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- // SPDX-License-Identifier: GPL-2.0-only
- /*
- * linux/arch/arm/common/sa1111.c
- *
- * SA1111 support
- *
- * Original code by John Dorsey
- *
- * This file contains all generic SA1111 support.
- *
- * All initialization functions provided here are intended to be called
- * from machine specific code with proper arguments when required.
- */
- #include <linux/module.h>
- #include <linux/gpio/driver.h>
- #include <linux/init.h>
- #include <linux/irq.h>
- #include <linux/kernel.h>
- #include <linux/delay.h>
- #include <linux/errno.h>
- #include <linux/ioport.h>
- #include <linux/platform_device.h>
- #include <linux/slab.h>
- #include <linux/spinlock.h>
- #include <linux/dma-map-ops.h>
- #include <linux/clk.h>
- #include <linux/io.h>
- #include <asm/mach/irq.h>
- #include <asm/mach-types.h>
- #include <linux/sizes.h>
- #include <asm/hardware/sa1111.h>
- #ifdef CONFIG_ARCH_SA1100
- #include <mach/hardware.h>
- #endif
- /* SA1111 IRQs */
- #define IRQ_GPAIN0 (0)
- #define IRQ_GPAIN1 (1)
- #define IRQ_GPAIN2 (2)
- #define IRQ_GPAIN3 (3)
- #define IRQ_GPBIN0 (4)
- #define IRQ_GPBIN1 (5)
- #define IRQ_GPBIN2 (6)
- #define IRQ_GPBIN3 (7)
- #define IRQ_GPBIN4 (8)
- #define IRQ_GPBIN5 (9)
- #define IRQ_GPCIN0 (10)
- #define IRQ_GPCIN1 (11)
- #define IRQ_GPCIN2 (12)
- #define IRQ_GPCIN3 (13)
- #define IRQ_GPCIN4 (14)
- #define IRQ_GPCIN5 (15)
- #define IRQ_GPCIN6 (16)
- #define IRQ_GPCIN7 (17)
- #define IRQ_MSTXINT (18)
- #define IRQ_MSRXINT (19)
- #define IRQ_MSSTOPERRINT (20)
- #define IRQ_TPTXINT (21)
- #define IRQ_TPRXINT (22)
- #define IRQ_TPSTOPERRINT (23)
- #define SSPXMTINT (24)
- #define SSPRCVINT (25)
- #define SSPROR (26)
- #define AUDXMTDMADONEA (32)
- #define AUDRCVDMADONEA (33)
- #define AUDXMTDMADONEB (34)
- #define AUDRCVDMADONEB (35)
- #define AUDTFSR (36)
- #define AUDRFSR (37)
- #define AUDTUR (38)
- #define AUDROR (39)
- #define AUDDTS (40)
- #define AUDRDD (41)
- #define AUDSTO (42)
- #define IRQ_USBPWR (43)
- #define IRQ_HCIM (44)
- #define IRQ_HCIBUFFACC (45)
- #define IRQ_HCIRMTWKP (46)
- #define IRQ_NHCIMFCIR (47)
- #define IRQ_USB_PORT_RESUME (48)
- #define IRQ_S0_READY_NINT (49)
- #define IRQ_S1_READY_NINT (50)
- #define IRQ_S0_CD_VALID (51)
- #define IRQ_S1_CD_VALID (52)
- #define IRQ_S0_BVD1_STSCHG (53)
- #define IRQ_S1_BVD1_STSCHG (54)
- #define SA1111_IRQ_NR (55)
- extern void sa1110_mb_enable(void);
- extern void sa1110_mb_disable(void);
- /*
- * We keep the following data for the overall SA1111. Note that the
- * struct device and struct resource are "fake"; they should be supplied
- * by the bus above us. However, in the interests of getting all SA1111
- * drivers converted over to the device model, we provide this as an
- * anchor point for all the other drivers.
- */
- struct sa1111 {
- struct device *dev;
- struct clk *clk;
- unsigned long phys;
- int irq;
- int irq_base; /* base for cascaded on-chip IRQs */
- spinlock_t lock;
- void __iomem *base;
- struct sa1111_platform_data *pdata;
- struct irq_domain *irqdomain;
- struct gpio_chip gc;
- #ifdef CONFIG_PM
- void *saved_state;
- #endif
- };
- /*
- * We _really_ need to eliminate this. Its only users
- * are the PWM and DMA checking code.
- */
- static struct sa1111 *g_sa1111;
- struct sa1111_dev_info {
- unsigned long offset;
- unsigned long skpcr_mask;
- bool dma;
- unsigned int devid;
- unsigned int hwirq[6];
- };
- static struct sa1111_dev_info sa1111_devices[] = {
- {
- .offset = SA1111_USB,
- .skpcr_mask = SKPCR_UCLKEN,
- .dma = true,
- .devid = SA1111_DEVID_USB,
- .hwirq = {
- IRQ_USBPWR,
- IRQ_HCIM,
- IRQ_HCIBUFFACC,
- IRQ_HCIRMTWKP,
- IRQ_NHCIMFCIR,
- IRQ_USB_PORT_RESUME
- },
- },
- {
- .offset = 0x0600,
- .skpcr_mask = SKPCR_I2SCLKEN | SKPCR_L3CLKEN,
- .dma = true,
- .devid = SA1111_DEVID_SAC,
- .hwirq = {
- AUDXMTDMADONEA,
- AUDXMTDMADONEB,
- AUDRCVDMADONEA,
- AUDRCVDMADONEB
- },
- },
- {
- .offset = 0x0800,
- .skpcr_mask = SKPCR_SCLKEN,
- .devid = SA1111_DEVID_SSP,
- },
- {
- .offset = SA1111_KBD,
- .skpcr_mask = SKPCR_PTCLKEN,
- .devid = SA1111_DEVID_PS2_KBD,
- .hwirq = {
- IRQ_TPRXINT,
- IRQ_TPTXINT
- },
- },
- {
- .offset = SA1111_MSE,
- .skpcr_mask = SKPCR_PMCLKEN,
- .devid = SA1111_DEVID_PS2_MSE,
- .hwirq = {
- IRQ_MSRXINT,
- IRQ_MSTXINT
- },
- },
- {
- .offset = 0x1800,
- .skpcr_mask = 0,
- .devid = SA1111_DEVID_PCMCIA,
- .hwirq = {
- IRQ_S0_READY_NINT,
- IRQ_S0_CD_VALID,
- IRQ_S0_BVD1_STSCHG,
- IRQ_S1_READY_NINT,
- IRQ_S1_CD_VALID,
- IRQ_S1_BVD1_STSCHG,
- },
- },
- };
- static int sa1111_map_irq(struct sa1111 *sachip, irq_hw_number_t hwirq)
- {
- return irq_create_mapping(sachip->irqdomain, hwirq);
- }
- /*
- * SA1111 interrupt support. Since clearing an IRQ while there are
- * active IRQs causes the interrupt output to pulse, the upper levels
- * will call us again if there are more interrupts to process.
- */
- static void sa1111_irq_handler(struct irq_desc *desc)
- {
- unsigned int stat0, stat1, i;
- struct sa1111 *sachip = irq_desc_get_handler_data(desc);
- struct irq_domain *irqdomain;
- void __iomem *mapbase = sachip->base + SA1111_INTC;
- stat0 = readl_relaxed(mapbase + SA1111_INTSTATCLR0);
- stat1 = readl_relaxed(mapbase + SA1111_INTSTATCLR1);
- writel_relaxed(stat0, mapbase + SA1111_INTSTATCLR0);
- desc->irq_data.chip->irq_ack(&desc->irq_data);
- writel_relaxed(stat1, mapbase + SA1111_INTSTATCLR1);
- if (stat0 == 0 && stat1 == 0) {
- do_bad_IRQ(desc);
- return;
- }
- irqdomain = sachip->irqdomain;
- for (i = 0; stat0; i++, stat0 >>= 1)
- if (stat0 & 1)
- generic_handle_domain_irq(irqdomain, i);
- for (i = 32; stat1; i++, stat1 >>= 1)
- if (stat1 & 1)
- generic_handle_domain_irq(irqdomain, i);
- /* For level-based interrupts */
- desc->irq_data.chip->irq_unmask(&desc->irq_data);
- }
- static u32 sa1111_irqmask(struct irq_data *d)
- {
- return BIT(irqd_to_hwirq(d) & 31);
- }
- static int sa1111_irqbank(struct irq_data *d)
- {
- return (irqd_to_hwirq(d) / 32) * 4;
- }
- static void sa1111_ack_irq(struct irq_data *d)
- {
- }
- static void sa1111_mask_irq(struct irq_data *d)
- {
- struct sa1111 *sachip = irq_data_get_irq_chip_data(d);
- void __iomem *mapbase = sachip->base + SA1111_INTC + sa1111_irqbank(d);
- u32 ie;
- ie = readl_relaxed(mapbase + SA1111_INTEN0);
- ie &= ~sa1111_irqmask(d);
- writel(ie, mapbase + SA1111_INTEN0);
- }
- static void sa1111_unmask_irq(struct irq_data *d)
- {
- struct sa1111 *sachip = irq_data_get_irq_chip_data(d);
- void __iomem *mapbase = sachip->base + SA1111_INTC + sa1111_irqbank(d);
- u32 ie;
- ie = readl_relaxed(mapbase + SA1111_INTEN0);
- ie |= sa1111_irqmask(d);
- writel_relaxed(ie, mapbase + SA1111_INTEN0);
- }
- /*
- * Attempt to re-trigger the interrupt. The SA1111 contains a register
- * (INTSET) which claims to do this. However, in practice no amount of
- * manipulation of INTEN and INTSET guarantees that the interrupt will
- * be triggered. In fact, its very difficult, if not impossible to get
- * INTSET to re-trigger the interrupt.
- */
- static int sa1111_retrigger_irq(struct irq_data *d)
- {
- struct sa1111 *sachip = irq_data_get_irq_chip_data(d);
- void __iomem *mapbase = sachip->base + SA1111_INTC + sa1111_irqbank(d);
- u32 ip, mask = sa1111_irqmask(d);
- int i;
- ip = readl_relaxed(mapbase + SA1111_INTPOL0);
- for (i = 0; i < 8; i++) {
- writel_relaxed(ip ^ mask, mapbase + SA1111_INTPOL0);
- writel_relaxed(ip, mapbase + SA1111_INTPOL0);
- if (readl_relaxed(mapbase + SA1111_INTSTATCLR0) & mask)
- break;
- }
- if (i == 8) {
- pr_err("Danger Will Robinson: failed to re-trigger IRQ%d\n",
- d->irq);
- return 0;
- }
- return 1;
- }
- static int sa1111_type_irq(struct irq_data *d, unsigned int flags)
- {
- struct sa1111 *sachip = irq_data_get_irq_chip_data(d);
- void __iomem *mapbase = sachip->base + SA1111_INTC + sa1111_irqbank(d);
- u32 ip, mask = sa1111_irqmask(d);
- if (flags == IRQ_TYPE_PROBE)
- return 0;
- if ((!(flags & IRQ_TYPE_EDGE_RISING) ^ !(flags & IRQ_TYPE_EDGE_FALLING)) == 0)
- return -EINVAL;
- ip = readl_relaxed(mapbase + SA1111_INTPOL0);
- if (flags & IRQ_TYPE_EDGE_RISING)
- ip &= ~mask;
- else
- ip |= mask;
- writel_relaxed(ip, mapbase + SA1111_INTPOL0);
- writel_relaxed(ip, mapbase + SA1111_WAKEPOL0);
- return 0;
- }
- static int sa1111_wake_irq(struct irq_data *d, unsigned int on)
- {
- struct sa1111 *sachip = irq_data_get_irq_chip_data(d);
- void __iomem *mapbase = sachip->base + SA1111_INTC + sa1111_irqbank(d);
- u32 we, mask = sa1111_irqmask(d);
- we = readl_relaxed(mapbase + SA1111_WAKEEN0);
- if (on)
- we |= mask;
- else
- we &= ~mask;
- writel_relaxed(we, mapbase + SA1111_WAKEEN0);
- return 0;
- }
- static struct irq_chip sa1111_irq_chip = {
- .name = "SA1111",
- .irq_ack = sa1111_ack_irq,
- .irq_mask = sa1111_mask_irq,
- .irq_unmask = sa1111_unmask_irq,
- .irq_retrigger = sa1111_retrigger_irq,
- .irq_set_type = sa1111_type_irq,
- .irq_set_wake = sa1111_wake_irq,
- };
- static int sa1111_irqdomain_map(struct irq_domain *d, unsigned int irq,
- irq_hw_number_t hwirq)
- {
- struct sa1111 *sachip = d->host_data;
- /* Disallow unavailable interrupts */
- if (hwirq > SSPROR && hwirq < AUDXMTDMADONEA)
- return -EINVAL;
- irq_set_chip_data(irq, sachip);
- irq_set_chip_and_handler(irq, &sa1111_irq_chip, handle_edge_irq);
- irq_clear_status_flags(irq, IRQ_NOREQUEST | IRQ_NOPROBE);
- return 0;
- }
- static const struct irq_domain_ops sa1111_irqdomain_ops = {
- .map = sa1111_irqdomain_map,
- .xlate = irq_domain_xlate_twocell,
- };
- static int sa1111_setup_irq(struct sa1111 *sachip, unsigned irq_base)
- {
- void __iomem *irqbase = sachip->base + SA1111_INTC;
- int ret;
- /*
- * We're guaranteed that this region hasn't been taken.
- */
- request_mem_region(sachip->phys + SA1111_INTC, 512, "irq");
- ret = irq_alloc_descs(-1, irq_base, SA1111_IRQ_NR, -1);
- if (ret <= 0) {
- dev_err(sachip->dev, "unable to allocate %u irqs: %d\n",
- SA1111_IRQ_NR, ret);
- if (ret == 0)
- ret = -EINVAL;
- return ret;
- }
- sachip->irq_base = ret;
- /* disable all IRQs */
- writel_relaxed(0, irqbase + SA1111_INTEN0);
- writel_relaxed(0, irqbase + SA1111_INTEN1);
- writel_relaxed(0, irqbase + SA1111_WAKEEN0);
- writel_relaxed(0, irqbase + SA1111_WAKEEN1);
- /*
- * detect on rising edge. Note: Feb 2001 Errata for SA1111
- * specifies that S0ReadyInt and S1ReadyInt should be '1'.
- */
- writel_relaxed(0, irqbase + SA1111_INTPOL0);
- writel_relaxed(BIT(IRQ_S0_READY_NINT & 31) |
- BIT(IRQ_S1_READY_NINT & 31),
- irqbase + SA1111_INTPOL1);
- /* clear all IRQs */
- writel_relaxed(~0, irqbase + SA1111_INTSTATCLR0);
- writel_relaxed(~0, irqbase + SA1111_INTSTATCLR1);
- sachip->irqdomain = irq_domain_add_linear(NULL, SA1111_IRQ_NR,
- &sa1111_irqdomain_ops,
- sachip);
- if (!sachip->irqdomain) {
- irq_free_descs(sachip->irq_base, SA1111_IRQ_NR);
- return -ENOMEM;
- }
- irq_domain_associate_many(sachip->irqdomain,
- sachip->irq_base + IRQ_GPAIN0,
- IRQ_GPAIN0, SSPROR + 1 - IRQ_GPAIN0);
- irq_domain_associate_many(sachip->irqdomain,
- sachip->irq_base + AUDXMTDMADONEA,
- AUDXMTDMADONEA,
- IRQ_S1_BVD1_STSCHG + 1 - AUDXMTDMADONEA);
- /*
- * Register SA1111 interrupt
- */
- irq_set_irq_type(sachip->irq, IRQ_TYPE_EDGE_RISING);
- irq_set_chained_handler_and_data(sachip->irq, sa1111_irq_handler,
- sachip);
- dev_info(sachip->dev, "Providing IRQ%u-%u\n",
- sachip->irq_base, sachip->irq_base + SA1111_IRQ_NR - 1);
- return 0;
- }
- static void sa1111_remove_irq(struct sa1111 *sachip)
- {
- struct irq_domain *domain = sachip->irqdomain;
- void __iomem *irqbase = sachip->base + SA1111_INTC;
- int i;
- /* disable all IRQs */
- writel_relaxed(0, irqbase + SA1111_INTEN0);
- writel_relaxed(0, irqbase + SA1111_INTEN1);
- writel_relaxed(0, irqbase + SA1111_WAKEEN0);
- writel_relaxed(0, irqbase + SA1111_WAKEEN1);
- irq_set_chained_handler_and_data(sachip->irq, NULL, NULL);
- for (i = 0; i < SA1111_IRQ_NR; i++)
- irq_dispose_mapping(irq_find_mapping(domain, i));
- irq_domain_remove(domain);
- release_mem_region(sachip->phys + SA1111_INTC, 512);
- }
- enum {
- SA1111_GPIO_PXDDR = (SA1111_GPIO_PADDR - SA1111_GPIO_PADDR),
- SA1111_GPIO_PXDRR = (SA1111_GPIO_PADRR - SA1111_GPIO_PADDR),
- SA1111_GPIO_PXDWR = (SA1111_GPIO_PADWR - SA1111_GPIO_PADDR),
- SA1111_GPIO_PXSDR = (SA1111_GPIO_PASDR - SA1111_GPIO_PADDR),
- SA1111_GPIO_PXSSR = (SA1111_GPIO_PASSR - SA1111_GPIO_PADDR),
- };
- static struct sa1111 *gc_to_sa1111(struct gpio_chip *gc)
- {
- return container_of(gc, struct sa1111, gc);
- }
- static void __iomem *sa1111_gpio_map_reg(struct sa1111 *sachip, unsigned offset)
- {
- void __iomem *reg = sachip->base + SA1111_GPIO;
- if (offset < 4)
- return reg + SA1111_GPIO_PADDR;
- if (offset < 10)
- return reg + SA1111_GPIO_PBDDR;
- if (offset < 18)
- return reg + SA1111_GPIO_PCDDR;
- return NULL;
- }
- static u32 sa1111_gpio_map_bit(unsigned offset)
- {
- if (offset < 4)
- return BIT(offset);
- if (offset < 10)
- return BIT(offset - 4);
- if (offset < 18)
- return BIT(offset - 10);
- return 0;
- }
- static void sa1111_gpio_modify(void __iomem *reg, u32 mask, u32 set)
- {
- u32 val;
- val = readl_relaxed(reg);
- val &= ~mask;
- val |= mask & set;
- writel_relaxed(val, reg);
- }
- static int sa1111_gpio_get_direction(struct gpio_chip *gc, unsigned offset)
- {
- struct sa1111 *sachip = gc_to_sa1111(gc);
- void __iomem *reg = sa1111_gpio_map_reg(sachip, offset);
- u32 mask = sa1111_gpio_map_bit(offset);
- return !!(readl_relaxed(reg + SA1111_GPIO_PXDDR) & mask);
- }
- static int sa1111_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
- {
- struct sa1111 *sachip = gc_to_sa1111(gc);
- unsigned long flags;
- void __iomem *reg = sa1111_gpio_map_reg(sachip, offset);
- u32 mask = sa1111_gpio_map_bit(offset);
- spin_lock_irqsave(&sachip->lock, flags);
- sa1111_gpio_modify(reg + SA1111_GPIO_PXDDR, mask, mask);
- sa1111_gpio_modify(reg + SA1111_GPIO_PXSDR, mask, mask);
- spin_unlock_irqrestore(&sachip->lock, flags);
- return 0;
- }
- static int sa1111_gpio_direction_output(struct gpio_chip *gc, unsigned offset,
- int value)
- {
- struct sa1111 *sachip = gc_to_sa1111(gc);
- unsigned long flags;
- void __iomem *reg = sa1111_gpio_map_reg(sachip, offset);
- u32 mask = sa1111_gpio_map_bit(offset);
- spin_lock_irqsave(&sachip->lock, flags);
- sa1111_gpio_modify(reg + SA1111_GPIO_PXDWR, mask, value ? mask : 0);
- sa1111_gpio_modify(reg + SA1111_GPIO_PXSSR, mask, value ? mask : 0);
- sa1111_gpio_modify(reg + SA1111_GPIO_PXDDR, mask, 0);
- sa1111_gpio_modify(reg + SA1111_GPIO_PXSDR, mask, 0);
- spin_unlock_irqrestore(&sachip->lock, flags);
- return 0;
- }
- static int sa1111_gpio_get(struct gpio_chip *gc, unsigned offset)
- {
- struct sa1111 *sachip = gc_to_sa1111(gc);
- void __iomem *reg = sa1111_gpio_map_reg(sachip, offset);
- u32 mask = sa1111_gpio_map_bit(offset);
- return !!(readl_relaxed(reg + SA1111_GPIO_PXDRR) & mask);
- }
- static void sa1111_gpio_set(struct gpio_chip *gc, unsigned offset, int value)
- {
- struct sa1111 *sachip = gc_to_sa1111(gc);
- unsigned long flags;
- void __iomem *reg = sa1111_gpio_map_reg(sachip, offset);
- u32 mask = sa1111_gpio_map_bit(offset);
- spin_lock_irqsave(&sachip->lock, flags);
- sa1111_gpio_modify(reg + SA1111_GPIO_PXDWR, mask, value ? mask : 0);
- sa1111_gpio_modify(reg + SA1111_GPIO_PXSSR, mask, value ? mask : 0);
- spin_unlock_irqrestore(&sachip->lock, flags);
- }
- static void sa1111_gpio_set_multiple(struct gpio_chip *gc, unsigned long *mask,
- unsigned long *bits)
- {
- struct sa1111 *sachip = gc_to_sa1111(gc);
- unsigned long flags;
- void __iomem *reg = sachip->base + SA1111_GPIO;
- u32 msk, val;
- msk = *mask;
- val = *bits;
- spin_lock_irqsave(&sachip->lock, flags);
- sa1111_gpio_modify(reg + SA1111_GPIO_PADWR, msk & 15, val);
- sa1111_gpio_modify(reg + SA1111_GPIO_PASSR, msk & 15, val);
- sa1111_gpio_modify(reg + SA1111_GPIO_PBDWR, (msk >> 4) & 255, val >> 4);
- sa1111_gpio_modify(reg + SA1111_GPIO_PBSSR, (msk >> 4) & 255, val >> 4);
- sa1111_gpio_modify(reg + SA1111_GPIO_PCDWR, (msk >> 12) & 255, val >> 12);
- sa1111_gpio_modify(reg + SA1111_GPIO_PCSSR, (msk >> 12) & 255, val >> 12);
- spin_unlock_irqrestore(&sachip->lock, flags);
- }
- static int sa1111_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
- {
- struct sa1111 *sachip = gc_to_sa1111(gc);
- return sa1111_map_irq(sachip, offset);
- }
- static int sa1111_setup_gpios(struct sa1111 *sachip)
- {
- sachip->gc.label = "sa1111";
- sachip->gc.parent = sachip->dev;
- sachip->gc.owner = THIS_MODULE;
- sachip->gc.get_direction = sa1111_gpio_get_direction;
- sachip->gc.direction_input = sa1111_gpio_direction_input;
- sachip->gc.direction_output = sa1111_gpio_direction_output;
- sachip->gc.get = sa1111_gpio_get;
- sachip->gc.set = sa1111_gpio_set;
- sachip->gc.set_multiple = sa1111_gpio_set_multiple;
- sachip->gc.to_irq = sa1111_gpio_to_irq;
- sachip->gc.base = -1;
- sachip->gc.ngpio = 18;
- return devm_gpiochip_add_data(sachip->dev, &sachip->gc, sachip);
- }
- /*
- * Bring the SA1111 out of reset. This requires a set procedure:
- * 1. nRESET asserted (by hardware)
- * 2. CLK turned on from SA1110
- * 3. nRESET deasserted
- * 4. VCO turned on, PLL_BYPASS turned off
- * 5. Wait lock time, then assert RCLKEn
- * 7. PCR set to allow clocking of individual functions
- *
- * Until we've done this, the only registers we can access are:
- * SBI_SKCR
- * SBI_SMCR
- * SBI_SKID
- */
- static void sa1111_wake(struct sa1111 *sachip)
- {
- unsigned long flags, r;
- spin_lock_irqsave(&sachip->lock, flags);
- clk_enable(sachip->clk);
- /*
- * Turn VCO on, and disable PLL Bypass.
- */
- r = readl_relaxed(sachip->base + SA1111_SKCR);
- r &= ~SKCR_VCO_OFF;
- writel_relaxed(r, sachip->base + SA1111_SKCR);
- r |= SKCR_PLL_BYPASS | SKCR_OE_EN;
- writel_relaxed(r, sachip->base + SA1111_SKCR);
- /*
- * Wait lock time. SA1111 manual _doesn't_
- * specify a figure for this! We choose 100us.
- */
- udelay(100);
- /*
- * Enable RCLK. We also ensure that RDYEN is set.
- */
- r |= SKCR_RCLKEN | SKCR_RDYEN;
- writel_relaxed(r, sachip->base + SA1111_SKCR);
- /*
- * Wait 14 RCLK cycles for the chip to finish coming out
- * of reset. (RCLK=24MHz). This is 590ns.
- */
- udelay(1);
- /*
- * Ensure all clocks are initially off.
- */
- writel_relaxed(0, sachip->base + SA1111_SKPCR);
- spin_unlock_irqrestore(&sachip->lock, flags);
- }
- #ifdef CONFIG_ARCH_SA1100
- static u32 sa1111_dma_mask[] = {
- ~0,
- ~(1 << 20),
- ~(1 << 23),
- ~(1 << 24),
- ~(1 << 25),
- ~(1 << 20),
- ~(1 << 20),
- 0,
- };
- /*
- * Configure the SA1111 shared memory controller.
- */
- void
- sa1111_configure_smc(struct sa1111 *sachip, int sdram, unsigned int drac,
- unsigned int cas_latency)
- {
- unsigned int smcr = SMCR_DTIM | SMCR_MBGE | FInsrt(drac, SMCR_DRAC);
- if (cas_latency == 3)
- smcr |= SMCR_CLAT;
- writel_relaxed(smcr, sachip->base + SA1111_SMCR);
- /*
- * Now clear the bits in the DMA mask to work around the SA1111
- * DMA erratum (Intel StrongARM SA-1111 Microprocessor Companion
- * Chip Specification Update, June 2000, Erratum #7).
- */
- if (sachip->dev->dma_mask)
- *sachip->dev->dma_mask &= sa1111_dma_mask[drac >> 2];
- sachip->dev->coherent_dma_mask &= sa1111_dma_mask[drac >> 2];
- }
- #endif
- static void sa1111_dev_release(struct device *_dev)
- {
- struct sa1111_dev *dev = to_sa1111_device(_dev);
- kfree(dev);
- }
- static int
- sa1111_init_one_child(struct sa1111 *sachip, struct resource *parent,
- struct sa1111_dev_info *info)
- {
- struct sa1111_dev *dev;
- unsigned i;
- int ret;
- dev = kzalloc(sizeof(struct sa1111_dev), GFP_KERNEL);
- if (!dev) {
- ret = -ENOMEM;
- goto err_alloc;
- }
- device_initialize(&dev->dev);
- dev_set_name(&dev->dev, "%4.4lx", info->offset);
- dev->devid = info->devid;
- dev->dev.parent = sachip->dev;
- dev->dev.bus = &sa1111_bus_type;
- dev->dev.release = sa1111_dev_release;
- dev->res.start = sachip->phys + info->offset;
- dev->res.end = dev->res.start + 511;
- dev->res.name = dev_name(&dev->dev);
- dev->res.flags = IORESOURCE_MEM;
- dev->mapbase = sachip->base + info->offset;
- dev->skpcr_mask = info->skpcr_mask;
- for (i = 0; i < ARRAY_SIZE(info->hwirq); i++)
- dev->hwirq[i] = info->hwirq[i];
- /*
- * If the parent device has a DMA mask associated with it, and
- * this child supports DMA, propagate it down to the children.
- */
- if (info->dma && sachip->dev->dma_mask) {
- dev->dma_mask = *sachip->dev->dma_mask;
- dev->dev.dma_mask = &dev->dma_mask;
- dev->dev.coherent_dma_mask = sachip->dev->coherent_dma_mask;
- }
- ret = request_resource(parent, &dev->res);
- if (ret) {
- dev_err(sachip->dev, "failed to allocate resource for %s\n",
- dev->res.name);
- goto err_resource;
- }
- ret = device_add(&dev->dev);
- if (ret)
- goto err_add;
- return 0;
- err_add:
- release_resource(&dev->res);
- err_resource:
- put_device(&dev->dev);
- err_alloc:
- return ret;
- }
- /**
- * sa1111_probe - probe for a single SA1111 chip.
- * @phys_addr: physical address of device.
- *
- * Probe for a SA1111 chip. This must be called
- * before any other SA1111-specific code.
- *
- * Returns:
- * %-ENODEV device not found.
- * %-EBUSY physical address already marked in-use.
- * %-EINVAL no platform data passed
- * %0 successful.
- */
- static int __sa1111_probe(struct device *me, struct resource *mem, int irq)
- {
- struct sa1111_platform_data *pd = me->platform_data;
- struct sa1111 *sachip;
- unsigned long id;
- unsigned int has_devs;
- int i, ret = -ENODEV;
- if (!pd)
- return -EINVAL;
- sachip = devm_kzalloc(me, sizeof(struct sa1111), GFP_KERNEL);
- if (!sachip)
- return -ENOMEM;
- sachip->clk = devm_clk_get(me, "SA1111_CLK");
- if (IS_ERR(sachip->clk))
- return PTR_ERR(sachip->clk);
- ret = clk_prepare(sachip->clk);
- if (ret)
- return ret;
- spin_lock_init(&sachip->lock);
- sachip->dev = me;
- dev_set_drvdata(sachip->dev, sachip);
- sachip->pdata = pd;
- sachip->phys = mem->start;
- sachip->irq = irq;
- /*
- * Map the whole region. This also maps the
- * registers for our children.
- */
- sachip->base = ioremap(mem->start, PAGE_SIZE * 2);
- if (!sachip->base) {
- ret = -ENOMEM;
- goto err_clk_unprep;
- }
- /*
- * Probe for the chip. Only touch the SBI registers.
- */
- id = readl_relaxed(sachip->base + SA1111_SKID);
- if ((id & SKID_ID_MASK) != SKID_SA1111_ID) {
- printk(KERN_DEBUG "SA1111 not detected: ID = %08lx\n", id);
- ret = -ENODEV;
- goto err_unmap;
- }
- pr_info("SA1111 Microprocessor Companion Chip: silicon revision %lx, metal revision %lx\n",
- (id & SKID_SIREV_MASK) >> 4, id & SKID_MTREV_MASK);
- /*
- * We found it. Wake the chip up, and initialise.
- */
- sa1111_wake(sachip);
- /*
- * The interrupt controller must be initialised before any
- * other device to ensure that the interrupts are available.
- */
- ret = sa1111_setup_irq(sachip, pd->irq_base);
- if (ret)
- goto err_clk;
- /* Setup the GPIOs - should really be done after the IRQ setup */
- ret = sa1111_setup_gpios(sachip);
- if (ret)
- goto err_irq;
- #ifdef CONFIG_ARCH_SA1100
- {
- unsigned int val;
- /*
- * The SDRAM configuration of the SA1110 and the SA1111 must
- * match. This is very important to ensure that SA1111 accesses
- * don't corrupt the SDRAM. Note that this ungates the SA1111's
- * MBGNT signal, so we must have called sa1110_mb_disable()
- * beforehand.
- */
- sa1111_configure_smc(sachip, 1,
- FExtr(MDCNFG, MDCNFG_SA1110_DRAC0),
- FExtr(MDCNFG, MDCNFG_SA1110_TDL0));
- /*
- * We only need to turn on DCLK whenever we want to use the
- * DMA. It can otherwise be held firmly in the off position.
- * (currently, we always enable it.)
- */
- val = readl_relaxed(sachip->base + SA1111_SKPCR);
- writel_relaxed(val | SKPCR_DCLKEN, sachip->base + SA1111_SKPCR);
- /*
- * Enable the SA1110 memory bus request and grant signals.
- */
- sa1110_mb_enable();
- }
- #endif
- g_sa1111 = sachip;
- has_devs = ~0;
- if (pd)
- has_devs &= ~pd->disable_devs;
- for (i = 0; i < ARRAY_SIZE(sa1111_devices); i++)
- if (sa1111_devices[i].devid & has_devs)
- sa1111_init_one_child(sachip, mem, &sa1111_devices[i]);
- return 0;
- err_irq:
- sa1111_remove_irq(sachip);
- err_clk:
- clk_disable(sachip->clk);
- err_unmap:
- iounmap(sachip->base);
- err_clk_unprep:
- clk_unprepare(sachip->clk);
- return ret;
- }
- static int sa1111_remove_one(struct device *dev, void *data)
- {
- struct sa1111_dev *sadev = to_sa1111_device(dev);
- if (dev->bus != &sa1111_bus_type)
- return 0;
- device_del(&sadev->dev);
- release_resource(&sadev->res);
- put_device(&sadev->dev);
- return 0;
- }
- static void __sa1111_remove(struct sa1111 *sachip)
- {
- device_for_each_child(sachip->dev, NULL, sa1111_remove_one);
- sa1111_remove_irq(sachip);
- clk_disable(sachip->clk);
- clk_unprepare(sachip->clk);
- iounmap(sachip->base);
- }
- struct sa1111_save_data {
- unsigned int skcr;
- unsigned int skpcr;
- unsigned int skcdr;
- unsigned char skaud;
- unsigned char skpwm0;
- unsigned char skpwm1;
- /*
- * Interrupt controller
- */
- unsigned int intpol0;
- unsigned int intpol1;
- unsigned int inten0;
- unsigned int inten1;
- unsigned int wakepol0;
- unsigned int wakepol1;
- unsigned int wakeen0;
- unsigned int wakeen1;
- };
- #ifdef CONFIG_PM
- static int sa1111_suspend_noirq(struct device *dev)
- {
- struct sa1111 *sachip = dev_get_drvdata(dev);
- struct sa1111_save_data *save;
- unsigned long flags;
- unsigned int val;
- void __iomem *base;
- save = kmalloc(sizeof(struct sa1111_save_data), GFP_KERNEL);
- if (!save)
- return -ENOMEM;
- sachip->saved_state = save;
- spin_lock_irqsave(&sachip->lock, flags);
- /*
- * Save state.
- */
- base = sachip->base;
- save->skcr = readl_relaxed(base + SA1111_SKCR);
- save->skpcr = readl_relaxed(base + SA1111_SKPCR);
- save->skcdr = readl_relaxed(base + SA1111_SKCDR);
- save->skaud = readl_relaxed(base + SA1111_SKAUD);
- save->skpwm0 = readl_relaxed(base + SA1111_SKPWM0);
- save->skpwm1 = readl_relaxed(base + SA1111_SKPWM1);
- writel_relaxed(0, sachip->base + SA1111_SKPWM0);
- writel_relaxed(0, sachip->base + SA1111_SKPWM1);
- base = sachip->base + SA1111_INTC;
- save->intpol0 = readl_relaxed(base + SA1111_INTPOL0);
- save->intpol1 = readl_relaxed(base + SA1111_INTPOL1);
- save->inten0 = readl_relaxed(base + SA1111_INTEN0);
- save->inten1 = readl_relaxed(base + SA1111_INTEN1);
- save->wakepol0 = readl_relaxed(base + SA1111_WAKEPOL0);
- save->wakepol1 = readl_relaxed(base + SA1111_WAKEPOL1);
- save->wakeen0 = readl_relaxed(base + SA1111_WAKEEN0);
- save->wakeen1 = readl_relaxed(base + SA1111_WAKEEN1);
- /*
- * Disable.
- */
- val = readl_relaxed(sachip->base + SA1111_SKCR);
- writel_relaxed(val | SKCR_SLEEP, sachip->base + SA1111_SKCR);
- clk_disable(sachip->clk);
- spin_unlock_irqrestore(&sachip->lock, flags);
- #ifdef CONFIG_ARCH_SA1100
- sa1110_mb_disable();
- #endif
- return 0;
- }
- /*
- * sa1111_resume - Restore the SA1111 device state.
- * @dev: device to restore
- *
- * Restore the general state of the SA1111; clock control and
- * interrupt controller. Other parts of the SA1111 must be
- * restored by their respective drivers, and must be called
- * via LDM after this function.
- */
- static int sa1111_resume_noirq(struct device *dev)
- {
- struct sa1111 *sachip = dev_get_drvdata(dev);
- struct sa1111_save_data *save;
- unsigned long flags, id;
- void __iomem *base;
- save = sachip->saved_state;
- if (!save)
- return 0;
- /*
- * Ensure that the SA1111 is still here.
- * FIXME: shouldn't do this here.
- */
- id = readl_relaxed(sachip->base + SA1111_SKID);
- if ((id & SKID_ID_MASK) != SKID_SA1111_ID) {
- __sa1111_remove(sachip);
- dev_set_drvdata(dev, NULL);
- kfree(save);
- return 0;
- }
- /*
- * First of all, wake up the chip.
- */
- sa1111_wake(sachip);
- #ifdef CONFIG_ARCH_SA1100
- /* Enable the memory bus request/grant signals */
- sa1110_mb_enable();
- #endif
- /*
- * Only lock for write ops. Also, sa1111_wake must be called with
- * released spinlock!
- */
- spin_lock_irqsave(&sachip->lock, flags);
- writel_relaxed(0, sachip->base + SA1111_INTC + SA1111_INTEN0);
- writel_relaxed(0, sachip->base + SA1111_INTC + SA1111_INTEN1);
- base = sachip->base;
- writel_relaxed(save->skcr, base + SA1111_SKCR);
- writel_relaxed(save->skpcr, base + SA1111_SKPCR);
- writel_relaxed(save->skcdr, base + SA1111_SKCDR);
- writel_relaxed(save->skaud, base + SA1111_SKAUD);
- writel_relaxed(save->skpwm0, base + SA1111_SKPWM0);
- writel_relaxed(save->skpwm1, base + SA1111_SKPWM1);
- base = sachip->base + SA1111_INTC;
- writel_relaxed(save->intpol0, base + SA1111_INTPOL0);
- writel_relaxed(save->intpol1, base + SA1111_INTPOL1);
- writel_relaxed(save->inten0, base + SA1111_INTEN0);
- writel_relaxed(save->inten1, base + SA1111_INTEN1);
- writel_relaxed(save->wakepol0, base + SA1111_WAKEPOL0);
- writel_relaxed(save->wakepol1, base + SA1111_WAKEPOL1);
- writel_relaxed(save->wakeen0, base + SA1111_WAKEEN0);
- writel_relaxed(save->wakeen1, base + SA1111_WAKEEN1);
- spin_unlock_irqrestore(&sachip->lock, flags);
- sachip->saved_state = NULL;
- kfree(save);
- return 0;
- }
- #else
- #define sa1111_suspend_noirq NULL
- #define sa1111_resume_noirq NULL
- #endif
- static int sa1111_probe(struct platform_device *pdev)
- {
- struct resource *mem;
- int irq;
- mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (!mem)
- return -EINVAL;
- irq = platform_get_irq(pdev, 0);
- if (irq < 0)
- return irq;
- return __sa1111_probe(&pdev->dev, mem, irq);
- }
- static int sa1111_remove(struct platform_device *pdev)
- {
- struct sa1111 *sachip = platform_get_drvdata(pdev);
- if (sachip) {
- #ifdef CONFIG_PM
- kfree(sachip->saved_state);
- sachip->saved_state = NULL;
- #endif
- __sa1111_remove(sachip);
- platform_set_drvdata(pdev, NULL);
- }
- return 0;
- }
- static struct dev_pm_ops sa1111_pm_ops = {
- .suspend_noirq = sa1111_suspend_noirq,
- .resume_noirq = sa1111_resume_noirq,
- };
- /*
- * Not sure if this should be on the system bus or not yet.
- * We really want some way to register a system device at
- * the per-machine level, and then have this driver pick
- * up the registered devices.
- *
- * We also need to handle the SDRAM configuration for
- * PXA250/SA1110 machine classes.
- */
- static struct platform_driver sa1111_device_driver = {
- .probe = sa1111_probe,
- .remove = sa1111_remove,
- .driver = {
- .name = "sa1111",
- .pm = &sa1111_pm_ops,
- },
- };
- /*
- * Get the parent device driver (us) structure
- * from a child function device
- */
- static inline struct sa1111 *sa1111_chip_driver(struct sa1111_dev *sadev)
- {
- return (struct sa1111 *)dev_get_drvdata(sadev->dev.parent);
- }
- /*
- * The bits in the opdiv field are non-linear.
- */
- static unsigned char opdiv_table[] = { 1, 4, 2, 8 };
- static unsigned int __sa1111_pll_clock(struct sa1111 *sachip)
- {
- unsigned int skcdr, fbdiv, ipdiv, opdiv;
- skcdr = readl_relaxed(sachip->base + SA1111_SKCDR);
- fbdiv = (skcdr & 0x007f) + 2;
- ipdiv = ((skcdr & 0x0f80) >> 7) + 2;
- opdiv = opdiv_table[(skcdr & 0x3000) >> 12];
- return 3686400 * fbdiv / (ipdiv * opdiv);
- }
- /**
- * sa1111_pll_clock - return the current PLL clock frequency.
- * @sadev: SA1111 function block
- *
- * BUG: we should look at SKCR. We also blindly believe that
- * the chip is being fed with the 3.6864MHz clock.
- *
- * Returns the PLL clock in Hz.
- */
- unsigned int sa1111_pll_clock(struct sa1111_dev *sadev)
- {
- struct sa1111 *sachip = sa1111_chip_driver(sadev);
- return __sa1111_pll_clock(sachip);
- }
- EXPORT_SYMBOL(sa1111_pll_clock);
- /**
- * sa1111_select_audio_mode - select I2S or AC link mode
- * @sadev: SA1111 function block
- * @mode: One of %SA1111_AUDIO_ACLINK or %SA1111_AUDIO_I2S
- *
- * Frob the SKCR to select AC Link mode or I2S mode for
- * the audio block.
- */
- void sa1111_select_audio_mode(struct sa1111_dev *sadev, int mode)
- {
- struct sa1111 *sachip = sa1111_chip_driver(sadev);
- unsigned long flags;
- unsigned int val;
- spin_lock_irqsave(&sachip->lock, flags);
- val = readl_relaxed(sachip->base + SA1111_SKCR);
- if (mode == SA1111_AUDIO_I2S) {
- val &= ~SKCR_SELAC;
- } else {
- val |= SKCR_SELAC;
- }
- writel_relaxed(val, sachip->base + SA1111_SKCR);
- spin_unlock_irqrestore(&sachip->lock, flags);
- }
- EXPORT_SYMBOL(sa1111_select_audio_mode);
- /**
- * sa1111_set_audio_rate - set the audio sample rate
- * @sadev: SA1111 SAC function block
- * @rate: sample rate to select
- */
- int sa1111_set_audio_rate(struct sa1111_dev *sadev, int rate)
- {
- struct sa1111 *sachip = sa1111_chip_driver(sadev);
- unsigned int div;
- if (sadev->devid != SA1111_DEVID_SAC)
- return -EINVAL;
- div = (__sa1111_pll_clock(sachip) / 256 + rate / 2) / rate;
- if (div == 0)
- div = 1;
- if (div > 128)
- div = 128;
- writel_relaxed(div - 1, sachip->base + SA1111_SKAUD);
- return 0;
- }
- EXPORT_SYMBOL(sa1111_set_audio_rate);
- /**
- * sa1111_get_audio_rate - get the audio sample rate
- * @sadev: SA1111 SAC function block device
- */
- int sa1111_get_audio_rate(struct sa1111_dev *sadev)
- {
- struct sa1111 *sachip = sa1111_chip_driver(sadev);
- unsigned long div;
- if (sadev->devid != SA1111_DEVID_SAC)
- return -EINVAL;
- div = readl_relaxed(sachip->base + SA1111_SKAUD) + 1;
- return __sa1111_pll_clock(sachip) / (256 * div);
- }
- EXPORT_SYMBOL(sa1111_get_audio_rate);
- /*
- * Individual device operations.
- */
- /**
- * sa1111_enable_device - enable an on-chip SA1111 function block
- * @sadev: SA1111 function block device to enable
- */
- int sa1111_enable_device(struct sa1111_dev *sadev)
- {
- struct sa1111 *sachip = sa1111_chip_driver(sadev);
- unsigned long flags;
- unsigned int val;
- int ret = 0;
- if (sachip->pdata && sachip->pdata->enable)
- ret = sachip->pdata->enable(sachip->pdata->data, sadev->devid);
- if (ret == 0) {
- spin_lock_irqsave(&sachip->lock, flags);
- val = readl_relaxed(sachip->base + SA1111_SKPCR);
- writel_relaxed(val | sadev->skpcr_mask, sachip->base + SA1111_SKPCR);
- spin_unlock_irqrestore(&sachip->lock, flags);
- }
- return ret;
- }
- EXPORT_SYMBOL(sa1111_enable_device);
- /**
- * sa1111_disable_device - disable an on-chip SA1111 function block
- * @sadev: SA1111 function block device to disable
- */
- void sa1111_disable_device(struct sa1111_dev *sadev)
- {
- struct sa1111 *sachip = sa1111_chip_driver(sadev);
- unsigned long flags;
- unsigned int val;
- spin_lock_irqsave(&sachip->lock, flags);
- val = readl_relaxed(sachip->base + SA1111_SKPCR);
- writel_relaxed(val & ~sadev->skpcr_mask, sachip->base + SA1111_SKPCR);
- spin_unlock_irqrestore(&sachip->lock, flags);
- if (sachip->pdata && sachip->pdata->disable)
- sachip->pdata->disable(sachip->pdata->data, sadev->devid);
- }
- EXPORT_SYMBOL(sa1111_disable_device);
- int sa1111_get_irq(struct sa1111_dev *sadev, unsigned num)
- {
- struct sa1111 *sachip = sa1111_chip_driver(sadev);
- if (num >= ARRAY_SIZE(sadev->hwirq))
- return -EINVAL;
- return sa1111_map_irq(sachip, sadev->hwirq[num]);
- }
- EXPORT_SYMBOL_GPL(sa1111_get_irq);
- /*
- * SA1111 "Register Access Bus."
- *
- * We model this as a regular bus type, and hang devices directly
- * off this.
- */
- static int sa1111_match(struct device *_dev, struct device_driver *_drv)
- {
- struct sa1111_dev *dev = to_sa1111_device(_dev);
- struct sa1111_driver *drv = SA1111_DRV(_drv);
- return !!(dev->devid & drv->devid);
- }
- static int sa1111_bus_probe(struct device *dev)
- {
- struct sa1111_dev *sadev = to_sa1111_device(dev);
- struct sa1111_driver *drv = SA1111_DRV(dev->driver);
- int ret = -ENODEV;
- if (drv->probe)
- ret = drv->probe(sadev);
- return ret;
- }
- static void sa1111_bus_remove(struct device *dev)
- {
- struct sa1111_dev *sadev = to_sa1111_device(dev);
- struct sa1111_driver *drv = SA1111_DRV(dev->driver);
- if (drv->remove)
- drv->remove(sadev);
- }
- struct bus_type sa1111_bus_type = {
- .name = "sa1111-rab",
- .match = sa1111_match,
- .probe = sa1111_bus_probe,
- .remove = sa1111_bus_remove,
- };
- EXPORT_SYMBOL(sa1111_bus_type);
- int sa1111_driver_register(struct sa1111_driver *driver)
- {
- driver->drv.bus = &sa1111_bus_type;
- return driver_register(&driver->drv);
- }
- EXPORT_SYMBOL(sa1111_driver_register);
- void sa1111_driver_unregister(struct sa1111_driver *driver)
- {
- driver_unregister(&driver->drv);
- }
- EXPORT_SYMBOL(sa1111_driver_unregister);
- static int __init sa1111_init(void)
- {
- int ret = bus_register(&sa1111_bus_type);
- if (ret == 0)
- platform_driver_register(&sa1111_device_driver);
- return ret;
- }
- static void __exit sa1111_exit(void)
- {
- platform_driver_unregister(&sa1111_device_driver);
- bus_unregister(&sa1111_bus_type);
- }
- subsys_initcall(sa1111_init);
- module_exit(sa1111_exit);
- MODULE_DESCRIPTION("Intel Corporation SA1111 core driver");
- MODULE_LICENSE("GPL");
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