diff options
Diffstat (limited to 'drivers/pci/hotplug/ibmphp_hpc.c')
| -rw-r--r-- | drivers/pci/hotplug/ibmphp_hpc.c | 1096 |
1 files changed, 1096 insertions, 0 deletions
diff --git a/drivers/pci/hotplug/ibmphp_hpc.c b/drivers/pci/hotplug/ibmphp_hpc.c new file mode 100644 index 000000000..508a62a6b --- /dev/null +++ b/drivers/pci/hotplug/ibmphp_hpc.c @@ -0,0 +1,1096 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * IBM Hot Plug Controller Driver + * + * Written By: Jyoti Shah, IBM Corporation + * + * Copyright (C) 2001-2003 IBM Corp. + * + * All rights reserved. + * + * Send feedback to <gregkh@us.ibm.com> + * <jshah@us.ibm.com> + * + */ + +#include <linux/wait.h> +#include <linux/time.h> +#include <linux/completion.h> +#include <linux/delay.h> +#include <linux/module.h> +#include <linux/pci.h> +#include <linux/init.h> +#include <linux/mutex.h> +#include <linux/sched.h> +#include <linux/kthread.h> +#include "ibmphp.h" + +static int to_debug = 0; +#define debug_polling(fmt, arg...) do { if (to_debug) debug(fmt, arg); } while (0) + +//---------------------------------------------------------------------------- +// timeout values +//---------------------------------------------------------------------------- +#define CMD_COMPLETE_TOUT_SEC 60 // give HPC 60 sec to finish cmd +#define HPC_CTLR_WORKING_TOUT 60 // give HPC 60 sec to finish cmd +#define HPC_GETACCESS_TIMEOUT 60 // seconds +#define POLL_INTERVAL_SEC 2 // poll HPC every 2 seconds +#define POLL_LATCH_CNT 5 // poll latch 5 times, then poll slots + +//---------------------------------------------------------------------------- +// Winnipeg Architected Register Offsets +//---------------------------------------------------------------------------- +#define WPG_I2CMBUFL_OFFSET 0x08 // I2C Message Buffer Low +#define WPG_I2CMOSUP_OFFSET 0x10 // I2C Master Operation Setup Reg +#define WPG_I2CMCNTL_OFFSET 0x20 // I2C Master Control Register +#define WPG_I2CPARM_OFFSET 0x40 // I2C Parameter Register +#define WPG_I2CSTAT_OFFSET 0x70 // I2C Status Register + +//---------------------------------------------------------------------------- +// Winnipeg Store Type commands (Add this commands to the register offset) +//---------------------------------------------------------------------------- +#define WPG_I2C_AND 0x1000 // I2C AND operation +#define WPG_I2C_OR 0x2000 // I2C OR operation + +//---------------------------------------------------------------------------- +// Command set for I2C Master Operation Setup Register +//---------------------------------------------------------------------------- +#define WPG_READATADDR_MASK 0x00010000 // read,bytes,I2C shifted,index +#define WPG_WRITEATADDR_MASK 0x40010000 // write,bytes,I2C shifted,index +#define WPG_READDIRECT_MASK 0x10010000 +#define WPG_WRITEDIRECT_MASK 0x60010000 + + +//---------------------------------------------------------------------------- +// bit masks for I2C Master Control Register +//---------------------------------------------------------------------------- +#define WPG_I2CMCNTL_STARTOP_MASK 0x00000002 // Start the Operation + +//---------------------------------------------------------------------------- +// +//---------------------------------------------------------------------------- +#define WPG_I2C_IOREMAP_SIZE 0x2044 // size of linear address interval + +//---------------------------------------------------------------------------- +// command index +//---------------------------------------------------------------------------- +#define WPG_1ST_SLOT_INDEX 0x01 // index - 1st slot for ctlr +#define WPG_CTLR_INDEX 0x0F // index - ctlr +#define WPG_1ST_EXTSLOT_INDEX 0x10 // index - 1st ext slot for ctlr +#define WPG_1ST_BUS_INDEX 0x1F // index - 1st bus for ctlr + +//---------------------------------------------------------------------------- +// macro utilities +//---------------------------------------------------------------------------- +// if bits 20,22,25,26,27,29,30 are OFF return 1 +#define HPC_I2CSTATUS_CHECK(s) ((u8)((s & 0x00000A76) ? 0 : 1)) + +//---------------------------------------------------------------------------- +// global variables +//---------------------------------------------------------------------------- +static DEFINE_MUTEX(sem_hpcaccess); // lock access to HPC +static DEFINE_MUTEX(operations_mutex); // lock all operations and + // access to data structures +static DECLARE_COMPLETION(exit_complete); // make sure polling thread goes away +static struct task_struct *ibmphp_poll_thread; +//---------------------------------------------------------------------------- +// local function prototypes +//---------------------------------------------------------------------------- +static u8 i2c_ctrl_read(struct controller *, void __iomem *, u8); +static u8 i2c_ctrl_write(struct controller *, void __iomem *, u8, u8); +static u8 hpc_writecmdtoindex(u8, u8); +static u8 hpc_readcmdtoindex(u8, u8); +static void get_hpc_access(void); +static void free_hpc_access(void); +static int poll_hpc(void *data); +static int process_changeinstatus(struct slot *, struct slot *); +static int process_changeinlatch(u8, u8, struct controller *); +static int hpc_wait_ctlr_notworking(int, struct controller *, void __iomem *, u8 *); +//---------------------------------------------------------------------------- + + +/*---------------------------------------------------------------------- +* Name: i2c_ctrl_read +* +* Action: read from HPC over I2C +* +*---------------------------------------------------------------------*/ +static u8 i2c_ctrl_read(struct controller *ctlr_ptr, void __iomem *WPGBbar, u8 index) +{ + u8 status; + int i; + void __iomem *wpg_addr; // base addr + offset + unsigned long wpg_data; // data to/from WPG LOHI format + unsigned long ultemp; + unsigned long data; // actual data HILO format + + debug_polling("%s - Entry WPGBbar[%p] index[%x] \n", __func__, WPGBbar, index); + + //-------------------------------------------------------------------- + // READ - step 1 + // read at address, byte length, I2C address (shifted), index + // or read direct, byte length, index + if (ctlr_ptr->ctlr_type == 0x02) { + data = WPG_READATADDR_MASK; + // fill in I2C address + ultemp = (unsigned long)ctlr_ptr->u.wpeg_ctlr.i2c_addr; + ultemp = ultemp >> 1; + data |= (ultemp << 8); + + // fill in index + data |= (unsigned long)index; + } else if (ctlr_ptr->ctlr_type == 0x04) { + data = WPG_READDIRECT_MASK; + + // fill in index + ultemp = (unsigned long)index; + ultemp = ultemp << 8; + data |= ultemp; + } else { + err("this controller type is not supported \n"); + return HPC_ERROR; + } + + wpg_data = swab32(data); // swap data before writing + wpg_addr = WPGBbar + WPG_I2CMOSUP_OFFSET; + writel(wpg_data, wpg_addr); + + //-------------------------------------------------------------------- + // READ - step 2 : clear the message buffer + data = 0x00000000; + wpg_data = swab32(data); + wpg_addr = WPGBbar + WPG_I2CMBUFL_OFFSET; + writel(wpg_data, wpg_addr); + + //-------------------------------------------------------------------- + // READ - step 3 : issue start operation, I2C master control bit 30:ON + // 2020 : [20] OR operation at [20] offset 0x20 + data = WPG_I2CMCNTL_STARTOP_MASK; + wpg_data = swab32(data); + wpg_addr = WPGBbar + WPG_I2CMCNTL_OFFSET + WPG_I2C_OR; + writel(wpg_data, wpg_addr); + + //-------------------------------------------------------------------- + // READ - step 4 : wait until start operation bit clears + i = CMD_COMPLETE_TOUT_SEC; + while (i) { + msleep(10); + wpg_addr = WPGBbar + WPG_I2CMCNTL_OFFSET; + wpg_data = readl(wpg_addr); + data = swab32(wpg_data); + if (!(data & WPG_I2CMCNTL_STARTOP_MASK)) + break; + i--; + } + if (i == 0) { + debug("%s - Error : WPG timeout\n", __func__); + return HPC_ERROR; + } + //-------------------------------------------------------------------- + // READ - step 5 : read I2C status register + i = CMD_COMPLETE_TOUT_SEC; + while (i) { + msleep(10); + wpg_addr = WPGBbar + WPG_I2CSTAT_OFFSET; + wpg_data = readl(wpg_addr); + data = swab32(wpg_data); + if (HPC_I2CSTATUS_CHECK(data)) + break; + i--; + } + if (i == 0) { + debug("ctrl_read - Exit Error:I2C timeout\n"); + return HPC_ERROR; + } + + //-------------------------------------------------------------------- + // READ - step 6 : get DATA + wpg_addr = WPGBbar + WPG_I2CMBUFL_OFFSET; + wpg_data = readl(wpg_addr); + data = swab32(wpg_data); + + status = (u8) data; + + debug_polling("%s - Exit index[%x] status[%x]\n", __func__, index, status); + + return (status); +} + +/*---------------------------------------------------------------------- +* Name: i2c_ctrl_write +* +* Action: write to HPC over I2C +* +* Return 0 or error codes +*---------------------------------------------------------------------*/ +static u8 i2c_ctrl_write(struct controller *ctlr_ptr, void __iomem *WPGBbar, u8 index, u8 cmd) +{ + u8 rc; + void __iomem *wpg_addr; // base addr + offset + unsigned long wpg_data; // data to/from WPG LOHI format + unsigned long ultemp; + unsigned long data; // actual data HILO format + int i; + + debug_polling("%s - Entry WPGBbar[%p] index[%x] cmd[%x]\n", __func__, WPGBbar, index, cmd); + + rc = 0; + //-------------------------------------------------------------------- + // WRITE - step 1 + // write at address, byte length, I2C address (shifted), index + // or write direct, byte length, index + data = 0x00000000; + + if (ctlr_ptr->ctlr_type == 0x02) { + data = WPG_WRITEATADDR_MASK; + // fill in I2C address + ultemp = (unsigned long)ctlr_ptr->u.wpeg_ctlr.i2c_addr; + ultemp = ultemp >> 1; + data |= (ultemp << 8); + + // fill in index + data |= (unsigned long)index; + } else if (ctlr_ptr->ctlr_type == 0x04) { + data = WPG_WRITEDIRECT_MASK; + + // fill in index + ultemp = (unsigned long)index; + ultemp = ultemp << 8; + data |= ultemp; + } else { + err("this controller type is not supported \n"); + return HPC_ERROR; + } + + wpg_data = swab32(data); // swap data before writing + wpg_addr = WPGBbar + WPG_I2CMOSUP_OFFSET; + writel(wpg_data, wpg_addr); + + //-------------------------------------------------------------------- + // WRITE - step 2 : clear the message buffer + data = 0x00000000 | (unsigned long)cmd; + wpg_data = swab32(data); + wpg_addr = WPGBbar + WPG_I2CMBUFL_OFFSET; + writel(wpg_data, wpg_addr); + + //-------------------------------------------------------------------- + // WRITE - step 3 : issue start operation,I2C master control bit 30:ON + // 2020 : [20] OR operation at [20] offset 0x20 + data = WPG_I2CMCNTL_STARTOP_MASK; + wpg_data = swab32(data); + wpg_addr = WPGBbar + WPG_I2CMCNTL_OFFSET + WPG_I2C_OR; + writel(wpg_data, wpg_addr); + + //-------------------------------------------------------------------- + // WRITE - step 4 : wait until start operation bit clears + i = CMD_COMPLETE_TOUT_SEC; + while (i) { + msleep(10); + wpg_addr = WPGBbar + WPG_I2CMCNTL_OFFSET; + wpg_data = readl(wpg_addr); + data = swab32(wpg_data); + if (!(data & WPG_I2CMCNTL_STARTOP_MASK)) + break; + i--; + } + if (i == 0) { + debug("%s - Exit Error:WPG timeout\n", __func__); + rc = HPC_ERROR; + } + + //-------------------------------------------------------------------- + // WRITE - step 5 : read I2C status register + i = CMD_COMPLETE_TOUT_SEC; + while (i) { + msleep(10); + wpg_addr = WPGBbar + WPG_I2CSTAT_OFFSET; + wpg_data = readl(wpg_addr); + data = swab32(wpg_data); + if (HPC_I2CSTATUS_CHECK(data)) + break; + i--; + } + if (i == 0) { + debug("ctrl_read - Error : I2C timeout\n"); + rc = HPC_ERROR; + } + + debug_polling("%s Exit rc[%x]\n", __func__, rc); + return (rc); +} + +//------------------------------------------------------------ +// Read from ISA type HPC +//------------------------------------------------------------ +static u8 isa_ctrl_read(struct controller *ctlr_ptr, u8 offset) +{ + u16 start_address; + u16 end_address; + u8 data; + + start_address = ctlr_ptr->u.isa_ctlr.io_start; + end_address = ctlr_ptr->u.isa_ctlr.io_end; + data = inb(start_address + offset); + return data; +} + +//-------------------------------------------------------------- +// Write to ISA type HPC +//-------------------------------------------------------------- +static void isa_ctrl_write(struct controller *ctlr_ptr, u8 offset, u8 data) +{ + u16 start_address; + u16 port_address; + + start_address = ctlr_ptr->u.isa_ctlr.io_start; + port_address = start_address + (u16) offset; + outb(data, port_address); +} + +static u8 pci_ctrl_read(struct controller *ctrl, u8 offset) +{ + u8 data = 0x00; + debug("inside pci_ctrl_read\n"); + if (ctrl->ctrl_dev) + pci_read_config_byte(ctrl->ctrl_dev, HPC_PCI_OFFSET + offset, &data); + return data; +} + +static u8 pci_ctrl_write(struct controller *ctrl, u8 offset, u8 data) +{ + u8 rc = -ENODEV; + debug("inside pci_ctrl_write\n"); + if (ctrl->ctrl_dev) { + pci_write_config_byte(ctrl->ctrl_dev, HPC_PCI_OFFSET + offset, data); + rc = 0; + } + return rc; +} + +static u8 ctrl_read(struct controller *ctlr, void __iomem *base, u8 offset) +{ + u8 rc; + switch (ctlr->ctlr_type) { + case 0: + rc = isa_ctrl_read(ctlr, offset); + break; + case 1: + rc = pci_ctrl_read(ctlr, offset); + break; + case 2: + case 4: + rc = i2c_ctrl_read(ctlr, base, offset); + break; + default: + return -ENODEV; + } + return rc; +} + +static u8 ctrl_write(struct controller *ctlr, void __iomem *base, u8 offset, u8 data) +{ + u8 rc = 0; + switch (ctlr->ctlr_type) { + case 0: + isa_ctrl_write(ctlr, offset, data); + break; + case 1: + rc = pci_ctrl_write(ctlr, offset, data); + break; + case 2: + case 4: + rc = i2c_ctrl_write(ctlr, base, offset, data); + break; + default: + return -ENODEV; + } + return rc; +} +/*---------------------------------------------------------------------- +* Name: hpc_writecmdtoindex() +* +* Action: convert a write command to proper index within a controller +* +* Return index, HPC_ERROR +*---------------------------------------------------------------------*/ +static u8 hpc_writecmdtoindex(u8 cmd, u8 index) +{ + u8 rc; + + switch (cmd) { + case HPC_CTLR_ENABLEIRQ: // 0x00.N.15 + case HPC_CTLR_CLEARIRQ: // 0x06.N.15 + case HPC_CTLR_RESET: // 0x07.N.15 + case HPC_CTLR_IRQSTEER: // 0x08.N.15 + case HPC_CTLR_DISABLEIRQ: // 0x01.N.15 + case HPC_ALLSLOT_ON: // 0x11.N.15 + case HPC_ALLSLOT_OFF: // 0x12.N.15 + rc = 0x0F; + break; + + case HPC_SLOT_OFF: // 0x02.Y.0-14 + case HPC_SLOT_ON: // 0x03.Y.0-14 + case HPC_SLOT_ATTNOFF: // 0x04.N.0-14 + case HPC_SLOT_ATTNON: // 0x05.N.0-14 + case HPC_SLOT_BLINKLED: // 0x13.N.0-14 + rc = index; + break; + + case HPC_BUS_33CONVMODE: + case HPC_BUS_66CONVMODE: + case HPC_BUS_66PCIXMODE: + case HPC_BUS_100PCIXMODE: + case HPC_BUS_133PCIXMODE: + rc = index + WPG_1ST_BUS_INDEX - 1; + break; + + default: + err("hpc_writecmdtoindex - Error invalid cmd[%x]\n", cmd); + rc = HPC_ERROR; + } + + return rc; +} + +/*---------------------------------------------------------------------- +* Name: hpc_readcmdtoindex() +* +* Action: convert a read command to proper index within a controller +* +* Return index, HPC_ERROR +*---------------------------------------------------------------------*/ +static u8 hpc_readcmdtoindex(u8 cmd, u8 index) +{ + u8 rc; + + switch (cmd) { + case READ_CTLRSTATUS: + rc = 0x0F; + break; + case READ_SLOTSTATUS: + case READ_ALLSTAT: + rc = index; + break; + case READ_EXTSLOTSTATUS: + rc = index + WPG_1ST_EXTSLOT_INDEX; + break; + case READ_BUSSTATUS: + rc = index + WPG_1ST_BUS_INDEX - 1; + break; + case READ_SLOTLATCHLOWREG: + rc = 0x28; + break; + case READ_REVLEVEL: + rc = 0x25; + break; + case READ_HPCOPTIONS: + rc = 0x27; + break; + default: + rc = HPC_ERROR; + } + return rc; +} + +/*---------------------------------------------------------------------- +* Name: HPCreadslot() +* +* Action: issue a READ command to HPC +* +* Input: pslot - cannot be NULL for READ_ALLSTAT +* pstatus - can be NULL for READ_ALLSTAT +* +* Return 0 or error codes +*---------------------------------------------------------------------*/ +int ibmphp_hpc_readslot(struct slot *pslot, u8 cmd, u8 *pstatus) +{ + void __iomem *wpg_bbar = NULL; + struct controller *ctlr_ptr; + u8 index, status; + int rc = 0; + int busindex; + + debug_polling("%s - Entry pslot[%p] cmd[%x] pstatus[%p]\n", __func__, pslot, cmd, pstatus); + + if ((pslot == NULL) + || ((pstatus == NULL) && (cmd != READ_ALLSTAT) && (cmd != READ_BUSSTATUS))) { + rc = -EINVAL; + err("%s - Error invalid pointer, rc[%d]\n", __func__, rc); + return rc; + } + + if (cmd == READ_BUSSTATUS) { + busindex = ibmphp_get_bus_index(pslot->bus); + if (busindex < 0) { + rc = -EINVAL; + err("%s - Exit Error:invalid bus, rc[%d]\n", __func__, rc); + return rc; + } else + index = (u8) busindex; + } else + index = pslot->ctlr_index; + + index = hpc_readcmdtoindex(cmd, index); + + if (index == HPC_ERROR) { + rc = -EINVAL; + err("%s - Exit Error:invalid index, rc[%d]\n", __func__, rc); + return rc; + } + + ctlr_ptr = pslot->ctrl; + + get_hpc_access(); + + //-------------------------------------------------------------------- + // map physical address to logical address + //-------------------------------------------------------------------- + if ((ctlr_ptr->ctlr_type == 2) || (ctlr_ptr->ctlr_type == 4)) + wpg_bbar = ioremap(ctlr_ptr->u.wpeg_ctlr.wpegbbar, WPG_I2C_IOREMAP_SIZE); + + //-------------------------------------------------------------------- + // check controller status before reading + //-------------------------------------------------------------------- + rc = hpc_wait_ctlr_notworking(HPC_CTLR_WORKING_TOUT, ctlr_ptr, wpg_bbar, &status); + if (!rc) { + switch (cmd) { + case READ_ALLSTAT: + // update the slot structure + pslot->ctrl->status = status; + pslot->status = ctrl_read(ctlr_ptr, wpg_bbar, index); + rc = hpc_wait_ctlr_notworking(HPC_CTLR_WORKING_TOUT, ctlr_ptr, wpg_bbar, + &status); + if (!rc) + pslot->ext_status = ctrl_read(ctlr_ptr, wpg_bbar, index + WPG_1ST_EXTSLOT_INDEX); + + break; + + case READ_SLOTSTATUS: + // DO NOT update the slot structure + *pstatus = ctrl_read(ctlr_ptr, wpg_bbar, index); + break; + + case READ_EXTSLOTSTATUS: + // DO NOT update the slot structure + *pstatus = ctrl_read(ctlr_ptr, wpg_bbar, index); + break; + + case READ_CTLRSTATUS: + // DO NOT update the slot structure + *pstatus = status; + break; + + case READ_BUSSTATUS: + pslot->busstatus = ctrl_read(ctlr_ptr, wpg_bbar, index); + break; + case READ_REVLEVEL: + *pstatus = ctrl_read(ctlr_ptr, wpg_bbar, index); + break; + case READ_HPCOPTIONS: + *pstatus = ctrl_read(ctlr_ptr, wpg_bbar, index); + break; + case READ_SLOTLATCHLOWREG: + // DO NOT update the slot structure + *pstatus = ctrl_read(ctlr_ptr, wpg_bbar, index); + break; + + // Not used + case READ_ALLSLOT: + list_for_each_entry(pslot, &ibmphp_slot_head, + ibm_slot_list) { + index = pslot->ctlr_index; + rc = hpc_wait_ctlr_notworking(HPC_CTLR_WORKING_TOUT, ctlr_ptr, + wpg_bbar, &status); + if (!rc) { + pslot->status = ctrl_read(ctlr_ptr, wpg_bbar, index); + rc = hpc_wait_ctlr_notworking(HPC_CTLR_WORKING_TOUT, + ctlr_ptr, wpg_bbar, &status); + if (!rc) + pslot->ext_status = + ctrl_read(ctlr_ptr, wpg_bbar, + index + WPG_1ST_EXTSLOT_INDEX); + } else { + err("%s - Error ctrl_read failed\n", __func__); + rc = -EINVAL; + break; + } + } + break; + default: + rc = -EINVAL; + break; + } + } + //-------------------------------------------------------------------- + // cleanup + //-------------------------------------------------------------------- + + // remove physical to logical address mapping + if ((ctlr_ptr->ctlr_type == 2) || (ctlr_ptr->ctlr_type == 4)) + iounmap(wpg_bbar); + + free_hpc_access(); + + debug_polling("%s - Exit rc[%d]\n", __func__, rc); + return rc; +} + +/*---------------------------------------------------------------------- +* Name: ibmphp_hpc_writeslot() +* +* Action: issue a WRITE command to HPC +*---------------------------------------------------------------------*/ +int ibmphp_hpc_writeslot(struct slot *pslot, u8 cmd) +{ + void __iomem *wpg_bbar = NULL; + struct controller *ctlr_ptr; + u8 index, status; + int busindex; + u8 done; + int rc = 0; + int timeout; + + debug_polling("%s - Entry pslot[%p] cmd[%x]\n", __func__, pslot, cmd); + if (pslot == NULL) { + rc = -EINVAL; + err("%s - Error Exit rc[%d]\n", __func__, rc); + return rc; + } + + if ((cmd == HPC_BUS_33CONVMODE) || (cmd == HPC_BUS_66CONVMODE) || + (cmd == HPC_BUS_66PCIXMODE) || (cmd == HPC_BUS_100PCIXMODE) || + (cmd == HPC_BUS_133PCIXMODE)) { + busindex = ibmphp_get_bus_index(pslot->bus); + if (busindex < 0) { + rc = -EINVAL; + err("%s - Exit Error:invalid bus, rc[%d]\n", __func__, rc); + return rc; + } else + index = (u8) busindex; + } else + index = pslot->ctlr_index; + + index = hpc_writecmdtoindex(cmd, index); + + if (index == HPC_ERROR) { + rc = -EINVAL; + err("%s - Error Exit rc[%d]\n", __func__, rc); + return rc; + } + + ctlr_ptr = pslot->ctrl; + + get_hpc_access(); + + //-------------------------------------------------------------------- + // map physical address to logical address + //-------------------------------------------------------------------- + if ((ctlr_ptr->ctlr_type == 2) || (ctlr_ptr->ctlr_type == 4)) { + wpg_bbar = ioremap(ctlr_ptr->u.wpeg_ctlr.wpegbbar, WPG_I2C_IOREMAP_SIZE); + + debug("%s - ctlr id[%x] physical[%lx] logical[%lx] i2c[%x]\n", __func__, + ctlr_ptr->ctlr_id, (ulong) (ctlr_ptr->u.wpeg_ctlr.wpegbbar), (ulong) wpg_bbar, + ctlr_ptr->u.wpeg_ctlr.i2c_addr); + } + //-------------------------------------------------------------------- + // check controller status before writing + //-------------------------------------------------------------------- + rc = hpc_wait_ctlr_notworking(HPC_CTLR_WORKING_TOUT, ctlr_ptr, wpg_bbar, &status); + if (!rc) { + + ctrl_write(ctlr_ptr, wpg_bbar, index, cmd); + + //-------------------------------------------------------------------- + // check controller is still not working on the command + //-------------------------------------------------------------------- + timeout = CMD_COMPLETE_TOUT_SEC; + done = 0; + while (!done) { + rc = hpc_wait_ctlr_notworking(HPC_CTLR_WORKING_TOUT, ctlr_ptr, wpg_bbar, + &status); + if (!rc) { + if (NEEDTOCHECK_CMDSTATUS(cmd)) { + if (CTLR_FINISHED(status) == HPC_CTLR_FINISHED_YES) + done = 1; + } else + done = 1; + } + if (!done) { + msleep(1000); + if (timeout < 1) { + done = 1; + err("%s - Error command complete timeout\n", __func__); + rc = -EFAULT; + } else + timeout--; + } + } + ctlr_ptr->status = status; + } + // cleanup + + // remove physical to logical address mapping + if ((ctlr_ptr->ctlr_type == 2) || (ctlr_ptr->ctlr_type == 4)) + iounmap(wpg_bbar); + free_hpc_access(); + + debug_polling("%s - Exit rc[%d]\n", __func__, rc); + return rc; +} + +/*---------------------------------------------------------------------- +* Name: get_hpc_access() +* +* Action: make sure only one process can access HPC at one time +*---------------------------------------------------------------------*/ +static void get_hpc_access(void) +{ + mutex_lock(&sem_hpcaccess); +} + +/*---------------------------------------------------------------------- +* Name: free_hpc_access() +*---------------------------------------------------------------------*/ +void free_hpc_access(void) +{ + mutex_unlock(&sem_hpcaccess); +} + +/*---------------------------------------------------------------------- +* Name: ibmphp_lock_operations() +* +* Action: make sure only one process can change the data structure +*---------------------------------------------------------------------*/ +void ibmphp_lock_operations(void) +{ + mutex_lock(&operations_mutex); + to_debug = 1; +} + +/*---------------------------------------------------------------------- +* Name: ibmphp_unlock_operations() +*---------------------------------------------------------------------*/ +void ibmphp_unlock_operations(void) +{ + debug("%s - Entry\n", __func__); + mutex_unlock(&operations_mutex); + to_debug = 0; + debug("%s - Exit\n", __func__); +} + +/*---------------------------------------------------------------------- +* Name: poll_hpc() +*---------------------------------------------------------------------*/ +#define POLL_LATCH_REGISTER 0 +#define POLL_SLOTS 1 +#define POLL_SLEEP 2 +static int poll_hpc(void *data) +{ + struct slot myslot; + struct slot *pslot = NULL; + int rc; + int poll_state = POLL_LATCH_REGISTER; + u8 oldlatchlow = 0x00; + u8 curlatchlow = 0x00; + int poll_count = 0; + u8 ctrl_count = 0x00; + + debug("%s - Entry\n", __func__); + + while (!kthread_should_stop()) { + /* try to get the lock to do some kind of hardware access */ + mutex_lock(&operations_mutex); + + switch (poll_state) { + case POLL_LATCH_REGISTER: + oldlatchlow = curlatchlow; + ctrl_count = 0x00; + list_for_each_entry(pslot, &ibmphp_slot_head, + ibm_slot_list) { + if (ctrl_count >= ibmphp_get_total_controllers()) + break; + if (pslot->ctrl->ctlr_relative_id == ctrl_count) { + ctrl_count++; + if (READ_SLOT_LATCH(pslot->ctrl)) { + rc = ibmphp_hpc_readslot(pslot, + READ_SLOTLATCHLOWREG, + &curlatchlow); + if (oldlatchlow != curlatchlow) + process_changeinlatch(oldlatchlow, + curlatchlow, + pslot->ctrl); + } + } + } + ++poll_count; + poll_state = POLL_SLEEP; + break; + case POLL_SLOTS: + list_for_each_entry(pslot, &ibmphp_slot_head, + ibm_slot_list) { + // make a copy of the old status + memcpy((void *) &myslot, (void *) pslot, + sizeof(struct slot)); + rc = ibmphp_hpc_readslot(pslot, READ_ALLSTAT, NULL); + if ((myslot.status != pslot->status) + || (myslot.ext_status != pslot->ext_status)) + process_changeinstatus(pslot, &myslot); + } + ctrl_count = 0x00; + list_for_each_entry(pslot, &ibmphp_slot_head, + ibm_slot_list) { + if (ctrl_count >= ibmphp_get_total_controllers()) + break; + if (pslot->ctrl->ctlr_relative_id == ctrl_count) { + ctrl_count++; + if (READ_SLOT_LATCH(pslot->ctrl)) + rc = ibmphp_hpc_readslot(pslot, + READ_SLOTLATCHLOWREG, + &curlatchlow); + } + } + ++poll_count; + poll_state = POLL_SLEEP; + break; + case POLL_SLEEP: + /* don't sleep with a lock on the hardware */ + mutex_unlock(&operations_mutex); + msleep(POLL_INTERVAL_SEC * 1000); + + if (kthread_should_stop()) + goto out_sleep; + + mutex_lock(&operations_mutex); + + if (poll_count >= POLL_LATCH_CNT) { + poll_count = 0; + poll_state = POLL_SLOTS; + } else + poll_state = POLL_LATCH_REGISTER; + break; + } + /* give up the hardware semaphore */ + mutex_unlock(&operations_mutex); + /* sleep for a short time just for good measure */ +out_sleep: + msleep(100); + } + complete(&exit_complete); + debug("%s - Exit\n", __func__); + return 0; +} + + +/*---------------------------------------------------------------------- +* Name: process_changeinstatus +* +* Action: compare old and new slot status, process the change in status +* +* Input: pointer to slot struct, old slot struct +* +* Return 0 or error codes +* Value: +* +* Side +* Effects: None. +* +* Notes: +*---------------------------------------------------------------------*/ +static int process_changeinstatus(struct slot *pslot, struct slot *poldslot) +{ + u8 status; + int rc = 0; + u8 disable = 0; + u8 update = 0; + + debug("process_changeinstatus - Entry pslot[%p], poldslot[%p]\n", pslot, poldslot); + + // bit 0 - HPC_SLOT_POWER + if ((pslot->status & 0x01) != (poldslot->status & 0x01)) + update = 1; + + // bit 1 - HPC_SLOT_CONNECT + // ignore + + // bit 2 - HPC_SLOT_ATTN + if ((pslot->status & 0x04) != (poldslot->status & 0x04)) + update = 1; + + // bit 3 - HPC_SLOT_PRSNT2 + // bit 4 - HPC_SLOT_PRSNT1 + if (((pslot->status & 0x08) != (poldslot->status & 0x08)) + || ((pslot->status & 0x10) != (poldslot->status & 0x10))) + update = 1; + + // bit 5 - HPC_SLOT_PWRGD + if ((pslot->status & 0x20) != (poldslot->status & 0x20)) + // OFF -> ON: ignore, ON -> OFF: disable slot + if ((poldslot->status & 0x20) && (SLOT_CONNECT(poldslot->status) == HPC_SLOT_CONNECTED) && (SLOT_PRESENT(poldslot->status))) + disable = 1; + + // bit 6 - HPC_SLOT_BUS_SPEED + // ignore + + // bit 7 - HPC_SLOT_LATCH + if ((pslot->status & 0x80) != (poldslot->status & 0x80)) { + update = 1; + // OPEN -> CLOSE + if (pslot->status & 0x80) { + if (SLOT_PWRGD(pslot->status)) { + // power goes on and off after closing latch + // check again to make sure power is still ON + msleep(1000); + rc = ibmphp_hpc_readslot(pslot, READ_SLOTSTATUS, &status); + if (SLOT_PWRGD(status)) + update = 1; + else // overwrite power in pslot to OFF + pslot->status &= ~HPC_SLOT_POWER; + } + } + // CLOSE -> OPEN + else if ((SLOT_PWRGD(poldslot->status) == HPC_SLOT_PWRGD_GOOD) + && (SLOT_CONNECT(poldslot->status) == HPC_SLOT_CONNECTED) && (SLOT_PRESENT(poldslot->status))) { + disable = 1; + } + // else - ignore + } + // bit 4 - HPC_SLOT_BLINK_ATTN + if ((pslot->ext_status & 0x08) != (poldslot->ext_status & 0x08)) + update = 1; + + if (disable) { + debug("process_changeinstatus - disable slot\n"); + pslot->flag = 0; + rc = ibmphp_do_disable_slot(pslot); + } + + if (update || disable) + ibmphp_update_slot_info(pslot); + + debug("%s - Exit rc[%d] disable[%x] update[%x]\n", __func__, rc, disable, update); + + return rc; +} + +/*---------------------------------------------------------------------- +* Name: process_changeinlatch +* +* Action: compare old and new latch reg status, process the change +* +* Input: old and current latch register status +* +* Return 0 or error codes +* Value: +*---------------------------------------------------------------------*/ +static int process_changeinlatch(u8 old, u8 new, struct controller *ctrl) +{ + struct slot myslot, *pslot; + u8 i; + u8 mask; + int rc = 0; + + debug("%s - Entry old[%x], new[%x]\n", __func__, old, new); + // bit 0 reserved, 0 is LSB, check bit 1-6 for 6 slots + + for (i = ctrl->starting_slot_num; i <= ctrl->ending_slot_num; i++) { + mask = 0x01 << i; + if ((mask & old) != (mask & new)) { + pslot = ibmphp_get_slot_from_physical_num(i); + if (pslot) { + memcpy((void *) &myslot, (void *) pslot, sizeof(struct slot)); + rc = ibmphp_hpc_readslot(pslot, READ_ALLSTAT, NULL); + debug("%s - call process_changeinstatus for slot[%d]\n", __func__, i); + process_changeinstatus(pslot, &myslot); + } else { + rc = -EINVAL; + err("%s - Error bad pointer for slot[%d]\n", __func__, i); + } + } + } + debug("%s - Exit rc[%d]\n", __func__, rc); + return rc; +} + +/*---------------------------------------------------------------------- +* Name: ibmphp_hpc_start_poll_thread +* +* Action: start polling thread +*---------------------------------------------------------------------*/ +int __init ibmphp_hpc_start_poll_thread(void) +{ + debug("%s - Entry\n", __func__); + + ibmphp_poll_thread = kthread_run(poll_hpc, NULL, "hpc_poll"); + if (IS_ERR(ibmphp_poll_thread)) { + err("%s - Error, thread not started\n", __func__); + return PTR_ERR(ibmphp_poll_thread); + } + return 0; +} + +/*---------------------------------------------------------------------- +* Name: ibmphp_hpc_stop_poll_thread +* +* Action: stop polling thread and cleanup +*---------------------------------------------------------------------*/ +void __exit ibmphp_hpc_stop_poll_thread(void) +{ + debug("%s - Entry\n", __func__); + + kthread_stop(ibmphp_poll_thread); + debug("before locking operations\n"); + ibmphp_lock_operations(); + debug("after locking operations\n"); + + // wait for poll thread to exit + debug("before exit_complete down\n"); + wait_for_completion(&exit_complete); + debug("after exit_completion down\n"); + + // cleanup + debug("before free_hpc_access\n"); + free_hpc_access(); + debug("after free_hpc_access\n"); + ibmphp_unlock_operations(); + debug("after unlock operations\n"); + + debug("%s - Exit\n", __func__); +} + +/*---------------------------------------------------------------------- +* Name: hpc_wait_ctlr_notworking +* +* Action: wait until the controller is in a not working state +* +* Return 0, HPC_ERROR +* Value: +*---------------------------------------------------------------------*/ +static int hpc_wait_ctlr_notworking(int timeout, struct controller *ctlr_ptr, void __iomem *wpg_bbar, + u8 *pstatus) +{ + int rc = 0; + u8 done = 0; + + debug_polling("hpc_wait_ctlr_notworking - Entry timeout[%d]\n", timeout); + + while (!done) { + *pstatus = ctrl_read(ctlr_ptr, wpg_bbar, WPG_CTLR_INDEX); + if (*pstatus == HPC_ERROR) { + rc = HPC_ERROR; + done = 1; + } + if (CTLR_WORKING(*pstatus) == HPC_CTLR_WORKING_NO) + done = 1; + if (!done) { + msleep(1000); + if (timeout < 1) { + done = 1; + err("HPCreadslot - Error ctlr timeout\n"); + rc = HPC_ERROR; + } else + timeout--; + } + } + debug_polling("hpc_wait_ctlr_notworking - Exit rc[%x] status[%x]\n", rc, *pstatus); + return rc; +} |