![Grant Likely](/assets/img/avatar_default.png)
This patch adds documentation to the mpc5200 interrupt controller driver and cleans up some minor coding conventions. It also moves the contents of mpc52xx_pic.h into the driver proper (except for a small common bit that is moved to the common mpc52xx.h) because the information encoded there is not required by any other part of kernel code. Finally for code readability sake, the L2_OFFSET shift value is removed because the code using it resolves to a noop. Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
252 lines
6.2 KiB
C
252 lines
6.2 KiB
C
#include <linux/init.h>
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#include <linux/suspend.h>
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#include <asm/io.h>
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#include <asm/time.h>
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#include <asm/mpc52xx.h>
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/* defined in lite5200_sleep.S and only used here */
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extern void lite5200_low_power(void __iomem *sram, void __iomem *mbar);
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static struct mpc52xx_cdm __iomem *cdm;
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static struct mpc52xx_intr __iomem *pic;
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static struct mpc52xx_sdma __iomem *bes;
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static struct mpc52xx_xlb __iomem *xlb;
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static struct mpc52xx_gpio __iomem *gps;
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static struct mpc52xx_gpio_wkup __iomem *gpw;
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static void __iomem *pci;
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static void __iomem *sram;
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static const int sram_size = 0x4000; /* 16 kBytes */
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static void __iomem *mbar;
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static suspend_state_t lite5200_pm_target_state;
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static int lite5200_pm_valid(suspend_state_t state)
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{
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switch (state) {
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case PM_SUSPEND_STANDBY:
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case PM_SUSPEND_MEM:
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return 1;
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default:
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return 0;
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}
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}
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static int lite5200_pm_begin(suspend_state_t state)
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{
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if (lite5200_pm_valid(state)) {
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lite5200_pm_target_state = state;
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return 0;
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}
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return -EINVAL;
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}
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static int lite5200_pm_prepare(void)
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{
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struct device_node *np;
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const struct of_device_id immr_ids[] = {
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{ .compatible = "fsl,mpc5200-immr", },
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{ .compatible = "fsl,mpc5200b-immr", },
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{ .type = "soc", .compatible = "mpc5200", }, /* lite5200 */
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{ .type = "builtin", .compatible = "mpc5200", }, /* efika */
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{}
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};
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u64 regaddr64 = 0;
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const u32 *regaddr_p;
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/* deep sleep? let mpc52xx code handle that */
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if (lite5200_pm_target_state == PM_SUSPEND_STANDBY)
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return mpc52xx_pm_prepare();
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if (lite5200_pm_target_state != PM_SUSPEND_MEM)
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return -EINVAL;
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/* map registers */
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np = of_find_matching_node(NULL, immr_ids);
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regaddr_p = of_get_address(np, 0, NULL, NULL);
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if (regaddr_p)
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regaddr64 = of_translate_address(np, regaddr_p);
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of_node_put(np);
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mbar = ioremap((u32) regaddr64, 0xC000);
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if (!mbar) {
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printk(KERN_ERR "%s:%i Error mapping registers\n", __func__, __LINE__);
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return -ENOSYS;
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}
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cdm = mbar + 0x200;
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pic = mbar + 0x500;
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gps = mbar + 0xb00;
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gpw = mbar + 0xc00;
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pci = mbar + 0xd00;
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bes = mbar + 0x1200;
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xlb = mbar + 0x1f00;
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sram = mbar + 0x8000;
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return 0;
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}
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/* save and restore registers not bound to any real devices */
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static struct mpc52xx_cdm scdm;
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static struct mpc52xx_intr spic;
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static struct mpc52xx_sdma sbes;
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static struct mpc52xx_xlb sxlb;
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static struct mpc52xx_gpio sgps;
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static struct mpc52xx_gpio_wkup sgpw;
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static char spci[0x200];
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static void lite5200_save_regs(void)
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{
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_memcpy_fromio(&spic, pic, sizeof(*pic));
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_memcpy_fromio(&sbes, bes, sizeof(*bes));
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_memcpy_fromio(&scdm, cdm, sizeof(*cdm));
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_memcpy_fromio(&sxlb, xlb, sizeof(*xlb));
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_memcpy_fromio(&sgps, gps, sizeof(*gps));
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_memcpy_fromio(&sgpw, gpw, sizeof(*gpw));
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_memcpy_fromio(spci, pci, 0x200);
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_memcpy_fromio(saved_sram, sram, sram_size);
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}
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static void lite5200_restore_regs(void)
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{
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int i;
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_memcpy_toio(sram, saved_sram, sram_size);
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/* PCI Configuration */
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_memcpy_toio(pci, spci, 0x200);
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/*
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* GPIOs. Interrupt Master Enable has higher address then other
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* registers, so just memcpy is ok.
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*/
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_memcpy_toio(gpw, &sgpw, sizeof(*gpw));
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_memcpy_toio(gps, &sgps, sizeof(*gps));
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/* XLB Arbitrer */
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out_be32(&xlb->snoop_window, sxlb.snoop_window);
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out_be32(&xlb->master_priority, sxlb.master_priority);
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out_be32(&xlb->master_pri_enable, sxlb.master_pri_enable);
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/* enable */
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out_be32(&xlb->int_enable, sxlb.int_enable);
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out_be32(&xlb->config, sxlb.config);
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/* CDM - Clock Distribution Module */
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out_8(&cdm->ipb_clk_sel, scdm.ipb_clk_sel);
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out_8(&cdm->pci_clk_sel, scdm.pci_clk_sel);
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out_8(&cdm->ext_48mhz_en, scdm.ext_48mhz_en);
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out_8(&cdm->fd_enable, scdm.fd_enable);
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out_be16(&cdm->fd_counters, scdm.fd_counters);
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out_be32(&cdm->clk_enables, scdm.clk_enables);
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out_8(&cdm->osc_disable, scdm.osc_disable);
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out_be16(&cdm->mclken_div_psc1, scdm.mclken_div_psc1);
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out_be16(&cdm->mclken_div_psc2, scdm.mclken_div_psc2);
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out_be16(&cdm->mclken_div_psc3, scdm.mclken_div_psc3);
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out_be16(&cdm->mclken_div_psc6, scdm.mclken_div_psc6);
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/* BESTCOMM */
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out_be32(&bes->taskBar, sbes.taskBar);
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out_be32(&bes->currentPointer, sbes.currentPointer);
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out_be32(&bes->endPointer, sbes.endPointer);
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out_be32(&bes->variablePointer, sbes.variablePointer);
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out_8(&bes->IntVect1, sbes.IntVect1);
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out_8(&bes->IntVect2, sbes.IntVect2);
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out_be16(&bes->PtdCntrl, sbes.PtdCntrl);
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for (i=0; i<32; i++)
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out_8(&bes->ipr[i], sbes.ipr[i]);
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out_be32(&bes->cReqSelect, sbes.cReqSelect);
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out_be32(&bes->task_size0, sbes.task_size0);
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out_be32(&bes->task_size1, sbes.task_size1);
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out_be32(&bes->MDEDebug, sbes.MDEDebug);
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out_be32(&bes->ADSDebug, sbes.ADSDebug);
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out_be32(&bes->Value1, sbes.Value1);
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out_be32(&bes->Value2, sbes.Value2);
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out_be32(&bes->Control, sbes.Control);
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out_be32(&bes->Status, sbes.Status);
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out_be32(&bes->PTDDebug, sbes.PTDDebug);
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/* restore tasks */
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for (i=0; i<16; i++)
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out_be16(&bes->tcr[i], sbes.tcr[i]);
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/* enable interrupts */
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out_be32(&bes->IntPend, sbes.IntPend);
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out_be32(&bes->IntMask, sbes.IntMask);
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/* PIC */
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out_be32(&pic->per_pri1, spic.per_pri1);
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out_be32(&pic->per_pri2, spic.per_pri2);
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out_be32(&pic->per_pri3, spic.per_pri3);
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out_be32(&pic->main_pri1, spic.main_pri1);
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out_be32(&pic->main_pri2, spic.main_pri2);
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out_be32(&pic->enc_status, spic.enc_status);
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/* unmask and enable interrupts */
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out_be32(&pic->per_mask, spic.per_mask);
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out_be32(&pic->main_mask, spic.main_mask);
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out_be32(&pic->ctrl, spic.ctrl);
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}
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static int lite5200_pm_enter(suspend_state_t state)
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{
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/* deep sleep? let mpc52xx code handle that */
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if (state == PM_SUSPEND_STANDBY) {
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return mpc52xx_pm_enter(state);
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}
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lite5200_save_regs();
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/* effectively save FP regs */
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enable_kernel_fp();
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lite5200_low_power(sram, mbar);
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lite5200_restore_regs();
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/* restart jiffies */
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wakeup_decrementer();
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iounmap(mbar);
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return 0;
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}
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static void lite5200_pm_finish(void)
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{
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/* deep sleep? let mpc52xx code handle that */
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if (lite5200_pm_target_state == PM_SUSPEND_STANDBY)
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mpc52xx_pm_finish();
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}
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static void lite5200_pm_end(void)
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{
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lite5200_pm_target_state = PM_SUSPEND_ON;
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}
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static struct platform_suspend_ops lite5200_pm_ops = {
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.valid = lite5200_pm_valid,
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.begin = lite5200_pm_begin,
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.prepare = lite5200_pm_prepare,
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.enter = lite5200_pm_enter,
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.finish = lite5200_pm_finish,
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.end = lite5200_pm_end,
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};
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int __init lite5200_pm_init(void)
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{
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suspend_set_ops(&lite5200_pm_ops);
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return 0;
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}
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