diff options
Diffstat (limited to 'drivers/mfd/db5500-prcmu.c')
| -rw-r--r-- | drivers/mfd/db5500-prcmu.c | 448 |
1 files changed, 448 insertions, 0 deletions
diff --git a/drivers/mfd/db5500-prcmu.c b/drivers/mfd/db5500-prcmu.c new file mode 100644 index 000000000000..9dbb3cab4a6f --- /dev/null +++ b/drivers/mfd/db5500-prcmu.c @@ -0,0 +1,448 @@ +/* + * Copyright (C) ST-Ericsson SA 2010 + * + * License Terms: GNU General Public License v2 + * Author: Mattias Nilsson <mattias.i.nilsson@stericsson.com> + * + * U5500 PRCM Unit interface driver + */ +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/delay.h> +#include <linux/errno.h> +#include <linux/err.h> +#include <linux/spinlock.h> +#include <linux/io.h> +#include <linux/slab.h> +#include <linux/mutex.h> +#include <linux/completion.h> +#include <linux/irq.h> +#include <linux/jiffies.h> +#include <linux/bitops.h> +#include <linux/interrupt.h> +#include <linux/mfd/db5500-prcmu.h> +#include <mach/hardware.h> +#include <mach/irqs.h> +#include <mach/db5500-regs.h> +#include "db5500-prcmu-regs.h" + +#define _PRCM_MB_HEADER (tcdm_base + 0xFE8) +#define PRCM_REQ_MB0_HEADER (_PRCM_MB_HEADER + 0x0) +#define PRCM_REQ_MB1_HEADER (_PRCM_MB_HEADER + 0x1) +#define PRCM_REQ_MB2_HEADER (_PRCM_MB_HEADER + 0x2) +#define PRCM_REQ_MB3_HEADER (_PRCM_MB_HEADER + 0x3) +#define PRCM_REQ_MB4_HEADER (_PRCM_MB_HEADER + 0x4) +#define PRCM_REQ_MB5_HEADER (_PRCM_MB_HEADER + 0x5) +#define PRCM_REQ_MB6_HEADER (_PRCM_MB_HEADER + 0x6) +#define PRCM_REQ_MB7_HEADER (_PRCM_MB_HEADER + 0x7) +#define PRCM_ACK_MB0_HEADER (_PRCM_MB_HEADER + 0x8) +#define PRCM_ACK_MB1_HEADER (_PRCM_MB_HEADER + 0x9) +#define PRCM_ACK_MB2_HEADER (_PRCM_MB_HEADER + 0xa) +#define PRCM_ACK_MB3_HEADER (_PRCM_MB_HEADER + 0xb) +#define PRCM_ACK_MB4_HEADER (_PRCM_MB_HEADER + 0xc) +#define PRCM_ACK_MB5_HEADER (_PRCM_MB_HEADER + 0xd) +#define PRCM_ACK_MB6_HEADER (_PRCM_MB_HEADER + 0xe) +#define PRCM_ACK_MB7_HEADER (_PRCM_MB_HEADER + 0xf) + +/* Req Mailboxes */ +#define PRCM_REQ_MB0 (tcdm_base + 0xFD8) +#define PRCM_REQ_MB1 (tcdm_base + 0xFCC) +#define PRCM_REQ_MB2 (tcdm_base + 0xFC4) +#define PRCM_REQ_MB3 (tcdm_base + 0xFC0) +#define PRCM_REQ_MB4 (tcdm_base + 0xF98) +#define PRCM_REQ_MB5 (tcdm_base + 0xF90) +#define PRCM_REQ_MB6 (tcdm_base + 0xF8C) +#define PRCM_REQ_MB7 (tcdm_base + 0xF84) + +/* Ack Mailboxes */ +#define PRCM_ACK_MB0 (tcdm_base + 0xF38) +#define PRCM_ACK_MB1 (tcdm_base + 0xF30) +#define PRCM_ACK_MB2 (tcdm_base + 0xF24) +#define PRCM_ACK_MB3 (tcdm_base + 0xF20) +#define PRCM_ACK_MB4 (tcdm_base + 0xF1C) +#define PRCM_ACK_MB5 (tcdm_base + 0xF14) +#define PRCM_ACK_MB6 (tcdm_base + 0xF0C) +#define PRCM_ACK_MB7 (tcdm_base + 0xF08) + +enum mb_return_code { + RC_SUCCESS, + RC_FAIL, +}; + +/* Mailbox 0 headers. */ +enum mb0_header { + /* request */ + RMB0H_PWR_STATE_TRANS = 1, + RMB0H_WAKE_UP_CFG, + RMB0H_RD_WAKE_UP_ACK, + /* acknowledge */ + AMB0H_WAKE_UP = 1, +}; + +/* Mailbox 5 headers. */ +enum mb5_header { + MB5H_I2C_WRITE = 1, + MB5H_I2C_READ, +}; + +/* Request mailbox 5 fields. */ +#define PRCM_REQ_MB5_I2C_SLAVE (PRCM_REQ_MB5 + 0) +#define PRCM_REQ_MB5_I2C_REG (PRCM_REQ_MB5 + 1) +#define PRCM_REQ_MB5_I2C_SIZE (PRCM_REQ_MB5 + 2) +#define PRCM_REQ_MB5_I2C_DATA (PRCM_REQ_MB5 + 4) + +/* Acknowledge mailbox 5 fields. */ +#define PRCM_ACK_MB5_RETURN_CODE (PRCM_ACK_MB5 + 0) +#define PRCM_ACK_MB5_I2C_DATA (PRCM_ACK_MB5 + 4) + +#define NUM_MB 8 +#define MBOX_BIT BIT +#define ALL_MBOX_BITS (MBOX_BIT(NUM_MB) - 1) + +/* +* Used by MCDE to setup all necessary PRCMU registers +*/ +#define PRCMU_RESET_DSIPLL 0x00004000 +#define PRCMU_UNCLAMP_DSIPLL 0x00400800 + +/* HDMI CLK MGT PLLSW=001 (PLLSOC0), PLLDIV=0x8, = 50 Mhz*/ +#define PRCMU_DSI_CLOCK_SETTING 0x00000128 +/* TVCLK_MGT PLLSW=001 (PLLSOC0) PLLDIV=0x13, = 19.05 MHZ */ +#define PRCMU_DSI_LP_CLOCK_SETTING 0x00000135 +#define PRCMU_PLLDSI_FREQ_SETTING 0x0004013C +#define PRCMU_DSI_PLLOUT_SEL_SETTING 0x00000002 +#define PRCMU_ENABLE_ESCAPE_CLOCK_DIV 0x03000101 +#define PRCMU_DISABLE_ESCAPE_CLOCK_DIV 0x00000101 + +#define PRCMU_ENABLE_PLLDSI 0x00000001 +#define PRCMU_DISABLE_PLLDSI 0x00000000 + +#define PRCMU_DSI_RESET_SW 0x00000003 + +#define PRCMU_PLLDSI_LOCKP_LOCKED 0x3 + +/* + * mb0_transfer - state needed for mailbox 0 communication. + * @lock: The transaction lock. + */ +static struct { + spinlock_t lock; +} mb0_transfer; + +/* + * mb5_transfer - state needed for mailbox 5 communication. + * @lock: The transaction lock. + * @work: The transaction completion structure. + * @ack: Reply ("acknowledge") data. + */ +static struct { + struct mutex lock; + struct completion work; + struct { + u8 header; + u8 status; + u8 value[4]; + } ack; +} mb5_transfer; + +/* PRCMU TCDM base IO address. */ +static __iomem void *tcdm_base; + +/** + * db5500_prcmu_abb_read() - Read register value(s) from the ABB. + * @slave: The I2C slave address. + * @reg: The (start) register address. + * @value: The read out value(s). + * @size: The number of registers to read. + * + * Reads register value(s) from the ABB. + * @size has to be <= 4. + */ +int db5500_prcmu_abb_read(u8 slave, u8 reg, u8 *value, u8 size) +{ + int r; + + if ((size < 1) || (4 < size)) + return -EINVAL; + + mutex_lock(&mb5_transfer.lock); + + while (readl(PRCM_MBOX_CPU_VAL) & MBOX_BIT(5)) + cpu_relax(); + writeb(slave, PRCM_REQ_MB5_I2C_SLAVE); + writeb(reg, PRCM_REQ_MB5_I2C_REG); + writeb(size, PRCM_REQ_MB5_I2C_SIZE); + writeb(MB5H_I2C_READ, PRCM_REQ_MB5_HEADER); + + writel(MBOX_BIT(5), PRCM_MBOX_CPU_SET); + wait_for_completion(&mb5_transfer.work); + + r = 0; + if ((mb5_transfer.ack.header == MB5H_I2C_READ) && + (mb5_transfer.ack.status == RC_SUCCESS)) + memcpy(value, mb5_transfer.ack.value, (size_t)size); + else + r = -EIO; + + mutex_unlock(&mb5_transfer.lock); + + return r; +} + +/** + * db5500_prcmu_abb_write() - Write register value(s) to the ABB. + * @slave: The I2C slave address. + * @reg: The (start) register address. + * @value: The value(s) to write. + * @size: The number of registers to write. + * + * Writes register value(s) to the ABB. + * @size has to be <= 4. + */ +int db5500_prcmu_abb_write(u8 slave, u8 reg, u8 *value, u8 size) +{ + int r; + + if ((size < 1) || (4 < size)) + return -EINVAL; + + mutex_lock(&mb5_transfer.lock); + + while (readl(PRCM_MBOX_CPU_VAL) & MBOX_BIT(5)) + cpu_relax(); + writeb(slave, PRCM_REQ_MB5_I2C_SLAVE); + writeb(reg, PRCM_REQ_MB5_I2C_REG); + writeb(size, PRCM_REQ_MB5_I2C_SIZE); + memcpy_toio(PRCM_REQ_MB5_I2C_DATA, value, size); + writeb(MB5H_I2C_WRITE, PRCM_REQ_MB5_HEADER); + + writel(MBOX_BIT(5), PRCM_MBOX_CPU_SET); + wait_for_completion(&mb5_transfer.work); + + if ((mb5_transfer.ack.header == MB5H_I2C_WRITE) && + (mb5_transfer.ack.status == RC_SUCCESS)) + r = 0; + else + r = -EIO; + + mutex_unlock(&mb5_transfer.lock); + + return r; +} + +int db5500_prcmu_enable_dsipll(void) +{ + int i; + + /* Enable DSIPLL_RESETN resets */ + writel(PRCMU_RESET_DSIPLL, PRCM_APE_RESETN_CLR); + /* Unclamp DSIPLL in/out */ + writel(PRCMU_UNCLAMP_DSIPLL, PRCM_MMIP_LS_CLAMP_CLR); + /* Set DSI PLL FREQ */ + writel(PRCMU_PLLDSI_FREQ_SETTING, PRCM_PLLDSI_FREQ); + writel(PRCMU_DSI_PLLOUT_SEL_SETTING, + PRCM_DSI_PLLOUT_SEL); + /* Enable Escape clocks */ + writel(PRCMU_ENABLE_ESCAPE_CLOCK_DIV, PRCM_DSITVCLK_DIV); + + /* Start DSI PLL */ + writel(PRCMU_ENABLE_PLLDSI, PRCM_PLLDSI_ENABLE); + /* Reset DSI PLL */ + writel(PRCMU_DSI_RESET_SW, PRCM_DSI_SW_RESET); + for (i = 0; i < 10; i++) { + if ((readl(PRCM_PLLDSI_LOCKP) & + PRCMU_PLLDSI_LOCKP_LOCKED) == PRCMU_PLLDSI_LOCKP_LOCKED) + break; + udelay(100); + } + /* Release DSIPLL_RESETN */ + writel(PRCMU_RESET_DSIPLL, PRCM_APE_RESETN_SET); + return 0; +} + +int db5500_prcmu_disable_dsipll(void) +{ + /* Disable dsi pll */ + writel(PRCMU_DISABLE_PLLDSI, PRCM_PLLDSI_ENABLE); + /* Disable escapeclock */ + writel(PRCMU_DISABLE_ESCAPE_CLOCK_DIV, PRCM_DSITVCLK_DIV); + return 0; +} + +int db5500_prcmu_set_display_clocks(void) +{ + /* HDMI and TVCLK Should be handled somewhere else */ + /* PLLDIV=8, PLLSW=2, CLKEN=1 */ + writel(PRCMU_DSI_CLOCK_SETTING, PRCM_HDMICLK_MGT); + /* PLLDIV=14, PLLSW=2, CLKEN=1 */ + writel(PRCMU_DSI_LP_CLOCK_SETTING, PRCM_TVCLK_MGT); + return 0; +} + +static void ack_dbb_wakeup(void) +{ + unsigned long flags; + + spin_lock_irqsave(&mb0_transfer.lock, flags); + + while (readl(PRCM_MBOX_CPU_VAL) & MBOX_BIT(0)) + cpu_relax(); + + writeb(RMB0H_RD_WAKE_UP_ACK, PRCM_REQ_MB0_HEADER); + writel(MBOX_BIT(0), PRCM_MBOX_CPU_SET); + + spin_unlock_irqrestore(&mb0_transfer.lock, flags); +} + +static inline void print_unknown_header_warning(u8 n, u8 header) +{ + pr_warning("prcmu: Unknown message header (%d) in mailbox %d.\n", + header, n); +} + +static bool read_mailbox_0(void) +{ + bool r; + u8 header; + + header = readb(PRCM_ACK_MB0_HEADER); + switch (header) { + case AMB0H_WAKE_UP: + r = true; + break; + default: + print_unknown_header_warning(0, header); + r = false; + break; + } + writel(MBOX_BIT(0), PRCM_ARM_IT1_CLEAR); + return r; +} + +static bool read_mailbox_1(void) +{ + writel(MBOX_BIT(1), PRCM_ARM_IT1_CLEAR); + return false; +} + +static bool read_mailbox_2(void) +{ + writel(MBOX_BIT(2), PRCM_ARM_IT1_CLEAR); + return false; +} + +static bool read_mailbox_3(void) +{ + writel(MBOX_BIT(3), PRCM_ARM_IT1_CLEAR); + return false; +} + +static bool read_mailbox_4(void) +{ + writel(MBOX_BIT(4), PRCM_ARM_IT1_CLEAR); + return false; +} + +static bool read_mailbox_5(void) +{ + u8 header; + + header = readb(PRCM_ACK_MB5_HEADER); + switch (header) { + case MB5H_I2C_READ: + memcpy_fromio(mb5_transfer.ack.value, PRCM_ACK_MB5_I2C_DATA, 4); + case MB5H_I2C_WRITE: + mb5_transfer.ack.header = header; + mb5_transfer.ack.status = readb(PRCM_ACK_MB5_RETURN_CODE); + complete(&mb5_transfer.work); + break; + default: + print_unknown_header_warning(5, header); + break; + } + writel(MBOX_BIT(5), PRCM_ARM_IT1_CLEAR); + return false; +} + +static bool read_mailbox_6(void) +{ + writel(MBOX_BIT(6), PRCM_ARM_IT1_CLEAR); + return false; +} + +static bool read_mailbox_7(void) +{ + writel(MBOX_BIT(7), PRCM_ARM_IT1_CLEAR); + return false; +} + +static bool (* const read_mailbox[NUM_MB])(void) = { + read_mailbox_0, + read_mailbox_1, + read_mailbox_2, + read_mailbox_3, + read_mailbox_4, + read_mailbox_5, + read_mailbox_6, + read_mailbox_7 +}; + +static irqreturn_t prcmu_irq_handler(int irq, void *data) +{ + u32 bits; + u8 n; + irqreturn_t r; + + bits = (readl(PRCM_ARM_IT1_VAL) & ALL_MBOX_BITS); + if (unlikely(!bits)) + return IRQ_NONE; + + r = IRQ_HANDLED; + for (n = 0; bits; n++) { + if (bits & MBOX_BIT(n)) { + bits -= MBOX_BIT(n); + if (read_mailbox[n]()) + r = IRQ_WAKE_THREAD; + } + } + return r; +} + +static irqreturn_t prcmu_irq_thread_fn(int irq, void *data) +{ + ack_dbb_wakeup(); + return IRQ_HANDLED; +} + +void __init db5500_prcmu_early_init(void) +{ + tcdm_base = __io_address(U5500_PRCMU_TCDM_BASE); + spin_lock_init(&mb0_transfer.lock); + mutex_init(&mb5_transfer.lock); + init_completion(&mb5_transfer.work); +} + +/** + * prcmu_fw_init - arch init call for the Linux PRCMU fw init logic + * + */ +int __init db5500_prcmu_init(void) +{ + int r = 0; + + if (ux500_is_svp() || !cpu_is_u5500()) + return -ENODEV; + + /* Clean up the mailbox interrupts after pre-kernel code. */ + writel(ALL_MBOX_BITS, PRCM_ARM_IT1_CLEAR); + + r = request_threaded_irq(IRQ_DB5500_PRCMU1, prcmu_irq_handler, + prcmu_irq_thread_fn, 0, "prcmu", NULL); + if (r < 0) { + pr_err("prcmu: Failed to allocate IRQ_DB5500_PRCMU1.\n"); + return -EBUSY; + } + return 0; +} + +arch_initcall(db5500_prcmu_init); |