diff options
| -rw-r--r-- | drivers/tty/serial/8250/8250_mid.c | 258 | ||||
| -rw-r--r-- | drivers/tty/serial/8250/8250_pci.c | 228 | ||||
| -rw-r--r-- | drivers/tty/serial/8250/Kconfig | 8 | ||||
| -rw-r--r-- | drivers/tty/serial/8250/Makefile | 1 |
4 files changed, 273 insertions, 222 deletions
diff --git a/drivers/tty/serial/8250/8250_mid.c b/drivers/tty/serial/8250/8250_mid.c new file mode 100644 index 000000000000..61f604c7aeee --- /dev/null +++ b/drivers/tty/serial/8250/8250_mid.c @@ -0,0 +1,258 @@ +/* + * 8250_mid.c - Driver for UART on Intel Penwell and various other Intel SOCs + * + * Copyright (C) 2015 Intel Corporation + * Author: Heikki Krogerus <heikki.krogerus@linux.intel.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/rational.h> +#include <linux/module.h> +#include <linux/pci.h> + +#include <linux/dma/hsu.h> + +#include "8250.h" + +#define PCI_DEVICE_ID_INTEL_PNW_UART1 0x081b +#define PCI_DEVICE_ID_INTEL_PNW_UART2 0x081c +#define PCI_DEVICE_ID_INTEL_PNW_UART3 0x081d +#define PCI_DEVICE_ID_INTEL_TNG_UART 0x1191 + +/* Intel MID Specific registers */ +#define INTEL_MID_UART_PS 0x30 +#define INTEL_MID_UART_MUL 0x34 +#define INTEL_MID_UART_DIV 0x38 + +struct mid8250; + +struct mid8250_board { + unsigned long freq; + unsigned int base_baud; + int (*setup)(struct mid8250 *, struct uart_port *p); +}; + +struct mid8250 { + int line; + int dma_index; + struct pci_dev *dma_dev; + struct uart_8250_dma dma; + struct mid8250_board *board; +}; + +/*****************************************************************************/ + +static int pnw_setup(struct mid8250 *mid, struct uart_port *p) +{ + struct pci_dev *pdev = to_pci_dev(p->dev); + + switch (pdev->device) { + case PCI_DEVICE_ID_INTEL_PNW_UART1: + mid->dma_index = 0; + break; + case PCI_DEVICE_ID_INTEL_PNW_UART2: + mid->dma_index = 1; + break; + case PCI_DEVICE_ID_INTEL_PNW_UART3: + mid->dma_index = 2; + break; + default: + return -EINVAL; + } + + mid->dma_dev = pci_get_slot(pdev->bus, + PCI_DEVFN(PCI_SLOT(pdev->devfn), 3)); + return 0; +} + +static int tng_setup(struct mid8250 *mid, struct uart_port *p) +{ + struct pci_dev *pdev = to_pci_dev(p->dev); + int index = PCI_FUNC(pdev->devfn); + + /* Currently no support for HSU port0 */ + if (index-- == 0) + return -ENODEV; + + mid->dma_index = index; + mid->dma_dev = pci_get_slot(pdev->bus, PCI_DEVFN(5, 0)); + return 0; +} + +/*****************************************************************************/ + +static void mid8250_set_termios(struct uart_port *p, + struct ktermios *termios, + struct ktermios *old) +{ + unsigned int baud = tty_termios_baud_rate(termios); + struct mid8250 *mid = p->private_data; + unsigned short ps = 16; + unsigned long fuart = baud * ps; + unsigned long w = BIT(24) - 1; + unsigned long mul, div; + + if (mid->board->freq < fuart) { + /* Find prescaler value that satisfies Fuart < Fref */ + if (mid->board->freq > baud) + ps = mid->board->freq / baud; /* baud rate too high */ + else + ps = 1; /* PLL case */ + fuart = baud * ps; + } else { + /* Get Fuart closer to Fref */ + fuart *= rounddown_pow_of_two(mid->board->freq / fuart); + } + + rational_best_approximation(fuart, mid->board->freq, w, w, &mul, &div); + p->uartclk = fuart * 16 / ps; /* core uses ps = 16 always */ + + writel(ps, p->membase + INTEL_MID_UART_PS); /* set PS */ + writel(mul, p->membase + INTEL_MID_UART_MUL); /* set MUL */ + writel(div, p->membase + INTEL_MID_UART_DIV); + + serial8250_do_set_termios(p, termios, old); +} + +static bool mid8250_dma_filter(struct dma_chan *chan, void *param) +{ + struct hsu_dma_slave *s = param; + + if (s->dma_dev != chan->device->dev || s->chan_id != chan->chan_id) + return false; + + chan->private = s; + return true; +} + +static int mid8250_dma_setup(struct mid8250 *mid, struct uart_8250_port *port) +{ + struct uart_8250_dma *dma = &mid->dma; + struct device *dev = port->port.dev; + struct hsu_dma_slave *rx_param; + struct hsu_dma_slave *tx_param; + + rx_param = devm_kzalloc(dev, sizeof(*rx_param), GFP_KERNEL); + if (!rx_param) + return -ENOMEM; + + tx_param = devm_kzalloc(dev, sizeof(*tx_param), GFP_KERNEL); + if (!tx_param) + return -ENOMEM; + + rx_param->chan_id = mid->dma_index * 2 + 1; + tx_param->chan_id = mid->dma_index * 2; + + dma->rxconf.src_maxburst = 64; + dma->txconf.dst_maxburst = 64; + + rx_param->dma_dev = &mid->dma_dev->dev; + tx_param->dma_dev = &mid->dma_dev->dev; + + dma->fn = mid8250_dma_filter; + dma->rx_param = rx_param; + dma->tx_param = tx_param; + + port->dma = dma; + return 0; +} + +static int mid8250_probe(struct pci_dev *pdev, const struct pci_device_id *id) +{ + struct uart_8250_port uart; + struct mid8250 *mid; + int ret; + + ret = pcim_enable_device(pdev); + if (ret) + return ret; + + pci_set_master(pdev); + + mid = devm_kzalloc(&pdev->dev, sizeof(*mid), GFP_KERNEL); + if (!mid) + return -ENOMEM; + + mid->board = (struct mid8250_board *)id->driver_data; + + memset(&uart, 0, sizeof(struct uart_8250_port)); + + uart.port.dev = &pdev->dev; + uart.port.irq = pdev->irq; + uart.port.private_data = mid; + uart.port.type = PORT_16750; + uart.port.iotype = UPIO_MEM; + uart.port.uartclk = mid->board->base_baud * 16; + uart.port.flags = UPF_SHARE_IRQ | UPF_FIXED_PORT | UPF_FIXED_TYPE; + uart.port.set_termios = mid8250_set_termios; + + uart.port.mapbase = pci_resource_start(pdev, 0); + uart.port.membase = pcim_iomap(pdev, 0, 0); + if (!uart.port.membase) + return -ENOMEM; + + if (mid->board->setup) { + ret = mid->board->setup(mid, &uart.port); + if (ret) + return ret; + } + + ret = mid8250_dma_setup(mid, &uart); + if (ret) + return ret; + + ret = serial8250_register_8250_port(&uart); + if (ret < 0) + return ret; + + mid->line = ret; + + pci_set_drvdata(pdev, mid); + return 0; +} + +static void mid8250_remove(struct pci_dev *pdev) +{ + struct mid8250 *mid = pci_get_drvdata(pdev); + + serial8250_unregister_port(mid->line); +} + +static const struct mid8250_board pnw_board = { + .freq = 50000000, + .base_baud = 115200, + .setup = pnw_setup, +}; + +static const struct mid8250_board tng_board = { + .freq = 38400000, + .base_baud = 1843200, + .setup = tng_setup, +}; + +#define MID_DEVICE(id, board) { PCI_VDEVICE(INTEL, id), (kernel_ulong_t)&board } + +static const struct pci_device_id pci_ids[] = { + MID_DEVICE(PCI_DEVICE_ID_INTEL_PNW_UART1, pnw_board), + MID_DEVICE(PCI_DEVICE_ID_INTEL_PNW_UART2, pnw_board), + MID_DEVICE(PCI_DEVICE_ID_INTEL_PNW_UART3, pnw_board), + MID_DEVICE(PCI_DEVICE_ID_INTEL_TNG_UART, tng_board), + { }, +}; +MODULE_DEVICE_TABLE(pci, pci_ids); + +static struct pci_driver mid8250_pci_driver = { + .name = "8250_mid", + .id_table = pci_ids, + .probe = mid8250_probe, + .remove = mid8250_remove, +}; + +module_pci_driver(mid8250_pci_driver); + +MODULE_AUTHOR("Intel Corporation"); +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("Intel MID UART driver"); diff --git a/drivers/tty/serial/8250/8250_pci.c b/drivers/tty/serial/8250/8250_pci.c index 68042dd1c525..177eaeafeb3e 100644 --- a/drivers/tty/serial/8250/8250_pci.c +++ b/drivers/tty/serial/8250/8250_pci.c @@ -28,7 +28,6 @@ #include <linux/dmaengine.h> #include <linux/platform_data/dma-dw.h> -#include <linux/platform_data/dma-hsu.h> #include "8250.h" @@ -1508,167 +1507,6 @@ byt_serial_setup(struct serial_private *priv, return ret; } -#define INTEL_MID_UART_PS 0x30 -#define INTEL_MID_UART_MUL 0x34 -#define INTEL_MID_UART_DIV 0x38 - -static void intel_mid_set_termios(struct uart_port *p, - struct ktermios *termios, - struct ktermios *old, - unsigned long fref) -{ - unsigned int baud = tty_termios_baud_rate(termios); - unsigned short ps = 16; - unsigned long fuart = baud * ps; - unsigned long w = BIT(24) - 1; - unsigned long mul, div; - - if (fref < fuart) { - /* Find prescaler value that satisfies Fuart < Fref */ - if (fref > baud) - ps = fref / baud; /* baud rate too high */ - else - ps = 1; /* PLL case */ - fuart = baud * ps; - } else { - /* Get Fuart closer to Fref */ - fuart *= rounddown_pow_of_two(fref / fuart); - } - - rational_best_approximation(fuart, fref, w, w, &mul, &div); - p->uartclk = fuart * 16 / ps; /* core uses ps = 16 always */ - - writel(ps, p->membase + INTEL_MID_UART_PS); /* set PS */ - writel(mul, p->membase + INTEL_MID_UART_MUL); /* set MUL */ - writel(div, p->membase + INTEL_MID_UART_DIV); - - serial8250_do_set_termios(p, termios, old); -} - -static void intel_mid_set_termios_38_4M(struct uart_port *p, - struct ktermios *termios, - struct ktermios *old) -{ - intel_mid_set_termios(p, termios, old, 38400000); -} - -static void intel_mid_set_termios_50M(struct uart_port *p, - struct ktermios *termios, - struct ktermios *old) -{ - /* - * The uart clk is 50Mhz, and the baud rate come from: - * baud = 50M * MUL / (DIV * PS * DLAB) - */ - intel_mid_set_termios(p, termios, old, 50000000); -} - -static bool intel_mid_dma_filter(struct dma_chan *chan, void *param) -{ - struct hsu_dma_slave *s = param; - - if (s->dma_dev != chan->device->dev || s->chan_id != chan->chan_id) - return false; - - chan->private = s; - return true; -} - -static int intel_mid_serial_setup(struct serial_private *priv, - const struct pciserial_board *board, - struct uart_8250_port *port, int idx, - int index, struct pci_dev *dma_dev) -{ - struct device *dev = port->port.dev; - struct uart_8250_dma *dma; - struct hsu_dma_slave *tx_param, *rx_param; - - dma = devm_kzalloc(dev, sizeof(*dma), GFP_KERNEL); - if (!dma) - return -ENOMEM; - - tx_param = devm_kzalloc(dev, sizeof(*tx_param), GFP_KERNEL); - if (!tx_param) - return -ENOMEM; - - rx_param = devm_kzalloc(dev, sizeof(*rx_param), GFP_KERNEL); - if (!rx_param) - return -ENOMEM; - - rx_param->chan_id = index * 2 + 1; - tx_param->chan_id = index * 2; - - dma->rxconf.src_maxburst = 64; - dma->txconf.dst_maxburst = 64; - - rx_param->dma_dev = &dma_dev->dev; - tx_param->dma_dev = &dma_dev->dev; - - dma->fn = intel_mid_dma_filter; - dma->rx_param = rx_param; - dma->tx_param = tx_param; - - port->port.type = PORT_16750; - port->port.flags |= UPF_FIXED_PORT | UPF_FIXED_TYPE; - port->dma = dma; - - return pci_default_setup(priv, board, port, idx); -} - -#define PCI_DEVICE_ID_INTEL_PNW_UART1 0x081b -#define PCI_DEVICE_ID_INTEL_PNW_UART2 0x081c -#define PCI_DEVICE_ID_INTEL_PNW_UART3 0x081d - -static int pnw_serial_setup(struct serial_private *priv, - const struct pciserial_board *board, - struct uart_8250_port *port, int idx) -{ - struct pci_dev *pdev = priv->dev; - struct pci_dev *dma_dev; - int index; - - switch (pdev->device) { - case PCI_DEVICE_ID_INTEL_PNW_UART1: - index = 0; - break; - case PCI_DEVICE_ID_INTEL_PNW_UART2: - index = 1; - break; - case PCI_DEVICE_ID_INTEL_PNW_UART3: - index = 2; - break; - default: - return -EINVAL; - } - - dma_dev = pci_get_slot(pdev->bus, PCI_DEVFN(PCI_SLOT(pdev->devfn), 3)); - - port->port.set_termios = intel_mid_set_termios_50M; - - return intel_mid_serial_setup(priv, board, port, idx, index, dma_dev); -} - -#define PCI_DEVICE_ID_INTEL_TNG_UART 0x1191 - -static int tng_serial_setup(struct serial_private *priv, - const struct pciserial_board *board, - struct uart_8250_port *port, int idx) -{ - struct pci_dev *pdev = priv->dev; - struct pci_dev *dma_dev; - int index = PCI_FUNC(pdev->devfn); - - /* Currently no support for HSU port0 */ - if (index-- == 0) - return -ENODEV; - - dma_dev = pci_get_slot(pdev->bus, PCI_DEVFN(5, 0)); - - port->port.set_termios = intel_mid_set_termios_38_4M; - - return intel_mid_serial_setup(priv, board, port, idx, index, dma_dev); -} - static int pci_omegapci_setup(struct serial_private *priv, const struct pciserial_board *board, @@ -2212,34 +2050,6 @@ static struct pci_serial_quirk pci_serial_quirks[] __refdata = { }, { .vendor = PCI_VENDOR_ID_INTEL, - .device = PCI_DEVICE_ID_INTEL_PNW_UART1, - .subvendor = PCI_ANY_ID, - .subdevice = PCI_ANY_ID, - .setup = pnw_serial_setup, - }, - { - .vendor = PCI_VENDOR_ID_INTEL, - .device = PCI_DEVICE_ID_INTEL_PNW_UART2, - .subvendor = PCI_ANY_ID, - .subdevice = PCI_ANY_ID, - .setup = pnw_serial_setup, - }, - { - .vendor = PCI_VENDOR_ID_INTEL, - .device = PCI_DEVICE_ID_INTEL_PNW_UART3, - .subvendor = PCI_ANY_ID, - .subdevice = PCI_ANY_ID, - .setup = pnw_serial_setup, - }, - { - .vendor = PCI_VENDOR_ID_INTEL, - .device = PCI_DEVICE_ID_INTEL_TNG_UART, - .subvendor = PCI_ANY_ID, - .subdevice = PCI_ANY_ID, - .setup = tng_serial_setup, - }, - { - .vendor = PCI_VENDOR_ID_INTEL, .device = PCI_DEVICE_ID_INTEL_BSW_UART1, .subvendor = PCI_ANY_ID, .subdevice = PCI_ANY_ID, @@ -3119,8 +2929,6 @@ enum pci_board_num_t { pbn_ADDIDATA_PCIe_8_3906250, pbn_ce4100_1_115200, pbn_byt, - pbn_pnw, - pbn_tng, pbn_qrk, pbn_omegapci, pbn_NETMOS9900_2s_115200, @@ -3907,16 +3715,6 @@ static struct pciserial_board pci_boards[] = { .uart_offset = 0x80, .reg_shift = 2, }, - [pbn_pnw] = { - .flags = FL_BASE0, - .num_ports = 1, - .base_baud = 115200, - }, - [pbn_tng] = { - .flags = FL_BASE0, - .num_ports = 1, - .base_baud = 1843200, - }, [pbn_qrk] = { .flags = FL_BASE0, .num_ports = 1, @@ -4005,6 +3803,12 @@ static const struct pci_device_id blacklist[] = { { PCI_DEVICE(0x4348, 0x5053), }, /* WCH CH353 1S1P */ { PCI_DEVICE(0x1c00, 0x3250), }, /* WCH CH382 2S1P */ { PCI_DEVICE(0x1c00, 0x3470), }, /* WCH CH384 4S */ + + /* Intel platforms with MID UART */ + { PCI_VDEVICE(INTEL, 0x081b), }, + { PCI_VDEVICE(INTEL, 0x081c), }, + { PCI_VDEVICE(INTEL, 0x081d), }, + { PCI_VDEVICE(INTEL, 0x1191), }, }; /* @@ -5702,26 +5506,6 @@ static struct pci_device_id serial_pci_tbl[] = { pbn_byt }, /* - * Intel Penwell - */ - { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_PNW_UART1, - PCI_ANY_ID, PCI_ANY_ID, 0, 0, - pbn_pnw}, - { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_PNW_UART2, - PCI_ANY_ID, PCI_ANY_ID, 0, 0, - pbn_pnw}, - { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_PNW_UART3, - PCI_ANY_ID, PCI_ANY_ID, 0, 0, - pbn_pnw}, - - /* - * Intel Tangier - */ - { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_TNG_UART, - PCI_ANY_ID, PCI_ANY_ID, 0, 0, - pbn_tng}, - - /* * Intel Quark x1000 */ { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_QRK_UART, diff --git a/drivers/tty/serial/8250/Kconfig b/drivers/tty/serial/8250/Kconfig index 43925571e177..f4a689743aa2 100644 --- a/drivers/tty/serial/8250/Kconfig +++ b/drivers/tty/serial/8250/Kconfig @@ -367,3 +367,11 @@ config SERIAL_8250_INGENIC help If you have a system using an Ingenic SoC and wish to make use of its UARTs, say Y to this option. If unsure, say N. + +config SERIAL_8250_MID + tristate "Support for serial ports on Intel MID platforms" + depends on SERIAL_8250 && PCI + help + Selecting this option will enable handling of the extra features + present on the UART found on Intel Medfield SOC and various other + Intel platforms. diff --git a/drivers/tty/serial/8250/Makefile b/drivers/tty/serial/8250/Makefile index 39c6d2277570..e177f8681ada 100644 --- a/drivers/tty/serial/8250/Makefile +++ b/drivers/tty/serial/8250/Makefile @@ -27,5 +27,6 @@ obj-$(CONFIG_SERIAL_8250_LPC18XX) += 8250_lpc18xx.o obj-$(CONFIG_SERIAL_8250_MT6577) += 8250_mtk.o obj-$(CONFIG_SERIAL_8250_UNIPHIER) += 8250_uniphier.o obj-$(CONFIG_SERIAL_8250_INGENIC) += 8250_ingenic.o +obj-$(CONFIG_SERIAL_8250_MID) += 8250_mid.o CFLAGS_8250_ingenic.o += -I$(srctree)/scripts/dtc/libfdt |