PIC32 clock module consists of multiple oscillators, PLLs, mutiplexers and dividers capable of supplying clock to various controllers on or off-chip.

Signed-off-by: Purna Chandra Mandal purna.mandal@microchip.com Reviewed-by: Simon Glass sjg@chromium.org Reviewed-by: Daniel Schwierzeck daniel.schwierzeck@gmail.com

---

Changes in v4: None Changes in v3: - rename clk-pic32.c to clk_pic32.c - update clock binding documentation - replace pic32_ioremap() with ioremap() - separate MPLL initialization constants

Changes in v2: - add mpll get clock rate

.../clock/microchip,pic32-clock.txt | 33 ++ drivers/clk/Makefile | 1 + drivers/clk/clk_pic32.c | 433 +++++++++++++++++++++ include/dt-bindings/clock/microchip,clock.h | 29 ++ 4 files changed, 496 insertions(+) create mode 100644 doc/device-tree-bindings/clock/microchip,pic32-clock.txt create mode 100644 drivers/clk/clk_pic32.c create mode 100644 include/dt-bindings/clock/microchip,clock.h

diff --git a/doc/device-tree-bindings/clock/microchip,pic32-clock.txt b/doc/device-tree-bindings/clock/microchip,pic32-clock.txt new file mode 100644 index 0000000..f185ce0 --- /dev/null +++ b/doc/device-tree-bindings/clock/microchip,pic32-clock.txt @@ -0,0 +1,33 @@ +* Microchip PIC32 Clock and Oscillator + +Microchip PIC32 clock tree consists of few oscillators, PLLs, +multiplexers and few divider modules capable of supplying clocks +to various controllers within SoC and also to off-chip. + +PIC32 clock controller output is defined by indices as defined +in [0] + +[0] include/dt-bindings/clock/microchip,clock.h + +Required Properties: +- compatible: should be "microchip,pic32mzda_clk" +- reg: physical base address of the controller and length of memory mapped + region. +- #clock-cells: should be 1. + +Example: Clock controller node: + + clock: clk@1f801200 { + compatible = "microchip,pic32mzda-clk"; + reg = <0x1f801200 0x1000>; + }; + +Example: UART controller node that consumes the clock generated by the clock +controller: + + uart1: serial@1f822000 { + compatible = "microchip,pic32mzda-uart"; + reg = <0xbf822000 0x50>; + interrupts = <112 IRQ_TYPE_LEVEL_HIGH>; + clocks = <&clock PB2CLK>; + }; diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile index 8aa81f4..c9144e3 100644 --- a/drivers/clk/Makefile +++ b/drivers/clk/Makefile @@ -9,3 +9,4 @@ obj-$(CONFIG_CLK) += clk-uclass.o clk_fixed_rate.o obj-$(CONFIG_ROCKCHIP_RK3036) += clk_rk3036.o obj-$(CONFIG_ROCKCHIP_RK3288) += clk_rk3288.o obj-$(CONFIG_SANDBOX) += clk_sandbox.o +obj-$(CONFIG_MACH_PIC32) += clk_pic32.o diff --git a/drivers/clk/clk_pic32.c b/drivers/clk/clk_pic32.c new file mode 100644 index 0000000..5d88354 --- /dev/null +++ b/drivers/clk/clk_pic32.c @@ -0,0 +1,433 @@ +/* + * Copyright (C) 2015 Purna Chandra Mandal purna.mandal@microchip.com + * + * SPDX-License-Identifier: GPL-2.0+ + * + */ + +#include <common.h> +#include <clk.h> +#include <dm.h> +#include <div64.h> +#include <wait_bit.h> +#include <dm/lists.h> +#include <asm/io.h> +#include <mach/pic32.h> +#include <dt-bindings/clock/microchip,clock.h> + +DECLARE_GLOBAL_DATA_PTR; + +/* Primary oscillator */ +#define SYS_POSC_CLK_HZ 24000000 + +/* FRC clk rate */ +#define SYS_FRC_CLK_HZ 8000000 + +/* Clock Registers */ +#define OSCCON 0x0000 +#define OSCTUNE 0x0010 +#define SPLLCON 0x0020 +#define REFO1CON 0x0080 +#define REFO1TRIM 0x0090 +#define PB1DIV 0x0140 + +/* SPLL */ +#define ICLK_MASK 0x00000080 +#define PLLIDIV_MASK 0x00000007 +#define PLLODIV_MASK 0x00000007 +#define CUROSC_MASK 0x00000007 +#define PLLMUL_MASK 0x0000007F +#define FRCDIV_MASK 0x00000007 + +/* PBCLK */ +#define PBDIV_MASK 0x00000007 + +/* SYSCLK MUX */ +#define SCLK_SRC_FRC1 0 +#define SCLK_SRC_SPLL 1 +#define SCLK_SRC_POSC 2 +#define SCLK_SRC_FRC2 7 + +/* Reference Oscillator Control Reg fields */ +#define REFO_SEL_MASK 0x0f +#define REFO_SEL_SHIFT 0 +#define REFO_ACTIVE BIT(8) +#define REFO_DIVSW_EN BIT(9) +#define REFO_OE BIT(12) +#define REFO_ON BIT(15) +#define REFO_DIV_SHIFT 16 +#define REFO_DIV_MASK 0x7fff + +/* Reference Oscillator Trim Register Fields */ +#define REFO_TRIM_REG 0x10 +#define REFO_TRIM_MASK 0x1ff +#define REFO_TRIM_SHIFT 23 +#define REFO_TRIM_MAX 511 + +#define ROCLK_SRC_SCLK 0x0 +#define ROCLK_SRC_SPLL 0x7 +#define ROCLK_SRC_ROCLKI 0x8 + +/* Memory PLL */ +#define MPLL_IDIV 0x3f +#define MPLL_MULT 0xff +#define MPLL_ODIV1 0x7 +#define MPLL_ODIV2 0x7 +#define MPLL_VREG_RDY BIT(23) +#define MPLL_RDY BIT(31) +#define MPLL_IDIV_SHIFT 0 +#define MPLL_MULT_SHIFT 8 +#define MPLL_ODIV1_SHIFT 24 +#define MPLL_ODIV2_SHIFT 27 +#define MPLL_IDIV_INIT 0x03 +#define MPLL_MULT_INIT 0x32 +#define MPLL_ODIV1_INIT 0x02 +#define MPLL_ODIV2_INIT 0x01 + +struct pic32_clk_priv { + void __iomem *iobase; + void __iomem *syscfg_base; +}; + +static ulong pic32_get_pll_rate(struct pic32_clk_priv *priv) +{ + u32 iclk, idiv, odiv, mult; + ulong plliclk, v; + + v = readl(priv->iobase + SPLLCON); + iclk = (v & ICLK_MASK); + idiv = ((v >> 8) & PLLIDIV_MASK) + 1; + odiv = ((v >> 24) & PLLODIV_MASK); + mult = ((v >> 16) & PLLMUL_MASK) + 1; + + plliclk = iclk ? SYS_FRC_CLK_HZ : SYS_POSC_CLK_HZ; + + if (odiv < 2) + odiv = 2; + else if (odiv < 5) + odiv = (1 << odiv); + else + odiv = 32; + + return ((plliclk / idiv) * mult) / odiv; +} + +static ulong pic32_get_sysclk(struct pic32_clk_priv *priv) +{ + ulong v; + ulong hz; + ulong div, frcdiv; + ulong curr_osc; + + /* get clk source */ + v = readl(priv->iobase + OSCCON); + curr_osc = (v >> 12) & CUROSC_MASK; + switch (curr_osc) { + case SCLK_SRC_FRC1: + case SCLK_SRC_FRC2: + frcdiv = ((v >> 24) & FRCDIV_MASK); + div = ((1 << frcdiv) + 1) + (128 * (frcdiv == 7)); + hz = SYS_FRC_CLK_HZ / div; + break; + + case SCLK_SRC_SPLL: + hz = pic32_get_pll_rate(priv); + break; + + case SCLK_SRC_POSC: + hz = SYS_POSC_CLK_HZ; + break; + + default: + hz = 0; + printf("clk: unknown sclk_src.\n"); + break; + } + + return hz; +} + +static ulong pic32_get_pbclk(struct pic32_clk_priv *priv, int periph) +{ + void __iomem *reg; + ulong div, clk_freq; + + WARN_ON((periph < PB1CLK) || (periph > PB7CLK)); + + clk_freq = pic32_get_sysclk(priv); + + reg = priv->iobase + PB1DIV + (periph - PB1CLK) * 0x10; + div = (readl(reg) & PBDIV_MASK) + 1; + + return clk_freq / div; +} + +static ulong pic32_get_cpuclk(struct pic32_clk_priv *priv) +{ + return pic32_get_pbclk(priv, PB7CLK); +} + +static ulong pic32_set_refclk(struct pic32_clk_priv *priv, int periph, + int parent_rate, int rate, int parent_id) +{ + void __iomem *reg; + u32 div, trim, v; + u64 frac; + + WARN_ON((periph < REF1CLK) || (periph > REF5CLK)); + + /* calculate dividers, + * rate = parent_rate / [2 * (div + (trim / 512))] + */ + if (parent_rate <= rate) { + div = 0; + trim = 0; + } else { + div = parent_rate / (rate << 1); + frac = parent_rate; + frac <<= 8; + do_div(frac, rate); + frac -= (u64)(div << 9); + trim = (frac >= REFO_TRIM_MAX) ? REFO_TRIM_MAX : (u32)frac; + } + + reg = priv->iobase + REFO1CON + (periph - REF1CLK) * 0x20; + + /* disable clk */ + writel(REFO_ON | REFO_OE, reg + _CLR_OFFSET); + + /* wait till previous src change is active */ + wait_for_bit(__func__, reg, REFO_DIVSW_EN | REFO_ACTIVE, + false, CONFIG_SYS_HZ, false); + + /* parent_id */ + v = readl(reg); + v &= ~(REFO_SEL_MASK << REFO_SEL_SHIFT); + v |= (parent_id << REFO_SEL_SHIFT); + + /* apply rodiv */ + v &= ~(REFO_DIV_MASK << REFO_DIV_SHIFT); + v |= (div << REFO_DIV_SHIFT); + writel(v, reg); + + /* apply trim */ + v = readl(reg + REFO_TRIM_REG); + v &= ~(REFO_TRIM_MASK << REFO_TRIM_SHIFT); + v |= (trim << REFO_TRIM_SHIFT); + writel(v, reg + REFO_TRIM_REG); + + /* enable clk */ + writel(REFO_ON | REFO_OE, reg + _SET_OFFSET); + + /* switch divider */ + writel(REFO_DIVSW_EN, reg + _SET_OFFSET); + + /* wait for divider switching to complete */ + return wait_for_bit(__func__, reg, REFO_DIVSW_EN, false, + CONFIG_SYS_HZ, false); +} + +static ulong pic32_get_refclk(struct pic32_clk_priv *priv, int periph) +{ + u32 rodiv, rotrim, rosel, v, parent_rate; + void __iomem *reg; + u64 rate64; + + WARN_ON((periph < REF1CLK) || (periph > REF5CLK)); + + reg = priv->iobase + REFO1CON + (periph - REF1CLK) * 0x20; + v = readl(reg); + /* get rosel */ + rosel = (v >> REFO_SEL_SHIFT) & REFO_SEL_MASK; + /* get div */ + rodiv = (v >> REFO_DIV_SHIFT) & REFO_DIV_MASK; + + /* get trim */ + v = readl(reg + REFO_TRIM_REG); + rotrim = (v >> REFO_TRIM_SHIFT) & REFO_TRIM_MASK; + + if (!rodiv) + return 0; + + /* get parent rate */ + switch (rosel) { + case ROCLK_SRC_SCLK: + parent_rate = pic32_get_cpuclk(priv); + break; + case ROCLK_SRC_SPLL: + parent_rate = pic32_get_pll_rate(priv); + break; + default: + parent_rate = 0; + break; + } + + /* Calculation + * rate = parent_rate / [2 * (div + (trim / 512))] + */ + if (rotrim) { + rodiv <<= 9; + rodiv += rotrim; + rate64 = parent_rate; + rate64 <<= 8; + do_div(rate64, rodiv); + v = (u32)rate64; + } else { + v = parent_rate / (rodiv << 1); + } + return v; +} + +static ulong pic32_get_mpll_rate(struct pic32_clk_priv *priv) +{ + u32 v, idiv, mul; + u32 odiv1, odiv2; + u64 rate; + + v = readl(priv->syscfg_base + CFGMPLL); + idiv = v & MPLL_IDIV; + mul = (v >> MPLL_MULT_SHIFT) & MPLL_MULT; + odiv1 = (v >> MPLL_ODIV1_SHIFT) & MPLL_ODIV1; + odiv2 = (v >> MPLL_ODIV2_SHIFT) & MPLL_ODIV2; + + rate = (SYS_POSC_CLK_HZ / idiv) * mul; + do_div(rate, odiv1); + do_div(rate, odiv2); + + return (ulong)rate; +} + +static int pic32_mpll_init(struct pic32_clk_priv *priv) +{ + u32 v, mask; + + /* initialize */ + v = (MPLL_IDIV_INIT << MPLL_IDIV_SHIFT) | + (MPLL_MULT_INIT << MPLL_MULT_SHIFT) | + (MPLL_ODIV1_INIT << MPLL_ODIV1_SHIFT) | + (MPLL_ODIV2_INIT << MPLL_ODIV2_SHIFT); + + writel(v, priv->syscfg_base + CFGMPLL); + + /* Wait for ready */ + mask = MPLL_RDY | MPLL_VREG_RDY; + return wait_for_bit(__func__, priv->syscfg_base + CFGMPLL, mask, + true, get_tbclk(), false); +} + +static void pic32_clk_init(struct udevice *dev) +{ + const void *blob = gd->fdt_blob; + struct pic32_clk_priv *priv; + ulong rate, pll_hz; + char propname[50]; + int i; + + priv = dev_get_priv(dev); + pll_hz = pic32_get_pll_rate(priv); + + /* Initialize REFOs as not initialized and enabled on reset. */ + for (i = REF1CLK; i <= REF5CLK; i++) { + snprintf(propname, sizeof(propname), + "microchip,refo%d-frequency", i - REF1CLK + 1); + rate = fdtdec_get_int(blob, dev->of_offset, propname, 0); + if (rate) + pic32_set_refclk(priv, i, pll_hz, rate, ROCLK_SRC_SPLL); + } + + /* Memory PLL */ + pic32_mpll_init(priv); +} + +static ulong pic32_clk_get_rate(struct udevice *dev) +{ + struct pic32_clk_priv *priv = dev_get_priv(dev); + + return pic32_get_cpuclk(priv); +} + +static ulong pic32_get_periph_rate(struct udevice *dev, int periph) +{ + struct pic32_clk_priv *priv = dev_get_priv(dev); + ulong rate; + + switch (periph) { + case PB1CLK ... PB7CLK: + rate = pic32_get_pbclk(priv, periph); + break; + case REF1CLK ... REF5CLK: + rate = pic32_get_refclk(priv, periph); + break; + case PLLCLK: + rate = pic32_get_pll_rate(priv); + break; + case MPLL: + rate = pic32_get_mpll_rate(priv); + break; + default: + rate = 0; + break; + } + + return rate; +} + +static ulong pic32_set_periph_rate(struct udevice *dev, int periph, ulong rate) +{ + struct pic32_clk_priv *priv = dev_get_priv(dev); + ulong pll_hz; + + switch (periph) { + case REF1CLK ... REF5CLK: + pll_hz = pic32_get_pll_rate(priv); + pic32_set_refclk(priv, periph, pll_hz, rate, ROCLK_SRC_SPLL); + break; + default: + break; + } + + return rate; +} + +static struct clk_ops pic32_pic32_clk_ops = { + .get_rate = pic32_clk_get_rate, + .set_periph_rate = pic32_set_periph_rate, + .get_periph_rate = pic32_get_periph_rate, +}; + +static int pic32_clk_probe(struct udevice *dev) +{ + struct pic32_clk_priv *priv = dev_get_priv(dev); + fdt_addr_t addr; + fdt_size_t size; + + addr = fdtdec_get_addr_size(gd->fdt_blob, dev->of_offset, "reg", &size); + if (addr == FDT_ADDR_T_NONE) + return -EINVAL; + + priv->iobase = ioremap(addr, size); + if (!priv->iobase) + return -EINVAL; + + priv->syscfg_base = pic32_get_syscfg_base(); + + /* initialize clocks */ + pic32_clk_init(dev); + + return 0; +} + +static const struct udevice_id pic32_clk_ids[] = { + { .compatible = "microchip,pic32mzda-clk"}, + {} +}; + +U_BOOT_DRIVER(pic32_clk) = { + .name = "pic32_clk", + .id = UCLASS_CLK, + .of_match = pic32_clk_ids, + .flags = DM_FLAG_PRE_RELOC, + .ops = &pic32_pic32_clk_ops, + .probe = pic32_clk_probe, + .priv_auto_alloc_size = sizeof(struct pic32_clk_priv), +}; diff --git a/include/dt-bindings/clock/microchip,clock.h b/include/dt-bindings/clock/microchip,clock.h new file mode 100644 index 0000000..93c222d --- /dev/null +++ b/include/dt-bindings/clock/microchip,clock.h @@ -0,0 +1,29 @@ +/* + * (c) 2015 Purna Chandra Mandal purna.mandal@microchip.com + * + * SPDX-License-Identifier: GPL-2.0+ + * + */ + +#ifndef __CLK_MICROCHIP_PIC32 +#define __CLK_MICROCHIP_PIC32 + +/* clock output indices */ +#define BASECLK 0 +#define PLLCLK 1 +#define MPLL 2 +#define SYSCLK 3 +#define PB1CLK 4 +#define PB2CLK 5 +#define PB3CLK 6 +#define PB4CLK 7 +#define PB5CLK 8 +#define PB6CLK 9 +#define PB7CLK 10 +#define REF1CLK 11 +#define REF2CLK 12 +#define REF3CLK 13 +#define REF4CLK 14 +#define REF5CLK 15 + +#endif /* __CLK_MICROCHIP_PIC32 */

In PIC32 GPIO controller is part of PIC32 pin controller. PIC32 has ten independently programmable ports and each with multiple pins. Each of these pins can be configured and used as GPIO, provided they are not in use for other peripherals.

Signed-off-by: Purna Chandra Mandal purna.mandal@microchip.com Reviewed-by: Tom Rini trini@konsulko.com Reviewed-by: Simon Glass sjg@chromium.org Reviewed-by: Daniel Schwierzeck daniel.schwierzeck@gmail.com

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Changes in v4: - update kconfig dependency on DM && MACH_PIC32, and default y - drop ioremap failure check - return -EPERM if the pin is found in analog mode - drop desc->offset setting in _gpio_xlate()

Changes in v3: - add check on dev_get_addr()

Changes in v2: None

drivers/gpio/Kconfig | 7 ++ drivers/gpio/Makefile | 2 +- drivers/gpio/pic32_gpio.c | 174 ++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 182 insertions(+), 1 deletion(-) create mode 100644 drivers/gpio/pic32_gpio.c

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index e60e9fd..845dc72 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -83,4 +83,11 @@ config VYBRID_GPIO help Say yes here to support Vybrid vf610 GPIOs.

+config PIC32_GPIO + bool "Microchip PIC32 GPIO driver" + depends on DM_GPIO && MACH_PIC32 + default y + help + Say yes here to support Microchip PIC32 GPIOs. + endmenu diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile index fb4fd25..845a6d4 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -46,4 +46,4 @@ obj-$(CONFIG_STM32_GPIO) += stm32_gpio.o obj-$(CONFIG_ZYNQ_GPIO) += zynq_gpio.o obj-$(CONFIG_VYBRID_GPIO) += vybrid_gpio.o obj-$(CONFIG_HIKEY_GPIO) += hi6220_gpio.o - +obj-$(CONFIG_PIC32_GPIO) += pic32_gpio.o diff --git a/drivers/gpio/pic32_gpio.c b/drivers/gpio/pic32_gpio.c new file mode 100644 index 0000000..499b4fa --- /dev/null +++ b/drivers/gpio/pic32_gpio.c @@ -0,0 +1,174 @@ +/* + * Copyright (c) 2015 Microchip Technology Inc + * Purna Chandra Mandal purna.mandal@microchip.com + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <dm.h> +#include <errno.h> +#include <malloc.h> +#include <asm/io.h> +#include <asm/gpio.h> +#include <linux/compat.h> +#include <dt-bindings/gpio/gpio.h> +#include <mach/pic32.h> + +DECLARE_GLOBAL_DATA_PTR; + +/* Peripheral Pin Control */ +struct pic32_reg_port { + struct pic32_reg_atomic ansel; + struct pic32_reg_atomic tris; + struct pic32_reg_atomic port; + struct pic32_reg_atomic lat; + struct pic32_reg_atomic open_drain; + struct pic32_reg_atomic cnpu; + struct pic32_reg_atomic cnpd; + struct pic32_reg_atomic cncon; +}; + +enum { + MICROCHIP_GPIO_DIR_OUT, + MICROCHIP_GPIO_DIR_IN, + MICROCHIP_GPIOS_PER_BANK = 16, +}; + +struct pic32_gpio_priv { + struct pic32_reg_port *regs; + char name[2]; +}; + +static int pic32_gpio_get_value(struct udevice *dev, unsigned offset) +{ + struct pic32_gpio_priv *priv = dev_get_priv(dev); + + return !!(readl(&priv->regs->port.raw) & BIT(offset)); +} + +static int pic32_gpio_set_value(struct udevice *dev, unsigned offset, + int value) +{ + struct pic32_gpio_priv *priv = dev_get_priv(dev); + int mask = BIT(offset); + + if (value) + writel(mask, &priv->regs->port.set); + else + writel(mask, &priv->regs->port.clr); + + return 0; +} + +static int pic32_gpio_direction(struct udevice *dev, unsigned offset) +{ + struct pic32_gpio_priv *priv = dev_get_priv(dev); + + /* pin in analog mode ? */ + if (readl(&priv->regs->ansel.raw) & BIT(offset)) + return -EPERM; + + if (readl(&priv->regs->tris.raw) & BIT(offset)) + return MICROCHIP_GPIO_DIR_IN; + else + return MICROCHIP_GPIO_DIR_OUT; +} + +static int pic32_gpio_direction_input(struct udevice *dev, unsigned offset) +{ + struct pic32_gpio_priv *priv = dev_get_priv(dev); + int mask = BIT(offset); + + writel(mask, &priv->regs->ansel.clr); + writel(mask, &priv->regs->tris.set); + + return 0; +} + +static int pic32_gpio_direction_output(struct udevice *dev, + unsigned offset, int value) +{ + struct pic32_gpio_priv *priv = dev_get_priv(dev); + int mask = BIT(offset); + + writel(mask, &priv->regs->ansel.clr); + writel(mask, &priv->regs->tris.clr); + + pic32_gpio_set_value(dev, offset, value); + return 0; +} + +static int pic32_gpio_xlate(struct udevice *dev, struct gpio_desc *desc, + struct fdtdec_phandle_args *args) +{ + desc->flags = args->args[1] & GPIO_ACTIVE_LOW ? GPIOD_ACTIVE_LOW : 0; + + return 0; +} + +static int pic32_gpio_get_function(struct udevice *dev, unsigned offset) +{ + int ret = GPIOF_UNUSED; + + switch (pic32_gpio_direction(dev, offset)) { + case MICROCHIP_GPIO_DIR_OUT: + ret = GPIOF_OUTPUT; + break; + case MICROCHIP_GPIO_DIR_IN: + ret = GPIOF_INPUT; + break; + default: + ret = GPIOF_UNUSED; + break; + } + return ret; +} + +static const struct dm_gpio_ops gpio_pic32_ops = { + .direction_input = pic32_gpio_direction_input, + .direction_output = pic32_gpio_direction_output, + .get_value = pic32_gpio_get_value, + .set_value = pic32_gpio_set_value, + .get_function = pic32_gpio_get_function, + .xlate = pic32_gpio_xlate, +}; + +static int pic32_gpio_probe(struct udevice *dev) +{ + struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev); + struct pic32_gpio_priv *priv = dev_get_priv(dev); + fdt_addr_t addr; + fdt_size_t size; + char *end; + int bank; + + addr = fdtdec_get_addr_size(gd->fdt_blob, dev->of_offset, "reg", &size); + if (addr == FDT_ADDR_T_NONE) + return -EINVAL; + + priv->regs = ioremap(addr, size); + + uc_priv->gpio_count = MICROCHIP_GPIOS_PER_BANK; + /* extract bank name */ + end = strrchr(dev->name, '@'); + bank = trailing_strtoln(dev->name, end); + priv->name[0] = 'A' + bank; + uc_priv->bank_name = priv->name; + + return 0; +} + +static const struct udevice_id pic32_gpio_ids[] = { + { .compatible = "microchip,pic32mzda-gpio" }, + { } +}; + +U_BOOT_DRIVER(gpio_pic32) = { + .name = "gpio_pic32", + .id = UCLASS_GPIO, + .of_match = pic32_gpio_ids, + .ops = &gpio_pic32_ops, + .probe = pic32_gpio_probe, + .priv_auto_alloc_size = sizeof(struct pic32_gpio_priv), +};

This driver initializes PIC32 DDR2 SDRAM controller and internal DDR2 Phy module. DDR2 controller operates in half-rate mode (upto 533MHZ frequency).

Signed-off-by: Paul Thacker paul.thacker@microchip.com Signed-off-by: Purna Chandra Mandal purna.mandal@microchip.com Reviewed-by: Daniel Schwierzeck daniel.schwierzeck@gmail.com Reviewed-by: Tom Rini trini@konsulko.com Reviewed-by: Simon Glass sjg@chromium.org

---

Changes in v4: None Changes in v3: - annotating fixed table with const - fix camel-case in ddr2 timing parameters - fix cmd index parameter of host_load_cmd(). - fix compilation warning

Changes in v2: - move ddr2 initialization from board/microchip/ to drivers/ddr/microchip

arch/mips/mach-pic32/include/mach/ddr.h | 32 ++++ drivers/Makefile | 1 + drivers/ddr/microchip/Makefile | 6 + drivers/ddr/microchip/ddr2.c | 278 ++++++++++++++++++++++++++++++++ drivers/ddr/microchip/ddr2_regs.h | 148 +++++++++++++++++ drivers/ddr/microchip/ddr2_timing.h | 65 ++++++++ 6 files changed, 530 insertions(+) create mode 100644 arch/mips/mach-pic32/include/mach/ddr.h create mode 100644 drivers/ddr/microchip/Makefile create mode 100644 drivers/ddr/microchip/ddr2.c create mode 100644 drivers/ddr/microchip/ddr2_regs.h create mode 100644 drivers/ddr/microchip/ddr2_timing.h

diff --git a/arch/mips/mach-pic32/include/mach/ddr.h b/arch/mips/mach-pic32/include/mach/ddr.h new file mode 100644 index 0000000..00abfa3 --- /dev/null +++ b/arch/mips/mach-pic32/include/mach/ddr.h @@ -0,0 +1,32 @@ +/* + * (c) 2015 Purna Chandra Mandal purna.mandal@microchip.com + * + * SPDX-License-Identifier: GPL-2.0+ + * + */ + +#ifndef __MICROCHIP_PIC32_DDR_H +#define __MICROCHIP_PIC32_DDR_H + +/* called by initdram() function */ +void ddr2_phy_init(void); +void ddr2_ctrl_init(void); +phys_size_t ddr2_calculate_size(void); + +/* Maximum number of agents */ +#define NUM_AGENTS 5 + +/* Board can provide agent specific parameters for arbitration by + * filling struct ddr2_arbiter_params for all the agents and + * implementing board_get_ddr_arbiter_params() to return the filled + * structure. + */ +struct ddr2_arbiter_params { + u32 min_limit; /* min bursts to execute per arbitration */ + u32 req_period; /* request period threshold for accepted cmds */ + u32 min_cmd_acpt; /* min number of accepted cmds */ +}; + +const struct ddr2_arbiter_params *board_get_ddr_arbiter_params(void); + +#endif /* __MICROCHIP_PIC32_DDR_H */ diff --git a/drivers/Makefile b/drivers/Makefile index 6294048..e7eab66 100644 --- a/drivers/Makefile +++ b/drivers/Makefile @@ -69,4 +69,5 @@ obj-y += soc/ obj-$(CONFIG_REMOTEPROC) += remoteproc/ obj-y += thermal/

+obj-$(CONFIG_MACH_PIC32) += ddr/microchip/ endif diff --git a/drivers/ddr/microchip/Makefile b/drivers/ddr/microchip/Makefile new file mode 100644 index 0000000..305c48b --- /dev/null +++ b/drivers/ddr/microchip/Makefile @@ -0,0 +1,6 @@ +# +# Copyright (C) 2015 Microchip Technology Inc. +# +# SPDX-License-Identifier: GPL-2.0+ +# +obj-$(CONFIG_MACH_PIC32) += ddr2.o diff --git a/drivers/ddr/microchip/ddr2.c b/drivers/ddr/microchip/ddr2.c new file mode 100644 index 0000000..6056418 --- /dev/null +++ b/drivers/ddr/microchip/ddr2.c @@ -0,0 +1,278 @@ +/* + * (c) 2015 Paul Thacker paul.thacker@microchip.com + * + * SPDX-License-Identifier: GPL-2.0+ + * + */ +#include <common.h> +#include <wait_bit.h> +#include <linux/kernel.h> +#include <linux/bitops.h> +#include <mach/pic32.h> +#include <mach/ddr.h> + +#include "ddr2_regs.h" +#include "ddr2_timing.h" + +/* init DDR2 Phy */ +void ddr2_phy_init(void) +{ + struct ddr2_phy_regs *ddr2_phy; + u32 pad_ctl; + + ddr2_phy = ioremap(PIC32_DDR2P_BASE, sizeof(*ddr2_phy)); + + /* PHY_DLL_RECALIB */ + writel(DELAY_START_VAL(3) | DISABLE_RECALIB(0) | + RECALIB_CNT(0x10), &ddr2_phy->dll_recalib); + + /* PHY_PAD_CTRL */ + pad_ctl = ODT_SEL | ODT_EN | DRIVE_SEL(0) | + ODT_PULLDOWN(2) | ODT_PULLUP(3) | + EXTRA_OEN_CLK(0) | NOEXT_DLL | + DLR_DFT_WRCMD | HALF_RATE | + DRVSTR_PFET(0xe) | DRVSTR_NFET(0xe) | + RCVR_EN | PREAMBLE_DLY(2); + writel(pad_ctl, &ddr2_phy->pad_ctrl); + + /* SCL_CONFIG_0 */ + writel(SCL_BURST8 | SCL_DDR_CONNECTED | SCL_RCAS_LAT(RL) | + SCL_ODTCSWW, &ddr2_phy->scl_config_1); + + /* SCL_CONFIG_1 */ + writel(SCL_CSEN | SCL_WCAS_LAT(WL), &ddr2_phy->scl_config_2); + + /* SCL_LAT */ + writel(SCL_CAPCLKDLY(3) | SCL_DDRCLKDLY(4), &ddr2_phy->scl_latency); +} + +/* start phy self calibration logic */ +static int ddr2_phy_calib_start(void) +{ + struct ddr2_phy_regs *ddr2_phy; + + ddr2_phy = ioremap(PIC32_DDR2P_BASE, sizeof(*ddr2_phy)); + + /* DDR Phy SCL Start */ + writel(SCL_START | SCL_EN, &ddr2_phy->scl_start); + + /* Wait for SCL for data byte to pass */ + return wait_for_bit(__func__, &ddr2_phy->scl_start, SCL_LUBPASS, + true, CONFIG_SYS_HZ, false); +} + +/* DDR2 Controller initialization */ + +/* Target Agent Arbiter */ +static void ddr_set_arbiter(struct ddr2_ctrl_regs *ctrl, + const struct ddr2_arbiter_params *const param) +{ + int i; + + for (i = 0; i < NUM_AGENTS; i++) { + /* set min burst size */ + writel(i * MIN_LIM_WIDTH, &ctrl->tsel); + writel(param->min_limit, &ctrl->minlim); + + /* set request period (4 * req_period clocks) */ + writel(i * RQST_PERIOD_WIDTH, &ctrl->tsel); + writel(param->req_period, &ctrl->reqprd); + + /* set number of burst accepted */ + writel(i * MIN_CMDACPT_WIDTH, &ctrl->tsel); + writel(param->min_cmd_acpt, &ctrl->mincmd); + } +} + +const struct ddr2_arbiter_params *__weak board_get_ddr_arbiter_params(void) +{ + /* default arbiter parameters */ + static const struct ddr2_arbiter_params arb_params[] = { + { .min_limit = 0x1f, .req_period = 0xff, .min_cmd_acpt = 0x04,}, + { .min_limit = 0x1f, .req_period = 0xff, .min_cmd_acpt = 0x10,}, + { .min_limit = 0x1f, .req_period = 0xff, .min_cmd_acpt = 0x10,}, + { .min_limit = 0x04, .req_period = 0xff, .min_cmd_acpt = 0x04,}, + { .min_limit = 0x04, .req_period = 0xff, .min_cmd_acpt = 0x04,}, + }; + + return &arb_params[0]; +} + +static void host_load_cmd(struct ddr2_ctrl_regs *ctrl, u32 cmd_idx, + u32 hostcmd2, u32 hostcmd1, u32 delay) +{ + u32 hc_delay; + + hc_delay = max_t(u32, DIV_ROUND_UP(delay, T_CK), 2) - 2; + writel(hostcmd1, &ctrl->cmd10[cmd_idx]); + writel((hostcmd2 & 0x7ff) | (hc_delay << 11), &ctrl->cmd20[cmd_idx]); +} + +/* init DDR2 Controller */ +void ddr2_ctrl_init(void) +{ + u32 wr2prech, rd2prech, wr2rd, wr2rd_cs; + u32 ras2ras, ras2cas, prech2ras, temp; + const struct ddr2_arbiter_params *arb_params; + struct ddr2_ctrl_regs *ctrl; + + ctrl = ioremap(PIC32_DDR2C_BASE, sizeof(*ctrl)); + + /* PIC32 DDR2 controller always work in HALF_RATE */ + writel(HALF_RATE_MODE, &ctrl->memwidth); + + /* Set arbiter configuration per target */ + arb_params = board_get_ddr_arbiter_params(); + ddr_set_arbiter(ctrl, arb_params); + + /* Address Configuration, model {CS, ROW, BA, COL} */ + writel((ROW_ADDR_RSHIFT | (BA_RSHFT << 8) | (CS_ADDR_RSHIFT << 16) | + (COL_HI_RSHFT << 24) | (SB_PRI << 29) | + (EN_AUTO_PRECH << 30)), &ctrl->memcfg0); + + writel(ROW_ADDR_MASK, &ctrl->memcfg1); + writel(COL_HI_MASK, &ctrl->memcfg2); + writel(COL_LO_MASK, &ctrl->memcfg3); + writel(BA_MASK | (CS_ADDR_MASK << 8), &ctrl->memcfg4); + + /* Refresh Config */ + writel(REFCNT_CLK(DIV_ROUND_UP(T_RFI, T_CK_CTRL) - 2) | + REFDLY_CLK(DIV_ROUND_UP(T_RFC_MIN, T_CK_CTRL) - 2) | + MAX_PEND_REF(7), + &ctrl->refcfg); + + /* Power Config */ + writel(ECC_EN(0) | ERR_CORR_EN(0) | EN_AUTO_PWR_DN(0) | + EN_AUTO_SELF_REF(3) | PWR_DN_DLY(8) | + SELF_REF_DLY(17) | PRECH_PWR_DN_ONLY(0), + &ctrl->pwrcfg); + + /* Delay Config */ + wr2rd = max_t(u32, DIV_ROUND_UP(T_WTR, T_CK_CTRL), + DIV_ROUND_UP(T_WTR_TCK, 2)) + WL + BL; + wr2rd_cs = max_t(u32, wr2rd - 1, 3); + wr2prech = DIV_ROUND_UP(T_WR, T_CK_CTRL) + WL + BL; + rd2prech = max_t(u32, DIV_ROUND_UP(T_RTP, T_CK_CTRL), + DIV_ROUND_UP(T_RTP_TCK, 2)) + BL - 2; + ras2ras = max_t(u32, DIV_ROUND_UP(T_RRD, T_CK_CTRL), + DIV_ROUND_UP(T_RRD_TCK, 2)) - 1; + ras2cas = DIV_ROUND_UP(T_RCD, T_CK_CTRL) - 1; + prech2ras = DIV_ROUND_UP(T_RP, T_CK_CTRL) - 1; + + writel(((wr2rd & 0x0f) | + ((wr2rd_cs & 0x0f) << 4) | + ((BL - 1) << 8) | + (BL << 12) | + ((BL - 1) << 16) | + ((BL - 1) << 20) | + ((BL + 2) << 24) | + ((RL - WL + 3) << 28)), &ctrl->dlycfg0); + + writel(((T_CKE_TCK - 1) | + (((DIV_ROUND_UP(T_DLLK, 2) - 2) & 0xff) << 8) | + ((T_CKE_TCK - 1) << 16) | + ((max_t(u32, T_XP_TCK, T_CKE_TCK) - 1) << 20) | + ((wr2prech >> 4) << 26) | + ((wr2rd >> 4) << 27) | + ((wr2rd_cs >> 4) << 28) | + (((RL + 5) >> 4) << 29) | + ((DIV_ROUND_UP(T_DLLK, 2) >> 8) << 30)), &ctrl->dlycfg1); + + writel((DIV_ROUND_UP(T_RP, T_CK_CTRL) | + (rd2prech << 8) | + ((wr2prech & 0x0f) << 12) | + (ras2ras << 16) | + (ras2cas << 20) | + (prech2ras << 24) | + ((RL + 3) << 28)), &ctrl->dlycfg2); + + writel(((DIV_ROUND_UP(T_RAS_MIN, T_CK_CTRL) - 1) | + ((DIV_ROUND_UP(T_RC, T_CK_CTRL) - 1) << 8) | + ((DIV_ROUND_UP(T_FAW, T_CK_CTRL) - 1) << 16)), + &ctrl->dlycfg3); + + /* ODT Config */ + writel(0x0, &ctrl->odtcfg); + writel(BIT(16), &ctrl->odtencfg); + writel(ODTRDLY(RL - 3) | ODTWDLY(WL - 3) | ODTRLEN(2) | ODTWLEN(3), + &ctrl->odtcfg); + + /* Transfer Configuration */ + writel(NXTDATRQDLY(2) | NXDATAVDLY(4) | RDATENDLY(2) | + MAX_BURST(3) | (7 << 28) | BIG_ENDIAN(0), + &ctrl->xfercfg); + + /* DRAM Initialization */ + /* CKE high after reset and wait 400 nsec */ + host_load_cmd(ctrl, 0, 0, IDLE_NOP, 400000); + + /* issue precharge all command */ + host_load_cmd(ctrl, 1, 0x04, PRECH_ALL_CMD, T_RP + T_CK); + + /* initialize EMR2 */ + host_load_cmd(ctrl, 2, 0x200, LOAD_MODE_CMD, T_MRD_TCK * T_CK); + + /* initialize EMR3 */ + host_load_cmd(ctrl, 3, 0x300, LOAD_MODE_CMD, T_MRD_TCK * T_CK); + + /* + * RDQS disable, DQSB enable, OCD exit, 150 ohm termination, + * AL=0, DLL enable + */ + host_load_cmd(ctrl, 4, 0x100, + LOAD_MODE_CMD | (0x40 << 24), T_MRD_TCK * T_CK); + /* + * PD fast exit, WR REC = T_WR in clocks -1, + * DLL reset, CAS = RL, burst = 4 + */ + temp = ((DIV_ROUND_UP(T_WR, T_CK) - 1) << 1) | 1; + host_load_cmd(ctrl, 5, temp, LOAD_MODE_CMD | (RL << 28) | (2 << 24), + T_MRD_TCK * T_CK); + + /* issue precharge all command */ + host_load_cmd(ctrl, 6, 4, PRECH_ALL_CMD, T_RP + T_CK); + + /* issue refresh command */ + host_load_cmd(ctrl, 7, 0, REF_CMD, T_RFC_MIN); + + /* issue refresh command */ + host_load_cmd(ctrl, 8, 0, REF_CMD, T_RFC_MIN); + + /* Mode register programming as before without DLL reset */ + host_load_cmd(ctrl, 9, temp, LOAD_MODE_CMD | (RL << 28) | (3 << 24), + T_MRD_TCK * T_CK); + + /* extended mode register same as before with OCD default */ + host_load_cmd(ctrl, 10, 0x103, LOAD_MODE_CMD | (0xc << 24), + T_MRD_TCK * T_CK); + + /* extended mode register same as before with OCD exit */ + host_load_cmd(ctrl, 11, 0x100, LOAD_MODE_CMD | (0x4 << 28), + 140 * T_CK); + + writel(CMD_VALID | NUMHOSTCMD(11), &ctrl->cmdissue); + + /* start memory initialization */ + writel(INIT_START, &ctrl->memcon); + + /* wait for all host cmds to be transmitted */ + wait_for_bit(__func__, &ctrl->cmdissue, CMD_VALID, false, + CONFIG_SYS_HZ, false); + + /* inform all cmds issued, ready for normal operation */ + writel(INIT_START | INIT_DONE, &ctrl->memcon); + + /* perform phy caliberation */ + if (ddr2_phy_calib_start()) + printf("ddr2: phy calib failed\n"); +} + +phys_size_t ddr2_calculate_size(void) +{ + u32 temp; + + temp = 1 << (COL_BITS + BA_BITS + ROW_BITS); + /* 16-bit data width between controller and DIMM */ + temp = temp * CS_BITS * (16 / 8); + return (phys_size_t)temp; +} diff --git a/drivers/ddr/microchip/ddr2_regs.h b/drivers/ddr/microchip/ddr2_regs.h new file mode 100644 index 0000000..0f4b159 --- /dev/null +++ b/drivers/ddr/microchip/ddr2_regs.h @@ -0,0 +1,148 @@ +/* + * (c) 2015 Purna Chandra Mandal purna.mandal@microchip.com + * + * SPDX-License-Identifier: GPL-2.0+ + * + */ + +#ifndef __MICROCHIP_DDR2_REGS_H +#define __MICROCHIP_DDR2_REGS_H + +#include <linux/bitops.h> + +/* DDR2 Controller */ +struct ddr2_ctrl_regs { + u32 tsel; + u32 minlim; + u32 reqprd; + u32 mincmd; + u32 memcon; + u32 memcfg0; + u32 memcfg1; + u32 memcfg2; + u32 memcfg3; + u32 memcfg4; + u32 refcfg; + u32 pwrcfg; + u32 dlycfg0; + u32 dlycfg1; + u32 dlycfg2; + u32 dlycfg3; + u32 odtcfg; + u32 xfercfg; + u32 cmdissue; + u32 odtencfg; + u32 memwidth; + u32 unused[11]; + u32 cmd10[16]; + u32 cmd20[16]; +}; + +/* Arbiter Config */ +#define MIN_LIM_WIDTH 5 +#define RQST_PERIOD_WIDTH 8 +#define MIN_CMDACPT_WIDTH 8 + +/* Refresh Config */ +#define REFCNT_CLK(x) (x) +#define REFDLY_CLK(x) ((x) << 16) +#define MAX_PEND_REF(x) ((x) << 24) + +/* Power Config */ +#define PRECH_PWR_DN_ONLY(x) ((x) << 22) +#define SELF_REF_DLY(x) ((x) << 12) +#define PWR_DN_DLY(x) ((x) << 4) +#define EN_AUTO_SELF_REF(x) ((x) << 3) +#define EN_AUTO_PWR_DN(x) ((x) << 2) +#define ERR_CORR_EN(x) ((x) << 1) +#define ECC_EN(x) (x) + +/* Memory Width */ +#define HALF_RATE_MODE BIT(3) + +/* Delay Config */ +#define ODTWLEN(x) ((x) << 20) +#define ODTRLEN(x) ((x) << 16) +#define ODTWDLY(x) ((x) << 12) +#define ODTRDLY(x) ((x) << 8) + +/* Xfer Config */ +#define BIG_ENDIAN(x) ((x) << 31) +#define MAX_BURST(x) ((x) << 24) +#define RDATENDLY(x) ((x) << 16) +#define NXDATAVDLY(x) ((x) << 4) +#define NXTDATRQDLY(x) ((x) << 0) + +/* Host Commands */ +#define IDLE_NOP 0x00ffffff +#define PRECH_ALL_CMD 0x00fff401 +#define REF_CMD 0x00fff801 +#define LOAD_MODE_CMD 0x00fff001 +#define CKE_LOW 0x00ffeffe + +#define NUM_HOST_CMDS 12 + +/* Host CMD Issue */ +#define CMD_VALID BIT(4) +#define NUMHOSTCMD(x) (x) + +/* Memory Control */ +#define INIT_DONE BIT(1) +#define INIT_START BIT(0) + +/* Address Control */ +#define EN_AUTO_PRECH 0 +#define SB_PRI 1 + +/* DDR2 Phy Register */ +struct ddr2_phy_regs { + u32 scl_start; + u32 unused1[2]; + u32 scl_latency; + u32 unused2[2]; + u32 scl_config_1; + u32 scl_config_2; + u32 pad_ctrl; + u32 dll_recalib; +}; + +/* PHY PAD CONTROL */ +#define ODT_SEL BIT(0) +#define ODT_EN BIT(1) +#define DRIVE_SEL(x) ((x) << 2) +#define ODT_PULLDOWN(x) ((x) << 4) +#define ODT_PULLUP(x) ((x) << 6) +#define EXTRA_OEN_CLK(x) ((x) << 8) +#define NOEXT_DLL BIT(9) +#define DLR_DFT_WRCMD BIT(13) +#define HALF_RATE BIT(14) +#define DRVSTR_PFET(x) ((x) << 16) +#define DRVSTR_NFET(x) ((x) << 20) +#define RCVR_EN BIT(28) +#define PREAMBLE_DLY(x) ((x) << 29) + +/* PHY DLL RECALIBRATE */ +#define RECALIB_CNT(x) ((x) << 8) +#define DISABLE_RECALIB(x) ((x) << 26) +#define DELAY_START_VAL(x) ((x) << 28) + +/* PHY SCL CONFIG1 */ +#define SCL_BURST8 BIT(0) +#define SCL_DDR_CONNECTED BIT(1) +#define SCL_RCAS_LAT(x) ((x) << 4) +#define SCL_ODTCSWW BIT(24) + +/* PHY SCL CONFIG2 */ +#define SCL_CSEN BIT(0) +#define SCL_WCAS_LAT(x) ((x) << 8) + +/* PHY SCL Latency */ +#define SCL_CAPCLKDLY(x) ((x) << 0) +#define SCL_DDRCLKDLY(x) ((x) << 4) + +/* PHY SCL START */ +#define SCL_START BIT(28) +#define SCL_EN BIT(26) +#define SCL_LUBPASS (BIT(1) | BIT(0)) + +#endif /* __MICROCHIP_DDR2_REGS_H */ diff --git a/drivers/ddr/microchip/ddr2_timing.h b/drivers/ddr/microchip/ddr2_timing.h new file mode 100644 index 0000000..5895f9d --- /dev/null +++ b/drivers/ddr/microchip/ddr2_timing.h @@ -0,0 +1,65 @@ +/* + * (c) 2015 Purna Chandra Mandal purna.mandal@microchip.com + * + * SPDX-License-Identifier: GPL-2.0+ + * + */ + +#ifndef __MICROCHIP_DDR2_TIMING_H +#define __MICROCHIP_DDR2_TIMING_H + +/* MPLL freq is 400MHz */ +#define T_CK 2500 /* 2500 psec */ +#define T_CK_CTRL (T_CK * 2) + +/* Burst length in cycles */ +#define BL 2 +/* default CAS latency for all speed grades */ +#define RL 5 +/* default write latency for all speed grades = CL-1 */ +#define WL 4 + +/* From Micron MT47H64M16HR-3 data sheet */ +#define T_RFC_MIN 127500 /* psec */ +#define T_WR 15000 /* psec */ +#define T_RP 12500 /* psec */ +#define T_RCD 12500 /* psec */ +#define T_RRD 7500 /* psec */ +/* T_RRD_TCK is minimum of 2 clk periods, regardless of freq */ +#define T_RRD_TCK 2 +#define T_WTR 7500 /* psec */ +/* T_WTR_TCK is minimum of 2 clk periods, regardless of freq */ +#define T_WTR_TCK 2 +#define T_RTP 7500 /* psec */ +#define T_RTP_TCK (BL / 2) +#define T_XP_TCK 2 /* clocks */ +#define T_CKE_TCK 3 /* clocks */ +#define T_XSNR (T_RFC_MIN + 10000) /* psec */ +#define T_DLLK 200 /* clocks */ +#define T_RAS_MIN 45000 /* psec */ +#define T_RC 57500 /* psec */ +#define T_FAW 35000 /* psec */ +#define T_MRD_TCK 2 /* clocks */ +#define T_RFI 7800000 /* psec */ + +/* DDR Addressing */ +#define COL_BITS 10 +#define BA_BITS 3 +#define ROW_BITS 13 +#define CS_BITS 1 + +/* DDR Addressing scheme: {CS, ROW, BA, COL} */ +#define COL_HI_RSHFT 0 +#define COL_HI_MASK 0 +#define COL_LO_MASK ((1 << COL_BITS) - 1) + +#define BA_RSHFT COL_BITS +#define BA_MASK ((1 << BA_BITS) - 1) + +#define ROW_ADDR_RSHIFT (BA_RSHFT + BA_BITS) +#define ROW_ADDR_MASK ((1 << ROW_BITS) - 1) + +#define CS_ADDR_RSHIFT 0 +#define CS_ADDR_MASK 0 + +#endif /* __MICROCHIP_DDR2_TIMING_H */

From: Andrei Pistirica andrei.pistirica@microchip.com

This driver implements platform specific glue and fixups for PIC32 internal SDHCI controller.

Signed-off-by: Andrei Pistirica andrei.pistirica@microchip.com Signed-off-by: Sandeep Sheriker Mallikarjun sandeepsheriker.mallikarjun@microchip.com Signed-off-by: Purna Chandra Mandal purna.mandal@microchip.com Reviewed-by: Tom Rini trini@konsulko.com Reviewed-by: Daniel Schwierzeck daniel.schwierzeck@gmail.com

---

Changes in v4: - update Kconfig help message - add CD errata under SDHCI_QUIRK_NO_CD

Changes in v3: - remove ofdata_to_platdata, and replace platdata with priv - replace pic32_ioremap() with ioremap()

Changes in v2: - drop sdhci shared bus configuration (for shared interrupt, clock pins)

drivers/mmc/Kconfig | 6 +++++ drivers/mmc/Makefile | 2 +- drivers/mmc/pic32_sdhci.c | 58 +++++++++++++++++++++++++++++++++++++++++++++++ drivers/mmc/sdhci.c | 7 ++++++ 4 files changed, 72 insertions(+), 1 deletion(-) create mode 100644 drivers/mmc/pic32_sdhci.c

diff --git a/drivers/mmc/Kconfig b/drivers/mmc/Kconfig index ceae7bc..9f4b766 100644 --- a/drivers/mmc/Kconfig +++ b/drivers/mmc/Kconfig @@ -31,4 +31,10 @@ config SH_SDHI help Support for the on-chip SDHI host controller on SuperH/Renesas ARM SoCs platform

+config PIC32_SDHCI + bool "Microchip PIC32 on-chip SDHCI support" + depends on DM_MMC && MACH_PIC32 + help + Support for Microchip PIC32 SDHCI controller. + endmenu diff --git a/drivers/mmc/Makefile b/drivers/mmc/Makefile index 5d35705..c9c3e3e 100644 --- a/drivers/mmc/Makefile +++ b/drivers/mmc/Makefile @@ -48,4 +48,4 @@ obj-$(CONFIG_SPL_MMC_BOOT) += fsl_esdhc_spl.o else obj-$(CONFIG_GENERIC_MMC) += mmc_write.o endif - +obj-$(CONFIG_PIC32_SDHCI) += pic32_sdhci.o diff --git a/drivers/mmc/pic32_sdhci.c b/drivers/mmc/pic32_sdhci.c new file mode 100644 index 0000000..28da55d --- /dev/null +++ b/drivers/mmc/pic32_sdhci.c @@ -0,0 +1,58 @@ +/* + * Support of SDHCI for Microchip PIC32 SoC. + * + * Copyright (C) 2015 Microchip Technology Inc. + * Andrei Pistirica andrei.pistirica@microchip.com + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <dm.h> +#include <common.h> +#include <sdhci.h> +#include <asm/errno.h> +#include <mach/pic32.h> + +DECLARE_GLOBAL_DATA_PTR; + +static int pic32_sdhci_probe(struct udevice *dev) +{ + struct sdhci_host *host = dev_get_priv(dev); + const void *fdt = gd->fdt_blob; + u32 f_min_max[2]; + fdt_addr_t addr; + fdt_size_t size; + int ret; + + addr = fdtdec_get_addr_size(fdt, dev->of_offset, "reg", &size); + if (addr == FDT_ADDR_T_NONE) + return -EINVAL; + + host->ioaddr = ioremap(addr, size); + host->name = (char *)dev->name; + host->quirks = SDHCI_QUIRK_NO_HISPD_BIT | SDHCI_QUIRK_NO_CD; + host->bus_width = fdtdec_get_int(gd->fdt_blob, dev->of_offset, + "bus-width", 4); + + ret = fdtdec_get_int_array(gd->fdt_blob, dev->of_offset, + "clock-freq-min-max", f_min_max, 2); + if (ret) { + printf("sdhci: clock-freq-min-max not found\n"); + return ret; + } + + return add_sdhci(host, f_min_max[1], f_min_max[0]); +} + +static const struct udevice_id pic32_sdhci_ids[] = { + { .compatible = "microchip,pic32mzda-sdhci" }, + { } +}; + +U_BOOT_DRIVER(pic32_sdhci_drv) = { + .name = "pic32_sdhci", + .id = UCLASS_MMC, + .of_match = pic32_sdhci_ids, + .probe = pic32_sdhci_probe, + .priv_auto_alloc_size = sizeof(struct sdhci_host), +}; diff --git a/drivers/mmc/sdhci.c b/drivers/mmc/sdhci.c index 02d71b9..f77b707 100644 --- a/drivers/mmc/sdhci.c +++ b/drivers/mmc/sdhci.c @@ -443,6 +443,12 @@ static int sdhci_init(struct mmc *mmc) sdhci_set_power(host, fls(mmc->cfg->voltages) - 1);

if (host->quirks & SDHCI_QUIRK_NO_CD) { +#if defined(CONFIG_PIC32_SDHCI) + /* PIC32 SDHCI CD errata: + * - set CD_TEST and clear CD_TEST_INS bit + */ + sdhci_writeb(host, SDHCI_CTRL_CD_TEST, SDHCI_HOST_CONTROL); +#else unsigned int status;

sdhci_writeb(host, SDHCI_CTRL_CD_TEST_INS | SDHCI_CTRL_CD_TEST, @@ -453,6 +459,7 @@ static int sdhci_init(struct mmc *mmc) (!(status & SDHCI_CARD_STATE_STABLE)) || (!(status & SDHCI_CARD_DETECT_PIN_LEVEL))) status = sdhci_readl(host, SDHCI_PRESENT_STATE); +#endif }

/* Enable only interrupts served by the SD controller */

Add SMSC LAN8740 Phy support required for PIC32MZDA devices.

Signed-off-by: Purna Chandra Mandal purna.mandal@microchip.com Reviewed-by: Tom Rini trini@konsulko.com Reviewed-by: Daniel Schwierzeck daniel.schwierzeck@gmail.com

---

Changes in v4: None Changes in v3: None Changes in v2: None

drivers/net/phy/smsc.c | 10 ++++++++++ 1 file changed, 10 insertions(+)

diff --git a/drivers/net/phy/smsc.c b/drivers/net/phy/smsc.c index bfd9815..34986a2 100644 --- a/drivers/net/phy/smsc.c +++ b/drivers/net/phy/smsc.c @@ -69,11 +69,21 @@ static struct phy_driver lan8710_driver = { .shutdown = &genphy_shutdown, };

+static struct phy_driver lan8740_driver = { + .name = "SMSC LAN8740", + .uid = 0x0007c110, + .mask = 0xffff0, + .features = PHY_BASIC_FEATURES, + .config = &genphy_config_aneg, + .startup = &genphy_startup, + .shutdown = &genphy_shutdown, +}; int phy_smsc_init(void) { phy_register(&lan8710_driver); phy_register(&lan911x_driver); phy_register(&lan8700_driver); + phy_register(&lan8740_driver);

return 0; }

This driver implements MAC and MII layer of the ethernet controller. Network data transfer is handled by controller internal DMA engine. Ethernet controller is configurable through device-tree file.

Signed-off-by: Purna Chandra Mandal purna.mandal@microchip.com

---

Changes in v4: - drop ioremap() success check - drop _dcache_flush/invalidate() helpers for flash/invalidate_dcache_range().

Changes in v3: - merge wrappers with eth operation callbacks - read phy address from device-tree - rename functions (e.g. _eth_xyz() with pic32_eth_xyz())

Changes in v2: None

drivers/net/Kconfig | 8 + drivers/net/Makefile | 1 + drivers/net/pic32_eth.c | 605 +++++++++++++++++++++++++++++++++++++++++++++++ drivers/net/pic32_eth.h | 164 +++++++++++++ drivers/net/pic32_mdio.c | 121 ++++++++++ 5 files changed, 899 insertions(+) create mode 100644 drivers/net/pic32_eth.c create mode 100644 drivers/net/pic32_eth.h create mode 100644 drivers/net/pic32_mdio.c

diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig index de54ca8..1502f8e 100644 --- a/drivers/net/Kconfig +++ b/drivers/net/Kconfig @@ -109,4 +109,12 @@ config ZYNQ_GEM help This MAC is present in Xilinx Zynq and ZynqMP SoCs.

+config PIC32_ETH + bool "Microchip PIC32 Ethernet Support" + depends on DM_ETH && MACH_PIC32 + select PHYLIB + help + This driver implements 10/100 Mbps Ethernet and MAC layer for + Microchip PIC32 microcontrollers. + endif # NETDEVICES diff --git a/drivers/net/Makefile b/drivers/net/Makefile index 150470c..33a81ee 100644 --- a/drivers/net/Makefile +++ b/drivers/net/Makefile @@ -72,3 +72,4 @@ obj-$(CONFIG_FSL_MC_ENET) += fsl-mc/ obj-$(CONFIG_FSL_MC_ENET) += ldpaa_eth/ obj-$(CONFIG_FSL_MEMAC) += fm/memac_phy.o obj-$(CONFIG_VSC9953) += vsc9953.o +obj-$(CONFIG_PIC32_ETH) += pic32_mdio.o pic32_eth.o diff --git a/drivers/net/pic32_eth.c b/drivers/net/pic32_eth.c new file mode 100644 index 0000000..167af8b --- /dev/null +++ b/drivers/net/pic32_eth.c @@ -0,0 +1,605 @@ +/* + * (c) 2015 Purna Chandra Mandal purna.mandal@microchip.com + * + * SPDX-License-Identifier: GPL-2.0+ + * + */ +#include <common.h> +#include <errno.h> +#include <dm.h> +#include <net.h> +#include <miiphy.h> +#include <console.h> +#include <wait_bit.h> +#include <asm/gpio.h> + +#include "pic32_eth.h" + +#define MAX_RX_BUF_SIZE 1536 +#define MAX_RX_DESCR PKTBUFSRX +#define MAX_TX_DESCR 2 + +DECLARE_GLOBAL_DATA_PTR; + +struct pic32eth_dev { + struct eth_dma_desc rxd_ring[MAX_RX_DESCR]; + struct eth_dma_desc txd_ring[MAX_TX_DESCR]; + u32 rxd_idx; /* index of RX desc to read */ + /* regs */ + struct pic32_ectl_regs *ectl_regs; + struct pic32_emac_regs *emac_regs; + /* Phy */ + struct phy_device *phydev; + phy_interface_t phyif; + u32 phy_addr; + struct gpio_desc rst_gpio; +}; + +void __weak board_netphy_reset(void *dev) +{ + struct pic32eth_dev *priv = dev; + + if (!dm_gpio_is_valid(&priv->rst_gpio)) + return; + + /* phy reset */ + dm_gpio_set_value(&priv->rst_gpio, 0); + udelay(300); + dm_gpio_set_value(&priv->rst_gpio, 1); + udelay(300); +} + +/* Initialize mii(MDIO) interface, discover which PHY is + * attached to the device, and configure it properly. + */ +static int pic32_mii_init(struct pic32eth_dev *priv) +{ + struct pic32_ectl_regs *ectl_p = priv->ectl_regs; + struct pic32_emac_regs *emac_p = priv->emac_regs; + + /* board phy reset */ + board_netphy_reset(priv); + + /* disable RX, TX & all transactions */ + writel(ETHCON_ON | ETHCON_TXRTS | ETHCON_RXEN, &ectl_p->con1.clr); + + /* wait till busy */ + wait_for_bit(__func__, &ectl_p->stat.raw, ETHSTAT_BUSY, false, + CONFIG_SYS_HZ, false); + + /* turn controller ON to access PHY over MII */ + writel(ETHCON_ON, &ectl_p->con1.set); + + mdelay(10); + + /* reset MAC */ + writel(EMAC_SOFTRESET, &emac_p->cfg1.set); /* reset assert */ + mdelay(10); + writel(EMAC_SOFTRESET, &emac_p->cfg1.clr); /* reset deassert */ + + /* initialize MDIO/MII */ + if (priv->phyif == PHY_INTERFACE_MODE_RMII) { + writel(EMAC_RMII_RESET, &emac_p->supp.set); + mdelay(10); + writel(EMAC_RMII_RESET, &emac_p->supp.clr); + } + + return pic32_mdio_init(PIC32_MDIO_NAME, (ulong)&emac_p->mii); +} + +static int pic32_phy_init(struct pic32eth_dev *priv, struct udevice *dev) +{ + struct mii_dev *mii; + + mii = miiphy_get_dev_by_name(PIC32_MDIO_NAME); + + /* find & connect PHY */ + priv->phydev = phy_connect(mii, priv->phy_addr, + dev, priv->phyif); + if (!priv->phydev) { + printf("%s: %s: Error, PHY connect\n", __FILE__, __func__); + return 0; + } + + /* Wait for phy to complete reset */ + mdelay(10); + + /* configure supported modes */ + priv->phydev->supported = SUPPORTED_10baseT_Half | + SUPPORTED_10baseT_Full | + SUPPORTED_100baseT_Half | + SUPPORTED_100baseT_Full | + SUPPORTED_Autoneg; + + priv->phydev->advertising = ADVERTISED_10baseT_Half | + ADVERTISED_10baseT_Full | + ADVERTISED_100baseT_Half | + ADVERTISED_100baseT_Full | + ADVERTISED_Autoneg; + + priv->phydev->autoneg = AUTONEG_ENABLE; + + return 0; +} + +/* Configure MAC based on negotiated speed and duplex + * reported by PHY. + */ +static int pic32_mac_adjust_link(struct pic32eth_dev *priv) +{ + struct phy_device *phydev = priv->phydev; + struct pic32_emac_regs *emac_p = priv->emac_regs; + + if (!phydev->link) { + printf("%s: No link.\n", phydev->dev->name); + return -EINVAL; + } + + if (phydev->duplex) { + writel(EMAC_FULLDUP, &emac_p->cfg2.set); + writel(FULLDUP_GAP_TIME, &emac_p->ipgt.raw); + } else { + writel(EMAC_FULLDUP, &emac_p->cfg2.clr); + writel(HALFDUP_GAP_TIME, &emac_p->ipgt.raw); + } + + switch (phydev->speed) { + case SPEED_100: + writel(EMAC_RMII_SPD100, &emac_p->supp.set); + break; + case SPEED_10: + writel(EMAC_RMII_SPD100, &emac_p->supp.clr); + break; + default: + printf("%s: Speed was bad\n", phydev->dev->name); + return -EINVAL; + } + + printf("pic32eth: PHY is %s with %dbase%s, %s\n", + phydev->drv->name, phydev->speed, + (phydev->port == PORT_TP) ? "T" : "X", + (phydev->duplex) ? "full" : "half"); + + return 0; +} + +static void pic32_mac_init(struct pic32eth_dev *priv, u8 *macaddr) +{ + struct pic32_emac_regs *emac_p = priv->emac_regs; + u32 stat = 0, v; + u64 expire; + + v = EMAC_TXPAUSE | EMAC_RXPAUSE | EMAC_RXENABLE; + writel(v, &emac_p->cfg1.raw); + + v = EMAC_EXCESS | EMAC_AUTOPAD | EMAC_PADENABLE | + EMAC_CRCENABLE | EMAC_LENGTHCK | EMAC_FULLDUP; + writel(v, &emac_p->cfg2.raw); + + /* recommended back-to-back inter-packet gap for 10 Mbps half duplex */ + writel(HALFDUP_GAP_TIME, &emac_p->ipgt.raw); + + /* recommended non-back-to-back interpacket gap is 0xc12 */ + writel(0xc12, &emac_p->ipgr.raw); + + /* recommended collision window retry limit is 0x370F */ + writel(0x370f, &emac_p->clrt.raw); + + /* set maximum frame length: allow VLAN tagged frame */ + writel(0x600, &emac_p->maxf.raw); + + /* set the mac address */ + writel(macaddr[0] | (macaddr[1] << 8), &emac_p->sa2.raw); + writel(macaddr[2] | (macaddr[3] << 8), &emac_p->sa1.raw); + writel(macaddr[4] | (macaddr[5] << 8), &emac_p->sa0.raw); + + /* default, enable 10 Mbps operation */ + writel(EMAC_RMII_SPD100, &emac_p->supp.clr); + + /* wait until link status UP or deadline elapsed */ + expire = get_ticks() + get_tbclk() * 2; + for (; get_ticks() < expire;) { + stat = phy_read(priv->phydev, priv->phy_addr, MII_BMSR); + if (stat & BMSR_LSTATUS) + break; + } + + if (!(stat & BMSR_LSTATUS)) + printf("MAC: Link is DOWN!\n"); + + /* delay to stabilize before any tx/rx */ + mdelay(10); +} + +static void pic32_mac_reset(struct pic32eth_dev *priv) +{ + struct pic32_emac_regs *emac_p = priv->emac_regs; + struct mii_dev *mii; + + /* Reset MAC */ + writel(EMAC_SOFTRESET, &emac_p->cfg1.raw); + mdelay(10); + + /* clear reset */ + writel(0, &emac_p->cfg1.raw); + + /* Reset MII */ + mii = priv->phydev->bus; + if (mii && mii->reset) + mii->reset(mii); +} + +/* initializes the MAC and PHY, then establishes a link */ +static void pic32_ctrl_reset(struct pic32eth_dev *priv) +{ + struct pic32_ectl_regs *ectl_p = priv->ectl_regs; + u32 v; + + /* disable RX, TX & any other transactions */ + writel(ETHCON_ON | ETHCON_TXRTS | ETHCON_RXEN, &ectl_p->con1.clr); + + /* wait till busy */ + wait_for_bit(__func__, &ectl_p->stat.raw, ETHSTAT_BUSY, false, + CONFIG_SYS_HZ, false); + /* decrement received buffcnt to zero. */ + while (readl(&ectl_p->stat.raw) & ETHSTAT_BUFCNT) + writel(ETHCON_BUFCDEC, &ectl_p->con1.set); + + /* clear any existing interrupt event */ + writel(0xffffffff, &ectl_p->irq.clr); + + /* clear RX/TX start address */ + writel(0xffffffff, &ectl_p->txst.clr); + writel(0xffffffff, &ectl_p->rxst.clr); + + /* clear the receive filters */ + writel(0x00ff, &ectl_p->rxfc.clr); + + /* set the receive filters + * ETH_FILT_CRC_ERR_REJECT + * ETH_FILT_RUNT_REJECT + * ETH_FILT_UCAST_ACCEPT + * ETH_FILT_MCAST_ACCEPT + * ETH_FILT_BCAST_ACCEPT + */ + v = ETHRXFC_BCEN | ETHRXFC_MCEN | ETHRXFC_UCEN | + ETHRXFC_RUNTEN | ETHRXFC_CRCOKEN; + writel(v, &ectl_p->rxfc.set); + + /* turn controller ON to access PHY over MII */ + writel(ETHCON_ON, &ectl_p->con1.set); +} + +static void pic32_rx_desc_init(struct pic32eth_dev *priv) +{ + struct pic32_ectl_regs *ectl_p = priv->ectl_regs; + struct eth_dma_desc *rxd; + u32 idx, bufsz; + + priv->rxd_idx = 0; + for (idx = 0; idx < MAX_RX_DESCR; idx++) { + rxd = &priv->rxd_ring[idx]; + + /* hw owned */ + rxd->hdr = EDH_NPV | EDH_EOWN | EDH_STICKY; + + /* packet buffer address */ + rxd->data_buff = virt_to_phys(net_rx_packets[idx]); + + /* link to next desc */ + rxd->next_ed = virt_to_phys(rxd + 1); + + /* reset status */ + rxd->stat1 = 0; + rxd->stat2 = 0; + + /* decrement bufcnt */ + writel(ETHCON_BUFCDEC, &ectl_p->con1.set); + } + + /* link last descr to beginning of list */ + rxd->next_ed = virt_to_phys(&priv->rxd_ring[0]); + + /* flush rx ring */ + flush_dcache_range((ulong)priv->rxd_ring, + (ulong)priv->rxd_ring + sizeof(priv->rxd_ring)); + + /* set rx desc-ring start address */ + writel((ulong)virt_to_phys(&priv->rxd_ring[0]), &ectl_p->rxst.raw); + + /* RX Buffer size */ + bufsz = readl(&ectl_p->con2.raw); + bufsz &= ~(ETHCON_RXBUFSZ << ETHCON_RXBUFSZ_SHFT); + bufsz |= ((MAX_RX_BUF_SIZE / 16) << ETHCON_RXBUFSZ_SHFT); + writel(bufsz, &ectl_p->con2.raw); + + /* enable the receiver in hardware which allows hardware + * to DMA received pkts to the descriptor pointer address. + */ + writel(ETHCON_RXEN, &ectl_p->con1.set); +} + +static int pic32_eth_start(struct udevice *dev) +{ + struct eth_pdata *pdata = dev_get_platdata(dev); + struct pic32eth_dev *priv = dev_get_priv(dev); + + /* controller */ + pic32_ctrl_reset(priv); + + /* reset MAC */ + pic32_mac_reset(priv); + + /* configure PHY */ + phy_config(priv->phydev); + + /* initialize MAC */ + pic32_mac_init(priv, &pdata->enetaddr[0]); + + /* init RX descriptor; TX descriptors are handled in xmit */ + pic32_rx_desc_init(priv); + + /* Start up & update link status of PHY */ + phy_startup(priv->phydev); + + /* adjust mac with phy link status */ + return pic32_mac_adjust_link(priv); +} + +static void pic32_eth_stop(struct udevice *dev) +{ + struct pic32eth_dev *priv = dev_get_priv(dev); + struct pic32_ectl_regs *ectl_p = priv->ectl_regs; + struct pic32_emac_regs *emac_p = priv->emac_regs; + + /* Reset the phy if the controller is enabled */ + if (readl(&ectl_p->con1.raw) & ETHCON_ON) + phy_reset(priv->phydev); + + /* Shut down the PHY */ + phy_shutdown(priv->phydev); + + /* Stop rx/tx */ + writel(ETHCON_TXRTS | ETHCON_RXEN, &ectl_p->con1.clr); + mdelay(10); + + /* reset MAC */ + writel(EMAC_SOFTRESET, &emac_p->cfg1.raw); + + /* clear reset */ + writel(0, &emac_p->cfg1.raw); + mdelay(10); + + /* disable controller */ + writel(ETHCON_ON, &ectl_p->con1.clr); + mdelay(10); + + /* wait until everything is down */ + wait_for_bit(__func__, &ectl_p->stat.raw, ETHSTAT_BUSY, false, + 2 * CONFIG_SYS_HZ, false); + + /* clear any existing interrupt event */ + writel(0xffffffff, &ectl_p->irq.clr); +} + +static int pic32_eth_send(struct udevice *dev, void *packet, int length) +{ + struct pic32eth_dev *priv = dev_get_priv(dev); + struct pic32_ectl_regs *ectl_p = priv->ectl_regs; + struct eth_dma_desc *txd; + u64 deadline; + + txd = &priv->txd_ring[0]; + + /* set proper flags & length in descriptor header */ + txd->hdr = EDH_SOP | EDH_EOP | EDH_EOWN | EDH_BCOUNT(length); + + /* pass buffer address to hardware */ + txd->data_buff = virt_to_phys(packet); + + debug("%s: %d / .hdr %x, .data_buff %x, .stat %x, .nexted %x\n", + __func__, __LINE__, txd->hdr, txd->data_buff, txd->stat2, + txd->next_ed); + + /* cache flush (packet) */ + flush_dcache_range((ulong)packet, (ulong)packet + length); + + /* cache flush (txd) */ + flush_dcache_range((ulong)txd, (ulong)txd + sizeof(*txd)); + + /* pass descriptor table base to h/w */ + writel(virt_to_phys(txd), &ectl_p->txst.raw); + + /* ready to send enabled, hardware can now send the packet(s) */ + writel(ETHCON_TXRTS | ETHCON_ON, &ectl_p->con1.set); + + /* wait until tx has completed and h/w has released ownership + * of the tx descriptor or timeout elapsed. + */ + deadline = get_ticks() + get_tbclk(); + for (;;) { + /* check timeout */ + if (get_ticks() > deadline) + return -ETIMEDOUT; + + if (ctrlc()) + return -EINTR; + + /* tx completed ? */ + if (readl(&ectl_p->con1.raw) & ETHCON_TXRTS) { + udelay(1); + continue; + } + + /* h/w not released ownership yet? */ + invalidate_dcache_range((ulong)txd, (ulong)txd + sizeof(*txd)); + if (!(txd->hdr & EDH_EOWN)) + break; + } + + return 0; +} + +static int pic32_eth_recv(struct udevice *dev, int flags, uchar **packetp) +{ + struct pic32eth_dev *priv = dev_get_priv(dev); + struct eth_dma_desc *rxd; + u32 idx = priv->rxd_idx; + u32 rx_count; + + /* find the next ready to receive */ + rxd = &priv->rxd_ring[idx]; + + invalidate_dcache_range((ulong)rxd, (ulong)rxd + sizeof(*rxd)); + /* check if owned by MAC */ + if (rxd->hdr & EDH_EOWN) + return -EAGAIN; + + /* Sanity check on header: SOP and EOP */ + if ((rxd->hdr & (EDH_SOP | EDH_EOP)) != (EDH_SOP | EDH_EOP)) { + printf("%s: %s, rx pkt across multiple descr\n", + __FILE__, __func__); + return 0; + } + + debug("%s: %d /idx %i, hdr=%x, data_buff %x, stat %x, nexted %x\n", + __func__, __LINE__, idx, rxd->hdr, + rxd->data_buff, rxd->stat2, rxd->next_ed); + + /* Sanity check on rx_stat: OK, CRC */ + if (!RSV_RX_OK(rxd->stat2) || RSV_CRC_ERR(rxd->stat2)) { + debug("%s: %s: Error, rx problem detected\n", + __FILE__, __func__); + return 0; + } + + /* invalidate dcache */ + rx_count = RSV_RX_COUNT(rxd->stat2); + invalidate_dcache_range((ulong)net_rx_packets[idx], + (ulong)net_rx_packets[idx] + rx_count); + + /* Pass the packet to protocol layer */ + *packetp = net_rx_packets[idx]; + + /* increment number of bytes rcvd (ignore CRC) */ + return rx_count - 4; +} + +static int pic32_eth_free_pkt(struct udevice *dev, uchar *packet, int length) +{ + struct pic32eth_dev *priv = dev_get_priv(dev); + struct pic32_ectl_regs *ectl_p = priv->ectl_regs; + struct eth_dma_desc *rxd; + int idx = priv->rxd_idx; + + /* sanity check */ + if (packet != net_rx_packets[idx]) { + printf("rxd_id %d: packet is not matched,\n", idx); + return -EAGAIN; + } + + /* prepare for receive */ + rxd = &priv->rxd_ring[idx]; + rxd->hdr = EDH_STICKY | EDH_NPV | EDH_EOWN; + + flush_dcache_range((ulong)rxd, (ulong)rxd + sizeof(*rxd)); + + /* decrement rx pkt count */ + writel(ETHCON_BUFCDEC, &ectl_p->con1.set); + + debug("%s: %d / idx %i, hdr %x, data_buff %x, stat %x, nexted %x\n", + __func__, __LINE__, idx, rxd->hdr, rxd->data_buff, + rxd->stat2, rxd->next_ed); + + priv->rxd_idx = (priv->rxd_idx + 1) % MAX_RX_DESCR; + + return 0; +} + +static const struct eth_ops pic32_eth_ops = { + .start = pic32_eth_start, + .send = pic32_eth_send, + .recv = pic32_eth_recv, + .free_pkt = pic32_eth_free_pkt, + .stop = pic32_eth_stop, +}; + +static int pic32_eth_probe(struct udevice *dev) +{ + struct eth_pdata *pdata = dev_get_platdata(dev); + struct pic32eth_dev *priv = dev_get_priv(dev); + const char *phy_mode; + void __iomem *iobase; + fdt_addr_t addr; + fdt_size_t size; + int offset = 0; + int phy_addr = -1; + + addr = fdtdec_get_addr_size(gd->fdt_blob, dev->of_offset, "reg", &size); + if (addr == FDT_ADDR_T_NONE) + return -EINVAL; + + iobase = ioremap(addr, size); + pdata->iobase = (phys_addr_t)addr; + + /* get phy mode */ + pdata->phy_interface = -1; + phy_mode = fdt_getprop(gd->fdt_blob, dev->of_offset, "phy-mode", NULL); + if (phy_mode) + pdata->phy_interface = phy_get_interface_by_name(phy_mode); + if (pdata->phy_interface == -1) { + debug("%s: Invalid PHY interface '%s'\n", __func__, phy_mode); + return -EINVAL; + } + + /* get phy addr */ + offset = fdtdec_lookup_phandle(gd->fdt_blob, dev->of_offset, + "phy-handle"); + if (offset > 0) + phy_addr = fdtdec_get_int(gd->fdt_blob, offset, "reg", -1); + + /* phy reset gpio */ + gpio_request_by_name_nodev(gd->fdt_blob, dev->of_offset, + "reset-gpios", 0, + &priv->rst_gpio, GPIOD_IS_OUT); + + priv->phyif = pdata->phy_interface; + priv->phy_addr = phy_addr; + priv->ectl_regs = iobase; + priv->emac_regs = iobase + PIC32_EMAC1CFG1; + + pic32_mii_init(priv); + + return pic32_phy_init(priv, dev); +} + +static int pic32_eth_remove(struct udevice *dev) +{ + struct pic32eth_dev *priv = dev_get_priv(dev); + struct mii_dev *bus; + + dm_gpio_free(dev, &priv->rst_gpio); + phy_shutdown(priv->phydev); + free(priv->phydev); + bus = miiphy_get_dev_by_name(PIC32_MDIO_NAME); + mdio_unregister(bus); + mdio_free(bus); + iounmap(priv->ectl_regs); + return 0; +} + +static const struct udevice_id pic32_eth_ids[] = { + { .compatible = "microchip,pic32mzda-eth" }, + { } +}; + +U_BOOT_DRIVER(pic32_ethernet) = { + .name = "pic32_ethernet", + .id = UCLASS_ETH, + .of_match = pic32_eth_ids, + .probe = pic32_eth_probe, + .remove = pic32_eth_remove, + .ops = &pic32_eth_ops, + .priv_auto_alloc_size = sizeof(struct pic32eth_dev), + .platdata_auto_alloc_size = sizeof(struct eth_pdata), +}; diff --git a/drivers/net/pic32_eth.h b/drivers/net/pic32_eth.h new file mode 100644 index 0000000..be2a187 --- /dev/null +++ b/drivers/net/pic32_eth.h @@ -0,0 +1,164 @@ +/* + * (c) 2015 Purna Chandra Mandal purna.mandal@microchip.com + * + * SPDX-License-Identifier: GPL-2.0+ + * + */ + +#ifndef __MICROCHIP_PIC32_ETH_H_ +#define __MICROCHIP_PIC32_ETH_H_ + +#include <mach/pic32.h> + +/* Ethernet */ +struct pic32_ectl_regs { + struct pic32_reg_atomic con1; /* 0x00 */ + struct pic32_reg_atomic con2; /* 0x10 */ + struct pic32_reg_atomic txst; /* 0x20 */ + struct pic32_reg_atomic rxst; /* 0x30 */ + struct pic32_reg_atomic ht0; /* 0x40 */ + struct pic32_reg_atomic ht1; /* 0x50 */ + struct pic32_reg_atomic pmm0; /* 0x60 */ + struct pic32_reg_atomic pmm1; /* 0x70 */ + struct pic32_reg_atomic pmcs; /* 0x80 */ + struct pic32_reg_atomic pmo; /* 0x90 */ + struct pic32_reg_atomic rxfc; /* 0xa0 */ + struct pic32_reg_atomic rxwm; /* 0xb0 */ + struct pic32_reg_atomic ien; /* 0xc0 */ + struct pic32_reg_atomic irq; /* 0xd0 */ + struct pic32_reg_atomic stat; /* 0xe0 */ +}; + +struct pic32_mii_regs { + struct pic32_reg_atomic mcfg; /* 0x280 */ + struct pic32_reg_atomic mcmd; /* 0x290 */ + struct pic32_reg_atomic madr; /* 0x2a0 */ + struct pic32_reg_atomic mwtd; /* 0x2b0 */ + struct pic32_reg_atomic mrdd; /* 0x2c0 */ + struct pic32_reg_atomic mind; /* 0x2d0 */ +}; + +struct pic32_emac_regs { + struct pic32_reg_atomic cfg1; /* 0x200*/ + struct pic32_reg_atomic cfg2; /* 0x210*/ + struct pic32_reg_atomic ipgt; /* 0x220*/ + struct pic32_reg_atomic ipgr; /* 0x230*/ + struct pic32_reg_atomic clrt; /* 0x240*/ + struct pic32_reg_atomic maxf; /* 0x250*/ + struct pic32_reg_atomic supp; /* 0x260*/ + struct pic32_reg_atomic test; /* 0x270*/ + struct pic32_mii_regs mii; /* 0x280 - 0x2d0 */ + struct pic32_reg_atomic res1; /* 0x2e0 */ + struct pic32_reg_atomic res2; /* 0x2f0 */ + struct pic32_reg_atomic sa0; /* 0x300 */ + struct pic32_reg_atomic sa1; /* 0x310 */ + struct pic32_reg_atomic sa2; /* 0x320 */ +}; + +/* ETHCON1 Reg field */ +#define ETHCON_BUFCDEC BIT(0) +#define ETHCON_RXEN BIT(8) +#define ETHCON_TXRTS BIT(9) +#define ETHCON_ON BIT(15) + +/* ETHCON2 Reg field */ +#define ETHCON_RXBUFSZ 0x7f +#define ETHCON_RXBUFSZ_SHFT 0x4 + +/* ETHSTAT Reg field */ +#define ETHSTAT_BUSY BIT(7) +#define ETHSTAT_BUFCNT 0x00ff0000 + +/* ETHRXFC Register fields */ +#define ETHRXFC_BCEN BIT(0) +#define ETHRXFC_MCEN BIT(1) +#define ETHRXFC_UCEN BIT(3) +#define ETHRXFC_RUNTEN BIT(4) +#define ETHRXFC_CRCOKEN BIT(5) + +/* EMAC1CFG1 register offset */ +#define PIC32_EMAC1CFG1 0x0200 + +/* EMAC1CFG1 register fields */ +#define EMAC_RXENABLE BIT(0) +#define EMAC_RXPAUSE BIT(2) +#define EMAC_TXPAUSE BIT(3) +#define EMAC_SOFTRESET BIT(15) + +/* EMAC1CFG2 register fields */ +#define EMAC_FULLDUP BIT(0) +#define EMAC_LENGTHCK BIT(1) +#define EMAC_CRCENABLE BIT(4) +#define EMAC_PADENABLE BIT(5) +#define EMAC_AUTOPAD BIT(7) +#define EMAC_EXCESS BIT(14) + +/* EMAC1IPGT register magic */ +#define FULLDUP_GAP_TIME 0x15 +#define HALFDUP_GAP_TIME 0x12 + +/* EMAC1SUPP register fields */ +#define EMAC_RMII_SPD100 BIT(8) +#define EMAC_RMII_RESET BIT(11) + +/* MII Management Configuration Register */ +#define MIIMCFG_RSTMGMT BIT(15) +#define MIIMCFG_CLKSEL_DIV40 0x0020 /* 100Mhz / 40 */ + +/* MII Management Command Register */ +#define MIIMCMD_READ BIT(0) +#define MIIMCMD_SCAN BIT(1) + +/* MII Management Address Register */ +#define MIIMADD_REGADDR 0x1f +#define MIIMADD_REGADDR_SHIFT 0 +#define MIIMADD_PHYADDR_SHIFT 8 + +/* MII Management Indicator Register */ +#define MIIMIND_BUSY BIT(0) +#define MIIMIND_NOTVALID BIT(2) +#define MIIMIND_LINKFAIL BIT(3) + +/* Packet Descriptor */ +/* Received Packet Status */ +#define _RSV1_PKT_CSUM 0xffff +#define _RSV2_CRC_ERR BIT(20) +#define _RSV2_LEN_ERR BIT(21) +#define _RSV2_RX_OK BIT(23) +#define _RSV2_RX_COUNT 0xffff + +#define RSV_RX_CSUM(__rsv1) ((__rsv1) & _RSV1_PKT_CSUM) +#define RSV_RX_COUNT(__rsv2) ((__rsv2) & _RSV2_RX_COUNT) +#define RSV_RX_OK(__rsv2) ((__rsv2) & _RSV2_RX_OK) +#define RSV_CRC_ERR(__rsv2) ((__rsv2) & _RSV2_CRC_ERR) + +/* Ethernet Hardware Descriptor Header bits */ +#define EDH_EOWN BIT(7) +#define EDH_NPV BIT(8) +#define EDH_STICKY BIT(9) +#define _EDH_BCOUNT 0x07ff0000 +#define EDH_EOP BIT(30) +#define EDH_SOP BIT(31) +#define EDH_BCOUNT_SHIFT 16 +#define EDH_BCOUNT(len) ((len) << EDH_BCOUNT_SHIFT) + +/* Ethernet Hardware Descriptors + * ref: PIC32 Family Reference Manual Table 35-7 + * This structure represents the layout of the DMA + * memory shared between the CPU and the Ethernet + * controller. + */ +/* TX/RX DMA descriptor */ +struct eth_dma_desc { + u32 hdr; /* header */ + u32 data_buff; /* data buffer address */ + u32 stat1; /* transmit/receive packet status */ + u32 stat2; /* transmit/receive packet status */ + u32 next_ed; /* next descriptor */ +}; + +#define PIC32_MDIO_NAME "PIC32_EMAC" + +int pic32_mdio_init(const char *name, ulong ioaddr); + +#endif /* __MICROCHIP_PIC32_ETH_H_*/ diff --git a/drivers/net/pic32_mdio.c b/drivers/net/pic32_mdio.c new file mode 100644 index 0000000..578fc96 --- /dev/null +++ b/drivers/net/pic32_mdio.c @@ -0,0 +1,121 @@ +/* + * pic32_mdio.c: PIC32 MDIO/MII driver, part of pic32_eth.c. + * + * Copyright 2015 Microchip Inc. + * Purna Chandra Mandal purna.mandal@microchip.com + * + * SPDX-License-Identifier: GPL-2.0+ + */ +#include <common.h> +#include <phy.h> +#include <miiphy.h> +#include <errno.h> +#include <wait_bit.h> +#include <asm/io.h> +#include "pic32_eth.h" + +static int pic32_mdio_write(struct mii_dev *bus, + int addr, int dev_addr, + int reg, u16 value) +{ + u32 v; + struct pic32_mii_regs *mii_regs = bus->priv; + + /* Wait for the previous operation to finish */ + wait_for_bit(__func__, &mii_regs->mind.raw, MIIMIND_BUSY, + false, CONFIG_SYS_HZ, true); + + /* Put phyaddr and regaddr into MIIMADD */ + v = (addr << MIIMADD_PHYADDR_SHIFT) | (reg & MIIMADD_REGADDR); + writel(v, &mii_regs->madr.raw); + + /* Initiate a write command */ + writel(value, &mii_regs->mwtd.raw); + + /* Wait 30 clock cycles for busy flag to be set */ + udelay(12); + + /* Wait for write to complete */ + wait_for_bit(__func__, &mii_regs->mind.raw, MIIMIND_BUSY, + false, CONFIG_SYS_HZ, true); + + return 0; +} + +static int pic32_mdio_read(struct mii_dev *bus, int addr, int devaddr, int reg) +{ + u32 v; + struct pic32_mii_regs *mii_regs = bus->priv; + + /* Wait for the previous operation to finish */ + wait_for_bit(__func__, &mii_regs->mind.raw, MIIMIND_BUSY, + false, CONFIG_SYS_HZ, true); + + /* Put phyaddr and regaddr into MIIMADD */ + v = (addr << MIIMADD_PHYADDR_SHIFT) | (reg & MIIMADD_REGADDR); + writel(v, &mii_regs->madr.raw); + + /* Initiate a read command */ + writel(MIIMCMD_READ, &mii_regs->mcmd.raw); + + /* Wait 30 clock cycles for busy flag to be set */ + udelay(12); + + /* Wait for read to complete */ + wait_for_bit(__func__, &mii_regs->mind.raw, + MIIMIND_NOTVALID | MIIMIND_BUSY, + false, CONFIG_SYS_HZ, false); + + /* Clear the command register */ + writel(0, &mii_regs->mcmd.raw); + + /* Grab the value read from the PHY */ + v = readl(&mii_regs->mrdd.raw); + return v; +} + +static int pic32_mdio_reset(struct mii_dev *bus) +{ + struct pic32_mii_regs *mii_regs = bus->priv; + + /* Reset MII (due to new addresses) */ + writel(MIIMCFG_RSTMGMT, &mii_regs->mcfg.raw); + + /* Wait for the operation to finish */ + wait_for_bit(__func__, &mii_regs->mind.raw, MIIMIND_BUSY, + false, CONFIG_SYS_HZ, true); + + /* Clear reset bit */ + writel(0, &mii_regs->mcfg); + + /* Wait for the operation to finish */ + wait_for_bit(__func__, &mii_regs->mind.raw, MIIMIND_BUSY, + false, CONFIG_SYS_HZ, true); + + /* Set the MII Management Clock (MDC) - no faster than 2.5 MHz */ + writel(MIIMCFG_CLKSEL_DIV40, &mii_regs->mcfg.raw); + + /* Wait for the operation to finish */ + wait_for_bit(__func__, &mii_regs->mind.raw, MIIMIND_BUSY, + false, CONFIG_SYS_HZ, true); + return 0; +} + +int pic32_mdio_init(const char *name, ulong ioaddr) +{ + struct mii_dev *bus; + + bus = mdio_alloc(); + if (!bus) { + printf("Failed to allocate PIC32-MDIO bus\n"); + return -ENOMEM; + } + + bus->read = pic32_mdio_read; + bus->write = pic32_mdio_write; + bus->reset = pic32_mdio_reset; + strncpy(bus->name, name, sizeof(bus->name)); + bus->priv = (void *)ioaddr; + + return mdio_register(bus); +}