diff options
Diffstat (limited to 'arch/arm/plat-mxc/audmux-v2.c')
| -rw-r--r-- | arch/arm/plat-mxc/audmux-v2.c | 234 |
1 files changed, 234 insertions, 0 deletions
diff --git a/arch/arm/plat-mxc/audmux-v2.c b/arch/arm/plat-mxc/audmux-v2.c new file mode 100644 index 00000000..c36ddb34 --- /dev/null +++ b/arch/arm/plat-mxc/audmux-v2.c @@ -0,0 +1,234 @@ +/* + * Copyright 2009 Pengutronix, Sascha Hauer <s.hauer@pengutronix.de> + * + * Initial development of this code was funded by + * Phytec Messtechnik GmbH, http://www.phytec.de + * + * 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, or + * (at your option) any later version. + * + * 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. + */ + +#include <linux/module.h> +#include <linux/err.h> +#include <linux/io.h> +#include <linux/clk.h> +#include <linux/debugfs.h> +#include <linux/slab.h> +#include <mach/audmux.h> +#include <mach/hardware.h> + +static struct clk *audmux_clk; +static void __iomem *audmux_base; + +#define MXC_AUDMUX_V2_PTCR(x) ((x) * 8) +#define MXC_AUDMUX_V2_PDCR(x) ((x) * 8 + 4) + +#ifdef CONFIG_DEBUG_FS +static struct dentry *audmux_debugfs_root; + +static int audmux_open_file(struct inode *inode, struct file *file) +{ + file->private_data = inode->i_private; + return 0; +} + +/* There is an annoying discontinuity in the SSI numbering with regard + * to the Linux number of the devices */ +static const char *audmux_port_string(int port) +{ + switch (port) { + case MX31_AUDMUX_PORT1_SSI0: + return "imx-ssi.0"; + case MX31_AUDMUX_PORT2_SSI1: + return "imx-ssi.1"; + case MX31_AUDMUX_PORT3_SSI_PINS_3: + return "SSI3"; + case MX31_AUDMUX_PORT4_SSI_PINS_4: + return "SSI4"; + case MX31_AUDMUX_PORT5_SSI_PINS_5: + return "SSI5"; + case MX31_AUDMUX_PORT6_SSI_PINS_6: + return "SSI6"; + default: + return "UNKNOWN"; + } +} + +static ssize_t audmux_read_file(struct file *file, char __user *user_buf, + size_t count, loff_t *ppos) +{ + ssize_t ret; + char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL); + int port = (int)file->private_data; + u32 pdcr, ptcr; + + if (!buf) + return -ENOMEM; + + if (audmux_clk) + clk_enable(audmux_clk); + + ptcr = readl(audmux_base + MXC_AUDMUX_V2_PTCR(port)); + pdcr = readl(audmux_base + MXC_AUDMUX_V2_PDCR(port)); + + if (audmux_clk) + clk_disable(audmux_clk); + + ret = snprintf(buf, PAGE_SIZE, "PDCR: %08x\nPTCR: %08x\n", + pdcr, ptcr); + + if (ptcr & MXC_AUDMUX_V2_PTCR_TFSDIR) + ret += snprintf(buf + ret, PAGE_SIZE - ret, + "TxFS output from %s, ", + audmux_port_string((ptcr >> 27) & 0x7)); + else + ret += snprintf(buf + ret, PAGE_SIZE - ret, + "TxFS input, "); + + if (ptcr & MXC_AUDMUX_V2_PTCR_TCLKDIR) + ret += snprintf(buf + ret, PAGE_SIZE - ret, + "TxClk output from %s", + audmux_port_string((ptcr >> 22) & 0x7)); + else + ret += snprintf(buf + ret, PAGE_SIZE - ret, + "TxClk input"); + + ret += snprintf(buf + ret, PAGE_SIZE - ret, "\n"); + + if (ptcr & MXC_AUDMUX_V2_PTCR_SYN) { + ret += snprintf(buf + ret, PAGE_SIZE - ret, + "Port is symmetric"); + } else { + if (ptcr & MXC_AUDMUX_V2_PTCR_RFSDIR) + ret += snprintf(buf + ret, PAGE_SIZE - ret, + "RxFS output from %s, ", + audmux_port_string((ptcr >> 17) & 0x7)); + else + ret += snprintf(buf + ret, PAGE_SIZE - ret, + "RxFS input, "); + + if (ptcr & MXC_AUDMUX_V2_PTCR_RCLKDIR) + ret += snprintf(buf + ret, PAGE_SIZE - ret, + "RxClk output from %s", + audmux_port_string((ptcr >> 12) & 0x7)); + else + ret += snprintf(buf + ret, PAGE_SIZE - ret, + "RxClk input"); + } + + ret += snprintf(buf + ret, PAGE_SIZE - ret, + "\nData received from %s\n", + audmux_port_string((pdcr >> 13) & 0x7)); + + ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret); + + kfree(buf); + + return ret; +} + +static const struct file_operations audmux_debugfs_fops = { + .open = audmux_open_file, + .read = audmux_read_file, + .llseek = default_llseek, +}; + +static void audmux_debugfs_init(void) +{ + int i; + char buf[20]; + + audmux_debugfs_root = debugfs_create_dir("audmux", NULL); + if (!audmux_debugfs_root) { + pr_warning("Failed to create AUDMUX debugfs root\n"); + return; + } + + for (i = 1; i < 8; i++) { + snprintf(buf, sizeof(buf), "ssi%d", i); + if (!debugfs_create_file(buf, 0444, audmux_debugfs_root, + (void *)i, &audmux_debugfs_fops)) + pr_warning("Failed to create AUDMUX port %d debugfs file\n", + i); + } +} +#else +static inline void audmux_debugfs_init(void) +{ +} +#endif + +int mxc_audmux_v2_configure_port(unsigned int port, unsigned int ptcr, + unsigned int pdcr) +{ + if (!audmux_base) + return -ENOSYS; + + if (audmux_clk) + clk_enable(audmux_clk); + + writel(ptcr, audmux_base + MXC_AUDMUX_V2_PTCR(port)); + writel(pdcr, audmux_base + MXC_AUDMUX_V2_PDCR(port)); + + if (audmux_clk) + clk_disable(audmux_clk); + + return 0; +} +EXPORT_SYMBOL_GPL(mxc_audmux_v2_configure_port); + +static int mxc_audmux_v2_init(void) +{ + int ret = -1; + +#if defined(CONFIG_ARCH_MX6) + audmux_base = MX6_IO_ADDRESS(MX6Q_AUDMUX_BASE_ADDR); + ret = 0; +#endif +#if defined(CONFIG_ARCH_MX5) + if (cpu_is_mx51()) { + audmux_base = MX51_IO_ADDRESS(MX51_AUDMUX_BASE_ADDR); + ret = 0; + return ret; + } +#endif +#if defined(CONFIG_ARCH_MX3) + if (cpu_is_mx31()) + audmux_base = MX31_IO_ADDRESS(MX31_AUDMUX_BASE_ADDR); + + else if (cpu_is_mx35()) { + audmux_clk = clk_get(NULL, "audmux"); + if (IS_ERR(audmux_clk)) { + ret = PTR_ERR(audmux_clk); + printk(KERN_ERR "%s: cannot get clock: %d\n", __func__, + ret); + return ret; + } + audmux_base = MX35_IO_ADDRESS(MX35_AUDMUX_BASE_ADDR); + } +#endif +#if defined(CONFIG_SOC_IMX25) + if (cpu_is_mx25()) { + audmux_clk = clk_get(NULL, "audmux"); + if (IS_ERR(audmux_clk)) { + ret = PTR_ERR(audmux_clk); + printk(KERN_ERR "%s: cannot get clock: %d\n", __func__, + ret); + return ret; + } + audmux_base = MX25_IO_ADDRESS(MX25_AUDMUX_BASE_ADDR); + } +#endif /* if defined(CONFIG_SOC_IMX25) */ + audmux_debugfs_init(); + + return 0; +} + +postcore_initcall(mxc_audmux_v2_init); |