/* * twl4030_core.c - driver for TWL4030/TPS659x0 PM and audio CODEC devices * * Copyright (C) 2005-2006 Texas Instruments, Inc. * * Modifications to defer interrupt handling to a kernel thread: * Copyright (C) 2006 MontaVista Software, Inc. * * Based on tlv320aic23.c: * Copyright (c) by Kai Svahn * * Code cleanup and modifications to IRQ handler. * by syed khasim * * 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. * * 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 #include #include /* * The TWL4030 "Triton 2" is one of a family of a multi-function "Power * Management and System Companion Device" chips originally designed for * use in OMAP2 and OMAP 3 based systems. Its control interfaces use I2C, * often at around 3 Mbit/sec, including for interrupt handling. * * This driver core provides genirq support for the interrupts emitted, * by the various modules, and exports register access primitives. * * FIXME this driver currently requires use of the first interrupt line * (and associated registers). */ #define DRIVER_NAME "twl4030" #if defined(CONFIG_TWL4030_BCI_BATTERY) || \ defined(CONFIG_TWL4030_BCI_BATTERY_MODULE) #define twl_has_bci() true #else #define twl_has_bci() false #endif #if defined(CONFIG_KEYBOARD_TWL4030) || defined(CONFIG_KEYBOARD_TWL4030_MODULE) #define twl_has_keypad() true #else #define twl_has_keypad() false #endif #if defined(CONFIG_GPIO_TWL4030) || defined(CONFIG_GPIO_TWL4030_MODULE) #define twl_has_gpio() true #else #define twl_has_gpio() false #endif #if defined(CONFIG_TWL4030_MADC) || defined(CONFIG_TWL4030_MADC_MODULE) #define twl_has_madc() true #else #define twl_has_madc() false #endif #if defined(CONFIG_RTC_DRV_TWL4030) || defined(CONFIG_RTC_DRV_TWL4030_MODULE) #define twl_has_rtc() true #else #define twl_has_rtc() false #endif #if defined(CONFIG_TWL4030_USB) || defined(CONFIG_TWL4030_USB_MODULE) #define twl_has_usb() true #else #define twl_has_usb() false #endif static inline void activate_irq(int irq) { #ifdef CONFIG_ARM /* ARM requires an extra step to clear IRQ_NOREQUEST, which it * sets on behalf of every irq_chip. Also sets IRQ_NOPROBE. */ set_irq_flags(irq, IRQF_VALID); #else /* same effect on other architectures */ set_irq_noprobe(irq); #endif } /* Primary Interrupt Handler on TWL4030 Registers */ /* Register Definitions */ #define REG_PIH_ISR_P1 (0x1) #define REG_PIH_ISR_P2 (0x2) #define REG_PIH_SIR (0x3) /* Triton Core internal information (BEGIN) */ /* Last - for index max*/ #define TWL4030_MODULE_LAST TWL4030_MODULE_SECURED_REG #define TWL4030_NUM_SLAVES 4 /* Base Address defns for twl4030_map[] */ /* subchip/slave 0 - USB ID */ #define TWL4030_BASEADD_USB 0x0000 /* subchip/slave 1 - AUD ID */ #define TWL4030_BASEADD_AUDIO_VOICE 0x0000 #define TWL4030_BASEADD_GPIO 0x0098 #define TWL4030_BASEADD_INTBR 0x0085 #define TWL4030_BASEADD_PIH 0x0080 #define TWL4030_BASEADD_TEST 0x004C /* subchip/slave 2 - AUX ID */ #define TWL4030_BASEADD_INTERRUPTS 0x00B9 #define TWL4030_BASEADD_LED 0x00EE #define TWL4030_BASEADD_MADC 0x0000 #define TWL4030_BASEADD_MAIN_CHARGE 0x0074 #define TWL4030_BASEADD_PRECHARGE 0x00AA #define TWL4030_BASEADD_PWM0 0x00F8 #define TWL4030_BASEADD_PWM1 0x00FB #define TWL4030_BASEADD_PWMA 0x00EF #define TWL4030_BASEADD_PWMB 0x00F1 #define TWL4030_BASEADD_KEYPAD 0x00D2 /* subchip/slave 3 - POWER ID */ #define TWL4030_BASEADD_BACKUP 0x0014 #define TWL4030_BASEADD_INT 0x002E #define TWL4030_BASEADD_PM_MASTER 0x0036 #define TWL4030_BASEADD_PM_RECEIVER 0x005B #define TWL4030_BASEADD_RTC 0x001C #define TWL4030_BASEADD_SECURED_REG 0x0000 /* Triton Core internal information (END) */ /* Few power values */ #define R_CFG_BOOT 0x05 #define R_PROTECT_KEY 0x0E /* access control values for R_PROTECT_KEY */ #define KEY_UNLOCK1 0xce #define KEY_UNLOCK2 0xec #define KEY_LOCK 0x00 /* some fields in R_CFG_BOOT */ #define HFCLK_FREQ_19p2_MHZ (1 << 0) #define HFCLK_FREQ_26_MHZ (2 << 0) #define HFCLK_FREQ_38p4_MHZ (3 << 0) #define HIGH_PERF_SQ (1 << 3) /*----------------------------------------------------------------------*/ /** * struct twl4030_mod_iregs - TWL module IMR/ISR regs to mask/clear at init * @mod_no: TWL4030 module number (e.g., TWL4030_MODULE_GPIO) * @sih_ctrl: address of module SIH_CTRL register * @reg_cnt: number of IMR/ISR regs * @imrs: pointer to array of TWL module interrupt mask register indices * @isrs: pointer to array of TWL module interrupt status register indices * * Ties together TWL4030 modules and lists of IMR/ISR registers to mask/clear * during twl_init_irq(). */ struct twl4030_mod_iregs { const u8 mod_no; const u8 sih_ctrl; const u8 reg_cnt; const u8 *imrs; const u8 *isrs; }; /* TWL4030 INT module interrupt mask registers */ static const u8 __initconst twl4030_int_imr_regs[] = { TWL4030_INT_PWR_IMR1, TWL4030_INT_PWR_IMR2, }; /* TWL4030 INT module interrupt status registers */ static const u8 __initconst twl4030_int_isr_regs[] = { TWL4030_INT_PWR_ISR1, TWL4030_INT_PWR_ISR2, }; /* TWL4030 INTERRUPTS module interrupt mask registers */ static const u8 __initconst twl4030_interrupts_imr_regs[] = { TWL4030_INTERRUPTS_BCIIMR1A, TWL4030_INTERRUPTS_BCIIMR1B, TWL4030_INTERRUPTS_BCIIMR2A, TWL4030_INTERRUPTS_BCIIMR2B, }; /* TWL4030 INTERRUPTS module interrupt status registers */ static const u8 __initconst twl4030_interrupts_isr_regs[] = { TWL4030_INTERRUPTS_BCIISR1A, TWL4030_INTERRUPTS_BCIISR1B, TWL4030_INTERRUPTS_BCIISR2A, TWL4030_INTERRUPTS_BCIISR2B, }; /* TWL4030 MADC module interrupt mask registers */ static const u8 __initconst twl4030_madc_imr_regs[] = { TWL4030_MADC_IMR1, TWL4030_MADC_IMR2, }; /* TWL4030 MADC module interrupt status registers */ static const u8 __initconst twl4030_madc_isr_regs[] = { TWL4030_MADC_ISR1, TWL4030_MADC_ISR2, }; /* TWL4030 keypad module interrupt mask registers */ static const u8 __initconst twl4030_keypad_imr_regs[] = { TWL4030_KEYPAD_KEYP_IMR1, TWL4030_KEYPAD_KEYP_IMR2, }; /* TWL4030 keypad module interrupt status registers */ static const u8 __initconst twl4030_keypad_isr_regs[] = { TWL4030_KEYPAD_KEYP_ISR1, TWL4030_KEYPAD_KEYP_ISR2, }; /* TWL4030 GPIO module interrupt mask registers */ static const u8 __initconst twl4030_gpio_imr_regs[] = { REG_GPIO_IMR1A, REG_GPIO_IMR1B, REG_GPIO_IMR2A, REG_GPIO_IMR2B, REG_GPIO_IMR3A, REG_GPIO_IMR3B, }; /* TWL4030 GPIO module interrupt status registers */ static const u8 __initconst twl4030_gpio_isr_regs[] = { REG_GPIO_ISR1A, REG_GPIO_ISR1B, REG_GPIO_ISR2A, REG_GPIO_ISR2B, REG_GPIO_ISR3A, REG_GPIO_ISR3B, }; /* TWL4030 modules that have IMR/ISR registers that must be masked/cleared */ static const struct twl4030_mod_iregs __initconst twl4030_mod_regs[] = { { .mod_no = TWL4030_MODULE_INT, .sih_ctrl = TWL4030_INT_PWR_SIH_CTRL, .reg_cnt = ARRAY_SIZE(twl4030_int_imr_regs), .imrs = twl4030_int_imr_regs, .isrs = twl4030_int_isr_regs, }, { .mod_no = TWL4030_MODULE_INTERRUPTS, .sih_ctrl = TWL4030_INTERRUPTS_BCISIHCTRL, .reg_cnt = ARRAY_SIZE(twl4030_interrupts_imr_regs), .imrs = twl4030_interrupts_imr_regs, .isrs = twl4030_interrupts_isr_regs, }, { .mod_no = TWL4030_MODULE_MADC, .sih_ctrl = TWL4030_MADC_SIH_CTRL, .reg_cnt = ARRAY_SIZE(twl4030_madc_imr_regs), .imrs = twl4030_madc_imr_regs, .isrs = twl4030_madc_isr_regs, }, { .mod_no = TWL4030_MODULE_KEYPAD, .sih_ctrl = TWL4030_KEYPAD_KEYP_SIH_CTRL, .reg_cnt = ARRAY_SIZE(twl4030_keypad_imr_regs), .imrs = twl4030_keypad_imr_regs, .isrs = twl4030_keypad_isr_regs, }, { .mod_no = TWL4030_MODULE_GPIO, .sih_ctrl = REG_GPIO_SIH_CTRL, .reg_cnt = ARRAY_SIZE(twl4030_gpio_imr_regs), .imrs = twl4030_gpio_imr_regs, .isrs = twl4030_gpio_isr_regs, }, }; /*----------------------------------------------------------------*/ /* is driver active, bound to a chip? */ static bool inuse; /* Structure for each TWL4030 Slave */ struct twl4030_client { struct i2c_client *client; u8 address; /* max numb of i2c_msg required is for read =2 */ struct i2c_msg xfer_msg[2]; /* To lock access to xfer_msg */ struct mutex xfer_lock; }; static struct twl4030_client twl4030_modules[TWL4030_NUM_SLAVES]; /* mapping the module id to slave id and base address */ struct twl4030mapping { unsigned char sid; /* Slave ID */ unsigned char base; /* base address */ }; static struct twl4030mapping twl4030_map[TWL4030_MODULE_LAST + 1] = { /* * NOTE: don't change this table without updating the * defines for TWL4030_MODULE_* * so they continue to match the order in this table. */ { 0, TWL4030_BASEADD_USB }, { 1, TWL4030_BASEADD_AUDIO_VOICE }, { 1, TWL4030_BASEADD_GPIO }, { 1, TWL4030_BASEADD_INTBR }, { 1, TWL4030_BASEADD_PIH }, { 1, TWL4030_BASEADD_TEST }, { 2, TWL4030_BASEADD_KEYPAD }, { 2, TWL4030_BASEADD_MADC }, { 2, TWL4030_BASEADD_INTERRUPTS }, { 2, TWL4030_BASEADD_LED }, { 2, TWL4030_BASEADD_MAIN_CHARGE }, { 2, TWL4030_BASEADD_PRECHARGE }, { 2, TWL4030_BASEADD_PWM0 }, { 2, TWL4030_BASEADD_PWM1 }, { 2, TWL4030_BASEADD_PWMA }, { 2, TWL4030_BASEADD_PWMB }, { 3, TWL4030_BASEADD_BACKUP }, { 3, TWL4030_BASEADD_INT }, { 3, TWL4030_BASEADD_PM_MASTER }, { 3, TWL4030_BASEADD_PM_RECEIVER }, { 3, TWL4030_BASEADD_RTC }, { 3, TWL4030_BASEADD_SECURED_REG }, }; /*----------------------------------------------------------------------*/ /* * TWL4030 doesn't have PIH mask, hence dummy function for mask * and unmask of the (eight) interrupts reported at that level ... * masking is only available from SIH (secondary) modules. */ static void twl4030_i2c_ackirq(unsigned int irq) { } static void twl4030_i2c_disableint(unsigned int irq) { } static void twl4030_i2c_enableint(unsigned int irq) { } static struct irq_chip twl4030_irq_chip = { .name = "twl4030", .ack = twl4030_i2c_ackirq, .mask = twl4030_i2c_disableint, .unmask = twl4030_i2c_enableint, }; /*----------------------------------------------------------------------*/ /* Exported Functions */ /** * twl4030_i2c_write - Writes a n bit register in TWL4030 * @mod_no: module number * @value: an array of num_bytes+1 containing data to write * @reg: register address (just offset will do) * @num_bytes: number of bytes to transfer * * IMPORTANT: for 'value' parameter: Allocate value num_bytes+1 and * valid data starts at Offset 1. * * Returns the result of operation - 0 is success */ int twl4030_i2c_write(u8 mod_no, u8 *value, u8 reg, u8 num_bytes) { int ret; int sid; struct twl4030_client *twl; struct i2c_msg *msg; if (unlikely(mod_no > TWL4030_MODULE_LAST)) { pr_err("%s: invalid module number %d\n", DRIVER_NAME, mod_no); return -EPERM; } sid = twl4030_map[mod_no].sid; twl = &twl4030_modules[sid]; if (unlikely(!inuse)) { pr_err("%s: client %d is not initialized\n", DRIVER_NAME, sid); return -EPERM; } mutex_lock(&twl->xfer_lock); /* * [MSG1]: fill the register address data * fill the data Tx buffer */ msg = &twl->xfer_msg[0]; msg->addr = twl->address; msg->len = num_bytes + 1; msg->flags = 0; msg->buf = value; /* over write the first byte of buffer with the register address */ *value = twl4030_map[mod_no].base + reg; ret = i2c_transfer(twl->client->adapter, twl->xfer_msg, 1); mutex_unlock(&twl->xfer_lock); /* i2cTransfer returns num messages.translate it pls.. */ if (ret >= 0) ret = 0; return ret; } EXPORT_SYMBOL(twl4030_i2c_write); /** * twl4030_i2c_read - Reads a n bit register in TWL4030 * @mod_no: module number * @value: an array of num_bytes containing data to be read * @reg: register address (just offset will do) * @num_bytes: number of bytes to transfer * * Returns result of operation - num_bytes is success else failure. */ int twl4030_i2c_read(u8 mod_no, u8 *value, u8 reg, u8 num_bytes) { int ret; u8 val; int sid; struct twl4030_client *twl; struct i2c_msg *msg; if (unlikely(mod_no > TWL4030_MODULE_LAST)) { pr_err("%s: invalid module number %d\n", DRIVER_NAME, mod_no); return -EPERM; } sid = twl4030_map[mod_no].sid; twl = &twl4030_modules[sid]; if (unlikely(!inuse)) { pr_err("%s: client %d is not initialized\n", DRIVER_NAME, sid); return -EPERM; } mutex_lock(&twl->xfer_lock); /* [MSG1] fill the register address data */ msg = &twl->xfer_msg[0]; msg->addr = twl->address; msg->len = 1; msg->flags = 0; /* Read the register value */ val = twl4030_map[mod_no].base + reg; msg->buf = &val; /* [MSG2] fill the data rx buffer */ msg = &twl->xfer_msg[1]; msg->addr = twl->address; msg->flags = I2C_M_RD; /* Read the register value */ msg->len = num_bytes; /* only n bytes */ msg->buf = value; ret = i2c_transfer(twl->client->adapter, twl->xfer_msg, 2); mutex_unlock(&twl->xfer_lock); /* i2cTransfer returns num messages.translate it pls.. */ if (ret >= 0) ret = 0; return ret; } EXPORT_SYMBOL(twl4030_i2c_read); /** * twl4030_i2c_write_u8 - Writes a 8 bit register in TWL4030 * @mod_no: module number * @value: the value to be written 8 bit * @reg: register address (just offset will do) * * Returns result of operation - 0 is success */ int twl4030_i2c_write_u8(u8 mod_no, u8 value, u8 reg) { /* 2 bytes offset 1 contains the data offset 0 is used by i2c_write */ u8 temp_buffer[2] = { 0 }; /* offset 1 contains the data */ temp_buffer[1] = value; return twl4030_i2c_write(mod_no, temp_buffer, reg, 1); } EXPORT_SYMBOL(twl4030_i2c_write_u8); /** * twl4030_i2c_read_u8 - Reads a 8 bit register from TWL4030 * @mod_no: module number * @value: the value read 8 bit * @reg: register address (just offset will do) * * Returns result of operation - 0 is success */ int twl4030_i2c_read_u8(u8 mod_no, u8 *value, u8 reg) { return twl4030_i2c_read(mod_no, value, reg, 1); } EXPORT_SYMBOL(twl4030_i2c_read_u8); /*----------------------------------------------------------------------*/ static unsigned twl4030_irq_base; static struct completion irq_event; /* * This thread processes interrupts reported by the Primary Interrupt Handler. */ static int twl4030_irq_thread(void *data) { long irq = (long)data; irq_desc_t *desc = irq_desc + irq; static unsigned i2c_errors; const static unsigned max_i2c_errors = 100; current->flags |= PF_NOFREEZE; while (!kthread_should_stop()) { int ret; int module_irq; u8 pih_isr; /* Wait for IRQ, then read PIH irq status (also blocking) */ wait_for_completion_interruptible(&irq_event); ret = twl4030_i2c_read_u8(TWL4030_MODULE_PIH, &pih_isr, REG_PIH_ISR_P1); if (ret) { pr_warning("%s: I2C error %d reading PIH ISR\n", DRIVER_NAME, ret); if (++i2c_errors >= max_i2c_errors) { printk(KERN_ERR "Maximum I2C error count" " exceeded. Terminating %s.\n", __func__); break; } complete(&irq_event); continue; } /* these handlers deal with the relevant SIH irq status */ local_irq_disable(); for (module_irq = twl4030_irq_base; pih_isr; pih_isr >>= 1, module_irq++) { if (pih_isr & 0x1) { irq_desc_t *d = irq_desc + module_irq; d->handle_irq(module_irq, d); } } local_irq_enable(); desc->chip->unmask(irq); } return 0; } /* * do_twl4030_irq() is the desc->handle method for the twl4030 interrupt. * This is a chained interrupt, so there is no desc->action method for it. * Now we need to query the interrupt controller in the twl4030 to determine * which module is generating the interrupt request. However, we can't do i2c * transactions in interrupt context, so we must defer that work to a kernel * thread. All we do here is acknowledge and mask the interrupt and wakeup * the kernel thread. */ static void do_twl4030_irq(unsigned int irq, irq_desc_t *desc) { const unsigned int cpu = smp_processor_id(); /* * Earlier this was desc->triggered = 1; */ desc->status |= IRQ_LEVEL; /* * Acknowledge, clear _AND_ disable the interrupt. */ desc->chip->ack(irq); if (!desc->depth) { kstat_cpu(cpu).irqs[irq]++; complete(&irq_event); } } static struct task_struct * __init start_twl4030_irq_thread(long irq) { struct task_struct *thread; init_completion(&irq_event); thread = kthread_run(twl4030_irq_thread, (void *)irq, "twl4030-irq"); if (!thread) pr_err("%s: could not create twl4030 irq %ld thread!\n", DRIVER_NAME, irq); return thread; } /*----------------------------------------------------------------------*/ static int add_children(struct twl4030_platform_data *pdata) { struct platform_device *pdev = NULL; struct twl4030_client *twl = NULL; int status = 0; if (twl_has_bci() && pdata->bci) { twl = &twl4030_modules[3]; pdev = platform_device_alloc("twl4030_bci", -1); if (!pdev) { pr_debug("%s: can't alloc bci dev\n", DRIVER_NAME); status = -ENOMEM; goto err; } if (status == 0) { pdev->dev.parent = &twl->client->dev; status = platform_device_add_data(pdev, pdata->bci, sizeof(*pdata->bci)); if (status < 0) { dev_dbg(&twl->client->dev, "can't add bci data, %d\n", status); goto err; } } if (status == 0) { struct resource r = { .start = TWL4030_PWRIRQ_CHG_PRES, .flags = IORESOURCE_IRQ, }; status = platform_device_add_resources(pdev, &r, 1); } if (status == 0) status = platform_device_add(pdev); if (status < 0) { platform_device_put(pdev); dev_dbg(&twl->client->dev, "can't create bci dev, %d\n", status); goto err; } } if (twl_has_gpio() && pdata->gpio) { twl = &twl4030_modules[1]; pdev = platform_device_alloc("twl4030_gpio", -1); if (!pdev) { pr_debug("%s: can't alloc gpio dev\n", DRIVER_NAME); status = -ENOMEM; goto err; } /* more driver model init */ if (status == 0) { pdev->dev.parent = &twl->client->dev; /* device_init_wakeup(&pdev->dev, 1); */ status = platform_device_add_data(pdev, pdata->gpio, sizeof(*pdata->gpio)); if (status < 0) { dev_dbg(&twl->client->dev, "can't add gpio data, %d\n", status); goto err; } } /* GPIO module IRQ */ if (status == 0) { struct resource r = { .start = pdata->irq_base + 0, .flags = IORESOURCE_IRQ, }; status = platform_device_add_resources(pdev, &r, 1); } if (status == 0) status = platform_device_add(pdev); if (status < 0) { platform_device_put(pdev); dev_dbg(&twl->client->dev, "can't create gpio dev, %d\n", status); goto err; } } if (twl_has_keypad() && pdata->keypad) { pdev = platform_device_alloc("twl4030_keypad", -1); if (pdev) { twl = &twl4030_modules[2]; pdev->dev.parent = &twl->client->dev; device_init_wakeup(&pdev->dev, 1); status = platform_device_add_data(pdev, pdata->keypad, sizeof(*pdata->keypad)); if (status < 0) { dev_dbg(&twl->client->dev, "can't add keypad data, %d\n", status); platform_device_put(pdev); goto err; } status = platform_device_add(pdev); if (status < 0) { platform_device_put(pdev); dev_dbg(&twl->client->dev, "can't create keypad dev, %d\n", status); goto err; } } else { pr_debug("%s: can't alloc keypad dev\n", DRIVER_NAME); status = -ENOMEM; goto err; } } if (twl_has_madc() && pdata->madc) { pdev = platform_device_alloc("twl4030_madc", -1); if (pdev) { twl = &twl4030_modules[2]; pdev->dev.parent = &twl->client->dev; device_init_wakeup(&pdev->dev, 1); status = platform_device_add_data(pdev, pdata->madc, sizeof(*pdata->madc)); if (status < 0) { platform_device_put(pdev); dev_dbg(&twl->client->dev, "can't add madc data, %d\n", status); goto err; } status = platform_device_add(pdev); if (status < 0) { platform_device_put(pdev); dev_dbg(&twl->client->dev, "can't create madc dev, %d\n", status); goto err; } } else { pr_debug("%s: can't alloc madc dev\n", DRIVER_NAME); status = -ENOMEM; goto err; } } if (twl_has_rtc()) { twl = &twl4030_modules[3]; pdev = platform_device_alloc("twl4030_rtc", -1); if (!pdev) { pr_debug("%s: can't alloc rtc dev\n", DRIVER_NAME); status = -ENOMEM; } else { pdev->dev.parent = &twl->client->dev; device_init_wakeup(&pdev->dev, 1); } /* * REVISIT platform_data here currently might use of * "msecure" line ... but for now we just expect board * setup to tell the chip "we are secure" at all times. * Eventually, Linux might become more aware of such * HW security concerns, and "least privilege". */ /* RTC module IRQ */ if (status == 0) { struct resource r = { /* REVISIT don't hard-wire this stuff */ .start = TWL4030_PWRIRQ_RTC, .flags = IORESOURCE_IRQ, }; status = platform_device_add_resources(pdev, &r, 1); } if (status == 0) status = platform_device_add(pdev); if (status < 0) { platform_device_put(pdev); dev_dbg(&twl->client->dev, "can't create rtc dev, %d\n", status); goto err; } } if (twl_has_usb() && pdata->usb) { twl = &twl4030_modules[0]; pdev = platform_device_alloc("twl4030_usb", -1); if (!pdev) { pr_debug("%s: can't alloc usb dev\n", DRIVER_NAME); status = -ENOMEM; goto err; } if (status == 0) { pdev->dev.parent = &twl->client->dev; device_init_wakeup(&pdev->dev, 1); status = platform_device_add_data(pdev, pdata->usb, sizeof(*pdata->usb)); if (status < 0) { platform_device_put(pdev); dev_dbg(&twl->client->dev, "can't add usb data, %d\n", status); goto err; } } if (status == 0) { struct resource r = { .start = TWL4030_PWRIRQ_USB_PRES, .flags = IORESOURCE_IRQ, }; status = platform_device_add_resources(pdev, &r, 1); } if (status == 0) status = platform_device_add(pdev); if (status < 0) { platform_device_put(pdev); dev_dbg(&twl->client->dev, "can't create usb dev, %d\n", status); } } err: if (status) pr_err("failed to add twl4030's children (status %d)\n", status); return status; } /*----------------------------------------------------------------------*/ /* * These three functions initialize the on-chip clock framework, * letting it generate the right frequencies for USB, MADC, and * other purposes. */ static inline int __init protect_pm_master(void) { int e = 0; e = twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, KEY_LOCK, R_PROTECT_KEY); return e; } static inline int __init unprotect_pm_master(void) { int e = 0; e |= twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, KEY_UNLOCK1, R_PROTECT_KEY); e |= twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, KEY_UNLOCK2, R_PROTECT_KEY); return e; } static void __init clocks_init(void) { int e = 0; struct clk *osc; u32 rate; u8 ctrl = HFCLK_FREQ_26_MHZ; #if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3) if (cpu_is_omap2430()) osc = clk_get(NULL, "osc_ck"); else osc = clk_get(NULL, "osc_sys_ck"); #else /* REVISIT for non-OMAP systems, pass the clock rate from * board init code, using platform_data. */ osc = ERR_PTR(-EIO); #endif if (IS_ERR(osc)) { printk(KERN_WARNING "Skipping twl4030 internal clock init and " "using bootloader value (unknown osc rate)\n"); return; } rate = clk_get_rate(osc); clk_put(osc); switch (rate) { case 19200000: ctrl = HFCLK_FREQ_19p2_MHZ; break; case 26000000: ctrl = HFCLK_FREQ_26_MHZ; break; case 38400000: ctrl = HFCLK_FREQ_38p4_MHZ; break; } ctrl |= HIGH_PERF_SQ; e |= unprotect_pm_master(); /* effect->MADC+USB ck en */ e |= twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, ctrl, R_CFG_BOOT); e |= protect_pm_master(); if (e < 0) pr_err("%s: clock init err [%d]\n", DRIVER_NAME, e); } /*----------------------------------------------------------------------*/ /** * twl4030_i2c_clear_isr - clear TWL4030 SIH ISR regs via read + write * @mod_no: TWL4030 module number * @reg: register index to clear * @cor: value of the _SIH_CTRL.COR bit (1 or 0) * * Either reads (cor == 1) or writes (cor == 0) to a TWL4030 interrupt * status register to ensure that any prior interrupts are cleared. * Returns the status from the I2C read operation. */ static int __init twl4030_i2c_clear_isr(u8 mod_no, u8 reg, u8 cor) { u8 tmp; return (cor) ? twl4030_i2c_read_u8(mod_no, &tmp, reg) : twl4030_i2c_write_u8(mod_no, 0xff, reg); } /** * twl4030_read_cor_bit - are TWL module ISRs cleared by reads or writes? * @mod_no: TWL4030 module number * @reg: register index to clear * * Returns 1 if the TWL4030 SIH interrupt status registers (ISRs) for * the specified TWL module are cleared by reads, or 0 if cleared by * writes. */ static int twl4030_read_cor_bit(u8 mod_no, u8 reg) { u8 tmp = 0; WARN_ON(twl4030_i2c_read_u8(mod_no, &tmp, reg) < 0); tmp &= TWL4030_SIH_CTRL_COR_MASK; tmp >>= __ffs(TWL4030_SIH_CTRL_COR_MASK); return tmp; } /** * twl4030_mask_clear_intrs - mask and clear all TWL4030 interrupts * @t: pointer to twl4030_mod_iregs array * @t_sz: ARRAY_SIZE(t) (starting at 1) * * Mask all TWL4030 interrupt mask registers (IMRs) and clear all * interrupt status registers (ISRs). No return value, but will WARN if * any I2C operations fail. */ static void __init twl4030_mask_clear_intrs(const struct twl4030_mod_iregs *t, const u8 t_sz) { int i, j; /* * N.B. - further efficiency is possible here. Eight I2C * operations on BCI and GPIO modules are avoidable if I2C * burst read/write transactions were implemented. Would * probably save about 1ms of boot time and a small amount of * power. */ for (i = 0; i < t_sz; i++) { const struct twl4030_mod_iregs tmr = t[i]; int cor; /* Are ISRs cleared by reads or writes? */ cor = twl4030_read_cor_bit(tmr.mod_no, tmr.sih_ctrl); for (j = 0; j < tmr.reg_cnt; j++) { /* Mask interrupts at the TWL4030 */ WARN_ON(twl4030_i2c_write_u8(tmr.mod_no, 0xff, tmr.imrs[j]) < 0); /* Clear TWL4030 ISRs */ WARN_ON(twl4030_i2c_clear_isr(tmr.mod_no, tmr.isrs[j], cor) < 0); } } } static void twl_init_irq(int irq_num, unsigned irq_base, unsigned irq_end) { int i; /* * Mask and clear all TWL4030 interrupts since initially we do * not have any TWL4030 module interrupt handlers present */ twl4030_mask_clear_intrs(twl4030_mod_regs, ARRAY_SIZE(twl4030_mod_regs)); twl4030_irq_base = irq_base; /* install an irq handler for each of the PIH modules */ for (i = irq_base; i < irq_end; i++) { set_irq_chip_and_handler(i, &twl4030_irq_chip, handle_simple_irq); activate_irq(i); } /* install an irq handler to demultiplex the TWL4030 interrupt */ set_irq_data(irq_num, start_twl4030_irq_thread(irq_num)); set_irq_chained_handler(irq_num, do_twl4030_irq); } /*----------------------------------------------------------------------*/ static int twl4030_remove(struct i2c_client *client) { unsigned i; /* FIXME undo twl_init_irq() */ if (twl4030_irq_base) { dev_err(&client->dev, "can't yet clean up IRQs?\n"); return -ENOSYS; } for (i = 0; i < TWL4030_NUM_SLAVES; i++) { struct twl4030_client *twl = &twl4030_modules[i]; if (twl->client && twl->client != client) i2c_unregister_device(twl->client); twl4030_modules[i].client = NULL; } inuse = false; return 0; } /* NOTE: this driver only handles a single twl4030/tps659x0 chip */ static int twl4030_probe(struct i2c_client *client, const struct i2c_device_id *id) { int status; unsigned i; struct twl4030_platform_data *pdata = client->dev.platform_data; if (!pdata) { dev_dbg(&client->dev, "no platform data?\n"); return -EINVAL; } if (i2c_check_functionality(client->adapter, I2C_FUNC_I2C) == 0) { dev_dbg(&client->dev, "can't talk I2C?\n"); return -EIO; } if (inuse || twl4030_irq_base) { dev_dbg(&client->dev, "driver is already in use\n"); return -EBUSY; } for (i = 0; i < TWL4030_NUM_SLAVES; i++) { struct twl4030_client *twl = &twl4030_modules[i]; twl->address = client->addr + i; if (i == 0) twl->client = client; else { twl->client = i2c_new_dummy(client->adapter, twl->address); if (!twl->client) { dev_err(&twl->client->dev, "can't attach client %d\n", i); status = -ENOMEM; goto fail; } strlcpy(twl->client->name, id->name, sizeof(twl->client->name)); } mutex_init(&twl->xfer_lock); } inuse = true; /* setup clock framework */ clocks_init(); /* Maybe init the T2 Interrupt subsystem */ if (client->irq && pdata->irq_base && pdata->irq_end > pdata->irq_base) { twl_init_irq(client->irq, pdata->irq_base, pdata->irq_end); dev_info(&client->dev, "IRQ %d chains IRQs %d..%d\n", client->irq, pdata->irq_base, pdata->irq_end - 1); } status = add_children(pdata); fail: if (status < 0) twl4030_remove(client); return status; } static const struct i2c_device_id twl4030_ids[] = { { "twl4030", 0 }, /* "Triton 2" */ { "tps65950", 0 }, /* catalog version of twl4030 */ { "tps65930", 0 }, /* fewer LDOs and DACs; no charger */ { "tps65920", 0 }, /* fewer LDOs; no codec or charger */ { "twl5030", 0 }, /* T2 updated */ { /* end of list */ }, }; MODULE_DEVICE_TABLE(i2c, twl4030_ids); /* One Client Driver , 4 Clients */ static struct i2c_driver twl4030_driver = { .driver.name = DRIVER_NAME, .id_table = twl4030_ids, .probe = twl4030_probe, .remove = twl4030_remove, }; static int __init twl4030_init(void) { return i2c_add_driver(&twl4030_driver); } subsys_initcall(twl4030_init); static void __exit twl4030_exit(void) { i2c_del_driver(&twl4030_driver); } module_exit(twl4030_exit); MODULE_AUTHOR("Texas Instruments, Inc."); MODULE_DESCRIPTION("I2C Core interface for TWL4030"); MODULE_LICENSE("GPL");