platform模型驱动中断和内存资源使用步骤

IO 内存资源使用步骤

/* io memory */

res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

if (!res) {

dev_err(&pdev->dev, "failed to get io memory region\n");

ret = -EINVAL;

goto err_clk_disable;

}

/* request mem region */

res = request_mem_region(res->start,res->end - res->start + 1, pdev->name);

if (!res) {

dev_err(&pdev->dev, "failed to request io memory region\n");

ret = -EINVAL;

goto err_clk_disable;

}

/* ioremap for register block */

dsim.reg_base = (unsigned int) ioremap(res->start,res->end - res->start + 1);

if (!dsim.reg_base) {

dev_err(&pdev->dev, "failed to remap io region\n");

ret = -EINVAL;

goto err_clk_disable;

中断资源使用步骤

res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);

if (!res) {

dev_err(&pdev->dev, "failed to request dsim irq resource\n");

ret = -EINVAL;

goto err_clk_disable;

}

/* dsim.irq = res->start; */

/* clear interrupt */

/* int_stat = readl(dsim.reg_base + S5P_DSIM_INTSRC); */

int_stat = 0xffffffff;

writel(int_stat, dsim.reg_base + S5P_DSIM_INTSRC);

/* enable interrupts */

int_stat = readl(dsim.reg_base + S5P_DSIM_INTMSK);

int_stat &= ~((0x01<<S5P_DSIM_INT_BTA) | (0x01<<S5P_DSIM_INT_RX_TIMEOUT) |

(0x01<<S5P_DSIM_INT_BTA_TIMEOUT) | (0x01 << S5P_DSIM_INT_RX_DONE) |

(0x01<<S5P_DSIM_INT_RX_TE) | (0x01<<S5P_DSIM_INT_RX_ACK) |

(0x01<<S5P_DSIM_INT_RX_ECC_ERR) | (0x01<<S5P_DSIM_IMT_RX_CRC_ERR) |

(0x01<<S5P_DSIM_INT_SFR_FIFO_EMPTY));

writel(int_stat, dsim.reg_base + S5P_DSIM_INTMSK);

ret = request_irq(res->start, (void *)s5p_dsim_isr, IRQF_DISABLED, pdev->name, &dsim);

if (ret != 0) {

dev_err(&pdev->dev, "failed to request dsim irq\n");

ret = -EINVAL;

goto err_clk_disable;

}