cregit-Linux how code gets into the kernel

Release 4.7 drivers/tty/serial/8250/8250_em.c

/*
 * 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 <linux/device.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/serial_8250.h>
#include <linux/serial_reg.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/slab.h>

#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)); } }

Contributors

PersonTokensPropCommitsCommitProp
magnus dammmagnus damm106100.00%1100.00%
Total106100.00%1100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
magnus dammmagnus damm100100.00%1100.00%
Total100100.00%1100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
magnus dammmagnus damm28100.00%1100.00%
Total28100.00%1100.00%


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); }

Contributors

PersonTokensPropCommitsCommitProp
magnus dammmagnus damm38100.00%1100.00%
Total38100.00%1100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
magnus dammmagnus damm29992.00%250.00%
laurent pinchartlaurent pinchart247.38%125.00%
shinya kuribayashishinya kuribayashi20.62%125.00%
Total325100.00%4100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
magnus dammmagnus damm3797.37%150.00%
shinya kuribayashishinya kuribayashi12.63%150.00%
Total38100.00%2100.00%

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");

Overall Contributors

PersonTokensPropCommitsCommitProp
magnus dammmagnus damm73496.45%360.00%
laurent pinchartlaurent pinchart243.15%120.00%
shinya kuribayashishinya kuribayashi30.39%120.00%
bill pembertonbill pemberton0.00%00.00%
Total761100.00%5100.00%
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
{% endraw %}