From 76cb841cb886eef6b3bee341a2266c76578724ad Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Mon, 6 May 2024 03:02:30 +0200 Subject: Adding upstream version 4.19.249. Signed-off-by: Daniel Baumann --- drivers/mfd/mcp-sa11x0.c | 314 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 314 insertions(+) create mode 100644 drivers/mfd/mcp-sa11x0.c (limited to 'drivers/mfd/mcp-sa11x0.c') diff --git a/drivers/mfd/mcp-sa11x0.c b/drivers/mfd/mcp-sa11x0.c new file mode 100644 index 000000000..1fc458128 --- /dev/null +++ b/drivers/mfd/mcp-sa11x0.c @@ -0,0 +1,314 @@ +/* + * linux/drivers/mfd/mcp-sa11x0.c + * + * Copyright (C) 2001-2005 Russell King + * + * 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. + * + * SA11x0 MCP (Multimedia Communications Port) driver. + * + * MCP read/write timeouts from Jordi Colomer, rehacked by rmk. + */ +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include + +#define DRIVER_NAME "sa11x0-mcp" + +struct mcp_sa11x0 { + void __iomem *base0; + void __iomem *base1; + u32 mccr0; + u32 mccr1; +}; + +/* Register offsets */ +#define MCCR0(m) ((m)->base0 + 0x00) +#define MCDR0(m) ((m)->base0 + 0x08) +#define MCDR1(m) ((m)->base0 + 0x0c) +#define MCDR2(m) ((m)->base0 + 0x10) +#define MCSR(m) ((m)->base0 + 0x18) +#define MCCR1(m) ((m)->base1 + 0x00) + +#define priv(mcp) ((struct mcp_sa11x0 *)mcp_priv(mcp)) + +static void +mcp_sa11x0_set_telecom_divisor(struct mcp *mcp, unsigned int divisor) +{ + struct mcp_sa11x0 *m = priv(mcp); + + divisor /= 32; + + m->mccr0 &= ~0x00007f00; + m->mccr0 |= divisor << 8; + writel_relaxed(m->mccr0, MCCR0(m)); +} + +static void +mcp_sa11x0_set_audio_divisor(struct mcp *mcp, unsigned int divisor) +{ + struct mcp_sa11x0 *m = priv(mcp); + + divisor /= 32; + + m->mccr0 &= ~0x0000007f; + m->mccr0 |= divisor; + writel_relaxed(m->mccr0, MCCR0(m)); +} + +/* + * Write data to the device. The bit should be set after 3 subframe + * times (each frame is 64 clocks). We wait a maximum of 6 subframes. + * We really should try doing something more productive while we + * wait. + */ +static void +mcp_sa11x0_write(struct mcp *mcp, unsigned int reg, unsigned int val) +{ + struct mcp_sa11x0 *m = priv(mcp); + int ret = -ETIME; + int i; + + writel_relaxed(reg << 17 | MCDR2_Wr | (val & 0xffff), MCDR2(m)); + + for (i = 0; i < 2; i++) { + udelay(mcp->rw_timeout); + if (readl_relaxed(MCSR(m)) & MCSR_CWC) { + ret = 0; + break; + } + } + + if (ret < 0) + printk(KERN_WARNING "mcp: write timed out\n"); +} + +/* + * Read data from the device. The bit should be set after 3 subframe + * times (each frame is 64 clocks). We wait a maximum of 6 subframes. + * We really should try doing something more productive while we + * wait. + */ +static unsigned int +mcp_sa11x0_read(struct mcp *mcp, unsigned int reg) +{ + struct mcp_sa11x0 *m = priv(mcp); + int ret = -ETIME; + int i; + + writel_relaxed(reg << 17 | MCDR2_Rd, MCDR2(m)); + + for (i = 0; i < 2; i++) { + udelay(mcp->rw_timeout); + if (readl_relaxed(MCSR(m)) & MCSR_CRC) { + ret = readl_relaxed(MCDR2(m)) & 0xffff; + break; + } + } + + if (ret < 0) + printk(KERN_WARNING "mcp: read timed out\n"); + + return ret; +} + +static void mcp_sa11x0_enable(struct mcp *mcp) +{ + struct mcp_sa11x0 *m = priv(mcp); + + writel(-1, MCSR(m)); + m->mccr0 |= MCCR0_MCE; + writel_relaxed(m->mccr0, MCCR0(m)); +} + +static void mcp_sa11x0_disable(struct mcp *mcp) +{ + struct mcp_sa11x0 *m = priv(mcp); + + m->mccr0 &= ~MCCR0_MCE; + writel_relaxed(m->mccr0, MCCR0(m)); +} + +/* + * Our methods. + */ +static struct mcp_ops mcp_sa11x0 = { + .set_telecom_divisor = mcp_sa11x0_set_telecom_divisor, + .set_audio_divisor = mcp_sa11x0_set_audio_divisor, + .reg_write = mcp_sa11x0_write, + .reg_read = mcp_sa11x0_read, + .enable = mcp_sa11x0_enable, + .disable = mcp_sa11x0_disable, +}; + +static int mcp_sa11x0_probe(struct platform_device *dev) +{ + struct mcp_plat_data *data = dev_get_platdata(&dev->dev); + struct resource *mem0, *mem1; + struct mcp_sa11x0 *m; + struct mcp *mcp; + int ret; + + if (!data) + return -ENODEV; + + mem0 = platform_get_resource(dev, IORESOURCE_MEM, 0); + mem1 = platform_get_resource(dev, IORESOURCE_MEM, 1); + if (!mem0 || !mem1) + return -ENXIO; + + if (!request_mem_region(mem0->start, resource_size(mem0), + DRIVER_NAME)) { + ret = -EBUSY; + goto err_mem0; + } + + if (!request_mem_region(mem1->start, resource_size(mem1), + DRIVER_NAME)) { + ret = -EBUSY; + goto err_mem1; + } + + mcp = mcp_host_alloc(&dev->dev, sizeof(struct mcp_sa11x0)); + if (!mcp) { + ret = -ENOMEM; + goto err_alloc; + } + + mcp->owner = THIS_MODULE; + mcp->ops = &mcp_sa11x0; + mcp->sclk_rate = data->sclk_rate; + + m = priv(mcp); + m->mccr0 = data->mccr0 | 0x7f7f; + m->mccr1 = data->mccr1; + + m->base0 = ioremap(mem0->start, resource_size(mem0)); + m->base1 = ioremap(mem1->start, resource_size(mem1)); + if (!m->base0 || !m->base1) { + ret = -ENOMEM; + goto err_ioremap; + } + + platform_set_drvdata(dev, mcp); + + /* + * Initialise device. Note that we initially + * set the sampling rate to minimum. + */ + writel_relaxed(-1, MCSR(m)); + writel_relaxed(m->mccr1, MCCR1(m)); + writel_relaxed(m->mccr0, MCCR0(m)); + + /* + * Calculate the read/write timeout (us) from the bit clock + * rate. This is the period for 3 64-bit frames. Always + * round this time up. + */ + mcp->rw_timeout = (64 * 3 * 1000000 + mcp->sclk_rate - 1) / + mcp->sclk_rate; + + ret = mcp_host_add(mcp, data->codec_pdata); + if (ret == 0) + return 0; + + err_ioremap: + iounmap(m->base1); + iounmap(m->base0); + mcp_host_free(mcp); + err_alloc: + release_mem_region(mem1->start, resource_size(mem1)); + err_mem1: + release_mem_region(mem0->start, resource_size(mem0)); + err_mem0: + return ret; +} + +static int mcp_sa11x0_remove(struct platform_device *dev) +{ + struct mcp *mcp = platform_get_drvdata(dev); + struct mcp_sa11x0 *m = priv(mcp); + struct resource *mem0, *mem1; + + if (m->mccr0 & MCCR0_MCE) + dev_warn(&dev->dev, + "device left active (missing disable call?)\n"); + + mem0 = platform_get_resource(dev, IORESOURCE_MEM, 0); + mem1 = platform_get_resource(dev, IORESOURCE_MEM, 1); + + mcp_host_del(mcp); + iounmap(m->base1); + iounmap(m->base0); + mcp_host_free(mcp); + release_mem_region(mem1->start, resource_size(mem1)); + release_mem_region(mem0->start, resource_size(mem0)); + + return 0; +} + +#ifdef CONFIG_PM_SLEEP +static int mcp_sa11x0_suspend(struct device *dev) +{ + struct mcp_sa11x0 *m = priv(dev_get_drvdata(dev)); + + if (m->mccr0 & MCCR0_MCE) + dev_warn(dev, "device left active (missing disable call?)\n"); + + writel(m->mccr0 & ~MCCR0_MCE, MCCR0(m)); + + return 0; +} + +static int mcp_sa11x0_resume(struct device *dev) +{ + struct mcp_sa11x0 *m = priv(dev_get_drvdata(dev)); + + writel_relaxed(m->mccr1, MCCR1(m)); + writel_relaxed(m->mccr0, MCCR0(m)); + + return 0; +} +#endif + +static const struct dev_pm_ops mcp_sa11x0_pm_ops = { +#ifdef CONFIG_PM_SLEEP + .suspend = mcp_sa11x0_suspend, + .freeze = mcp_sa11x0_suspend, + .poweroff = mcp_sa11x0_suspend, + .resume_noirq = mcp_sa11x0_resume, + .thaw_noirq = mcp_sa11x0_resume, + .restore_noirq = mcp_sa11x0_resume, +#endif +}; + +static struct platform_driver mcp_sa11x0_driver = { + .probe = mcp_sa11x0_probe, + .remove = mcp_sa11x0_remove, + .driver = { + .name = DRIVER_NAME, + .pm = &mcp_sa11x0_pm_ops, + }, +}; + +/* + * This needs re-working + */ +module_platform_driver(mcp_sa11x0_driver); + +MODULE_ALIAS("platform:" DRIVER_NAME); +MODULE_AUTHOR("Russell King "); +MODULE_DESCRIPTION("SA11x0 multimedia communications port driver"); +MODULE_LICENSE("GPL"); -- cgit v1.2.3