[PATCH 13/23] mfd/db5500-prcmu: update mailbox handling
From: Linus Walleij
Date: Fri Aug 12 2011 - 04:30:31 EST
From: Shreshtha Kumar Sahu <shreshthakumar.sahu@xxxxxxxxxxxxxx>
This updates the mailbox handling to be more robust and
adds basic infrastructure for event (IRQ) handling.
Signed-off-by: Shreshtha Kumar Sahu <shreshthakumar.sahu@xxxxxxxxxxxxxx>
Signed-off-by: Vijaya Kumar Kilari <vijay.kilari@xxxxxxxxxxxxxx>
Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
---
arch/arm/mach-ux500/include/mach/irqs-db5500.h | 29 ++
drivers/mfd/db5500-prcmu.c | 350 +++++++++++++++++++++++-
2 files changed, 370 insertions(+), 9 deletions(-)
diff --git a/arch/arm/mach-ux500/include/mach/irqs-db5500.h b/arch/arm/mach-ux500/include/mach/irqs-db5500.h
index 7723977..d8d00b6 100644
--- a/arch/arm/mach-ux500/include/mach/irqs-db5500.h
+++ b/arch/arm/mach-ux500/include/mach/irqs-db5500.h
@@ -85,6 +85,35 @@
#ifdef CONFIG_UX500_SOC_DB5500
+/* Virtual interrupts corresponding to the PRCMU wakeups. */
+#define IRQ_DB5500_PRCMU_BASE IRQ_SOC_START
+
+#define IRQ_DB5500_PRCMU_RTC (IRQ_DB5500_PRCMU_BASE)
+#define IRQ_DB5500_PRCMU_RTT0 (IRQ_DB5500_PRCMU_BASE + 1)
+#define IRQ_DB5500_PRCMU_RTT1 (IRQ_DB5500_PRCMU_BASE + 2)
+#define IRQ_DB5500_PRCMU_CD_IRQ (IRQ_DB5500_PRCMU_BASE + 3)
+#define IRQ_DB5500_PRCMU_SRP_TIM (IRQ_DB5500_PRCMU_BASE + 4)
+#define IRQ_DB5500_PRCMU_APE_REQ (IRQ_DB5500_PRCMU_BASE + 5)
+#define IRQ_DB5500_PRCMU_USB (IRQ_DB5500_PRCMU_BASE + 6)
+#define IRQ_DB5500_PRCMU_ABB (IRQ_DB5500_PRCMU_BASE + 7)
+#define IRQ_DB5500_PRCMU_ARM (IRQ_DB5500_PRCMU_BASE + 8)
+#define IRQ_DB5500_PRCMU_MODEM_SW_RESET_REQ (IRQ_DB5500_PRCMU_BASE + 9)
+#define IRQ_DB5500_PRCMU_AC_WAKE_ACK (IRQ_DB5500_PRCMU_BASE + 10)
+#define IRQ_DB5500_PRCMU_GPIO0 (IRQ_DB5500_PRCMU_BASE + 11)
+#define IRQ_DB5500_PRCMU_GPIO1 (IRQ_DB5500_PRCMU_BASE + 12)
+#define IRQ_DB5500_PRCMU_GPIO2 (IRQ_DB5500_PRCMU_BASE + 13)
+#define IRQ_DB5500_PRCMU_GPIO3 (IRQ_DB5500_PRCMU_BASE + 14)
+#define IRQ_DB5500_PRCMU_GPIO4 (IRQ_DB5500_PRCMU_BASE + 15)
+#define IRQ_DB5500_PRCMU_GPIO5 (IRQ_DB5500_PRCMU_BASE + 16)
+#define IRQ_DB5500_PRCMU_GPIO6 (IRQ_DB5500_PRCMU_BASE + 17)
+#define IRQ_DB5500_PRCMU_GPIO7 (IRQ_DB5500_PRCMU_BASE + 18)
+#define IRQ_DB5500_PRCMU_AC_REL_ACK (IRQ_DB5500_PRCMU_BASE + 19)
+#define IRQ_DB5500_PRCMU_LOW_POWER_AUDIO (IRQ_DB5500_PRCMU_BASE + 20)
+#define IRQ_DB5500_PRCMU_TEMP_SENSOR (IRQ_DB5500_PRCMU_BASE + 21)
+#define IRQ_DB5500_PRCMU_END (IRQ_DB5500_PRCMU_BASE + 22)
+
+#define NUM_DB5500_PRCMU_WAKEUPS (IRQ_DB5500_PRCMU_END - IRQ_DB5500_PRCMU_BASE)
+
/*
* After the GPIO ones we reserve a range of IRQ:s in which virtual
* IRQ:s representing modem IRQ:s can be allocated
diff --git a/drivers/mfd/db5500-prcmu.c b/drivers/mfd/db5500-prcmu.c
index bb115b2..c8709b0 100644
--- a/drivers/mfd/db5500-prcmu.c
+++ b/drivers/mfd/db5500-prcmu.c
@@ -64,6 +64,47 @@
#define PRCM_ACK_MB6 (tcdm_base + 0xF0C)
#define PRCM_ACK_MB7 (tcdm_base + 0xF08)
+/* Mailbox 0 REQs */
+#define PRCM_REQ_MB0_AP_POWER_STATE (PRCM_REQ_MB0 + 0x0)
+#define PRCM_REQ_MB0_ULP_CLOCK_STATE (PRCM_REQ_MB0 + 0x1)
+#define PRCM_REQ_MB0_AP_PLL_STATE (PRCM_REQ_MB0 + 0x2)
+#define PRCM_REQ_MB0_DDR_STATE (PRCM_REQ_MB0 + 0x3)
+#define PRCM_REQ_MB0_ESRAM0_STATE (PRCM_REQ_MB0 + 0x4)
+#define PRCM_REQ_MB0_WAKEUP_DBB (PRCM_REQ_MB0 + 0x8)
+#define PRCM_REQ_MB0_WAKEUP_ABB (PRCM_REQ_MB0 + 0xC)
+
+/* Mailbox 0 ACKs */
+#define PRCM_ACK_MB0_AP_PWRSTTR_STATUS (PRCM_ACK_MB0 + 0x0)
+#define PRCM_ACK_MB0_READ_POINTER (PRCM_ACK_MB0 + 0x1)
+#define PRCM_ACK_MB0_WAKEUP_0_DBB (PRCM_ACK_MB0 + 0x4)
+#define PRCM_ACK_MB0_WAKEUP_0_ABB (PRCM_ACK_MB0 + 0x8)
+#define PRCM_ACK_MB0_WAKEUP_1_DBB (PRCM_ACK_MB0 + 0x28)
+#define PRCM_ACK_MB0_WAKEUP_1_ABB (PRCM_ACK_MB0 + 0x2C)
+#define PRCM_ACK_MB0_EVENT_ABB_NUMBERS 20
+
+/* Request mailbox 1 fields. */
+#define PRCM_REQ_MB1_ARM_OPP (PRCM_REQ_MB1 + 0x0)
+#define PRCM_REQ_MB1_APE_OPP (PRCM_REQ_MB1 + 0x1)
+
+/* Mailbox 1 ACKs */
+#define PRCM_ACK_MB1_CURRENT_ARM_OPP (PRCM_ACK_MB1 + 0x0)
+#define PRCM_ACK_MB1_CURRENT_APE_OPP (PRCM_ACK_MB1 + 0x1)
+#define PRCM_ACK_MB1_ARM_VOLT_STATUS (PRCM_ACK_MB1 + 0x2)
+#define PRCM_ACK_MB1_APE_VOLT_STATUS (PRCM_ACK_MB1 + 0x3)
+
+/* Mailbox 2 REQs */
+#define PRCM_REQ_MB2_EPOD_CLIENT (PRCM_REQ_MB2 + 0x0)
+#define PRCM_REQ_MB2_EPOD_STATE (PRCM_REQ_MB2 + 0x1)
+#define PRCM_REQ_MB2_CLK_CLIENT (PRCM_REQ_MB2 + 0x2)
+#define PRCM_REQ_MB2_CLK_STATE (PRCM_REQ_MB2 + 0x3)
+#define PRCM_REQ_MB2_PLL_CLIENT (PRCM_REQ_MB2 + 0x4)
+#define PRCM_REQ_MB2_PLL_STATE (PRCM_REQ_MB2 + 0x5)
+
+/* Mailbox 2 ACKs */
+#define PRCM_ACK_MB2_EPOD_STATUS (PRCM_ACK_MB2 + 0x2)
+#define PRCM_ACK_MB2_CLK_STATUS (PRCM_ACK_MB2 + 0x6)
+#define PRCM_ACK_MB2_PLL_STATUS (PRCM_ACK_MB2 + 0xA)
+
enum mb_return_code {
RC_SUCCESS,
RC_FAIL,
@@ -71,12 +112,36 @@ enum mb_return_code {
/* 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,
+ MB0H_WAKE_UP = 0,
+ /* request */
+ MB0H_PWR_STATE_TRANS,
+ MB0H_WAKE_UP_CFG,
+ MB0H_RD_WAKE_UP_ACK,
+};
+
+/* Mailbox 1 headers.*/
+enum mb1_header {
+ MB1H_ARM_OPP = 1,
+ MB1H_APE_OPP,
+ MB1H_ARM_APE_OPP,
+};
+
+/* Mailbox 2 headers. */
+enum mb2_header {
+ MB2H_EPOD_REQUEST = 1,
+ MB2H_CLK_REQUEST,
+ MB2H_PLL_REQUEST,
+};
+
+/* Mailbox 3 headers. */
+enum mb3_header {
+ MB3H_REFCLK_REQUEST = 1,
+};
+
+enum sysclk_state {
+ SYSCLK_OFF,
+ SYSCLK_ON,
};
/* Mailbox 5 headers. */
@@ -85,6 +150,46 @@ enum mb5_header {
MB5H_I2C_READ,
};
+enum db5500_arm_opp {
+ DB5500_ARM_100_OPP = 1,
+ DB5500_ARM_50_OPP,
+ DB5500_ARM_EXT_OPP,
+};
+
+enum epod_state {
+ EPOD_OFF,
+ EPOD_ON,
+};
+enum epod_onoffret_state {
+ EPOD_OOR_OFF,
+ EPOD_OOR_RET,
+ EPOD_OOR_ON,
+};
+enum db5500_prcmu_pll {
+ DB5500_PLL_SOC0,
+ DB5500_PLL_SOC1,
+ DB5500_PLL_DDR,
+ DB5500_NUM_PLL_ID,
+};
+
+enum on_off_ret {
+ OFF_ST,
+ RET_ST,
+ ON_ST,
+};
+
+enum db5500_ap_pwr_state {
+ DB5500_AP_SLEEP = 2,
+ DB5500_AP_DEEP_SLEEP,
+ DB5500_AP_IDLE,
+};
+
+/* Request mailbox 3 fields */
+#define PRCM_REQ_MB3_REFCLK_MGT (PRCM_REQ_MB3 + 0x0)
+
+/* Ack. mailbox 3 fields */
+#define PRCM_ACK_MB3_REFCLK_REQ (PRCM_ACK_MB3 + 0x0)
+
/* Request mailbox 5 fields. */
#define PRCM_REQ_MB5_I2C_SLAVE (PRCM_REQ_MB5 + 0)
#define PRCM_REQ_MB5_I2C_REG (PRCM_REQ_MB5 + 1)
@@ -125,13 +230,157 @@ enum mb5_header {
#define PRCMU_PLLDSI_LOCKP_LOCKED 0x3
/*
+ * Wakeups/IRQs
+ */
+
+#define WAKEUP_BIT_RTC BIT(0)
+#define WAKEUP_BIT_RTT0 BIT(1)
+#define WAKEUP_BIT_RTT1 BIT(2)
+#define WAKEUP_BIT_CD_IRQ BIT(3)
+#define WAKEUP_BIT_SRP_TIM BIT(4)
+#define WAKEUP_BIT_APE_REQ BIT(5)
+#define WAKEUP_BIT_USB BIT(6)
+#define WAKEUP_BIT_ABB BIT(7)
+#define WAKEUP_BIT_LOW_POWER_AUDIO BIT(8)
+#define WAKEUP_BIT_TEMP_SENSOR BIT(9)
+#define WAKEUP_BIT_ARM BIT(10)
+#define WAKEUP_BIT_AC_WAKE_ACK BIT(11)
+#define WAKEUP_BIT_MODEM_SW_RESET_REQ BIT(20)
+#define WAKEUP_BIT_GPIO0 BIT(23)
+#define WAKEUP_BIT_GPIO1 BIT(24)
+#define WAKEUP_BIT_GPIO2 BIT(25)
+#define WAKEUP_BIT_GPIO3 BIT(26)
+#define WAKEUP_BIT_GPIO4 BIT(27)
+#define WAKEUP_BIT_GPIO5 BIT(28)
+#define WAKEUP_BIT_GPIO6 BIT(29)
+#define WAKEUP_BIT_GPIO7 BIT(30)
+#define WAKEUP_BIT_AC_REL_ACK BIT(30)
+
+/*
+ * This vector maps irq numbers to the bits in the bit field used in
+ * communication with the PRCMU firmware.
+ *
+ * The reason for having this is to keep the irq numbers contiguous even though
+ * the bits in the bit field are not. (The bits also have a tendency to move
+ * around, to further complicate matters.)
+ */
+#define IRQ_INDEX(_name) ((IRQ_DB5500_PRCMU_##_name) - IRQ_DB5500_PRCMU_BASE)
+#define IRQ_ENTRY(_name)[IRQ_INDEX(_name)] = (WAKEUP_BIT_##_name)
+static u32 prcmu_irq_bit[NUM_DB5500_PRCMU_WAKEUPS] = {
+ IRQ_ENTRY(RTC),
+ IRQ_ENTRY(RTT0),
+ IRQ_ENTRY(RTT1),
+ IRQ_ENTRY(CD_IRQ),
+ IRQ_ENTRY(SRP_TIM),
+ IRQ_ENTRY(APE_REQ),
+ IRQ_ENTRY(USB),
+ IRQ_ENTRY(ABB),
+ IRQ_ENTRY(LOW_POWER_AUDIO),
+ IRQ_ENTRY(TEMP_SENSOR),
+ IRQ_ENTRY(ARM),
+ IRQ_ENTRY(AC_WAKE_ACK),
+ IRQ_ENTRY(MODEM_SW_RESET_REQ),
+ IRQ_ENTRY(GPIO0),
+ IRQ_ENTRY(GPIO1),
+ IRQ_ENTRY(GPIO2),
+ IRQ_ENTRY(GPIO3),
+ IRQ_ENTRY(GPIO4),
+ IRQ_ENTRY(GPIO5),
+ IRQ_ENTRY(GPIO6),
+ IRQ_ENTRY(GPIO7),
+ IRQ_ENTRY(AC_REL_ACK),
+};
+
+#define VALID_WAKEUPS (BIT(NUM_PRCMU_WAKEUP_INDICES) - 1)
+#define WAKEUP_ENTRY(_name)[PRCMU_WAKEUP_INDEX_##_name] = (WAKEUP_BIT_##_name)
+static u32 prcmu_wakeup_bit[NUM_PRCMU_WAKEUP_INDICES] = {
+ WAKEUP_ENTRY(RTC),
+ WAKEUP_ENTRY(RTT0),
+ WAKEUP_ENTRY(RTT1),
+ WAKEUP_ENTRY(CD_IRQ),
+ WAKEUP_ENTRY(USB),
+ WAKEUP_ENTRY(ABB),
+ WAKEUP_ENTRY(ARM)
+};
+
+/*
* mb0_transfer - state needed for mailbox 0 communication.
- * @lock: The transaction lock.
+ * @lock The transaction lock.
+ * @dbb_irqs_lock lock used for (un)masking DBB wakeup interrupts
+ * @mask_work: Work structure used for (un)masking wakeup interrupts.
+ * @req: Request data that need to persist between requests.
*/
static struct {
spinlock_t lock;
+ spinlock_t dbb_irqs_lock;
+ struct work_struct mask_work;
+ struct {
+ u32 dbb_irqs;
+ u32 dbb_wakeups;
+ u32 abb_events;
+ } req;
} mb0_transfer;
+
+/*
+ * mb1_transfer - state needed for mailbox 1 communication.
+ * @lock: The transaction lock.
+ * @work: The transaction completion structure.
+ * @req_arm_opp Requested arm opp
+ * @req_ape_opp Requested ape opp
+ * @ack: Reply ("acknowledge") data.
+ */
+static struct {
+ struct mutex lock;
+ struct completion work;
+ u8 req_arm_opp;
+ u8 req_ape_opp;
+ struct {
+ u8 header;
+ u8 arm_opp;
+ u8 ape_opp;
+ u8 arm_voltage_st;
+ u8 ape_voltage_st;
+ } ack;
+} mb1_transfer;
+
+/*
+ * mb2_transfer - state needed for mailbox 2 communication.
+ * @lock: The transaction lock.
+ * @work: The transaction completion structure.
+ * @req: Request data that need to persist between requests.
+ * @ack: Reply ("acknowledge") data.
+ */
+static struct {
+ struct mutex lock;
+ struct completion work;
+ struct {
+ u8 epod_st[DB5500_NUM_EPOD_ID];
+ u8 pll_st[DB5500_NUM_PLL_ID];
+ } req;
+ struct {
+ u8 header;
+ u8 status;
+ } ack;
+} mb2_transfer;
+
+/*
+ * mb3_transfer - state needed for mailbox 3 communication.
+ * @sysclk_lock: A lock used to handle concurrent sysclk requests.
+ * @sysclk_work: Work structure used for sysclk requests.
+ * @req_st: Requested clock state.
+ * @ack: Acknowledgement data
+ */
+static struct {
+ struct mutex sysclk_lock;
+ struct completion sysclk_work;
+ enum sysclk_state req_st;
+ struct {
+ u8 header;
+ u8 status;
+ } ack;
+} mb3_transfer;
+
/*
* mb5_transfer - state needed for mailbox 5 communication.
* @lock: The transaction lock.
@@ -291,7 +540,7 @@ static void ack_dbb_wakeup(void)
while (readl(PRCM_MBOX_CPU_VAL) & MBOX_BIT(0))
cpu_relax();
- writeb(RMB0H_RD_WAKE_UP_ACK, PRCM_REQ_MB0_HEADER);
+ writeb(MB0H_RD_WAKE_UP_ACK, PRCM_REQ_MB0_HEADER);
writel(MBOX_BIT(0), PRCM_MBOX_CPU_SET);
spin_unlock_irqrestore(&mb0_transfer.lock, flags);
@@ -306,11 +555,25 @@ static inline void print_unknown_header_warning(u8 n, u8 header)
static bool read_mailbox_0(void)
{
bool r;
+ u32 ev;
+ unsigned int n;
+
u8 header;
header = readb(PRCM_ACK_MB0_HEADER);
switch (header) {
- case AMB0H_WAKE_UP:
+ case MB0H_WAKE_UP:
+ if (readb(PRCM_ACK_MB0_READ_POINTER) & 1)
+ ev = readl(PRCM_ACK_MB0_WAKEUP_1_DBB);
+ else
+ ev = readl(PRCM_ACK_MB0_WAKEUP_0_DBB);
+
+ ev &= mb0_transfer.req.dbb_irqs;
+
+ for (n = 0; n < NUM_DB5500_PRCMU_WAKEUPS; n++) {
+ if (ev & prcmu_irq_bit[n])
+ generic_handle_irq(IRQ_DB5500_PRCMU_BASE + n);
+ }
r = true;
break;
default:
@@ -324,19 +587,81 @@ static bool read_mailbox_0(void)
static bool read_mailbox_1(void)
{
+ u8 header;
+ bool do_complete = true;
+
+ header = mb1_transfer.ack.header = readb(PRCM_ACK_MB1_HEADER);
+
+ switch (header) {
+ case MB1H_ARM_OPP:
+ mb1_transfer.ack.arm_opp = readb(PRCM_ACK_MB1_CURRENT_ARM_OPP);
+ mb1_transfer.ack.arm_voltage_st =
+ readb(PRCM_ACK_MB1_ARM_VOLT_STATUS);
+ break;
+ case MB1H_ARM_APE_OPP:
+ mb1_transfer.ack.ape_opp = readb(PRCM_ACK_MB1_CURRENT_APE_OPP);
+ mb1_transfer.ack.ape_voltage_st =
+ readb(PRCM_ACK_MB1_APE_VOLT_STATUS);
+ break;
+ default:
+ print_unknown_header_warning(1, header);
+ do_complete = false;
+ break;
+ }
+
writel(MBOX_BIT(1), PRCM_ARM_IT1_CLR);
+
+ if (do_complete)
+ complete(&mb1_transfer.work);
+
return false;
}
static bool read_mailbox_2(void)
{
+ u8 header;
+
+ header = readb(PRCM_ACK_MB2_HEADER);
+ mb2_transfer.ack.header = header;
+ switch (header) {
+ case MB2H_EPOD_REQUEST:
+ mb2_transfer.ack.status = readb(PRCM_ACK_MB2_EPOD_STATUS);
+ break;
+ case MB2H_CLK_REQUEST:
+ mb2_transfer.ack.status = readb(PRCM_ACK_MB2_CLK_STATUS);
+ break;
+ case MB2H_PLL_REQUEST:
+ mb2_transfer.ack.status = readb(PRCM_ACK_MB2_PLL_STATUS);
+ break;
+ default:
+ writel(MBOX_BIT(2), PRCM_ARM_IT1_CLR);
+ pr_err("prcmu: Wrong ACK received for MB2 request \n");
+ return false;
+ break;
+ }
writel(MBOX_BIT(2), PRCM_ARM_IT1_CLR);
+ complete(&mb2_transfer.work);
return false;
}
static bool read_mailbox_3(void)
{
- writel(MBOX_BIT(3), PRCM_ARM_IT1_CLR);
+ u8 header;
+
+ header = readb(PRCM_ACK_MB3_HEADER);
+ mb3_transfer.ack.header = header;
+ switch (header) {
+ case MB3H_REFCLK_REQUEST:
+ mb3_transfer.ack.status = readb(PRCM_ACK_MB3_REFCLK_REQ);
+ writel(MBOX_BIT(3), PRCM_ARM_IT1_CLR);
+ complete(&mb3_transfer.sysclk_work);
+ break;
+ default:
+ writel(MBOX_BIT(3), PRCM_ARM_IT1_CLR);
+ pr_err("prcmu: wrong MB3 header\n");
+ break;
+ }
+
return false;
}
@@ -421,6 +746,13 @@ void __init db5500_prcmu_early_init(void)
{
tcdm_base = __io_address(U5500_PRCMU_TCDM_BASE);
spin_lock_init(&mb0_transfer.lock);
+ spin_lock_init(&mb0_transfer.dbb_irqs_lock);
+ mutex_init(&mb1_transfer.lock);
+ init_completion(&mb1_transfer.work);
+ mutex_init(&mb2_transfer.lock);
+ init_completion(&mb2_transfer.work);
+ mutex_init(&mb3_transfer.sysclk_lock);
+ init_completion(&mb3_transfer.sysclk_work);
mutex_init(&mb5_transfer.lock);
init_completion(&mb5_transfer.work);
}
--
1.7.3.2
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