/* * Renesas Emma Mobile 8250 driver * * Copyright (C) 2012 Magnus Damm * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include #include #include #include #include #include #include #include #include "8250.h" #define UART_DLL_EM 9 #define UART_DLM_EM 10 struct serial8250_em_priv { struct clk *sclk; int line; }; static void serial8250_em_serial_out(struct uart_port *p, int offset, int value) { switch (offset) { case UART_TX: /* TX @ 0x00 */ writeb(value, p->membase); break; case UART_FCR: /* FCR @ 0x0c (+1) */ case UART_LCR: /* LCR @ 0x10 (+1) */ case UART_MCR: /* MCR @ 0x14 (+1) */ case UART_SCR: /* SCR @ 0x20 (+1) */ writel(value, p->membase + ((offset + 1) << 2)); break; case UART_IER: /* IER @ 0x04 */ value &= 0x0f; /* only 4 valid bits - not Xscale */ /* fall-through */ case UART_DLL_EM: /* DLL @ 0x24 (+9) */ case UART_DLM_EM: /* DLM @ 0x28 (+9) */ writel(value, p->membase + (offset << 2)); } } static unsigned int serial8250_em_serial_in(struct uart_port *p, int offset) { switch (offset) { case UART_RX: /* RX @ 0x00 */ return readb(p->membase); case UART_MCR: /* MCR @ 0x14 (+1) */ case UART_LSR: /* LSR @ 0x18 (+1) */ case UART_MSR: /* MSR @ 0x1c (+1) */ case UART_SCR: /* SCR @ 0x20 (+1) */ return readl(p->membase + ((offset + 1) << 2)); case UART_IER: /* IER @ 0x04 */ case UART_IIR: /* IIR @ 0x08 */ case UART_DLL_EM: /* DLL @ 0x24 (+9) */ case UART_DLM_EM: /* DLM @ 0x28 (+9) */ return readl(p->membase + (offset << 2)); } return 0; } static int serial8250_em_serial_dl_read(struct uart_8250_port *up) { return serial_in(up, UART_DLL_EM) | serial_in(up, UART_DLM_EM) << 8; } static void serial8250_em_serial_dl_write(struct uart_8250_port *up, int value) { serial_out(up, UART_DLL_EM, value & 0xff); serial_out(up, UART_DLM_EM, value >> 8 & 0xff); } static int serial8250_em_probe(struct platform_device *pdev) { struct resource *regs = platform_get_resource(pdev, IORESOURCE_MEM, 0); struct resource *irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0); struct serial8250_em_priv *priv; struct uart_8250_port up; int ret; if (!regs || !irq) { dev_err(&pdev->dev, "missing registers or irq\n"); return -EINVAL; } priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); if (!priv) return -ENOMEM; priv->sclk = devm_clk_get(&pdev->dev, "sclk"); if (IS_ERR(priv->sclk)) { dev_err(&pdev->dev, "unable to get clock\n"); return PTR_ERR(priv->sclk); } memset(&up, 0, sizeof(up)); up.port.mapbase = regs->start; up.port.irq = irq->start; up.port.type = PORT_UNKNOWN; up.port.flags = UPF_BOOT_AUTOCONF | UPF_FIXED_PORT | UPF_IOREMAP; up.port.dev = &pdev->dev; up.port.private_data = priv; clk_prepare_enable(priv->sclk); up.port.uartclk = clk_get_rate(priv->sclk); up.port.iotype = UPIO_MEM32; up.port.serial_in = serial8250_em_serial_in; up.port.serial_out = serial8250_em_serial_out; up.dl_read = serial8250_em_serial_dl_read; up.dl_write = serial8250_em_serial_dl_write; ret = serial8250_register_8250_port(&up); if (ret < 0) { dev_err(&pdev->dev, "unable to register 8250 port\n"); clk_disable_unprepare(priv->sclk); return ret; } priv->line = ret; platform_set_drvdata(pdev, priv); return 0; } static int serial8250_em_remove(struct platform_device *pdev) { struct serial8250_em_priv *priv = platform_get_drvdata(pdev); serial8250_unregister_port(priv->line); clk_disable_unprepare(priv->sclk); return 0; } static const struct of_device_id serial8250_em_dt_ids[] = { { .compatible = "renesas,em-uart", }, {}, }; MODULE_DEVICE_TABLE(of, serial8250_em_dt_ids); static struct platform_driver serial8250_em_platform_driver = { .driver = { .name = "serial8250-em", .of_match_table = serial8250_em_dt_ids, }, .probe = serial8250_em_probe, .remove = serial8250_em_remove, }; module_platform_driver(serial8250_em_platform_driver); MODULE_AUTHOR("Magnus Damm"); MODULE_DESCRIPTION("Renesas Emma Mobile 8250 Driver"); MODULE_LICENSE("GPL v2"); e34bac726d27056081d0250c0e173e4b155aa340 (diff)parent868c97a846a73e937d835b09b8c885a69df50ec8 (diff)
Merge tag 'docs-4.10' of git://git.lwn.net/linuxHEADmaster
Pull documentation update from Jonathan Corbet: "These are the documentation changes for 4.10. It's another busy cycle for the docs tree, as the sphinx conversion continues. Highlights include: - Further work on PDF output, which remains a bit of a pain but should be more solid now. - Five more DocBook template files converted to Sphinx. Only 27 to go... Lots of plain-text files have also been converted and integrated. - Images in binary formats have been replaced with more source-friendly versions. - Various bits of organizational work, including the renaming of various files discussed at the kernel summit. - New documentation for the device_link mechanism. ... and, of course, lots of typo fixes and small updates" * tag 'docs-4.10' of git://git.lwn.net/linux: (193 commits) dma-buf: Extract dma-buf.rst Update Documentation/00-INDEX docs: 00-INDEX: document directories/files with no docs docs: 00-INDEX: remove non-existing entries docs: 00-INDEX: add missing entries for documentation files/dirs docs: 00-INDEX: consolidate process/ and admin-guide/ description scripts: add a script to check if Documentation/00-INDEX is sane Docs: change sh -> awk in REPORTING-BUGS Documentation/core-api/device_link: Add initial documentation core-api: remove an unexpected unident ppc/idle: Add documentation for powersave=off Doc: Correct typo, "Introdution" => "Introduction" Documentation/atomic_ops.txt: convert to ReST markup Documentation/local_ops.txt: convert to ReST markup Documentation/assoc_array.txt: convert to ReST markup docs-rst: parse-headers.pl: cleanup the documentation docs-rst: fix media cleandocs target docs-rst: media/Makefile: reorganize the rules docs-rst: media: build SVG from graphviz files docs-rst: replace bayer.png by a SVG image ...
Diffstat (limited to 'net/ax25/ax25_ds_subr.c')