diff options
Diffstat (limited to 'drivers/platform/x86/intel_scu_ipc.c')
| -rw-r--r-- | drivers/platform/x86/intel_scu_ipc.c | 829 |
1 files changed, 829 insertions, 0 deletions
diff --git a/drivers/platform/x86/intel_scu_ipc.c b/drivers/platform/x86/intel_scu_ipc.c new file mode 100644 index 00000000000..40658e3385b --- /dev/null +++ b/drivers/platform/x86/intel_scu_ipc.c @@ -0,0 +1,829 @@ +/* + * intel_scu_ipc.c: Driver for the Intel SCU IPC mechanism + * + * (C) Copyright 2008-2010 Intel Corporation + * Author: Sreedhara DS (sreedhara.ds@intel.com) + * + * 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; version 2 + * of the License. + * + * SCU runing in ARC processor communicates with other entity running in IA + * core through IPC mechanism which in turn messaging between IA core ad SCU. + * SCU has two IPC mechanism IPC-1 and IPC-2. IPC-1 is used between IA32 and + * SCU where IPC-2 is used between P-Unit and SCU. This driver delas with + * IPC-1 Driver provides an API for power control unit registers (e.g. MSIC) + * along with other APIs. + */ +#include <linux/delay.h> +#include <linux/errno.h> +#include <linux/init.h> +#include <linux/sysdev.h> +#include <linux/pm.h> +#include <linux/pci.h> +#include <linux/interrupt.h> +#include <asm/setup.h> +#include <asm/intel_scu_ipc.h> + +/* IPC defines the following message types */ +#define IPCMSG_WATCHDOG_TIMER 0xF8 /* Set Kernel Watchdog Threshold */ +#define IPCMSG_BATTERY 0xEF /* Coulomb Counter Accumulator */ +#define IPCMSG_FW_UPDATE 0xFE /* Firmware update */ +#define IPCMSG_PCNTRL 0xFF /* Power controller unit read/write */ +#define IPCMSG_FW_REVISION 0xF4 /* Get firmware revision */ + +/* Command id associated with message IPCMSG_PCNTRL */ +#define IPC_CMD_PCNTRL_W 0 /* Register write */ +#define IPC_CMD_PCNTRL_R 1 /* Register read */ +#define IPC_CMD_PCNTRL_M 2 /* Register read-modify-write */ + +/* Miscelaneous Command ids */ +#define IPC_CMD_INDIRECT_RD 2 /* 32bit indirect read */ +#define IPC_CMD_INDIRECT_WR 5 /* 32bit indirect write */ + +/* + * IPC register summary + * + * IPC register blocks are memory mapped at fixed address of 0xFF11C000 + * To read or write information to the SCU, driver writes to IPC-1 memory + * mapped registers (base address 0xFF11C000). The following is the IPC + * mechanism + * + * 1. IA core cDMI interface claims this transaction and converts it to a + * Transaction Layer Packet (TLP) message which is sent across the cDMI. + * + * 2. South Complex cDMI block receives this message and writes it to + * the IPC-1 register block, causing an interrupt to the SCU + * + * 3. SCU firmware decodes this interrupt and IPC message and the appropriate + * message handler is called within firmware. + */ + +#define IPC_BASE_ADDR 0xFF11C000 /* IPC1 base register address */ +#define IPC_MAX_ADDR 0x100 /* Maximum IPC regisers */ +#define IPC_WWBUF_SIZE 16 /* IPC Write buffer Size */ +#define IPC_RWBUF_SIZE 16 /* IPC Read buffer Size */ +#define IPC_I2C_BASE 0xFF12B000 /* I2C control register base address */ +#define IPC_I2C_MAX_ADDR 0x10 /* Maximum I2C regisers */ + +static int ipc_probe(struct pci_dev *dev, const struct pci_device_id *id); +static void ipc_remove(struct pci_dev *pdev); + +struct intel_scu_ipc_dev { + struct pci_dev *pdev; + void __iomem *ipc_base; + void __iomem *i2c_base; +}; + +static struct intel_scu_ipc_dev ipcdev; /* Only one for now */ + +static int platform = 1; +module_param(platform, int, 0); +MODULE_PARM_DESC(platform, "1 for moorestown platform"); + + + + +/* + * IPC Read Buffer (Read Only): + * 16 byte buffer for receiving data from SCU, if IPC command + * processing results in response data + */ +#define IPC_READ_BUFFER 0x90 + +#define IPC_I2C_CNTRL_ADDR 0 +#define I2C_DATA_ADDR 0x04 + +static DEFINE_MUTEX(ipclock); /* lock used to prevent multiple call to SCU */ + +/* + * Command Register (Write Only): + * A write to this register results in an interrupt to the SCU core processor + * Format: + * |rfu2(8) | size(8) | command id(4) | rfu1(3) | ioc(1) | command(8)| + */ +static inline void ipc_command(u32 cmd) /* Send ipc command */ +{ + writel(cmd, ipcdev.ipc_base); +} + +/* + * IPC Write Buffer (Write Only): + * 16-byte buffer for sending data associated with IPC command to + * SCU. Size of the data is specified in the IPC_COMMAND_REG register + */ +static inline void ipc_data_writel(u32 data, u32 offset) /* Write ipc data */ +{ + writel(data, ipcdev.ipc_base + 0x80 + offset); +} + +/* + * IPC destination Pointer (Write Only): + * Use content as pointer for destination write + */ +static inline void ipc_write_dptr(u32 data) /* Write dptr data */ +{ + writel(data, ipcdev.ipc_base + 0x0C); +} + +/* + * IPC Source Pointer (Write Only): + * Use content as pointer for read location +*/ +static inline void ipc_write_sptr(u32 data) /* Write dptr data */ +{ + writel(data, ipcdev.ipc_base + 0x08); +} + +/* + * Status Register (Read Only): + * Driver will read this register to get the ready/busy status of the IPC + * block and error status of the IPC command that was just processed by SCU + * Format: + * |rfu3(8)|error code(8)|initiator id(8)|cmd id(4)|rfu1(2)|error(1)|busy(1)| + */ + +static inline u8 ipc_read_status(void) +{ + return __raw_readl(ipcdev.ipc_base + 0x04); +} + +static inline u8 ipc_data_readb(u32 offset) /* Read ipc byte data */ +{ + return readb(ipcdev.ipc_base + IPC_READ_BUFFER + offset); +} + +static inline u8 ipc_data_readl(u32 offset) /* Read ipc u32 data */ +{ + return readl(ipcdev.ipc_base + IPC_READ_BUFFER + offset); +} + +static inline int busy_loop(void) /* Wait till scu status is busy */ +{ + u32 status = 0; + u32 loop_count = 0; + + status = ipc_read_status(); + while (status & 1) { + udelay(1); /* scu processing time is in few u secods */ + status = ipc_read_status(); + loop_count++; + /* break if scu doesn't reset busy bit after huge retry */ + if (loop_count > 100000) { + dev_err(&ipcdev.pdev->dev, "IPC timed out"); + return -ETIMEDOUT; + } + } + return (status >> 1) & 1; +} + +/* Read/Write power control(PMIC in Langwell, MSIC in PenWell) registers */ +static int pwr_reg_rdwr(u16 *addr, u8 *data, u32 count, u32 op, u32 id) +{ + int nc; + u32 offset = 0; + u32 err = 0; + u8 cbuf[IPC_WWBUF_SIZE] = { '\0' }; + u32 *wbuf = (u32 *)&cbuf; + + mutex_lock(&ipclock); + if (ipcdev.pdev == NULL) { + mutex_unlock(&ipclock); + return -ENODEV; + } + + if (platform == 1) { + /* Entry is 4 bytes for read/write, 5 bytes for read modify */ + for (nc = 0; nc < count; nc++) { + cbuf[offset] = addr[nc]; + cbuf[offset + 1] = addr[nc] >> 8; + if (id != IPC_CMD_PCNTRL_R) + cbuf[offset + 2] = data[nc]; + if (id == IPC_CMD_PCNTRL_M) { + cbuf[offset + 3] = data[nc + 1]; + offset += 1; + } + offset += 3; + } + for (nc = 0, offset = 0; nc < count; nc++, offset += 4) + ipc_data_writel(wbuf[nc], offset); /* Write wbuff */ + + } else { + for (nc = 0, offset = 0; nc < count; nc++, offset += 2) + ipc_data_writel(addr[nc], offset); /* Write addresses */ + if (id != IPC_CMD_PCNTRL_R) { + for (nc = 0; nc < count; nc++, offset++) + ipc_data_writel(data[nc], offset); /* Write data */ + if (id == IPC_CMD_PCNTRL_M) + ipc_data_writel(data[nc + 1], offset); /* Mask value*/ + } + } + + if (id != IPC_CMD_PCNTRL_M) + ipc_command((count * 3) << 16 | id << 12 | 0 << 8 | op); + else + ipc_command((count * 4) << 16 | id << 12 | 0 << 8 | op); + + err = busy_loop(); + + if (id == IPC_CMD_PCNTRL_R) { /* Read rbuf */ + /* Workaround: values are read as 0 without memcpy_fromio */ + memcpy_fromio(cbuf, ipcdev.ipc_base + IPC_READ_BUFFER, 16); + if (platform == 1) { + for (nc = 0, offset = 2; nc < count; nc++, offset += 3) + data[nc] = ipc_data_readb(offset); + } else { + for (nc = 0; nc < count; nc++) + data[nc] = ipc_data_readb(nc); + } + } + mutex_unlock(&ipclock); + return err; +} + +/** + * intel_scu_ipc_ioread8 - read a word via the SCU + * @addr: register on SCU + * @data: return pointer for read byte + * + * Read a single register. Returns 0 on success or an error code. All + * locking between SCU accesses is handled for the caller. + * + * This function may sleep. + */ +int intel_scu_ipc_ioread8(u16 addr, u8 *data) +{ + return pwr_reg_rdwr(&addr, data, 1, IPCMSG_PCNTRL, IPC_CMD_PCNTRL_R); +} +EXPORT_SYMBOL(intel_scu_ipc_ioread8); + +/** + * intel_scu_ipc_ioread16 - read a word via the SCU + * @addr: register on SCU + * @data: return pointer for read word + * + * Read a register pair. Returns 0 on success or an error code. All + * locking between SCU accesses is handled for the caller. + * + * This function may sleep. + */ +int intel_scu_ipc_ioread16(u16 addr, u16 *data) +{ + u16 x[2] = {addr, addr + 1 }; + return pwr_reg_rdwr(x, (u8 *)data, 2, IPCMSG_PCNTRL, IPC_CMD_PCNTRL_R); +} +EXPORT_SYMBOL(intel_scu_ipc_ioread16); + +/** + * intel_scu_ipc_ioread32 - read a dword via the SCU + * @addr: register on SCU + * @data: return pointer for read dword + * + * Read four registers. Returns 0 on success or an error code. All + * locking between SCU accesses is handled for the caller. + * + * This function may sleep. + */ +int intel_scu_ipc_ioread32(u16 addr, u32 *data) +{ + u16 x[4] = {addr, addr + 1, addr + 2, addr + 3}; + return pwr_reg_rdwr(x, (u8 *)data, 4, IPCMSG_PCNTRL, IPC_CMD_PCNTRL_R); +} +EXPORT_SYMBOL(intel_scu_ipc_ioread32); + +/** + * intel_scu_ipc_iowrite8 - write a byte via the SCU + * @addr: register on SCU + * @data: byte to write + * + * Write a single register. Returns 0 on success or an error code. All + * locking between SCU accesses is handled for the caller. + * + * This function may sleep. + */ +int intel_scu_ipc_iowrite8(u16 addr, u8 data) +{ + return pwr_reg_rdwr(&addr, &data, 1, IPCMSG_PCNTRL, IPC_CMD_PCNTRL_W); +} +EXPORT_SYMBOL(intel_scu_ipc_iowrite8); + +/** + * intel_scu_ipc_iowrite16 - write a word via the SCU + * @addr: register on SCU + * @data: word to write + * + * Write two registers. Returns 0 on success or an error code. All + * locking between SCU accesses is handled for the caller. + * + * This function may sleep. + */ +int intel_scu_ipc_iowrite16(u16 addr, u16 data) +{ + u16 x[2] = {addr, addr + 1 }; + return pwr_reg_rdwr(x, (u8 *)&data, 2, IPCMSG_PCNTRL, IPC_CMD_PCNTRL_W); +} +EXPORT_SYMBOL(intel_scu_ipc_iowrite16); + +/** + * intel_scu_ipc_iowrite32 - write a dword via the SCU + * @addr: register on SCU + * @data: dword to write + * + * Write four registers. Returns 0 on success or an error code. All + * locking between SCU accesses is handled for the caller. + * + * This function may sleep. + */ +int intel_scu_ipc_iowrite32(u16 addr, u32 data) +{ + u16 x[4] = {addr, addr + 1, addr + 2, addr + 3}; + return pwr_reg_rdwr(x, (u8 *)&data, 4, IPCMSG_PCNTRL, IPC_CMD_PCNTRL_W); +} +EXPORT_SYMBOL(intel_scu_ipc_iowrite32); + +/** + * intel_scu_ipc_readvv - read a set of registers + * @addr: register list + * @data: bytes to return + * @len: length of array + * + * Read registers. Returns 0 on success or an error code. All + * locking between SCU accesses is handled for the caller. + * + * The largest array length permitted by the hardware is 5 items. + * + * This function may sleep. + */ +int intel_scu_ipc_readv(u16 *addr, u8 *data, int len) +{ + return pwr_reg_rdwr(addr, data, len, IPCMSG_PCNTRL, IPC_CMD_PCNTRL_R); +} +EXPORT_SYMBOL(intel_scu_ipc_readv); + +/** + * intel_scu_ipc_writev - write a set of registers + * @addr: register list + * @data: bytes to write + * @len: length of array + * + * Write registers. Returns 0 on success or an error code. All + * locking between SCU accesses is handled for the caller. + * + * The largest array length permitted by the hardware is 5 items. + * + * This function may sleep. + * + */ +int intel_scu_ipc_writev(u16 *addr, u8 *data, int len) +{ + return pwr_reg_rdwr(addr, data, len, IPCMSG_PCNTRL, IPC_CMD_PCNTRL_W); +} +EXPORT_SYMBOL(intel_scu_ipc_writev); + + +/** + * intel_scu_ipc_update_register - r/m/w a register + * @addr: register address + * @bits: bits to update + * @mask: mask of bits to update + * + * Read-modify-write power control unit register. The first data argument + * must be register value and second is mask value + * mask is a bitmap that indicates which bits to update. + * 0 = masked. Don't modify this bit, 1 = modify this bit. + * returns 0 on success or an error code. + * + * This function may sleep. Locking between SCU accesses is handled + * for the caller. + */ +int intel_scu_ipc_update_register(u16 addr, u8 bits, u8 mask) +{ + u8 data[2] = { bits, mask }; + return pwr_reg_rdwr(&addr, data, 1, IPCMSG_PCNTRL, IPC_CMD_PCNTRL_M); +} +EXPORT_SYMBOL(intel_scu_ipc_update_register); + +/** + * intel_scu_ipc_register_read - 32bit indirect read + * @addr: register address + * @value: 32bit value return + * + * Performs IA 32 bit indirect read, returns 0 on success, or an + * error code. + * + * Can be used when SCCB(System Controller Configuration Block) register + * HRIM(Honor Restricted IPC Messages) is set (bit 23) + * + * This function may sleep. Locking for SCU accesses is handled for + * the caller. + */ +int intel_scu_ipc_register_read(u32 addr, u32 *value) +{ + u32 err = 0; + + mutex_lock(&ipclock); + if (ipcdev.pdev == NULL) { + mutex_unlock(&ipclock); + return -ENODEV; + } + ipc_write_sptr(addr); + ipc_command(4 << 16 | IPC_CMD_INDIRECT_RD); + err = busy_loop(); + *value = ipc_data_readl(0); + mutex_unlock(&ipclock); + return err; +} +EXPORT_SYMBOL(intel_scu_ipc_register_read); + +/** + * intel_scu_ipc_register_write - 32bit indirect write + * @addr: register address + * @value: 32bit value to write + * + * Performs IA 32 bit indirect write, returns 0 on success, or an + * error code. + * + * Can be used when SCCB(System Controller Configuration Block) register + * HRIM(Honor Restricted IPC Messages) is set (bit 23) + * + * This function may sleep. Locking for SCU accesses is handled for + * the caller. + */ +int intel_scu_ipc_register_write(u32 addr, u32 value) +{ + u32 err = 0; + + mutex_lock(&ipclock); + if (ipcdev.pdev == NULL) { + mutex_unlock(&ipclock); + return -ENODEV; + } + ipc_write_dptr(addr); + ipc_data_writel(value, 0); + ipc_command(4 << 16 | IPC_CMD_INDIRECT_WR); + err = busy_loop(); + mutex_unlock(&ipclock); + return err; +} +EXPORT_SYMBOL(intel_scu_ipc_register_write); + +/** + * intel_scu_ipc_simple_command - send a simple command + * @cmd: command + * @sub: sub type + * + * Issue a simple command to the SCU. Do not use this interface if + * you must then access data as any data values may be overwritten + * by another SCU access by the time this function returns. + * + * This function may sleep. Locking for SCU accesses is handled for + * the caller. + */ +int intel_scu_ipc_simple_command(int cmd, int sub) +{ + u32 err = 0; + + mutex_lock(&ipclock); + if (ipcdev.pdev == NULL) { + mutex_unlock(&ipclock); + return -ENODEV; + } + ipc_command(cmd << 12 | sub); + err = busy_loop(); + mutex_unlock(&ipclock); + return err; +} +EXPORT_SYMBOL(intel_scu_ipc_simple_command); + +/** + * intel_scu_ipc_command - command with data + * @cmd: command + * @sub: sub type + * @in: input data + * @inlen: input length + * @out: output data + * @outlein: output length + * + * Issue a command to the SCU which involves data transfers. Do the + * data copies under the lock but leave it for the caller to interpret + */ + +int intel_scu_ipc_command(int cmd, int sub, u32 *in, int inlen, + u32 *out, int outlen) +{ + u32 err = 0; + int i = 0; + + mutex_lock(&ipclock); + if (ipcdev.pdev == NULL) { + mutex_unlock(&ipclock); + return -ENODEV; + } + + for (i = 0; i < inlen; i++) + ipc_data_writel(*in++, 4 * i); + + ipc_command((cmd << 12) | sub | (inlen << 18)); + err = busy_loop(); + + for (i = 0; i < outlen; i++) + *out++ = ipc_data_readl(4 * i); + + mutex_unlock(&ipclock); + return err; +} +EXPORT_SYMBOL(intel_scu_ipc_command); + +/*I2C commands */ +#define IPC_I2C_WRITE 1 /* I2C Write command */ +#define IPC_I2C_READ 2 /* I2C Read command */ + +/** + * intel_scu_ipc_i2c_cntrl - I2C read/write operations + * @addr: I2C address + command bits + * @data: data to read/write + * + * Perform an an I2C read/write operation via the SCU. All locking is + * handled for the caller. This function may sleep. + * + * Returns an error code or 0 on success. + * + * This has to be in the IPC driver for the locking. + */ +int intel_scu_ipc_i2c_cntrl(u32 addr, u32 *data) +{ + u32 cmd = 0; + + mutex_lock(&ipclock); + cmd = (addr >> 24) & 0xFF; + if (cmd == IPC_I2C_READ) { + writel(addr, ipcdev.i2c_base + IPC_I2C_CNTRL_ADDR); + /* Write not getting updated without delay */ + mdelay(1); + *data = readl(ipcdev.i2c_base + I2C_DATA_ADDR); + } else if (cmd == IPC_I2C_WRITE) { + writel(addr, ipcdev.i2c_base + I2C_DATA_ADDR); + mdelay(1); + writel(addr, ipcdev.i2c_base + IPC_I2C_CNTRL_ADDR); + } else { + dev_err(&ipcdev.pdev->dev, + "intel_scu_ipc: I2C INVALID_CMD = 0x%x\n", cmd); + + mutex_unlock(&ipclock); + return -1; + } + mutex_unlock(&ipclock); + return 0; +} +EXPORT_SYMBOL(intel_scu_ipc_i2c_cntrl); + +#define IPC_FW_LOAD_ADDR 0xFFFC0000 /* Storage location for FW image */ +#define IPC_FW_UPDATE_MBOX_ADDR 0xFFFFDFF4 /* Mailbox between ipc and scu */ +#define IPC_MAX_FW_SIZE 262144 /* 256K storage size for loading the FW image */ +#define IPC_FW_MIP_HEADER_SIZE 2048 /* Firmware MIP header size */ +/* IPC inform SCU to get ready for update process */ +#define IPC_CMD_FW_UPDATE_READY 0x10FE +/* IPC inform SCU to go for update process */ +#define IPC_CMD_FW_UPDATE_GO 0x20FE +/* Status code for fw update */ +#define IPC_FW_UPDATE_SUCCESS 0x444f4e45 /* Status code 'DONE' */ +#define IPC_FW_UPDATE_BADN 0x4241444E /* Status code 'BADN' */ +#define IPC_FW_TXHIGH 0x54784849 /* Status code 'IPC_FW_TXHIGH' */ +#define IPC_FW_TXLOW 0x54784c4f /* Status code 'IPC_FW_TXLOW' */ + +struct fw_update_mailbox { + u32 status; + u32 scu_flag; + u32 driver_flag; +}; + + +/** + * intel_scu_ipc_fw_update - Firmware update utility + * @buffer: firmware buffer + * @length: size of firmware buffer + * + * This function provides an interface to load the firmware into + * the SCU. Returns 0 on success or -1 on failure + */ +int intel_scu_ipc_fw_update(u8 *buffer, u32 length) +{ + void __iomem *fw_update_base; + struct fw_update_mailbox __iomem *mailbox = NULL; + int retry_cnt = 0; + u32 status; + + mutex_lock(&ipclock); + fw_update_base = ioremap_nocache(IPC_FW_LOAD_ADDR, (128*1024)); + if (fw_update_base == NULL) { + mutex_unlock(&ipclock); + return -ENOMEM; + } + mailbox = ioremap_nocache(IPC_FW_UPDATE_MBOX_ADDR, + sizeof(struct fw_update_mailbox)); + if (mailbox == NULL) { + iounmap(fw_update_base); + mutex_unlock(&ipclock); + return -ENOMEM; + } + + ipc_command(IPC_CMD_FW_UPDATE_READY); + + /* Intitialize mailbox */ + writel(0, &mailbox->status); + writel(0, &mailbox->scu_flag); + writel(0, &mailbox->driver_flag); + + /* Driver copies the 2KB MIP header to SRAM at 0xFFFC0000*/ + memcpy_toio(fw_update_base, buffer, 0x800); + + /* Driver sends "FW Update" IPC command (CMD_ID 0xFE; MSG_ID 0x02). + * Upon receiving this command, SCU will write the 2K MIP header + * from 0xFFFC0000 into NAND. + * SCU will write a status code into the Mailbox, and then set scu_flag. + */ + + ipc_command(IPC_CMD_FW_UPDATE_GO); + + /*Driver stalls until scu_flag is set */ + while (readl(&mailbox->scu_flag) != 1) { + rmb(); + mdelay(1); + } + + /* Driver checks Mailbox status. + * If the status is 'BADN', then abort (bad NAND). + * If the status is 'IPC_FW_TXLOW', then continue. + */ + while (readl(&mailbox->status) != IPC_FW_TXLOW) { + rmb(); + mdelay(10); + } + mdelay(10); + +update_retry: + if (retry_cnt > 5) + goto update_end; + + if (readl(&mailbox->status) != IPC_FW_TXLOW) + goto update_end; + buffer = buffer + 0x800; + memcpy_toio(fw_update_base, buffer, 0x20000); + writel(1, &mailbox->driver_flag); + while (readl(&mailbox->scu_flag) == 1) { + rmb(); + mdelay(1); + } + + /* check for 'BADN' */ + if (readl(&mailbox->status) == IPC_FW_UPDATE_BADN) + goto update_end; + + while (readl(&mailbox->status) != IPC_FW_TXHIGH) { + rmb(); + mdelay(10); + } + mdelay(10); + + if (readl(&mailbox->status) != IPC_FW_TXHIGH) + goto update_end; + + buffer = buffer + 0x20000; + memcpy_toio(fw_update_base, buffer, 0x20000); + writel(0, &mailbox->driver_flag); + + while (mailbox->scu_flag == 0) { + rmb(); + mdelay(1); + } + + /* check for 'BADN' */ + if (readl(&mailbox->status) == IPC_FW_UPDATE_BADN) + goto update_end; + + if (readl(&mailbox->status) == IPC_FW_TXLOW) { + ++retry_cnt; + goto update_retry; + } + +update_end: + status = readl(&mailbox->status); + + iounmap(fw_update_base); + iounmap(mailbox); + mutex_unlock(&ipclock); + + if (status == IPC_FW_UPDATE_SUCCESS) + return 0; + return -1; +} +EXPORT_SYMBOL(intel_scu_ipc_fw_update); + +/* + * Interrupt handler gets called when ioc bit of IPC_COMMAND_REG set to 1 + * When ioc bit is set to 1, caller api must wait for interrupt handler called + * which in turn unlocks the caller api. Currently this is not used + * + * This is edge triggered so we need take no action to clear anything + */ +static irqreturn_t ioc(int irq, void *dev_id) +{ + return IRQ_HANDLED; +} + +/** + * ipc_probe - probe an Intel SCU IPC + * @dev: the PCI device matching + * @id: entry in the match table + * + * Enable and install an intel SCU IPC. This appears in the PCI space + * but uses some hard coded addresses as well. + */ +static int ipc_probe(struct pci_dev *dev, const struct pci_device_id *id) +{ + int err; + resource_size_t pci_resource; + + if (ipcdev.pdev) /* We support only one SCU */ + return -EBUSY; + + ipcdev.pdev = pci_dev_get(dev); + + err = pci_enable_device(dev); + if (err) + return err; + + err = pci_request_regions(dev, "intel_scu_ipc"); + if (err) + return err; + + pci_resource = pci_resource_start(dev, 0); + if (!pci_resource) + return -ENOMEM; + + if (request_irq(dev->irq, ioc, 0, "intel_scu_ipc", &ipcdev)) + return -EBUSY; + + ipcdev.ipc_base = ioremap_nocache(IPC_BASE_ADDR, IPC_MAX_ADDR); + if (!ipcdev.ipc_base) + return -ENOMEM; + + ipcdev.i2c_base = ioremap_nocache(IPC_I2C_BASE, IPC_I2C_MAX_ADDR); + if (!ipcdev.i2c_base) { + iounmap(ipcdev.ipc_base); + return -ENOMEM; + } + return 0; +} + +/** + * ipc_remove - remove a bound IPC device + * @pdev: PCI device + * + * In practice the SCU is not removable but this function is also + * called for each device on a module unload or cleanup which is the + * path that will get used. + * + * Free up the mappings and release the PCI resources + */ +static void ipc_remove(struct pci_dev *pdev) +{ + free_irq(pdev->irq, &ipcdev); + pci_release_regions(pdev); + pci_dev_put(ipcdev.pdev); + iounmap(ipcdev.ipc_base); + iounmap(ipcdev.i2c_base); + ipcdev.pdev = NULL; +} + +static const struct pci_device_id pci_ids[] = { + {PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x080e)}, + { 0,} +}; +MODULE_DEVICE_TABLE(pci, pci_ids); + +static struct pci_driver ipc_driver = { + .name = "intel_scu_ipc", + .id_table = pci_ids, + .probe = ipc_probe, + .remove = ipc_remove, +}; + + +static int __init intel_scu_ipc_init(void) +{ + return pci_register_driver(&ipc_driver); +} + +static void __exit intel_scu_ipc_exit(void) +{ + pci_unregister_driver(&ipc_driver); +} + +MODULE_AUTHOR("Sreedhara DS <sreedhara.ds@intel.com>"); +MODULE_DESCRIPTION("Intel SCU IPC driver"); +MODULE_LICENSE("GPL"); + +module_init(intel_scu_ipc_init); +module_exit(intel_scu_ipc_exit); |