = MAX310X_REG_1F, .writeable_reg = max310x_reg_writeable, .volatile_reg = max310x_reg_volatile, .precious_reg = max310x_reg_precious, .writeable_noinc_reg = max310x_reg_noinc, .readable_noinc_reg = max310x_reg_noinc, .max_raw_read = MAX310X_FIFO_SIZE, .max_raw_write = MAX310X_FIFO_SIZE, }; static const char *max310x_regmap_name(u8 port_id) { switch (port_id) { case 0: return "port0"; case 1: return "port1"; case 2: return "port2"; case 3: return "port3"; default: WARN_ON(true); return NULL; } } #ifdef CONFIG_SPI_MASTER static int max310x_spi_extended_reg_enable(struct device *dev, bool enable) { struct max310x_port *s = dev_get_drvdata(dev); return regmap_write(s->regmap, MAX310X_GLOBALCMD_REG, enable ? MAX310X_EXTREG_ENBL : MAX310X_EXTREG_DSBL); } static const struct max310x_if_cfg __maybe_unused max310x_spi_if_cfg = { .extended_reg_enable = max310x_spi_extended_reg_enable, .rev_id_offset = MAX310X_EXTREG_START, }; static int max310x_spi_probe(struct spi_device *spi) { const struct max310x_devtype *devtype; struct regmap *regmaps[MAX310X_MAX_PORTS]; unsigned int i; int ret; /* Setup SPI bus */ spi->bits_per_word = 8; spi->mode = spi->mode ? : SPI_MODE_0; spi->max_speed_hz = spi->max_speed_hz ? : 26000000; ret = spi_setup(spi); if (ret) return ret; devtype = spi_get_device_match_data(spi); if (!devtype) return dev_err_probe(&spi->dev, -ENODEV, "Failed to match device\n"); for (i = 0; i < devtype->nr; i++) { u8 port_mask = i * 0x20; regcfg.name = max310x_regmap_name(i); regcfg.read_flag_mask = port_mask; regcfg.write_flag_mask = port_mask | MAX310X_WRITE_BIT; regmaps[i] = devm_regmap_init_spi(spi, ®cfg); } return max310x_probe(&spi->dev, devtype, &max310x_spi_if_cfg, regmaps, spi->irq); } static void max310x_spi_remove(struct spi_device *spi) { max310x_remove(&spi->dev); } static const struct spi_device_id max310x_id_table[] = { { "max3107", (kernel_ulong_t)&max3107_devtype, }, { "max3108", (kernel_ulong_t)&max3108_devtype, }, { "max3109", (kernel_ulong_t)&max3109_devtype, }, { "max14830", (kernel_ulong_t)&max14830_devtype, }, { } }; MODULE_DEVICE_TABLE(spi, max310x_id_table); static struct spi_driver max310x_spi_driver = { .driver = { .name = MAX310X_NAME, .of_match_table = max310x_dt_ids, .pm = &max310x_pm_ops, }, .probe = max310x_spi_probe, .remove = max310x_spi_remove, .id_table = max310x_id_table, }; #endif #ifdef CONFIG_I2C static int max310x_i2c_extended_reg_enable(struct device *dev, bool enable) { return 0; } static struct regmap_config regcfg_i2c = { .reg_bits = 8, .val_bits = 8, .cache_type = REGCACHE_MAPLE, .writeable_reg = max310x_reg_writeable, .volatile_reg = max310x_reg_volatile, .precious_reg = max310x_reg_precious, .max_register = MAX310X_REVID_EXTREG, .writeable_noinc_reg = max310x_reg_noinc, .readable_noinc_reg = max310x_reg_noinc, .max_raw_read = MAX310X_FIFO_SIZE, .max_raw_write = MAX310X_FIFO_SIZE, }; static const struct max310x_if_cfg max310x_i2c_if_cfg = { .extended_reg_enable = max310x_i2c_extended_reg_enable, .rev_id_offset = 0, /* No offset in I2C mode. */ }; static unsigned short max310x_i2c_slave_addr(unsigned short addr, unsigned int nr) { /* * For MAX14830 and MAX3109, the slave address depends on what the * A0 and A1 pins are tied to. * See Table I2C Address Map of the datasheet. * Based on that table, the following formulas were determined: * UART1 - UART0 = 0x10 * UART2 - UART1 = 0x20 + 0x10 * UART3 - UART2 = 0x10 */ addr -= nr * 0x10; if (nr >= 2) addr -= 0x20; return addr; } static int max310x_i2c_probe(struct i2c_client *client) { const struct max310x_devtype *devtype; struct i2c_client *port_client; struct regmap *regmaps[MAX310X_MAX_PORTS]; unsigned int i; u8 port_addr; devtype = i2c_get_match_data(client); if (!devtype) return dev_err_probe(&client->dev, -ENODEV, "Failed to match device\n"); if (client->addr < devtype->slave_addr.min || client->addr > devtype->slave_addr.max) return dev_err_probe(&client->dev, -EINVAL, "Slave addr 0x%x outside of range [0x%x, 0x%x]\n", client->addr, devtype->slave_addr.min, devtype->slave_addr.max); regcfg_i2c.name = max310x_regmap_name(0); regmaps[0] = devm_regmap_init_i2c(client, ®cfg_i2c); for (i = 1; i < devtype->nr; i++) { port_addr = max310x_i2c_slave_addr(client->addr, i); port_client = devm_i2c_new_dummy_device(&client->dev, client->adapter, port_addr); regcfg_i2c.name = max310x_regmap_name(i); regmaps[i] = devm_regmap_init_i2c(port_client, ®cfg_i2c); } return max310x_probe(&client->dev, devtype, &max310x_i2c_if_cfg, regmaps, client->irq); } static void max310x_i2c_remove(struct i2c_client *client) { max310x_remove(&client->dev); } static const struct i2c_device_id max310x_i2c_id_table[] = { { "max3107", (kernel_ulong_t)&max3107_devtype, }, { "max3108", (kernel_ulong_t)&max3108_devtype, }, { "max3109", (kernel_ulong_t)&max3109_devtype, }, { "max14830", (kernel_ulong_t)&max14830_devtype, }, { } }; MODULE_DEVICE_TABLE(i2c, max310x_i2c_id_table); static struct i2c_driver max310x_i2c_driver = { .driver = { .name = MAX310X_NAME, .of_match_table = max310x_dt_ids, .pm = &max310x_pm_ops, }, .probe = max310x_i2c_probe, .remove = max310x_i2c_remove, .id_table = max310x_i2c_id_table, }; #endif static int __init max310x_uart_init(void) { int ret; bitmap_zero(max310x_lines, MAX310X_UART_NRMAX); ret = uart_register_driver(&max310x_uart); if (ret) return ret; #ifdef CONFIG_SPI_MASTER ret = spi_register_driver(&max310x_spi_driver); if (ret) goto err_spi_register; #endif #ifdef CONFIG_I2C ret = i2c_add_driver(&max310x_i2c_driver); if (ret) goto err_i2c_register; #endif return 0; #ifdef CONFIG_I2C err_i2c_register: spi_unregister_driver(&max310x_spi_driver); #endif err_spi_register: uart_unregister_driver(&max310x_uart); return ret; } module_init(max310x_uart_init); static void __exit max310x_uart_exit(void) { #ifdef CONFIG_I2C i2c_del_driver(&max310x_i2c_driver); #endif #ifdef CONFIG_SPI_MASTER spi_unregister_driver(&max310x_spi_driver); #endif uart_unregister_driver(&max310x_uart); } module_exit(max310x_uart_exit); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>"); MODULE_DESCRIPTION("MAX310X serial driver");
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