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ipc: Added support for IPC interrupt mode 

This patch adds support for ipc command interrupt mode.
Also added platform data option to select 'irq_mode'

irq_mode = 1: configure the driver to receive IOC interrupt
for each successful ipc_command.

irq_mode = 0: makes driver use polling method to
track the command completion status.

Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
Signed-off-by: David Cohen <david.a.cohen@linux.intel.com>
Signed-off-by: Matthew Garrett <matthew.garrett@nebula.com>
This commit is contained in:
Kuppuswamy Sathyanarayanan 2013-11-15 16:21:54 -08:00 committed by Matthew Garrett
parent c7094d1d99
commit ed12f295bf
1 changed files with 45 additions and 3 deletions
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48
drivers/platform/x86/intel_scu_ipc.c
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@ -60,6 +60,7 @@
#define IPC_WWBUF_SIZE 20 /* IPC Write buffer Size */
#define IPC_RWBUF_SIZE 20 /* IPC Read buffer Size */
#define IPC_IOC 0x100 /* IPC command register IOC bit */
enum {
SCU_IPC_LINCROFT,
@ -74,6 +75,7 @@ struct intel_scu_ipc_pdata_t {
u32 i2c_base;
u32 ipc_len;
u32 i2c_len;
u8 irq_mode;
};
static struct intel_scu_ipc_pdata_t intel_scu_ipc_pdata[] = {
@ -82,24 +84,28 @@ static struct intel_scu_ipc_pdata_t intel_scu_ipc_pdata[] = {
.i2c_base = 0xff12b000,
.ipc_len = 0x100,
.i2c_len = 0x10,
.irq_mode = 0,
},
[SCU_IPC_PENWELL] = {
.ipc_base = 0xff11c000,
.i2c_base = 0xff12b000,
.ipc_len = 0x100,
.i2c_len = 0x10,
.irq_mode = 1,
},
[SCU_IPC_CLOVERVIEW] = {
.ipc_base = 0xff11c000,
.i2c_base = 0xff12b000,
.ipc_len = 0x100,
.i2c_len = 0x10,
.irq_mode = 1,
},
[SCU_IPC_TANGIER] = {
.ipc_base = 0xff009000,
.i2c_base = 0xff00d000,
.ipc_len = 0x100,
.i2c_len = 0x10,
.irq_mode = 0,
},
};
@ -110,6 +116,8 @@ struct intel_scu_ipc_dev {
struct pci_dev *pdev;
void __iomem *ipc_base;
void __iomem *i2c_base;
struct completion cmd_complete;
u8 irq_mode;
};
static struct intel_scu_ipc_dev ipcdev; /* Only one for now */
@ -136,6 +144,10 @@ static DEFINE_MUTEX(ipclock); /* lock used to prevent multiple call to SCU */
*/
static inline void ipc_command(u32 cmd) /* Send ipc command */
{
if (ipcdev.irq_mode) {
reinit_completion(&ipcdev.cmd_complete);
writel(cmd | IPC_IOC, ipcdev.ipc_base);
}
writel(cmd, ipcdev.ipc_base);
}
@ -194,6 +206,30 @@ static inline int busy_loop(void) /* Wait till scu status is busy */
return 0;
}
/* Wait till ipc ioc interrupt is received or timeout in 3 HZ */
static inline int ipc_wait_for_interrupt(void)
{
int status;
if (!wait_for_completion_timeout(&ipcdev.cmd_complete, 3 * HZ)) {
struct device *dev = &ipcdev.pdev->dev;
dev_err(dev, "IPC timed out\n");
return -ETIMEDOUT;
}
status = ipc_read_status();
if ((status >> 1) & 1)
return -EIO;
return 0;
}
int intel_scu_ipc_check_status(void)
{
return ipcdev.irq_mode ? ipc_wait_for_interrupt() : busy_loop();
}
/* 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)
{
@ -234,7 +270,7 @@ static int pwr_reg_rdwr(u16 *addr, u8 *data, u32 count, u32 op, u32 id)
ipc_command(4 << 16 | id << 12 | 0 << 8 | op);
}
err = busy_loop();
err = intel_scu_ipc_check_status();
if (!err && id == IPC_CMD_PCNTRL_R) { /* Read rbuf */
/* Workaround: values are read as 0 without memcpy_fromio */
memcpy_fromio(cbuf, ipcdev.ipc_base + 0x90, 16);
@ -429,7 +465,7 @@ int intel_scu_ipc_simple_command(int cmd, int sub)
return -ENODEV;
}
ipc_command(sub << 12 | cmd);
err = busy_loop();
err = intel_scu_ipc_check_status();
mutex_unlock(&ipclock);
return err;
}
@ -463,7 +499,7 @@ int intel_scu_ipc_command(int cmd, int sub, u32 *in, int inlen,
ipc_data_writel(*in++, 4 * i);
ipc_command((inlen << 16) | (sub << 12) | cmd);
err = busy_loop();
err = intel_scu_ipc_check_status();
if (!err) {
for (i = 0; i < outlen; i++)
@ -531,6 +567,9 @@ EXPORT_SYMBOL(intel_scu_ipc_i2c_cntrl);
*/
static irqreturn_t ioc(int irq, void *dev_id)
{
if (ipcdev.irq_mode)
complete(&ipcdev.cmd_complete);
return IRQ_HANDLED;
}
@ -555,6 +594,7 @@ static int ipc_probe(struct pci_dev *dev, const struct pci_device_id *id)
pdata = &intel_scu_ipc_pdata[pid];
ipcdev.pdev = pci_dev_get(dev);
ipcdev.irq_mode = pdata->irq_mode;
err = pci_enable_device(dev);
if (err)
@ -568,6 +608,8 @@ static int ipc_probe(struct pci_dev *dev, const struct pci_device_id *id)
if (!pci_resource)
return -ENOMEM;
init_completion(&ipcdev.cmd_complete);
if (request_irq(dev->irq, ioc, 0, "intel_scu_ipc", &ipcdev))
return -EBUSY;