void imx6q_restart(char mode, const char *cmd)
{
struct device_node *np;
void __iomem *wdog_base;
np = of_find_compatible_node(NULL, NULL, "fsl,imx6q-wdt");
wdog_base = of_iomap(np, 0);
if (!wdog_base)
goto soft;
imx_src_prepare_restart();
/* enable wdog */
writew_relaxed(1 << 2, wdog_base);
/* write twice to ensure the request will not get ignored */
writew_relaxed(1 << 2, wdog_base);
/* wait for reset to assert ... */
mdelay(500);
pr_err("Watchdog reset failed to assert reset\n");
/* delay to allow the serial port to show the message */
mdelay(50);
soft:
/* we'll take a jump through zero as a poor second */
soft_restart(0);
}
static int cpc_write(struct cpc_reg *reg, u64 val)
{
int ret_val = 0;
if (reg->space_id == ACPI_ADR_SPACE_PLATFORM_COMM) {
void __iomem *vaddr = GET_PCC_VADDR(reg->address);
switch (reg->bit_width) {
case 8:
writeb_relaxed(val, vaddr);
break;
case 16:
writew_relaxed(val, vaddr);
break;
case 32:
writel_relaxed(val, vaddr);
break;
case 64:
writeq_relaxed(val, vaddr);
break;
default:
pr_debug("Error: Cannot write %u bit width to PCC\n",
reg->bit_width);
ret_val = -EFAULT;
break;
}
} else
ret_val = acpi_os_write_memory((acpi_physical_address)reg->address,
val, reg->bit_width);
return ret_val;
}
static void stm_send(void __iomem *addr, const void *data,
u32 size, u8 write_bytes)
{
u8 paload[8];
if (stm_addr_unaligned(data, write_bytes)) {
memcpy(paload, data, size);
data = paload;
}
/* now we are 64bit/32bit aligned */
switch (size) {
#ifdef CONFIG_64BIT
case 8:
writeq_relaxed(*(u64 *)data, addr);
break;
#endif
case 4:
writel_relaxed(*(u32 *)data, addr);
break;
case 2:
writew_relaxed(*(u16 *)data, addr);
break;
case 1:
writeb_relaxed(*(u8 *)data, addr);
break;
default:
break;
}
}
static inline void vf610_mscm_ir_restore(struct vf610_mscm_ir_chip_data *data)
{
int i;
for (i = 0; i < MSCM_IRSPRC_NUM; i++)
writew_relaxed(data->saved_irsprc[i], data->mscm_ir_base + MSCM_IRSPRC(i));
}
static inline void sdhci_sprd_writew(struct sdhci_host *host, u16 val, int reg)
{
/* SDHCI_BLOCK_COUNT is Read Only on Spreadtrum's platform */
if (unlikely(reg == SDHCI_BLOCK_COUNT))
return;
writew_relaxed(val, host->ioaddr + reg);
}
static void vf610_mscm_ir_disable(struct irq_data *data)
{
irq_hw_number_t hwirq = data->hwirq;
struct vf610_mscm_ir_chip_data *chip_data = data->chip_data;
writew_relaxed(0x0, chip_data->mscm_ir_base + MSCM_IRSPRC(hwirq));
irq_chip_mask_parent(data);
}
/* This function may sleep*/
static void sdhci_msm_writew(struct sdhci_host *host, u16 val, int reg)
{
u32 req_type = 0;
req_type = __sdhci_msm_check_write(host, val, reg);
writew_relaxed(val, host->ioaddr + reg);
if (req_type)
sdhci_msm_check_power_status(host, req_type);
}
static void omap_mcbsp_write(struct omap_mcbsp *mcbsp, u16 reg, u32 val)
{
void __iomem *addr = mcbsp->io_base + reg * mcbsp->pdata->reg_step;
if (mcbsp->pdata->reg_size == 2) {
((u16 *)mcbsp->reg_cache)[reg] = (u16)val;
writew_relaxed((u16)val, addr);
} else {
((u32 *)mcbsp->reg_cache)[reg] = val;
writel_relaxed(val, addr);
}
}
static void vf610_mscm_ir_enable(struct irq_data *data)
{
irq_hw_number_t hwirq = data->hwirq;
struct vf610_mscm_ir_chip_data *chip_data = data->chip_data;
u16 irsprc;
irsprc = readw_relaxed(chip_data->mscm_ir_base + MSCM_IRSPRC(hwirq));
irsprc &= MSCM_IRSPRC_CPEN_MASK;
WARN_ON(irsprc & ~chip_data->cpu_mask);
writew_relaxed(chip_data->cpu_mask,
chip_data->mscm_ir_base + MSCM_IRSPRC(hwirq));
irq_chip_unmask_parent(data);
}
static int cpc_write(int cpu, struct cpc_register_resource *reg_res, u64 val)
{
int ret_val = 0;
void __iomem *vaddr = 0;
int pcc_ss_id = per_cpu(cpu_pcc_subspace_idx, cpu);
struct cpc_reg *reg = ®_res->cpc_entry.reg;
if (reg->space_id == ACPI_ADR_SPACE_PLATFORM_COMM && pcc_ss_id >= 0)
vaddr = GET_PCC_VADDR(reg->address, pcc_ss_id);
else if (reg->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
vaddr = reg_res->sys_mem_vaddr;
else if (reg->space_id == ACPI_ADR_SPACE_FIXED_HARDWARE)
return cpc_write_ffh(cpu, reg, val);
else
return acpi_os_write_memory((acpi_physical_address)reg->address,
val, reg->bit_width);
switch (reg->bit_width) {
case 8:
writeb_relaxed(val, vaddr);
break;
case 16:
writew_relaxed(val, vaddr);
break;
case 32:
writel_relaxed(val, vaddr);
break;
case 64:
writeq_relaxed(val, vaddr);
break;
default:
pr_debug("Error: Cannot write %u bit width to PCC\n",
reg->bit_width);
ret_val = -EFAULT;
break;
}
return ret_val;
}
static void restore_uart(void)
{
int cnt;
int retries = 100;
unsigned int cr;
void __iomem *membase;
u16 dummy;
bool show_warn = false;
membase = context_uart.base;
clk_enable(context_uart.uart_clk);
writew_relaxed(context_uart.ifls, membase + UART011_IFLS);
cr = UART01x_CR_UARTEN | UART011_CR_TXE | UART011_CR_LBE;
writew_relaxed(cr, membase + UART011_CR);
writew_relaxed(0, membase + UART011_FBRD);
writew_relaxed(1, membase + UART011_IBRD);
writew_relaxed(0, membase + ST_UART011_LCRH_RX);
if (context_uart.lcrh_tx != ST_UART011_LCRH_RX) {
int i;
/*
* Wait 10 PCLKs before writing LCRH_TX register,
* to get this delay write read only register 10 times
*/
for (i = 0; i < 10; ++i)
dummy = readw(membase + ST_UART011_LCRH_RX);
writew_relaxed(0, membase + ST_UART011_LCRH_TX);
}
writew(0, membase + UART01x_DR);
do {
if (!(readw(membase + UART01x_FR) & UART01x_FR_BUSY))
break;
cpu_relax();
} while (retries-- > 0);
if (retries < 0)
/*
* We can't print out a warning here since the uart is
* not fully restored. Do it later.
*/
show_warn = true;
writel_relaxed(context_uart.dma_wm, membase + ST_UART011_DMAWM);
writel_relaxed(context_uart.timeout, membase + ST_UART011_TIMEOUT);
writel_relaxed(context_uart.lcrh_rx, membase + ST_UART011_LCRH_RX);
writel_relaxed(context_uart.ilpr, membase + UART01x_ILPR);
writel_relaxed(context_uart.ibrd, membase + UART011_IBRD);
writel_relaxed(context_uart.fbrd, membase + UART011_FBRD);
/*
* Wait 10 PCLKs before writing LCRH_TX register,
* to get this delay write read only register 10-3
* times, as already there are 3 writes after
* ST_UART011_LCRH_RX
*/
for (cnt = 0; cnt < 7; cnt++)
dummy = readw(membase + ST_UART011_LCRH_RX);
writel_relaxed(context_uart.lcrh_tx, membase + ST_UART011_LCRH_TX);
writel_relaxed(context_uart.ifls, membase + UART011_IFLS);
writel_relaxed(context_uart.dmacr, membase + UART011_DMACR);
writel_relaxed(context_uart.xfcr, membase + ST_UART011_XFCR);
writel_relaxed(context_uart.xon1, membase + ST_UART011_XON1);
writel_relaxed(context_uart.xon2, membase + ST_UART011_XON2);
writel_relaxed(context_uart.xoff1, membase + ST_UART011_XOFF1);
writel_relaxed(context_uart.xoff2, membase + ST_UART011_XOFF2);
writel_relaxed(context_uart.abcr, membase + ST_UART011_ABCR);
writel_relaxed(context_uart.abimsc, membase + ST_UART011_ABIMSC);
writel_relaxed(context_uart.cr, membase + UART011_CR);
writel(context_uart.imsc, membase + UART011_IMSC);
clk_disable(context_uart.uart_clk);
if (show_warn)
pr_warning("%s:uart tx busy\n", __func__);
}
static inline void omap_i2c_write_reg(struct omap_i2c_dev *i2c_dev,
int reg, u16 val)
{
writew_relaxed(val, i2c_dev->base +
(i2c_dev->regs[reg] << i2c_dev->reg_shift));
}
static inline void ti_dma_xbar_write(void __iomem *iomem, int xbar, u16 val)
{
writew_relaxed(val, iomem + (xbar * 2));
}
/*
* This function transfers the ownership of the PCC to the platform
* So it must be called while holding write_lock(pcc_lock)
*/
static int send_pcc_cmd(int pcc_ss_id, u16 cmd)
{
int ret = -EIO, i;
struct cppc_pcc_data *pcc_ss_data = pcc_data[pcc_ss_id];
struct acpi_pcct_shared_memory *generic_comm_base =
(struct acpi_pcct_shared_memory *)pcc_ss_data->pcc_comm_addr;
unsigned int time_delta;
/*
* For CMD_WRITE we know for a fact the caller should have checked
* the channel before writing to PCC space
*/
if (cmd == CMD_READ) {
/*
* If there are pending cpc_writes, then we stole the channel
* before write completion, so first send a WRITE command to
* platform
*/
if (pcc_ss_data->pending_pcc_write_cmd)
send_pcc_cmd(pcc_ss_id, CMD_WRITE);
ret = check_pcc_chan(pcc_ss_id, false);
if (ret)
goto end;
} else /* CMD_WRITE */
pcc_ss_data->pending_pcc_write_cmd = FALSE;
/*
* Handle the Minimum Request Turnaround Time(MRTT)
* "The minimum amount of time that OSPM must wait after the completion
* of a command before issuing the next command, in microseconds"
*/
if (pcc_ss_data->pcc_mrtt) {
time_delta = ktime_us_delta(ktime_get(),
pcc_ss_data->last_cmd_cmpl_time);
if (pcc_ss_data->pcc_mrtt > time_delta)
udelay(pcc_ss_data->pcc_mrtt - time_delta);
}
/*
* Handle the non-zero Maximum Periodic Access Rate(MPAR)
* "The maximum number of periodic requests that the subspace channel can
* support, reported in commands per minute. 0 indicates no limitation."
*
* This parameter should be ideally zero or large enough so that it can
* handle maximum number of requests that all the cores in the system can
* collectively generate. If it is not, we will follow the spec and just
* not send the request to the platform after hitting the MPAR limit in
* any 60s window
*/
if (pcc_ss_data->pcc_mpar) {
if (pcc_ss_data->mpar_count == 0) {
time_delta = ktime_ms_delta(ktime_get(),
pcc_ss_data->last_mpar_reset);
if ((time_delta < 60 * MSEC_PER_SEC) && pcc_ss_data->last_mpar_reset) {
pr_debug("PCC cmd not sent due to MPAR limit");
ret = -EIO;
goto end;
}
pcc_ss_data->last_mpar_reset = ktime_get();
pcc_ss_data->mpar_count = pcc_ss_data->pcc_mpar;
}
pcc_ss_data->mpar_count--;
}
/* Write to the shared comm region. */
writew_relaxed(cmd, &generic_comm_base->command);
/* Flip CMD COMPLETE bit */
writew_relaxed(0, &generic_comm_base->status);
pcc_ss_data->platform_owns_pcc = true;
/* Ring doorbell */
ret = mbox_send_message(pcc_ss_data->pcc_channel, &cmd);
if (ret < 0) {
pr_err("Err sending PCC mbox message. cmd:%d, ret:%d\n",
cmd, ret);
goto end;
}
/* wait for completion and check for PCC errro bit */
ret = check_pcc_chan(pcc_ss_id, true);
if (pcc_ss_data->pcc_mrtt)
pcc_ss_data->last_cmd_cmpl_time = ktime_get();
if (pcc_ss_data->pcc_channel->mbox->txdone_irq)
mbox_chan_txdone(pcc_ss_data->pcc_channel, ret);
else
mbox_client_txdone(pcc_ss_data->pcc_channel, ret);
end:
if (cmd == CMD_WRITE) {
if (unlikely(ret)) {
for_each_possible_cpu(i) {
struct cpc_desc *desc = per_cpu(cpc_desc_ptr, i);
if (!desc)
continue;
if (desc->write_cmd_id == pcc_ss_data->pcc_write_cnt)
desc->write_cmd_status = ret;
}
}
pcc_ss_data->pcc_write_cnt++;
wake_up_all(&pcc_ss_data->pcc_write_wait_q);
}
return ret;
}
void omap_ctrl_writew(u16 val, u16 offset)
{
writew_relaxed(val, OMAP_CTRL_REGADDR(offset));
}
static int send_pcc_cmd(u16 cmd)
{
int ret = -EIO;
struct acpi_pcct_shared_memory *generic_comm_base =
(struct acpi_pcct_shared_memory *) pcc_comm_addr;
static ktime_t last_cmd_cmpl_time, last_mpar_reset;
static int mpar_count;
unsigned int time_delta;
/*
* For CMD_WRITE we know for a fact the caller should have checked
* the channel before writing to PCC space
*/
if (cmd == CMD_READ) {
ret = check_pcc_chan();
if (ret)
return ret;
}
/*
* Handle the Minimum Request Turnaround Time(MRTT)
* "The minimum amount of time that OSPM must wait after the completion
* of a command before issuing the next command, in microseconds"
*/
if (pcc_mrtt) {
time_delta = ktime_us_delta(ktime_get(), last_cmd_cmpl_time);
if (pcc_mrtt > time_delta)
udelay(pcc_mrtt - time_delta);
}
/*
* Handle the non-zero Maximum Periodic Access Rate(MPAR)
* "The maximum number of periodic requests that the subspace channel can
* support, reported in commands per minute. 0 indicates no limitation."
*
* This parameter should be ideally zero or large enough so that it can
* handle maximum number of requests that all the cores in the system can
* collectively generate. If it is not, we will follow the spec and just
* not send the request to the platform after hitting the MPAR limit in
* any 60s window
*/
if (pcc_mpar) {
if (mpar_count == 0) {
time_delta = ktime_ms_delta(ktime_get(), last_mpar_reset);
if (time_delta < 60 * MSEC_PER_SEC) {
pr_debug("PCC cmd not sent due to MPAR limit");
return -EIO;
}
last_mpar_reset = ktime_get();
mpar_count = pcc_mpar;
}
mpar_count--;
}
/* Write to the shared comm region. */
writew_relaxed(cmd, &generic_comm_base->command);
/* Flip CMD COMPLETE bit */
writew_relaxed(0, &generic_comm_base->status);
/* Ring doorbell */
ret = mbox_send_message(pcc_channel, &cmd);
if (ret < 0) {
pr_err("Err sending PCC mbox message. cmd:%d, ret:%d\n",
cmd, ret);
return ret;
}
/*
* For READs we need to ensure the cmd completed to ensure
* the ensuing read()s can proceed. For WRITEs we dont care
* because the actual write()s are done before coming here
* and the next READ or WRITE will check if the channel
* is busy/free at the entry of this call.
*
* If Minimum Request Turnaround Time is non-zero, we need
* to record the completion time of both READ and WRITE
* command for proper handling of MRTT, so we need to check
* for pcc_mrtt in addition to CMD_READ
*/
if (cmd == CMD_READ || pcc_mrtt) {
ret = check_pcc_chan();
if (pcc_mrtt)
last_cmd_cmpl_time = ktime_get();
}
mbox_client_txdone(pcc_channel, ret);
return ret;
}
